<?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($unitIds) && ($data['access_scope'] ?? 'unit') === 'unit') {
            $fallback = Auth::user()->units->first()?->id;
            $unitIds  = $fallback ? [$fallback] : [];
        }
        unset($data['unit_ids'], $data['unit_id']);

        $role = $this->resolveRole($data, $unitIds[0] ?? null);
        unset($data['user_type_id']);
        $data['user_type'] = $role?->slug ?? $data['user_type'];
        $data['franchisor_user_type_id'] = ($data['access_scope'] ?? 'unit') === 'franchisor' ? $role?->id : null;

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

        if (!empty($unitIds)) {
            $this->syncUnitRoles($user, $unitIds, $data['user_type']);
        }

        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']);

        $targetUnitId = $unitIds[0] ?? $unitId;
        $role = $this->resolveRole($data, $targetUnitId, $model);
        unset($data['user_type_id']);
        if ($role) {
            $data['user_type'] = $role->slug;
            $data['franchisor_user_type_id'] = ($data['access_scope'] ?? $model->access_scope) === 'franchisor'
                ? $role->id
                : null;
        }

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

        if (($data['access_scope'] ?? $model->access_scope) === 'franchisor') {
            $model->units()->sync([]);
        } elseif ($hasUnitIds) {
            $this->syncUnitRoles($model, array_filter($unitIds ?? []), $data['user_type'] ?? $model->user_type);
        } elseif ($hasUnitId) {
            $this->syncUnitRoles($model, $unitId ? [$unitId] : [], $data['user_type'] ?? $model->user_type);
        }

        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
    {
        $scope = request()->input('access_scope', Auth::user()?->access_scope);
        $unitId = request()->input('active_unit_id') ?? Auth::user()?->units()->value('units.id');

        return \App\Models\UserType::query()
            ->when($scope === 'unit', fn ($query) => $query->where('unit_id', $unitId))
            ->when($scope === 'franchisor', fn ($query) => $query->whereNull('unit_id'))
            ->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;
    }

    private function resolveRole(array $data, ?int $unitId, ?User $user = null): ?\App\Models\UserType
    {
        if (!empty($data['user_type_id'])) {
            return \App\Models\UserType::find($data['user_type_id']);
        }

        $slug = $data['user_type'] ?? $user?->user_type;
        $scope = $data['access_scope'] ?? $user?->access_scope;
        $type = \App\Models\UserType::query()
            ->where('slug', $slug)
            ->when($scope === 'unit', fn ($query) => $query->where('unit_id', $unitId))
            ->when($scope === 'franchisor', fn ($query) => $query->whereNull('unit_id'))
            ->first();

        abort_if(!$type, 422, 'O perfil não pertence ao contexto selecionado.');

        return $type;
    }

    private function syncUnitRoles(User $user, array $unitIds, string $slug): void
    {
        $roles = \App\Models\UserType::query()
            ->whereIn('unit_id', $unitIds)
            ->where('slug', $slug)
            ->pluck('id', 'unit_id');

        abort_if($roles->count() !== count($unitIds), 422, 'O perfil precisa existir em todas as unidades selecionadas.');

        $user->units()->sync(collect($unitIds)->mapWithKeys(
            fn ($id) => [$id => ['user_type_id' => $roles[$id]]],
        )->all());
    }
}