package ai_summarizer

import (
	"errors"
	"fmt"
)

// Common sentinel errors for the AI summarizer package.
var (
	// ErrSummaryNotReady is returned when the tender.json exists but
	// summarize_status.done is still false.
	ErrSummaryNotReady = errors.New("ai_summarizer: summary not ready yet")

	// ErrNoOverallSummary is returned when the pipeline is done but
	// summary / overall_summary text is empty.
	ErrNoOverallSummary = errors.New("ai_summarizer: tender summary is empty")

	// ErrTranslationNotReady is returned when tender.json exists but the
	// requested language is not listed in translation_status.done yet.
	ErrTranslationNotReady = errors.New("ai_summarizer: translation not ready yet")

	// ErrNoTranslation is returned when translation_status marks a language done
	// but translations[language] is missing or empty.
	ErrNoTranslation = errors.New("ai_summarizer: translation is empty")

	// ErrObjectNotFound is returned when the tender.json object does not
	// exist in the MinIO bucket (HTTP 404 / NoSuchKey).
	ErrObjectNotFound = errors.New("ai_summarizer: tender.json not found in storage")

	// ErrBucketNotFound is returned when the MinIO bucket does not exist.
	ErrBucketNotFound = errors.New("ai_summarizer: bucket not found")

	// ErrMinIOUnavailable is returned when MinIO cannot be reached (network,
	// timeout, connection refused, etc.) as opposed to a missing object key.
	ErrMinIOUnavailable = errors.New("ai_summarizer: MinIO connection unavailable")

	// ErrAPINonSuccess is returned when the AI API returns a non-2xx status code.
	ErrAPINonSuccess = errors.New("ai_summarizer: API returned non-success status")

	// ErrPipelineJobRunning is returned when a single-flight pipeline job is already running (HTTP 409).
	ErrPipelineJobRunning = errors.New("ai_summarizer: pipeline job already running")
)

// APIStatusError carries the HTTP status and response body from the Opplens AI service.
type APIStatusError struct {
	StatusCode int
	Body       string
}

func (e *APIStatusError) Error() string {
	if e == nil {
		return ""
	}
	return fmt.Sprintf("ai_summarizer: API returned status %d, body: %s", e.StatusCode, e.Body)
}

// Is reports whether target is ErrAPINonSuccess.
func (e *APIStatusError) Is(target error) bool {
	return target == ErrAPINonSuccess
}