#!/bin/sh
set -eu

#region logging setup
if [ "${MISE_DEBUG-}" = "true" ] || [ "${MISE_DEBUG-}" = "1" ]; then
  debug() {
    echo "$@" >&2
  }
else
  debug() {
    :
  }
fi

if [ "${MISE_QUIET-}" = "1" ] || [ "${MISE_QUIET-}" = "true" ]; then
  info() {
    :
  }
else
  info() {
    echo "$@" >&2
  }
fi

error() {
  echo "$@" >&2
  exit 1
}
#endregion

#region environment setup
get_os() {
  os="$(uname -s)"
  if [ "$os" = Darwin ]; then
    echo "macos"
  elif [ "$os" = Linux ]; then
    echo "linux"
  else
    error "unsupported OS: $os"
  fi
}

get_arch() {
  musl=""
  if type ldd >/dev/null 2>/dev/null; then
    if [ "${MISE_INSTALL_MUSL-}" = "1" ] || [ "${MISE_INSTALL_MUSL-}" = "true" ]; then
      musl="-musl"
    elif [ "$(uname -o)" = "Android" ]; then
      # Android (Termux) always uses musl
      musl="-musl"
    else
      libc=$(ldd /bin/ls | grep 'musl' | head -1 | cut -d ' ' -f1)
      if [ -n "$libc" ]; then
        musl="-musl"
      fi
    fi
  fi
  arch="$(uname -m)"
  if [ "$arch" = x86_64 ]; then
    echo "x64$musl"
  elif [ "$arch" = aarch64 ] || [ "$arch" = arm64 ]; then
    echo "arm64$musl"
  elif [ "$arch" = armv7l ]; then
    echo "armv7$musl"
  else
    error "unsupported architecture: $arch"
  fi
}

get_ext() {
  if [ -n "${MISE_INSTALL_EXT:-}" ]; then
    echo "$MISE_INSTALL_EXT"
  elif [ -n "${MISE_VERSION:-}" ] && echo "$MISE_VERSION" | grep -q '^v2024'; then
    # 2024 versions don't have zstd tarballs
    echo "tar.gz"
  elif tar_supports_zstd; then
    echo "tar.zst"
  else
    echo "tar.gz"
  fi
}

tar_supports_zstd() {
  if ! command -v zstd >/dev/null 2>&1; then
    false
  # tar is bsdtar
  elif tar --version | grep -q 'bsdtar'; then
    true
  # tar version is >= 1.31
  elif tar --version | grep -q '1\.\(3[1-9]\|[4-9][0-9]\)'; then
    true
  else
    false
  fi
}

shasum_bin() {
  if command -v shasum >/dev/null 2>&1; then
    echo "shasum"
  elif command -v sha256sum >/dev/null 2>&1; then
    echo "sha256sum"
  else
    error "mise install requires shasum or sha256sum but neither is installed. Aborting."
  fi
}

get_checksum() {
  version=$1
  os=$2
  arch=$3
  ext=$4
  url="https://github.com/jdx/mise/releases/download/v${version}/SHASUMS256.txt"

