package schemar_test

import (
	"context"
	"testing"

	"github.com/featurebasedb/featurebase/v3/dax"
	cschemar "github.com/featurebasedb/featurebase/v3/dax/controller/schemar"
	"github.com/featurebasedb/featurebase/v3/dax/controller/sqldb"
	"github.com/featurebasedb/featurebase/v3/errors"
	"github.com/featurebasedb/featurebase/v3/logger"
	"github.com/stretchr/testify/require"
)

const (
	orgID   = "orgid"
	orgID2  = "orgid2"
	dbID    = "blah"
	dbID2   = "blah2"
	dbID3   = "blah3"
	dbID4   = "blah4"
	dbName  = "haha"
	dbName2 = "haha2"
	tblName = "tbl"
)

var (
	qdbid = dax.QualifiedDatabaseID{OrganizationID: orgID, DatabaseID: dbID}
)

// TODO these tests can be generalized to share setup (getting
// transactor/tx), and then run the same tests against multiple
// underlying implementations

func TestSQLSchemar(t *testing.T) {
	conf := sqldb.GetTestConfigRandomDB("sql_schemar")
	trans, err := sqldb.NewTransactor(conf, logger.StderrLogger)
	require.NoError(t, err, "connecting")
	defer sqldb.DropDatabase(trans)

	require.NoError(t, trans.Start())

	tx, err := trans.BeginTx(context.Background(), true)
	require.NoError(t, err, "getting transaction")

	schemar := sqldb.NewSchemar(nil)

	err = schemar.CreateDatabase(tx,
		&dax.QualifiedDatabase{
			OrganizationID: orgID,
			Database:       dax.Database{ID: dbID, Name: dbName}})
	require.NoError(t, err)

	// create 2nd db in same org
	err = schemar.CreateDatabase(tx,
		&dax.QualifiedDatabase{
			OrganizationID: orgID,
			Database:       dax.Database{ID: dbID2, Name: dbName2}})
	require.NoError(t, err)

	// create 3rd db in new org
	schemar.CreateDatabase(tx,
		&dax.QualifiedDatabase{
			OrganizationID: orgID2,
			Database:       dax.Database{ID: dbID3, Name: dbName2}})
	require.NoError(t, err)

	err = schemar.CreateDatabase(tx,
		&dax.QualifiedDatabase{OrganizationID: orgID,
			Database: dax.Database{
				ID:   dbID,
				Name: dbName},
		})
	if !errors.Is(err, dax.ErrDatabaseIDExists) {
		t.Fatalf("got unexpected error creating DB that already exists: %v", err)
	}

	// make sure querying with empty org ID brings back all databases
	dbs, err := schemar.Databases(tx, "")
	require.NoError(t, err)
	require.Equal(t, 3, len(dbs))

	db, err := schemar.DatabaseByName(tx, orgID, dbName)
	require.NoError(t, err)
	require.EqualValues(t, dbID, db.ID)

	err = schemar.SetDatabaseOption(tx, qdbid, dax.DatabaseOptionWorkersMax, "4")
	require.NoError(t, err)

	err = schemar.SetDatabaseOption(tx, qdbid, dax.DatabaseOptionWorkersMin, "2")
	require.NoError(t, err)

	db, err = schemar.DatabaseByID(tx, qdbid)
	require.NoError(t, err)
	require.EqualValues(t, dbName, db.Name)
	require.EqualValues(t, 4, db.Options.WorkersMax)
	require.EqualValues(t, 2, db.Options.WorkersMin)

	dbs, err = schemar.Databases(tx, orgID)
	require.NoError(t, err)
	require.Equal(t, 2, len(dbs))
	require.EqualValues(t, orgID, dbs[0].OrganizationID)
	require.EqualValues(t, orgID, dbs[1].OrganizationID)

	dbs, err = schemar.Databases(tx, orgID, dbID)
	require.NoError(t, err)
	require.Equal(t, 1, len(dbs))
	require.EqualValues(t, orgID, dbs[0].OrganizationID)
	require.EqualValues(t, dbID, dbs[0].Database.ID)

