<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Call;
use App\Models\QualityReview;
use App\Services\ActivityLogger;
use App\Support\AccessControl;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Gate;

class QualityReviewController extends Controller
{
    private const SCORE_FIELDS = [
        'greeting_score',
        'product_intro_score',
        'needs_discovery_score',
        'objection_handling_score',
        'closing_score',
        'crm_accuracy_score',
        'follow_up_quality_score',
    ];

    public function index(Request $request): JsonResponse
    {
        Gate::authorize('viewAny', QualityReview::class);

        if ($request->has('current_only')) {
            $request->merge([
                'current_only' => filter_var(
                    $request->input('current_only'),
                    FILTER_VALIDATE_BOOLEAN,
                    FILTER_NULL_ON_FAILURE,
                ),
            ]);
        }

        $filters = $request->validate([
            'agent_id' => 'nullable|integer|exists:users,id',
            'score_min' => 'nullable|integer|min:0|max:100',
            'score_max' => 'nullable|integer|min:0|max:100|gte:score_min',
            'status' => 'nullable|string|max:30',
            'shared' => 'nullable|boolean',
            'date_from' => 'nullable|date',
            'date_to' => 'nullable|date|after_or_equal:date_from',
            'result' => 'nullable|string|max:50',
            'has_recording' => 'nullable|boolean',
            'weak_section' => 'nullable|in:greeting_score,product_intro_score,needs_discovery_score,objection_handling_score,closing_score,crm_accuracy_score,follow_up_quality_score',
            'weak_threshold' => 'nullable|integer|min:0|max:100',
            'current_only' => 'nullable|boolean',
            'page' => 'nullable|integer|min:1',
            'per_page' => 'nullable|integer|min:1|max:100',
        ]);
        $user = $request->user();
        $query = QualityReview::with('call:id,lead_id,user_id,result,recording_url,created_at', 'agent:id,name', 'reviewer:id,name');

        if ($user->hasRole('agent')) {
            $query->where('agent_id', $user->id)->where('is_shared_with_agent', true);
        } elseif ($user->hasRole('supervisor')) {
            $query->whereHas('call', fn ($callQuery) => AccessControl::scopeCalls($callQuery, $user));
        }

        if ($request->boolean('current_only', true)) {
            $query->where('is_current', true);
        }
        if (! empty($filters['agent_id'])) {
            $query->where('agent_id', $filters['agent_id']);
        }
        if (isset($filters['score_min'])) {
            $query->where('overall_score', '>=', $filters['score_min']);
        }
        if (isset($filters['score_max'])) {
            $query->where('overall_score', '<=', $filters['score_max']);
        }
        if (! empty($filters['status'])) {
            $query->where('status', $filters['status']);
        }
        if (array_key_exists('shared', $filters)) {
            $query->where('is_shared_with_agent', (bool) $filters['shared']);
        }
        if (! empty($filters['date_from'])) {
            $query->whereDate('created_at', '>=', $filters['date_from']);
        }
        if (! empty($filters['date_to'])) {
            $query->whereDate('created_at', '<=', $filters['date_to']);
        }
        if (! empty($filters['result'])) {
            $query->whereHas('call', fn ($call) => $call->where('result', $filters['result']));
        }
        if (array_key_exists('has_recording', $filters)) {
            $query->whereHas('call', fn ($call) => (bool) $filters['has_recording']
                ? $call->whereNotNull('recording_url')
                : $call->whereNull('recording_url'));
        }
        if (! empty($filters['weak_section'])) {
            $query->where($filters['weak_section'], '<', $filters['weak_threshold'] ?? 60);
        }

        return response()->json($query->latest()->paginate(min((int) $request->get('per_page', 15), 100)));
    }

    public function store(Request $request): JsonResponse
    {
        $validated = $request->validate(array_merge([
            'call_id' => 'required|exists:calls,id',
            'feedback' => 'nullable|string',
            'tag' => 'nullable|string|max:30',
            'is_shared_with_agent' => 'nullable|boolean',
            'strengths' => 'nullable|array|max:20',
            'improvement_areas' => 'nullable|array|max:20',
        ], $this->scoreRules()));

        $call = Call::findOrFail($validated['call_id']);
        Gate::authorize('create', [QualityReview::class, $call]);

        $review = DB::transaction(function () use ($validated, $call, $request): QualityReview {
            $latestVersion = QualityReview::where('call_id', $call->id)->lockForUpdate()->max('version') ?? 0;
            QualityReview::where('call_id', $call->id)->update(['is_current' => false]);

            return QualityReview::create($validated + [
                'reviewer_id' => $request->user()->id,
                'agent_id' => $call->user_id,
                'version' => $latestVersion + 1,
                'is_current' => true,
                'is_shared_with_agent' => $validated['is_shared_with_agent'] ?? false,
                'overall_score' => $this->overallScore($validated),
            ]);
        });

        ActivityLogger::log('quality_review_created', "Quality review for call {$call->id} created", $review);

        return response()->json($review->load('call:id,lead_id,user_id,created_at', 'agent:id,name', 'reviewer:id,name'), 201);
    }

    public function show(QualityReview $qualityReview): JsonResponse
    {
        Gate::authorize('view', $qualityReview);

        return response()->json($qualityReview->load('call.lead', 'agent:id,name', 'reviewer:id,name'));
    }

    public function update(Request $request, QualityReview $qualityReview): JsonResponse
    {
        Gate::authorize('update', $qualityReview);
        $validated = $request->validate(array_merge([
            'feedback' => 'nullable|string',
            'tag' => 'nullable|string|max:30',
            'is_shared_with_agent' => 'nullable|boolean',
            'strengths' => 'nullable|array|max:20',
            'improvement_areas' => 'nullable|array|max:20',
        ], $this->scoreRules(required: false)));

        if (collect(self::SCORE_FIELDS)->contains(fn (string $field) => array_key_exists($field, $validated))) {
            $validated['overall_score'] = $this->overallScore(array_merge($qualityReview->only(self::SCORE_FIELDS), $validated));
        }

        $qualityReview->update($validated);
        ActivityLogger::log('quality_review_updated', "Quality review {$qualityReview->id} updated", $qualityReview);

        return response()->json($qualityReview->fresh(['call:id,lead_id,user_id,created_at', 'agent:id,name', 'reviewer:id,name']));
    }

    public function acknowledge(Request $request, QualityReview $qualityReview): JsonResponse
    {
        abort_unless($request->user()->can('acknowledge_quality_reviews'), 403);
        Gate::authorize('view', $qualityReview);
        abort_unless($qualityReview->agent_id === $request->user()->id, 403, 'فقط کارشناس ارزیابی‌شده می‌تواند تأیید کند.');
        $data = $request->validate(['agent_response' => 'nullable|string|max:2000']);
        $qualityReview->update(['status' => 'acknowledged', 'acknowledged_at' => now(), 'agent_response' => $data['agent_response'] ?? null]);
        ActivityLogger::log('quality_review_acknowledged', "Quality review {$qualityReview->id} acknowledged", $qualityReview);

        return response()->json($qualityReview->fresh());
    }

    private function scoreRules(bool $required = true): array
    {
        return collect(self::SCORE_FIELDS)->mapWithKeys(
            fn (string $field): array => [$field => ($required ? 'required' : 'sometimes').'|integer|min:0|max:100']
        )->all();
    }

    private function overallScore(array $data): int
    {
        return (int) round(collect(self::SCORE_FIELDS)->map(fn (string $field) => (int) $data[$field])->avg());
    }
}