<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Api\Concerns\ScopesApiToAccount;
use App\Http\Controllers\Controller;
use App\Models\Branch;
use App\Models\Department;
use App\Services\Qms\AuditLogger;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class DepartmentController extends Controller
{
    use ScopesApiToAccount;

    public function index(Request $request): JsonResponse
    {
        $this->authorizeAbility($request, 'queues.view');
        $owner = $this->ownerRef($request);
        $organization = $this->organization($request);

        $departments = Department::owned($owner)
            ->whereHas('branch', fn ($q) => $q->where('organization_id', $organization->id))
            ->with('branch')
            ->orderBy('name')
            ->get()
            ->map(fn (Department $d) => $this->serialize($d));

        return response()->json(['data' => $departments]);
    }

    public function store(Request $request): JsonResponse
    {
        $this->authorizeAbility($request, 'queues.manage');
        $owner = $this->ownerRef($request);
        $organization = $this->organization($request);

        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'type' => ['nullable', 'string', 'max:50'],
            'branch_id' => ['nullable', 'integer'],
            'branch_name' => ['nullable', 'string', 'max:255'],
            'external_key' => ['nullable', 'string', 'max:191'],
            'is_active' => ['nullable', 'boolean'],
        ]);

        $branch = $this->resolveBranch($organization->id, $owner, $validated);
        abort_unless($branch, 422, 'A valid branch_id or branch_name is required.');

        $externalKey = isset($validated['external_key']) ? trim((string) $validated['external_key']) : '';
        if ($externalKey !== '') {
            $existing = Department::owned($owner)
                ->where('external_key', $externalKey)
                ->first();

            if ($existing) {
                $existing->update([
                    'name' => $validated['name'],
                    'type' => $validated['type'] ?? $existing->type,
                    'branch_id' => $branch->id,
                    'is_active' => array_key_exists('is_active', $validated)
                        ? (bool) $validated['is_active']
                        : true,
                ]);
                AuditLogger::record($owner, 'department.updated', $organization->id, $owner, Department::class, $existing->id);

                return response()->json(['data' => $this->serialize($existing->fresh('branch'))]);
            }
        }

        $byName = Department::owned($owner)
            ->where('branch_id', $branch->id)
            ->whereRaw('LOWER(name) = ?', [strtolower($validated['name'])])
            ->first();

        if ($byName) {
            $byName->update([
                'type' => $validated['type'] ?? $byName->type,
                'external_key' => $externalKey !== '' ? $externalKey : $byName->external_key,
                'is_active' => array_key_exists('is_active', $validated) ? (bool) $validated['is_active'] : true,
            ]);
            AuditLogger::record($owner, 'department.updated', $organization->id, $owner, Department::class, $byName->id);

            return response()->json(['data' => $this->serialize($byName->fresh('branch'))]);
        }

        $department = Department::create([
            'owner_ref' => $owner,
            'branch_id' => $branch->id,
            'name' => $validated['name'],
            'type' => $validated['type'] ?? 'general',
            'external_key' => $externalKey !== '' ? $externalKey : null,
            'is_active' => array_key_exists('is_active', $validated) ? (bool) $validated['is_active'] : true,
        ]);

        AuditLogger::record($owner, 'department.created', $organization->id, $owner, Department::class, $department->id);

        return response()->json(['data' => $this->serialize($department->fresh('branch'))], 201);
    }

    /**
     * @param  array<string, mixed>  $validated
     */
    protected function resolveBranch(int $organizationId, string $owner, array $validated): ?Branch
    {
        if (! empty($validated['branch_id'])) {
            return Branch::owned($owner)
                ->where('organization_id', $organizationId)
                ->where('id', (int) $validated['branch_id'])
                ->first();
        }

        $branchName = trim((string) ($validated['branch_name'] ?? ''));
        if ($branchName === '') {
            return null;
        }

        return Branch::owned($owner)
            ->where('organization_id', $organizationId)
            ->whereRaw('LOWER(name) = ?', [strtolower($branchName)])
            ->first();
    }

    /**
     * @return array<string, mixed>
     */
    protected function serialize(Department $d): array
    {
        return [
            'id' => $d->id,
            'name' => $d->name,
            'type' => $d->type,
            'external_key' => $d->external_key,
            'is_active' => $d->is_active,
            'branch' => $d->branch?->name,
            'branch_id' => $d->branch_id,
        ];
    }
}