import type { Edge, Node } from "@xyflow/react";
import { NODE_KINDS } from "../studio/nodeCatalog";

// Task DSL —— React Flow 画布的可序列化表示，提交给 Gateway 解析组装。
export interface TaskDsl {
  version: "1";
  nodes: Array<{ id: string; kind: string; label?: string; config: unknown }>;
  edges: Array<{ source: string; target: string }>;
}

// exportDsl 把画布的节点/连线导出为类型化 JSON DSL。
export function exportDsl(nodes: Node[], edges: Edge[]): TaskDsl {
  return {
    version: "1",
    nodes: nodes.map((n) => {
      const d = n.data as { kind: string; label?: string; config?: unknown };
      return { id: n.id, kind: d.kind, label: d.label, config: d.config ?? {} };
    }),
    edges: edges.map((e) => ({ source: e.source, target: e.target })),
  };
}

export interface Issue {
  level: "error" | "warn";
  msg: string;
}

// validate 轻量校验（前端先行；真实 schema 校验应由后端兜底）。
export function validate(nodes: Node[], edges: Edge[]): Issue[] {
  const issues: Issue[] = [];
  if (nodes.length === 0) {
    issues.push({ level: "error", msg: "画布为空：至少添加一个节点" });
    return issues;
  }
  const connected = new Set<string>();
  edges.forEach((e) => {
    connected.add(e.source);
    connected.add(e.target);
  });
  for (const n of nodes) {
    const d = n.data as { kind: string; label?: string; config?: Record<string, unknown> };
    const k = NODE_KINDS[d.kind];
    if (nodes.length > 1 && !connected.has(n.id)) {
      issues.push({ level: "warn", msg: `节点「${d.label || k?.label}」未连线（孤立）` });
    }
    k?.fields
      .filter((f) => f.required)
      .forEach((f) => {
        const v = d.config?.[f.key];
        if (v === undefined || v === "" || String(v).startsWith("（未")) {
          issues.push({ level: "warn", msg: `节点「${d.label || k.label}」缺必填项：${f.label}` });
        }
      });
  }
  return issues;
}