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

class CounterController extends Controller
{
    use ScopesApiToAccount;

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

        $counters = Counter::owned($owner)
            ->where('organization_id', $organization->id)
            ->with(['serviceQueues', 'branch'])
            ->orderBy('name')
            ->get()
            ->map(fn (Counter $c) => $this->serializeCounter($c));

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

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

        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'code' => ['nullable', 'string', 'max:50'],
            'destination' => ['nullable', 'string', 'max:255'],
            'staff_ref' => ['nullable', 'string', 'max:191'],
            'staff_display_name' => ['nullable', 'string', 'max:255'],
            'branch_id' => ['nullable', 'integer'],
            'branch_name' => ['nullable', 'string', 'max:255'],
            'department_id' => ['nullable', 'integer'],
            'queue_ids' => ['nullable', 'array'],
            'queue_ids.*' => ['uuid'],
            'queue_uuids' => ['nullable', 'array'],
            'queue_uuids.*' => ['uuid'],
            'external_key' => ['nullable', 'string', 'max:191'],
            'is_active' => ['nullable', 'boolean'],
        ]);

        $branch = $this->resolveBranch($request, $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 !== '') {
            $existing = Counter::owned($owner)
                ->where('organization_id', $organization->id)
                ->where('settings->external_key', $externalKey)
                ->first();

            if ($existing) {
                $existing->update([
                    'name' => $validated['name'],
                    'code' => $validated['code'] ?? $existing->code,
                    'destination' => array_key_exists('destination', $validated)
                        ? $validated['destination']
                        : $existing->destination,
                    'staff_ref' => array_key_exists('staff_ref', $validated)
                        ? $validated['staff_ref']
                        : $existing->staff_ref,
                    'staff_display_name' => array_key_exists('staff_display_name', $validated)
                        ? $validated['staff_display_name']
                        : $existing->staff_display_name,
                    'branch_id' => $branch->id,
                    'department_id' => $validated['department_id'] ?? $existing->department_id,
                    'is_active' => array_key_exists('is_active', $validated)
                        ? (bool) $validated['is_active']
                        : true,
                    'settings' => array_merge($existing->settings ?? [], ['external_key' => $externalKey]),
                ]);
                $this->syncQueues($existing, $owner, $validated);
                AuditLogger::record($owner, 'counter.updated', $organization->id, $owner, Counter::class, $existing->id);

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

        $counter = Counter::create([
            'owner_ref' => $owner,
            'organization_id' => $organization->id,
            'branch_id' => $branch->id,
            'department_id' => $validated['department_id'] ?? null,
            'name' => $validated['name'],
            'code' => $validated['code'] ?? null,
            'destination' => $validated['destination'] ?? null,
            'staff_ref' => $validated['staff_ref'] ?? null,
            'staff_display_name' => $validated['staff_display_name'] ?? null,
            'status' => 'offline',
            'is_active' => array_key_exists('is_active', $validated) ? (bool) $validated['is_active'] : true,
            'settings' => $externalKey !== '' ? ['external_key' => $externalKey] : null,
        ]);

        $this->syncQueues($counter, $owner, $validated);

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

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

    public function update(Request $request, Counter $counter): JsonResponse
    {
        $this->authorizeAbility($request, 'counters.manage');
        $this->authorizeOwner($request, $counter);

        $validated = $request->validate([
            'name' => ['sometimes', 'string', 'max:255'],
            'code' => ['nullable', 'string', 'max:50'],
            'destination' => ['nullable', 'string', 'max:255'],
            'staff_ref' => ['nullable', 'string', 'max:191'],
            'staff_display_name' => ['nullable', 'string', 'max:255'],
            'is_active' => ['sometimes', 'boolean'],
            'queue_ids' => ['nullable', 'array'],
            'queue_ids.*' => ['uuid'],
            'queue_uuids' => ['nullable', 'array'],
            'queue_uuids.*' => ['uuid'],
        ]);

        $counter->update(array_filter([
            'name' => $validated['name'] ?? null,
            'code' => array_key_exists('code', $validated) ? $validated['code'] : null,
            'destination' => array_key_exists('destination', $validated) ? $validated['destination'] : null,
            'staff_ref' => array_key_exists('staff_ref', $validated) ? $validated['staff_ref'] : null,
            'staff_display_name' => array_key_exists('staff_display_name', $validated)
                ? $validated['staff_display_name']
                : null,
            'is_active' => array_key_exists('is_active', $validated) ? (bool) $validated['is_active'] : null,
        ], fn ($v) => $v !== null));

        if (array_key_exists('queue_ids', $validated) || array_key_exists('queue_uuids', $validated)) {
            $this->syncQueues($counter, $this->ownerRef($request), $validated);
        }

        AuditLogger::record(
            $this->ownerRef($request),
            'counter.updated',
            $counter->organization_id,
            $this->ownerRef($request),
            Counter::class,
            $counter->id,
        );

        return response()->json(['data' => $this->serializeCounter($counter->fresh(['serviceQueues', 'branch']))]);
    }

    /**
     * @param  array<string, mixed>  $validated
     */
    protected function resolveBranch(Request $request, 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();
    }

    /**
     * @param  array<string, mixed>  $validated
     */
    protected function syncQueues(Counter $counter, string $owner, array $validated): void
    {
        $uuids = $validated['queue_uuids'] ?? $validated['queue_ids'] ?? null;
        if ($uuids === null) {
            return;
        }

        $queueIds = ServiceQueue::owned($owner)->whereIn('uuid', $uuids)->pluck('id');
        $counter->serviceQueues()->sync($queueIds);
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeCounter(Counter $c): array
    {
        return [
            'uuid' => $c->uuid,
            'name' => $c->name,
            'code' => $c->code,
            'destination' => $c->displayDestination(),
            'staff_ref' => $c->staff_ref,
            'staff_display_name' => $c->staff_display_name,
            'status' => $c->status,
            'is_active' => $c->is_active,
            'branch' => $c->branch?->name,
            'department_id' => $c->department_id,
            'external_key' => data_get($c->settings, 'external_key'),
            'queues' => $c->serviceQueues->map(fn (ServiceQueue $q) => [
                'uuid' => $q->uuid,
                'name' => $q->name,
                'prefix' => $q->prefix,
            ])->values()->all(),
        ];
    }
}