#!/bin/bash

# Helper script to manually clean all service databases in Kubernetes
# This ensures databases are in a clean state before running migration generation

set -euo pipefail

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

# Configuration
NAMESPACE="${KUBE_NAMESPACE:-bakery-ia}"

# Parse command line arguments
CONFIRM=false
SPECIFIC_SERVICE=""

while [[ $# -gt 0 ]]; do
    case $1 in
        --namespace) NAMESPACE="$2"; shift 2 ;;
        --service) SPECIFIC_SERVICE="$2"; shift 2 ;;
        --yes) CONFIRM=true; shift ;;
        -h|--help)
            echo "Usage: $0 [OPTIONS]"
            echo ""
            echo "Options:"
            echo "  --namespace NAME  Use specific Kubernetes namespace (default: bakery-ia)"
            echo "  --service NAME    Clean only specific service database"
            echo "  --yes             Skip confirmation prompt"
            echo ""
            echo "Examples:"
            echo "  $0                          # Clean all databases (with confirmation)"
            echo "  $0 --service auth --yes     # Clean only auth database without confirmation"
            exit 0
            ;;
        *) echo "Unknown option: $1"; echo "Use --help for usage information"; exit 1 ;;
    esac
done

# List of all services
SERVICES=(
    "pos" "sales" "recipes" "training" "auth" "orders" "inventory"
    "suppliers" "tenant" "notification" "alert-processor" "forecasting"
    "external" "production"
)

# If specific service is provided, use only that
if [ -n "$SPECIFIC_SERVICE" ]; then
    SERVICES=("$SPECIFIC_SERVICE")
fi

echo -e "${BLUE}========================================${NC}"
echo -e "${BLUE}Database Cleanup Script (K8s)${NC}"
echo -e "${BLUE}========================================${NC}"
echo ""
echo -e "${RED}⚠  WARNING: This will DROP ALL TABLES in the following databases:${NC}"
for service in "${SERVICES[@]}"; do
    echo -e "  - ${service}"
done
echo ""

if [ "$CONFIRM" = false ]; then
    read -p "Are you sure you want to continue? (yes/no) " -r
    echo
    if [[ ! $REPLY =~ ^yes$ ]]; then
        echo -e "${YELLOW}Aborted.${NC}"
        exit 0
    fi
fi

SUCCESS_COUNT=0
FAILED_COUNT=0
FAILED_SERVICES=()

# Function to get a running pod for a service
get_running_pod() {
    local service=$1
    local pod_name=""
    local selectors=(
        "app.kubernetes.io/name=${service}-service,app.kubernetes.io/component=microservice"
        "app.kubernetes.io/name=${service}-service,app.kubernetes.io/component=worker"
        "app.kubernetes.io/name=${service}-service"
    )

    for selector in "${selectors[@]}"; do
        pod_name=$(kubectl get pods -n "$NAMESPACE" -l "$selector" --field-selector=status.phase=Running -o jsonpath='{.items[0].metadata.name}' 2>/dev/null)
        if [ -n "$pod_name" ]; then
            echo "$pod_name"
            return 0
        fi
    done

    echo ""
    return 1
}

echo ""
echo -e "${BLUE}Starting database cleanup...${NC}"
echo ""

for service in "${SERVICES[@]}"; do
    echo -e "${BLUE}----------------------------------------${NC}"
    echo -e "${BLUE}Cleaning: $service${NC}"
    echo -e "${BLUE}----------------------------------------${NC}"

    # Find pod
    POD_NAME=$(get_running_pod "$service")
    if [ -z "$POD_NAME" ]; then
        echo -e "${RED}✗ No running pod found, skipping...${NC}"
        FAILED_COUNT=$((FAILED_COUNT + 1))
        FAILED_SERVICES+=("$service (pod not found)")
        continue
    fi

    echo -e "${GREEN}✓ Found pod: $POD_NAME${NC}"

    # Get database URL environment variable name
    db_env_var=$(echo "$service" | tr '[:lower:]-' '[:upper:]_')_DATABASE_URL
    CONTAINER="${service}-service"

    # Drop all tables
    CLEANUP_RESULT=$(kubectl exec -n "$NAMESPACE" "$POD_NAME" -c "$CONTAINER" -- sh -c "cd /app && PYTHONPATH=/app:/app/shared:\$PYTHONPATH python3 << 'EOFPYTHON'
import asyncio
import os
from sqlalchemy.ext.asyncio import create_async_engine
from sqlalchemy import text

async def cleanup_database():
    try:
        engine = create_async_engine(os.getenv('$db_env_var'))

        # Get list of tables before cleanup
        async with engine.connect() as conn:
            result = await conn.execute(text(\"\"\"
                SELECT COUNT(*)
                FROM pg_tables
                WHERE schemaname = 'public'
            \"\"\"))
            table_count_before = result.scalar()

        # Drop and recreate public schema
        async with engine.begin() as conn:
            await conn.execute(text('DROP SCHEMA IF EXISTS public CASCADE'))
            await conn.execute(text('CREATE SCHEMA public'))
            await conn.execute(text('GRANT ALL ON SCHEMA public TO PUBLIC'))

        # Verify cleanup
        async with engine.connect() as conn:
            result = await conn.execute(text(\"\"\"
                SELECT COUNT(*)
                FROM pg_tables
                WHERE schemaname = 'public'
            \"\"\"))
            table_count_after = result.scalar()

        await engine.dispose()
        print(f'SUCCESS: Dropped {table_count_before} tables, {table_count_after} remaining')
        return 0
    except Exception as e:
        print(f'ERROR: {str(e)}')
        return 1

exit(asyncio.run(cleanup_database()))
EOFPYTHON
" 2>&1)

    if echo "$CLEANUP_RESULT" | grep -q "SUCCESS"; then
        echo -e "${GREEN}✓ Database cleaned successfully${NC}"
        echo -e "${BLUE}  $CLEANUP_RESULT${NC}"
        SUCCESS_COUNT=$((SUCCESS_COUNT + 1))
    else
        echo -e "${RED}✗ Database cleanup failed${NC}"
        echo -e "${YELLOW}Error details: $CLEANUP_RESULT${NC}"
        FAILED_COUNT=$((FAILED_COUNT + 1))
        FAILED_SERVICES+=("$service (cleanup failed)")
    fi
    echo ""
done

# Summary
echo -e "${BLUE}========================================${NC}"
echo -e "${BLUE}Summary${NC}"
echo -e "${BLUE}========================================${NC}"
echo -e "${GREEN}✓ Successfully cleaned: $SUCCESS_COUNT databases${NC}"
echo -e "${RED}✗ Failed: $FAILED_COUNT databases${NC}"

if [ "$FAILED_COUNT" -gt 0 ]; then
    echo ""
    echo -e "${RED}Failed services:${NC}"
    for failed_service in "${FAILED_SERVICES[@]}"; do
        echo -e "${RED}  - $failed_service${NC}"
    done
fi

echo ""
if [ "$SUCCESS_COUNT" -gt 0 ]; then
    echo -e "${GREEN}Databases are now clean and ready for migration generation!${NC}"
    echo -e "${YELLOW}Next step: Run ./regenerate_migrations_k8s.sh${NC}"
fi