<?php

namespace App\Controllers;

class Expenses extends Security_Controller {

    function __construct() {
        parent::__construct();

        $this->init_permission_checker("expense");

        $this->access_only_allowed_members();
    }

    //load the expenses list view
    function index() {
        $this->check_module_availability("module_expense");

        $view_data["custom_field_headers"] = $this->Custom_fields_model->get_custom_field_headers_for_table("expenses", $this->login_user->is_admin, $this->login_user->user_type);
        $view_data["custom_field_filters"] = $this->Custom_fields_model->get_custom_field_filters("expenses", $this->login_user->is_admin, $this->login_user->user_type);

        $view_data['categories_dropdown'] = $this->_get_categories_dropdown();
        $view_data['members_dropdown'] = $this->_get_team_members_dropdown();
        $view_data["projects_dropdown"] = $this->_get_projects_dropdown_for_income_and_expenses("expenses");

        return $this->template->rander("expenses/index", $view_data);
    }

    //get categories dropdown
    private function _get_categories_dropdown() {
        $categories = $this->Expense_categories_model->get_all_where(array("deleted" => 0), 0, 0, "title")->getResult();

        $categories_dropdown = array(array("id" => "", "text" => "- " . app_lang("category") . " -"));
        foreach ($categories as $category) {
            $categories_dropdown[] = array("id" => $category->id, "text" => $category->title);
        }

        return json_encode($categories_dropdown);
    }

    //get team members dropdown
    private function _get_team_members_dropdown() {
        $team_members = $this->Users_model->get_all_where(array("deleted" => 0, "user_type" => "staff"), 0, 0, "first_name")->getResult();

        $members_dropdown = array(array("id" => "", "text" => "- " . app_lang("member") . " -"));
        foreach ($team_members as $team_member) {
            $members_dropdown[] = array("id" => $team_member->id, "text" => $team_member->first_name . " " . $team_member->last_name);
        }

        return json_encode($members_dropdown);
    }

    //load the expenses list summary view
    function summary() {
        $this->check_module_availability("module_expense");

        return $this->template->rander("expenses/reports/expenses_summary");
    }

    //load the recurring view of expense list 
    function recurring() {
        return $this->template->view("expenses/recurring_expenses_list");
    }

    //load the add/edit expense form
    function modal_form() {
        $this->validate_submitted_data(array(
            "id" => "numeric"
        ));

        $client_id = $this->request->getPost('client_id');
        $project_id = $this->request->getPost('project_id');

        $model_info = $this->Expenses_model->get_one($this->request->getPost('id'));

        $model_info->project_id = $model_info->project_id ? $model_info->project_id : $this->request->getPost('project_id');
        $model_info->user_id = $model_info->user_id ? $model_info->user_id : $this->request->getPost('user_id');

        $view_data['categories_dropdown'] = $this->Expense_categories_model->get_dropdown_list(array("title"));
        $view_data['members_dropdown'] = $this->Users_model->get_dropdown_list_with_blank_option(array("first_name", "last_name"), "-", array("user_type" => "staff"));
        $view_data['clients_dropdown'] = null;

        $can_access_clients = $this->can_access_clients();

        if ($model_info->project_id && $can_access_clients) {
            //For project expense, show only the client of the project
            $project_info = $this->Projects_model->get_details(array("id" => $project_id))->getRow();
            if ($project_info->client_id) {
                $view_data['clients_dropdown'] = array(
                    array("id" => "", "text" => "-"),
                    array("id" => $project_info->client_id, "text" => $project_info->company_name)
                );
            }
        } else if ($can_access_clients) {
            $view_data['clients_dropdown'] = $this->Clients_model->get_id_and_text_dropdown(array("company_name"), array("is_lead" => 0), "-");
        }

        $view_data['projects_dropdown'] = $this->get_projects_dropdown(0, true);
        $view_data['taxes_dropdown'] = $this->Taxes_model->get_dropdown_list_with_blank_option(array("title"));

        $view_data['model_info'] = $model_info;
        $view_data['client_id'] = $client_id;
        $view_data['project_id'] = $project_id;

        //clone invoice
        $is_clone = $this->request->getPost('is_clone');
        $view_data['is_clone'] = $is_clone;

        $view_data["custom_fields"] = $this->Custom_fields_model->get_combined_details("expenses", $view_data['model_info']->id, $this->login_user->is_admin, $this->login_user->user_type)->getResult();
        return $this->template->view('expenses/modal_form', $view_data);
    }

    function get_projects_dropdown($client_id = 0, $return_as_list_data = false) {

        if (!$client_id) {
            $client_id = $this->request->getPost('expense_client_id');
        }

        validate_numeric_value($client_id);

        $options = array();
        if ($client_id) {
            $options["client_id"]  = $client_id;
        }

        $projects_dropdown = $this->Projects_model->get_id_and_text_dropdown(array("title"), $options, "-");

        if ($return_as_list_data) {
            return $projects_dropdown;
        } else {
            echo json_encode($projects_dropdown);
        }
    }


