package main

import (
	"context"
	"database/sql"
	"fmt"
	"strings"
	"time"

	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
	_ "github.com/microsoft/go-mssqldb"
	log "github.com/sirupsen/logrus"
)

func main() {
	log.SetFormatter(&log.TextFormatter{
		FullTimestamp:   true,
		TimestampFormat: time.StampMilli,
	})
	log.SetLevel(log.DebugLevel)

	db, err := sql.Open("sqlserver", config.App.SourceDbUrl)
	if err != nil {
		log.Fatal("Unexpected error connecting to mssql", err)
	}

	ctx := context.Background()

	schema := "test"
	table := "migration_test"
	colNames := []string{"id", "nombre_producto", "descripcion", "stock", "precio", "es_activo", "fecha_creacion", "ultima_actualizacion", "configuracion_json", "etiquetas", "binario_test", "ip_servidor", "rango_prueba_min", "rango_prueba_max"}

	query := buildExtractSqlSentence(schema, table, colNames)

	rows, err := db.QueryContext(ctx, query)
	if err != nil {
		log.Fatal("Unexpected error extracting data", err)
	}
	defer rows.Close()

	cols, _ := rows.Columns()

	values := make([]any, len(cols))
	scanArgs := make([]any, len(cols))
	for i := range values {
		scanArgs[i] = &values[i]
	}

	count := 0
	for rows.Next() {
		if err := rows.Scan(scanArgs...); err != nil {
			log.Fatal("Error scan", err)
		}

		count++
		if count%100000 == 0 {
			log.Infof("Procesadas %d filas...\n", count)
		}

		if count < 2 {
			log.Debugf("Processed row (%d):", count)

			for i, col := range cols {
				log.Debugf("%s: %v", col, values[i])
			}
		}
	}

	log.Infof("Rows processed %d", count)
}

func buildExtractSqlSentence(schema, table string, colNames []string) string {
	var sbColumns strings.Builder

	for i, col := range colNames {
		sbColumns.WriteString(`[`)
		sbColumns.WriteString(col)
		sbColumns.WriteString(`]`)
		if i < len(colNames)-1 {
			sbColumns.WriteString(", ")
		}
	}

	return fmt.Sprintf(`SELECT %s FROM [%s].[%s] WITH (NOLOCK)`, sbColumns.String(), schema, table)
}