<?php

namespace App\Services;

use App\Models\UnitUser;
use App\Models\User;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Storage;

class UserService
{
    public function authUser(): ?User
    {
        return Auth::user()->load('units');
    }

    public function getAll(): Collection
    {
        return User::with(['state', 'units', 'userType'])->orderBy('name')->get();
    }

    public function getAllByUnit(): Collection
    {
        $unitId = request()->input('active_unit_id') ?? Auth::user()->units->first()?->id;

        if (!$unitId) {
            return User::with(['state', 'units', 'userType'])->whereNull('id')->get();
        }

        return User::with(['state', 'units', 'userType'])
            ->whereHas('units', fn($q) => $q->where('units.id', $unitId))
            ->orderBy('name')
            ->get();
    }

    public function findById(int $id): ?User
    {
        return User::with(['state', 'units', 'userType'])->find($id);
    }

    public function create(array $data): User
    {
        // Suporta unit_ids[] (múltiplas) ou unit_id (retrocompatibilidade)
        $unitIds = $data['unit_ids'] ?? null;
        if (empty($unitIds) && isset($data['unit_id'])) {
            $unitIds = array_filter([$data['unit_id']]);
        }
        if (empty($unitIds)) {
            $fallback = Auth::user()->units->first()?->id;
            $unitIds  = $fallback ? [$fallback] : [];
        }
        unset($data['unit_ids'], $data['unit_id']);

        $data = $this->handleAvatar($data);
        $user = User::create($data);

        if (!empty($unitIds)) {
            $user->units()->sync($unitIds);
        }

        return $user->load('state', 'units');
    }

    public function update(int $id, array $data): ?User
    {
        $model = $this->findById($id);

        if (!$model) {
            return null;
        }

        // Suporta unit_ids[] (múltiplas) com fallback para unit_id (retrocompatibilidade)
        $hasUnitIds = array_key_exists('unit_ids', $data);
        $unitIds    = $data['unit_ids'] ?? null;
        $hasUnitId  = array_key_exists('unit_id', $data);
        $unitId     = $data['unit_id'] ?? null;
        unset($data['unit_ids'], $data['unit_id']);

        $data = $this->handleAvatar($data, $model->avatar_url);
        $model->update($data);

        if ($hasUnitIds) {
            $model->units()->sync(array_filter($unitIds ?? []));
        } elseif ($hasUnitId) {
            $model->units()->sync($unitId ? [$unitId] : []);
        }

        return $model->fresh(['state', 'units']);
    }

    public function delete(int $id): bool
    {
        $model = $this->findById($id);

        if (!$model) {
            return false;
        }

        if ($model->avatar_url) {
            Storage::delete($model->avatar_url);
        }

        return $model->delete();
    }

    public function getUserTypes(): \Illuminate\Database\Eloquent\Collection
    {
        return \App\Models\UserType::orderBy('label')->get();
    }

    private function handleAvatar(array $data, ?string $oldAvatarPath = null): array
    {
        if (!isset($data['avatar'])) {
            return $data;
        }

        if ($data['avatar'] instanceof UploadedFile) {
            if ($oldAvatarPath) {
                Storage::delete($oldAvatarPath);
            }
            $data['avatar_url'] = $data['avatar']->store('users/avatars');
        } elseif (is_null($data['avatar'])) {
            if ($oldAvatarPath) {
                Storage::delete($oldAvatarPath);
            }
            $data['avatar_url'] = null;
        }

        unset($data['avatar']);
        return $data;
    }
}