    //save an expense
    function save() {
        $this->validate_submitted_data(array(
            "id" => "numeric",
            "expense_date" => "required",
            "category_id" => "required",
            "amount" => "required"
        ));

        $id = $this->request->getPost('id');

        $target_path = get_setting("timeline_file_path");
        $files_data = move_files_from_temp_dir_to_permanent_dir($target_path, "expense");
        $new_files = unserialize($files_data);

        $recurring = $this->request->getPost('recurring') ? 1 : 0;
        $expense_date = $this->request->getPost('expense_date');
        $repeat_every = $this->request->getPost('repeat_every');
        $repeat_type = $this->request->getPost('repeat_type');
        $no_of_cycles = $this->request->getPost('no_of_cycles');

        $data = array(
            "expense_date" => $expense_date,
            "title" => $this->request->getPost('title'),
            "description" => $this->request->getPost('description'),
            "category_id" => $this->request->getPost('category_id'),
            "amount" => unformat_currency($this->request->getPost('amount')),
            "client_id" => $this->request->getPost('expense_client_id') ? $this->request->getPost('expense_client_id') : 0,
            "project_id" => $this->request->getPost('expense_project_id'),
            "user_id" => $this->request->getPost('expense_user_id'),
            "tax_id" => $this->request->getPost('tax_id') ? $this->request->getPost('tax_id') : 0,
            "tax_id2" => $this->request->getPost('tax_id2') ? $this->request->getPost('tax_id2') : 0,
            "recurring" => $recurring,
            "repeat_every" => $repeat_every ? $repeat_every : 0,
            "repeat_type" => $repeat_type ? $repeat_type : NULL,
            "no_of_cycles" => $no_of_cycles ? $no_of_cycles : 0,
        );

        $expense_info = $this->Expenses_model->get_one($id);

        //is editing? update the files if required
        if ($id) {
            $timeline_file_path = get_setting("timeline_file_path");
            $new_files = update_saved_files($timeline_file_path, $expense_info->files, $new_files);
        }


        $data["files"] = serialize($new_files);

        $is_clone = $this->request->getPost('is_clone');

        if ($is_clone && $id) {
            $id = "";
        }

        if ($recurring) {
            //set next recurring date for recurring expenses

            if ($id) {
                //update
                if ($this->request->getPost('next_recurring_date')) { //submitted any recurring date? set it.
                    $data['next_recurring_date'] = $this->request->getPost('next_recurring_date');
                } else {
                    //re-calculate the next recurring date, if any recurring fields has changed.
                    if ($expense_info->recurring != $data['recurring'] || $expense_info->repeat_every != $data['repeat_every'] || $expense_info->repeat_type != $data['repeat_type'] || $expense_info->expense_date != $data['expense_date']) {
                        $data['next_recurring_date'] = add_period_to_date($expense_date, $repeat_every, $repeat_type);
                    }
                }
            } else {
                //insert new
                $data['next_recurring_date'] = add_period_to_date($expense_date, $repeat_every, $repeat_type);
            }


            //recurring date must have to set a future date
            if (get_array_value($data, "next_recurring_date") && get_today_date() >= $data['next_recurring_date']) {
                echo json_encode(array("success" => false, 'message' => app_lang('past_recurring_date_error_message_title'), 'next_recurring_date_error' => app_lang('past_recurring_date_error_message'), "next_recurring_date_value" => $data['next_recurring_date']));
                return false;
            }
        }

        $data = clean_data($data);

        $save_id = $this->Expenses_model->ci_save($data, $id);
        if ($save_id) {
            save_custom_fields("expenses", $save_id, $this->login_user->is_admin, $this->login_user->user_type);

            echo json_encode(array("success" => true, "data" => $this->_row_data($save_id), 'id' => $save_id, 'message' => app_lang('record_saved')));
        } else {
            echo json_encode(array("success" => false, 'message' => app_lang('error_occurred')));
        }
    }

    //delete/undo an expense
    function delete() {
        $this->validate_submitted_data(array(
            "id" => "required|numeric"
        ));

        $id = $this->request->getPost('id');
        $expense_info = $this->Expenses_model->get_one($id);

        if ($this->Expenses_model->delete($id)) {
            //delete the files
            $file_path = get_setting("timeline_file_path");
            if ($expense_info->files) {
                $files = unserialize($expense_info->files);

                foreach ($files as $file) {
                    delete_app_files($file_path, array($file));
                }
            }

            echo json_encode(array("success" => true, 'message' => app_lang('record_deleted')));
        } else {
            echo json_encode(array("success" => false, 'message' => app_lang('record_cannot_be_deleted')));
        }
    }

    //get the expnese list data
    function list_data($recurring = false) {
        $start_date = $this->request->getPost('start_date');
        $end_date = $this->request->getPost('end_date');
        $category_id = $this->request->getPost('category_id');
        $project_id = $this->request->getPost('project_id');
        $user_id = $this->request->getPost('user_id');

