import { useState } from "react";
import { useQuery, useQueryClient } from "@tanstack/react-query";
import { open } from "@tauri-apps/plugin-dialog";
import { batchCreateProjects, getSpaces, scanSubfolders, type SubFolder } from "../../lib/commands";
import { useUIStore } from "../../store/ui";
import { Dialog } from "../ui/Dialog";

// Windows 路径转 WSL 路径（仅 /mnt/x/... 形式，不处理 UNC）
function winToWsl(p: string): string {
  const norm = p.replace(/\\/g, "/");
  const m = norm.match(/^([a-zA-Z]):\/(.*)$/);
  return m ? `/mnt/${m[1].toLowerCase()}/${m[2]}` : norm;
}

type PathMode = "win" | "wsl_convert" | "wsl_manual";

interface FolderItem extends SubFolder {
  checked: boolean;
  customId: string;   // 可编辑的 id
  customName: string; // 可编辑的显示名
}

export function BatchAddModal({ onClose }: { onClose: () => void }) {
  const showToast = useUIStore((s) => s.showToast);
  const qc = useQueryClient();

  const { data: spaces = [] } = useQuery({ queryKey: ["spaces"], queryFn: getSpaces });
  const currentSpace = spaces.find((s) => s.is_current);

  const [parentPath, setParentPath] = useState("");
  const [pathMode, setPathMode] = useState<PathMode>("win");
  const [items, setItems] = useState<FolderItem[]>([]);
  const [scanning, setScanning] = useState(false);
  const [saving, setSaving] = useState(false);

  // 公共字段
  const [commonStatus, setCommonStatus] = useState("active");
  const [commonPriority, setCommonPriority] = useState("mid");

  const pickFolder = async () => {
    const selected = await open({ directory: true, multiple: false });
    if (!selected) return;
    setParentPath(selected as string);
    setItems([]);
  };

  const scan = async () => {
    if (!parentPath.trim()) { showToast("❌ 请先选择父目录"); return; }
    setScanning(true);
    try {
      const folders = await scanSubfolders(parentPath.trim());
      setItems(folders.map((f) => ({
        ...f,
        checked: true,
        customId: f.name.toLowerCase().replace(/[^a-z0-9_-]/g, "-"),
        customName: f.name,
      })));
    } catch (e) {
      showToast(`❌ ${e}`);
    } finally {
      setScanning(false);
    }
  };

  const toggleAll = (val: boolean) =>
    setItems((prev) => prev.map((i) => ({ ...i, checked: val })));

  const update = (idx: number, patch: Partial<FolderItem>) =>
    setItems((prev) => prev.map((item, i) => i === idx ? { ...item, ...patch } : item));

  const handleSave = async () => {
    const selected = items.filter((i) => i.checked);
    if (selected.length === 0) { showToast("❌ 请至少勾选一个文件夹"); return; }

    // 检查 id 是否有重复
    const ids = selected.map((i) => i.customId.trim());
    const dupId = ids.find((id, idx) => ids.indexOf(id) !== idx);
    if (dupId) { showToast(`❌ ID 重复：${dupId}`); return; }
    if (ids.some((id) => !id)) { showToast("❌ 存在空 ID，请检查"); return; }

    setSaving(true);
    try {
      const payload = selected.map((item) => {
        const winPath = item.path;
        const wslPath = pathMode === "wsl_convert" ? winToWsl(item.path) : undefined;
        return {
          id: item.customId.trim(),
          name: item.customName.trim() || item.name,
          win_path: pathMode === "win" ? winPath : undefined,
          wsl_path: pathMode === "wsl_convert" ? wslPath : undefined,
          status: commonStatus,
          priority: commonPriority,
          space_id: currentSpace?.id,
          platform: pathMode === "wsl_convert" ? "wsl" : "windows",
        };
      });

      const skipped = await batchCreateProjects(payload);
      qc.invalidateQueries({ queryKey: ["projects"] });

      if (skipped.length > 0) {
        showToast(`已添加 ${selected.length - skipped.length} 个，跳过 ${skipped.length} 个（ID 已存在或目录已登记）`);
      } else {
        showToast(`成功添加 ${selected.length} 个项目 ✓`);
      }
      onClose();
    } catch (e) {
      showToast(`❌ ${e}`);
    } finally {
      setSaving(false);
    }
  };

  const checkedCount = items.filter((i) => i.checked).length;

  return (
    <Dialog title="批量添加项目" onClose={onClose} size="lg">
      <div className="px-6 py-4 space-y-4">

        {/* Step 1: 选目录 */}
        <div>
          <p className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-2">① 选择父目录</p>
          <div className="flex gap-2">
            <input
              className="flex-1 border border-gray-200 rounded-lg px-3 py-2 text-sm font-mono outline-none focus:ring-2 focus:ring-blue-200"
              value={parentPath}
              onChange={(e) => { setParentPath(e.target.value); setItems([]); }}
              placeholder="C:\projects  或手动输入"
            />
            <button
              onClick={pickFolder}
              className="px-3 py-2 rounded-lg border border-gray-200 text-sm text-gray-600 hover:bg-gray-50 shrink-0"
            >
              📁 浏览
            </button>
            <button
              onClick={scan}
              disabled={scanning || !parentPath.trim()}
              className="px-3 py-2 rounded-lg bg-blue-600 text-white text-sm hover:bg-blue-700 disabled:opacity-50 shrink-0"
            >
              {scanning ? "扫描中…" : "扫描"}
            </button>
          </div>
        </div>

