package builder

import (
	"context"
	"git.dragse.it/anthrove/e621-sdk-go/pkg/e621/endpoints"
	"git.dragse.it/anthrove/e621-sdk-go/pkg/e621/model"
	"strconv"
)

// PostBuilder represents a builder for constructing queries to retrieve a specific post.
type PostBuilder interface {
	// SetPostID sets the post ID for the query.
	SetPostID(postID model.PostID) PostBuilder
	// Execute sends the constructed query and returns the requested post and an error, if any.
	Execute() (*model.Post, error)
}

// NewGetPostBuilder creates a new instance of PostBuilder with the provided RequestContext.
//
// Parameters:
//   - requestContext: The context for the API request, including the host, user agent, username, and API key.
//
// Returns:
//   - PostBuilder: An instance of the PostBuilder interface.
func NewGetPostBuilder(requestContext model.RequestContext) PostBuilder {
	return &getPost{requestContext: requestContext}
}

// getPost is an implementation of the PostBuilder interface.
type getPost struct {
	requestContext model.RequestContext
	postID         model.PostID
}

// SetPostID sets the post ID for the query.
//
// Parameters:
//   - postID: The ID of the post to be retrieved.
//
// Returns:
//   - PostBuilder: The instance of the PostBuilder for method chaining.
func (g *getPost) SetPostID(postID model.PostID) PostBuilder {
	g.postID = postID
	return g
}

// Execute sends the constructed query and returns the requested post and an error, if any.
//
// Returns:
//   - *model.Post: The requested post.
//   - error: An error, if any, encountered during the API request or response handling.
func (g *getPost) Execute() (*model.Post, error) {
	if g.requestContext.RateLimiter != nil {
		err := g.requestContext.RateLimiter.Wait(context.Background())
		if err != nil {
			return nil, err
		}
	}
	post, err := endpoints.GetPost(g.requestContext, strconv.Itoa(int(g.postID)))
	if err != nil {
		return nil, err
	}
	return &post, nil
}