<?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\ServiceQueue;
use App\Services\Qms\AuditLogger;
use App\Services\Qms\PlanService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class ServiceQueueController extends Controller
{
    use ScopesApiToAccount;

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

        $queues = ServiceQueue::owned($owner)
            ->where('organization_id', $organization->id)
            ->with(['branch', 'department'])
            ->orderBy('name')
            ->get()
            ->map(fn (ServiceQueue $q) => $this->serializeQueue($q));

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

    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'],
            'description' => ['nullable', 'string', 'max:1000'],
            'branch_id' => ['nullable', 'integer'],
            'branch_name' => ['nullable', 'string', 'max:255'],
            'department_id' => ['nullable', 'integer'],
            'color' => ['nullable', 'string', 'max:20'],
            'prefix' => ['required', 'string', 'max:10'],
            'strategy' => ['nullable', 'string', 'in:'.implode(',', array_keys(config('qms.queue_strategies')))],
            'avg_service_seconds' => ['nullable', 'integer', 'min:60', 'max:7200'],
            'max_capacity' => ['nullable', 'integer', 'min:1'],
            'is_active' => ['nullable', 'boolean'],
            'external_key' => ['nullable', 'string', 'max:191'],
        ]);

        $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 !== '') {
            $existing = ServiceQueue::owned($owner)
                ->where('organization_id', $organization->id)
                ->where('settings->external_key', $externalKey)
                ->first();

            if ($existing) {
                $existing->update([
                    'name' => $validated['name'],
                    'description' => $validated['description'] ?? $existing->description,
                    'branch_id' => $branch->id,
                    'department_id' => $validated['department_id'] ?? $existing->department_id,
                    'color' => $validated['color'] ?? $existing->color,
                    'prefix' => $validated['prefix'],
                    'strategy' => $validated['strategy'] ?? $existing->strategy,
                    'avg_service_seconds' => $validated['avg_service_seconds'] ?? $existing->avg_service_seconds,
                    'max_capacity' => $validated['max_capacity'] ?? $existing->max_capacity,
                    'is_active' => array_key_exists('is_active', $validated)
                        ? (bool) $validated['is_active']
                        : true,
                    'settings' => array_merge($existing->settings ?? [], ['external_key' => $externalKey]),
                ]);
                AuditLogger::record($owner, 'service_queue.updated', $organization->id, $owner, ServiceQueue::class, $existing->id);

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

        // Fall back to name + branch match so Care/manual admin create do not duplicate.
        $byName = ServiceQueue::owned($owner)
            ->where('organization_id', $organization->id)
            ->where('branch_id', $branch->id)
            ->whereRaw('LOWER(name) = ?', [strtolower($validated['name'])])
            ->first();

        if ($byName) {
            $settings = $byName->settings ?? [];
            if ($externalKey !== '') {
                $settings['external_key'] = $externalKey;
            }
            $byName->update([
                'prefix' => $validated['prefix'],
                'strategy' => $validated['strategy'] ?? $byName->strategy,
                'is_active' => array_key_exists('is_active', $validated) ? (bool) $validated['is_active'] : true,
                'settings' => $settings !== [] ? $settings : $byName->settings,
            ]);
            AuditLogger::record($owner, 'service_queue.updated', $organization->id, $owner, ServiceQueue::class, $byName->id);

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

        $currentCount = ServiceQueue::owned($owner)->where('organization_id', $organization->id)->count();
        abort_unless(
            app(PlanService::class)->canAddQueue($organization, $currentCount),
            422,
            'Queue limit reached for current plan.',
        );

        $queue = ServiceQueue::create([
            'owner_ref' => $owner,
            'organization_id' => $organization->id,
            'branch_id' => $branch->id,
            'department_id' => $validated['department_id'] ?? null,
            'name' => $validated['name'],
            'description' => $validated['description'] ?? null,
            'color' => $validated['color'] ?? '#4f46e5',
            'prefix' => $validated['prefix'],
            'strategy' => $validated['strategy'] ?? 'fifo',
            'avg_service_seconds' => $validated['avg_service_seconds'] ?? 300,
            'max_capacity' => $validated['max_capacity'] ?? null,
            'is_active' => array_key_exists('is_active', $validated) ? (bool) $validated['is_active'] : true,
            'settings' => $externalKey !== '' ? ['external_key' => $externalKey] : null,
        ]);

        AuditLogger::record($owner, 'service_queue.created', $organization->id, $owner, ServiceQueue::class, $queue->id);

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

    public function update(Request $request, ServiceQueue $serviceQueue): JsonResponse
    {
        $this->authorizeAbility($request, 'queues.manage');
        $this->authorizeOwner($request, $serviceQueue);

        $validated = $request->validate([
            'name' => ['sometimes', 'string', 'max:255'],
            'description' => ['nullable', 'string', 'max:1000'],
            'prefix' => ['sometimes', 'string', 'max:10'],
            'strategy' => ['sometimes', 'string', 'in:'.implode(',', array_keys(config('qms.queue_strategies')))],
            'is_active' => ['sometimes', 'boolean'],
            'avg_service_seconds' => ['nullable', 'integer', 'min:60', 'max:7200'],
            'max_capacity' => ['nullable', 'integer', 'min:1'],
        ]);

        $serviceQueue->update($validated);

        AuditLogger::record(
            $this->ownerRef($request),
            'service_queue.updated',
            $serviceQueue->organization_id,
            $this->ownerRef($request),
            ServiceQueue::class,
            $serviceQueue->id,
        );

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

    public function waiting(Request $request, ServiceQueue $serviceQueue): JsonResponse
    {
        $this->authorizeAbility($request, 'queues.view');
        $this->authorizeOwner($request, $serviceQueue);

        $tickets = app(\App\Services\Qms\QueueEngine::class)->waitingTickets($serviceQueue);

        return response()->json([
            'data' => array_map(fn ($t) => \App\Services\Qms\TicketPresenter::toArray($t), $tickets),
        ]);
    }

    public function pause(Request $request, ServiceQueue $serviceQueue): JsonResponse
    {
        $this->authorizeAbility($request, 'queues.manage');
        $this->authorizeOwner($request, $serviceQueue);

        $queue = app(\App\Services\Qms\QueueEngine::class)->pauseQueue($serviceQueue, $this->ownerRef($request));

        return response()->json(['data' => ['uuid' => $queue->uuid, 'is_paused' => $queue->is_paused]]);
    }

    public function resume(Request $request, ServiceQueue $serviceQueue): JsonResponse
    {
        $this->authorizeAbility($request, 'queues.manage');
        $this->authorizeOwner($request, $serviceQueue);

        $queue = app(\App\Services\Qms\QueueEngine::class)->resumeQueue($serviceQueue, $this->ownerRef($request));

        return response()->json(['data' => ['uuid' => $queue->uuid, 'is_paused' => $queue->is_paused]]);
    }

    /**
     * @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 serializeQueue(ServiceQueue $q): array
    {
        return [
            'uuid' => $q->uuid,
            'name' => $q->name,
            'prefix' => $q->prefix,
            'strategy' => $q->strategy,
            'is_active' => $q->is_active,
            'is_paused' => $q->is_paused,
            'branch' => $q->branch?->name,
            'external_key' => data_get($q->settings, 'external_key'),
        ];
    }
}