#!/usr/bin/env bash
set -e

GREP_VARIANT=$(grep -V)

function parse_grep_version_to_know_if_it_is_bsd_or_gnu {
  read -r first_line <<< "$GREP_VARIANT"

  if [[ "$first_line" == *"GNU"* ]]; then
    echo "GNU"
  else
    echo "BSD"
  fi
}

GREP_VARIANT=$(parse_grep_version_to_know_if_it_is_bsd_or_gnu)
REPO="jelius-sama/convert_cbz"
VERSION=""

# Fetch latest release tag from GitHub API
if [ "$GREP_VARIANT" = "GNU" ]; then
  VERSION="$(
    curl -s "https://api.github.com/repos/${REPO}/releases/latest" \
    | grep -oP '"tag_name":\s*"\K[^"]+'
  )"
else
  # BSD/macOS grep does not support -P (Perl regex).
  # Use -E (Extended regex) and sed instead.
  VERSION="$(
    curl -s "https://api.github.com/repos/${REPO}/releases/latest" \
    | grep -Eo '"tag_name":\s*"[^"]+"' \
    | sed -E 's/"tag_name":\s*"([^"]+)"/\1/'
  )"
fi

BASE_URL="https://github.com/${REPO}/releases/download/${VERSION}"

OS=$(uname -s | tr '[:upper:]' '[:lower:]')
ARCH=$(uname -m)

case $ARCH in
  x86_64|amd64) ARCH=amd64 ;;
  aarch64|arm64) ARCH=arm64 ;;
  armv7*|armv6*) ARCH=arm ;;
  ppc64le) ARCH=ppc64le ;;
  ppc64) ARCH=ppc64 ;;
  mips64) ARCH=mips64 ;;
  mips64le) ARCH=mips64le ;;
  mips) ARCH=mips ;;
  s390x) ARCH=s390x ;;
  i386|i686) ARCH=386 ;;
  *) echo "[ERROR] Unsupported architecture: $ARCH"; exit 1 ;;
esac

BINARY="convert-cbz-${OS}-${ARCH}"
TEMP_BIN="/tmp/convert-cbz"

echo "[INFO] Detected OS: $OS, Arch: $ARCH"
echo "[INFO] Downloading $BINARY from $BASE_URL"

curl -L -o "$TEMP_BIN" "${BASE_URL}/${BINARY}"
chmod +x "$TEMP_BIN"

echo "[OK] Download complete."

echo "[INFO] Installing to /usr/local/bin/convert-cbz"
sudo mv "$TEMP_BIN" /usr/local/bin/convert-cbz

echo "[OK] Installation complete!"
echo "Run 'convert-cbz -help' to get started."