        $custom_fields = $this->Custom_fields_model->get_available_fields_for_table("expenses", $this->login_user->is_admin, $this->login_user->user_type);

        $options = array("start_date" => $start_date, "end_date" => $end_date, "category_id" => $category_id, "project_id" => $project_id, "user_id" => $user_id, "custom_fields" => $custom_fields, "recurring" => $recurring, "custom_field_filter" => $this->prepare_custom_field_filter_values("expenses", $this->login_user->is_admin, $this->login_user->user_type));
        $list_data = $this->Expenses_model->get_details($options)->getResult();

        $result = array();
        foreach ($list_data as $data) {
            $result[] = $this->_make_row($data, $custom_fields);
        }
        echo json_encode(array("data" => $result));
    }

    //get a row of expnese list
    private function _row_data($id) {
        $custom_fields = $this->Custom_fields_model->get_available_fields_for_table("expenses", $this->login_user->is_admin, $this->login_user->user_type);
        $options = array("id" => $id, "custom_fields" => $custom_fields);
        $data = $this->Expenses_model->get_details($options)->getRow();
        return $this->_make_row($data, $custom_fields);
    }

    //prepare a row of expnese list
    private function _make_row($data, $custom_fields) {

        $description = $data->description;
        if ($data->linked_client_name) {
            if ($description) {
                $description .= "<br />";
            }
            $description .= app_lang("client") . ": " . $data->linked_client_name;
        }

        if ($data->project_title) {
            if ($description) {
                $description .= "<br /> ";
            }
            $description .= app_lang("project") . ": " . $data->project_title;
        }

        if ($data->linked_user_name) {
            if ($description) {
                $description .= "<br /> ";
            }
            $description .= app_lang("team_member") . ": " . $data->linked_user_name;
        }

        if ($data->recurring) {
            //show recurring information
            $recurring_stopped = false;
            $recurring_cycle_class = "";
            if ($data->no_of_cycles_completed > 0 && $data->no_of_cycles_completed == $data->no_of_cycles) {
                $recurring_cycle_class = "text-danger";
                $recurring_stopped = true;
            }

            $cycles = $data->no_of_cycles_completed . "/" . $data->no_of_cycles;
            if (!$data->no_of_cycles) { //if not no of cycles, so it's infinity
                $cycles = $data->no_of_cycles_completed . "/&#8734;";
            }

            if ($description) {
                $description .= "<br /> ";
            }

            $description .= app_lang("repeat_every") . ": " . $data->repeat_every . " " . app_lang("interval_" . $data->repeat_type);
            $description .= "<br /> ";
            $description .= "<span class='$recurring_cycle_class'>" . app_lang("cycles") . ": " . $cycles . "</span>";

            if (!$recurring_stopped && (int) $data->next_recurring_date) {
                $description .= "<br /> ";
                $description .= app_lang("next_recurring_date") . ": " . format_to_date($data->next_recurring_date, false);
            }
        }

        if ($data->recurring_expense_id) {
            if ($description) {
                $description .= "<br /> ";
            }
            $description .= modal_anchor(get_uri("expenses/expense_details"), app_lang("original_expense"), array("title" => app_lang("expense_details"), "data-post-id" => $data->recurring_expense_id));
        }

        $files_link = "";
        $file_download_link = "";
        if ($data->files) {
            $files = unserialize($data->files);
            if (count($files)) {
                foreach ($files as $key => $value) {
                    $file_name = get_array_value($value, "file_name");
                    $link = get_file_icon(strtolower(pathinfo($file_name, PATHINFO_EXTENSION)));
                    $file_download_link = anchor(get_uri("expenses/download_files/" . $data->id), "<i data-feather='download'></i>", array("title" => app_lang("download")));
                    $files_link .= js_anchor("<i data-feather='$link'></i>", array('title' => "", "data-toggle" => "app-modal", "data-sidebar" => "0", "class" => "float-start mr10", "title" => remove_file_prefix($file_name), "data-url" => get_uri("expenses/file_preview/" . $data->id . "/" . $key)));
                }
            }
        }

        $tax = 0;
        $tax2 = 0;
        if ($data->tax_percentage) {
            $tax = $data->amount * ($data->tax_percentage / 100);
        }
        if ($data->tax_percentage2) {
            $tax2 = $data->amount * ($data->tax_percentage2 / 100);
        }

        $row_data = array(
            $data->expense_date,
            modal_anchor(get_uri("expenses/expense_details"), format_to_date($data->expense_date, false), array("title" => app_lang("expense_details"), "data-post-id" => $data->id, "data-modal-lg" => "1")),
            $data->category_title,
            $data->title,
            $description,
            $files_link . $file_download_link,
            to_currency($data->amount),
            to_currency($tax),
            to_currency($tax2),
            to_currency($data->amount + $tax + $tax2)
        );

        foreach ($custom_fields as $field) {
            $cf_id = "cfv_" . $field->id;
            $row_data[] = $this->template->view("custom_fields/output_" . $field->field_type, array("value" => $data->$cf_id));
        }