  # For current version use static checksum otherwise
  # use checksum from releases
  if [ "$version" = "v2026.3.9" ]; then
    checksum_linux_x86_64="941d8f0ddb25755b471b8245e847efcaf3d985d78ec24f2858a4316691a0b2bf  ./mise-v2026.3.9-linux-x64.tar.gz"
    checksum_linux_x86_64_musl="dd701f49ef6b29b00b219c7870d91ba894ef401d49ba2863e6931b2318d49c2d  ./mise-v2026.3.9-linux-x64-musl.tar.gz"
    checksum_linux_arm64="6e8acf03a3b749c75adbf3799fe94214707257c1fac1f63eb1f696d0d3ce27fd  ./mise-v2026.3.9-linux-arm64.tar.gz"
    checksum_linux_arm64_musl="669d552aeada350aeb4ea89da2256c4103b6ac731580ec09414b4ec7ef7d4497  ./mise-v2026.3.9-linux-arm64-musl.tar.gz"
    checksum_linux_armv7="36b97e9e081034f6a29e68d54fe41fd9e8a5ac731a3c5a1877f18a82ae93fe71  ./mise-v2026.3.9-linux-armv7.tar.gz"
    checksum_linux_armv7_musl="61ac19ae790b7ebb5be6456037cd509f9778807b892a25657e6dd68296f8dece  ./mise-v2026.3.9-linux-armv7-musl.tar.gz"
    checksum_macos_x86_64="a7cf136155077e7590a6748559377a647d472480fd511810a5f00fb3b91872e5  ./mise-v2026.3.9-macos-x64.tar.gz"
    checksum_macos_arm64="a371ecbad19cda70ab196b8672b7c2161f2f958e1bba8b53cb4d378163a72b37  ./mise-v2026.3.9-macos-arm64.tar.gz"
    checksum_linux_x86_64_zstd="345801a6cab539dc1f7692a96bf51fea2404b2246fdecbada26656077a5e82b9  ./mise-v2026.3.9-linux-x64.tar.zst"
    checksum_linux_x86_64_musl_zstd="754c2404d27f51f14441adc422a23065e44ef8de4ed2f89d4ef3db146341f94f  ./mise-v2026.3.9-linux-x64-musl.tar.zst"
    checksum_linux_arm64_zstd="414ab90cbc55b4e2dc71eb30bcbd68c12847f4cae7841eedd54986ff1a177128  ./mise-v2026.3.9-linux-arm64.tar.zst"
    checksum_linux_arm64_musl_zstd="e9d0edd2ac3831e956225cd3d8a8a35c65221af39408c17695642ed7dd1982ec  ./mise-v2026.3.9-linux-arm64-musl.tar.zst"
    checksum_linux_armv7_zstd="a8e3fc87f04d55523158f0fc28350708fa2c4d0e3e8831e3e147ffdedd9d03d2  ./mise-v2026.3.9-linux-armv7.tar.zst"
    checksum_linux_armv7_musl_zstd="2cd3503508796876293f08eefcb97ba1589c0a870afebbce69959b1d8132b69e  ./mise-v2026.3.9-linux-armv7-musl.tar.zst"
    checksum_macos_x86_64_zstd="354de1b53c05f3e225a55495b940d963e7bc7557796288f5e07f53181dd6a791  ./mise-v2026.3.9-macos-x64.tar.zst"
    checksum_macos_arm64_zstd="076187947c67a370f06c80167a7b443cfd4c2f38ac64e69dffe742b7e57b51bf  ./mise-v2026.3.9-macos-arm64.tar.zst"

    # TODO: refactor this, it's a bit messy
    if [ "$ext" = "tar.zst" ]; then
      if [ "$os" = "linux" ]; then
        if [ "$arch" = "x64" ]; then
          echo "$checksum_linux_x86_64_zstd"
        elif [ "$arch" = "x64-musl" ]; then
          echo "$checksum_linux_x86_64_musl_zstd"
        elif [ "$arch" = "arm64" ]; then
          echo "$checksum_linux_arm64_zstd"
        elif [ "$arch" = "arm64-musl" ]; then
          echo "$checksum_linux_arm64_musl_zstd"
        elif [ "$arch" = "armv7" ]; then
          echo "$checksum_linux_armv7_zstd"
        elif [ "$arch" = "armv7-musl" ]; then
          echo "$checksum_linux_armv7_musl_zstd"
        else
          warn "no checksum for $os-$arch"
        fi
      elif [ "$os" = "macos" ]; then
        if [ "$arch" = "x64" ]; then
          echo "$checksum_macos_x86_64_zstd"
        elif [ "$arch" = "arm64" ]; then
          echo "$checksum_macos_arm64_zstd"
        else
          warn "no checksum for $os-$arch"
        fi
      else
        warn "no checksum for $os-$arch"
      fi
    else
      if [ "$os" = "linux" ]; then
        if [ "$arch" = "x64" ]; then
          echo "$checksum_linux_x86_64"
        elif [ "$arch" = "x64-musl" ]; then
          echo "$checksum_linux_x86_64_musl"
        elif [ "$arch" = "arm64" ]; then
          echo "$checksum_linux_arm64"
        elif [ "$arch" = "arm64-musl" ]; then
          echo "$checksum_linux_arm64_musl"
        elif [ "$arch" = "armv7" ]; then
          echo "$checksum_linux_armv7"
        elif [ "$arch" = "armv7-musl" ]; then
          echo "$checksum_linux_armv7_musl"
        else
          warn "no checksum for $os-$arch"
        fi
      elif [ "$os" = "macos" ]; then
        if [ "$arch" = "x64" ]; then
          echo "$checksum_macos_x86_64"
        elif [ "$arch" = "arm64" ]; then
          echo "$checksum_macos_arm64"
        else
          warn "no checksum for $os-$arch"
        fi
      else
        warn "no checksum for $os-$arch"
      fi
    fi
  else
    if command -v curl >/dev/null 2>&1; then
      debug ">" curl -fsSL "$url"
      checksums="$(curl --compressed -fsSL "$url")"
    else
      if command -v wget >/dev/null 2>&1; then
        debug ">" wget -qO - "$url"
        checksums="$(wget -qO - "$url")"
      else
        error "mise standalone install specific version requires curl or wget but neither is installed. Aborting."
      fi
    fi
    # TODO: verify with minisign or gpg if available

    checksum="$(echo "$checksums" | grep "$os-$arch.$ext")"
    if ! echo "$checksum" | grep -Eq "^([0-9a-f]{32}|[0-9a-f]{64})"; then
      warn "no checksum for mise $version and $os-$arch"
    else
      echo "$checksum"
    fi
  fi
}

