package lighthouse

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

	"git.golem15.com/golem15/summercms/modules/lagoon"
	_ "github.com/jackc/pgx/v5/stdlib"
	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/modules/postgres"
)

var (
	lhPG    *postgres.PostgresContainer
	lhSQL   *sql.DB
	lhDSN   string
	lhPGErr error
	dbSeq   atomic.Int64
)

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

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

func startLighthousePostgres(ctx context.Context) error {
	ctr, err := postgres.Run(ctx,
		"postgres:16-alpine",
		postgres.WithDatabase("lighthouse"),
		postgres.WithUsername("lighthouse"),
		postgres.WithPassword("lighthouse"),
		postgres.BasicWaitStrategies(),
	)
	if err != nil {
		return err
	}
	lhPG = 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
	}
	lhSQL = db
	lhDSN = dsn
	return nil
}

func stopLighthousePostgres() {
	if lhSQL != nil {
		_ = lhSQL.Close()
	}
	if lhPG != nil {
		_ = testcontainers.TerminateContainer(lhPG)
	}
}

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

// migratedDB returns a dedicated database migrated with
// lagoon.Migrate (River v7 and summer_jobs) plus its DSN.
func migratedDB(t *testing.T) (*sql.DB, string) {
	t.Helper()
	admin := adminDB(t)
	ctx := t.Context()
	name := fmt.Sprintf("lighthouse_%d", dbSeq.Add(1))
	if _, err := admin.ExecContext(ctx, `CREATE DATABASE `+name+` TEMPLATE template0 ENCODING 'UTF8'`); err != nil && !strings.Contains(err.Error(), "already exists") {
		t.Fatalf("create %s: %v", name, err)
	}
	dsn, err := dsnWithDB(lhDSN, 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 `+name+` WITH (FORCE)`)
	})
	gdb, err := lagoon.Use(ctx, db)
	if err != nil {
		t.Fatal(err)
	}
	if err := lagoon.Migrate(gdb, nil); 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
}