package graph

import (
	"context"
	"fmt"
	"tailly_back_v2/internal/domain"
	"time"

	"github.com/99designs/gqlgen/graphql"
)

type postResolver struct{ *Resolver }

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

// Posts is the resolver for the posts field.
func (r *queryResolver) Posts(ctx context.Context) ([]*domain.Post, error) {
	posts, err := r.Services.Post.GetAll(ctx)
	if err != nil {
		return nil, fmt.Errorf("failed to get posts: %w", err)
	}
	return posts, nil
}

// Post returns PostResolver implementation.
func (r *Resolver) Post() PostResolver { return &postResolver{r} }

// Author is the resolver for the author field.
func (r *postResolver) Author(ctx context.Context, obj *domain.Post) (*domain.User, error) {
	if obj.AuthorID == 0 {
		return nil, fmt.Errorf("post has no author ID")
	}

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

	return author, nil
}

// Likes is the resolver for the likes field.
func (r *postResolver) Likes(ctx context.Context, obj *domain.Post) ([]*domain.Like, error) {
	likes, err := r.Services.Like.GetByPostID(ctx, obj.ID)
	if err != nil {
		return nil, fmt.Errorf("failed to get likes: %w", err)
	}
	return likes, nil
}

// LikesCount is the resolver for the likesCount field.
func (r *postResolver) LikesCount(ctx context.Context, obj *domain.Post) (int, error) {
	count, err := r.Services.Like.GetCountForPost(ctx, obj.ID)
	if err != nil {
		return 0, fmt.Errorf("failed to get likes count: %w", err)
	}
	return count, nil
}

// CommentsCount is the resolver for the commentsCount field.
func (r *postResolver) CommentsCount(ctx context.Context, obj *domain.Post) (int, error) {
	count, err := r.Services.Comment.GetCountComments(ctx, obj.ID)
	if err != nil {
		return 0, fmt.Errorf("failed to get likes count: %w", err)
	}
	return count, nil
}

// IsLiked is the resolver for the isLiked field.
func (r *postResolver) IsLiked(ctx context.Context, obj *domain.Post) (bool, error) {
	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return false, nil // Return false if user is not authenticated
	}

	liked, err := r.Services.Like.CheckIfLiked(ctx, userID, obj.ID)
	if err != nil {
		return false, fmt.Errorf("failed to check like status: %w", err)
	}
	return liked, nil
}

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

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

// LikePost is the resolver for the likePost field.
func (r *mutationResolver) LikePost(ctx context.Context, postID int) (*domain.Like, error) {
	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return nil, fmt.Errorf("unauthorized: %w", err)
	}

	like, err := r.Services.Like.LikePost(ctx, userID, postID)
	if err != nil {
		return nil, fmt.Errorf("failed to like post: %w", err)
	}
	return like, nil
}

// UnlikePost is the resolver for the unlikePost field.
func (r *mutationResolver) UnlikePost(ctx context.Context, postID int) (bool, error) {
	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return false, fmt.Errorf("unauthorized: %w", err)
	}

	err = r.Services.Like.UnlikePost(ctx, userID, postID)
	if err != nil {
		return false, fmt.Errorf("failed to unlike post: %w", err)
	}
	return true, nil
}

// CreatePost is the resolver for the createPost field.
func (r *mutationResolver) CreatePost(ctx context.Context, title string, content graphql.Upload) (*domain.Post, error) {
	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return nil, fmt.Errorf("unauthorized: %w", err)
	}

	post, err := r.Services.Post.Create(ctx, userID, title, content)
	if err != nil {
		return nil, fmt.Errorf("failed to create post: %w", err)
	}
	return post, nil
}

// DeletePost is the resolver for the deletePost field.
func (r *mutationResolver) DeletePost(ctx context.Context, id int) (bool, error) {
	userID, err := getUserIDFromContext(ctx)
	if err != nil {
		return false, fmt.Errorf("unauthorized: %w", err)
	}

	post, err := r.Services.Post.GetByID(ctx, id)
	if err != nil {
		return false, fmt.Errorf("failed to get post: %w", err)
	}

	if post.AuthorID != userID {
		return false, fmt.Errorf("you can only delete your own posts")
	}

	err = r.Services.Post.Delete(ctx, id)
	if err != nil {
		return false, fmt.Errorf("failed to delete post: %w", err)
	}
	return true, nil
}

// GetUserPosts is the resolver for the getUserPosts field.
func (r *queryResolver) GetUserPosts(ctx context.Context, userID int) ([]*domain.Post, error) {
	posts, err := r.Services.Post.GetByAuthorID(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("failed to get posts: %w", err)
	}
	return posts, nil
}
func (r *queryResolver) PostsPaginated(ctx context.Context, limit int, offset int) ([]*domain.Post, error) {
	posts, err := r.Services.Post.GetPaginated(ctx, limit, offset)
	if err != nil {
		return nil, fmt.Errorf("failed to get paginated posts: %w", err)
	}
	return posts, nil
}