package ollama

import (
	"fmt"
)

// ConnectionError wraps a network-level error when the Ollama target is unreachable.
// Phase 3 uses this to distinguish connection failures (retry-eligible) from HTTP
// errors (usually not retryable).
//
// Why: callers must differentiate "target is down" from "target returned 4xx/5xx"
// to decide on retry strategy.
// What: wraps a net-level error and satisfies the error and Unwrap interfaces.
// Test: create a ConnectionError, verify errors.Is/As can match it.
type ConnectionError struct {
	URL string
	Err error
}

func (e *ConnectionError) Error() string {
	return fmt.Sprintf("connection to ollama target %s failed: %v", e.URL, e.Err)
}

func (e *ConnectionError) Unwrap() error {
	return e.Err
}

// HTTPError represents a non-2xx HTTP response from the Ollama target.
//
// Why: callers need the status code to distinguish client errors (4xx) from
// server errors (5xx) and decide on retry logic.
// What: holds the HTTP status code and response body for error diagnosis.
// Test: create an HTTPError with status 500, verify Error() includes the code.
type HTTPError struct {
	StatusCode int
	Body       string
}

func (e *HTTPError) Error() string {
	return fmt.Sprintf("ollama target returned HTTP %d: %s", e.StatusCode, e.Body)
}