Initial commit: email-openclaw bridge v1

Full pipeline: IMAP ingress -> OpenClaw dispatch -> callback -> SMTP reply.
SQLite stateful storage with idempotency, threading, and retry logic.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/ai_client/client_test.go

@@ -0,0 +1,114 @@
+package ai_client_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"sync/atomic"
+	"testing"
+
+	"thuanle.me/claw-email-bridge/internal/ai_client"
+	"thuanle.me/claw-email-bridge/internal/config"
+	"thuanle.me/claw-email-bridge/internal/database"
+)
+
+// Test matrix #2: OpenClaw fail 2 lần, lần 3 thành công → COMPLETED, attempt_openclaw = 3.
+func TestDispatch_RetryThenSuccess(t *testing.T) {
+	tdb := database.NewTestDB(t)
+
+	var callCount atomic.Int32
+	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		n := callCount.Add(1)
+		if n <= 2 {
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("temporary error"))
+			return
+		}
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`{"status":"ok"}`))
+	}))
+	defer mockServer.Close()
+
+	cfg := &config.Config{
+		OpenClawURL: mockServer.URL,
+		ListenAddr:  ":9999",
+	}
+
+	task := &database.Task{
+		TaskUUID:  "uuid-retry-test",
+		ThreadID:  "thread-1",
+		MessageID: "msg-retry@test.com",
+		Sender:    "user@test.com",
+		Subject:   "Retry test",
+		BodyPlain: "Hello",
+		Status:    database.StatusReceived,
+	}
+	if err := database.CreateTask(tdb.DB, task); err != nil {
+		t.Fatalf("create task: %v", err)
+	}
+
+	dispatcher := ai_client.NewDispatcher(cfg, tdb.DB)
+	dispatcher.Dispatch(task) // Synchronous call for testing.
+
+	// Verify 3 attempts were made.
+	if callCount.Load() != 3 {
+		t.Errorf("expected 3 API calls, got %d", callCount.Load())
+	}
+
+	// Reload task from DB.
+	updated, err := database.FindByTaskUUID(tdb.DB, "uuid-retry-test")
+	if err != nil {
+		t.Fatalf("find task: %v", err)
+	}
+	if updated.Status != database.StatusAIProcessing {
+		t.Errorf("expected AI_PROCESSING (waiting for callback), got %s", updated.Status)
+	}
+	if updated.AttemptOpenClaw != 3 {
+		t.Errorf("expected attempt_openclaw = 3, got %d", updated.AttemptOpenClaw)
+	}
+}
+
+// OpenClaw fail all 3 retries → FAILED with last_error.
+func TestDispatch_AllRetriesFailed(t *testing.T) {
+	tdb := database.NewTestDB(t)
+
+	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("server down"))
+	}))
+	defer mockServer.Close()
+
+	cfg := &config.Config{
+		OpenClawURL: mockServer.URL,
+		ListenAddr:  ":9999",
+	}
+
+	task := &database.Task{
+		TaskUUID:  "uuid-fail-all",
+		ThreadID:  "thread-1",
+		MessageID: "msg-fail@test.com",
+		Sender:    "user@test.com",
+		Subject:   "Fail test",
+		BodyPlain: "Hello",
+		Status:    database.StatusReceived,
+	}
+	if err := database.CreateTask(tdb.DB, task); err != nil {
+		t.Fatalf("create task: %v", err)
+	}
+
+	dispatcher := ai_client.NewDispatcher(cfg, tdb.DB)
+	dispatcher.Dispatch(task)
+
+	updated, err := database.FindByTaskUUID(tdb.DB, "uuid-fail-all")
+	if err != nil {
+		t.Fatalf("find task: %v", err)
+	}
+	if updated.Status != database.StatusFailed {
+		t.Errorf("expected FAILED, got %s", updated.Status)
+	}
+	if updated.LastError == nil {
+		t.Error("expected last_error to be set")
+	}
+	if updated.AttemptOpenClaw != 3 {
+		t.Errorf("expected attempt_openclaw = 3, got %d", updated.AttemptOpenClaw)
+	}
+}