package httpapi

import (
	"context"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"net/url"
	"testing"

	"github.com/easyai/easyai-ai-gateway/apps/api/internal/auth"
	"github.com/easyai/easyai-ai-gateway/apps/api/internal/config"
	"github.com/easyai/easyai-ai-gateway/apps/api/internal/store"
)

func TestParseModelUsageSceneQuery(t *testing.T) {
	t.Parallel()

	for _, testCase := range []struct {
		name    string
		query   url.Values
		want    string
		wantErr bool
	}{
		{name: "missing", query: url.Values{}, want: ""},
		{name: "desktop", query: url.Values{"usage_scene": {"desktop"}}, want: "desktop"},
		{name: "canvas", query: url.Values{"usage_scene": {"canvas_model_node"}}, want: "canvas_model_node"},
		{name: "empty", query: url.Values{"usage_scene": {""}}, wantErr: true},
		{name: "unknown", query: url.Values{"usage_scene": {"mobile"}}, wantErr: true},
		{name: "duplicate", query: url.Values{"usage_scene": {"desktop", "canvas_model_node"}}, wantErr: true},
	} {
		testCase := testCase
		t.Run(testCase.name, func(t *testing.T) {
			t.Parallel()
			got, err := parseModelUsageSceneQuery(testCase.query)
			if testCase.wantErr {
				if err == nil {
					t.Fatal("expected usage_scene validation error")
				}
				return
			}
			if err != nil {
				t.Fatalf("parse usage_scene: %v", err)
			}
			if got != testCase.want {
				t.Fatalf("usage_scene = %q, want %q", got, testCase.want)
			}
		})
	}
}

func TestListServerMainUsageSceneModelIDs(t *testing.T) {
	t.Parallel()

	serverMain := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/integration-platform/models/strict/all" {
			t.Errorf("path = %q", r.URL.Path)
		}
		if got := r.URL.Query().Get("usage_scene"); got != "desktop" {
			t.Errorf("usage_scene = %q", got)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = io.WriteString(w, `{"data":[{"alias":"Qwen3.7-Plus"},{"invocationName":"GPT-5"},{"legacyAliases":["gpt-latest"]}]}`)
	}))
	defer serverMain.Close()

	authenticator := auth.New("secret", serverMain.URL, "")
	gateway := &Server{
		cfg:    config.Config{ServerMainBaseURL: serverMain.URL},
		auth:   authenticator,
		logger: slog.New(slog.NewTextHandler(io.Discard, nil)),
	}
	ids, err := gateway.listServerMainUsageSceneModelIDs(context.Background(), "desktop")
	if err != nil {
		t.Fatalf("list server-main usage scene models: %v", err)
	}
	for _, id := range []string{"qwen3.7-plus", "gpt-5", "gpt-latest"} {
		if _, ok := ids[id]; !ok {
			t.Errorf("missing normalized model ID %q in %#v", id, ids)
		}
	}
}

func TestFilterPlatformModelsByUsageSceneIDs(t *testing.T) {
	t.Parallel()

	models := []store.PlatformModel{
		{ID: "allowed-by-invocation", ModelName: "Qwen3.7-Plus", ProviderModelName: "qwen3.7-plus-2026-07-01"},
		{ID: "allowed-by-provider-name", ModelName: "GPT-5", ProviderModelName: "gpt-5-2026-07-01"},
		{ID: "allowed-by-legacy-alias", ModelName: "renamed-model", LegacyAliases: store.StringList{"old-model"}},
		{ID: "desktop-restricted", ModelName: "Qwen3.6-Plus", ProviderModelName: "qwen3.6-plus-2026-04-02"},
	}
	allowed := map[string]struct{}{
		"qwen3.7-plus":     {},
		"gpt-5-2026-07-01": {},
		"old-model":        {},
	}

	filtered := filterPlatformModelsByUsageSceneIDs(models, allowed)
	if len(filtered) != 3 {
		t.Fatalf("filtered model count = %d, want 3: %#v", len(filtered), filtered)
	}
	for _, model := range filtered {
		if model.ID == "desktop-restricted" {
			t.Fatalf("desktop-restricted model remained in filtered catalog: %#v", filtered)
		}
	}
}

func TestListServerMainUsageSceneModelIDsRejectsMalformedPayload(t *testing.T) {
	t.Parallel()

	serverMain := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = io.WriteString(w, `{"success":true}`)
	}))
	defer serverMain.Close()

	gateway := &Server{
		cfg:  config.Config{ServerMainBaseURL: serverMain.URL},
		auth: auth.New("secret", serverMain.URL, ""),
	}
	if _, err := gateway.listServerMainUsageSceneModelIDs(context.Background(), "desktop"); err == nil {
		t.Fatal("expected malformed upstream payload error")
	}
}

func TestListServerMainUsageSceneModelIDsFallsBackToDirectServerMainRoute(t *testing.T) {
	t.Parallel()

	requestedPaths := make([]string, 0, 2)
	serverMain := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		requestedPaths = append(requestedPaths, r.URL.Path)
		if r.URL.Path == "/api/integration-platform/models/strict/all" {
			http.NotFound(w, r)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = io.WriteString(w, `[{"alias":"Qwen3.7-Plus"}]`)
	}))
	defer serverMain.Close()

	gateway := &Server{
		cfg:  config.Config{ServerMainBaseURL: serverMain.URL},
		auth: auth.New("secret", serverMain.URL, ""),
	}
	ids, err := gateway.listServerMainUsageSceneModelIDs(context.Background(), "desktop")
	if err != nil {
		t.Fatalf("list direct server-main usage scene models: %v", err)
	}
	if _, ok := ids["qwen3.7-plus"]; !ok {
		t.Fatalf("missing direct server-main model ID: %#v", ids)
	}
	if len(requestedPaths) != 2 ||
		requestedPaths[0] != "/api/integration-platform/models/strict/all" ||
		requestedPaths[1] != "/integration-platform/models/strict/all" {
		t.Fatalf("unexpected server-main route probes: %#v", requestedPaths)
	}
}