#!/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
    libc=$(ldd /bin/ls | grep 'musl' | head -1 | cut -d ' ' -f1)
    if [ -n "$libc" ]; then
      musl="-musl"
    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"
  elif command -v zstd >/dev/null 2>&1; then
    echo "tar.zst"
  else
    echo "tar.gz"
  fi
}

tar_supports_zstd() {
  # tar is bsdtar or version is >= 1.31
  if tar --version | grep -q 'bsdtar' && command -v zstd >/dev/null 2>&1; then
    true
  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=$1
  os="$(get_os)"
  arch="$(get_arch)"
  ext="$(get_ext)"
  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" = "v2025.4.5" ]; then
    checksum_linux_x86_64="01c24aa2bacf7f7d6c7e0178776c14059c56a163a15aecff95468378aee1afae  ./mise-v2025.4.5-linux-x64.tar.gz"
    checksum_linux_x86_64_musl="75147923b4330582f7561452ba61045fab9deaf9f7c77591d4a171fba17575ee  ./mise-v2025.4.5-linux-x64-musl.tar.gz"
    checksum_linux_arm64="db0ddd9265eefc638f8a064460e917c1113e30c9027dbbbf120ceeff2936e9c4  ./mise-v2025.4.5-linux-arm64.tar.gz"
    checksum_linux_arm64_musl="d4727fa997f02055979e9113214dccbc635d9dfb120fc69ae9fa35e33a1e8b85  ./mise-v2025.4.5-linux-arm64-musl.tar.gz"
    checksum_linux_armv7="27b55b104dc8fbe9bb7462d2695534e72c7220a5a5f3c51a22e41a2b5f8e41b7  ./mise-v2025.4.5-linux-armv7.tar.gz"
    checksum_linux_armv7_musl="4ddffe6f2a296489b06527211ab9552102540bf2dc3a6d7f8727616220455956  ./mise-v2025.4.5-linux-armv7-musl.tar.gz"
    checksum_macos_x86_64="842af2e878acf61bf92e43981f7c61e4bea350c66fd50770f840024461f5d740  ./mise-v2025.4.5-macos-x64.tar.gz"
    checksum_macos_arm64="6c2d98b0b23db51db6f7a10721c6aeb82366dbaa6ebb9c0a93dda312e1fe2dbe  ./mise-v2025.4.5-macos-arm64.tar.gz"
    checksum_linux_x86_64_zstd="5c65a2e3ee06c6af1924b22303f72291bb08d117d1eea794d0877a7f6d1218d8  ./mise-v2025.4.5-linux-x64.tar.zst"
    checksum_linux_x86_64_musl_zstd="6604f0c6a326078db532a04f5986bf8e07b1e9625abc5fc0fe25a0ee174424b7  ./mise-v2025.4.5-linux-x64-musl.tar.zst"
    checksum_linux_arm64_zstd="fe5774e16e16d6dbb28d6e08687459f7d7d3aec0a9ad6e414d49628b317e8d92  ./mise-v2025.4.5-linux-arm64.tar.zst"
    checksum_linux_arm64_musl_zstd="88425ddbe7587272826c248172ff25ec84747ccaa467174e16059b436768d0c1  ./mise-v2025.4.5-linux-arm64-musl.tar.zst"
    checksum_linux_armv7_zstd="3e3954a6888dc5af985703218a0be7f5b4abbaf5961752ac936b866877af8b9a  ./mise-v2025.4.5-linux-armv7.tar.zst"
    checksum_linux_armv7_musl_zstd="daa727fce7247071cf9529f7429e36773a16558c4d6614c0ea6623b08fd14885  ./mise-v2025.4.5-linux-armv7-musl.tar.zst"
    checksum_macos_x86_64_zstd="069f955f2626f368cdde5f25c770f79011fb3e52e9f6b05cef5523a4428246f8  ./mise-v2025.4.5-macos-x64.tar.zst"
    checksum_macos_arm64_zstd="f6d862b43826d581da45641b1e40377ef5df01268153a969960e38879d1befe2  ./mise-v2025.4.5-macos-arm64.tar.zst"

    # TODO: refactor this, it's a bit messy
    if [ "$(get_ext)" = "tar.zst" ]; then
      if [ "$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"
        stderr=$(mktemp)
        checksums="$(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="$1"
  filename="$(basename "$url")"
  cache_dir="$(mktemp -d)"
  file="$cache_dir/$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")"
    else
      error "mise standalone install requires curl or wget but neither is installed. Aborting."
    fi
  fi

  echo "$file"
}

install_mise() {
  version="${MISE_VERSION:-v2025.4.5}"
  version="${version#v}"
  os="$(get_os)"
  arch="$(get_arch)"
  ext="$(get_ext)"
  install_path="${MISE_INSTALL_PATH:-$HOME/.local/bin/mise}"
  install_dir="$(dirname "$install_path")"
  tarball_url="https://github.com/jdx/mise/releases/download/v${version}/mise-v${version}-${os}-${arch}.${ext}"

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

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

  # extract tarball
  mkdir -p "$install_dir"
  rm -rf "$install_path"
  cd "$(mktemp -d)"
  if [ "$(get_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"
  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 setup correctly"
    ;;
  */bash)
    info "mise: run the following to activate mise in your shell:"
    info "echo \"eval \\\"\\\$($install_path activate bash)\\\"\" >> ~/.bashrc"
    info ""
    info "mise: run \`mise doctor\` to verify this is setup correctly"
    ;;
  */fish)
    info "mise: run the following to activate mise in your shell:"
    info "echo \"$install_path activate fish | source\" >> ~/.config/fish/config.fish"
    info ""
    info "mise: run \`mise doctor\` to verify this is setup correctly"
    ;;
  *)
    info "mise: run \`$install_path --help\` to get started"
    ;;
  esac
}

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