package channelbridge

import (
	"context"
	"errors"
	"strings"
	"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/history"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/loop"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/user"
)

func newProactiveBridge(t *testing.T, owner *user.OwnerProfile, ads ...*fakeAdapter) *Bridge {
	t.Helper()
	return newProactiveBridgeHist(t, owner, nil, ads...)
}

// newProactiveBridgeHist is newProactiveBridge with a history store injected, so a
// test can supply a recent window for the "she was last active here" selection.
func newProactiveBridgeHist(t *testing.T, owner *user.OwnerProfile, hist history.HistoryStore, ads ...*fakeAdapter) *Bridge {
	t.Helper()
	chat := &stubChatter{res: &loop.Result{Text: "hi"}}
	sess := &stubSessions{sess: session.Session{SessionID: "sess-1", Owner: true, MemWritable: true}}
	b, err := New(Options{Loop: chat, Sessions: sess, Owner: owner, History: hist})
	if err != nil {
		t.Fatalf("new bridge: %v", err)
	}
	for _, ad := range ads {
		if ad != nil {
			b.Add(ad)
		}
	}
	return b
}

// proactiveMsg builds a minimal autonomous proactive message as backthink's
// buildProactiveMessage would for a no-channel decision (the generic sentinel).
func proactiveMsg(content string) adapter.UnifiedMessage {
	return adapter.UnifiedMessage{
		Platform:    "cyrene-backthink",
		ChannelType: adapter.ChannelDirect,
		Content:     content,
		ContentType: adapter.ContentText,
		Sender:      adapter.Actor{Role: adapter.RoleSystem, DisplayName: "Cyrene"},
	}
}

// TestBridge_SendProactive_OwnerChannel verifies a proactive push with no signal
// falls back to a whitelisted owner channel: the adapter for the owner's platform
// is selected and the owner account id is threaded as the DM peer.
func TestBridge_SendProactive_OwnerChannel(t *testing.T) {
	ad := &fakeAdapter{name: "telegram", connected: true}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{{Platform: "telegram", AccountID: "100"}}}
	b := newProactiveBridge(t, owner, ad)

	if err := b.SendProactive(context.Background(), proactiveMsg("记得喝水哦")); err != nil {
		t.Fatalf("SendProactive err = %v", err)
	}
	if len(ad.sends) != 1 {
		t.Fatalf("sends = %d, want 1", len(ad.sends))
	}
	got := ad.sends[0]
	if got.Platform != "telegram" {
		t.Fatalf("platform = %q, want telegram (owner account platform)", got.Platform)
	}
	if got.Content != "记得喝水哦" {
		t.Fatalf("content = %q, want the proactive text", got.Content)
	}
	if got.ChannelID != "100" || got.SenderID != "100" {
		t.Fatalf("peer = %q/%q, want the owner account id 100/100", got.ChannelID, got.SenderID)
	}
	if got.ChannelType != adapter.ChannelDirect {
		t.Fatalf("channel type = %q, want direct", got.ChannelType)
	}
}

// TestBridge_SendProactive_PlatformHintSelectsAccount verifies msg.Platform
// selects the matching owner account when one exists and is connected, rather
// than defaulting to another channel.
func TestBridge_SendProactive_PlatformHintSelectsAccount(t *testing.T) {
	ad := &fakeAdapter{name: "kook", connected: true}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{
		{Platform: "telegram", AccountID: "100"},
		{Platform: "kook", AccountID: "329284282"},
	}}
	b := newProactiveBridge(t, owner, ad)

	msg := proactiveMsg("洗完了")
	msg.Platform = "kook"
	if err := b.SendProactive(context.Background(), msg); err != nil {
		t.Fatalf("SendProactive err = %v", err)
	}
	if len(ad.sends) != 1 {
		t.Fatalf("sends = %d, want 1", len(ad.sends))
	}
	got := ad.sends[0]
	if got.Platform != "kook" || got.SenderID != "329284282" {
		t.Fatalf("target = %q/%q, want the kook owner account", got.Platform, got.SenderID)
	}
}

