<?php

declare(strict_types=1);

namespace App\Modules\Retribusi\Summary;

use PDO;
use PDOException;

class DailySummaryService
{
    private PDO $db;

    public function __construct(PDO $db)
    {
        $this->db = $db;
    }

    /**
     * Aggregate daily summary for a specific date
     *
     * @param string $date Format: Y-m-d
     * @return array ['rows_processed' => int, 'date' => string]
     * @throws PDOException
     */
    public function aggregateForDate(string $date): array
    {
        // Validate date format
        $dateTime = \DateTime::createFromFormat('Y-m-d', $date);
        if ($dateTime === false || $dateTime->format('Y-m-d') !== $date) {
            throw new \InvalidArgumentException('Invalid date format. Expected Y-m-d');
        }

        $this->db->beginTransaction();

        try {
            // Aggregate from entry_events
            // Only count events from active locations, gates, and tariffs
            $sql = "
                SELECT 
                    DATE(e.event_time) as summary_date,
                    e.location_code,
                    e.gate_code,
                    e.category,
                    COUNT(*) as total_count,
                    COALESCE(t.amount, 0) as tariff_amount
                FROM entry_events e
                INNER JOIN locations l ON e.location_code = l.code AND l.is_active = 1
                INNER JOIN gates g ON e.location_code = g.location_code 
                    AND e.gate_code = g.gate_code 
                    AND g.is_active = 1
                LEFT JOIN tariffs t ON e.location_code = t.location_code
                    AND e.gate_code = t.gate_code
                    AND e.category = t.category
                WHERE DATE(e.event_time) = ?
                GROUP BY 
                    DATE(e.event_time),
                    e.location_code,
                    e.gate_code,
                    e.category,
                    COALESCE(t.amount, 0)
            ";

            $stmt = $this->db->prepare($sql);
            $stmt->execute([$date]);
            $aggregated = $stmt->fetchAll();

            $rowsProcessed = 0;

            // Upsert to daily_summary
            $upsertSql = "
                INSERT INTO daily_summary 
                    (summary_date, location_code, gate_code, category, total_count, total_amount, created_at, updated_at)
                VALUES (?, ?, ?, ?, ?, ?, NOW(), NOW())
                ON DUPLICATE KEY UPDATE
                    total_count = VALUES(total_count),
                    total_amount = VALUES(total_amount),
                    updated_at = NOW()
            ";

            $upsertStmt = $this->db->prepare($upsertSql);

            foreach ($aggregated as $row) {
                $totalAmount = (int) $row['total_count'] * (int) $row['tariff_amount'];

                $upsertStmt->execute([
                    $row['summary_date'],
                    $row['location_code'],
                    $row['gate_code'],
                    $row['category'],
                    (int) $row['total_count'],
                    $totalAmount
                ]);

                $rowsProcessed++;
            }

            $this->db->commit();

            return [
                'rows_processed' => $rowsProcessed,
                'date' => $date
            ];

        } catch (PDOException $e) {
            $this->db->rollBack();
            throw $e;
        }
    }

    /**
     * Get daily summary data
     *
     * @param string $date
     * @param string|null $locationCode
     * @param string|null $gateCode
     * @return array
     * @throws PDOException
     */
    public function getDailySummary(
        string $date,
        ?string $locationCode = null,
        ?string $gateCode = null
    ): array {
        $sql = "
            SELECT 
                summary_date,
                location_code,
                gate_code,
                category,
                total_count,
                total_amount
            FROM daily_summary
            WHERE summary_date = ?
        ";

        $params = [$date];

        if ($locationCode !== null) {
            $sql .= " AND location_code = ?";
            $params[] = $locationCode;
        }

        if ($gateCode !== null) {
            $sql .= " AND gate_code = ?";
            $params[] = $gateCode;
        }

        $sql .= " ORDER BY location_code, gate_code, category";

        $stmt = $this->db->prepare($sql);
        $stmt->execute($params);

        return $stmt->fetchAll();
    }
}