Add explorer AI chat and context endpoints

backend/api/rest/api_test.go

@@ -1,6 +1,7 @@
 package rest_test
 
 import (
+	"bytes"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -109,8 +110,8 @@ func TestSearchEndpoint(t *testing.T) {
 	_, mux := setupTestServer(t)
 
 	testCases := []struct {
-		name    string
-		query   string
+		name     string
+		query    string
 		wantCode int
 	}{
 		{"block number", "?q=1000", http.StatusOK},
@@ -179,7 +180,7 @@ func TestErrorHandling(t *testing.T) {
 	mux.ServeHTTP(w, req)
 
 	assert.True(t, w.Code >= http.StatusBadRequest)
-	
+
 	var errorResponse map[string]interface{}
 	err := json.Unmarshal(w.Body.Bytes(), &errorResponse)
 	if err == nil {
@@ -213,6 +214,33 @@ func TestPagination(t *testing.T) {
 	}
 }
 
+func TestAIContextEndpoint(t *testing.T) {
+	_, mux := setupTestServer(t)
+
+	req := httptest.NewRequest("GET", "/api/v1/ai/context?q=cUSDT+bridge", nil)
+	w := httptest.NewRecorder()
+	mux.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusOK, w.Code)
+
+	var response map[string]interface{}
+	err := json.Unmarshal(w.Body.Bytes(), &response)
+	require.NoError(t, err)
+	assert.NotNil(t, response["context"])
+}
+
+func TestAIChatEndpointRequiresOpenAIKey(t *testing.T) {
+	_, mux := setupTestServer(t)
+
+	body := bytes.NewBufferString(`{"messages":[{"role":"user","content":"What is live on Chain 138?"}]}`)
+	req := httptest.NewRequest("POST", "/api/v1/ai/chat", body)
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	mux.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusServiceUnavailable, w.Code)
+}
+
 // TestRequestTimeout tests request timeout handling
 func TestRequestTimeout(t *testing.T) {
 	// This would test timeout behavior
@@ -225,11 +253,10 @@ func BenchmarkListBlocks(b *testing.B) {
 	_, mux := setupTestServer(&testing.T{})
 
 	req := httptest.NewRequest("GET", "/api/v1/blocks?limit=10&page=1", nil)
-	
+
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		w := httptest.NewRecorder()
 		mux.ServeHTTP(w, req)
 	}
 }
-