        $row_data[] = modal_anchor(get_uri("expenses/modal_form"), "<i data-feather='edit' class='icon-16'></i>", array("class" => "edit", "title" => app_lang('edit_expense'), "data-post-id" => $data->id))
            . js_anchor("<i data-feather='x' class='icon-16'></i>", array('title' => app_lang('delete_expense'), "class" => "delete", "data-id" => $data->id, "data-action-url" => get_uri("expenses/delete"), "data-action" => "delete-confirmation"));

        return $row_data;
    }

    function file_preview($id = "", $key = "") {
        validate_numeric_value($id);
        if ($id) {
            $expense_info = $this->Expenses_model->get_one($id);
            $files = unserialize($expense_info->files);
            $file = get_array_value($files, $key);

            $file_name = get_array_value($file, "file_name");
            $file_id = get_array_value($file, "file_id");
            $service_type = get_array_value($file, "service_type");

            $view_data["file_url"] = get_source_url_of_file($file, get_setting("timeline_file_path"));
            $view_data["is_image_file"] = is_image_file($file_name);
            $view_data["is_iframe_preview_available"] = is_iframe_preview_available($file_name);
            $view_data["is_google_preview_available"] = is_google_preview_available($file_name);
            $view_data["is_viewable_video_file"] = is_viewable_video_file($file_name);
            $view_data["is_google_drive_file"] = ($file_id && $service_type == "google") ? true : false;
            $view_data["is_iframe_preview_available"] = is_iframe_preview_available($file_name);

            return $this->template->view("expenses/file_preview", $view_data);
        } else {
            show_404();
        }
    }

    //load the expenses yearly chart view
    function yearly_chart() {
        return $this->template->view("expenses/reports/yearly_chart");
    }

    function yearly_chart_data() {

        $months = array("january", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december");

        $year = $this->request->getPost("year");
        if ($year) {
            $expenses = $this->Expenses_model->get_yearly_expenses_chart($year);
            $values = array();
            foreach ($expenses as $value) {
                $values[$value->month - 1] = $value->total; //in array the month january(1) = index(0)
            }

            foreach ($months as $key => $month) {
                $value = get_array_value($values, $key);
                $short_months[] = app_lang("short_" . $month);
                $data[] = $value ? $value : 0;
            }

            echo json_encode(array("months" => $short_months, "data" => $data));
        }
    }

    function income_vs_expenses() {
        $view_data["projects_dropdown"] = $this->_get_projects_dropdown_for_income_and_expenses();
        return $this->template->rander("expenses/reports/income_vs_expenses_chart", $view_data);
    }

    function income_vs_expenses_chart_data() {

        $year = $this->request->getPost("year");
        $project_id = $this->request->getPost("project_id");
        validate_numeric_value($year);
        validate_numeric_value($project_id);

        if ($year) {
            $expenses_data = $this->Expenses_model->get_yearly_expenses_chart($year, $project_id);
            $payments_data = $this->Invoice_payments_model->get_yearly_payments_chart($year, "", $project_id);

            $payments = array();

            $expenses = array();

            for ($i = 1; $i <= 12; $i++) {
                $payments[$i] = 0;
                $expenses[$i] = 0;
            }

            foreach ($payments_data as $payment) {
                $payments[$payment->month] = $payments[$payment->month] + get_converted_amount($payment->currency, $payment->total);
            }
            foreach ($expenses_data as $expense) {
                $expenses[$expense->month] = $expense->total;
            }

            foreach ($payments as $payment) {
                $payments_array[] = $payment;
            }

            foreach ($expenses as $expense) {
                $expenses_array[] = $expense;
            }

            echo json_encode(array("income" => $payments_array, "expenses" => $expenses_array));
        }
    }

    function income_vs_expenses_summary() {
        $view_data["projects_dropdown"] = $this->_get_projects_dropdown_for_income_and_expenses();
        return $this->template->view("expenses/reports/income_vs_expenses_summary", $view_data);
    }

    function income_vs_expenses_summary_list_data() {

        $year = explode("-", $this->request->getPost("start_date"));
        $project_id = $this->request->getPost("project_id");
        validate_numeric_value($project_id);

        if ($year) {
            $expenses_data = $this->Expenses_model->get_yearly_expenses_chart($year[0], $project_id);
            $payments_data = $this->Invoice_payments_model->get_yearly_payments_chart($year[0], "", $project_id);

            $payments = array();
            $expenses = array();

            for ($i = 1; $i <= 12; $i++) {
                $payments[$i] = 0;
                $expenses[$i] = 0;
            }

            foreach ($payments_data as $payment) {
                $payments[$payment->month] = $payments[$payment->month] + get_converted_amount($payment->currency, $payment->total);
            }
            foreach ($expenses_data as $expense) {
                $expenses[$expense->month] = $expense->total;
            }

