#!/usr/bin/env node

const fs = require("fs");
const path = require("path");

/**
 * Simple dotenv implementation to load .env file
 */
function loadEnv() {
  const envPath = path.join(__dirname, ".env");

  if (fs.existsSync(envPath)) {
    const envContent = fs.readFileSync(envPath, "utf8");
    const lines = envContent.split("\n");

    lines.forEach((line) => {
      const trimmedLine = line.trim();
      if (trimmedLine && !trimmedLine.startsWith("#")) {
        const [key, ...valueParts] = trimmedLine.split("=");
        if (key && valueParts.length > 0) {
          const value = valueParts.join("=").replace(/^["']|["']$/g, ""); // Remove quotes
          process.env[key.trim()] = value.trim();
        }
      }
    });

    console.log("✅ Loaded environment variables from .env file");
  }
}

// Load .env file at startup
loadEnv();

/**
 * Fetches releases from GitHub API
 * @param {string} owner - Repository owner
 * @param {string} repo - Repository name
 * @param {string} token - GitHub personal access token (optional)
 * @returns {Promise<Array>} Array of release objects
 */
async function fetchGitHubReleases(owner, repo, token = null) {
  const headers = {
    "User-Agent": "FormlyAI-Release-Updater",
    Accept: "application/vnd.github.v3+json",
  };

  // Add authentication if token is provided
  if (token) {
    headers["Authorization"] = `token ${token}`;
  }

  let allReleases = [];
  let page = 1;
  const perPage = 100; // Maximum allowed by GitHub API
  const cutoffDate = new Date("2024-01-01"); // Only fetch releases from Jan 2024 onwards

  try {
    while (true) {
      const url = `https://api.github.com/repos/${owner}/${repo}/releases?page=${page}&per_page=${perPage}`;

      const response = await fetch(url, { headers });
      if (!response.ok) {
        if (response.status === 404) {
          throw new Error(
            `Repository not found or not accessible. Make sure the repository exists and you have access to it.`
          );
        }
        throw new Error(
          `GitHub API request failed: ${response.status} ${response.statusText}`
        );
      }

      const releases = await response.json();

      // If no releases returned, we've reached the end
      if (releases.length === 0) {
        break;
      }

      // Filter releases to only include those from Jan 2024 onwards
      const filteredReleases = releases.filter((release) => {
        const releaseDate = new Date(release.published_at);
        return releaseDate >= cutoffDate;
      });

      allReleases = allReleases.concat(filteredReleases);

      // If we found releases older than our cutoff, we can stop fetching
      const hasOlderReleases = releases.some((release) => {
        const releaseDate = new Date(release.published_at);
        return releaseDate < cutoffDate;
      });

      if (hasOlderReleases) {
        console.log(`Stopped fetching at releases older than January 2024`);
        break;
      }

      // If we got fewer releases than requested, we've reached the end
      if (releases.length < perPage) {
        break;
      }

      page++;
    }

    return allReleases;
  } catch (error) {
    console.error("Error fetching GitHub releases:", error.message);
    throw error;
  }
}

/**
 * Parses existing release notes to extract existing versions
 * @param {string} content - Content of the release notes file
 * @returns {Set<string>} Set of existing version tags
 */
function parseExistingReleases(content) {
  const existingVersions = new Set();
  const updateRegex = /<Update[^>]*description="([^"]*)"[^>]*>/g;

  let match;
  while ((match = updateRegex.exec(content)) !== null) {
    existingVersions.add(match[1]);
  }

  return existingVersions;
}

/**
 * Formats a date to YYYY-MM-DD format
 * @param {string} dateString - ISO date string
 * @returns {string} Formatted date
 */
function formatDate(dateString) {
  const date = new Date(dateString);
  return date.toISOString().split("T")[0];
}

