// ============================================================
//  PdfBridge:报价插件(Form3)与 PDF 查看器之间的桥
//  与 cadbt 的 CadBridge 保持相同的 API 形状:
//  · 下行(Form3→查看器):SendPaCommand / ZoomToFrameHandle /
//    DeleteFramesByHandles / MergeMasks / ClearHighlight
//  · 上行(查看器→Form3):PaPicked / EntityErased / PaExited /
//    F1/F2/F3Requested
//  扒图逻辑:用户在 PDF 上框选 → 裁剪 → OCR 工作进程识别 →
//  按 CAD 版语义组装 results(正向逐条/反向合并) → PaPicked
//  → Form3 入表格;查看器在框选位置画彩色蒙版框。
// ============================================================
using System;
using System.Collections.Generic;

namespace pdfbt
{
    public static class PdfBridge
    {
        private static PdfViewerWindow _viewer;

        /// <summary>PDF 查看器是否已挂载且打开了文档。</summary>
        public static bool IsViewerReady
        {
            get { return _viewer != null && _viewer.IsDocumentOpen; }
        }

        /// <summary>扒图连续模式当前是否激活(供 ESC 全局过滤判断)。</summary>
        public static bool PickModeActive
        {
            get { return _viewer != null && _viewer.PickModeActive; }
        }

        /// <summary>兼容 CadBridge:查看器中蒙版被外部删除(当前无触发源,保留事件形状)。</summary>
        public static event Action<string> EntityErased;

        /// <summary>框选识别完成一批(图号/箱号/元件)。</summary>
        public static event Action<MyApp.PaMode, List<MyApp.PaTextResult>> PaPicked;

        /// <summary>用户按 ESC 退出连续扒图模式。</summary>
        public static event Action PaExited;

        /// <summary>用户按 F1 —— 元件两两合并。</summary>
        public static event Action F1Requested;

        /// <summary>用户按 F2 —— 元件三个一组合并。</summary>
        public static event Action F2Requested;

        /// <summary>用户按 F3 —— 元件四个一组合并。</summary>
        public static event Action F3Requested;

        /// <summary>把 PDF 查看器挂到桥上(查看器构造时调用一次)。</summary>
        public static void Attach(PdfViewerWindow viewer)
        {
            _viewer = viewer;
        }

        // ------------------------------------------------------------
        //  查看器 → Form3 的上行事件触发(仅查看器调用)
        // ------------------------------------------------------------

        public static void RaisePaPicked(MyApp.PaMode mode, List<MyApp.PaTextResult> results)
        {
            if (PaPicked != null) PaPicked(mode, results);
        }

        public static void RaisePaExited()
        {
            if (PaExited != null) PaExited();
        }

        public static void RaiseEntityErased(string handle)
        {
            if (!string.IsNullOrWhiteSpace(handle) && EntityErased != null)
                EntityErased(handle);
        }

        public static void RaiseF1() { if (F1Requested != null) F1Requested(); }
        public static void RaiseF2() { if (F2Requested != null) F2Requested(); }
        public static void RaiseF3() { if (F3Requested != null) F3Requested(); }

        // ------------------------------------------------------------
        //  Form3 → 查看器的下行命令
        // ------------------------------------------------------------

        /// <summary>
        /// 发送扒图命令。接受原 CAD 命令名(CADPATU/CADPAXH/CADPAYJ/CADPACL)
        /// 或网页命令名(patu/paxh/payj/pacl)。
        /// </summary>
        public static void SendPaCommand(string cmd)
        {
            if (string.IsNullOrWhiteSpace(cmd)) return;
            string c = cmd.Trim().ToUpperInvariant();
            int mode = 0;
            if (c == "CADPATU" || c == "PATU") mode = 0;
            else if (c == "CADPAXH" || c == "PAXH") mode = 1;
            else if (c == "CADPAYJ" || c == "PAYJ") mode = 2;
            else if (c == "CADPACL" || c == "PACL")
            {
                ClearHighlight();
                return;
            }
            else return;

            if (_viewer == null) return;
            _viewer.StartPick(mode);
        }

        /// <summary>定位到指定 Handle 的蒙版框(点击表格行定位)。</summary>
        public static void ZoomToFrameHandle(string handle)
        {
            if (string.IsNullOrWhiteSpace(handle) || _viewer == null) return;
            _viewer.ZoomToFrame(handle);
        }

        /// <summary>批量删除指定 Handle 的蒙版(删表格行联动删框)。</summary>
        public static void DeleteFramesByHandles(IEnumerable<string> handles)
        {
            if (handles == null || _viewer == null) return;
            var list = new List<string>();
            foreach (string h in handles)
                if (!string.IsNullOrWhiteSpace(h)) list.Add(h);
            if (list.Count == 0) return;
            _viewer.DeleteFrames(list);
        }

        /// <summary>
        /// 合并蒙版:保留 keep 的蒙版并扩大到所有 removes 蒙版的并集,
        /// 被合并行的蒙版移除(元件合并时蒙版同步合并)。
        /// </summary>
        public static void MergeMasks(string keep, IEnumerable<string> removes)
        {
            if (string.IsNullOrWhiteSpace(keep) || _viewer == null) return;
            var list = new List<string>();
            if (removes != null)
                foreach (string h in removes)
                    if (!string.IsNullOrWhiteSpace(h) && h != keep) list.Add(h);
            if (list.Count == 0) return;
            _viewer.MergeMasks(keep, list);
        }

        /// <summary>清除所有高亮。</summary>
        public static void ClearHighlight()
        {
            if (_viewer == null) return;
            _viewer.ClearHighlight();
        }
    }
}