package response

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

	errorspkg "github.com/company/ai-ops/pkg/errors"
)

func TestJSONWritesStatusContentTypeAndBody(t *testing.T) {
	w := httptest.NewRecorder()

	JSON(w, http.StatusCreated, map[string]string{"ok": "true"})

	if w.Code != http.StatusCreated {
		t.Fatalf("status = %d", w.Code)
	}
	if got := w.Header().Get("Content-Type"); got != "application/json" {
		t.Fatalf("content-type = %s", got)
	}
	if got := w.Body.String(); got != "{\"ok\":\"true\"}\n" {
		t.Fatalf("body = %s", got)
	}
}

func TestSuccessAndErrorResponses(t *testing.T) {
	t.Run("success", func(t *testing.T) {
		w := httptest.NewRecorder()
		Success(w, map[string]any{"id": "1"})
		var out Response
		if err := json.Unmarshal(w.Body.Bytes(), &out); err != nil {
			t.Fatal(err)
		}
		data := out.Data.(map[string]any)
		if data["id"] != "1" {
			t.Fatalf("unexpected data: %+v", out.Data)
		}
	})

	t.Run("error", func(t *testing.T) {
		w := httptest.NewRecorder()
		Error(w, errorspkg.ErrForbidden)
		if w.Code != http.StatusForbidden {
			t.Fatalf("status = %d", w.Code)
		}
		if got := w.Body.String(); got == "" || !json.Valid(w.Body.Bytes()) {
			t.Fatalf("invalid json body: %q", got)
		}
	})
}

func TestPaginatedResponseComputesTotalPages(t *testing.T) {
	w := httptest.NewRecorder()
	PaginatedResponse(w, []string{"a", "b"}, 21, 2, 10)

	var out Response
	if err := json.Unmarshal(w.Body.Bytes(), &out); err != nil {
		t.Fatal(err)
	}
	payload := out.Data.(map[string]any)
	if payload["total_pages"].(float64) != 3 {
		t.Fatalf("total_pages = %+v", payload["total_pages"])
	}
}