package channelbridge

import (
	"context"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/session"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/loop"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/user"
)

// fakeAdapter is a minimal PlatformAdapter that records outbound sends so the
// bridge's reply path can be asserted without network I/O.
type fakeAdapter struct {
	name      string
	connected bool
	sends     []adapter.UnifiedMessage
	handler   adapter.MessageHandler
	sendErr   error
}

func (f *fakeAdapter) Name() string { return f.name }
func (f *fakeAdapter) Config() map[string]any {
	return map[string]any{"bot_token": "configured"}
}
func (f *fakeAdapter) Connect(context.Context) error { f.connected = true; return nil }
func (f *fakeAdapter) Disconnect(context.Context) error {
	f.connected = false
	return nil
}
func (f *fakeAdapter) IsConnected() bool                 { return f.connected }
func (f *fakeAdapter) HealthCheck(context.Context) error { return nil }
func (f *fakeAdapter) ReadMessages(ctx context.Context, _ func(adapter.UnifiedMessage)) {
	<-ctx.Done()
}
func (f *fakeAdapter) SendMessage(_ context.Context, resp adapter.UnifiedResponse) error {
	for _, m := range resp.Messages {
		f.sends = append(f.sends, m)
	}
	return f.sendErr
}
func (f *fakeAdapter) SendProactive(context.Context, adapter.UnifiedMessage) error { return nil }
func (f *fakeAdapter) SetMessageHandler(fn adapter.MessageHandler)                 { f.handler = fn }
func (f *fakeAdapter) Capabilities() adapter.Capabilities                          { return adapter.DefaultCapabilities() }
func (f *fakeAdapter) ListChannels(context.Context) ([]adapter.ChannelInfo, error) { return nil, nil }

// stubChatter records the session id and messages passed to the agent loop.
type stubChatter struct {
	sessionID string
	messages  []model.Message
	res       *loop.Result
	err       error
}

func (s *stubChatter) Run(_ context.Context, sessionID string, msgs []model.Message) (*loop.Result, error) {
	s.sessionID = sessionID
	s.messages = msgs
	return s.res, s.err
}

// stubSessions records the inbound message and returns a fixed session.
type stubSessions struct {
	msg   adapter.UnifiedMessage
	owner *user.OwnerProfile
	sess  session.Session
	err   error
}

func (s *stubSessions) GetOrCreate(_ context.Context, msg adapter.UnifiedMessage, owner *user.OwnerProfile) (session.Session, error) {
	s.msg = msg
	s.owner = owner
	if s.err != nil {
		return session.Session{}, s.err
	}
	return s.sess, nil
}

func directMessage() adapter.UnifiedMessage {
	return adapter.UnifiedMessage{
		Platform:    "telegram",
		ChannelID:   "100",
		ChannelType: adapter.ChannelDirect,
		SenderID:    "100",
		Content:     "hello",
		ContentType: adapter.ContentText,
	}
}

func newTestBridge(t *testing.T) (*Bridge, *stubChatter, *stubSessions, *fakeAdapter) {
	t.Helper()
	chat := &stubChatter{res: &loop.Result{Text: "hi back"}}
	sess := &stubSessions{sess: session.Session{SessionID: "sess-1", Owner: true, MemWritable: true}}
	ad := &fakeAdapter{name: "telegram"}

	b, err := New(Options{Loop: chat, Sessions: sess, Owner: &user.OwnerProfile{}})
	if err != nil {
		t.Fatalf("New: %v", err)
	}
	b.Add(ad)
	return b, chat, sess, ad
}

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

	b, chat, sess, ad := newTestBridge(t)
	ctx := context.Background()

	b.process(ctx, directMessage())

	if sess.msg.SenderID != "100" {
		t.Errorf("resolved sender = %q, want 100", sess.msg.SenderID)
	}
	if chat.sessionID != "sess-1" {
		t.Errorf("loop session id = %q, want sess-1", chat.sessionID)
	}
	if len(chat.messages) != 1 || chat.messages[0].Role != model.RoleUser {
		t.Fatalf("loop messages = %+v, want single user message", chat.messages)
	}
	if got := chat.messages[0].Content[0].Text; got != "hello" {
		t.Errorf("loop text = %q, want hello", got)
	}
	if len(ad.sends) != 1 {
		t.Fatalf("send count = %d, want 1", len(ad.sends))
	}
	reply := ad.sends[0]
	if reply.Content != "hi back" || reply.ContentType != adapter.ContentText {
		t.Errorf("reply = %+v, want text 'hi back'", reply)
	}
	if reply.ChannelID != "100" || reply.Platform != "telegram" {
		t.Errorf("reply target = %+v, want platform telegram channel 100", reply)
	}
}

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

	b, chat, _, ad := newTestBridge(t)
	msg := directMessage()
	msg.Content = "   "

	b.process(context.Background(), msg)

	if chat.sessionID != "" {
		t.Errorf("loop ran for empty content, session = %q", chat.sessionID)
	}
	if len(ad.sends) != 0 {
		t.Errorf("send count = %d, want 0 for empty content", len(ad.sends))
	}
}

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

	b, chat, _, ad := newTestBridge(t)
	chat.res = nil
	chat.err = context.DeadlineExceeded

	b.process(context.Background(), directMessage())

	if chat.sessionID != "sess-1" {
		t.Errorf("loop should still run for valid text, session = %q", chat.sessionID)
	}
	if len(ad.sends) != 0 {
		t.Errorf("send count = %d, want 0 on loop error", len(ad.sends))
	}
}

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

	b, chat, _, ad := newTestBridge(t)
	msg := adapter.UnifiedMessage{
		Platform:    "telegram",
		ChannelID:   "-20",
		ChannelType: adapter.ChannelGroup,
		GroupID:     "-20",
		GroupName:   "Gang",
		SenderID:    "9",
		Content:     "hello all",
		ContentType: adapter.ContentText,
	}
	chat.res = &loop.Result{Text: "group ack"}

	b.process(context.Background(), msg)

	if len(ad.sends) != 1 {
		t.Fatalf("send count = %d, want 1", len(ad.sends))
	}
	reply := ad.sends[0]
	if reply.ChannelType != adapter.ChannelGroup || reply.GroupID != "-20" {
		t.Errorf("group reply target = %+v, want group -20", reply)
	}
}

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

	b, chat, _, ad := newTestBridge(t)
	chat.res = &loop.Result{Text: "   "}

	b.process(context.Background(), directMessage())

	if len(ad.sends) != 0 {
		t.Errorf("send count = %d, want 0 for empty reply", len(ad.sends))
	}
}