// TestBridge_SendProactive_DecisionHintPriority verifies a concrete [渠道:...]
// decision beats the recent-active platform: even though she last used WeChat, an
// explicit kook choice is honored (and still only one channel is used).
func TestBridge_SendProactive_DecisionHintPriority(t *testing.T) {
	kook := &fakeAdapter{name: "kook", connected: true}
	weixin := &fakeAdapter{name: "weixin-ilink", connected: true}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{
		{Platform: "telegram", AccountID: "100"},
		{Platform: "weixin-ilink", AccountID: "o9cq802QPKPscBenJAp-SMZPBlnQ@im.wechat"},
		{Platform: "kook", AccountID: "329284282"},
	}}
	hist := &contextHistory{recent: []history.Message{{Role: history.RoleUser, Platform: "weixin-ilink", Content: "hi", CreatedAt: 2}}}
	b := newProactiveBridgeHist(t, owner, hist, kook, weixin)

	msg := proactiveMsg("洗完了")
	msg.Platform = "kook"
	if err := b.SendProactive(context.Background(), msg); err != nil {
		t.Fatalf("SendProactive err = %v", err)
	}
	if len(kook.sends) != 1 {
		t.Fatalf("kook sends = %d, want 1 (explicit choice beats recent-active)", len(kook.sends))
	}
	if len(weixin.sends) != 0 {
		t.Fatalf("weixin sends = %d, want 0 (only one channel per push)", len(weixin.sends))
	}
	if kook.sends[0].Platform != "kook" || kook.sends[0].SenderID != "329284282" {
		t.Fatalf("target = %q/%q, want the kook owner account", kook.sends[0].Platform, kook.sends[0].SenderID)
	}
}

// TestBridge_SendProactive_RecentActivePlatform verifies a no-decision push lands
// on the channel she used most recently, skipping the web session (web is not a
// whitelisted IM account) and honoring a whitelisted, connected IM channel.
func TestBridge_SendProactive_RecentActivePlatform(t *testing.T) {
	kook := &fakeAdapter{name: "kook", connected: true}
	weixin := &fakeAdapter{name: "weixin-ilink", connected: true}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{
		{Platform: "kook", AccountID: "329284282"},
		{Platform: "weixin-ilink", AccountID: "o9cq802QPKPscBenJAp-SMZPBlnQ@im.wechat"},
	}}
	// Recent is oldest-first: the newest message is the web session, then WeChat,
	// then kook. The web session is skipped (not whitelisted), so the most recent
	// whitelisted, connected channel — WeChat — is chosen.
	hist := &contextHistory{recent: []history.Message{
		{Role: history.RoleUser, Platform: "kook", Content: "一早聊过", CreatedAt: 1},
		{Role: history.RoleUser, Platform: "weixin-ilink", Content: "微信聊的", CreatedAt: 2},
		{Role: history.RoleAssistant, Platform: "web", Content: "网页端", CreatedAt: 3},
	}}
	b := newProactiveBridgeHist(t, owner, hist, kook, weixin)

	if err := b.SendProactive(context.Background(), proactiveMsg("记得喝水哦")); err != nil {
		t.Fatalf("SendProactive err = %v", err)
	}
	if len(weixin.sends) != 1 {
		t.Fatalf("weixin sends = %d, want 1 (recent-active picks WeChat)", len(weixin.sends))
	}
	if len(kook.sends) != 0 {
		t.Fatalf("kook sends = %d, want 0", len(kook.sends))
	}
	if weixin.sends[0].Platform != "weixin-ilink" {
		t.Fatalf("platform = %q, want weixin-ilink", weixin.sends[0].Platform)
	}
}

// TestBridge_SendProactive_WeChatCanBeSelected verifies WeChat is a first-class
// proactive target: with a WeChat account whitelisted and its adapter connected, a
// no-signal push lands on it rather than always defaulting to kook.
func TestBridge_SendProactive_WeChatCanBeSelected(t *testing.T) {
	weixin := &fakeAdapter{name: "weixin-ilink", connected: true}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{{Platform: "weixin-ilink", AccountID: "o9cq802QPKPscBenJAp-SMZPBlnQ@im.wechat"}}}
	b := newProactiveBridge(t, owner, weixin)

	if err := b.SendProactive(context.Background(), proactiveMsg("记得喝水哦")); err != nil {
		t.Fatalf("SendProactive err = %v", err)
	}
	if len(weixin.sends) != 1 {
		t.Fatalf("sends = %d, want 1", len(weixin.sends))
	}
	if weixin.sends[0].Platform != "weixin-ilink" {
		t.Fatalf("platform = %q, want weixin-ilink", weixin.sends[0].Platform)
	}
	if weixin.sends[0].Content != "记得喝水哦" {
		t.Fatalf("content = %q, want the proactive text", weixin.sends[0].Content)
	}
}

