<?php
// models/Setting.php
require_once dirname(__DIR__) . '/config/database.php';

class Setting {
    private $conn;
    private $table_name = "settings";

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

    /**
     * ดึงค่า setting ตัวเดียว โดยใช้ key
     */
    public function get($key, $default = null) {
        $query = "SELECT setting_value FROM " . $this->table_name . " WHERE setting_key = :key LIMIT 1";
        $stmt = $this->conn->prepare($query);
        $stmt->bindParam(':key', $key);
        $stmt->execute();

        if ($stmt->rowCount() > 0) {
            $row = $stmt->fetch();
            return $row['setting_value'];
        }
        return $default;
    }

    /**
     * ตั้งค่า setting ตัวเดียว โดยใช้ key
     */
    public function set($key, $value) {
        // เช็คว่ามี key นี้อยู่หรือไม่
        $check_query = "SELECT id FROM " . $this->table_name . " WHERE setting_key = :key LIMIT 1";
        $check_stmt = $this->conn->prepare($check_query);
        $check_stmt->bindParam(':key', $key);
        $check_stmt->execute();

        if ($check_stmt->rowCount() > 0) {
            $query = "UPDATE " . $this->table_name . " SET setting_value = :value WHERE setting_key = :key";
            $stmt = $this->conn->prepare($query);
            $stmt->bindParam(':key', $key);
            $stmt->bindParam(':value', $value);
        } else {
            // สมมติ category เป็น 'general' และ label ให้เท่ากับ key สำหรับค่าใหม่ (ถ้ามี)
            $query = "INSERT INTO " . $this->table_name . " (setting_key, setting_value, category, label) VALUES (:key, :value, 'general', :label)";
            $stmt = $this->conn->prepare($query);
            $stmt->bindParam(':key', $key);
            $stmt->bindParam(':value', $value);
            $stmt->bindParam(':label', $key);
        }
        
        return $stmt->execute();
    }

    /**
     * ดึงค่า setting ทั้งหมด โดยแบ่งตาม category
     */
    public function getAllByCategory() {
        $query = "SELECT * FROM " . $this->table_name . " ORDER BY category, id";
        $stmt = $this->conn->prepare($query);
        $stmt->execute();
        
        $results = [];
        while ($row = $stmt->fetch()) {
            $cat = $row['category'];
            if (!isset($results[$cat])) {
                $results[$cat] = [];
            }
            $results[$cat][] = $row;
        }
        return $results;
    }

    /**
     * ดึงค่า setting ทั้งหมดแบบ Flat Array (key => value)
     */
    public function getAllFlat() {
        $query = "SELECT setting_key, setting_value FROM " . $this->table_name;
        $stmt = $this->conn->prepare($query);
        $stmt->execute();
        
        $results = [];
        while ($row = $stmt->fetch()) {
            $results[$row['setting_key']] = $row['setting_value'];
        }
        return $results;
    }

    /**
     * ดึงค่า setting ทั้งหมด โดยจัดกลุ่มเป็น associative array: category => [key => value]
     */
    public function getAllGrouped() {
        $query = "SELECT * FROM " . $this->table_name;
        $stmt = $this->conn->prepare($query);
        $stmt->execute();
        
        $results = [];
        while ($row = $stmt->fetch()) {
            $cat = $row['category'];
            $key = $row['setting_key'];
            $val = $row['setting_value'];
            
            if (!isset($results[$cat])) {
                $results[$cat] = [];
            }
            $results[$cat][$key] = $val;
        }
        return $results;
    }

    /**
     * ดึงค่า setting เฉพาะกลุ่ม (Category) แบบ Associative Array
     */
    public function getGroup($category) {
        $query = "SELECT setting_key, setting_value FROM " . $this->table_name . " WHERE category = :cat";
        $stmt = $this->conn->prepare($query);
        $stmt->bindParam(':cat', $category);
        $stmt->execute();
        
        $results = [];
        while ($row = $stmt->fetch()) {
            $results[$row['setting_key']] = $row['setting_value'];
        }
        
        // If empty, let's also try to fetch from flat array just in case it was inserted into 'general'
        // This makes it backwards compatible with newly inserted settings.
        if (empty($results)) {
            $flat = $this->getAllFlat();
            return $flat;
        }
        
        return $results;
    }

    /**
     * อัปเดตค่า setting หลายตัวพร้อมกัน
     */
    public function updateBulk($settings_array) {
        $query = "UPDATE " . $this->table_name . " SET setting_value = :val WHERE setting_key = :key";
        $stmt = $this->conn->prepare($query);

        $this->conn->beginTransaction();
        try {
            foreach ($settings_array as $key => $val) {
                $stmt->bindValue(':val', $val);
                $stmt->bindValue(':key', $key);
                $stmt->execute();
            }
            $this->conn->commit();
            return true;
        } catch (Exception $e) {
            $this->conn->rollBack();
            return false;
        }
    }
}