#!/bin/bash

# ================================================================================================
# ENHANCED TECH STACK SELECTOR - DOCKER STARTUP SCRIPT
# Optimized for Docker environment with proper service discovery
# ================================================================================================

set -e

# Parse command line arguments
FORCE_MIGRATION=false
if [ "$1" = "--force-migration" ] || [ "$1" = "-f" ]; then
    FORCE_MIGRATION=true
    echo "🔄 Force migration mode enabled"
elif [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
    echo "Usage: $0 [OPTIONS]"
    echo ""
    echo "Options:"
    echo "  --force-migration, -f    Force re-run all migrations"
    echo "  --help, -h              Show this help message"
    echo ""
    echo "Examples:"
    echo "  $0                      # Normal startup with auto-migration detection"
    echo "  $0 --force-migration    # Force re-run all migrations"
    exit 0
fi

echo "="*60
echo "🚀 ENHANCED TECH STACK SELECTOR v15.0 - DOCKER VERSION"
echo "="*60
echo "✅ PostgreSQL data migrated to Neo4j"
echo "✅ Price-based relationships"
echo "✅ Real data from PostgreSQL"
echo "✅ Comprehensive pricing analysis"
echo "✅ Docker-optimized startup"
echo "="*60

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

# Function to print colored output
print_status() {
    echo -e "${GREEN}✅ $1${NC}"
}

print_warning() {
    echo -e "${YELLOW}⚠️ $1${NC}"
}

print_error() {
    echo -e "${RED}❌ $1${NC}"
}

print_info() {
    echo -e "${BLUE}ℹ️ $1${NC}"
}

# Get environment variables with defaults
POSTGRES_HOST=${POSTGRES_HOST:-postgres}
POSTGRES_PORT=${POSTGRES_PORT:-5432}
POSTGRES_USER=${POSTGRES_USER:-pipeline_admin}
POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-secure_pipeline_2024}
POSTGRES_DB=${POSTGRES_DB:-dev_pipeline}
NEO4J_URI=${NEO4J_URI:-bolt://neo4j:7687}
NEO4J_USER=${NEO4J_USER:-neo4j}
NEO4J_PASSWORD=${NEO4J_PASSWORD:-password}
CLAUDE_API_KEY=${CLAUDE_API_KEY:-}

print_status "Environment variables loaded"
print_info "PostgreSQL: ${POSTGRES_HOST}:${POSTGRES_PORT}/${POSTGRES_DB}"
print_info "Neo4j: ${NEO4J_URI}"

# Function to wait for service to be ready
wait_for_service() {
    local service_name=$1
    local host=$2
    local port=$3
    local max_attempts=30
    local attempt=1
    
    print_info "Waiting for ${service_name} to be ready..."
    
    while [ $attempt -le $max_attempts ]; do
        if nc -z $host $port 2>/dev/null; then
            print_status "${service_name} is ready!"
            return 0
        fi
        
        print_info "Attempt ${attempt}/${max_attempts}: ${service_name} not ready yet, waiting 2 seconds..."
        sleep 2
        attempt=$((attempt + 1))
    done
    
    print_error "${service_name} failed to become ready after ${max_attempts} attempts"
    return 1
}

# Wait for PostgreSQL
if ! wait_for_service "PostgreSQL" $POSTGRES_HOST $POSTGRES_PORT; then
    exit 1
fi

# Wait for Neo4j
if ! wait_for_service "Neo4j" neo4j 7687; then
    exit 1
fi

# Function to check if database needs migration
check_database_migration() {
    print_info "Checking if database needs migration..."
    
    # Check if price_tiers table exists and has data
    if ! python3 -c "
import psycopg2
import os
try:
    conn = psycopg2.connect(
        host=os.getenv('POSTGRES_HOST', 'postgres'),
        port=int(os.getenv('POSTGRES_PORT', '5432')),
        user=os.getenv('POSTGRES_USER', 'pipeline_admin'),
        password=os.getenv('POSTGRES_PASSWORD', 'secure_pipeline_2024'),
        database=os.getenv('POSTGRES_DB', 'dev_pipeline')
    )
    cursor = conn.cursor()
    
    # Check if price_tiers table exists
    cursor.execute(\"\"\"
        SELECT EXISTS (
            SELECT FROM information_schema.tables 
            WHERE table_schema = 'public' 
            AND table_name = 'price_tiers'
        );
    \"\"\")
    table_exists = cursor.fetchone()[0]
    
    if not table_exists:
        print('price_tiers table does not exist - migration needed')
        exit(1)
    
    # Check if price_tiers has data
    cursor.execute('SELECT COUNT(*) FROM price_tiers;')
    count = cursor.fetchone()[0]
    
    if count == 0:
        print('price_tiers table is empty - migration needed')
        exit(1)
    
