package contracts

import "errors"

// ErrInvalidStructuredOutput identifies a provider response that cannot satisfy
// the caller's declared structured-output contract.
var ErrInvalidStructuredOutput = errors.New("invalid structured output")

// ErrLLMCapacityExceeded identifies backend admission exhaustion before model
// generation begins.
var ErrLLMCapacityExceeded = errors.New("LLM capacity exceeded")

// ErrLLMGeneration identifies a provider generation failure.
var ErrLLMGeneration = errors.New("LLM generation failed")

type LLMGenerationError struct {
	status     int
	diagnostic string
}

func NewLLMGenerationError(status int, diagnostic string) *LLMGenerationError {
	if status < 0 {
		status = 0
	}
	return &LLMGenerationError{status: status, diagnostic: diagnostic}
}
func (e *LLMGenerationError) Error() string {
	if e == nil || e.diagnostic == "" {
		return ErrLLMGeneration.Error()
	}
	return e.diagnostic
}
func (e *LLMGenerationError) Unwrap() error { return ErrLLMGeneration }
func (e *LLMGenerationError) StatusCode() int {
	if e == nil {
		return 0
	}
	return e.status
}