#!/usr/bin/env node

import fs from "fs"
import path from "path"
import os from "os"
import { spawnSync } from "child_process"
import { fileURLToPath } from "url"

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

const GITEA_HOST = process.env.TFCODE_GITEA_HOST || "gitea.toothfairyai.com"
const GITEA_REPO = process.env.TFCODE_GITEA_REPO || "ToothFairyAI/tf_code"

function detectPlatform() {
  let platform
  switch (os.platform()) {
    case "darwin":
      platform = "darwin"
      break
    case "linux":
      platform = "linux"
      break
    case "win32":
      platform = "windows"
      break
    default:
      platform = os.platform()
  }

  let arch
  switch (os.arch()) {
    case "x64":
      arch = "x64"
      break
    case "arm64":
      arch = "arm64"
      break
    default:
      arch = os.arch()
  }

  // Check for AVX2 on x64
  let needsBaseline = false
  if (arch === "x64" && (platform === "linux" || platform === "darwin")) {
    try {
      if (platform === "linux") {
        const cpuinfo = fs.readFileSync("/proc/cpuinfo", "utf8")
        needsBaseline = !cpuinfo.toLowerCase().includes("avx2")
      } else if (platform === "darwin") {
        const result = spawnSync("sysctl", ["-n", "hw.optional.avx2_0"], { encoding: "utf8" })
        needsBaseline = result.stdout.trim() !== "1"
      }
    } catch {}
  }

  // Check for musl on Linux
  let abi = ""
  if (platform === "linux") {
    try {
      if (fs.existsSync("/etc/alpine-release")) {
        abi = "musl"
      } else {
        const result = spawnSync("ldd", ["--version"], { encoding: "utf8" })
        if ((result.stdout + result.stderr).toLowerCase().includes("musl")) {
          abi = "musl"
        }
      }
    } catch {}
  }

  return { platform, arch, needsBaseline, abi }
}

async function getVersion() {
  try {
    const res = await fetch(`https://${GITEA_HOST}/api/v1/repos/${GITEA_REPO}/releases/latest`)
    const data = await res.json()
    return data.tag_name?.replace(/^v/, "") || "1.0.0"
  } catch {
    return "1.0.0"
  }
}

async function downloadBinary() {
  const { platform, arch, needsBaseline, abi } = detectPlatform()
  const version = await getVersion()

  // Check if binary already exists (included in npm package)
  const binaryName = platform === "windows" ? "tfcode.exe" : "tfcode"
  const binDir = path.join(__dirname, "bin")
  const existingBinary = path.join(binDir, binaryName)

  if (fs.existsSync(existingBinary)) {
    console.log(`✓ Binary already exists at ${existingBinary}`)
    return
  }

  // Build filename for download
  let target = `tfcode-${platform}-${arch}`
  if (needsBaseline) target += "-baseline"
  if (abi) target += `-${abi}`

  const ext = platform === "linux" ? ".tar.gz" : ".zip"
  const filename = `${target}${ext}`
  const url = `https://${GITEA_HOST}/${GITEA_REPO}/releases/download/v${version}/${filename}`

  console.log(`Downloading tfcode v${version} for ${target}...`)

  // Download
  if (!fs.existsSync(binDir)) fs.mkdirSync(binDir, { recursive: true })

  const tmpDir = path.join(os.tmpdir(), `tfcode-install-${process.pid}`)
  fs.mkdirSync(tmpDir, { recursive: true })
  const archivePath = path.join(tmpDir, filename)

  // Use curl to download
  const curlResult = spawnSync("curl", ["-fsSL", "-o", archivePath, url], { stdio: "inherit" })
  if (curlResult.status !== 0) {
    console.error(`Failed to download from ${url}`)
    console.error("Trying npm package fallback...")

