if (!defined('ABSPATH')) {
    exit;
}

// 驗證權限與 Nonce
function qc_pos_verify_ajax_request() {
    check_ajax_referer('qc_pos_nonce', 'nonce');
    if (!current_user_can('manage_options')) {
        wp_send_json_error(array('message' => '無存取權限'), 403);
    }
}

// 1. 建立現場銷售單 (POS Direct Checkout)
add_action('wp_ajax_qc_pos_create_pos_order', 'qc_pos_create_pos_order_handler');
function qc_pos_create_pos_order_handler() {
    qc_pos_verify_ajax_request();

    if (!class_exists('WooCommerce')) {
        wp_send_json_error(array('message' => 'WooCommerce 未啟用'));
    }

    $pickup_date  = sanitize_text_field($_POST['pickup_date'] ?? '');
    $total_amount = intval($_POST['total_amount'] ?? 0);
    $payment_method_title = isset($_POST['payment_method_title']) ? sanitize_text_field($_POST['payment_method_title']) : '現場付款';
    $items_raw    = $_POST['items'] ?? '';
    $items        = json_decode(stripslashes($items_raw), true);

    // 現場銷售若日期缺失，預設為今日
    if (empty($pickup_date)) {
        $pickup_date = current_time('Y-m-d');
    }

    if (empty($items)) {
        wp_send_json_error(array('message' => '資料不完整：缺少品項或格式錯誤'));
    }

    try {
        $order = wc_create_order();
        
        foreach ($items as $item) {
            $order->add_product(wc_get_product($item['product_id']), $item['quantity']);
        }

        // 現場銷售固定屬性
        $order->set_address(array(
            'first_name' => '現場',
            'phone'      => '0900000000',
        ), 'billing');

        // 設定付款方式
        $order->set_payment_method('cod');
        $order->set_payment_method_title($payment_method_title);

        $order->calculate_totals();
        
        // 寫入 Metadata 
        $utc_timestamp = strtotime($pickup_date . ' UTC');
        $order->update_meta_data('_orddd_lite_timestamp', (string) $utc_timestamp);
        $order->update_meta_data('自取日期', $pickup_date);
        $order->update_meta_data('_custom_order_source', 'instore_direct');

        // 現場銷售狀態直接設為已完成
        $order->update_status('completed');
        $order->save();

        wp_send_json_success(array(
            'message' => '結帳成功，已建立 WooCommerce 訂單',
            'order_id' => $order->get_id()
        ));

    } catch (Exception $e) {
        wp_send_json_error(array('message' => '寫入 WooCommerce 失敗: ' . $e->getMessage()));
    }
}

// 2. 建立 WooCommerce 預購單
add_action('wp_ajax_qc_pos_create_woo_order', 'qc_pos_create_woo_order_handler');
function qc_pos_create_woo_order_handler() {
    qc_pos_verify_ajax_request();

    if (!class_exists('WooCommerce')) {
        wp_send_json_error(array('message' => 'WooCommerce 未啟用'));
    }

    $last_name = sanitize_text_field($_POST['last_name']);
    $first_name = sanitize_text_field($_POST['first_name']);
    $phone = sanitize_text_field($_POST['phone']);
    $pickup_date = sanitize_text_field($_POST['pickup_date']);
    $order_source = sanitize_text_field($_POST['order_source']);
    $customer_note = sanitize_textarea_field($_POST['customer_note']);
    $items = json_decode(stripslashes($_POST['items']), true);

    if (empty($first_name) || empty($phone) || empty($pickup_date) || empty($order_source) || empty($items)) {
        wp_send_json_error(array('message' => '必填欄位缺失'));
    }

    try {
        $order = wc_create_order();
        
        foreach ($items as $item) {
            $order->add_product(wc_get_product($item['product_id']), $item['quantity']);
        }

        $order->set_billing_last_name($last_name);
        $order->set_billing_first_name($first_name);
        $order->set_billing_phone($phone);
        if (!empty($customer_note)) {
            $order->set_customer_note($customer_note);
        }

        // 設定付款方式：現場付款 (Cash on delivery)
        $order->set_payment_method('cod');
        $order->set_payment_method_title('現場付款');

        $order->calculate_totals();
        $order->set_status('processing', 'POS 儀表板建單');

        // 寫入 Metadata 
        $utc_timestamp = strtotime($pickup_date . ' UTC');
        $order->update_meta_data('_orddd_lite_timestamp', (string) $utc_timestamp);
        $order->update_meta_data('自取日期', $pickup_date);
        $order->update_meta_data('_custom_order_source', $order_source);

        $order->save();

        wp_send_json_success(array(
            'message' => '訂單建立成功',
            'order_id' => $order->get_id()
        ));

    } catch (Exception $e) {
        wp_send_json_error(array('message' => 'WooCommerce 訂單建立失敗: ' . $e->getMessage()));
    }
}

