package lagoon

import (
	"bytes"
	"database/sql"
	"encoding/base64"
	"os"
	"path/filepath"
	"strings"
	"testing"

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

func TestUseRejectsNilSQL(t *testing.T) {
	_, err := Use(t.Context(), nil)
	if err == nil || !strings.Contains(err.Error(), "sql db is nil") {
		t.Fatalf("got %v", err)
	}
}

func TestPublishRejectsNilHandles(t *testing.T) {
	app := backpack.New(nil)
	if err := Publish(nil, nil, nil); err == nil {
		t.Fatal("want nil app error")
	}
	if err := Publish(app, nil, &gorm.DB{}); err == nil || !strings.Contains(err.Error(), "nil") {
		t.Fatalf("got %v", err)
	}
}

func TestDSNEmptyWithoutConfig(t *testing.T) {
	if DSN(nil) != "" {
		t.Fatal("nil config must yield empty DSN")
	}
}

func TestOpenFromAppMissingConfig(t *testing.T) {
	_, _, err := OpenFromApp(t.Context(), nil)
	if err == nil || !strings.Contains(err.Error(), "app config is missing") {
		t.Fatalf("got %v", err)
	}
	_, _, err = OpenFromApp(t.Context(), backpack.New(nil))
	if err == nil || !strings.Contains(err.Error(), "app config is missing") {
		t.Fatalf("got %v", err)
	}
}

func TestSharedSQLPoolUsedByGORMAndClosed(t *testing.T) {
	_, dsn := dedicatedDB(t, "lagoon_shared")
	sqlDB, gdb, err := Open(t.Context(), dsn)
	if err != nil {
		t.Fatal(err)
	}
	raw, err := gdb.DB()
	if err != nil {
		t.Fatal(err)
	}
	if raw != sqlDB {
		t.Fatal("GORM is not using the shared *sql.DB")
	}

	app := backpack.New(nil)
	if err := Publish(app, sqlDB, gdb); err != nil {
		t.Fatal(err)
	}
	gotSQL, ok := app.Lookup[*sql.DB]()
	if !ok || gotSQL != sqlDB {
		t.Fatal("published *sql.DB is not the shared pool")
	}
	gotGORM, ok := app.Lookup[*gorm.DB]()
	if !ok || gotGORM != gdb {
		t.Fatal("published *gorm.DB is missing")
	}

	viaUse, err := Use(t.Context(), sqlDB)
	if err != nil {
		t.Fatal(err)
	}
	useRaw, err := viaUse.DB()
	if err != nil {
		t.Fatal(err)
	}
	if useRaw != sqlDB {
		t.Fatal("Use must open GORM on the caller pool, not a second connection")
	}

	if err := sqlDB.Close(); err != nil {
		t.Fatal(err)
	}
	if err := sqlDB.PingContext(t.Context()); err == nil {
		t.Fatal("closed pool must reject Ping")
	}
	if _, err := Use(t.Context(), sqlDB); err == nil {
		t.Fatal("Use must fail after the shared pool is closed")
	}
}

func TestOpenFromAppReadsDSN(t *testing.T) {
	_, dsn := dedicatedDB(t, "lagoon_from_app")
	dir := t.TempDir()
	if err := os.WriteFile(filepath.Join(dir, "app.yaml"), []byte("name: lagoon-test\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := compass.Open(compass.Options{
		Dir: dir,
		Environ: []string{
			"SUMMER_ENV=development",
			"SUMMER_DATABASE__DSN=" + dsn,
			"SUMMER_APP__KEY=" + base64.StdEncoding.EncodeToString(bytes.Repeat([]byte("T"), 32)),
		},
	})
	if err != nil {
		t.Fatal(err)
	}
	if got := DSN(cfg); got != dsn {
		t.Fatalf("DSN = %q want %q", got, dsn)
	}
	sqlDB, gdb, err := OpenFromApp(t.Context(), backpack.New(cfg))
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = sqlDB.Close() })
	raw, err := gdb.DB()
	if err != nil {
		t.Fatal(err)
	}
	if raw != sqlDB {
		t.Fatal("OpenFromApp must share the same *sql.DB with GORM")
	}
}