package main

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"os"
	"strings"

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

func main() {
	dsn := strings.TrimSpace(os.Getenv("MYSQL_DSN"))
	if dsn == "" {
		panic("MYSQL_DSN is required")
	}
	db, err := sql.Open("mysql", dsn)
	if err != nil {
		panic(err)
	}
	defer db.Close()
	for _, table := range []string{
		"vehicle_data_source",
		"vehicle_daily_mileage_source",
		"vehicle_daily_mileage",
		"vehicle",
		"vehicle_identifier",
	} {
		var name, ddl string
		if err := db.QueryRow("SHOW CREATE TABLE "+table).Scan(&name, &ddl); err != nil {
			panic(err)
		}
		fmt.Printf("=== %s ===\n%s\n", name, ddl)
	}
	rows, err := db.Query("SELECT * FROM vehicle_data_source WHERE id = 661200")
	if err != nil {
		panic(err)
	}
	defer rows.Close()
	columns, err := rows.Columns()
	if err != nil {
		panic(err)
	}
	if rows.Next() {
		values := make([]any, len(columns))
		pointers := make([]any, len(columns))
		for i := range values {
			pointers[i] = &values[i]
		}
		if err := rows.Scan(pointers...); err != nil {
			panic(err)
		}
		record := make(map[string]any, len(columns))
		for i, column := range columns {
			switch value := values[i].(type) {
			case []byte:
				record[column] = string(value)
			default:
				record[column] = value
			}
		}
		data, _ := json.Marshal(record)
		fmt.Printf("=== source_661200 ===\n%s\n", data)
	}
}