import { useCallback, useEffect, useState } from "react";
import { getDdl } from "./api";
import { ensureSession } from "./ObjectTree";
import { useWorkspaceStore, type SavedConnection } from "./store";
import { OpsModal } from "./OpsModal";

/** 超长 DDL 截断阈值(R2-F3):超过只展示前 5000 字符并提示 */
const DDL_CAP = 5000;

type Props = {
  conn: SavedConnection;
  database: string;
  table: string;
  onClose: () => void;
};

/**
 * R2-F3:DDL 查看 —— OpsModal(info 变体)展示服务端返回的建表语句。
 * 等宽 pre + 加载态 + 错误重试;「复制」「插入编辑器」把 DDL 带到剪贴板/当前 Tab。
 */
export function DdlModal({ conn, database, table, onClose }: Props) {
  const notify = useWorkspaceStore((s) => s.notify);
  const [ddl, setDdl] = useState<string | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);

  const load = useCallback(async () => {
    setLoading(true);
    setError(null);
    try {
      const sid = await ensureSession(conn);
      const res = await getDdl(conn, table, { database, sessionId: sid });
      if (res.error) throw new Error(res.error);
      setDdl(res.ddl ?? "(空)");
    } catch (e) {
      setError(e instanceof Error ? e.message : String(e));
      setDdl(null);
    } finally {
      setLoading(false);
    }
  }, [conn, database, table]);

  useEffect(() => {
    void load();
  }, [load]);

  const truncated = ddl != null && ddl.length > DDL_CAP;
  const text = truncated ? (ddl ?? "").slice(0, DDL_CAP) : (ddl ?? "");

  const copy = async () => {
    await navigator.clipboard.writeText(text);
    notify({ kind: "success", title: "已复制", message: `${database}.${table} DDL`, mode: "toast", durationMs: 1400 });
  };

  /** 插入编辑器:DDL 追加到当前激活 Tab 的 SQL 末尾 */
  const insertToEditor = () => {
    const st = useWorkspaceStore.getState();
    const tab = st.tabs.find((t) => t.id === st.activeTabId);
    const cur = tab?.sql ?? "";
    st.updateActiveSql(cur.trim() ? `${cur.replace(/\s+$/, "")}\n\n${text}` : text);
    notify({ kind: "success", title: "已插入编辑器", message: `${database}.${table} DDL`, mode: "toast", durationMs: 1600 });
    onClose();
  };

  return (
    <OpsModal variant="info" wide title={`DDL · ${database ? `${database}.` : ""}${table}`} okLabel="关闭" onOk={onClose}>
      {loading ? (
        <div style={{ color: "var(--ops-muted)" }}>加载 DDL…</div>
      ) : error ? (
        <div>
          <div
            className="rounded border px-2.5 py-1.5"
            style={{
              borderColor: "color-mix(in srgb, var(--ops-danger) 40%, var(--ops-border))",
              background: "color-mix(in srgb, var(--ops-danger) 10%, transparent)",
              color: "var(--ops-danger)",
              fontSize: "var(--ops-text-sm)",
            }}
          >
            {error}
          </div>
          <div className="mt-2 flex justify-end">
            <button type="button" className="ops-btn-secondary h-6 px-2 text-[11px]" onClick={() => void load()}>
              重试
            </button>
          </div>
        </div>
      ) : (
        <>
          <div className="mb-1.5 flex items-center justify-end gap-1.5">
            <button type="button" className="ops-btn-secondary h-6 px-2 text-[11px]" onClick={() => void copy()}>
              复制
            </button>
            <button type="button" className="ops-btn-secondary h-6 px-2 text-[11px]" onClick={insertToEditor}>
              插入编辑器
            </button>
          </div>
          <pre
            className="m-0 max-h-[50vh] overflow-auto whitespace-pre-wrap break-all rounded border px-2.5 py-2 font-mono leading-relaxed"
            style={{
              fontSize: "var(--ops-text-xs)",
              borderColor: "var(--ops-border-soft)",
              background: "var(--ops-editor-bg)",
              color: "var(--ops-text)",
            }}
          >
            {text}
          </pre>
          {truncated && (
            <div className="mt-1.5" style={{ fontSize: "var(--ops-text-xs)", color: "var(--ops-warning)" }}>
              内容过长,仅显示前 {DDL_CAP} 字符(共 {ddl?.length} 字符)。
            </div>
          )}
        </>
      )}
    </OpsModal>
  );
}