// 3. 取得儀表板資料 (透過 WooCommerce API 查詢)
add_action('wp_ajax_qc_pos_get_dashboard_data', 'qc_pos_get_dashboard_data_handler');
function qc_pos_get_dashboard_data_handler() {
    qc_pos_verify_ajax_request();

    if (!class_exists('WooCommerce')) {
        wp_send_json_error(array('message' => 'WooCommerce 未啟用'));
    }

    $date = sanitize_text_field($_GET['date']);
    if (empty($date)) {
        $date = current_time('Y-m-d');
    }
    
    $status = isset($_GET['status']) ? sanitize_text_field($_GET['status']) : 'processing';

    $orders_data = array();
    
    $target_timestamp = strtotime($date . ' UTC');
    $args = array(
        'status' => $status,
        'limit'  => -1,
        'meta_key'   => '_orddd_lite_timestamp',
        'meta_value' => (string) $target_timestamp,
        'meta_compare' => '=',
        'orderby' => 'ID',
        'order'   => 'ASC'
    );
    
    $woo_orders = wc_get_orders($args);

    foreach ($woo_orders as $order) {
        $items_formatted = array();
        foreach ($order->get_items() as $item_id => $item) {
            $items_formatted[] = array(
                'name' => $item->get_name(),
                'quantity' => $item->get_quantity(),
                'price' => $item->get_subtotal() / max(1, $item->get_quantity())
            );
        }

        $source = $order->get_meta('_custom_order_source');
        if (empty($source)) $source = 'website';

        $orders_data[] = array(
            'id' => $order->get_id(),
            'status' => $status,
            'customer_name' => trim($order->get_billing_last_name() . ' ' . $order->get_billing_first_name()),
            'phone' => $order->get_billing_phone(),
            'source' => $source,
            'total' => (float)$order->get_total(),
            'pickup_date' => $order->get_meta('自取日期') ? $order->get_meta('自取日期') : gmdate('Y-m-d', (int)$order->get_meta('_orddd_lite_timestamp')),
            'items' => $items_formatted,
            'customer_note' => $order->get_customer_note(),
            'payment_method' => $order->get_payment_method()
        );
    }

    $stats_args = array(
        'status' => array('processing', 'completed'),
        'limit'  => -1,
        'meta_key'   => '_orddd_lite_timestamp',
        'meta_value' => (string) $target_timestamp,
        'meta_compare' => '='
    );
    
    $stats_orders = wc_get_orders($stats_args);
    $stats = array('order_count' => count($stats_orders), 'total_revenue' => 0);
    foreach ($stats_orders as $o) {
        $stats['total_revenue'] += (float)$o->get_total();
    }

    wp_send_json_success(array(
        'data' => $orders_data,
        'stats' => $stats
    ));
}

// =========================================================
// 4. Dashboard 統計總覽 API（圓餅圖 + 趨勢折線圖資料源）
// =========================================================

/**
 * AJAX Action: qc_pos_get_stats_overview
 *
 * 職責：
 *   接收前端指定的日期範圍，查詢該區間內所有有效訂單（processing + completed），
 *   彙整兩種統計維度後回傳：
 *   1. source_breakdown — 各訂單來源的營業額合計（供圓餅圖使用）
 *   2. daily_trend      — 以「自取日期」為鍵的每日營業額（供折線圖使用）
 *
 * 由 dashboard-charts.js 的 fetchOverview() 透過 GET 請求呼叫。
 *
 * 查詢參數：
 *   date_from  YYYY-MM-DD  查詢起始日（含）
 *   date_to    YYYY-MM-DD  查詢結束日（含）
 *   nonce      string      WordPress nonce，防 CSRF 攻擊
 *
 * 訂單查詢邏輯：
 *   使用 wc_get_orders() 搭配 meta_key = _orddd_lite_timestamp，
 *   以 BETWEEN 條件比對 UTC 午夜時間戳記。
 *   例：date_from='2026-04-21' → from_ts=1745193600
 *      date_to  ='2026-04-23' → to_ts  =1745366400
 *   查詢結果包含自取日期落在此區間的所有 processing + completed 訂單。
 *
 * 訂單來源判斷規則（_custom_order_source meta）：
 *   fb_msg           → 'FB'
 *   ig_msg           → 'IG'
 *   website          → '官網'
 *   instore_preorder → '現場'（與 instore_direct 合計）
 *   instore_direct   → '現場'（與 instore_preorder 合計）
 *   空值（官網前台下單）→ fallback 視為 'website' → '官網'
 *   其他未知值       → '其他'
 *
 * 成功回傳格式：
 * {
 *   "success": true,
 *   "data": {
 *     "source_breakdown": { "FB": 1200, "官網": 3400 },  // 已過濾 revenue=0 的來源
 *     "daily_trend":      { "2026-04-21": 800, ... },    // 已 ksort 升冪排列
 *     "total_revenue":    4600,
 *     "order_count":      15
 *   }
 * }
 *
 * 對應前端：assets/js/dashboard-charts.js → fetchOverview()
 */
add_action('wp_ajax_qc_pos_get_stats_overview', 'qc_pos_get_stats_overview_handler');
function qc_pos_get_stats_overview_handler() {
    qc_pos_verify_ajax_request();

    if (!class_exists('WooCommerce')) {
        wp_send_json_error(array('message' => 'WooCommerce 未啟用'));
    }

