package dbAccess

import (
	"git.fjla.uk/owlboard/timetable-mgr/helpers"
	"git.fjla.uk/owlboard/timetable-mgr/log"

	"context"
	"fmt"
	"time"

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

// Provide the DB Connection to other functions
var MongoClient (*mongo.Client)

// Builds the DB URI based on the loaded configuration parameters
func getDbUri(cfg *helpers.Configuration) string {
	var uri = "mongodb://" + cfg.DbUser + ":" + cfg.DbPass + "@" + cfg.DbHost + ":" + cfg.DbPort
	return uri
}

// Configure bsonOpts
var bsonOpts = &options.BSONOptions{
	UseJSONStructTags: true,
}

// Initialise the DB Connection
func InitDataAccess(cfg *helpers.Configuration) {
	uri := getDbUri(cfg)
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	client, err := mongo.Connect(ctx, options.Client().ApplyURI(uri).SetBSONOptions(bsonOpts))
	if err != nil {
		fmt.Println(err)
		log.Msg.Fatal("Error connecting to database: " + err.Error())
	} else {
		log.Msg.Info("Database connection successful")
	}
	MongoClient = client
}

// Closes the connection to the database - used for cleanup functions
func CloseMongoClient() {
	if MongoClient != nil {
		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer cancel()
		if err := MongoClient.Disconnect(ctx); err != nil {
			log.Msg.Warn("Error disconnecting MongoDB client: " + err.Error())
		} else {
			log.Msg.Info("MongoDB client disconnected.")
		}
	}
}