            //get the list of summary
            $result = array();
            for ($i = 1; $i <= 12; $i++) {
                $result[] = $this->_row_data_of_summary($i, $payments[$i], $expenses[$i]);
            }

            echo json_encode(array("data" => $result));
        }
    }

    //get the row of summary
    private function _row_data_of_summary($month_index, $payments, $expenses) {
        //get the month name
        $month_array = array(" ", "january", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december");

        $month = get_array_value($month_array, $month_index);

        $month_name = app_lang($month);
        $profit = $payments - $expenses;

        return array(
            $month_index,
            $month_name,
            to_currency($payments),
            to_currency($expenses),
            to_currency($profit)
        );
    }

    /* list of expense of a specific client, prepared for datatable  */

    function expense_list_data_of_client($client_id) {
        $this->access_only_team_members();
        validate_numeric_value($client_id);

        $custom_fields = $this->Custom_fields_model->get_available_fields_for_table("expenses", $this->login_user->is_admin, $this->login_user->user_type);

        $options = array(
            "client_id" => $client_id,
            "custom_fields" => $custom_fields,
            "custom_field_filter" => $this->prepare_custom_field_filter_values("expenses", $this->login_user->is_admin, $this->login_user->user_type)
        );

        $list_data = $this->Expenses_model->get_details($options)->getResult();
        $result = array();
        foreach ($list_data as $data) {
            $result[] = $this->_make_row($data, $custom_fields);
        }
        echo json_encode(array("data" => $result));
    }

    function expense_details() {
        $this->validate_submitted_data(array(
            "id" => "required|numeric"
        ));

        $expense_id = $this->request->getPost('id');
        $options = array("id" => $expense_id);
        $info = $this->Expenses_model->get_details($options)->getRow();
        if (!$info) {
            show_404();
        }

        $view_data["expense_info"] = $info;
        $view_data['custom_fields_list'] = $this->Custom_fields_model->get_combined_details("expenses", $expense_id, $this->login_user->is_admin, $this->login_user->user_type)->getResult();

        return $this->template->view("expenses/expense_details", $view_data);
    }

    //get the expneses summary list data
    function summary_list_data() {
        $start_date = $this->request->getPost('start_date');
        $end_date = $this->request->getPost('end_date');

        $options = array("start_date" => $start_date, "end_date" => $end_date);
        $list_data = $this->Expenses_model->get_summary_details($options)->getResult();

        $result = array();
        foreach ($list_data as $data) {
            $result[] = array(
                $data->category_title,
                to_currency($data->amount),
                to_currency($data->tax),
                to_currency($data->tax2),
                to_currency($data->amount + $data->tax + $data->tax2)
            );
        }

        echo json_encode(array("data" => $result));
    }

    /* download files */

    function download_files($id) {
        validate_numeric_value($id);

        $files = $this->Expenses_model->get_one($id)->files;
        return $this->download_app_files(get_setting("timeline_file_path"), $files);
    }

    function import_expenses_modal_form() {
        return $this->template->view("expenses/import_expenses_modal_form");
    }

    function download_sample_excel_file() {
        return $this->download_app_files(get_setting("system_file_path"), serialize(array(array("file_name" => "import-expenses-sample.xlsx"))));
    }

    function validate_import_expenses_file() {
        $file_name = $this->request->getPost("file_name");
        $file_ext = strtolower(pathinfo($file_name, PATHINFO_EXTENSION));
        if (!is_valid_file_to_upload($file_name)) {
            echo json_encode(array("success" => false, 'message' => app_lang('invalid_file_type')));
            exit();
        }

        if ($file_ext == "xlsx") {
            echo json_encode(array("success" => true));
        } else {
            echo json_encode(array("success" => false, 'message' => app_lang('please_upload_a_excel_file') . " (.xlsx)"));
        }
    }

    private function _prepare_expense_data($data_row, $allowed_headers) {
        //prepare expense data
        $expense_data = array();
        $custom_field_values_array = array();

        foreach ($data_row as $row_data_key => $row_data_value) { //row values
            if (!$row_data_value) {
                continue;
            }

            $header_key_value = get_array_value($allowed_headers, $row_data_key);
            if (strpos($header_key_value, 'cf') !== false) { //custom field
                $explode_header_key_value = explode("-", $header_key_value);
                $custom_field_id = get_array_value($explode_header_key_value, 1);

                //modify date value
                $custom_field_info = $this->Custom_fields_model->get_one($custom_field_id);
                if ($custom_field_info->field_type === "date") {
                    $row_data_value = $this->_check_valid_date($row_data_value);
                }

