/**
 * Markdown API 文档导入器：提取 curl 代码块（及可选 JSON 请求体示例）。
 */
import type { Collection } from "../model";
import { createCollection, createFolder } from "../factory";
import type { ImportResult } from "../model";
import { importCurl } from "./curl";

export function looksLikeMarkdown(text: string): boolean {
  const t = text.trimStart();
  if (!t.startsWith("#") && !t.includes("```")) return false;
  return /^#{1,6}\s/m.test(text) || /```/.test(text);
}

export function importMarkdown(text: string): ImportResult {
  const warnings: string[] = [];
  const blocks: { heading: string; code: string }[] = [];

  const lines = text.split(/\r?\n/);
  let heading = "";
  let inBlock = false;
  let lang = "";
  let buf: string[] = [];

  for (const line of lines) {
    const fence = line.match(/^\s*```(\w*)\s*$/);
    if (fence) {
      if (!inBlock) {
        inBlock = true;
        lang = fence[1].toLowerCase();
        buf = [];
      } else {
        inBlock = false;
        const code = buf.join("\n");
        if (["curl", "bash", "sh", "shell", ""].includes(lang) && code.trim().startsWith("curl")) {
          blocks.push({ heading: heading || `curl ${blocks.length + 1}`, code });
        }
      }
      continue;
    }
    if (inBlock) {
      buf.push(line);
      continue;
    }
    const h = line.match(/^#{1,6}\s+(.*)$/);
    if (h) heading = h[1].trim();
  }

  if (blocks.length === 0) {
    warnings.push("未在 Markdown 中找到 curl 代码块（也支持直接粘贴 cURL 导入）");
  }

  const folders = new Map<string, ReturnType<typeof createFolder>>();
  const rootChildren = [];
  for (const block of blocks) {
    try {
      const temp = importCurl(block.code, "temp");
      const node = temp.children[0];
      if (!node) continue;
      // 一级标题做目录，二级及以下做请求名
      const parts = block.heading.split(/[:：]/);
      const folderName = parts[0]?.trim();
      if (folderName && folders.has(folderName)) {
        folders.get(folderName)!.children.push(node);
      } else if (folderName) {
        const f = createFolder(folderName, [node]);
        folders.set(folderName, f);
      } else {
        rootChildren.push(node);
      }
    } catch (e) {
      warnings.push(`解析代码块失败：${e instanceof Error ? e.message : String(e)}`);
    }
  }

  const collection = createCollection(
    firstHeading(text) || "Markdown 导入",
    [...folders.values(), ...rootChildren],
  );
  return { collections: [collection], environmentVariables: [], warnings };
}

function firstHeading(text: string): string {
  const m = text.match(/^#\s+(.+)$/m);
  return m ? m[1].trim().slice(0, 60) : "";
}