<?php

namespace App\Http\Controllers;

use App\Http\Resources\MasterTaskResource;
use App\Models\Attachment;
use App\Models\MasterTask;
use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

class MasterTaskController extends Controller
{
    public function index(Request $request)
    {
        // get query parameter from request
        $parameters = $request->query();

        $mastertasks = MasterTask::select('*');

        // filtrovanie na zaklade parametrov
        foreach ( $parameters as $field => $value ) {
            if (!$value) continue;

            switch ($field) {
                case 'created_at':
                    $mastertasks->where($field, 'like', '%-' . $value . '-%');
                    break;

                case 'employee_id':
                    $mastertasks->whereHas('subtasks', function ($query) use ($value) {
                        $query->where('user_id', $value);
                    });
                    break;

                default:
                    $mastertasks->where($field, $value);
                    break;
            }
        }

        $mastertasks = $mastertasks->get();

        return response()->json([
            'mastertasks' => MasterTaskResource::collection($mastertasks)
        ], 200);
    }

    public function store(Request $request)
    {
        $created_by = User::getUserIdFromBearerToken($request->bearerToken());

        $validator = Validator::make($request->all(), [
            'data.name' => 'required',
            'data.description' => 'required',
            'data.duration' => 'required',
            'data.deadline' => 'required',
            'data.project_id' => 'required',
            'data.employees' => 'required',
            'data.files' => 'max:51200',
        ],
        ['data.files.max' => 'File size must be less than 50MB']);

        if($validator->fails()){
            return response()->json($validator->errors(), 400);
        }

        // validacia na max 50MB size pre attachmenty. neslo dat do klasickeho laravel validation, tak je to separe

        if ($files = $request->file('data')['files']) {
            foreach ( $files as $file ) {
                if ($file->getSize() > 52428800)
                    return response()->json([
                        'files' => 'File size must be less than 50MB',
                    ], 400);
            }
        }


        // upratanie requestu, pretoze frontend pouziva inu nomenklaturu fieldov ako appka
        $data['data'] = $request->all()['data'];
        $data['data']['title'] = $request->all()['data']['name'];
        $data['data']['estimated_time'] = $request->all()['data']['duration'];
        $data['data']['created_by'] = $created_by;

        foreach ( $data['data']['employees'] as $key => $employee ) {
            $data['data']['employees'][$key]['user_id'] = $employee['id'];
            $data['data']['employees'][$key]['estimated_time'] = $employee['duration'];
            $data['data']['employees'][$key]['created_by'] = $created_by;
        }

        $request->merge($data);

        $mastertask = MasterTask::create($request->all()['data']);
        $mastertask->subtasks()->createMany($request->all()['data']['employees']);

        // upload attachmentu
        if ($request->file('data')) {
            $attachments = Attachment::uploadAttachmentsToS3($request->file('data')['files'], $mastertask);
            $mastertask->attachments()->createMany($attachments);
        }

        return response()->json([
            'message' => 'Master Task created successfully',
            'mastertask' => $mastertask
        ], 201);
    }

    public function update($id, Request $request)
    {
        $validator = Validator::make($request->all(), [
            'data.name' => 'required',
            'data.description' => 'required',
            'data.duration' => 'required',
            'data.deadline' => 'required',
            'data.project_id' => 'required',
            'data.file' => 'max:51200',
        ],
            ['data.file.max' => 'File size must be less than 50MB']);

        if ($validator->fails()){
            return response()->json($validator->errors(), 400);
        }

        // upratanie requestu, pretoze frontend pouziva inu nomenklaturu fieldov ako appka
        $data['data'] = $request->all()['data'];
        $data['data']['title'] = $request->all()['data']['name'];
        $data['data']['estimated_time'] = $request->all()['data']['duration'];

        $request->merge($data);

        $mastertask = MasterTask::find($id);

        // ak je Master task v stave ukončený, nedovolime update. vynimkou je iba znovuotvorenie mastertasku
        if ($mastertask->is_finished == 1 && isset($request->all()['data']['is_finished']) && $request->all()['data']['is_finished'] == 1) {
            return response()->json([
                'message' => 'Cannot update mastertask with is_finished 1.',
            ], 400);
        }

        // ak chcem ukoncit mastertask, ktory nema ani jeden subtask, ktory ma natrackovany cas, tak to nedovolim
        if (isset($request->all()['data']['is_finished']) && $request->all()['data']['is_finished'] == 1) {
            $atLeastOneSubtaskHasTimesheet = false;

            foreach ($mastertask->subtasks as $subtask) {
                if ($subtask->timesheets()->exists()) {
                    $atLeastOneSubtaskHasTimesheet = true;
                }
            }

            if (!$atLeastOneSubtaskHasTimesheet)
                return response()->json([
                    'message' => 'Finishing mastertask is only possible where at least one subtask contains timesheet',
                ], 400);
        }

        $mastertask->update($request->all()['data']);

        // upload attachmentu

        // TODO prerobit na upsert
        if ($request->file('data')) {
            $attachments = Attachment::uploadAttachmentsToS3($request->file('data')['files'], $mastertask);
            $mastertask->attachments()->createMany($attachments);
        }

        return response()->json([
            'message' => 'Master Task updated successfully',
            'mastertask' => $mastertask
        ]);


        // TODO V prípade, že sa menil zodpovedný team - Pre prebiehajúce sub tasky  - Ukončia sa sub tasky pôvodného teamu a tie sa následne zarátajú do ERP Karat

        // TODO V prípade, že sa menil zodpovedný team - Pre nové sub tasky (s nenatrackovaným časom) budú tieto tasky zmazané

    }

    public function delete($id)
    {
        $mastertask = MasterTask::find($id);

        // nedovolit zmazanie mastertasku, ak existuje aspon jeden subtask s timesheetom
        foreach ($mastertask->subtasks as $subtask) {
            if ($subtask->timesheets()->exists()) {
                return response()->json([
                    'message' => 'Cannot delete mastertask containing subtasks with submitted timesheets.',
                ], 400);
            }
        }

        $mastertask->deleteAttachments();

        foreach ( $mastertask->subtasks as $subtask ) {
            $subtask->timeblocks()->delete();
        }

        $mastertask->subtasks()->delete();

        $mastertask->delete();

        return response()->json([
            'message' => 'Master Task deleted successfully.',
            'mastertask' => $mastertask
        ]);
    }

}