package builder

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

// UserBuilder represents a builder for constructing queries to retrieve user information.
type UserBuilder interface {
	// SetUsername sets the username for the query to retrieve user information.
	SetUsername(username string) UserBuilder
	// Execute sends the constructed query and returns the requested user information and an error, if any.
	Execute() (model.User, error)
}

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

// getUser is an implementation of the UserBuilder interface.
type getUser struct {
	requestContext model.RequestContext
	username       string
}

// SetUsername sets the username for the query to retrieve user information.
//
// Parameters:
//   - username: The username to retrieve information for.
//
// Returns:
//   - UserBuilder: The instance of the UserBuilder for method chaining.
func (g *getUser) SetUsername(username string) UserBuilder {
	g.username = username
	return g
}

// Execute sends the constructed query and returns the requested user information and an error, if any.
//
// Returns:
//   - model.User: The user information.
//   - error: An error, if any, encountered during the API request or response handling.
func (g *getUser) Execute() (model.User, error) {
	if g.requestContext.RateLimiter != nil {
		err := g.requestContext.RateLimiter.Wait(context.Background())
		if err != nil {
			return model.User{}, err
		}
	}
	user, err := endpoints.GetUser(g.requestContext, g.username)
	if err != nil {
		return model.User{}, err
	}
	return user, nil
}