        {/* Step 2: 路径模式 */}
        {items.length > 0 && (
          <div>
            <p className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-2">② 路径存储方式</p>
            <div className="flex gap-2 flex-wrap">
              {([
                ["win",         "仅 Windows 路径"],
                ["wsl_convert", "仅 WSL 路径（自动转换）"],
              ] as [PathMode, string][]).map(([val, label]) => (
                <button
                  key={val}
                  onClick={() => setPathMode(val)}
                  className={`px-3 py-1.5 rounded-lg text-xs border transition-colors ${
                    pathMode === val
                      ? "bg-blue-600 text-white border-blue-600"
                      : "border-gray-200 text-gray-600 hover:bg-gray-50"
                  }`}
                >
                  {label}
                </button>
              ))}
            </div>
            {pathMode === "wsl_convert" && (
              <p className="text-xs text-gray-400 mt-1">
                示例：<code className="bg-gray-100 px-1 rounded">C:\projects\app</code> → <code className="bg-gray-100 px-1 rounded">/mnt/c/projects/app</code>
              </p>
            )}
          </div>
        )}

        {/* Step 3: 公共字段 */}
        {items.length > 0 && (
          <div>
            <p className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-2">③ 公共属性</p>
            <div className="flex gap-3">
              <div className="flex-1">
                <label className="block text-xs text-gray-500 mb-1">状态</label>
                <select
                  className="w-full border border-gray-200 rounded-lg px-3 py-2 text-sm"
                  value={commonStatus}
                  onChange={(e) => setCommonStatus(e.target.value)}
                >
                  {[["active","进行中"],["maintenance","维护中"],["paused","暂停"],["archived","已归档"]].map(([v,l]) => (
                    <option key={v} value={v}>{l}</option>
                  ))}
                </select>
              </div>
              <div className="flex-1">
                <label className="block text-xs text-gray-500 mb-1">优先级</label>
                <select
                  className="w-full border border-gray-200 rounded-lg px-3 py-2 text-sm"
                  value={commonPriority}
                  onChange={(e) => setCommonPriority(e.target.value)}
                >
                  {[["high","高"],["mid","中"],["low","低"]].map(([v,l]) => (
                    <option key={v} value={v}>{l}</option>
                  ))}
                </select>
              </div>
            </div>
          </div>
        )}

        {/* Step 4: 文件夹列表 */}
        {items.length > 0 && (
          <div>
            <div className="flex items-center justify-between mb-2">
              <p className="text-xs font-semibold text-gray-500 uppercase tracking-wide">
                ④ 选择文件夹
                <span className="ml-2 font-normal text-gray-400 normal-case">
                  已选 {checkedCount} / {items.length}
                </span>
              </p>
              <div className="flex gap-2">
                <button onClick={() => toggleAll(true)}  className="text-xs text-blue-600 hover:underline">全选</button>
                <button onClick={() => toggleAll(false)} className="text-xs text-gray-400 hover:underline">全不选</button>
              </div>
            </div>

            <div className="border border-gray-100 rounded-lg overflow-hidden max-h-64 overflow-y-auto">
              <table className="w-full text-xs">
                <thead className="bg-gray-50 text-gray-500 sticky top-0">
                  <tr>
                    <th className="w-8 px-3 py-2 text-center"></th>
                    <th className="px-3 py-2 text-left font-medium">项目 ID</th>
                    <th className="px-3 py-2 text-left font-medium">显示名称</th>
                    <th className="px-3 py-2 text-left font-medium text-gray-400">文件夹名</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-gray-50">
                  {items.map((item, idx) => (
                    <tr key={item.path} className={item.checked ? "bg-white" : "bg-gray-50 opacity-50"}>
                      <td className="px-3 py-2 text-center">
                        <input
                          type="checkbox"
                          checked={item.checked}
                          onChange={(e) => update(idx, { checked: e.target.checked })}
                          className="accent-blue-600 cursor-pointer"
                        />
                      </td>
                      <td className="px-2 py-1.5">
                        <input
                          className="w-full border border-gray-200 rounded px-2 py-1 font-mono text-xs outline-none focus:ring-1 focus:ring-blue-200 disabled:bg-gray-50 disabled:text-gray-400"
                          value={item.customId}
                          disabled={!item.checked}
                          onChange={(e) => update(idx, { customId: e.target.value })}
                        />
                      </td>
                      <td className="px-2 py-1.5">
                        <input
                          className="w-full border border-gray-200 rounded px-2 py-1 text-xs outline-none focus:ring-1 focus:ring-blue-200 disabled:bg-gray-50 disabled:text-gray-400"
                          value={item.customName}
                          disabled={!item.checked}
                          onChange={(e) => update(idx, { customName: e.target.value })}
                        />
                      </td>
                      <td className="px-3 py-1.5 text-gray-400 font-mono">{item.name}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </div>
        )}

        {items.length === 0 && !scanning && parentPath && (
          <div className="text-center py-6 text-gray-400 text-sm">
            点击「扫描」加载文件夹列表
          </div>
        )}
      </div>

      <div className="flex justify-end gap-3 px-6 py-4 border-t border-gray-100">
        <button onClick={onClose} className="px-4 py-2 rounded-lg text-sm border border-gray-200 text-gray-600 hover:bg-gray-50">
          取消
        </button>
        <button
          onClick={handleSave}
          disabled={saving || checkedCount === 0}
          className="px-4 py-2 rounded-lg text-sm bg-blue-600 text-white hover:bg-blue-700 disabled:opacity-50"
        >
          {saving ? "添加中…" : `添加 ${checkedCount} 个项目`}
        </button>
      </div>
    </Dialog>
  );
}