package lagoon

import (
	"context"
	"database/sql"
	"fmt"
	"net/url"
	"os"
	"strings"
	"testing"
	"time"

	_ "github.com/jackc/pgx/v5/stdlib"
	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/modules/postgres"
)

var (
	lagoonPG    *postgres.PostgresContainer
	lagoonSQL   *sql.DB
	lagoonDSN   string
	lagoonPGErr error
)

func TestMain(m *testing.M) {
	code := 1
	if !testShort() {
		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
		lagoonPGErr = startLagoonPostgres(ctx)
		cancel()
		if lagoonPGErr != nil {
			fmt.Fprintf(os.Stderr, "lagoon: testcontainers postgres: %v\n", lagoonPGErr)
			stopLagoonPostgres()
			os.Exit(1)
		}
	}
	code = m.Run()
	stopLagoonPostgres()
	os.Exit(code)
}

func testShort() bool {
	for _, a := range os.Args {
		if a == "-test.short" {
			return true
		}
	}
	return false
}

func startLagoonPostgres(ctx context.Context) error {
	ctr, err := postgres.Run(ctx,
		"postgres:16-alpine",
		postgres.WithDatabase("lagoon"),
		postgres.WithUsername("lagoon"),
		postgres.WithPassword("lagoon"),
		postgres.BasicWaitStrategies(),
		testcontainers.WithEnv(map[string]string{
			"POSTGRES_INITDB_ARGS": "--locale-provider=icu --icu-locale=pl-PL --encoding=UTF8",
		}),
	)
	if err != nil {
		return err
	}
	lagoonPG = ctr
	dsn, err := ctr.ConnectionString(ctx, "sslmode=disable")
	if err != nil {
		return err
	}
	db, err := sql.Open("pgx", dsn)
	if err != nil {
		return err
	}
	if err := db.PingContext(ctx); err != nil {
		_ = db.Close()
		return err
	}
	lagoonSQL = db
	lagoonDSN = dsn
	return nil
}

func stopLagoonPostgres() {
	if lagoonSQL != nil {
		_ = lagoonSQL.Close()
	}
	if lagoonPG != nil {
		_ = testcontainers.TerminateContainer(lagoonPG)
	}
}

func lagoonDB(t *testing.T) *sql.DB {
	t.Helper()
	if testing.Short() {
		t.Skip("requires testcontainers postgres")
	}
	if lagoonPGErr != nil {
		t.Fatalf("postgres unavailable: %v", lagoonPGErr)
	}
	if lagoonSQL == nil {
		t.Fatal("postgres unavailable: container was not started")
	}
	return lagoonSQL
}

func dedicatedDB(t *testing.T, name string) (*sql.DB, string) {
	t.Helper()
	admin := lagoonDB(t)
	ctx := t.Context()
	quoted := `"` + strings.ReplaceAll(name, `"`, `""`) + `"`
	if _, err := admin.ExecContext(ctx, `CREATE DATABASE `+quoted+` TEMPLATE template0 ENCODING 'UTF8' LOCALE_PROVIDER icu ICU_LOCALE 'pl-PL'`); err != nil && !strings.Contains(err.Error(), "already exists") {
		t.Fatalf("create %s: %v", name, err)
	}
	dsn, err := dsnWithDB(lagoonDSN, name)
	if err != nil {
		t.Fatal(err)
	}
	db, err := sql.Open("pgx", dsn)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() {
		_ = db.Close()
		_, _ = admin.ExecContext(context.Background(), `DROP DATABASE IF EXISTS `+quoted+` WITH (FORCE)`)
	})
	if err := db.PingContext(ctx); err != nil {
		t.Fatal(err)
	}
	return db, dsn
}

func dsnWithDB(dsn, name string) (string, error) {
	u, err := url.Parse(dsn)
	if err != nil {
		return "", err
	}
	u.Path = "/" + name
	return u.String(), nil
}