import { NextResponse } from "next/server" import fs from "fs" import path from "path" interface ChangelogEntry { version: string date: string content: string url: string title: string } function formatContentForRSS(content: string): string { return ( content .replace(/https:\/\/macrimi\.github\.io\/ProxMenux/g, "https://proxmenux.com") .replace(/`([^`]+)`/g, "$1") .replace(/!\[([^\]]*)\]$$([^)]+)$$/g, (match, alt, url) => { // Convert relative URLs to absolute let absoluteUrl = url if (url.startsWith("/")) { absoluteUrl = `https://proxmenux.com${url}` } else if (!url.startsWith("http://") && !url.startsWith("https://")) { // Relative path, make it absolute absoluteUrl = `https://proxmenux.com/${url}` } return `${alt}` }) // Convert markdown links to HTML .replace(/\[([^\]]+)\]$$([^)]+)$$/g, '$1') // Convert ### headers to

tags .replace(/^### (.+)$/gm, "

$1

") // Convert ** bold ** to tags .replace(/\*\*(.*?)\*\*/g, "$1") // Convert code blocks to 
 tags
      .replace(/```[\s\S]*?```/g, (match) => {
        const code = match.replace(/```/g, "").trim()
        return `
${code}
`
      })
      // Convert - bullet points to 
  •  tags
      .replace(/^- (.+)$/gm, "
  • $1
    • ")
      // Wrap consecutive 
  •  tags in 
      
      .replace(/(
    • .*?<\/li>\s*)+/g, (match) => `
        ${match}
      `)
      .replace(/\n/g, "
      ")
      // Clean up extra spaces
      .replace(/\s+/g, " ")
      .trim()
  )
}

async function parseChangelog(): Promise {
  try {
    const changelogPath = path.join(process.cwd(), "..", "CHANGELOG.md")

    if (!fs.existsSync(changelogPath)) {
      return []
    }

    const fileContents = fs.readFileSync(changelogPath, "utf8")
    const entries: ChangelogEntry[] = []

    // Split by ## headers (both versions and dates)
    const lines = fileContents.split("\n")
    let currentEntry: Partial | null = null
    let contentLines: string[] = []

    for (const line of lines) {
      // Check for version header: ## [1.1.1] - 2025-03-21
      const versionMatch = line.match(/^##\s+\[([^\]]+)\]\s*-\s*(\d{4}-\d{2}-\d{2})/)

      // Check for date-only header: ## 2025-05-13
      const dateMatch = line.match(/^##\s+(\d{4}-\d{2}-\d{2})$/)

      if (versionMatch || dateMatch) {
        // Save previous entry if exists
        if (currentEntry && contentLines.length > 0) {
          const rawContent = contentLines.join("\n").trim()
          currentEntry.content = formatContentForRSS(rawContent)
          if (currentEntry.version && currentEntry.date && currentEntry.title) {
            entries.push(currentEntry as ChangelogEntry)
          }
        }

        // Start new entry
        if (versionMatch) {
          const version = versionMatch[1]
          const date = versionMatch[2]
          currentEntry = {
            version,
            date,
            url: `https://proxmenux.com/changelog#${version}`,
            title: `ProxMenux ${version}`,
          }
        } else if (dateMatch) {
          const date = dateMatch[1]
          currentEntry = {
            version: date,
            date,
            url: `https://proxmenux.com/changelog#${date}`,
            title: `ProxMenux Update ${date}`,
          }
        }

        contentLines = []
      } else if (currentEntry && line.trim()) {
        // Add content lines (skip empty lines at the beginning)
        if (contentLines.length > 0 || line.trim() !== "") {
          contentLines.push(line)
        }
      }
    }

    // Don't forget the last entry
    if (currentEntry && contentLines.length > 0) {
      const rawContent = contentLines.join("\n").trim()
      currentEntry.content = formatContentForRSS(rawContent)
      if (currentEntry.version && currentEntry.date && currentEntry.title) {
        entries.push(currentEntry as ChangelogEntry)
      }
    }

    return entries.slice(0, 20) // Latest 20 entries
  } catch (error) {
    console.error("Error parsing changelog:", error)
    return []
  }
}

export async function GET() {
  const entries = await parseChangelog()
  const siteUrl = "https://proxmenux.com"

  const rssXml = `

  
    ProxMenux Changelog
    Latest updates and changes in ProxMenux - An Interactive Menu for Proxmox VE Management
    ${siteUrl}/changelog
    
    en-US
    ${new Date().toUTCString()}
    ProxMenux RSS Generator
    60
    
    ${entries
      .map(
        (entry) => `
    
      ${entry.title}
      
      ${entry.url}
      ${entry.url}
      ${new Date(entry.date).toUTCString()}
      Changelog
    `,
      )
      .join("")}
  
`

  return new NextResponse(rssXml, {
    headers: {
      "Content-Type": "application/rss+xml; charset=utf-8",
      "Cache-Control": "public, max-age=3600, s-maxage=3600",
    },
  })
}