    # Check if stack_recommendations has sufficient data
    cursor.execute('SELECT COUNT(*) FROM stack_recommendations;')
    rec_count = cursor.fetchone()[0]
    
    if rec_count < 20:  # Reduced threshold for Docker environment
        print(f'stack_recommendations has only {rec_count} records - migration needed')
        exit(1)
    
    print('Database appears to be fully migrated')
    cursor.close()
    conn.close()
    
except Exception as e:
    print(f'Error checking database: {e}')
    exit(1)
" 2>/dev/null; then
        return 1  # Migration needed
    else
        return 0  # Migration not needed
    fi
}

# Function to run PostgreSQL migrations
run_postgres_migrations() {
    print_info "Running PostgreSQL migrations..."
    
    # Migration files in order
    migration_files=(
        "db/001_schema.sql"
        "db/002_tools_migration.sql"
        "db/003_tools_pricing_migration.sql"
    )
    
    # Set PGPASSWORD to avoid password prompts
    export PGPASSWORD="$POSTGRES_PASSWORD"
    
    for migration_file in "${migration_files[@]}"; do
        if [ ! -f "$migration_file" ]; then
            print_error "Migration file not found: $migration_file"
            exit 1
        fi
        
        print_info "Running migration: $migration_file"
        
        # Run migration with error handling
        if psql -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER -d $POSTGRES_DB -f "$migration_file" -q 2>/dev/null; then
            print_status "Migration completed: $migration_file"
        else
            print_error "Migration failed: $migration_file"
            print_info "Check the error logs above for details"
            exit 1
        fi
    done
    
    # Unset password
    unset PGPASSWORD
    
    print_status "All PostgreSQL migrations completed successfully"
}

# Check if migration is needed and run if necessary
if [ "$FORCE_MIGRATION" = true ]; then
    print_warning "Force migration enabled - running migrations..."
    run_postgres_migrations
    
    # Verify migration was successful
    print_info "Verifying migration..."
    if check_database_migration; then
        print_status "Migration verification successful"
    else
        print_error "Migration verification failed"
        exit 1
    fi
elif check_database_migration; then
    print_status "Database is already migrated"
else
    print_warning "Database needs migration - running migrations..."
    run_postgres_migrations
    
    # Verify migration was successful
    print_info "Verifying migration..."
    if check_database_migration; then
        print_status "Migration verification successful"
    else
        print_error "Migration verification failed"
        exit 1
    fi
fi

# Check if Neo4j migration has been run
print_info "Checking if Neo4j migration has been completed..."
if ! python3 -c "
from neo4j import GraphDatabase
import os
try:
    driver = GraphDatabase.driver(
        os.getenv('NEO4J_URI', 'bolt://neo4j:7687'), 
        auth=(os.getenv('NEO4J_USER', 'neo4j'), os.getenv('NEO4J_PASSWORD', 'password'))
    )
    with driver.session() as session:
        result = session.run('MATCH (p:PriceTier) RETURN count(p) as count')
        price_tiers = result.single()['count']
        if price_tiers == 0:
            print('No data found in Neo4j - migration needed')
            exit(1)
        else:
            print(f'Found {price_tiers} price tiers - migration appears complete')
    driver.close()
except Exception as e:
    print(f'Error checking migration status: {e}')
    exit(1)
" 2>/dev/null; then
    print_warning "No data found in Neo4j - running migration..."
    
    # Run migration
    if python3 migrate_postgres_to_neo4j.py; then
        print_status "Migration completed successfully"
    else
        print_error "Migration failed"
        exit 1
    fi
else
    print_status "Migration appears to be complete"
fi

# Set environment variables for the application
export NEO4J_URI="$NEO4J_URI"
export NEO4J_USER="$NEO4J_USER"
export NEO4J_PASSWORD="$NEO4J_PASSWORD"
export POSTGRES_HOST="$POSTGRES_HOST"
export POSTGRES_PORT="$POSTGRES_PORT"
export POSTGRES_USER="$POSTGRES_USER"
export POSTGRES_PASSWORD="$POSTGRES_PASSWORD"
export POSTGRES_DB="$POSTGRES_DB"
export CLAUDE_API_KEY="$CLAUDE_API_KEY"

print_status "Environment variables set"

# Create logs directory if it doesn't exist
mkdir -p logs

# Start the migrated application
print_info "Starting Enhanced Tech Stack Selector (Docker Version)..."
print_info "Server will be available at: http://localhost:8002"
print_info "API documentation: http://localhost:8002/docs"
print_info "Health check: http://localhost:8002/health"
print_info "Diagnostics: http://localhost:8002/api/diagnostics"
print_info ""
print_info "Press Ctrl+C to stop the server"
print_info ""

# Start the application
cd src
python3 main_migrated.py