package rpc

import (
	"context"
	"github.com/gotd/td/bin"
	"github.com/gotd/td/clock"
	"github.com/gotd/td/tg"
	"go.uber.org/zap/zaptest"
	appchannels "telesrv/internal/app/channels"
	appdialogs "telesrv/internal/app/dialogs"
	appusers "telesrv/internal/app/users"
	"telesrv/internal/domain"
	"telesrv/internal/store/memory"
	"testing"
)

func TestPublicChannelPreviewRPCsAllowNonMember(t *testing.T) {
	ctx := context.Background()
	userStore := memory.NewUserStore()
	owner, _ := userStore.Create(ctx, domain.User{AccessHash: 92001, Phone: "15550092001", FirstName: "Owner"})
	viewer, _ := userStore.Create(ctx, domain.User{AccessHash: 92002, Phone: "15550092002", FirstName: "Viewer"})
	channelStore := memory.NewChannelStore()
	channelService := appchannels.NewService(channelStore)
	dialogService := appdialogs.NewService(memory.NewDialogStore(), channelStore)
	r := New(Config{}, Deps{
		Users:    appusers.NewService(userStore),
		Channels: channelService,
		Dialogs:  dialogService,
	}, zaptest.NewLogger(t), clock.System)
	public, err := channelService.CreateChannel(ctx, owner.ID, domain.CreateChannelRequest{
		Title:     "Public Preview RPC",
		Broadcast: true,
		Date:      1700010100,
	})
	if err != nil {
		t.Fatalf("create public channel: %v", err)
	}
	if _, err := channelService.UpdateUsername(ctx, owner.ID, domain.UpdateChannelUsernameRequest{
		UserID:    owner.ID,
		ChannelID: public.Channel.ID,
		Username:  "public_preview_rpc",
	}); err != nil {
		t.Fatalf("publish channel username: %v", err)
	}
	sent, err := channelService.SendMessage(ctx, owner.ID, domain.SendChannelMessageRequest{
		ChannelID: public.Channel.ID,
		RandomID:  201,
		Message:   "public preview rpc post",
		Date:      1700010110,
	})
	if err != nil {
		t.Fatalf("send public post: %v", err)
	}
	input := &tg.InputChannel{ChannelID: public.Channel.ID, AccessHash: public.Channel.AccessHash}
	peer := &tg.InputPeerChannel{ChannelID: public.Channel.ID, AccessHash: public.Channel.AccessHash}

	full, err := r.onChannelsGetFullChannel(WithUserID(ctx, viewer.ID), input)
	if err != nil {
		t.Fatalf("non-member getFullChannel public preview: %v", err)
	}
	if len(full.Chats) != 1 {
		t.Fatalf("full chats = %d, want one channel", len(full.Chats))
	}
	chat, ok := full.Chats[0].(*tg.Channel)
	if !ok || !chat.Left || chat.ID != public.Channel.ID {
		t.Fatalf("full channel chat = %T %+v, want left public channel", full.Chats[0], full.Chats[0])
	}
	channelFull, ok := full.FullChat.(*tg.ChannelFull)
	if !ok || channelFull.ID != public.Channel.ID || channelFull.UnreadCount != 0 {
		t.Fatalf("full chat = %T %+v, want channel full without unread", full.FullChat, full.FullChat)
	}

	chats, err := r.onChannelsGetChannels(WithUserID(ctx, viewer.ID), []tg.InputChannelClass{input})
	if err != nil {
		t.Fatalf("non-member getChannels public preview: %v", err)
	}
	if len(chats.(*tg.MessagesChats).Chats) != 1 {
		t.Fatalf("getChannels chats = %d, want one public preview channel", len(chats.(*tg.MessagesChats).Chats))
	}
	listed, ok := chats.(*tg.MessagesChats).Chats[0].(*tg.Channel)
	if !ok || !listed.Left || listed.ID != public.Channel.ID {
		t.Fatalf("getChannels chat = %T %+v, want left public channel", chats.(*tg.MessagesChats).Chats[0], chats.(*tg.MessagesChats).Chats[0])
	}

	sendAs, err := r.onChannelsGetSendAs(WithUserID(ctx, viewer.ID), &tg.ChannelsGetSendAsRequest{Peer: peer})
	if err != nil {
		t.Fatalf("non-member getSendAs public preview: %v", err)
	}
	if len(sendAs.Peers) != 1 {
		t.Fatalf("sendAs peers = %+v, want only current user peer", sendAs.Peers)
	}
	if len(sendAs.Chats) != 1 {
		t.Fatalf("sendAs chats = %d, want public channel chat", len(sendAs.Chats))
	}

