<?php
/**
 * RecurringTicketModel - Manages recurring ticket schedules
 */

class RecurringTicketModel {
    private $conn;

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

    /**
     * Get all recurring tickets
     */
    public function getAll($includeInactive = false) {
        $sql = "SELECT rt.*, u1.display_name as assigned_name, u1.username as assigned_username,
                       u2.display_name as creator_name, u2.username as creator_username
                FROM recurring_tickets rt
                LEFT JOIN users u1 ON rt.assigned_to = u1.user_id
                LEFT JOIN users u2 ON rt.created_by = u2.user_id";

        if (!$includeInactive) {
            $sql .= " WHERE rt.is_active = 1";
        }

        $sql .= " ORDER BY rt.next_run_at ASC";

        $result = $this->conn->query($sql);
        $items = [];
        while ($row = $result->fetch_assoc()) {
            $items[] = $row;
        }
        return $items;
    }

    /**
     * Get a single recurring ticket by ID
     */
    public function getById($recurringId) {
        $sql = "SELECT * FROM recurring_tickets WHERE recurring_id = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param('i', $recurringId);
        $stmt->execute();
        $result = $stmt->get_result();
        $row = $result->fetch_assoc();
        $stmt->close();
        return $row;
    }

    /**
     * Create a new recurring ticket
     */
    public function create($data) {
        $sql = "INSERT INTO recurring_tickets
                (title_template, description_template, category, type, priority, assigned_to,
                 schedule_type, schedule_day, schedule_time, next_run_at, is_active, created_by)
                VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";

        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param('ssssiiisssis',
            $data['title_template'],
            $data['description_template'],
            $data['category'],
            $data['type'],
            $data['priority'],
            $data['assigned_to'],
            $data['schedule_type'],
            $data['schedule_day'],
            $data['schedule_time'],
            $data['next_run_at'],
            $data['is_active'],
            $data['created_by']
        );

        if ($stmt->execute()) {
            $id = $this->conn->insert_id;
            $stmt->close();
            return ['success' => true, 'recurring_id' => $id];
        }

        $error = $stmt->error;
        $stmt->close();
        return ['success' => false, 'error' => $error];
    }

    /**
     * Update a recurring ticket
     */
    public function update($recurringId, $data) {
        $sql = "UPDATE recurring_tickets SET
                title_template = ?, description_template = ?, category = ?, type = ?,
                priority = ?, assigned_to = ?, schedule_type = ?, schedule_day = ?,
                schedule_time = ?, next_run_at = ?, is_active = ?
                WHERE recurring_id = ?";

        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param('ssssiissssii',
            $data['title_template'],
            $data['description_template'],
            $data['category'],
            $data['type'],
            $data['priority'],
            $data['assigned_to'],
            $data['schedule_type'],
            $data['schedule_day'],
            $data['schedule_time'],
            $data['next_run_at'],
            $data['is_active'],
            $recurringId
        );

        $success = $stmt->execute();
        $stmt->close();
        return ['success' => $success];
    }

    /**
     * Delete a recurring ticket
     */
    public function delete($recurringId) {
        $sql = "DELETE FROM recurring_tickets WHERE recurring_id = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param('i', $recurringId);
        $success = $stmt->execute();
        $stmt->close();
        return ['success' => $success];
    }

    /**
     * Get recurring tickets due for execution
     */
    public function getDueRecurringTickets() {
        $sql = "SELECT * FROM recurring_tickets WHERE is_active = 1 AND next_run_at <= NOW()";
        $result = $this->conn->query($sql);
        $items = [];
        while ($row = $result->fetch_assoc()) {
            $items[] = $row;
        }
        return $items;
    }

    /**
     * Update last run and calculate next run time
     */
    public function updateAfterRun($recurringId) {
        $recurring = $this->getById($recurringId);
        if (!$recurring) {
            return false;
        }

        $nextRun = $this->calculateNextRunTime(
            $recurring['schedule_type'],
            $recurring['schedule_day'],
            $recurring['schedule_time']
        );

        $sql = "UPDATE recurring_tickets SET last_run_at = NOW(), next_run_at = ? WHERE recurring_id = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param('si', $nextRun, $recurringId);
        $success = $stmt->execute();
        $stmt->close();
        return $success;
    }

    /**
     * Calculate the next run time based on schedule
     */
    private function calculateNextRunTime($scheduleType, $scheduleDay, $scheduleTime) {
        $now = new DateTime();
        $time = new DateTime($scheduleTime);

        switch ($scheduleType) {
            case 'daily':
                $next = new DateTime('tomorrow ' . $scheduleTime);
                break;

            case 'weekly':
                $dayName = ['', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'][$scheduleDay] ?? 'Monday';
                $next = new DateTime("next {$dayName} " . $scheduleTime);
                break;

            case 'monthly':
                $day = max(1, min(28, $scheduleDay)); // Limit to 28 for safety
                $next = new DateTime();
                $next->modify('first day of next month');
                $next->setDate($next->format('Y'), $next->format('m'), $day);
                $next->setTime($time->format('H'), $time->format('i'), 0);
                break;

            default:
                $next = new DateTime('tomorrow ' . $scheduleTime);
        }

        return $next->format('Y-m-d H:i:s');
    }

    /**
     * Toggle active status
     */
    public function toggleActive($recurringId) {
        $sql = "UPDATE recurring_tickets SET is_active = NOT is_active WHERE recurring_id = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param('i', $recurringId);
        $success = $stmt->execute();
        $stmt->close();
        return ['success' => $success];
    }
}
?>