<?php

namespace App\Services;

use App\Models\AnalyticsSession;
use App\Models\Goal;
use App\Models\GoalConversion;
use App\Models\Visitor;
use App\Models\Website;
use Illuminate\Support\Carbon;
use Illuminate\Support\Collection;

class GoalEvaluationService
{
    public function evaluate(
        Website $website,
        Visitor $visitor,
        AnalyticsSession $session,
        array $payload,
        Carbon $now,
    ): void {
        $goals = $website->goals()->where('is_active', true)->get();

        foreach ($goals as $goal) {
            if ($this->alreadyConverted($goal, $session)) {
                continue;
            }

            if ($this->matches($goal, $session, $payload)) {
                GoalConversion::create([
                    'goal_id' => $goal->id,
                    'website_id' => $website->id,
                    'visitor_id' => $visitor->id,
                    'analytics_session_id' => $session->id,
                    'value' => $goal->default_value,
                    'converted_at' => $now,
                ]);
            }
        }
    }

    private function alreadyConverted(Goal $goal, AnalyticsSession $session): bool
    {
        return GoalConversion::where('goal_id', $goal->id)
            ->where('analytics_session_id', $session->id)
            ->exists();
    }

    private function matches(Goal $goal, AnalyticsSession $session, array $payload): bool
    {
        return match ($goal->type) {
            'url_destination' => $this->matchesUrlDestination($goal, $payload),
            'event_match' => $this->matchesEvent($goal, $payload),
            'duration' => $this->matchesDuration($goal, $session),
            'pages_per_session' => $this->matchesPagesPerSession($goal, $session),
            default => false,
        };
    }

    private function matchesUrlDestination(Goal $goal, array $payload): bool
    {
        $conditions = $goal->conditions;
        $path = $payload['path'] ?? '';
        $targetPath = $conditions['path'] ?? '';
        $matchType = $conditions['match_type'] ?? 'exact';

        if (! $path || ! $targetPath) {
            return false;
        }

        return match ($matchType) {
            'exact' => $path === $targetPath,
            'starts_with' => str_starts_with($path, $targetPath),
            'contains' => str_contains($path, $targetPath),
            'regex' => (bool) @preg_match($targetPath, $path),
            default => false,
        };
    }

    private function matchesEvent(Goal $goal, array $payload): bool
    {
        if (($payload['type'] ?? '') !== 'event') {
            return false;
        }

        $conditions = $goal->conditions;
        $eventName = $conditions['event_name'] ?? '';

        if (! $eventName || ($payload['event_name'] ?? '') !== $eventName) {
            return false;
        }

        $requiredCategory = $conditions['event_category'] ?? null;
        if ($requiredCategory && ($payload['event_category'] ?? '') !== $requiredCategory) {
            return false;
        }

        return true;
    }

    private function matchesDuration(Goal $goal, AnalyticsSession $session): bool
    {
        $requiredSeconds = $goal->conditions['seconds'] ?? 0;

        return $session->duration >= $requiredSeconds;
    }

    private function matchesPagesPerSession(Goal $goal, AnalyticsSession $session): bool
    {
        $requiredPages = $goal->conditions['page_count'] ?? 0;

        return $session->pages_count >= $requiredPages;
    }
}