package main

import (
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func TestSubjectsReceiveStableIsolatedSlots(t *testing.T) {
	statePath := filepath.Join(t.TempDir(), "tenants.json")
	router, err := newTenantRouter(statePath, 2, func(slot int) string { return "" })
	if err != nil {
		t.Fatal(err)
	}
	first, err := router.slotFor("keycloak-subject-a")
	if err != nil {
		t.Fatal(err)
	}
	again, _ := router.slotFor("keycloak-subject-a")
	second, err := router.slotFor("keycloak-subject-b")
	if err != nil {
		t.Fatal(err)
	}
	if first != again || first == second {
		t.Fatalf("unexpected slots: first=%d again=%d second=%d", first, again, second)
	}
	if _, err := router.slotFor("keycloak-subject-c"); err == nil {
		t.Fatal("expected the fixed private tenant pool to report capacity")
	}
	reloaded, err := newTenantRouter(statePath, 2, func(slot int) string { return "" })
	if err != nil {
		t.Fatal(err)
	}
	persisted, _ := reloaded.slotFor("keycloak-subject-a")
	if persisted != first {
		t.Fatalf("assignment changed after reload: %d != %d", persisted, first)
	}
}

func TestRouterBlocksAdministrationAndRequiresIdentity(t *testing.T) {
	router, err := newTenantRouter(filepath.Join(t.TempDir(), "state.json"), 1, func(slot int) string { return "http://127.0.0.1" })
	if err != nil {
		t.Fatal(err)
	}
	for _, test := range []struct {
		method string
		path   string
		user   string
		want   int
	}{
		{http.MethodGet, "/", "", http.StatusUnauthorized},
		{http.MethodPost, "/api/providers", "subject", http.StatusForbidden},
		{http.MethodPost, "/api/commands/exec", "subject", http.StatusForbidden},
		{http.MethodGet, "/api/dashboard/config", "subject", http.StatusForbidden},
		{http.MethodGet, "/api/env", "subject", http.StatusForbidden},
	} {
		request := httptest.NewRequest(test.method, test.path, nil)
		request.Header.Set("X-Forwarded-User", test.user)
		response := httptest.NewRecorder()
		router.ServeHTTP(response, request)
		if response.Code != test.want {
			t.Fatalf("%s %s: got %d, want %d", test.method, test.path, response.Code, test.want)
		}
	}
}

func TestRouterProxiesWebUIAndAddsTelegramShortcut(t *testing.T) {
	backend := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		if request.Header.Get("X-Forwarded-User") != "" || request.Header.Get("Cookie") != "" {
			t.Fatal("identity or session cookie leaked to tenant backend")
		}
		writer.Header().Set("Content-Type", "text/html; charset=utf-8")
		_, _ = io.WriteString(writer, "<html><head></head><body>Hermes WebUI</body></html>")
	}))
	defer backend.Close()
	router, err := newTenantRouter(filepath.Join(t.TempDir(), "state.json"), 1, func(slot int) string { return backend.URL })
	if err != nil {
		t.Fatal(err)
	}
	request := httptest.NewRequest(http.MethodGet, "/", nil)
	request.Header.Set("X-Forwarded-User", "subject")
	request.Header.Set("Cookie", "oauth-cookie")
	response := httptest.NewRecorder()
	router.ServeHTTP(response, request)
	if response.Code != http.StatusOK {
		t.Fatalf("got status %d", response.Code)
	}
	if !strings.Contains(response.Body.String(), "hermes-chat-bridge.js") || !strings.Contains(response.Body.String(), "hermes-chat-bridge.css") {
		t.Fatal("Telegram shortcut assets were not injected")
	}
}

func TestWebUIModelAndReasoningOverridesAreProxied(t *testing.T) {
	backend := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		if request.Method != http.MethodPost {
			t.Fatalf("got method %s", request.Method)
		}
		writer.WriteHeader(http.StatusNoContent)
	}))
	defer backend.Close()
	router, err := newTenantRouter(filepath.Join(t.TempDir(), "state.json"), 1, func(slot int) string { return backend.URL })
	if err != nil {
		t.Fatal(err)
	}
	for _, path := range []string{"/api/model/set", "/api/reasoning"} {
		request := httptest.NewRequest(http.MethodPost, path, strings.NewReader(`{}`))
		request.Header.Set("X-Forwarded-User", "subject")
		response := httptest.NewRecorder()
		router.ServeHTTP(response, request)
		if response.Code != http.StatusNoContent {
			t.Fatalf("POST %s: got %d", path, response.Code)
		}
	}
}

func TestTelegramLinkUsesHashedStateAndExpires(t *testing.T) {
	statePath := filepath.Join(t.TempDir(), "state.json")
	router, err := newTenantRouter(statePath, 1, func(slot int) string { return "" })
	if err != nil {
		t.Fatal(err)
	}
	now := time.Date(2026, 8, 8, 12, 0, 0, 0, time.UTC)
	router.now = func() time.Time { return now }
	code, expires, err := router.createLink("raw-keycloak-subject")
	if err != nil {
		t.Fatal(err)
	}
	if expires.Sub(now) != 10*time.Minute {
		t.Fatalf("unexpected expiry: %s", expires)
	}
	if _, err := router.consumeLink("123456789", code); err != nil {
		t.Fatal(err)
	}
	if _, linked := router.telegramSlot("123456789"); !linked {
		t.Fatal("Telegram identity was not linked")
	}
	content, err := os.ReadFile(statePath)
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(string(content), "raw-keycloak-subject") || strings.Contains(string(content), "123456789") || strings.Contains(string(content), code) {
		t.Fatal("raw identity or one-time code was persisted")
	}
	secondCode, _, err := router.createLink("raw-keycloak-subject")
	if err != nil {
		t.Fatal(err)
	}
	router.now = func() time.Time { return now.Add(11 * time.Minute) }
	if _, err := router.consumeLink("987654321", secondCode); err == nil {
		t.Fatal("expected expired link code to be rejected")
	}
}

func TestTelegramWebActionsRequireExplicitSameOriginHeader(t *testing.T) {
	router, err := newTenantRouter(filepath.Join(t.TempDir(), "state.json"), 1, func(slot int) string { return "" })
	if err != nil {
		t.Fatal(err)
	}
	router.telegram = &telegramBot{}
	request := httptest.NewRequest(http.MethodPost, "/api/telegram/link", strings.NewReader(`{}`))
	request.Header.Set("X-Forwarded-User", "subject")
	request.Header.Set("Content-Type", "application/json")
	response := httptest.NewRecorder()
	router.ServeHTTP(response, request)
	if response.Code != http.StatusForbidden {
		t.Fatalf("got %d", response.Code)
	}
	request = httptest.NewRequest(http.MethodPost, "/api/telegram/link", strings.NewReader(`{}`))
	request.Header.Set("X-Forwarded-User", "subject")
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("X-Hermes-Action", "telegram-link")
	response = httptest.NewRecorder()
	router.ServeHTTP(response, request)
	if response.Code != http.StatusOK {
		t.Fatalf("got %d: %s", response.Code, response.Body.String())
	}
}
