package database

import (
	"context"
	"embed"
	"fmt"
	otterError "git.anthrove.art/Anthrove/otter-space-sdk/v2/pkg/error"
	"git.anthrove.art/Anthrove/otter-space-sdk/v2/pkg/models"
	migrate "github.com/rubenv/sql-migrate"
	log "github.com/sirupsen/logrus"
	"go.opentelemetry.io/contrib/bridges/otellogrus"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/trace"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
)

const tracingName = "git.anthrove.art/Anthrove/otter-space-sdk/v2/pkg/database"

var (
	//go:embed migrations/*.sql
	embedMigrations embed.FS
	client          *gorm.DB
	tracer          trace.Tracer
	logger          *log.Logger
)

func Connect(_ context.Context, config models.DatabaseConfig) error {
	var localSSL string

	if config.SSL {
		localSSL = "require"
	} else {
		localSSL = "disable"
	}

	dsn := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%d sslmode=%s TimeZone=%s", config.Endpoint, config.Username, config.Password, config.Database, config.Port, localSSL, config.Timezone)
	sqlDB, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})

	if err != nil {
		return err
	}

	err = migrateDatabase(sqlDB, config)
	if err != nil {
		return err
	}

	setupTelemetry()

	client = sqlDB
	return nil
}

func migrateDatabase(dbPool *gorm.DB, config models.DatabaseConfig) error {
	dialect := "postgres"
	migrations := &migrate.EmbedFileSystemMigrationSource{FileSystem: embedMigrations, Root: "migrations"}

	db, err := dbPool.DB()
	if err != nil {
		return fmt.Errorf("postgres migration: %v", err)
	}

	n, err := migrate.Exec(db, dialect, migrations, migrate.Up)
	if err != nil {
		return fmt.Errorf("postgres migration: %v", err)
	}

	if config.Debug {
		if n != 0 {
			log.Infof("postgres migration: applied %d migrations!", n)

		} else {
			log.Info("postgres migration: nothing to migrate")

		}
	}

	return nil
}

func setupTelemetry() {
	tracer = otel.Tracer(tracingName)

	hook := otellogrus.NewHook(tracingName)
	logger.AddHook(hook)

}

func GetGorm(ctx context.Context) (*gorm.DB, error) {
	if client == nil {
		return nil, &otterError.Database{Reason: otterError.DatabaseIsNotConnected}
	}

	return client, nil
}