<?php

namespace adrienpayet\analytics;

use Kirby\Data\Yaml;
use Kirby\Toolkit\F;

class AnalyticsStore
{
    private static function getFilePath(): string
    {
        return kirby()->root('content') . '/analytics/visits.yml';
    }

    private static function ensureFileExists(): void
    {
        $filePath = self::getFilePath();
        $dirPath = dirname($filePath);

        if (!is_dir($dirPath)) {
            F::mkdir($dirPath, true);
        }

        if (!F::exists($filePath)) {
            F::write($filePath, Yaml::encode(['visits' => []]));
        }
    }

    public static function addVisit(Visit $visit): void
    {
        self::ensureFileExists();

        $filePath = self::getFilePath();
        $data = Yaml::decode(F::read($filePath));

        $visits = $data['visits'] ?? [];
        $visits[] = $visit->toArray();

        // Limiter à 10000 visites max
        if (count($visits) > 10000) {
            $visits = array_slice($visits, -10000);
        }

        $data['visits'] = $visits;
        F::write($filePath, Yaml::encode($data));
    }

    public static function getVisits(array $filters = []): array
    {
        self::ensureFileExists();

        $filePath = self::getFilePath();
        $data = Yaml::decode(F::read($filePath));
        $visits = $data['visits'] ?? [];

        // Convertir en objets Visit
        $visits = array_map(fn($v) => Visit::fromArray($v), $visits);

        // Filtrer par daterange
        if (!empty($filters['startDate']) || !empty($filters['endDate'])) {
            $visits = array_filter($visits, function($visit) use ($filters) {
                $timestamp = strtotime($visit->timestamp);

                if (!empty($filters['startDate'])) {
                    $startDate = strtotime($filters['startDate'] . ' 00:00:00');
                    if ($timestamp < $startDate) {
                        return false;
                    }
                }

                if (!empty($filters['endDate'])) {
                    $endDate = strtotime($filters['endDate'] . ' 23:59:59');
                    if ($timestamp > $endDate) {
                        return false;
                    }
                }

                return true;
            });
        }

        // Filtrer par projet
        if (!empty($filters['project'])) {
            $projectId = $filters['project'];
            $visits = array_filter($visits, function($visit) use ($projectId) {
                return str_contains($visit->pageUrl, "/projects/{$projectId}");
            });
        }

        // Filtrer par email (permissions)
        if (!empty($filters['emails'])) {
            $allowedEmails = $filters['emails'];
            $visits = array_filter($visits, function($visit) use ($allowedEmails) {
                return in_array($visit->email, $allowedEmails);
            });
        }

        // Filtrer par nom de page
        if (!empty($filters['pageNames'])) {
            $pageNames = $filters['pageNames'];
            $visits = array_filter($visits, function($visit) use ($pageNames) {
                $name = $visit->pageName ?: $visit->pageUrl;
                return in_array($name, $pageNames);
            });
        }

        return array_values($visits);
    }

    public static function getAggregatedData(array $filters = []): array
    {
        self::ensureFileExists();

        // Visits sans filtre pageNames → pour construire la liste des pages (options)
        $filtersWithoutPages = $filters;
        unset($filtersWithoutPages['pageNames']);
        $allVisits = self::getVisits($filtersWithoutPages);

        $visitsByPage = [];
        foreach ($allVisits as $visit) {
            $page = $visit->pageName ?: $visit->pageUrl;
            $visitsByPage[$page] = ($visitsByPage[$page] ?? 0) + 1;
        }
        arsort($visitsByPage);

        // Visits avec tous les filtres → pour les stats affichées
        $visits = !empty($filters['pageNames'])
            ? self::getVisits($filters)
            : $allVisits;

        $visitsByDay = [];
        foreach ($visits as $visit) {
            $day = date('Y-m-d', strtotime($visit->timestamp));
            $visitsByDay[$day] = ($visitsByDay[$day] ?? 0) + 1;
        }
        ksort($visitsByDay);

        $uniqueSessions = count(array_unique(array_map(fn($v) => $v->sessionId, $visits)));

        // Visites par jour par page (top 10 pages)
        $topPages = array_keys(array_slice($visitsByPage, 0, 10, true));
        $visitsByDayByPage = [];
        foreach ($visits as $visit) {
            $page = $visit->pageName ?: $visit->pageUrl;
            if (!in_array($page, $topPages)) continue;
            $day = date('Y-m-d', strtotime($visit->timestamp));
            $visitsByDayByPage[$page][$day] = ($visitsByDayByPage[$page][$day] ?? 0) + 1;
        }
        foreach ($visitsByDayByPage as &$days) {
            ksort($days);
        }

        return [
            'totalVisits' => count($visits),
            'uniqueSessions' => $uniqueSessions,
            'visitsByDay' => $visitsByDay,
            'visitsByPage' => array_slice($visitsByPage, 0, 10, true),
            'visitsByDayByPage' => $visitsByDayByPage,
        ];
    }
}