<?php

declare(strict_types=1);

namespace App\Repositories;

use App\Models\Leave;
use App\Models\LeaveHistory;
use Exception;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Collection;

class LeaveRepository extends BaseRepository implements LeaveRepositoryInterface
{
    public function __construct(Leave $model)
    {
        parent::__construct($model);
    }

    public function all(array $columns = ['*']): Collection
    {
        return $this->model->newQuery()
            ->with(['employee', 'approver', 'histories.user'])
            ->orderByDesc('start_date')
            ->get($columns);
    }

    public function find(int|string $id, array $columns = ['*']): ?Model
    {
        return $this->model->newQuery()
            ->with(['employee', 'approver', 'histories.user'])
            ->find($id, $columns);
    }

    public function create(array $attributes): Model
    {
        try {
            DB::beginTransaction();

            /** @var Leave $leave */
            $leave = $this->model->newQuery()->create($attributes);

            $this->recordHistory(
                $leave,
                null,
                $leave->status,
                $attributes['approved_by'] ?? null,
                $attributes['notes'] ?? null
            );

            DB::commit();

            return $leave->load(['employee', 'approver', 'histories.user']);
        } catch (Exception $e) {
            DB::rollBack();
            Log::error('Error creating leave: ' . $e->getMessage(), [
                'attributes' => $attributes,
                'exception' => $e,
            ]);
            throw $e;
        }
    }

    public function update(int|string $id, array $attributes): bool
    {
        try {
            DB::beginTransaction();

            /** @var Leave|null $leave */
            $leave = $this->model->newQuery()->find($id);
            if (!$leave) {
                DB::rollBack();
                return false;
            }

            $oldStatus = $leave->status;
            $result = $leave->fill($attributes)->save();

            if (array_key_exists('status', $attributes) && $attributes['status'] !== $oldStatus) {
                $this->recordHistory(
                    $leave,
                    $oldStatus,
                    $leave->status,
                    $attributes['approved_by'] ?? $leave->approved_by,
                    $attributes['notes'] ?? null
                );
            }

            DB::commit();

            return $result;
        } catch (Exception $e) {
            DB::rollBack();
            Log::error('Error updating leave with ID ' . $id . ': ' . $e->getMessage(), [
                'id' => $id,
                'attributes' => $attributes,
                'exception' => $e,
            ]);
            throw $e;
        }
    }

    public function getPaginated(int $perPage = 10, array $filters = []): array
    {
        $query = $this->model->newQuery()->with(['employee', 'approver', 'histories.user']);

        if (!empty($filters['employee_id'])) {
            $query->where('employee_id', (int) $filters['employee_id']);
        }

        if (!empty($filters['type'])) {
            $query->where('type', $filters['type']);
        }

        if (!empty($filters['status'])) {
            $query->where('status', $filters['status']);
        }

        if (!empty($filters['start_date'])) {
            $query->whereDate('start_date', '>=', $filters['start_date']);
        }

        if (!empty($filters['end_date'])) {
            $query->whereDate('end_date', '<=', $filters['end_date']);
        }

        if (!empty($filters['search'])) {
            $search = (string) $filters['search'];
            $query->where(function ($subQuery) use ($search) {
                $subQuery->where('reason', 'like', '%' . $search . '%')
                    ->orWhere('notes', 'like', '%' . $search . '%')
                    ->orWhereHas('employee', function ($employeeQuery) use ($search) {
                        $employeeQuery->where('first_name', 'like', '%' . $search . '%')
                            ->orWhere('last_name', 'like', '%' . $search . '%')
                            ->orWhere('email', 'like', '%' . $search . '%');
                    });
            });
        }

        $sortField = $filters['sort_by'] ?? 'start_date';
        $sortDirection = $filters['sort_direction'] ?? 'desc';

        $allowedSortFields = ['start_date', 'end_date', 'status', 'type', 'created_at'];
        if (!in_array($sortField, $allowedSortFields, true)) {
            $sortField = 'start_date';
        }

        $sortDirection = strtolower((string) $sortDirection) === 'asc' ? 'asc' : 'desc';

        $paginator = $query
            ->orderBy($sortField, $sortDirection)
            ->paginate($perPage);

        return [
            'leaves' => $paginator->getCollection(),
            'pagination' => [
                'current_page' => $paginator->currentPage(),
                'last_page' => $paginator->lastPage(),
                'per_page' => $paginator->perPage(),
                'total' => $paginator->total(),
                'from' => $paginator->firstItem(),
                'to' => $paginator->lastItem(),
            ],
        ];
    }

    private function recordHistory(
        Leave $leave,
        ?string $oldStatus,
        string $newStatus,
        int|string|null $changedBy = null,
        ?string $comment = null
    ): void {
        LeaveHistory::query()->create([
            'leave_id' => $leave->id,
            'old_status' => $oldStatus,
            'new_status' => $newStatus,
            'changed_by' => $changedBy,
            'changed_at' => now(),
            'comment' => $comment,
        ]);
    }
}