<?php

namespace App\Http\Controllers;

use App\Http\Resources\BlockerResource;
use App\Http\Resources\SubTaskResource;
use App\Models\Attachment;
use App\Models\Blocker;
use App\Models\MasterTask;
use App\Models\SubTask;
use App\Models\User;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

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

        // unscheduled tasks
        if (isset($parameters['type']) && $parameters['type'] == 'unscheduled') {
            return $this->indexUnscheduled($request);
        }

        // ongoing tasks
        if (isset($parameters['type']) && $parameters['type'] == 'ongoing') {
            return $this->indexOngoing($request);
        }

        $parameters['user_id'] = ( $parameters['employee_id'] ?? null );

        $validator = Validator::make($request->all(), [
            'start' => 'required',
            'end' => 'required',
        ]);

        $validator->after(function ($validator) use ($parameters) {

            if ( !isset($parameters['employee_id']) && !isset($parameters['team_id'])) {
                $validator->errors()->add(
                    'error', 'You must provide either employee_id or team_id.'
                );
            }
        });

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

        if (isset($parameters['team_id'])) {
            $subtasks = SubTask::whereHas('mastertask', function ($query) use ($parameters) {
                $query->where('team_id', $parameters['team_id']);
            })->whereHas('timeblocks', function ($query) use ($parameters) {
                $query->where('start', '>=', $parameters['start']);
                $query->where('end', '<=', $parameters['end']);
            })->get();

            $userIdArray = User::whereHas('teams', function ($query) use ($parameters) {
                $query->where('team_id', $parameters['team_id']);
            })->get()->pluck('id')->toArray();

        } else if (isset($parameters['user_id'])) {
            $subtasks = SubTask::where('user_id', $parameters['user_id'])->whereHas('timeblocks', function ($query) use ($parameters) {
                $query->where('start', '>=', $parameters['start']);
                $query->where('end', '<=', $parameters['end']);
            })->get();

            $userIdArray = [$parameters['user_id']];
        }

        $blockers = Blocker::whereIn('user_id', $userIdArray)->where('start', '>=', $parameters['start'])->where('end', '<=', $parameters['end'])->get();

        return response()->json([
            'subtasks' => SubTaskResource::collection($subtasks),
            'blockers' => BlockerResource::collection($blockers),
        ], 200);
    }

    private function indexUnscheduled(Request $request) {
        // get query parameter from request
        $parameters = $request->query();

        $validator = Validator::make( $parameters, [
            'employee_id' => 'required',
        ] );

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

        $parameters['user_id'] = $parameters['employee_id'];

        $subtasks = SubTask::where('user_id', $parameters['user_id'])->where('is_finished', 0)->whereDoesntHave( 'timeblocks')->get();

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

    private function indexOngoing(Request $request) {
        // get query parameter from request
        $parameters = $request->query();

        $validator = Validator::make( $parameters, [
            'employee_id' => 'required',
        ] );

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

        $parameters['user_id'] = $parameters['employee_id'];

        $subtasks = SubTask::where('user_id', $parameters['user_id'])->where('is_finished', 0)->get();

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


    public function store($mastertask_id, Request $request)
    {
        $validator = Validator::make($request->all(), [
            'data.employee_id' => 'required',
            'data.duration' => 'required',
        ]);

        // validacia, ci uz subtask pre tohto usera a mastertask neexistuje
        $validator->after(function ($validator) use ($mastertask_id, $request) {
            if (SubTask::where('master_task_id', $mastertask_id)->where('user_id', $request->all()['data']['employee_id'])->exists()) {
                $validator->errors()->add(
                    'data.employee_id', 'Sub task already exists for this employee and master task.'
                );
            }
        });

        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')) {
            foreach ( $files['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']['user_id'] = $request->all()['data']['employee_id'];
        $data['data']['estimated_time'] = $request->all()['data']['duration'];
        $data['data']['created_by'] = User::getUserIdFromBearerToken($request->bearerToken());

        $request->merge($data);

        $mastertask = MasterTask::find($mastertask_id);
        $subtask = $mastertask->subtasks()->create($request->all()['data']);

        // syncnutie timeblocks
        $subtask->syncTimeblocks($data['data']['timeblocks']);

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

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

    // TODO zabezpecit, ze ked sa meni user, tak nech sa dvojmu nevlozia jeho vykazy
    public function update($id, Request $request)
    {
        $subtask = SubTask::find($id);

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

        // ak chcem ukoncit subtask, ktory nema natrackovany cas, tak to nedovolim
        if (isset($request->all()['data']['is_finished']) && $request->all()['data']['is_finished'] == 1 && $subtask->timesheets->count() == 0) {
            return response()->json([
                'message' => 'Cannot finish subtask with untracked time.',
            ], 400);
        }

        $validator = Validator::make($request->all(), [
            'data.employee_id' => 'required',
            'data.duration' => 'required',
        ]);

        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']['user_id'] = $request->all()['data']['employee_id'];
        $data['data']['estimated_time'] = $request->all()['data']['duration'];

        $request->merge($data);

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

        // syncnutie vykazu
        $subtask->syncTimesheets($data['data']['timesheets']);

        // syncnutie timeblocks
        $subtask->syncTimeblocks($data['data']['timeblocks']);

        return response()->json([
            'message' => 'Subtask updated successfully',
            'subtask' => new SubTaskResource($subtask)
        ]);
    }

    public function delete($id)
    {
        $subtask = SubTask::find($id);

        // ak existuje timesheet k subtasku, nemoze sa zmazat
        if ($subtask->timesheets()->exists()) {
            return response()->json([
                'message' => 'Cannot delete subtask with submitted timesheets.',
            ], 400);
        }

        $subtask->timeblocks()->delete();

        $subtask->deleteAttachments();

        $subtask->delete();

        return response()->json([
            'message' => 'Subtask deleted successfully.',
            'subtask' => $subtask
        ]);
    }

    public function submitTimesheet($id, Request $request)
    {
        $subtask = SubTask::find($id);

        $validator = Validator::make($request->all(), [
            'data.employee_id' => 'required',
            'data.time' => 'required',
        ]);

        // validacia, ci dany user moze submitovat timesheet - ci mu patri subtask
        $validator->after(function ($validator) use ($subtask, $request) {
            if ($subtask->user_id != $request->all()['data']['employee_id']) {
                $validator->errors()->add(
                    'data.employee_id', 'This user cannot submit timesheet for the selected subtask. Subtask is assigned to user with id: ' . $subtask->user_id . '.'
                );
            }
        });

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

        $subtask->timesheets()->insert([
            'time' => $request->all()['data']['time'],
            'user_id' => $request->all()['data']['employee_id'],
            'sub_task_id' => $subtask->id,
            "created_at" =>  Carbon::now(),
            "updated_at" => Carbon::now(),
        ]);

        return response()->json([
            'message' => 'Subtask timesheet submitted successfully.',
            'subtask' => $subtask
        ], 201);
    }

}