import { FORGE_PROJECTS } from "@/data/forge";
import { ChangelogEntry, ForgeProject } from "@/types";
import "server-only";

export async function getAllForgeProjects(): Promise<ForgeProject[]> {
  // We use Promise.all to fetch all changelogs in parallel for speed
  return Promise.all(
    FORGE_PROJECTS.map(async (metadata) => {
      const changelog = await getPrivateChangelog(metadata.repoName);
      const latestVersion =
        changelog.length > 0 ? changelog[0].version : "0.0.0";

      return {
        ...metadata,
        currentVersion: `${latestVersion}_${metadata.status}`,
        changelog: changelog,
      };
    }),
  );
}

export async function getPrivateChangelog(
  repoName: string,
): Promise<ChangelogEntry[]> {
  const repoOwner = "georgew";
  const filePath = "changelog.md";
  const url = `https://git.georgew.dev/api/v1/repos/${repoOwner}/${repoName}/contents/${filePath}`;
  const headers = {
    headers: {
      Authorization: `token ${process.env.FORGEJO_TOKEN}`,
      Accept: "application/vnd.forgejo.raw",
    },
    next: { revalidate: 3600 },
  };

  try {
    const response = await fetch(url, headers);

    if (!response.ok) {
      return [
        {
          version: "v0.0.0",
          date: new Date().toISOString().split("T")[0],
          changes: ["Documentation currently synchronizing with the Forge..."],
        },
      ];
    }

    const data = await response.json();

    // 2. Forgejo returns the content as a base64 string
    // We need to decode it to UTF-8
    const markdownText = Buffer.from(data.content, "base64").toString("utf-8");

    return parseMarkdown(markdownText);
  } catch (error) {
    console.error("Git Fetch Error:", error);
    return [];
  }
}

// Simple parser for your ## [Version] - YYYY-MM-DD format
function parseMarkdown(text: string): ChangelogEntry[] {
  // Split by "## " at the start of a line to isolate version blocks
  const sections = text.split(/\n(?=## )/g);

  return sections
    .map((section) => {
      const lines = section
        .split("\n")
        .map((l) => l.trim())
        .filter(Boolean);
      if (lines.length === 0) return null;

      // Match the pattern: ## [Version] - YYYY-MM-DD
      const headerMatch = lines[0].match(/## \[(.*?)\] - (.*)/);
      if (!headerMatch) return null;

      const version = headerMatch[1];
      const date = headerMatch[2];

      // Collect all lines starting with "- " anywhere in this version block
      const changes = lines
        .filter((line) => line.startsWith("- "))
        .map((line) => line.replace("- ", ""));

      return { version, date, changes };
    })
    .filter((entry): entry is ChangelogEntry => entry !== null)
    .slice(0, 3);
}