package main

import (
	"errors"
	"net/http"
	"testing"
)

type failingWriter struct {
	header http.Header
}

func (f *failingWriter) Header() http.Header {
	if f.header == nil {
		f.header = http.Header{}
	}
	return f.header
}

func (f *failingWriter) WriteHeader(status int) {}

func (f *failingWriter) Write([]byte) (int, error) {
	return 0, errors.New("boom")
}

func TestWriteJSONWriteError(t *testing.T) {
	w := &failingWriter{}
	writeJSON(w, map[string]any{"ok": true})
	if got := w.Header().Get("Content-Type"); got != "text/plain; charset=utf-8" {
		t.Fatalf("expected fallback error content type, got %q", got)
	}
}

func TestEnvDefaultsAndContains(t *testing.T) {
	if got := env("PEGASUS_TEST_MISSING", "fallback"); got != "fallback" {
		t.Fatalf("unexpected env fallback %q", got)
	}
	if !contains([]string{"a", "b"}, "a") {
		t.Fatalf("expected contains to find value")
	}
	if contains([]string{"a", "b"}, "z") {
		t.Fatalf("expected contains to return false")
	}
}

func TestSanitizeSegmentTrimsAndClamps(t *testing.T) {
	if got := sanitizeSegment("  /A bad/segment  "); got != "A_bad" {
		t.Fatalf("unexpected sanitized segment %q", got)
	}

	long := "abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz0123456789"
	if got := sanitizeSegment(long); len(got) != 64 {
		t.Fatalf("expected 64-char clamp, got %d", len(got))
	}
}
