// user_resolvers.go
package graph

import (
	"context"
	"fmt"
	"tailly_back_v2/internal/domain"
	"tailly_back_v2/internal/service"
	"tailly_back_v2/proto"
	"time"
)

type userResolver struct{ *Resolver }

// User is the resolver for the user field.
func (r *queryResolver) User(ctx context.Context, id int) (*domain.User, error) {
	user, err := r.Services.User.GetByID(ctx, id)
	if err != nil {
		return nil, fmt.Errorf("failed to get user: %w", err)
	}
	return user, nil
}

// Me is the resolver for the me field.
func (r *queryResolver) Me(ctx context.Context) (*domain.User, error) {

	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return nil, err
	}

	user, err := r.Services.User.GetByID(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("failed to get current user: %w", err)
	}

	return user, nil
}

// User returns UserResolver implementation.
func (r *Resolver) User() UserResolver { return &userResolver{r} }

// EmailConfirmedAt is the resolver for the emailConfirmedAt field.
func (r *userResolver) EmailConfirmedAt(ctx context.Context, obj *domain.User) (*string, error) {
	if obj.EmailConfirmedAt == nil {
		return nil, nil
	}
	formatted := obj.EmailConfirmedAt.Format(time.RFC3339)
	return &formatted, nil
}

// CreatedAt is the resolver for the createdAt field.
func (r *userResolver) CreatedAt(ctx context.Context, obj *domain.User) (string, error) {
	return obj.CreatedAt.Format(time.RFC3339), nil
}

// UpdatedAt is the resolver for the updatedAt field.
func (r *userResolver) UpdatedAt(ctx context.Context, obj *domain.User) (string, error) {
	return obj.UpdatedAt.Format(time.RFC3339), nil
}

// UpdateProfile is the resolver for the updateProfile field.
func (r *mutationResolver) UpdateProfile(ctx context.Context, username string, email string, avatar string) (*domain.User, error) {
	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return nil, err
	}

	user, err := r.Services.User.UpdateProfile(ctx, userID, username, email, avatar)
	if err != nil {
		return nil, fmt.Errorf("failed to update profile: %w", err)
	}
	return user, nil
}

// ChangePassword is the resolver for the changePassword field.
func (r *mutationResolver) ChangePassword(ctx context.Context, oldPassword string, newPassword string) (bool, error) {
	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return false, err
	}

	if err := r.Services.User.ChangePassword(ctx, userID, oldPassword, newPassword); err != nil {
		return false, fmt.Errorf("failed to change password: %w", err)
	}
	return true, nil
}

// Register is the resolver for the register field.
func (r *mutationResolver) Register(ctx context.Context, input domain.RegisterInput) (*domain.User, error) {
	user, err := r.Services.Auth.Register(ctx, service.RegisterInput{
		Username: input.Username,
		Email:    input.Email,
		Password: input.Password,
	})
	if err != nil {
		return nil, fmt.Errorf("failed to register: %w", err)
	}
	return user, nil
}

// Login is the resolver for the login field.
func (r *mutationResolver) Login(ctx context.Context, input domain.LoginInput) (*domain.Tokens, error) {

	tokens, err := r.Services.Auth.Login(ctx, input.Email, input.Password)
	if err != nil {
		return nil, fmt.Errorf("failed to login: %w", err)
	}
	return tokens, nil
}

// Users is the resolver for the users field.
func (r *queryResolver) Users(ctx context.Context) ([]*domain.User, error) {
	userID, err := getUserIDFromContext(ctx)

	users, err := r.Services.User.GetAll(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("failed to get users: %w", err)
	}
	return users, nil
}

// FollowersCount is the resolver for the followersCount field.
func (r *userResolver) FollowersCount(ctx context.Context, obj *domain.User) (int, error) {
	res, err := r.SubscribeClient.GetFollowersCount(ctx, &proto.GetCountRequest{
		UserId: int32(obj.ID),
	})
	if err != nil {
		return 0, fmt.Errorf("failed to get followers count: %w", err)
	}
	return int(res.Count), nil
}