// TestBridge_SendProactive_NoSignalFallbackRotates verifies the no-signal fallback
// rotates across connected whitelisted channels (instead of always kook), and that
// each push reaches exactly one channel.
func TestBridge_SendProactive_NoSignalFallbackRotates(t *testing.T) {
	kook := &fakeAdapter{name: "kook", connected: true}
	weixin := &fakeAdapter{name: "weixin-ilink", connected: true}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{
		{Platform: "kook", AccountID: "329284282"},
		{Platform: "weixin-ilink", AccountID: "o9cq802QPKPscBenJAp-SMZPBlnQ@im.wechat"},
	}}
	b := newProactiveBridge(t, owner, kook, weixin)

	if err := b.SendProactive(context.Background(), proactiveMsg("第一次")); err != nil {
		t.Fatalf("first SendProactive err = %v", err)
	}
	if err := b.SendProactive(context.Background(), proactiveMsg("第二次")); err != nil {
		t.Fatalf("second SendProactive err = %v", err)
	}

	if len(kook.sends) != 1 || len(weixin.sends) != 1 {
		t.Fatalf("sends = kook:%d weixin:%d, want 1 each (one channel per push, rotating)",
			len(kook.sends), len(weixin.sends))
	}
	if kook.sends[0].Content != "第一次" {
		t.Fatalf("kook content = %q, want '第一次'", kook.sends[0].Content)
	}
	if weixin.sends[0].Content != "第二次" {
		t.Fatalf("weixin content = %q, want '第二次'", weixin.sends[0].Content)
	}
}

// TestBridge_SendProactive_HintNotWhitelisted_FallsBackToWeChat verifies a concrete
// decision channel that is NOT whitelisted degrades to a whitelisted, connected
// owner channel rather than erroring or landing on a non-owner channel. This is
// how WeChat becomes reachable even though the old default never considered it.
func TestBridge_SendProactive_HintNotWhitelisted_FallsBackToWeChat(t *testing.T) {
	weixin := &fakeAdapter{name: "weixin-ilink", connected: true}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{{Platform: "weixin-ilink", AccountID: "o9cq802QPKPscBenJAp-SMZPBlnQ@im.wechat"}}}
	b := newProactiveBridge(t, owner, weixin)

	msg := proactiveMsg("记得喝水哦")
	msg.Platform = "kook" // kook is not whitelisted for this owner
	if err := b.SendProactive(context.Background(), msg); err != nil {
		t.Fatalf("SendProactive err = %v (a non-whitelisted hint should fall back, not error)", err)
	}
	if len(weixin.sends) != 1 {
		t.Fatalf("sends = %d, want 1 (fell back to the whitelisted WeChat channel)", len(weixin.sends))
	}
	if weixin.sends[0].Platform != "weixin-ilink" {
		t.Fatalf("platform = %q, want weixin-ilink", weixin.sends[0].Platform)
	}
}

// TestBridge_SendProactive_NoOwnerChannel verifies a clear error when the owner
// profile has no whitelisted account, so the caller records the reason.
func TestBridge_SendProactive_NoOwnerChannel(t *testing.T) {
	b := newProactiveBridge(t, &user.OwnerProfile{})

	err := b.SendProactive(context.Background(), proactiveMsg("hi"))
	if err == nil {
		t.Fatalf("expected an error for a missing owner channel, got nil")
	}
	if !strings.Contains(err.Error(), "no connected owner IM channel") {
		t.Fatalf("error = %q, want a 'no connected owner IM channel' note", err)
	}
}

// TestBridge_SendProactive_NoAdapter verifies the error when the owner has a
// whitelisted channel but no adapter is registered/connected for it.
func TestBridge_SendProactive_NoAdapter(t *testing.T) {
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{{Platform: "kook", AccountID: "329284282"}}}
	b := newProactiveBridge(t, owner)

	err := b.SendProactive(context.Background(), proactiveMsg("hi"))
	if err == nil {
		t.Fatalf("expected an error for a missing adapter, got nil")
	}
	if !strings.Contains(err.Error(), "no connected owner IM channel") {
		t.Fatalf("error = %q, want a 'no connected owner IM channel' note", err)
	}
}

// TestBridge_SendProactive_AdapterError verifies an adapter send failure surfaces
// as a wrapped error with the platform (so the record/detail is honest).
func TestBridge_SendProactive_AdapterError(t *testing.T) {
	ad := &fakeAdapter{name: "kook", connected: true, sendErr: errors.New("kook disconnected")}
	owner := &user.OwnerProfile{Accounts: []user.OwnerAccount{{Platform: "kook", AccountID: "329284282"}}}
	b := newProactiveBridge(t, owner, ad)

	err := b.SendProactive(context.Background(), proactiveMsg("hi"))
	if err == nil {
		t.Fatalf("expected an error, got nil")
	}
	if !strings.Contains(err.Error(), "kook") || !strings.Contains(err.Error(), "kook disconnected") {
		t.Fatalf("error = %q, want it to wrap the adapter error and name the platform", err)
	}
}