// SPDX-License-Identifier: EUPL-1.2

package api_test

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

	"github.com/gin-gonic/gin"

	api "forge.lthn.ai/core/go-api"
)

// ── Stub implementations ────────────────────────────────────────────────

type stubGroup struct{}

func (s *stubGroup) Name() string     { return "stub" }
func (s *stubGroup) BasePath() string { return "/stub" }
func (s *stubGroup) RegisterRoutes(rg *gin.RouterGroup) {
	rg.GET("/ping", func(c *gin.Context) {
		c.JSON(http.StatusOK, api.OK("pong"))
	})
}

type stubStreamGroup struct {
	stubGroup
}

func (s *stubStreamGroup) Channels() []string {
	return []string{"events", "updates"}
}

// ── RouteGroup interface ────────────────────────────────────────────────

func TestRouteGroup_Good_InterfaceSatisfaction(t *testing.T) {
	var g api.RouteGroup = &stubGroup{}

	if g.Name() != "stub" {
		t.Fatalf("expected Name=%q, got %q", "stub", g.Name())
	}
	if g.BasePath() != "/stub" {
		t.Fatalf("expected BasePath=%q, got %q", "/stub", g.BasePath())
	}
}

func TestRouteGroup_Good_RegisterRoutes(t *testing.T) {
	gin.SetMode(gin.TestMode)
	engine := gin.New()

	g := &stubGroup{}
	rg := engine.Group(g.BasePath())
	g.RegisterRoutes(rg)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/stub/ping", nil)
	engine.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d", w.Code)
	}
}

// ── StreamGroup interface ───────────────────────────────────────────────

func TestStreamGroup_Good_InterfaceSatisfaction(t *testing.T) {
	var g api.StreamGroup = &stubStreamGroup{}

	channels := g.Channels()
	if len(channels) != 2 {
		t.Fatalf("expected 2 channels, got %d", len(channels))
	}
	if channels[0] != "events" {
		t.Fatalf("expected channels[0]=%q, got %q", "events", channels[0])
	}
	if channels[1] != "updates" {
		t.Fatalf("expected channels[1]=%q, got %q", "updates", channels[1])
	}
}

func TestStreamGroup_Good_AlsoSatisfiesRouteGroup(t *testing.T) {
	sg := &stubStreamGroup{}

	// A StreamGroup's embedded stubGroup should also satisfy RouteGroup.
	var rg api.RouteGroup = sg
	if rg.Name() != "stub" {
		t.Fatalf("expected Name=%q, got %q", "stub", rg.Name())
	}
}