<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Maatwebsite\Excel\Facades\Excel;
use PhpOffice\PhpSpreadsheet\IOFactory;

class LoseRootController extends Controller
{
    //
    private $_row_unit = 1;
    private $_curriculum_six_id = 666;
    private $_curriculum_seven_id = 777;
    private $_curriculum_eight_id = 888;
    private $_curriculum_nine_id = 999;
    public function index_file()
    {
        return view("pages.home");
    }
    public function read_file(Request $request)
    {
        $file = $request->file('file_handle');
        // ĐỌC DỮ LIỆU TỪ FILE EXCEL
        $data_class_6 = $this->read_excel($file, "class_6"); // LỚP 6
        // $data_class_7 = $this->read_excel($file, "class_7"); // LỚP 7
        // $data_class_8 = $this->read_excel($file, "class_8"); // LỚP 8
        // $data_class_9 = $this->read_excel($file, "class_9"); // LỚP 9

        // TẠO LỘ TRÌNH LỚP
        $trip_loseroot = $this->create_trip_loseroot($data_class_6);
        // DỮ LIỆU ĐỂ ADD VÀO GIÁO TRÌNH (KEY = UNIT_ID)
        $generate = $this->generate_curriculum($data_class_6, $this->_curriculum_six_id);

        dd($generate);
    }
    public function create_trip_loseroot($data)
    {
        if (!empty($data)) {

        }
    }
    public function generate_curriculum($data, $curriculum_id)
    {
        $data_by_skill = [];
        $data_unit_topic = [];
        // sắp sếp lại các bài vào unit
        if (!empty($data)) {
            // gán từng unit thành skill
            foreach ($data as $num_week => $raw_data) {
                foreach ($raw_data as $key_raw => $value_raw) {
                    $data_by_skill[$key_raw][$num_week] = $value_raw;
                }
            }
        }
        if (!empty($data_by_skill)) {
            // gán các unit gồm các topic
            $week_unit_topic = [];
            foreach ($data_by_skill as $skill => $skill_raw) {
                foreach ($skill_raw as $week_num => $raw) {
                    array_walk($raw, function ($v, $k) use (&$week_unit_topic) {
                        $topic_id = (int) $v;
                        $week_unit_topic[$k][] = $topic_id;
                    });
                }
            }
            // lọc các topic cho vào bài
            if (!empty($week_unit_topic)) {
                foreach ($week_unit_topic as $week_number => $week_unit) {
                    $data_unit_topic[$week_number] = array_unique($week_unit);
                }
            }
        }
        return $data_unit_topic;
    }
    public function create_curriculum()
    {
        $data_curriculum = [
            'id' => $curriculum_id,
            'name' => null,
            'image_intro' => $curriculum_name,
            'author' => "Sunday English",
            'goal' => null,
            'description' => null,
            'category_id' => $curriculum_name,
            'status' => $curriculum_name,
            'created_at' => $curriculum_name,
            'created_by' => $curriculum_name,
            'updated_at' => $curriculum_name,
            'deleted' => $curriculum_name,
            'json_data_curriculum' => $curriculum_name,
            'updated_by' => $curriculum_name,
            'type' => $curriculum_name,
            'grade_id' => $curriculum_name,
            'curriculum_avatar' => $curriculum_name,
            'type_grade' => $curriculum_name,
            'allow_learning_free' => $curriculum_name,
            'curriculum_rootlessness' => $curriculum_name,
        ];
    }
    public function read_excel($file, $sheet_name)
    {
        $spreadsheet = IOFactory::load($file);
        $sheet = $spreadsheet->getSheetByName($sheet_name);
        $sheet = $spreadsheet->getActiveSheet();

        // Lấy tất cả dữ liệu từ sheet và chuyển đổi thành mảng
        $data = [];
        foreach ($sheet->getRowIterator() as $row) {
            $rowData = [];
            foreach ($row->getCellIterator() as $cell) {
                $value = $cell->getCalculatedValue();
                $rowData[] = trim($value);

            }
            if (!empty($rowData[0])) {
                $data[] = $rowData;
            }
        }
        $list_week_format = [];
        $row_unit = $data[$this->_row_unit];
        $list_unit = [];
        if (!empty($row_unit)) {
            foreach ($row_unit as $row_u) {
                if (is_numeric($row_u)) {
                    $list_unit[] = $row_u;
                }
            }
        }
        if (!empty($data)) {
            foreach ($data as $d_unit) {
                if (is_numeric($d_unit[0])) {
                    $week = $d_unit[0];
                    $skill = $d_unit[1];
                    unset($d_unit[0], $d_unit[1], $d_unit[2]);
                    $unit_id = 0;
                    $unit_topic = [];
                    foreach ($d_unit as $final_unit) {
                        if (!empty($final_unit)) {
                            $unit_id += 1;
                            $unit_topic[$unit_id] = $final_unit;
                        }
                    }
                    $list_week_format[$week][$skill] = $unit_topic;
                }
            }
        }
        return $list_week_format;
    }

}