<?php

namespace App\Http\Controllers\Admin;

use App\Exports\StudentsExport;
use App\Imports\StudentsImport;
use App\Models\Course;
use App\Models\Student;
use App\Models\StudentCourse;
use App\Models\StudentCourseTeacher;
use App\Models\Teacher;
use App\Models\TeacherStudent;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Validator;
use Maatwebsite\Excel\Facades\Excel;

class StudentController extends Controller
{
    protected $redirect_index = '/admin/Student/index';

    protected $view_path = 'admin.students.';

    protected $pre_uri = '/admin/Student/';

    protected $model_name = '学员';

    protected $model;

    public function __construct()
    {
        parent::__construct();
        $this->model = new Student();
    }

    public function index(Request $request)
    {
        $list = $this->model->where('id', '>', 0)->orderBy('created_at', 'desc');

        if(!empty($request->input('keyword')) && !empty(trim($request->input('keyword')))) {
            $keyword = '%' . trim($request->input('keyword')) . '%';
            $list = $list->where('name', 'like', $keyword);
        }

        $list = $list->get();

        foreach($list as $item) {
            $tmp = $item->getCourseInfo();
            $item->course_name = $tmp['course_name'];
            $item->apply_date = $tmp['apply_date'];
            $item->end_date = $tmp['end_date'];
            $item->teacher_names = $tmp['teacher_names'];
        }

        if($request->has('sort_field') && $request->has('sort_field_by')) {
            if($request->input('sort_field_by') == 'asc') {
                $list = $list->sortBy($request->input('sort_field'));
            } else {
                $list = $list->sortByDesc($request->input('sort_field'));
            }
        }


        $list = $this->paginate($list);

        list($pre_uri, $model_name) = array($this->pre_uri, $this->model_name);
        return view($this->view_path . 'index', compact('list', 'pre_uri', 'model_name'));
    }

    public function create(Request $request)
    {
        list($pre_uri, $model_name, $model) = array($this->pre_uri, $this->model_name, $this->model);
        return view($this->view_path . 'create', compact('pre_uri', 'model_name', 'model', 'courses', 'teachers'));
    }

    public function store(Request $request)
    {
        if(!$request->isMethod('POST')) {
            return $this->showWarning('访问错误');
        }

        if(empty($request->input('data')) || !is_array($request->input('data'))) {
            return $this->showWarning('数据错误');
        }

        $validator = Validator::make($request->input('data'), [
            'phone' => 'required|unique:students'
        ], [
            'phone.required' => '手机必填',
            'phone.unique' => '手机已存在',
        ]);

        if($validator->fails()) {
            return back()->withErrors($validator)->withInput();
        }

        $res = $this->model->create($request->input('data'));

        if(!$res) {
            return $this->showWarning('数据库保存失败！');
        }
        return $this->showMessage('操作成功', $this->redirect_index);
    }

    public function edit(Request $request)
    {
        if(empty($request->input('id')) || empty($item = $this->model->find($request->input('id')))) {
            return $this->showWarning('数据错误！');
        }
        list($pre_uri, $model_name, $model) = array($this->pre_uri, $this->model_name, $this->model);

        return view($this->view_path . 'edit', compact('item','pre_uri', 'model_name', 'model'));
    }

    public function detail(Request $request)
    {
        if(empty($request->input('id')) || empty($item = $this->model->find($request->input('id')))) {
            return $this->showWarning('数据错误！');
        }
        list($pre_uri, $model_name, $model) = array($this->pre_uri, $this->model_name, $this->model);

        return view($this->view_path . 'detail', compact('item','pre_uri', 'model_name', 'model'));
    }

    public function update(Request $request)
    {
        if(!$request->isMethod('POST')) {
            return $this->showWarning('访问错误');
        }

        if(empty($request->input('id')) || empty($request->input('data')) || !is_array($request->input('data'))) {
            return $this->showWarning('数据错误');
        }

        $validator = Validator::make($request->input('data'), [
            'phone' => 'required'
        ], [
            'phone.required' => '手机必填'
        ]);

        if($validator->fails()) {
            return back()->withErrors($validator)->withInput();
        }

        $tmp = $this->model->where([
            ['id', '<>', $request->input('id')],
            ['phone', '=', $request->input('data')['phone']],
        ])->first();
        if(!empty($tmp)) {
            $validator->errors()->add('phone', '手机已存在!');
            return back()->withErrors($validator)->withInput();
        }

        $res = $this->model->where('id', $request->input('id'))->update($request->input('data'));

        if(!$res) {
            return $this->showWarning('数据库保存失败！');
        }
        return $this->showMessage('操作成功', $this->redirect_index);
    }

    public function delete(Request $request)
    {
        if(!$request->isMethod('POST')) {
            return $this->showWarning('访问错误');
        }
        if(empty($request->input('id')) || empty($item = $this->model->find($request->input('id')))) {
            return $this->showWarning('访问错误');
        }

        StudentCourse::where('student_id', $item->id)->delete();
        StudentCourseTeacher::where('student_id', $item->id)->delete();
        $res = $item->delete();
        if(!$res) {
            return $this->showWarning('数据库删除失败');
        }
        return $this->showMessage('操作成功');
    }
    
    public function export(Request $request)
    {
        return Excel::download(new StudentsExport(), '学员.xlsx');
    }

    public function import(Request $request)
    {
        if(!$request->has('file') || !$request->file('file')) {
            return $this->showWarning('请选择导入的文件');
        }

        Excel::import(new StudentsImport(), $request->file('file'));
        return $this->showMessage('操作成功');
    }
}