                $custom_field_values_array[$custom_field_id] = $row_data_value;
            } else if ($header_key_value == "category") {
                $expense_data["category_id"] = $this->_get_category_id($row_data_value);
            } else if ($header_key_value == "project") {
                $expense_data["project_id"] = $this->_get_project_id($row_data_value);
            } else if ($header_key_value == "amount") {
                $expense_data["amount"] = unformat_currency($row_data_value);
            } else if ($header_key_value == "team_member") {
                $expense_data["user_id"] = $this->_get_user_id($row_data_value);
            } else if ($header_key_value == "client") {
                $expense_data["client_id"] = $this->_get_client_id($row_data_value);
            } else if ($header_key_value == "tax") {
                $expense_data["tax_id"] = $this->_get_tax_id($row_data_value);
            } else if ($header_key_value == "second_tax") {
                $expense_data["tax_id2"] = $this->_get_tax_id($row_data_value);
            } else if ($header_key_value == "date") {
                $expense_data["expense_date"] = $this->_check_valid_date($row_data_value);
            } else {
                $expense_data[$header_key_value] = $row_data_value;
            }
        }

        return array(
            "expense_data" => $expense_data,
            "custom_field_values_array" => $custom_field_values_array
        );
    }

    private function _get_existing_custom_field_id($title = "") {
        if (!$title) {
            return false;
        }

        $custom_field_data = array(
            "title" => $title,
            "related_to" => "expenses"
        );

        $existing = $this->Custom_fields_model->get_one_where(array_merge($custom_field_data, array("deleted" => 0)));
        if ($existing->id) {
            return $existing->id;
        }
    }

    private function _prepare_headers_for_submit($headers_row, $headers) {
        foreach ($headers_row as $key => $header) {
            if (!((count($headers) - 1) < $key)) { //skip default headers
                continue;
            }

            //so, it's a custom field
            //check if there is any custom field existing with the title
            //add id like cf-3
            $existing_id = $this->_get_existing_custom_field_id($header);
            if ($existing_id) {
                array_push($headers, "cf-$existing_id");
            }
        }

        return $headers;
    }

    function save_expense_from_excel_file() {
        if (!$this->validate_import_expenses_file_data(true)) {
            echo json_encode(array('success' => false, 'message' => app_lang('error_occurred')));
        }

        $file_name = $this->request->getPost('file_name');
        require_once(APPPATH . "ThirdParty/PHPOffice-PhpSpreadsheet/vendor/autoload.php");

        $temp_file_path = get_setting("temp_file_path");
        $excel_file = \PhpOffice\PhpSpreadsheet\IOFactory::load($temp_file_path . $file_name);
        $excel_file = $excel_file->getActiveSheet()->toArray();
        $allowed_headers = $this->_get_allowed_headers();
        $now = get_current_utc_time();

        foreach ($excel_file as $key => $value) { //rows
            if ($key === 0) { //first line is headers, modify this for custom fields and continue for the next loop
                $allowed_headers = $this->_prepare_headers_for_submit($value, $allowed_headers);
                continue;
            }

            $expense_data_array = $this->_prepare_expense_data($value, $allowed_headers);
            $expense_data = get_array_value($expense_data_array, "expense_data");
            $custom_field_values_array = get_array_value($expense_data_array, "custom_field_values_array");

            //couldn't prepare valid data
            if (!($expense_data && count($expense_data))) {
                continue;
            }

            //save expense data
            $expense_save_id = $this->Expenses_model->ci_save($expense_data);
            if (!$expense_save_id) {
                continue;
            }

            //save custom fields
            $this->_save_custom_fields_of_expense($expense_save_id, $custom_field_values_array);
        }

        delete_file_from_directory($temp_file_path . $file_name); //delete temp file

        echo json_encode(array('success' => true, 'message' => app_lang("record_saved")));
    }

    private function _save_custom_fields_of_expense($expense_id, $custom_field_values_array) {
        if (!$custom_field_values_array) {
            return false;
        }

        foreach ($custom_field_values_array as $key => $custom_field_value) {
            $field_value_data = array(
                "related_to_type" => "expenses",
                "related_to_id" => $expense_id,
                "custom_field_id" => $key,
                "value" => $custom_field_value
            );

            $field_value_data = clean_data($field_value_data);

            $this->Custom_field_values_model->ci_save($field_value_data);
        }
    }

    private function _get_category_id($category = "") {
        if (!$category) {
            return false;
        }

        $existing_category = $this->Expense_categories_model->get_one_where(array("title" => $category, "deleted" => 0));
        if ($existing_category->id) {
            //item category exists, add the category id
            return $existing_category->id;
        } else {
            //item category doesn't exists, create a new one and add category id
            $category_data = array("title" => $category);
            return $this->Expense_categories_model->ci_save($category_data);
        }
    }

    private function _get_project_id($project = "") {
        if (!$project) {
            return false;
        }

        $existing_project = $this->Projects_model->get_one_where(array("title" => $project, "deleted" => 0));
        if ($existing_project->id) {
            return $existing_project->id;
        } else {
            return false;
        }
    }

    private function _get_user_id($user = "") {
        $user = trim($user);
        if (!$user) {
            return false;
        }