/**
 * Converts markdown to plain text (basic conversion)
 * @param {string} markdown - Markdown text
 * @returns {string} Plain text
 */
function markdownToText(markdown) {
  if (!markdown) return "";

  return (
    markdown
      // Remove headers
      .replace(/^#{1,6}\s+/gm, "")
      // Remove bold/italic
      .replace(/\*\*([^*]+)\*\*/g, "$1")
      .replace(/\*([^*]+)\*/g, "$1")
      // Remove links but keep text
      .replace(/\[([^\]]+)\]$[^)]+$/g, "$1")
      // Remove code blocks
      .replace(/```[\s\S]*?```/g, "")
      .replace(/`([^`]+)`/g, "$1")
      // Remove bullet points
      .replace(/^\s*[-*+]\s+/gm, "• ")
      // Clean up extra whitespace
      .replace(/\n\s*\n/g, "\n")
      .trim()
  );
}

/**
 * Generates update entry for a release
 * @param {Object} release - GitHub release object
 * @returns {string} Update entry markdown
 */
function generateUpdateEntry(release) {
  const date = formatDate(release.published_at);
  const version = release.tag_name;
  const description =
    markdownToText(release.body) || "Release notes not available.";

  return `<Update label="${date}" description="${version}">
  ${description}
</Update>`;
}

/**
 * Main function to update release notes
 */
async function updateReleaseNotes() {
  const owner = "formlyai";
  const repo = "frontend";
  const releaseNotesPath = path.join(
    __dirname,
    "changelog",
    "release-notes.mdx"
  );

  // Get GitHub token from environment variable
  const githubToken = process.env.GITHUB_TOKEN;

  if (!githubToken) {
    console.log("⚠️  No GITHUB_TOKEN found.");
    console.log(
      "For private repositories, you need to set a GitHub personal access token."
    );
    console.log("\nOption 1: Create a .env file in this directory with:");
    console.log("GITHUB_TOKEN=your_token_here");
    console.log("\nOption 2: Set environment variable:");
    console.log("export GITHUB_TOKEN=your_token_here");
    console.log(
      "\nTo create a token, go to: https://github.com/settings/tokens"
    );
    console.log(
      "Required permissions: 'repo' (for private repos) or 'public_repo' (for public repos)"
    );
    process.exit(1);
  }

  try {
    console.log("Fetching releases from GitHub...");
    const releases = await fetchGitHubReleases(owner, repo, githubToken);

    console.log(`Found ${releases.length} releases`);

    // Read existing release notes
    let existingContent = "";
    if (fs.existsSync(releaseNotesPath)) {
      existingContent = fs.readFileSync(releaseNotesPath, "utf8");
    }

    // Parse existing versions
    const existingVersions = parseExistingReleases(existingContent);
    console.log(`Found ${existingVersions.size} existing releases in document`);

    // Filter new releases
    const newReleases = releases.filter(
      (release) =>
        !existingVersions.has(release.tag_name) &&
        !release.draft &&
        !release.prerelease
    );

    console.log(`Found ${newReleases.length} new releases to add`);

    if (newReleases.length === 0) {
      console.log("No new releases to add. Release notes are up to date!");
      return;
    }

    // Sort releases by date (newest first)
    newReleases.sort(
      (a, b) => new Date(b.published_at) - new Date(a.published_at)
    );

    // Generate update entries
    const updateEntries = newReleases.map((release) =>
      generateUpdateEntry(release)
    );

    // Prepare new content
    let newContent;
    if (
      existingContent.trim() === "" ||
      existingContent.includes("---\ntitle: Release Notes\n---")
    ) {
      // If file is empty or only has frontmatter, start fresh
      newContent = `---
title: Release Notes
---

${updateEntries.join("\n\n")}
`;
    } else {
      // Append to existing content
      newContent = existingContent + "\n\n" + updateEntries.join("\n\n");
    }

    // Write updated content
    fs.writeFileSync(releaseNotesPath, newContent, "utf8");

    console.log(
      `✅ Successfully added ${newReleases.length} new release(s) to ${releaseNotesPath}`
    );

    // Log the new releases added
    newReleases.forEach((release) => {
      console.log(
        `  • ${release.tag_name} (${formatDate(release.published_at)})`
      );
    });
  } catch (error) {
    console.error("❌ Error updating release notes:", error.message);
    process.exit(1);
  }
}

// Run the script
if (require.main === module) {
  updateReleaseNotes();
}

module.exports = { updateReleaseNotes, fetchGitHubReleases };


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