package api

import (
	"fmt"
	"time"
)

// APIError represents an error response from the Tangled XRPC API.
type APIError struct {
	StatusCode int
	ErrorType  string `json:"error"`
	Message    string `json:"message"`
	NSID       string `json:"-"` // the procedure that failed
}

func (e *APIError) Error() string {
	if e.Message != "" {
		return fmt.Sprintf("%s: %s (HTTP %d)", e.ErrorType, e.Message, e.StatusCode)
	}
	return fmt.Sprintf("%s (HTTP %d)", e.ErrorType, e.StatusCode)
}

// IsNotFound returns true if this is a 404 error.
func (e *APIError) IsNotFound() bool {
	return e.StatusCode == 404
}

// IsForbidden returns true if this is a 403 error.
func (e *APIError) IsForbidden() bool {
	return e.StatusCode == 403
}

// IsUnauthorized returns true if this is a 401 error.
func (e *APIError) IsUnauthorized() bool {
	return e.StatusCode == 401
}

// RateLimitError indicates the API rate limit has been exceeded.
type RateLimitError struct {
	RetryAfter time.Duration
	Inner      *APIError
}

func (e *RateLimitError) Error() string {
	return fmt.Sprintf("rate limited: retry after %s", e.RetryAfter)
}

func (e *RateLimitError) Unwrap() error {
	return e.Inner
}