	// test create table
	qtbl := &dax.QualifiedTable{
		QualifiedDatabaseID: qdbid,
		Table: dax.Table{
			Name: tblName,
			Fields: []*dax.Field{{
				Name:    "_id",
				Type:    "string",
				Options: dax.FieldOptions{},
			}},
			PartitionN:  4,
			Description: "desc",
			Owner:       "own",
			UpdatedBy:   "me",
		},
	}

	_, err = qtbl.CreateID()
	require.NoError(t, err)
	err = schemar.CreateTable(tx, qtbl)
	require.NoError(t, err)

	// test create field
	err = schemar.CreateField(tx, qtbl.QualifiedID(), &dax.Field{Name: "age", Type: "int"})
	require.NoError(t, err)

	qtbl, err = schemar.Table(tx, qtbl.QualifiedID())
	require.NoError(t, err)

	require.Equal(t, 2, len(qtbl.Fields))

	var ageField *dax.Field

	for _, f := range qtbl.Fields {
		if f.Name == "age" {
			ageField = f
		}
	}

	require.NotNil(t, ageField)

	// drop field
	err = schemar.DropField(tx, qtbl.QualifiedID(), "age")
	require.NoError(t, err)

	// ensure field was dropped
	qtbl, err = schemar.Table(tx, qtbl.QualifiedID())
	require.NoError(t, err)
	require.Equal(t, 1, len(qtbl.Fields))

	if qtbl.Fields[0].Name != "_id" {
		t.Fatalf("unexpected field: %+v", qtbl.Fields[0])
	}

	tables, err := schemar.Tables(tx, qdbid)
	require.NoError(t, err)
	require.Equal(t, 1, len(tables))

	// TODO add test for Tables passing table ids
	tables, err = schemar.Tables(tx, qdbid, tables[0].ID)
	require.NoError(t, err)
	require.Equal(t, 1, len(tables))

	_, err = schemar.TableID(tx, qdbid, tblName)
	require.NoError(t, err)

	err = schemar.DropTable(tx, qtbl.QualifiedID())
	require.NoError(t, err)

	// make sure Table was deleted
	_, err = schemar.Table(tx, qtbl.QualifiedID())
	require.NotNil(t, err)

	err = schemar.DropDatabase(tx, qdbid)
	require.NoError(t, err)

	// make sure DB was deleted
	dbs, err = schemar.Databases(tx, orgID)
	require.NoError(t, err)
	require.Equal(t, 1, len(dbs))
	require.EqualValues(t, dbID2, dbs[0].Database.ID)

	// rollback so we have clean state to test failure cases
	err = tx.Rollback()
	if err != nil {
		require.NoError(t, err, "rolling back to test failure cases")
	}

	qtbl = &dax.QualifiedTable{
		QualifiedDatabaseID: qdbid,
		Table: dax.Table{
			Name: tblName,
			Fields: []*dax.Field{
				{
					Name:    "_id",
					Type:    "string",
					Options: dax.FieldOptions{},
				},
				{
					Name:    "age",
					Type:    "int",
					Options: dax.FieldOptions{},
				},
			},
			PartitionN:  4,
			Description: "desc",
			Owner:       "own",
			UpdatedBy:   "me",
		},
	}
	qtbl.ID = ""
	_, err = qtbl.CreateID()
	require.NoError(t, err)

	t.Run("Create Table no DB fails", func(t *testing.T) {
		tx2, err := trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx2.Rollback()
		err = schemar.CreateTable(tx2, qtbl)
		require.NotNil(t, err)
	})

	tx, err = trans.BeginTx(context.Background(), true)
	require.NoError(t, err, "beginning transaction")