    // Fallback to npm optionalDependencies
    try {
      const pkgName = `@toothfairyai/${target}`

      // ESM-compatible module resolution
      let pkgDir
      try {
        const pkgUrl = import.meta.resolve(`${pkgName}/package.json`)
        const pkgPath = fileURLToPath(pkgUrl)
        pkgDir = path.dirname(pkgPath)
      } catch (e) {
        console.error(`Could not resolve ${pkgName}:`, e.message)
        throw e
      }

      const binaryName = platform === "windows" ? "tfcode.exe" : "tfcode"
      const binaryPath = path.join(pkgDir, "bin", binaryName)

      console.log(`Looking for binary at: ${binaryPath}`)

      if (fs.existsSync(binaryPath)) {
        console.log(`Found binary at npm package location`)
        setupBinary(binaryPath, platform)
        return
      } else {
        console.error(`Binary not found at ${binaryPath}`)
      }
    } catch (e) {
      console.error("npm package fallback failed:", e.message)
    }

    console.error("")
    console.error("Installation failed. The binary could not be downloaded or found.")
    console.error("")
    console.error("Possible solutions:")
    console.error("  1. If this is a private installation, set TFCODE_GITEA_HOST to an accessible host")
    console.error("  2. Manually download the binary and place it in the bin/ directory")
    console.error("  3. Contact ToothFairyAI support for assistance")
    console.error("")
    process.exit(1)
  }

  // Extract
  console.log("Extracting...")
  if (platform === "linux") {
    spawnSync("tar", ["-xzf", archivePath, "-C", tmpDir], { stdio: "inherit" })
  } else {
    spawnSync("unzip", ["-q", archivePath, "-d", tmpDir], { stdio: "inherit" })
  }

  // Move binary
  const extractedBinary = path.join(tmpDir, "tfcode")
  const targetBinary = path.join(binDir, binaryName)

  if (fs.existsSync(extractedBinary)) {
    if (fs.existsSync(targetBinary)) fs.unlinkSync(targetBinary)
    fs.copyFileSync(extractedBinary, targetBinary)
    fs.chmodSync(targetBinary, 0o755)
    console.log(`Installed tfcode to ${targetBinary}`)
  }

  // Cleanup
  fs.rmSync(tmpDir, { recursive: true, force: true })
}

function setupBinary(sourcePath, platform) {
  const binDir = path.join(__dirname, "bin")
  const binaryName = platform === "windows" ? "tfcode.exe" : "tfcode"
  const targetBinary = path.join(binDir, binaryName)

  if (!fs.existsSync(binDir)) fs.mkdirSync(binDir, { recursive: true })
  if (fs.existsSync(targetBinary)) fs.unlinkSync(targetBinary)

  // Try hardlink, fall back to copy
  try {
    fs.linkSync(sourcePath, targetBinary)
  } catch {
    fs.copyFileSync(sourcePath, targetBinary)
  }

  fs.chmodSync(targetBinary, 0o755)
  console.log(`tfcode installed to ${targetBinary}`)
}

async function main() {
  console.log("")
  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
  console.log("  tfcode - ToothFairyAI's official coding agent")
  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
  console.log("")

  // Download and setup binary
  await downloadBinary()

  // Check for Python (needed for TF integration)
  try {
    const result = spawnSync("python3", ["--version"], { encoding: "utf8" })
    if (result.status === 0) {
      console.log(`✓ Found ${result.stdout.trim()}`)

      // Install Python SDK
      console.log("Installing ToothFairyAI Python SDK...")
      const pipResult = spawnSync(
        "python3",
        ["-m", "pip", "install", "--user", "--break-system-packages", "toothfairyai", "pydantic", "httpx", "rich"],
        {
          stdio: "inherit",
        },
      )

      if (pipResult.status === 0) {
        console.log("✓ Python SDK installed")
      } else {
        console.log("! Python SDK install failed, run manually:")
        console.log("  pip install toothfairyai pydantic httpx rich")
      }
    }
  } catch {
    console.log("! Python 3.10+ not found. Install with:")
    console.log("  macOS:  brew install python@3.12")
    console.log("  Ubuntu: sudo apt install python3.12")
    console.log("  Windows: Download from python.org/downloads")
    console.log("")
  }

  console.log("")
  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
  console.log("✓ tfcode installed successfully!")
  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
  console.log("")
  console.log("Quick Start:")
  console.log("")
  console.log("  1. Set credentials:")
  console.log('     export TF_WORKSPACE_ID="your-workspace-id"')
  console.log('     export TF_API_KEY="your-api-key"')
  console.log("")
  console.log("  2. Validate:")
  console.log("     tfcode validate")
  console.log("")
  console.log("  3. Sync tools:")
  console.log("     tfcode sync")
  console.log("")
  console.log("  4. Start coding:")
  console.log("     tfcode")
  console.log("")
  console.log("Documentation: https://toothfairyai.com/developers/tfcode")
  console.log("")
}

main().catch(console.error)