package routes

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

	"github.com/Wei-Shaw/sub2api/internal/config"
	"github.com/Wei-Shaw/sub2api/internal/handler"
	servermiddleware "github.com/Wei-Shaw/sub2api/internal/server/middleware"
	"github.com/Wei-Shaw/sub2api/internal/service"
	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/require"
)

func newGatewayRoutesTestRouter(platform ...string) *gin.Engine {
	gin.SetMode(gin.TestMode)
	router := gin.New()

	groupPlatform := service.PlatformOpenAI
	if len(platform) > 0 && platform[0] != "" {
		groupPlatform = platform[0]
	}

	RegisterGatewayRoutes(
		router,
		&handler.Handlers{
			Gateway:       &handler.GatewayHandler{},
			OpenAIGateway: &handler.OpenAIGatewayHandler{},
		},
		servermiddleware.APIKeyAuthMiddleware(func(c *gin.Context) {
			groupID := int64(1)
			c.Set(string(servermiddleware.ContextKeyAPIKey), &service.APIKey{
				GroupID: &groupID,
				Group:   &service.Group{Platform: groupPlatform},
			})
			c.Next()
		}),
		nil,
		nil,
		nil,
		nil,
		&config.Config{},
	)

	return router
}

func TestGatewayRoutesOpenAIResponsesCompactPathIsRegistered(t *testing.T) {
	router := newGatewayRoutesTestRouter()

	for _, path := range []string{
		"/v1/responses/compact",
		"/responses/compact",
		"/backend-api/codex/responses",
		"/backend-api/codex/responses/compact",
	} {
		req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(`{"model":"gpt-5"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		router.ServeHTTP(w, req)
		require.NotEqual(t, http.StatusNotFound, w.Code, "path=%s should hit OpenAI responses handler", path)
	}
}

func TestGatewayRoutesOpenAIAlphaSearchPathsAreRegistered(t *testing.T) {
	router := newGatewayRoutesTestRouter()
	registered := make(map[string]bool)
	for _, route := range router.Routes() {
		if route.Method == http.MethodPost {
			registered[route.Path] = true
		}
	}

	for _, path := range []string{
		"/v1/alpha/search",
		"/alpha/search",
		"/backend-api/codex/alpha/search",
	} {
		require.True(t, registered[path], "POST %s should be registered", path)
	}
}

func TestGatewayRoutesAlphaSearchRejectsNonOpenAIGroup(t *testing.T) {
	router := newGatewayRoutesTestRouter(service.PlatformGrok)
	req := httptest.NewRequest(http.MethodPost, "/v1/alpha/search", strings.NewReader(`{"model":"gpt-5.6-sol"}`))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()

	router.ServeHTTP(w, req)

	require.Equal(t, http.StatusNotFound, w.Code)
	require.Contains(t, w.Body.String(), "only available for OpenAI groups")
}

func TestGatewayRoutesOpenAIImagesPathsAreRegistered(t *testing.T) {
	router := newGatewayRoutesTestRouter()

	for _, path := range []string{
		"/v1/images/generations",
		"/v1/images/edits",
		"/images/generations",
		"/images/edits",
	} {
		req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(`{"model":"gpt-image-2","prompt":"draw a cat"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		router.ServeHTTP(w, req)
		require.NotEqual(t, http.StatusNotFound, w.Code, "path=%s should hit OpenAI images handler", path)
	}
}

func TestGatewayRoutesGrokImagesAndVideosPathsAreRegistered(t *testing.T) {
	router := newGatewayRoutesTestRouter(service.PlatformGrok)

	for _, path := range []string{
		"/v1/images/generations",
		"/v1/images/edits",
		"/images/generations",
		"/images/edits",
		"/v1/videos/generations",
		"/videos/generations",
		"/v1/videos/edits",
		"/videos/edits",
		"/v1/videos/extensions",
		"/videos/extensions",
	} {
		req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(`{"model":"grok-imagine","prompt":"draw a cat"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		router.ServeHTTP(w, req)
		require.NotEqual(t, http.StatusNotFound, w.Code, "path=%s should hit Grok media handler", path)
		require.NotContains(t, w.Body.String(), "not supported for this platform")
	}