	err = schemar.CreateDatabase(tx,
		&dax.QualifiedDatabase{
			OrganizationID: orgID,
			Database:       dax.Database{ID: dbID, Name: dbName}})
	require.NoError(t, err)

	err = schemar.CreateTable(tx, qtbl)
	require.NoError(t, err)

	err = tx.Commit()
	require.NoError(t, err)

	t.Run("Drop non-existent field fails with correct error", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		err = schemar.DropField(tx, qtbl.QualifiedID(), "unknownField")
		requireCode(t, err, dax.ErrFieldDoesNotExist)
	})

	t.Run("Drop field from non-existent table", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		err = schemar.DropField(tx, dax.QualifiedTableID{QualifiedDatabaseID: qdbid, ID: "blah", Name: "blah"}, "age")
		requireCode(t, err, dax.ErrFieldDoesNotExist)
	})

	t.Run("Test Lookup non-existent table fails with correct error (by name)", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		_, err = schemar.Table(tx, dax.QualifiedTableID{QualifiedDatabaseID: qdbid, Name: "humbug"})
		requireCode(t, err, dax.ErrTableNameDoesNotExist)
	})

	t.Run("Test Lookup non-existent table fails with correct error (by name)", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		_, err = schemar.Table(tx, dax.QualifiedTableID{QualifiedDatabaseID: qdbid, ID: "bumhug", Name: "humbug"})
		requireCode(t, err, dax.ErrTableIDDoesNotExist)
	})

	t.Run("Test Lookup non-existent tableID fails with correct error (by name)", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		_, err = schemar.TableID(tx, qdbid, "humbug")
		requireCode(t, err, dax.ErrTableNameDoesNotExist)
	})

	t.Run("Test Create existing field fails", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		err = schemar.CreateField(tx, qtbl.QualifiedID(), &dax.Field{Name: "age", Type: "int", Options: dax.FieldOptions{}})
		requireCode(t, err, dax.ErrFieldExists)
	})

	t.Run("Test Create field empty name fails", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		err = schemar.CreateField(tx, qtbl.QualifiedID(), &dax.Field{Name: "", Type: "int", Options: dax.FieldOptions{}})
		requireCode(t, err, cschemar.ErrCodeFieldNameInvalid)
	})

	t.Run("Test create table where table name already exists", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		err = schemar.CreateTable(tx, qtbl)
		requireCode(t, err, dax.ErrTableNameExists)
	})

	t.Run("Find database by name that doesn't exist", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		_, err = schemar.DatabaseByName(tx, orgID, "blooooooo")
		requireCode(t, err, dax.ErrDatabaseNameDoesNotExist)
	})

	t.Run("Create database with database name that already exists", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		err = schemar.CreateDatabase(tx,
			&dax.QualifiedDatabase{
				OrganizationID: orgID,
				Database:       dax.Database{ID: dbID2, Name: dbName}})
		requireCode(t, err, dax.ErrDatabaseNameExists)
	})

	t.Run("Find database by ID that doesn't exist", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		_, err = schemar.DatabaseByID(tx, dax.QualifiedDatabaseID{OrganizationID: orgID, DatabaseID: "zeeeeeeeeeeeeep"})
		requireCode(t, err, dax.ErrDatabaseIDDoesNotExist)
	})

	t.Run("Drop non-existent database", func(t *testing.T) {
		tx, err = trans.BeginTx(context.Background(), true)
		require.NoError(t, err)
		defer tx.Rollback()
		err = schemar.DropDatabase(tx, dax.QualifiedDatabaseID{OrganizationID: orgID, DatabaseID: "yoooo"})
		requireCode(t, err, dax.ErrDatabaseIDDoesNotExist)
	})
}

func requireCode(t *testing.T, err error, code errors.Code) {
	t.Helper()
	if !errors.Is(err, code) {
		t.Fatalf("Error '%v' does not have code %s.", err, code)
	}
}