package channelbridge

import (
	"context"
	"errors"
	"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/user"
)

var errReload = errors.New("build failed")

// stubFactory 返回某平台的固定适配器集合，使重载测试
// 无需真实网络 I/O 即可驱动热替换。
type stubFactory struct {
	adpts []adapter.PlatformAdapter
	err   error
}

func (f *stubFactory) Build(_ string) ([]adapter.PlatformAdapter, error) { return f.adpts, f.err }

func newReloadBridge(t *testing.T, factory PlatformFactory) *Bridge {
	t.Helper()
	b, err := New(Options{
		Loop:     &stubChatter{res: &loop.Result{Text: "hi"}},
		Sessions: &stubSessions{sess: session.Session{SessionID: "s", Owner: true, MemWritable: true}},
		Owner:    &user.OwnerProfile{},
		Factory:  factory,
	})
	if err != nil {
		t.Fatalf("New: %v", err)
	}
	t.Cleanup(func() { b.Stop(context.Background()) })
	return b
}

func adapterIn(b *Bridge, name string) bool {
	for _, a := range b.snapshot() {
		if a.Name() == name {
			return true
		}
	}
	return false
}

func TestReloadReplacesAdapterWithNewConfig(t *testing.T) {
	t.Parallel()
	old := &fakeAdapter{name: "kook:conf0", cfg: map[string]any{"bot_token": "old"}}
	factory := &stubFactory{}
	b := newReloadBridge(t, factory)
	b.Add(old)
	b.Start()
	if !b.IsConnected("kook:conf0") {
		t.Fatal("expected old adapter connected after Start")
	}

	newConf0 := &fakeAdapter{name: "kook:conf0", cfg: map[string]any{"bot_token": "new"}}
	newConf1 := &fakeAdapter{name: "kook:conf1", cfg: map[string]any{"bot_token": "next"}}
	factory.adpts = []adapter.PlatformAdapter{newConf0, newConf1}

	if err := b.Reload("kook"); err != nil {
		t.Fatalf("Reload: %v", err)
	}

	// 新适配器已连接并注册。
	if !newConf0.IsConnected() || !newConf1.IsConnected() {
		t.Fatalf("new adapters not connected: conf0=%v conf1=%v", newConf0.IsConnected(), newConf1.IsConnected())
	}
	if !b.IsConnected("kook:conf0") || !b.IsConnected("kook:conf1") {
		t.Fatalf("bridge does not report new adapters connected")
	}
	// 旧适配器实例已断开（其读取循环已停止）。
	if old.IsConnected() {
		t.Fatal("old adapter should be disconnected after reload")
	}
}

func TestReloadRemovesRemovedAccount(t *testing.T) {
	t.Parallel()
	conf0 := &fakeAdapter{name: "kook:conf0", cfg: map[string]any{"bot_token": "t0"}}
	conf1 := &fakeAdapter{name: "kook:conf1", cfg: map[string]any{"bot_token": "t1"}}
	factory := &stubFactory{}
	b := newReloadBridge(t, factory)
	b.Add(conf0)
	b.Add(conf1)
	b.Start()

	// 新配置只保留 conf1（conf0 被删除）。
	factory.adpts = []adapter.PlatformAdapter{
		&fakeAdapter{name: "kook:conf1", cfg: map[string]any{"bot_token": "t1b"}},
	}
	if err := b.Reload("kook"); err != nil {
		t.Fatalf("Reload: %v", err)
	}
	if adapterIn(b, "kook:conf0") {
		t.Fatal("removed account's adapter should be dropped from the registry")
	}
	if !adapterIn(b, "kook:conf1") {
		t.Fatal("kept account's adapter should still be registered")
	}
	if !b.IsConnected("kook:conf1") {
		t.Fatal("kept account should be connected")
	}
}

func TestReloadOtherPlatformUntouched(t *testing.T) {
	t.Parallel()
	tg := &fakeAdapter{name: "telegram", cfg: map[string]any{"bot_token": "tg"}}
	kook := &fakeAdapter{name: "kook:conf0", cfg: map[string]any{"bot_token": "k"}}
	factory := &stubFactory{}
	b := newReloadBridge(t, factory)
	b.Add(tg)
	b.Add(kook)
	b.Start()

	factory.adpts = []adapter.PlatformAdapter{
		&fakeAdapter{name: "kook:conf0", cfg: map[string]any{"bot_token": "k2"}},
	}
	if err := b.Reload("kook"); err != nil {
		t.Fatalf("Reload: %v", err)
	}
	if !adapterIn(b, "telegram") || !tg.IsConnected() {
		t.Fatal("reloading kook should leave the telegram adapter untouched")
	}
}

func TestReloadNilFactoryErrors(t *testing.T) {
	t.Parallel()
	b := newReloadBridge(t, nil)
	if err := b.Reload("kook"); err != ErrNilFactory {
		t.Fatalf("err = %v, want ErrNilFactory", err)
	}
}

func TestReloadBeforeStartErrors(t *testing.T) {
	t.Parallel()
	b := newReloadBridge(t, &stubFactory{})
	if err := b.Reload("kook"); err != ErrBridgeClosed {
		t.Fatalf("err = %v, want ErrBridgeClosed (not started)", err)
	}
}

func TestReloadBuildError(t *testing.T) {
	t.Parallel()
	b := newReloadBridge(t, &stubFactory{err: errReload})
	if err := b.Reload("kook"); err == nil {
		t.Fatal("expected a build error to surface")
	}
}