	historyReq := &tg.MessagesGetHistoryRequest{Peer: peer, Limit: 10}
	var in bin.Buffer
	if err := historyReq.Encode(&in); err != nil {
		t.Fatalf("encode getHistory: %v", err)
	}
	enc, err := r.Dispatch(WithUserID(ctx, viewer.ID), [8]byte{}, 0, &in)
	if err != nil {
		t.Fatalf("dispatch getHistory public preview: %v", err)
	}
	box, ok := enc.(*tg.MessagesMessagesBox)
	if !ok {
		t.Fatalf("getHistory response = %T, want boxed messages", enc)
	}
	history, ok := box.Messages.(*tg.MessagesChannelMessages)
	if !ok {
		t.Fatalf("boxed getHistory = %T, want channel messages", box.Messages)
	}
	foundPost := false
	for _, item := range history.Messages {
		if msg, ok := item.(*tg.Message); ok && msg.Message == "public preview rpc post" {
			foundPost = true
		}
	}
	if !foundPost {
		t.Fatalf("history messages = %+v, want public preview post", history.Messages)
	}
	if len(history.Chats) != 1 {
		t.Fatalf("history chats = %d, want public channel chat", len(history.Chats))
	}
	historyChat, ok := history.Chats[0].(*tg.Channel)
	if !ok || !historyChat.Left || historyChat.ID != public.Channel.ID {
		t.Fatalf("history chat = %T %+v, want left public channel", history.Chats[0], history.Chats[0])
	}

	diff, err := r.onUpdatesGetChannelDifference(WithUserID(ctx, viewer.ID), &tg.UpdatesGetChannelDifferenceRequest{
		Channel: input,
		Pts:     public.Event.Pts,
		Limit:   10,
	})
	if err != nil {
		t.Fatalf("non-member getChannelDifference public preview: %v", err)
	}
	fullDiff, ok := diff.(*tg.UpdatesChannelDifference)
	if !ok || !fullDiff.Final || fullDiff.Pts != sent.Event.Pts || len(fullDiff.NewMessages) != 1 {
		t.Fatalf("channel difference = %T %+v, want one public preview message at current pts", diff, diff)
	}
	diffMsg, ok := fullDiff.NewMessages[0].(*tg.Message)
	if !ok || diffMsg.Message != "public preview rpc post" {
		t.Fatalf("channel difference message = %T %+v, want public preview rpc post", fullDiff.NewMessages[0], fullDiff.NewMessages[0])
	}
	if len(fullDiff.Chats) != 1 {
		t.Fatalf("channel difference chats = %d, want public channel chat", len(fullDiff.Chats))
	}
	diffChat, ok := fullDiff.Chats[0].(*tg.Channel)
	if !ok || !diffChat.Left || diffChat.ID != public.Channel.ID {
		t.Fatalf("channel difference chat = %T %+v, want left public channel", fullDiff.Chats[0], fullDiff.Chats[0])
	}

	domainPeers, err := r.dialogPeersFromInput(WithUserID(ctx, viewer.ID), viewer.ID, []tg.InputDialogPeerClass{&tg.InputDialogPeer{Peer: peer}})
	if err != nil {
		t.Fatalf("dialog peer conversion public preview: %v", err)
	}
	if len(domainPeers) != 1 || domainPeers[0].Type != domain.PeerTypeChannel || domainPeers[0].ID != public.Channel.ID {
		t.Fatalf("domain peers = %+v, want public channel peer", domainPeers)
	}
	directPeerDialogs, err := dialogService.GetPeerDialogs(ctx, viewer.ID, domainPeers)
	if err != nil {
		t.Fatalf("dialog service public preview: %v", err)
	}
	if len(directPeerDialogs.Dialogs) != 1 || len(directPeerDialogs.ChannelMessages) != 1 || len(directPeerDialogs.Channels) != 1 {
		t.Fatalf("direct peer dialogs = %+v, want one dialog/message/channel", directPeerDialogs)
	}

	peerDialogsReq := &tg.MessagesGetPeerDialogsRequest{
		Peers: []tg.InputDialogPeerClass{&tg.InputDialogPeer{Peer: peer}},
	}
	var peerDialogsIn bin.Buffer
	if err := peerDialogsReq.Encode(&peerDialogsIn); err != nil {
		t.Fatalf("encode getPeerDialogs: %v", err)
	}
	peerDialogsEnc, err := r.Dispatch(WithUserID(ctx, viewer.ID), [8]byte{}, 0, &peerDialogsIn)
	if err != nil {
		t.Fatalf("dispatch getPeerDialogs public preview: %v", err)
	}
	peerDialogs, ok := peerDialogsEnc.(*tg.MessagesPeerDialogs)
	if !ok {
		t.Fatalf("getPeerDialogs response = %T, want peer dialogs", peerDialogsEnc)
	}
	if len(peerDialogs.Dialogs) != 1 || len(peerDialogs.Messages) != 1 || len(peerDialogs.Chats) != 1 {
		t.Fatalf("peer dialogs = %+v, want one dialog/message/channel", peerDialogs)
	}
	tgDialog, ok := peerDialogs.Dialogs[0].(*tg.Dialog)
	if !ok || tgDialog.TopMessage <= 0 || tgDialog.UnreadCount != 0 {
		t.Fatalf("peer dialog = %T %+v, want read-only public preview dialog", peerDialogs.Dialogs[0], peerDialogs.Dialogs[0])
	}
	tgMessage, ok := peerDialogs.Messages[0].(*tg.Message)
	if !ok || tgMessage.Message != "public preview rpc post" {
		t.Fatalf("peer dialog message = %T %+v, want public preview rpc post", peerDialogs.Messages[0], peerDialogs.Messages[0])
	}
	peerDialogChat, ok := peerDialogs.Chats[0].(*tg.Channel)
	if !ok || !peerDialogChat.Left || peerDialogChat.ID != public.Channel.ID {
		t.Fatalf("peer dialog chat = %T %+v, want left public channel", peerDialogs.Chats[0], peerDialogs.Chats[0])
	}
}