/**
 * 集合 → Markdown 接口文档。
 */
import type { Collection, CollectionNode, HttpRequestData } from "../model";
import { buildUrlWithQuery } from "./curl";

export function exportMarkdown(collection: Collection): string {
  const lines: string[] = [];
  lines.push(`# ${collection.name}`, "");
  if (collection.description) lines.push(collection.description, "");
  lines.push("> 由 OpsxAPI 导出 · " + new Date().toLocaleString("zh-CN"), "");

  const toc: string[] = [];
  const visitToc = (nodes: CollectionNode[], prefix: string) => {
    for (const node of nodes) {
      if (node.type === "folder") {
        toc.push(`${prefix}- 📁 ${node.name}`);
        visitToc(node.children, `${prefix}  `);
      } else {
        toc.push(`${prefix}- [${node.name}](#${anchor(node.name)})`);
      }
    }
  };
  visitToc(collection.children, "");
  if (toc.length) lines.push("## 目录", "", ...toc, "");

  const visit = (nodes: CollectionNode[], depth: number) => {
    for (const node of nodes) {
      const hashes = "#".repeat(Math.min(depth + 1, 6));
      if (node.type === "folder") {
        lines.push(`${hashes} ${node.name}`, "");
        if (node.description) lines.push(node.description, "");
        visit(node.children, depth + 1);
        continue;
      }
      lines.push(`${hashes} ${node.name}`, "");
      if (node.description) lines.push(node.description, "");

      if (node.kind === "http") {
        const d: HttpRequestData = node.data;
        lines.push(
          "",
          `- **Method**：\`${d.method}\``,
          `- **URL**：\`${buildUrlWithQuery(d)}\``,
        );
        if (d.auth.mode !== "none") {
          lines.push(`- **鉴权**：\`${d.auth.mode}\``);
        }
        if (d.query.filter((q) => q.enabled && q.key).length) {
          lines.push("", "**Query 参数**", "", "| 参数 | 示例值 | 说明 |", "| --- | --- | --- |");
          for (const q of d.query) {
            if (!q.enabled || !q.key) continue;
            lines.push(`| \`${q.key}\` | \`${escapeTable(q.value)}\` | ${escapeTable(q.description ?? "")} |`);
          }
        }
        if (d.headers.filter((h) => h.enabled && h.key).length) {
          lines.push("", "**Headers**", "", "| Header | 示例值 | 说明 |", "| --- | --- | --- |");
          for (const h of d.headers) {
            if (!h.enabled || !h.key) continue;
            lines.push(`| \`${h.key}\` | \`${escapeTable(h.value)}\` | ${escapeTable(h.description ?? "")} |`);
          }
        }
        if (d.bodyMode !== "none") {
          const lang = d.bodyMode === "json" ? "json" : d.bodyMode === "xml" ? "xml" : "";
          if (d.bodyMode === "urlencoded" || d.bodyMode === "form-data") {
            lines.push("", `**请求体（${d.bodyMode}）**`, "", "| 字段 | 示例值 |", "| --- | --- |");
            for (const f of d.bodyForm) {
              if (!f.enabled || !f.key) continue;
              lines.push(`| \`${f.key}\` | \`${escapeTable(f.value)}\` |`);
            }
          } else if (d.bodyRaw) {
            lines.push("", `**请求体（${d.bodyMode}）**`, "", "```" + lang, d.bodyRaw, "```");
          }
        }
        lines.push("");
      } else {
        const d = node.data as { url?: string; brokerUrl?: string };
        const url = "url" in d ? d.url : d.brokerUrl ?? "";
        lines.push("", `- **协议**：\`${node.kind}\``, `- **地址**：\`${url}\``);
        lines.push("");
      }
    }
  };
  visit(collection.children, 1);

  return lines.join("\n");
}

function escapeTable(s: string): string {
  return s.replaceAll("|", "\\|").replaceAll("\n", " ");
}

function anchor(name: string): string {
  return name.toLowerCase().replace(/[^\p{L}\p{N}\s-]/gu, "").trim().replace(/\s+/g, "-");
}