#endregion

download_file() {
  url="$1"
  download_dir="$2"
  filename="$(basename "$url")"
  file="$download_dir/$filename"

  info "mise: installing mise..."

  if command -v curl >/dev/null 2>&1; then
    debug ">" curl -#fLo "$file" "$url"
    curl -#fLo "$file" "$url"
  else
    if command -v wget >/dev/null 2>&1; then
      debug ">" wget -qO "$file" "$url"
      stderr=$(mktemp)
      wget -O "$file" "$url" >"$stderr" 2>&1 || error "wget failed: $(cat "$stderr")"
      rm "$stderr"
    else
      error "mise standalone install requires curl or wget but neither is installed. Aborting."
    fi
  fi

  echo "$file"
}

install_mise() {
  version="${MISE_VERSION:-v2026.3.9}"
  version="${version#v}"
  os="${MISE_INSTALL_OS:-$(get_os)}"
  arch="${MISE_INSTALL_ARCH:-$(get_arch)}"
  ext="${MISE_INSTALL_EXT:-$(get_ext)}"
  install_path="${MISE_INSTALL_PATH:-$HOME/.local/bin/mise}"
  install_dir="$(dirname "$install_path")"
  install_from_github="${MISE_INSTALL_FROM_GITHUB:-}"
  if [ "$version" != "v2026.3.9" ] || [ "$install_from_github" = "1" ] || [ "$install_from_github" = "true" ]; then
    tarball_url="https://github.com/jdx/mise/releases/download/v${version}/mise-v${version}-${os}-${arch}.${ext}"
  elif [ -n "${MISE_TARBALL_URL-}" ]; then
    tarball_url="$MISE_TARBALL_URL"
  else
    tarball_url="https://mise.jdx.dev/v${version}/mise-v${version}-${os}-${arch}.${ext}"
  fi

  download_dir="$(mktemp -d)"
  cache_file=$(download_file "$tarball_url" "$download_dir")
  debug "mise-setup: tarball=$cache_file"

  debug "validating checksum"
  cd "$(dirname "$cache_file")" && get_checksum "$version" "$os" "$arch" "$ext" | "$(shasum_bin)" -c >/dev/null

  # extract tarball
  if [ -d "$install_path" ]; then
    error "MISE_INSTALL_PATH '$install_path' is a directory. Please set it to a file path, e.g. '$install_path/mise'."
  fi
  mkdir -p "$install_dir"
  rm -f "$install_path"
  extract_dir="$(mktemp -d)"
  cd "$extract_dir"
  if [ "$ext" = "tar.zst" ] && ! tar_supports_zstd; then
    zstd -d -c "$cache_file" | tar -xf -
  else
    tar -xf "$cache_file"
  fi
  mv mise/bin/mise "$install_path"

  # cleanup
  cd / # Move out of $extract_dir before removing it
  rm -rf "$download_dir"
  rm -rf "$extract_dir"

  info "mise: installed successfully to $install_path"
}

after_finish_help() {
  case "${SHELL:-}" in
  */zsh)
    info "mise: run the following to activate mise in your shell:"
    info "echo \"eval \\\"\\\$($install_path activate zsh)\\\"\" >> \"${ZDOTDIR-$HOME}/.zshrc\""
    info ""
    info "mise: run \`mise doctor\` to verify this is set up correctly"
    ;;
  */bash)
    info "mise: run the following to activate mise in your shell:"
    info "echo \"eval \\\"\\\$($install_path activate bash)\\\"\" >> ~/.bashrc"
    info ""
    info "mise: run \`mise doctor\` to verify this is set up correctly"
    ;;
  */fish)
    info "mise: run the following to activate mise in your shell:"
    info "echo \"$install_path activate fish | source\" >> ~/.config/fish/config.fish"
    info ""
    info "mise: run \`mise doctor\` to verify this is set up correctly"
    ;;
  *)
    info "mise: run \`$install_path --help\` to get started"
    ;;
  esac
}

install_mise
if [ "${MISE_INSTALL_HELP-}" != 0 ]; then
  after_finish_help
fi