package data

import (
	"context"
	"fmt"
	"strings"
	"time"

	"kra/internal/config"

	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

func mongoURI(config *config.Mongo) string {
	hosts := make([]string, 0, len(config.Hosts))
	for _, host := range config.Hosts {
		if host != nil && host.Host != "" && host.Port != "" {
			hosts = append(hosts, host.Host+":"+host.Port)
		}
	}
	uri := "mongodb://" + strings.Join(hosts, ",") + "/" + config.Database
	if config.Options != "" {
		uri += "?" + config.Options
	}
	return uri
}

func openMongo(config *config.Mongo, enabled bool) (*mongo.Client, error) {
	if !enabled {
		return nil, nil
	}
	if config == nil || len(config.Hosts) == 0 {
		return nil, fmt.Errorf("mongo hosts are required")
	}
	clientOptions := options.Client().ApplyURI(mongoURI(config))
	if config.Username != "" && config.Password != "" {
		clientOptions.SetAuth(options.Credential{Username: config.Username, Password: config.Password, AuthSource: config.AuthSource})
	}
	if config.MinPoolSize > 0 {
		clientOptions.SetMinPoolSize(config.MinPoolSize)
	}
	if config.MaxPoolSize > 0 {
		clientOptions.SetMaxPoolSize(config.MaxPoolSize)
	}
	if config.ConnectTimeoutMs > 0 {
		clientOptions.SetConnectTimeout(time.Duration(config.ConnectTimeoutMs) * time.Millisecond)
	}
	if config.SocketTimeoutMs > 0 {
		clientOptions.SetSocketTimeout(time.Duration(config.SocketTimeoutMs) * time.Millisecond)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()
	client, err := mongo.Connect(ctx, clientOptions)
	if err != nil {
		return nil, err
	}
	if err = client.Ping(ctx, nil); err != nil {
		_ = client.Disconnect(context.Background())
		return nil, err
	}
	return client, nil
}