	for _, path := range []string{
		"/v1/videos/request-123",
		"/videos/request-123",
	} {
		req := httptest.NewRequest(http.MethodGet, path, nil)
		w := httptest.NewRecorder()

		router.ServeHTTP(w, req)
		require.NotEqual(t, http.StatusNotFound, w.Code, "path=%s should hit Grok video handler", path)
		require.NotContains(t, w.Body.String(), "not supported for this platform")
	}
}

func TestGatewayRoutesNonGrokVideosAreRejectedAtPlatformGate(t *testing.T) {
	router := newGatewayRoutesTestRouter(service.PlatformOpenAI)

	for _, tc := range []struct {
		method string
		path   string
		body   string
	}{
		{http.MethodPost, "/v1/videos/generations", `{"model":"grok-imagine-video-1.5","prompt":"waves"}`},
		{http.MethodPost, "/videos/generations", `{"model":"grok-imagine-video-1.5","prompt":"waves"}`},
		{http.MethodPost, "/v1/videos/edits", `{"model":"grok-imagine-video","prompt":"waves","video":{"url":"https://example.com/in.mp4"}}`},
		{http.MethodPost, "/videos/edits", `{"model":"grok-imagine-video","prompt":"waves","video":{"url":"https://example.com/in.mp4"}}`},
		{http.MethodPost, "/v1/videos/extensions", `{"model":"grok-imagine-video","prompt":"waves","video":{"url":"https://example.com/in.mp4"}}`},
		{http.MethodPost, "/videos/extensions", `{"model":"grok-imagine-video","prompt":"waves","video":{"url":"https://example.com/in.mp4"}}`},
		{http.MethodGet, "/v1/videos/request-123", ""},
		{http.MethodGet, "/videos/request-123", ""},
	} {
		req := httptest.NewRequest(tc.method, tc.path, strings.NewReader(tc.body))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		router.ServeHTTP(w, req)
		require.Equal(t, http.StatusNotFound, w.Code, "method=%s path=%s", tc.method, tc.path)
		require.Contains(t, w.Body.String(), "Videos API is not supported for this platform")
	}
}

func TestGatewayRoutesGrokAllowsCLICompatibilityEntrypoints(t *testing.T) {
	router := newGatewayRoutesTestRouter(service.PlatformGrok)

	for _, tc := range []struct {
		method string
		path   string
	}{
		{http.MethodPost, "/v1/messages"},
		{http.MethodPost, "/v1/chat/completions"},
		{http.MethodPost, "/chat/completions"},
		{http.MethodGet, "/v1/responses"},
		{http.MethodGet, "/responses"},
		{http.MethodGet, "/backend-api/codex/responses"},
	} {
		req := httptest.NewRequest(tc.method, tc.path, strings.NewReader(`{"model":"grok"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		router.ServeHTTP(w, req)
		require.NotEqual(t, http.StatusNotFound, w.Code, "method=%s path=%s", tc.method, tc.path)
		require.NotContains(t, w.Body.String(), "not supported for Grok groups")
	}

	req := httptest.NewRequest(http.MethodPost, "/v1/messages/count_tokens", strings.NewReader(`{"model":"grok","messages":[{"role":"user","content":"hi"}]}`))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()

	router.ServeHTTP(w, req)
	require.Equal(t, http.StatusNotFound, w.Code)
	require.Contains(t, w.Body.String(), "Token counting is not supported for this platform")

	for _, path := range []string{
		"/v1/responses",
		"/responses",
		"/backend-api/codex/responses",
	} {
		req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(`{"model":"grok","input":"hi"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		router.ServeHTTP(w, req)
		require.NotEqual(t, http.StatusNotFound, w.Code, "path=%s should still reach Responses handler", path)
	}
}

func TestGatewayRoutesOpenAICountTokensPathIsRegistered(t *testing.T) {
	router := newGatewayRoutesTestRouter(service.PlatformOpenAI)

	req := httptest.NewRequest(http.MethodPost, "/v1/messages/count_tokens", strings.NewReader(`{"model":"claude-sonnet-4-5","messages":[{"role":"user","content":"hi"}]}`))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()

	router.ServeHTTP(w, req)
	require.NotEqual(t, http.StatusNotFound, w.Code)
}