package apiresponse

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestWriteError(t *testing.T) {
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req = req.WithContext(WithTraceID(req.Context(), "trace-123"))

	rec := httptest.NewRecorder()
	WriteError(rec, req, http.StatusUnauthorized, CodeAuthInvalidToken, "invalid token", map[string]string{
		"reason": "expired",
	})

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusUnauthorized)
	}
	if ct := rec.Header().Get("Content-Type"); ct != "application/json; charset=utf-8" {
		t.Fatalf("content-type = %q", ct)
	}

	var body ErrorBody
	if err := json.NewDecoder(rec.Body).Decode(&body); err != nil {
		t.Fatalf("decode body: %v", err)
	}
	if body.Code != CodeAuthInvalidToken {
		t.Fatalf("code = %q", body.Code)
	}
	if body.Message != "invalid token" {
		t.Fatalf("message = %q", body.Message)
	}
	if body.TraceID != "trace-123" {
		t.Fatalf("trace_id = %q", body.TraceID)
	}
	details, ok := body.Details.(map[string]any)
	if !ok || details["reason"] != "expired" {
		t.Fatalf("details = %#v", body.Details)
	}
}