    $date_from = sanitize_text_field($_GET['date_from'] ?? '');
    $date_to   = sanitize_text_field($_GET['date_to']   ?? '');

    if (empty($date_from) || empty($date_to)) {
        wp_send_json_error(array('message' => '日期範圍缺失'));
    }

    // 將日期字串轉為 UTC 午夜時間戳記
    // _orddd_lite_timestamp 儲存的是「自取日期當天 UTC 00:00」的 Unix 時間戳記，
    // 例如 2026-04-21 → 1745193600（strtotime('2026-04-21 UTC')）
    $from_ts = strtotime($date_from . ' UTC');
    $to_ts   = strtotime($date_to   . ' UTC');

    if ($from_ts > $to_ts) {
        wp_send_json_error(array('message' => '起始日期不可大於結束日期'));
    }

    // 使用 BETWEEN 查詢此時間戳記區間的所有訂單
    // meta_type = NUMERIC 確保資料庫以數字型態比較，避免字串排序錯誤
    $args = array(
        'status'       => array('processing', 'completed'),
        'limit'        => -1,
        'meta_key'     => '_orddd_lite_timestamp',
        'meta_value'   => array((string)$from_ts, (string)$to_ts),
        'meta_compare' => 'BETWEEN',
        'meta_type'    => 'NUMERIC',
    );

    $orders = wc_get_orders($args);

    // 來源代碼到顯示標籤的映射表
    // instore_preorder 與 instore_direct 合計為同一個「現場」分類，
    // 因為從報表角度兩者都屬「門市實體接觸」，業主無需再細分
    $source_map = array(
        'fb_msg'           => 'FB',
        'ig_msg'           => 'IG',
        'website'          => '官網',
        'instore_preorder' => '現場',
        'instore_direct'   => '現場',
    );

    // 初始化各來源的營業額累計，保持固定順序（圓餅圖色彩一致）
    $source_revenue = array(
        'FB'   => 0,
        'IG'   => 0,
        '官網' => 0,
        '現場' => 0,
        '其他' => 0,
    );

    $daily_revenue = array(); // 'YYYY-MM-DD' => float，統計每個自取日期的營業額

    foreach ($orders as $order) {
        $total      = (float) $order->get_total();
        $source_raw = $order->get_meta('_custom_order_source');

        // 邊界案例：官網前台下單不會寫入 _custom_order_source meta，
        // empty($source_raw) 時必須 fallback 為 'website'，
        // 否則會因為空字串在 $source_map 中找不到而落入「其他」
        if (empty($source_raw)) $source_raw = 'website';

        $pickup_date = $order->get_meta('自取日期');

        // 邊界案例：若訂單未寫入「自取日期」字串 meta（舊格式訂單），
        // 改從 _orddd_lite_timestamp 的 Unix 時間戳記轉換
        if (empty($pickup_date)) {
            $ts = (int) $order->get_meta('_orddd_lite_timestamp');
            $pickup_date = $ts ? gmdate('Y-m-d', $ts) : '';
        }

        // 累計來源營業額
        $group = $source_map[$source_raw] ?? '其他';
        $source_revenue[$group] += $total;

        // 累計日期趨勢（以自取日期為 key）
        if (!empty($pickup_date)) {
            $daily_revenue[$pickup_date] = ($daily_revenue[$pickup_date] ?? 0) + $total;
        }
    }

    // 依自取日期升冪排序，確保折線圖 X 軸時序正確
    ksort($daily_revenue);

    // 過濾掉營業額為 0 的來源，避免圓餅圖出現「幽靈扇形」
    $source_revenue_filtered = array_filter($source_revenue, fn($v) => $v > 0);

    wp_send_json_success(array(
        'source_breakdown' => $source_revenue_filtered,
        'daily_trend'      => $daily_revenue,
        'total_revenue'    => array_sum($source_revenue_filtered),
        'order_count'      => count($orders),
    ));
}

// 5. 取得最新商品列表
add_action('wp_ajax_qc_pos_get_products', 'qc_pos_get_products_handler');
function qc_pos_get_products_handler() {
    qc_pos_verify_ajax_request();

    if (!class_exists('WooCommerce')) {
        wp_send_json_error(array('message' => 'WooCommerce 未啟用'));
    }

    $products_data = array();
    $args = array(
        'status' => 'publish',
        'limit'  => -1,
    );
    $products = wc_get_products($args);
    foreach ($products as $product) {
        $image_url = wp_get_attachment_image_url($product->get_image_id(), 'thumbnail');
        if (!$image_url) {
            $image_url = wc_placeholder_img_src('thumbnail');
        }

        $products_data[] = array(
            'id'    => $product->get_id(),
            'name'  => $product->get_name(),
            'price' => (float) $product->get_price(),
            'image' => $image_url,
            'stock' => $product->managing_stock() ? $product->get_stock_quantity() : null
        );
    }

    wp_send_json_success($products_data);
}

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