#!/usr/bin/env bash
# ============================================================
# Kordant Release Keystore Generator
# ============================================================
#
# Generates a release keystore and upload key for Google Play.
# Also creates the key.properties file for Gradle signing.
#
# Usage:
#   ./scripts/generate-release-key.sh
#
# Output:
#   - kordant-release.keystore (in android/ directory)
#   - key.properties (in android/ directory, added to .gitignore)
#
# Security:
#   - Store the keystore in a secure location (password manager, HSM)
#   - Back up the keystore — losing it means losing ability to update the app
#   - The upload key is ONLY for uploading to Play Console
#   - Google Play App Signing manages the actual app signing key
# ============================================================

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
KEYSTORE_PATH="$PROJECT_DIR/kordant-release.keystore"
KEY_PROPS_PATH="$PROJECT_DIR/key.properties"
KEY_ALIAS="kordant-release-key"
KEY_VALIDITY=25550  # ~70 years (max for Java keytool)

echo "============================================"
echo "  Kordant Release Keystore Generator"
echo "============================================"
echo ""

# Check if keytool is available
if ! command -v keytool &> /dev/null; then
    echo "ERROR: keytool not found. Install Java JDK."
    exit 1
fi

# Check if keystore already exists
if [ -f "$KEYSTORE_PATH" ]; then
    echo "WARNING: Keystore already exists at $KEYSTORE_PATH"
    echo ""
    read -p "Overwrite existing keystore? (y/N): " confirm
    if [[ ! "$confirm" =~ ^[Yy]$ ]]; then
        echo "Aborted. Keystore not overwritten."
        exit 0
    fi
fi

# Collect keystore information
echo "Enter keystore details:"
echo ""
read -p "  Keystore password: " STORE_PASSWORD
read -p "  Confirm password: " STORE_PASSWORD_CONFIRM

if [ "$STORE_PASSWORD" != "$STORE_PASSWORD_CONFIRM" ]; then
    echo "ERROR: Passwords do not match."
    exit 1
fi

read -p "  Key password (enter for same as keystore): " KEY_PASSWORD
KEY_PASSWORD="${KEY_PASSWORD:-$STORE_PASSWORD}"

read -p "  Your name: " CN
read -p "  Organization unit (OU): " OU
read -p "  Organization (O): " O
read -p "  City/Locality (L): " L
read -p "  State/Province (ST): " ST
read -p "  Country code (C, e.g., US): " C

# Generate the keystore
echo ""
echo "Generating keystore..."
keytool -genkeypair \
    -v \
    -keystore "$KEYSTORE_PATH" \
    -alias "$KEY_ALIAS" \
    -keyalg RSA \
    -keysize 2048 \
    -sigalg SHA256withRSA \
    -storetype JKS \
    -storepass "$STORE_PASSWORD" \
    -keypass "$KEY_PASSWORD" \
    -validity "$KEY_VALIDITY" \
    -dname "CN=$CN, OU=$OU, O=$O, L=$L, ST=$ST, C=$C"

echo ""
echo "✓ Keystore generated: $KEYSTORE_PATH"

# Extract the public key hash for Google Play App Signing
echo ""
echo "Extracting certificate fingerprint..."
CERT_SHA256=$(keytool -list -v \
    -keystore "$KEYSTORE_PATH" \
    -alias "$KEY_ALIAS" \
    -storepass "$STORE_PASSWORD" \
    -keypass "$KEY_PASSWORD" \
    2>/dev/null | grep "SHA256:" | awk '{print $2}')

echo "  SHA-256: $CERT_SHA256"

# Generate key.properties
echo ""
echo "Creating key.properties..."
cat > "$KEY_PROPS_PATH" << EOF
# ============================================================
# Kordant Release Keystore Configuration
# Auto-generated on $(date -u +"%Y-%m-%dT%H:%M:%SZ")
# ============================================================
#
# IMPORTANT: This file contains sensitive credentials.
# NEVER commit this file to version control.
# ============================================================

storeFile=../kordant-release.keystore
storePassword=$STORE_PASSWORD
keyAlias=$KEY_ALIAS
keyPassword=$KEY_PASSWORD
EOF

echo "✓ key.properties created: $KEY_PROPS_PATH"

# Verify the keystore
echo ""
echo "Verifying keystore..."
keytool -list -v \
    -keystore "$KEYSTORE_PATH" \
    -storepass "$STORE_PASSWORD" \
    2>/dev/null | head -20

echo ""
echo "============================================"
echo "  Next Steps"
echo "============================================"
echo ""
echo "1. Back up the keystore securely:"
echo "   - Store in password manager (1Password, Bitwarden, etc.)"
echo "   - Keep an offline copy in a safe"
echo "   - DO NOT commit to version control"
echo ""
echo "2. Upload to Google Play Console:"
echo "   - Go to Play Console → Setup → App integrity → App signing"
echo "   - Upload the keystore or its certificate"
echo "   - Enable Google Play App Signing"
echo ""
echo "3. Build the release AAB:"
echo "   cd android && ./gradlew bundleProdRelease"
echo ""
echo "4. Upload the AAB to Play Console:"
echo "   - Play Console → Testing → Internal testing → Create release"
echo "   - Upload app/bundle/release/app-prod-release.aab"
echo ""
echo "============================================"