package httputil

import (
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"sourcecraft.dev/bigbes/huntsman/internal/pkg/apierror"
)

func TestJSONStatusAndBody(t *testing.T) {
	rr := httptest.NewRecorder()
	JSON(rr, 201, map[string]int{"n": 7})

	if rr.Code != 201 {
		t.Errorf("status = %d", rr.Code)
	}
	if got := rr.Header().Get("Content-Type"); got != "application/json" {
		t.Errorf("content-type = %q", got)
	}
	var body map[string]int
	if err := json.Unmarshal(rr.Body.Bytes(), &body); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if body["n"] != 7 {
		t.Errorf("body = %+v", body)
	}
}

func TestJSONNilDataWritesNoBody(t *testing.T) {
	rr := httptest.NewRecorder()
	JSON(rr, 204, nil)
	if rr.Code != 204 {
		t.Errorf("status = %d", rr.Code)
	}
	if rr.Body.Len() != 0 {
		t.Errorf("body should be empty, got %q", rr.Body.String())
	}
}

func TestOK(t *testing.T) {
	rr := httptest.NewRecorder()
	OK(rr, map[string]string{"hello": "world"})
	if rr.Code != 200 {
		t.Errorf("status = %d", rr.Code)
	}
}

func TestErrorMapsClientError(t *testing.T) {
	rr := httptest.NewRecorder()
	req := httptest.NewRequestWithContext(t.Context(), "GET", "/foo", http.NoBody)
	Error(rr, req, apierror.NotFound("widget"))
	if rr.Code != 404 {
		t.Errorf("status = %d", rr.Code)
	}
	if got := rr.Header().Get("Content-Type"); got != "application/problem+json" {
		t.Errorf("content-type = %q", got)
	}
}

func TestErrorMapsInternalError(t *testing.T) {
	rr := httptest.NewRecorder()
	req := httptest.NewRequestWithContext(t.Context(), "GET", "/foo", http.NoBody)
	Error(rr, req, errors.New("boom"))
	if rr.Code != 500 {
		t.Errorf("status = %d", rr.Code)
	}
	// Internal detail should not leak in the body.
	if got := rr.Body.String(); strings.Contains(got, "boom") {
		t.Errorf("response body leaks internal error: %q", got)
	}
}