package conga

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

	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/compass"
	"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"
	"gorm.io/gorm"
)

var (
	congaPG    *postgres.PostgresContainer
	congaSQL   *sql.DB
	congaDSN   string
	congaPGErr error
	dbSeq      atomic.Int64
)

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

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

func startCongaPostgres(ctx context.Context) error {
	ctr, err := postgres.Run(ctx,
		"postgres:16-alpine",
		postgres.WithDatabase("conga"),
		postgres.WithUsername("conga"),
		postgres.WithPassword("conga"),
		postgres.BasicWaitStrategies(),
		testcontainers.WithEnv(map[string]string{
			"POSTGRES_INITDB_ARGS": "--locale-provider=icu --icu-locale=pl-PL --encoding=UTF8",
		}),
	)
	if err != nil {
		return err
	}
	congaPG = 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
	}
	congaSQL = db
	congaDSN = dsn
	return nil
}

func stopCongaPostgres() {
	if congaSQL != nil {
		_ = congaSQL.Close()
	}
	if congaPG != nil {
		_ = testcontainers.TerminateContainer(congaPG)
	}
}

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

// migratedDB returns a dedicated ICU pl-PL 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("conga_%d", dbSeq.Add(1))
	if _, err := admin.ExecContext(ctx, `CREATE DATABASE `+name+` 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(congaDSN, 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
}

// testApp returns an app whose config names dsn and which has published db
// and a GORM handle on it. Extra config keys are set as overrides.
func testApp(t *testing.T, db *sql.DB, dsn string, extra map[string]any) (*backpack.App, *gorm.DB) {
	t.Helper()
	cfg, err := compass.Open(compass.Options{Dir: t.TempDir(), Env: "testing", Environ: []string{}})
	if err != nil {
		t.Fatal(err)
	}
	if err := cfg.Set("database.dsn", dsn); err != nil {
		t.Fatal(err)
	}
	for k, v := range extra {
		if err := cfg.Set(k, v); err != nil {
			t.Fatal(err)
		}
	}
	app := backpack.New(cfg)
	gdb, err := lagoon.Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	if err := lagoon.Publish(app, db, gdb); err != nil {
		t.Fatal(err)
	}
	return app, gdb
}