<?php

namespace Modules\HRM\Repositories;

use App\Abstracts\EntityRepository;
use Carbon\Carbon;
use Illuminate\Contracts\Pagination\Paginator;
use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
use Illuminate\Database\Query\Builder;
use Illuminate\Support\Facades\DB;
use Modules\HRM\Models\Attendance;
use Modules\HRM\Models\AttendanceLog;

class AttendanceRepository extends EntityRepository
{
    public string $table = Attendance::TABLE_NAME;

    protected array $fillableColumns = [
        'restaurant_id',
        'employee_id',
        'date',
        'first_clock_in',
        'last_clock_out',
        'hours_worked',
        'status',
        'breaks',
        'notes',
    ];

    protected function getQuery(): Builder
    {
        return parent::getQuery();
    }

    protected function getFilterData(array $filterData = []): array
    {
        return array_merge([
            'perPage' => 10,
            'search' => '',
            'orderBy' => 'id',
            'order' => 'desc',
            'with_deleted' => false,
        ], $filterData);
    }

    public function getAttendanceQuery(): EloquentBuilder
    {
        return Attendance::with(['employee', 'logs']);
    }

    protected function filterSearchQuery(Builder|EloquentBuilder $query, string $searchedText): Builder
    {
        $searchable = "%$searchedText%";

        return $query->where("{$this->table}.status", 'LIKE', $searchable);
    }

    public function getAll(array $filterData = []): Paginator
    {
        $filter = $this->getFilterData($filterData);
        $query = $this->getAttendanceQuery();

        if (! $filter['with_deleted']) {
            $query->whereNull("{$this->table}.deleted_at");
        }

        if (! empty($filter['search'])) {
            $query = $this->filterSearchQuery($query, $filter['search']);
        }

        return $query->orderBy($filter['orderBy'], $filter['order'])
            ->paginate($filter['perPage']);
    }

    public function getCount(array $filterData = []): int
    {
        $filter = $this->getFilterData($filterData);
        $query = $this->getQuery();

        if (! $filter['with_deleted']) {
            $query->whereNull("{$this->table}.deleted_at");
        }

        return $query->count();
    }

    /**
     * CREATE ATTENDANCE + LOGS
     */
    public function create(array $data): Attendance
    {
        return DB::transaction(function () use ($data) {

            $date = $data['date'];
            $employee = $data['employee_id'];

            // Always fetch today attendance or create new
            $attendance = Attendance::firstOrNew([
                'employee_id' => $employee,
                'date' => $date,
            ]);

            $prepared = $this->prepareForDB($data, $attendance->exists ? $attendance : null);

            // Save attendance
            $attendance->fill($prepared)->save();

            // Insert Punch Logs
            if (! empty($data['clock_in'])) {
                $this->insertLog($attendance, 'in', $data['clock_in']);
            }

            if (! empty($data['clock_out'])) {
                $this->insertLog($attendance, 'out', $data['clock_out']);
            }

            // Recalculate working hours after logs
            $this->recalculateWorkedHours($attendance);

            return $attendance;
        });
    }

    /**
     * UPDATE ATTENDANCE + REBUILD LOGS
     */
    public function update(int $id, array $data): object
    {
        return DB::transaction(function () use ($id, $data) {

            $attendance = Attendance::findOrFail($id);
            $prepared = $this->prepareForDB($data, $attendance);

            $attendance->update($prepared);

            // Remove old logs
            AttendanceLog::where('attendance_id', $id)->delete();

            // Add new logs
            if (! empty($data['clock_in'])) {
                $this->insertLog($attendance, 'in', $data['clock_in']);
            }

            if (! empty($data['clock_out'])) {
                $this->insertLog($attendance, 'out', $data['clock_out']);
            }

            $this->recalculateWorkedHours($attendance);

            return $this->getById($id);
        });
    }

    /**
     * MAP REQUEST TO DB FIELDS
     */
    public function prepareForDB(array $data, ?object $item = null): array
    {
        $data = parent::prepareForDB($data, $item);

        if (! $item) {
            $data['created_at'] = now();
            $data['restaurant_id'] = $this->getCurrentRestaurantId();
        } else {
            $data['updated_at'] = now();
        }

        if (isset($data['clock_in'])) {
            $data['first_clock_in'] = $data['clock_in'];
            unset($data['clock_in']);
        }

        if (isset($data['clock_out'])) {
            $data['last_clock_out'] = $data['clock_out'];
            unset($data['clock_out']);
        }

        if (isset($data['breaks']) && is_array($data['breaks'])) {
            $data['breaks'] = json_encode($data['breaks']);
        }

        if (isset($data['notes']) && is_array($data['notes'])) {
            $data['notes'] = json_encode($data['notes']);
        }

        return $data;
    }

    /**
     * INSERT SINGLE PUNCH LOG ENTRY
     */
    private function insertLog(Attendance $attendance, string $type, string $time)
    {
        if (empty($time)) {
            return;
        }

        $dateTime = Carbon::parse($attendance->date.' '.$time)->format('Y-m-d H:i:s');

        AttendanceLog::create([
            'attendance_id' => $attendance->id,
            'employee_id' => $attendance->employee_id,
            'restaurant_id' => $attendance->restaurant_id,
            'type' => $type, // in or out
            'punch_time' => $dateTime,
            'created_at' => now(),
        ]);
    }

    /**
     * RECALCULATE TOTAL WORKED HOURS BASED ON ALL LOGS
     */
    private function recalculateWorkedHours(Attendance $attendance)
    {
        $logs = AttendanceLog::where('attendance_id', $attendance->id)
            ->orderBy('punch_time')
            ->get();

        if ($logs->count() < 2) {
            return;
        }

        $first = Carbon::parse($logs->first()->punch_time);
        $last = Carbon::parse($logs->last()->punch_time);

        $hours = round($first->diffInMinutes($last) / 60, 2);

        $attendance->update([
            'first_clock_in' => $first,
            'last_clock_out' => $last,
            'hours_worked' => $hours,
        ]);
    }

    protected function getExceptionMessages(): array
    {
        return [
            static::MESSAGE_ITEM_DOES_NOT_EXIST_MESSAGE => 'Attendance does not exist.',
            static::MESSAGE_ITEM_COULD_NOT_BE_DELETED => 'Attendance could not be deleted.',
        ];
    }
}