#!/usr/bin/env bash
# create-release-manifest.sh — Build a release manifest for the Archipelago update system.
#
# Generates a JSON manifest with version info, changelog, and SHA256 hashes for
# each component, matching the format expected by core/archipelago/src/update.rs.
#
# Usage:
#   ./scripts/create-release-manifest.sh --version 0.2.0 --date 2026-04-01
#
# The script reads built artifacts from the build output directories and produces
# a manifest.json file suitable for hosting at the UPDATE_MANIFEST_URL.

set -euo pipefail

# Defaults
VERSION=""
RELEASE_DATE=""
OUTPUT_FILE="manifest.json"
BACKEND_BINARY=""
FRONTEND_ARCHIVE=""
BASE_URL="https://github.com/archipelago-os/releases/releases/download"

usage() {
    echo "Usage: $0 --version VERSION [--date DATE] [--output FILE]"
    echo ""
    echo "Options:"
    echo "  --version VERSION    Release version (e.g., 0.2.0) [required]"
    echo "  --date DATE          Release date (YYYY-MM-DD) [default: today]"
    echo "  --output FILE        Output manifest path [default: manifest.json]"
    echo "  --backend PATH       Path to backend binary [default: auto-detect]"
    echo "  --frontend PATH      Path to frontend archive [default: auto-detect]"
    echo "  --base-url URL       Base download URL [default: GitHub releases]"
    exit 1
}

# Parse arguments
while [[ $# -gt 0 ]]; do
    case "$1" in
        --version) VERSION="$2"; shift 2 ;;
        --date) RELEASE_DATE="$2"; shift 2 ;;
        --output) OUTPUT_FILE="$2"; shift 2 ;;
        --backend) BACKEND_BINARY="$2"; shift 2 ;;
        --frontend) FRONTEND_ARCHIVE="$2"; shift 2 ;;
        --base-url) BASE_URL="$2"; shift 2 ;;
        -h|--help) usage ;;
        *) echo "Unknown option: $1"; usage ;;
    esac
done

if [ -z "$VERSION" ]; then
    echo "Error: --version is required"
    usage
fi

if [ -z "$RELEASE_DATE" ]; then
    RELEASE_DATE=$(date +%Y-%m-%d)
fi

# Find project root
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"

# Auto-detect backend binary
if [ -z "$BACKEND_BINARY" ]; then
    BACKEND_BINARY="$PROJECT_ROOT/core/target/release/archipelago"
fi

# Auto-detect frontend archive
if [ -z "$FRONTEND_ARCHIVE" ]; then
    FRONTEND_DIST="$PROJECT_ROOT/web/dist/neode-ui"
    if [ -d "$FRONTEND_DIST" ]; then
        FRONTEND_ARCHIVE="/tmp/archipelago-frontend-${VERSION}.tar.gz"
        echo "Creating frontend archive from $FRONTEND_DIST..."
        tar -czf "$FRONTEND_ARCHIVE" -C "$PROJECT_ROOT/web/dist" neode-ui
    fi
fi

# Compute SHA256 hash
sha256_of() {
    if command -v sha256sum &>/dev/null; then
        sha256sum "$1" | awk '{print $1}'
    else
        shasum -a 256 "$1" | awk '{print $1}'
    fi
}

# File size in bytes
size_of() {
    if [[ "$(uname)" == "Darwin" ]]; then
        stat -f%z "$1"
    else
        stat -c%s "$1"
    fi
}

# Get current version from Cargo.toml
CURRENT_VERSION=$(grep '^version' "$PROJECT_ROOT/core/archipelago/Cargo.toml" | head -1 | sed 's/.*"\(.*\)".*/\1/')

echo "Building release manifest v${VERSION}"
echo "  Current version: ${CURRENT_VERSION}"
echo "  Release date: ${RELEASE_DATE}"
echo "  Output: ${OUTPUT_FILE}"

# Build components array
COMPONENTS="[]"

if [ -f "$BACKEND_BINARY" ]; then
    HASH=$(sha256_of "$BACKEND_BINARY")
    SIZE=$(size_of "$BACKEND_BINARY")
    echo "  Backend binary: ${BACKEND_BINARY} (${SIZE} bytes, sha256: ${HASH})"
    COMPONENTS=$(echo "$COMPONENTS" | python3 -c "
import sys, json
c = json.load(sys.stdin)
c.append({
    'name': 'archipelago',
    'current_version': '$CURRENT_VERSION',
    'new_version': '$VERSION',
    'download_url': '$BASE_URL/v$VERSION/archipelago',
    'sha256': '$HASH',
    'size_bytes': $SIZE
})
print(json.dumps(c))
")
else
    echo "  Warning: Backend binary not found at $BACKEND_BINARY"
fi

if [ -n "$FRONTEND_ARCHIVE" ] && [ -f "$FRONTEND_ARCHIVE" ]; then
    HASH=$(sha256_of "$FRONTEND_ARCHIVE")
    SIZE=$(size_of "$FRONTEND_ARCHIVE")
    ARCHIVE_NAME=$(basename "$FRONTEND_ARCHIVE")
    echo "  Frontend archive: ${FRONTEND_ARCHIVE} (${SIZE} bytes, sha256: ${HASH})"
    COMPONENTS=$(echo "$COMPONENTS" | python3 -c "
import sys, json
c = json.load(sys.stdin)
c.append({
    'name': '$ARCHIVE_NAME',
    'current_version': '$CURRENT_VERSION',
    'new_version': '$VERSION',
    'download_url': '$BASE_URL/v$VERSION/$ARCHIVE_NAME',
    'sha256': '$HASH',
    'size_bytes': $SIZE
})
print(json.dumps(c))
")
else
    echo "  Warning: Frontend archive not found"
fi

# Read changelog from CHANGELOG.md if available
CHANGELOG="[]"
CHANGELOG_FILE="$PROJECT_ROOT/CHANGELOG.md"
if [ -f "$CHANGELOG_FILE" ]; then
    # Extract entries for this version (lines between ## vVERSION and next ##)
    ENTRIES=$(python3 -c "
import re, sys
content = open('$CHANGELOG_FILE').read()
pattern = r'## .*?${VERSION}.*?\n(.*?)(?=\n## |\Z)'
m = re.search(pattern, content, re.DOTALL)
if m:
    for line in m.group(1).strip().split('\n')[:10]:
        line = line.strip()
        if line:
            print(line)
" 2>/dev/null || echo "")
    if [ -n "$ENTRIES" ]; then
        CHANGELOG=$(echo "$ENTRIES" | python3 -c "
import sys, json
lines = [l.strip().lstrip('- ') for l in sys.stdin if l.strip()]
print(json.dumps(lines))
")
    fi
fi

# If no changelog entries found, add a default
if [ "$CHANGELOG" = "[]" ]; then
    CHANGELOG="[\"Update to version ${VERSION}\"]"
fi

# Generate manifest
python3 -c "
import json
manifest = {
    'version': '$VERSION',
    'release_date': '$RELEASE_DATE',
    'changelog': $CHANGELOG,
    'components': $COMPONENTS
}
print(json.dumps(manifest, indent=2))
" > "$OUTPUT_FILE"

echo ""
echo "Manifest written to: $OUTPUT_FILE"
echo ""
cat "$OUTPUT_FILE"
echo ""
echo "Next steps:"
echo "  1. Review the manifest above"
echo "  2. Upload artifacts to: $BASE_URL/v$VERSION/"
echo "  3. Upload manifest.json to the releases repo main branch"
echo "  4. Tag the release: git tag v$VERSION && git push --tags"