import { memo, useEffect, useState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Dialog,
  DialogContent,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { toast } from "sonner";
import { ClipboardPaste } from "lucide-react";

type Props = {
  open: boolean;
  onOpenChange: (v: boolean) => void;
  position: "above" | "below";
  onConfirm: (name: string, values?: Record<string, string>) => void | Promise<void>;
  validate?: (name: string) => string | null;
  availableLanguages: string[];
};

function AddEntryModalImpl({ open, onOpenChange, position, onConfirm, validate, availableLanguages }: Props) {
  const [name, setName] = useState("");
  const [err, setErr] = useState<string | null>(null);
  const [saving, setSaving] = useState(false);
  const [clipboardValues, setClipboardValues] = useState<Record<string, string> | null>(null);
  const [useClipboard, setUseClipboard] = useState(false);

  useEffect(() => {
    if (open) {
      setName("");
      setErr(null);
      setSaving(false);
      setUseClipboard(false);
      
      // 尝试读取剪贴板内容
      checkClipboard();
    }
  }, [open]);

  async function checkClipboard() {
    try {
      const text = await navigator.clipboard.readText();
      const parsed = JSON.parse(text);
      
      // 验证是否是有效的语言值对象
      if (typeof parsed === 'object' && parsed !== null && !Array.isArray(parsed)) {
        const keys = Object.keys(parsed);
        const allStrings = keys.every(key => typeof parsed[key] === 'string');
        
        if (allStrings && keys.length > 0) {
          setClipboardValues(parsed);
          setUseClipboard(true);
          return;
        }
      }
    } catch {
      // 剪贴板内容不是有效的 JSON 或无法访问，忽略
    }
    
    setClipboardValues(null);
    setUseClipboard(false);
  }

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    const trimmed = name.trim();
    if (!trimmed) return setErr("名称不能为空");
    if (trimmed.includes(".")) return setErr("名称不能包含 '.'");
    if (validate) {
      const msg = validate(trimmed);
      if (msg) return setErr(msg);
    }
    
    setSaving(true);
    try {
      const values = useClipboard && clipboardValues ? clipboardValues : undefined;
      await onConfirm(trimmed, values);
      onOpenChange(false);
    } catch (e) {
      setErr((e as Error)?.message ?? "操作失败");
    } finally {
      setSaving(false);
    }
  }

  const title = position === "above" ? "在上方新增条目" : "在下方新增条目";

  return (
    <Dialog open={open} onOpenChange={(v) => { if (!saving) onOpenChange(v); }}>
      <DialogContent className="max-w-2xl">
        <DialogHeader>
          <DialogTitle>{title}</DialogTitle>
        </DialogHeader>
        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <Input
              placeholder="请输入条目名称（不含点）"
              value={name}
              onChange={(e) => setName(e.target.value)}
              aria-label="名称"
            />
          </div>
          
          {clipboardValues && (
            <div className="space-y-3 p-4 border rounded-md bg-muted/30">
              <div className="flex items-center gap-2">
                <Checkbox
                  id="use-clipboard"
                  checked={useClipboard}
                  onCheckedChange={(checked) => setUseClipboard(!!checked)}
                />
                <label
                  htmlFor="use-clipboard"
                  className="text-sm font-medium cursor-pointer flex items-center gap-2"
                >
                  <ClipboardPaste className="w-4 h-4" />
                  使用剪贴板中的翻译值
                </label>
              </div>
              
              {useClipboard && (
                <div className="space-y-2 pl-6">
                  <div className="text-xs text-muted-foreground">检测到以下语言的翻译：</div>
                  <div className="grid grid-cols-2 gap-2 max-h-48 overflow-y-auto">
                    {Object.entries(clipboardValues).map(([lang, value]) => {
                      const isAvailable = availableLanguages.includes(lang);
                      return (
                        <div
                          key={lang}
                          className={`text-xs p-2 rounded border ${
                            isAvailable
                              ? "bg-background border-border"
                              : "bg-muted/50 border-muted text-muted-foreground"
                          }`}
                        >
                          <div className="font-mono font-semibold mb-1">
                            {lang}
                            {!isAvailable && (
                              <span className="ml-1 text-[10px] text-orange-600">(项目中不存在)</span>
                            )}
                          </div>
                          <div className="break-all line-clamp-2">{value}</div>
                        </div>
                      );
                    })}
                  </div>
                  {Object.keys(clipboardValues).some(lang => !availableLanguages.includes(lang)) && (
                    <div className="text-xs text-orange-600">
                      注意：部分语言在当前项目中不存在，这些值将被忽略
                    </div>
                  )}
                </div>
              )}
            </div>
          )}
          
          {err && <div className="text-sm text-red-600">{err}</div>}
          
          <DialogFooter>
            <Button type="button" variant="outline" onClick={() => onOpenChange(false)} disabled={saving}>
              取消
            </Button>
            <Button type="submit" disabled={saving}>
              确认新增
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}

export const AddEntryModal = memo(AddEntryModalImpl);