#!/bin/bash
# Git OpenTimestamp Hooks Installer
# Requires: opentimestamps-client (ots CLI)

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

# Check for ots CLI (required)
if ! command -v ots &> /dev/null; then
    echo "Error: ots CLI not found" >&2
    echo "" >&2
    echo "OpenTimestamp client is required for full Bitcoin attestation." >&2
    echo "Install with one of:" >&2
    echo "" >&2
    echo "  # Recommended (isolated install)" >&2
    echo "  pipx install opentimestamps-client" >&2
    echo "" >&2
    echo "  # Or with pip" >&2
    echo "  pip install opentimestamps-client" >&2
    echo "" >&2
    echo "  # Or from source" >&2
    echo "  git clone https://github.com/opentimestamps/opentimestamps-client" >&2
    echo "  cd opentimestamps-client && pip install ." >&2
    echo "" >&2
    exit 1
fi

echo "✓ Detected: ots CLI ($(ots --version))"

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

echo "Installing hooks to: $HOOKS_DIR"

# Copy hooks
cp "$SCRIPT_DIR/post-commit" "$HOOKS_DIR/post-commit"
cp "$SCRIPT_DIR/pre-commit" "$HOOKS_DIR/pre-commit"

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 "$GITIGNORE" ]; then
    echo ".ots/.attestation-cache" > "$GITIGNORE"
    echo "✓ Created .gitignore"
elif ! grep -q ".ots/.attestation-cache" "$GITIGNORE"; then
    echo ".ots/.attestation-cache" >> "$GITIGNORE"
    echo "✓ Updated .gitignore"
fi

echo ""
echo "Configuration:"
echo "  - Full Bitcoin attestation via remote calendars"
echo "  - Proofs submitted to 4+ calendar servers"
echo "  - Attestation available after ~10 min (Bitcoin confirmation)"
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"