#!/bin/bash

# Slackware build script for claude-code-bin

# Copyright 2026 danix <danix@danix.xyz>
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cd $(dirname $0) ; CWD=$(pwd)

PRGNAM=claude-code-bin
SRCNAM=claude
VERSION=${VERSION:-2.1.123}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
  exit 0
fi

TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
  echo "ERROR: claude-code-bin is not supported on 32-bit x86" >&2
  exit 1
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
  echo "ERROR: claude-code-bin is not supported on 32-bit x86" >&2
  exit 1
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  ARCH_LABEL="x86_64"
  PLATFORM="linux-x64"
elif [ "$ARCH" = "aarch64" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX="64"
  ARCH_LABEL="aarch64"
  PLATFORM="linux-arm64"
else
  echo "ERROR: Unsupported architecture: $ARCH" >&2
  exit 1
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP

# Check for required downloader
DOWNLOADER=""
if command -v curl >/dev/null 2>&1; then
  DOWNLOADER="curl"
elif command -v wget >/dev/null 2>&1; then
  DOWNLOADER="wget"
else
  echo "ERROR: curl or wget is required but neither is installed" >&2
  exit 1
fi

# Check if jq is available (optional)
HAS_JQ=false
if command -v jq >/dev/null 2>&1; then
  HAS_JQ=true
fi

# Download function that works with both curl and wget
download_file() {
  local url="$1"
  local output="$2"

  if [ "$DOWNLOADER" = "curl" ]; then
    if [ -n "$output" ]; then
      curl -fsSL -o "$output" "$url"
    else
      curl -fsSL "$url"
    fi
  elif [ "$DOWNLOADER" = "wget" ]; then
    if [ -n "$output" ]; then
      wget -q -O "$output" "$url"
    else
      wget -q -O - "$url"
    fi
  else
    return 1
  fi
}

# Simple JSON parser for extracting checksum when jq is not available
get_checksum_from_manifest() {
  local json="$1"
  local platform="$2"

  # Normalize JSON to single line and extract checksum
  json=$(echo "$json" | tr -d '\n\r\t' | sed 's/ \+/ /g')

  # Extract checksum for platform using bash regex
  if [[ $json =~ \"$platform\"[^}]*\"checksum\"[[:space:]]*:[[:space:]]*\"([a-f0-9]{64})\" ]]; then
    echo "${BASH_REMATCH[1]}"
    return 0
  fi

  return 1
}

DOWNLOAD_BASE_URL="https://downloads.claude.ai/claude-code-releases"

# Resolve version if set to 'latest'
if [ "$VERSION" = "latest" ]; then
  echo "Fetching latest version tag..."
  RESOLVED_VERSION=$(download_file "$DOWNLOAD_BASE_URL/latest")
  if [ -z "$RESOLVED_VERSION" ]; then
    echo "ERROR: Could not resolve latest version" >&2
    exit 1
  fi
else
  RESOLVED_VERSION="$VERSION"
fi

echo "Building claude-code-bin version: $RESOLVED_VERSION"

# Download manifest and extract checksum
echo "Fetching manifest..."
MANIFEST_JSON=$(download_file "$DOWNLOAD_BASE_URL/$RESOLVED_VERSION/manifest.json")

# Use jq if available, otherwise fall back to pure bash parsing
if [ "$HAS_JQ" = "true" ]; then
  CHECKSUM=$(echo "$MANIFEST_JSON" | jq -r ".platforms[\"$PLATFORM\"].checksum // empty")
else
  CHECKSUM=$(get_checksum_from_manifest "$MANIFEST_JSON" "$PLATFORM")
fi

if [ -z "$CHECKSUM" ] || [[ ! "$CHECKSUM" =~ ^[a-f0-9]{64}$ ]]; then
  echo "ERROR: Could not get checksum for platform $PLATFORM from manifest" >&2
  exit 1
fi

echo "SHA-256 checksum for $PLATFORM: $CHECKSUM"

# Download and verify binary
BINARY_PATH="$TMP/claude-$RESOLVED_VERSION-$PLATFORM"

echo "Downloading claude binary..."
if ! download_file "$DOWNLOAD_BASE_URL/$RESOLVED_VERSION/$PLATFORM/claude" "$BINARY_PATH"; then
  echo "ERROR: Download failed" >&2
  rm -f "$BINARY_PATH"
  exit 1
fi

echo "Verifying SHA-256 checksum..."
ACTUAL_CHECKSUM=$(sha256sum "$BINARY_PATH" | cut -d' ' -f1)
if [ "$ACTUAL_CHECKSUM" != "$CHECKSUM" ]; then
  echo "ERROR: SHA-256 checksum mismatch" >&2
  echo "  Expected: $CHECKSUM" >&2
  echo "  Got:      $ACTUAL_CHECKSUM" >&2
  rm -f "$BINARY_PATH"
  exit 1
fi

echo "Checksum verified successfully"

chmod +x "$BINARY_PATH"

# Install binary to /usr/bin
mkdir -p $PKG/usr/bin
install -D -m 0755 "$BINARY_PATH" $PKG/usr/bin/claude

# Copy documentation
mkdir -p $PKG/usr/doc/$PRGNAM-$RESOLVED_VERSION
cat $CWD/README > $PKG/usr/doc/$PRGNAM-$RESOLVED_VERSION/README
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$RESOLVED_VERSION/$PRGNAM.SlackBuild

# Install slack-desc (doinst.sh is not needed for this package)
mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

# Remove downloaded binary
rm -f "$BINARY_PATH"

# Create the package
cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH_LABEL-$BUILD$TAG.$PKGTYPE