package main

import (
	"database/sql"
	"fmt"
	"log"
	"os"

	_ "github.com/go-sql-driver/mysql"
)

func main() {
	// Database connection parameters
	host := os.Getenv("DB_HOST")
	if host == "" {
		host = "localhost"
	}
	user := os.Getenv("DB_USER")
	if user == "" {
		user = "root"
	}
	password := os.Getenv("DB_PASSWORD")
	if password == "" {
		password = ""
	}
	dbName := os.Getenv("DB_NAME")
	if dbName == "" {
		dbName = "crm_db"
	}
	port := os.Getenv("DB_PORT")
	if port == "" {
		port = "3306"
	}

	dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
		user, password, host, port, dbName)

	db, err := sql.Open("mysql", dsn)
	if err != nil {
		log.Fatal("Failed to connect to database:", err)
	}
	defer db.Close()

	// Check if column exists
	var columnExists int
	err = db.QueryRow(`
		SELECT COUNT(*) 
		FROM INFORMATION_SCHEMA.COLUMNS 
		WHERE TABLE_SCHEMA = ? 
		AND TABLE_NAME = 'trial_periods' 
		AND COLUMN_NAME = 'intended_product'
	`, dbName).Scan(&columnExists)

	if err != nil {
		log.Fatal("Failed to check column existence:", err)
	}

	if columnExists > 0 {
		log.Println("✅ Column 'intended_product' already exists in trial_periods table")
		return
	}

	// Add the intended_product column
	_, err = db.Exec(`
		ALTER TABLE trial_periods 
		ADD COLUMN intended_product VARCHAR(255) DEFAULT '' AFTER source
	`)

	if err != nil {
		log.Fatal("Failed to add intended_product column:", err)
	}

	log.Println("✅ Successfully added 'intended_product' column to trial_periods table")
}