// FollowingCount is the resolver for the followingCount field.
func (r *userResolver) FollowingCount(ctx context.Context, obj *domain.User) (int, error) {
	res, err := r.SubscribeClient.GetFollowingCount(ctx, &proto.GetCountRequest{
		UserId: int32(obj.ID),
	})
	if err != nil {
		return 0, fmt.Errorf("failed to get following count: %w", err)
	}
	return int(res.Count), nil
}

// IsFollowing is the resolver for the isFollowing field.
func (r *userResolver) IsFollowing(ctx context.Context, obj *domain.User, userID int) (bool, error) {
	currentUserID, err := getUserIDFromContext(ctx)
	if err != nil {
		return false, fmt.Errorf("authentication required: %w", err)
	}

	res, err := r.SubscribeClient.IsFollowing(ctx, &proto.IsFollowingRequest{
		FollowerId:  int32(currentUserID),
		FollowingId: int32(userID),
	})
	if err != nil {
		return false, fmt.Errorf("failed to check subscription status: %w", err)
	}
	return res.IsFollowing, nil
}

// Followers is the resolver for the followers field.
func (r *userResolver) Followers(ctx context.Context, obj *domain.User, limit *int, offset *int) (*FollowersResponse, error) {
	limitVal := 20
	if limit != nil {
		limitVal = *limit
	}

	offsetVal := 0
	if offset != nil {
		offsetVal = *offset
	}

	res, err := r.SubscribeClient.GetFollowers(ctx, &proto.GetFollowersRequest{
		UserId: int32(obj.ID),
		Limit:  int32(limitVal),
		Offset: int32(offsetVal),
	})
	if err != nil {
		return nil, fmt.Errorf("failed to get followers: %w", err)
	}

	return &FollowersResponse{
		Followers:  convertProtoFollowersToGraphQL(res.Followers),
		TotalCount: int(res.TotalCount),
	}, nil
}

// Following is the resolver for the following field.
func (r *userResolver) Following(ctx context.Context, obj *domain.User, limit *int, offset *int) (*FollowingResponse, error) {
	limitVal := 20
	if limit != nil {
		limitVal = *limit
	}

	offsetVal := 0
	if offset != nil {
		offsetVal = *offset
	}

	res, err := r.SubscribeClient.GetFollowing(ctx, &proto.GetFollowingRequest{
		UserId: int32(obj.ID),
		Limit:  int32(limitVal),
		Offset: int32(offsetVal),
	})
	if err != nil {
		return nil, fmt.Errorf("failed to get following: %w", err)
	}

	return &FollowingResponse{
		Following:  convertProtoFollowingToGraphQL(res.Following),
		TotalCount: int(res.TotalCount),
	}, nil
}

// SubscriptionNotifications is the resolver for the subscriptionNotifications field.
func (r *userResolver) SubscriptionNotifications(ctx context.Context, obj *domain.User, unreadOnly *bool, limit *int, offset *int) (*NotificationsResponse, error) {
	currentUserID, err := getUserIDFromContext(ctx)
	if err != nil {
		return nil, fmt.Errorf("authentication required: %w", err)
	}

	// Можно смотреть только свои уведомления
	if obj.ID != currentUserID {
		return nil, fmt.Errorf("access denied: can only view your own notifications")
	}

	unreadOnlyVal := false
	if unreadOnly != nil {
		unreadOnlyVal = *unreadOnly
	}

	limitVal := 20
	if limit != nil {
		limitVal = *limit
	}

	offsetVal := 0
	if offset != nil {
		offsetVal = *offset
	}

	res, err := r.SubscribeClient.GetSubscriptionNotifications(ctx, &proto.GetNotificationsRequest{
		UserId:     int32(obj.ID),
		UnreadOnly: unreadOnlyVal,
		Limit:      int32(limitVal),
		Offset:     int32(offsetVal),
	})
	if err != nil {
		return nil, fmt.Errorf("failed to get notifications: %w", err)
	}

	return &NotificationsResponse{
		Notifications: convertProtoNotificationsToGraphQL(res.Notifications),
		TotalCount:    int(res.TotalCount),
		UnreadCount:   int(res.UnreadCount),
	}, nil
}