package db

import (
	"context"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"log"
	"time"
	"valera/config"
)

const (
	UserStateNone = UserState("")
	UserStateGo   = UserState("Go")
)

type UserState string

type chatDTO struct {
	ChatID int64 `bson:"chat_id"`
}

type ChatInfoDTO struct {
	ChatID int64  `bson:"chat_id"`
	Status string `bson:"status"`
}

func (c *ChatInfoDTO) GetStatus() UserState {
	if c.Status == "" {
		return UserStateNone
	}
	return UserStateGo
}

type Workout struct {
	ChatID    int64     `bson:"chat_id"`
	Name      string    `bson:"name"`
	Count     int       `bson:"count"`
	CreatedAt time.Time `bson:"created_at"`
	Username  string    `bson:"username"`
}

func NewWorkout(
	name string,
	count int,
	username string,
) *Workout {
	return &Workout{
		Name:     name,
		Count:    count,
		Username: username,
	}
}

var cfg *config.Config

func init() {
	cfg = config.NewConfig()
}

func AddChat(chatID int64) error {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)

	result := collection.FindOne(ctx, bson.M{"chat_id": chatID})
	if result.Err() == mongo.ErrNoDocuments {
		if _, err := collection.InsertOne(ctx, &chatDTO{ChatID: chatID}); err != nil {
			return err
		}
		return nil
	}
	return result.Err()
}

func AddWorkout(chatID int64, workout *Workout) error {
	if workout.Count <= 0 {
		return nil
	}
	if err := AddChat(chatID); err != nil {
		return err
	}
	workout.ChatID = chatID
	loc, _ := time.LoadLocation("Asia/Novosibirsk")
	workout.CreatedAt = time.Now().In(loc)

	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.WorkoutsCollectionName)
	_, err = collection.InsertOne(
		ctx,
		workout,
	)
	return err
}

func GetChatInfo(chatID int64) (*ChatInfoDTO, error) {
	if err := AddChat(chatID); err != nil {
		return nil, err
	}
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return nil, err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)
	chatInfoDTO := &ChatInfoDTO{}
	if err := collection.FindOne(ctx, bson.M{"chat_id": chatID}).Decode(chatInfoDTO); err != nil {
		return nil, err
	}
	return chatInfoDTO, err
}

func SetStatusToChat(chatID int64, status UserState) error {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)
	_, err = collection.UpdateOne(
		ctx,
		bson.M{"chat_id": chatID},
		bson.M{"$set": bson.M{"status": status}},
	)
	return err
}

func GetStat(chatID int64) (map[string]int, error) {
	if err := AddChat(chatID); err != nil {
		return nil, err
	}
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return nil, err
	}

	loc, _ := time.LoadLocation("Asia/Novosibirsk")
	t := time.Now().In(loc).Add(-24 * time.Hour)

	collection := client.Database(cfg.DBName).Collection(cfg.WorkoutsCollectionName)
	cursor, err := collection.Find(
		ctx,
		bson.M{
			"chat_id":    chatID,
			"created_at": bson.M{"$gt": t},
		},
	)
	if err != nil {
		return nil, err
	}
	res := map[string]int{}
	for cursor.Next(context.Background()) {
		var result Workout
		if err := cursor.Decode(&result); err != nil {
			log.Fatal(err)
		}
		res[result.Name] += result.Count
	}
	if err := cursor.Err(); err != nil {
		log.Fatal(err)
	}
	return res, err
}

func GetAllChats() ([]int64, error) {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return nil, err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)
	cursor, err := collection.Find(ctx,bson.M{})
	if err != nil {
		return nil, err
	}
	var res []int64
	for cursor.Next(context.Background()) {
		var result ChatInfoDTO
		if err := cursor.Decode(&result); err != nil {
			log.Fatal(err)
		}
		res = append(res, result.ChatID)
	}
	if err := cursor.Err(); err != nil {
		log.Fatal(err)
	}
	return res, err
}