package session

// 本文件钉住 keys.go 导出的两个派生：`ChannelKey` 与会话层内部 `channelID` 是**同一个**
// 实现，`Key` 与会话缓存键**逐字相同**。它们是「什么算同一个会话」的唯一定义 —— 车道
// （internal/services/channelbridge/lane.go）按会话串行就靠它，两处一旦分叉，同一个
// session 就会出现两条车道、两个回合并发（M22 复审 P1-1）。

import (
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
)

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

	cases := []struct {
		name string
		msg  adapter.UnifiedMessage
		want string
	}{
		{
			name: "群：按 group:<GroupID>，与频道无关",
			msg:  adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, ChannelID: "c1", GroupID: "g1"},
			want: "group:g1",
		},
		{
			name: "群：缺 GroupID 时退回 ChannelID",
			msg:  adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, ChannelID: "c1"},
			want: "c1",
		},
		{
			name: "私聊：按 ChannelID",
			msg:  adapter.UnifiedMessage{Platform: "telegram", ChannelType: adapter.ChannelDirect, ChannelID: "200", SenderID: "200"},
			want: "200",
		},
		{
			name: "私聊：缺 ChannelID 时退回 SenderID",
			msg:  adapter.UnifiedMessage{Platform: "telegram", ChannelType: adapter.ChannelDirect, SenderID: "200"},
			want: "200",
		},
		{
			name: "私聊：两者都缺 ⇒ 空（调用方据此以 ErrInvalidChannel 拒掉）",
			msg:  adapter.UnifiedMessage{Platform: "telegram", ChannelType: adapter.ChannelDirect},
			want: "",
		},
	}
	for _, c := range cases {
		c := c
		t.Run(c.name, func(t *testing.T) {
			t.Parallel()
			if got := ChannelKey(c.msg); got != c.want {
				t.Fatalf("ChannelKey = %q, want %q", got, c.want)
			}
		})
	}
}

// TestKeyIsTheSessionManagerCacheKey 钉住「导出的 Key 就是会话缓存键」：
// 形状 `platform \x00 channelID`（NUL 分隔，杜绝拼接歧义），且两维度都参与 ——
// 同平台不同渠道、不同平台同渠道都必须是**不同**的键。
func TestKeyIsTheSessionManagerCacheKey(t *testing.T) {
	t.Parallel()

	group1 := adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, ChannelID: "c1", GroupID: "g1"}
	group1OtherChannel := adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, ChannelID: "c2", GroupID: "g1"}
	group2 := adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, ChannelID: "c1", GroupID: "g2"}
	otherPlatform := adapter.UnifiedMessage{Platform: "qq-obv11", ChannelType: adapter.ChannelGroup, ChannelID: "c1", GroupID: "g1"}

	if got, want := Key(group1), "kook\x00group:g1"; got != want {
		t.Fatalf("Key = %q, want %q", got, want)
	}
	// 同一 guild 的两个 text channel 在会话层是**同一个**会话。
	if Key(group1) != Key(group1OtherChannel) {
		t.Fatalf("same guild channels must share one session key: %q vs %q", Key(group1), Key(group1OtherChannel))
	}
	// 不同群、不同平台必须是不同的会话。
	if Key(group1) == Key(group2) {
		t.Fatalf("different groups must not share a session key: %q", Key(group1))
	}
	if Key(group1) == Key(otherPlatform) {
		t.Fatalf("different platforms must not share a session key: %q", Key(group1))
	}
	// 渠道缺失时键仍非空，但 ChannelKey 能为空（调用方据此区分不可用渠道）。
	noChannel := adapter.UnifiedMessage{Platform: "telegram", ChannelType: adapter.ChannelDirect}
	if Key(noChannel) == "" || ChannelKey(noChannel) != "" {
		t.Fatalf("missing-channel case: Key=%q ChannelKey=%q", Key(noChannel), ChannelKey(noChannel))
	}
}