#!/usr/bin/env node

const childProcess = require("child_process")
const fs = require("fs")
const path = require("path")
const os = require("os")

function run(target) {
  const result = childProcess.spawnSync(target, process.argv.slice(2), {
    stdio: "inherit",
  })
  if (result.error) {
    console.error(result.error.message)
    process.exit(1)
  }
  const code = typeof result.status === "number" ? result.status : 0
  process.exit(code)
}

const envPath = process.env.OPENCODE_BIN_PATH
if (envPath) {
  run(envPath)
}

const scriptPath = fs.realpathSync(__filename)
const scriptDir = path.dirname(scriptPath)

//
const cached = path.join(scriptDir, ".opencode")
if (fs.existsSync(cached)) {
  run(cached)
}

const platformMap = {
  darwin: "darwin",
  linux: "linux",
  win32: "windows",
}
const archMap = {
  x64: "x64",
  arm64: "arm64",
  arm: "arm",
}

let platform = platformMap[os.platform()]
if (!platform) {
  platform = os.platform()
}
let arch = archMap[os.arch()]
if (!arch) {
  arch = os.arch()
}
const base = "opencode-" + platform + "-" + arch
const binary = platform === "windows" ? "opencode.exe" : "opencode"

function supportsAvx2() {
  if (arch !== "x64") return false

  if (platform === "linux") {
    try {
      return /(^|\s)avx2(\s|$)/i.test(fs.readFileSync("/proc/cpuinfo", "utf8"))
    } catch {
      return false
    }
  }

  if (platform === "darwin") {
    try {
      const result = childProcess.spawnSync("sysctl", ["-n", "hw.optional.avx2_0"], {
        encoding: "utf8",
        timeout: 1500,
      })
      if (result.status !== 0) return false
      return (result.stdout || "").trim() === "1"
    } catch {
      return false
    }
  }

  if (platform === "windows") {
    const cmd =
      '(Add-Type -MemberDefinition "[DllImport(""kernel32.dll"")] public static extern bool IsProcessorFeaturePresent(int ProcessorFeature);" -Name Kernel32 -Namespace Win32 -PassThru)::IsProcessorFeaturePresent(40)'

    for (const exe of ["powershell.exe", "pwsh.exe", "pwsh", "powershell"]) {
      try {
        const result = childProcess.spawnSync(exe, ["-NoProfile", "-NonInteractive", "-Command", cmd], {
          encoding: "utf8",
          timeout: 3000,
          windowsHide: true,
        })
        if (result.status !== 0) continue
        const out = (result.stdout || "").trim().toLowerCase()
        if (out === "true" || out === "1") return true
        if (out === "false" || out === "0") return false
      } catch {
        continue
      }
    }

    return false
  }

  return false
}

const names = (() => {
  const avx2 = supportsAvx2()
  const baseline = arch === "x64" && !avx2

  if (platform === "linux") {
    const musl = (() => {
      try {
        if (fs.existsSync("/etc/alpine-release")) return true
      } catch {
        // ignore
      }

      try {
        const result = childProcess.spawnSync("ldd", ["--version"], { encoding: "utf8" })
        const text = ((result.stdout || "") + (result.stderr || "")).toLowerCase()
        if (text.includes("musl")) return true
      } catch {
        // ignore
      }

      return false
    })()

    if (musl) {
      if (arch === "x64") {
        if (baseline) return [`${base}-baseline-musl`, `${base}-musl`, `${base}-baseline`, base]
        return [`${base}-musl`, `${base}-baseline-musl`, base, `${base}-baseline`]
      }
      return [`${base}-musl`, base]
    }

    if (arch === "x64") {
      if (baseline) return [`${base}-baseline`, base, `${base}-baseline-musl`, `${base}-musl`]
      return [base, `${base}-baseline`, `${base}-musl`, `${base}-baseline-musl`]
    }
    return [base, `${base}-musl`]
  }

  if (arch === "x64") {
    if (baseline) return [`${base}-baseline`, base]
    return [base, `${base}-baseline`]
  }
  return [base]
})()

function findBinary(startDir) {
  let current = startDir
  for (;;) {
    const modules = path.join(current, "node_modules")
    if (fs.existsSync(modules)) {
      for (const name of names) {
        const candidate = path.join(modules, name, "bin", binary)
        if (fs.existsSync(candidate)) return candidate
      }
    }
    const parent = path.dirname(current)
    if (parent === current) {
      return
    }
    current = parent
  }
}

const resolved = findBinary(scriptDir)
if (!resolved) {
  console.error(
    "It seems that your package manager failed to install the right version of the opencode CLI for your platform. You can try manually installing " +
      names.map((n) => `\"${n}\"`).join(" or ") +
      " package",
  )
  process.exit(1)
}

run(resolved)