        $existing_user = $this->Users_model->get_user_from_full_name($user);
        if ($existing_user) {
            return $existing_user->id;
        } else {
            return false;
        }
    }

    private function _get_client_id($client = "") {
        if (!$client) {
            return false;
        }

        $existing_client = $this->Clients_model->get_one_where(array("company_name" => $client, "is_lead" => 0, "deleted" => 0));
        if ($existing_client->id) {
            return $existing_client->id;
        } else {
            return false;
        }
    }

    private function _get_tax_id($tax = "") {
        if (!$tax) {
            return false;
        }

        $existing_tax = $this->Taxes_model->get_one_where(array("percentage" => $tax, "deleted" => 0));
        if ($existing_tax->id) {
            return $existing_tax->id;
        } else {
            return false;
        }
    }

    private function _get_allowed_headers() {
        return array(
            "date",
            "category",
            "title",
            "description",
            "amount",
            "project",
            "team_member",
            "client",
            "tax",
            "second_tax"
        );
    }

    private function _store_headers_position($headers_row = array()) {
        $allowed_headers = $this->_get_allowed_headers();

        //check if all headers are correct and on the right position
        $final_headers = array();
        foreach ($headers_row as $key => $header) {
            if (!$header) {
                continue;
            }

            $key_value = str_replace(' ', '_', strtolower(trim($header, " ")));
            $header_on_this_position = get_array_value($allowed_headers, $key);
            $header_array = array("key_value" => $header_on_this_position, "value" => $header);

            if ($header_on_this_position == $key_value) {
                //allowed headers
                //the required headers should be on the correct positions
                //pushed header at last of this loop
            } else if (((count($allowed_headers) - 1) < $key) && $key_value) {
                //custom fields headers
                //check if there is any existing custom field with this title
                $existing_id = $this->_get_existing_custom_field_id(trim($header, " "));
                if ($existing_id) {
                    $header_array["custom_field_id"] = $existing_id;
                } else {
                    $header_array["has_error"] = true;
                    $header_array["custom_field"] = true;
                }
            } else {
                //invalid header, flag as red
                $header_array["has_error"] = true;
            }

            if ($key_value) {
                array_push($final_headers, $header_array);
            }
        }

        return $final_headers;
    }

    function validate_import_expenses_file_data($check_on_submit = false) {
        $table_data = "";
        $error_message = "";
        $headers = array();
        $got_error_header = false; //we've to check the valid headers first, and a single header at a time
        $got_error_table_data = false;

        $file_name = $this->request->getPost("file_name");

        require_once(APPPATH . "ThirdParty/PHPOffice-PhpSpreadsheet/vendor/autoload.php");

        $temp_file_path = get_setting("temp_file_path");
        $excel_file = \PhpOffice\PhpSpreadsheet\IOFactory::load($temp_file_path . $file_name);
        $excel_file = $excel_file->getActiveSheet()->toArray();

        $table_data .= '<table class="table table-responsive table-bordered table-hover" style="width: 100%; color: #444;">';

        $table_data_header_array = array();
        $table_data_body_array = array();

        foreach ($excel_file as $row_key => $value) {
            if ($row_key == 0) { //validate headers
                $headers = $this->_store_headers_position($value);

                foreach ($headers as $row_data) {
                    $has_error_class = false;
                    if (get_array_value($row_data, "has_error") && !$got_error_header) {
                        $has_error_class = true;
                        $got_error_header = true;

                        if (get_array_value($row_data, "custom_field")) {
                            $error_message = app_lang("no_such_custom_field_found");
                        } else {
                            $error_message = sprintf(app_lang("import_client_error_header"), app_lang(get_array_value($row_data, "key_value")));
                        }
                    }

                    array_push($table_data_header_array, array("has_error_class" => $has_error_class, "value" => get_array_value($row_data, "value")));
                }
            } else { //validate data
                if (!array_filter($value)) {
                    continue;
                }

                $error_message_on_this_row = "<ol class='pl15'>";

                foreach ($value as $key => $row_data) {
                    $has_error_class = false;

                    if (!$got_error_header) {
                        $row_data_validation = $this->_row_data_validation_and_get_error_message($key, $row_data, $headers);
                        if ($row_data_validation) {
                            $has_error_class = true;
                            $error_message_on_this_row .= "<li>" . $row_data_validation . "</li>";
                            $got_error_table_data = true;
                        }
                    }

                    if (count($headers) > $key) {
                        $table_data_body_array[$row_key][] = array("has_error_class" => $has_error_class, "value" => $row_data);
                    }
                }

                $error_message_on_this_row .= "</ol>";

                //error messages for this row
                if ($got_error_table_data) {
                    $table_data_body_array[$row_key][] = array("has_error_text" => true, "value" => $error_message_on_this_row);
                }
            }
        }

