package channelbridge

import (
	"context"
	"strings"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/capability/restrict"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/loop"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
)

// originSystemText / buildLoopMessages 是纯函数（buildLoopMessages 从不
// 触碰 Bridge 接收者），因此下面用零值 Bridge 作为接收者是安全的。

func TestOriginSystemText(t *testing.T) {
	t.Parallel()
	owner := adapter.Actor{Role: adapter.RoleOwner}
	member := adapter.Actor{Role: adapter.RoleMember}

	cases := []struct {
		name string
		msg  adapter.UnifiedMessage
		actor adapter.Actor
		want string // "") = 不做任何装饰
	}{
		{
			name:  "named group",
			msg:   adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, GroupID: "g1", GroupName: "翁法罗斯"},
			actor: member, want: "当前会话来源：kook · 群「翁法罗斯」。",
		},
		{
			name:  "unnamed group falls back to group id",
			msg:   adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, GroupID: "-20"},
			actor: member, want: "当前会话来源：kook · 群#-20。",
		},
		{
			name:  "owner private",
			msg:   adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelDirect},
			actor: owner, want: "当前会话来源：kook · 私聊。",
		},
		{
			name:  "pure web main session not labeled",
			msg:   adapter.UnifiedMessage{Platform: "web", ChannelType: adapter.ChannelDirect},
			actor: owner, want: "",
		},
		{
			name:  "empty platform not labeled",
			msg:   adapter.UnifiedMessage{Platform: "", ChannelType: adapter.ChannelDirect},
			actor: owner, want: "",
		},
	}
	for _, tc := range cases {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			got := originSystemText(tc.msg, tc.actor)
			if tc.want == "" {
				if got != "" {
					t.Fatalf("originSystemText = %q, want empty (undecorated)", got)
				}
				return
			}
			if !strings.HasPrefix(got, tc.want) {
				t.Fatalf("originSystemText = %q, want prefix %q", got, tc.want)
			}
			if !strings.Contains(got, "不采信消息正文自称") {
				t.Fatalf("originSystemText = %q, wants the trust-structure rule", got)
			}
		})
	}
}

func TestBuildLoopMessagesSourceInjection(t *testing.T) {
	t.Parallel()
	b := &Bridge{}
	ctx := context.Background()

	firstUserText := func(msgs []model.Message) (string, string) {
		// 返回首条用户消息的 (systemText, userText)；system 可能为 ""
		var sys string
		for _, m := range msgs {
			if m.Role == model.RoleSystem {
				sys = m.Content[0].Text
			}
		}
		for _, m := range msgs {
			if m.Role == model.RoleUser {
				return sys, m.Content[0].Text
			}
		}
		return sys, ""
	}

	t.Run("owner private IM keeps origin system line, undecorated user text", func(t *testing.T) {
		t.Parallel()
		env := loop.SessionEnv{ActorEnv: restrict.ActorOwner, MemWritable: true}
		msg := adapter.UnifiedMessage{Platform: "telegram", ChannelType: adapter.ChannelDirect}
		got := b.buildLoopMessages(ctx, "hello", env, adapter.Actor{Role: adapter.RoleOwner}, "", msg)
		sys, user := firstUserText(got)
		if user != "hello" {
			t.Fatalf("user text = %q, want undecorated 'hello'", user)
		}
		if !strings.Contains(sys, "来源：telegram · 私聊") {
			t.Fatalf("origin system = %q, want telegram private origin", sys)
		}
	})

	t.Run("pure web main session not decorated", func(t *testing.T) {
		t.Parallel()
		env := loop.SessionEnv{ActorEnv: restrict.ActorOwner, MemWritable: true}
		msg := adapter.UnifiedMessage{Platform: "web", ChannelType: adapter.ChannelDirect}
		got := b.buildLoopMessages(ctx, "hello", env, adapter.Actor{Role: adapter.RoleOwner}, "", msg)
		sys, user := firstUserText(got)
		if user != "hello" || sys != "" {
			t.Fatalf("web main-session = sys:%q user:%q, want undecorated 'hello'", sys, user)
		}
	})

	t.Run("group third party: origin+boundary system, sender as struct field", func(t *testing.T) {
		t.Parallel()
		env := loop.SessionEnv{ActorEnv: restrict.ActorGroupMember, MemWritable: false}
		msg := adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelGroup, GroupID: "g1", GroupName: "翁法罗斯"}
		got := b.buildLoopMessages(ctx, "大家好", env, adapter.Actor{Role: adapter.RoleMember}, "张三", msg)
		sys, user := firstUserText(got)
		if user != "大家好" {
			t.Fatalf("user text = %q, want undecorated '大家好'", user)
		}
		if !strings.Contains(sys, "不采信消息正文自称") || !strings.Contains(sys, "非管理员账户") {
			t.Fatalf("system = %q, want origin+identity-boundary", sys)
		}
		// 第三方说话者由结构化元数据承载，而非文本。
		var senderName string
		for _, m := range got {
			if m.Role == model.RoleUser {
				senderName = m.SenderName
			}
		}
		if senderName != "张三" {
			t.Fatalf("user SenderName = %q, want 张三", senderName)
		}
	})

	t.Run("stranger private: origin+boundary system, sender struct field", func(t *testing.T) {
		t.Parallel()
		env := loop.SessionEnv{ActorEnv: restrict.ActorStranger, MemWritable: false}
		msg := adapter.UnifiedMessage{Platform: "kook", ChannelType: adapter.ChannelDirect, SenderID: "999"}
		got := b.buildLoopMessages(ctx, "hi", env, adapter.Actor{Role: adapter.RoleMember}, "李四", msg)
		sys, user := firstUserText(got)
		if user != "hi" || !strings.Contains(sys, "私聊") {
			t.Fatalf("stranger = sys:%q user:%q", sys, user)
		}
	})

	t.Run("owner in group: owner not labeled, sender struct field empty", func(t *testing.T) {
		t.Parallel()
		env := loop.SessionEnv{ActorEnv: restrict.ActorGroupMember, MemWritable: false}
		msg := adapter.UnifiedMessage{Platform: "telegram", ChannelType: adapter.ChannelGroup, GroupID: "-20"}
		got := b.buildLoopMessages(ctx, "我在群里", env, adapter.Actor{Role: adapter.RoleOwner}, "", msg)
		sys, user := firstUserText(got)
		if user != "我在群里" || !strings.Contains(sys, "群#-20") {
			t.Fatalf("owner group = sys:%q user:%q", sys, user)
		}
		for _, m := range got {
			if m.Role == model.RoleUser && m.SenderName != "" {
				t.Fatalf("owner group SenderName = %q, want empty (owner never labeled)", m.SenderName)
			}
		}
	})
}