#!/bin/bash
# Git OpenTimestamp Hooks Installer
# Detects available tools and installs matching hooks

set -e

REPO_PATH="${1:-.}"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

cd "$REPO_PATH"

if ! git rev-parse --git-dir > /dev/null 2>&1; then
    echo "Error: not a git repository" >&2
    exit 1
fi

HOOKS_DIR="$(git rev-parse --git-dir)/hooks"
MODE=""

# Detect available tools
if command -v ots &> /dev/null; then
    MODE="ots"
    echo "Detected: ots CLI"
elif command -v node &> /dev/null && node -e "require('@opentimestamps/ots')" &> /dev/null 2>&1; then
    MODE="node"
    echo "Detected: @opentimestamps/ots (Node.js)"
    echo "Note: Node version creates local proofs only (no calendar submission)"
    echo ""
    
    # Install node package locally if not already present
    if [ ! -d "node_modules/@opentimestamps" ]; then
        echo "Installing @opentimestamps/ots locally..."
        npm install @opentimestamps/ots
        echo "✓ Package installed"
    fi
else
    echo "Error: Neither ots CLI nor @opentimestamps/ots found" >&2
    echo "Install one of:" >&2
    echo "  pipx install opentimestamps-client  (recommended)" >&2
    echo "  npm install @opentimestamps/ots     (local proofs only)" >&2
    exit 1
fi

echo ""
echo "Installing $MODE hooks to: $HOOKS_DIR"

# Copy appropriate hooks
if [ "$MODE" = "ots" ]; then
    cp "$SCRIPT_DIR/post-commit-ots" "$HOOKS_DIR/post-commit"
    cp "$SCRIPT_DIR/pre-commit-ots" "$HOOKS_DIR/pre-commit"
else
    cp "$SCRIPT_DIR/post-commit-node" "$HOOKS_DIR/post-commit"
    cp "$SCRIPT_DIR/pre-commit-node" "$HOOKS_DIR/pre-commit"
fi

chmod +x "$HOOKS_DIR/post-commit" "$HOOKS_DIR/pre-commit"

echo "✓ Post-commit hook installed"
echo "✓ Pre-commit backfill hook installed"

# Setup .gitignore
GITIGNORE=".gitignore"
if [ ! -f "$GITIGNORE" ]; then
    cat > "$GITIGNORE" << 'EOF'
.ots/.attestation-cache
node_modules/
EOF
    echo "✓ Created .gitignore"
elif ! grep -q ".ots/.attestation-cache" "$GITIGNORE"; then
    echo ".ots/.attestation-cache" >> "$GITIGNORE"
    if [ "$MODE" = "node" ] && ! grep -q "node_modules/" "$GITIGNORE"; then
        echo "node_modules/" >> "$GITIGNORE"
    fi
    echo "✓ Updated .gitignore"
fi

echo ""
echo "Mode: $MODE"
if [ "$MODE" = "ots" ]; then
    echo "  - Full Bitcoin attestation via calendars"
    echo "  - Proofs submitted to remote calendars"
else
    echo "  - Local proofs only (no calendar submission)"
    echo "  - For full attestation, use: pipx install opentimestamps-client"
fi

echo ""
echo "Next steps:"
echo "1. Make a test commit"
echo "2. Commit proofs: git add .ots/ && git commit -m 'Add OpenTimestamp proofs'"
echo ""
echo "To uninstall:"
echo "  rm $HOOKS_DIR/post-commit $HOOKS_DIR/pre-commit"