package main

import (
	"context"
	"log"
	"os"
	"time"

	"github.com/jackc/pgx/v5"

	"geoip-rest/internal/importer"
)

const (
	defaultCSVPath   = "./initial_data/user_program_info_init_20251208.csv"
	defaultUpdateDir = "./update_data"
	defaultTimeout   = 10 * time.Minute
	defaultSchema    = "public"
	defaultLogDir    = "./log"
	targetTableName  = "user_program_info_replica"
)

func main() {
	dbURL := os.Getenv("DATABASE_URL")
	if dbURL == "" {
		log.Fatal("DATABASE_URL is required")
	}

	csvPath := env("USER_PROGRAM_INFO_CSV", defaultCSVPath)
	updateDir := env("USER_PROGRAM_UPDATE_DIR", defaultUpdateDir)
	schema := env("USER_PROGRAM_INFO_SCHEMA", defaultSchema)
	logDir := env("USER_PROGRAM_IMPORT_LOG_DIR", defaultLogDir)

	ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout)
	defer cancel()

	conn, err := pgx.Connect(ctx, dbURL)
	if err != nil {
		log.Fatalf("failed to connect to database: %v", err)
	}
	defer conn.Close(context.Background())

	if err := importer.EnsureUserProgramReplica(ctx, conn, csvPath, schema, logDir); err != nil {
		log.Fatalf("failed to ensure %s table: %v", targetTableName, err)
	}

	if err := importer.ImportUserProgramUpdates(ctx, conn, updateDir, schema, logDir); err != nil {
		log.Fatalf("failed to import updates from %s: %v", updateDir, err)
	}

	log.Printf("%s is ready in schema %s using data from %s (updates: %s)", targetTableName, schema, csvPath, updateDir)
}

func env(key, fallback string) string {
	if val := os.Getenv(key); val != "" {
		return val
	}
	return fallback
}