        //return false if any error found on submitting file
        if ($check_on_submit) {
            return ($got_error_header || $got_error_table_data) ? false : true;
        }

        //add error header if there is any error in table body
        if ($got_error_table_data) {
            array_push($table_data_header_array, array("has_error_text" => true, "value" => app_lang("error")));
        }

        //add headers to table
        $table_data .= "<tr>";
        foreach ($table_data_header_array as $table_data_header) {
            $error_class = get_array_value($table_data_header, "has_error_class") ? "error" : "";
            $error_text = get_array_value($table_data_header, "has_error_text") ? "text-danger" : "";
            $value = get_array_value($table_data_header, "value");
            $table_data .= "<th class='$error_class $error_text'>" . $value . "</th>";
        }
        $table_data .= "</tr>";

        //add body data to table
        foreach ($table_data_body_array as $table_data_body_row) {
            $table_data .= "<tr>";
            $error_text = "";

            foreach ($table_data_body_row as $table_data_body_row_data) {
                $error_class = get_array_value($table_data_body_row_data, "has_error_class") ? "error" : "";
                $error_text = get_array_value($table_data_body_row_data, "has_error_text") ? "text-danger" : "";
                $value = get_array_value($table_data_body_row_data, "value");
                $table_data .= "<td class='$error_class $error_text'>" . $value . "</td>";
            }

            if ($got_error_table_data && !$error_text) {
                $table_data .= "<td></td>";
            }

            $table_data .= "</tr>";
        }

        //add error message for header
        if ($error_message) {
            $total_columns = count($table_data_header_array);
            $table_data .= "<tr><td class='text-danger' colspan='$total_columns'><i data-feather='alert-triangle' class='icon-16'></i> " . $error_message . "</td></tr>";
        }

        $table_data .= "</table>";

        echo json_encode(array("success" => true, 'table_data' => $table_data, 'got_error' => ($got_error_header || $got_error_table_data) ? true : false));
    }

    private function _row_data_validation_and_get_error_message($key, $data, $headers = array()) {
        $allowed_headers = $this->_get_allowed_headers();
        $header_value = get_array_value($allowed_headers, $key);

        //check required fields
        if (($header_value == "date" && !$data) || ($header_value == "category" && !$data) || ($header_value == "amount" && !$data)) {
            return sprintf(app_lang("import_error_field_required"), app_lang($header_value));
        }

        //check dates
        if ($header_value == "date" && !$this->_check_valid_date($data)) {
            return app_lang("import_date_error_message");
        }

        //check existance
        if ($data && (
            ($header_value == "project" && !$this->_get_project_id($data)) ||
            ($header_value == "client" && !$this->_get_client_id($data)) ||
            ($header_value == "team_member" && !$this->_get_user_id($data)) ||
            (($header_value == "tax" || $header_value == "second_tax") && !$this->_get_tax_id($data))
        )) {
            return sprintf(app_lang("import_not_exists_error_message"), app_lang($header_value));
        }

        //there has no date field on default import fields
        //check on custom fields
        if (((count($allowed_headers) - 1) < $key) && $data) {
            $header_info = get_array_value($headers, $key);
            $custom_field_info = $this->Custom_fields_model->get_one(get_array_value($header_info, "custom_field_id"));
            if ($custom_field_info->field_type === "date" && !$this->_check_valid_date($data)) {
                return app_lang("import_date_error_message");
            }
        }
    }

    /* load tasks tab  */

    function tasks($expense_id) {
        validate_numeric_value($expense_id);
        $view_data["custom_field_headers_of_task"] = $this->Custom_fields_model->get_custom_field_headers_for_table("tasks", $this->login_user->is_admin, $this->login_user->user_type);

        $view_data['expense_id'] = clean_data($expense_id);
        return $this->template->view("expenses/tasks/index", $view_data);
    }

    //load the expenses monthly summary view
    function monthly_summary() {
        return $this->template->view("expenses/reports/monthly_summary");
    }

    //load the expenses custom summary view
    function custom_summary() {
        return $this->template->view("expenses/reports/custom_summary");
    }

    //load the expenses category chart view
    function category_chart() {
        return $this->template->view("expenses/reports/category_chart_container");
    }

    function category_chart_view() {
        $start_date = $this->request->getPost('start_date');
        $end_date = $this->request->getPost('end_date');

        $options = array("start_date" => $start_date, "end_date" => $end_date);

        $categories_data = $this->Expenses_model->get_summary_details($options)->getResult();
        $category_title = array();
        $category_value = array();

        foreach ($categories_data as $category_data) {
            $category_title[] = $category_data->category_title;
            $category_value[] = $category_data->amount + $category_data->tax + $category_data->tax2;
        }

        $view_data["label"] = $category_title;
        $view_data["data"] = $category_value;


        return $this->template->view("expenses/reports/category_chart", $view_data);
    }
}

/* End of file expenses.php */
/* Location: ./app/controllers/expenses.php */