// This file is a Go text/template used by TestPluginRPCSharedChannelSync in
// channels/app/shared_channel_test.go. It is compiled into a real plugin binary
// at test time to exercise the full plugin RPC layer (gob serialization and
// MuxBroker streaming) for the ReceiveSharedChannel* plugin APIs.
// Template fields (e.g. {{.ChannelID}}) are populated by the test before compilation.

package main

import (
	"bytes"
	"fmt"
	"image"
	"image/color"
	"image/png"

	"github.com/mattermost/mattermost/server/public/model"
	"github.com/mattermost/mattermost/server/public/plugin"
)

type TestPlugin struct {
	plugin.MattermostPlugin
}

func (p *TestPlugin) OnActivate() error {
	channelID := "{{.ChannelID}}"
	remoteID := "{{.RemoteID}}"
	syncUserID := "{{.SyncUserID}}"
	syncPostID := "{{.SyncPostID}}"

	// --- Step 1: Sync a user + post via ReceiveSharedChannelSyncMsg ---
	msg := model.NewSyncMsg(channelID)
	msg.Users = map[string]*model.User{
		syncUserID: {
			Id:       syncUserID,
			Username: "rpc-synced-user",
			Email:    syncUserID + "@remote.test",
			RemoteId: model.NewPointer(remoteID),
		},
	}
	msg.Posts = []*model.Post{
		{
			Id:        syncPostID,
			ChannelId: channelID,
			UserId:    syncUserID,
			Message:   "hello from plugin over RPC",
			CreateAt:  model.GetMillis(),
			RemoteId:  model.NewPointer(remoteID),
		},
	}

	resp, err := p.API.ReceiveSharedChannelSyncMsg(remoteID, msg)
	if err != nil {
		return fmt.Errorf("ReceiveSharedChannelSyncMsg failed: %w", err)
	}
	if len(resp.UserErrors) > 0 {
		return fmt.Errorf("ReceiveSharedChannelSyncMsg had user errors: %v", resp.UserErrors)
	}
	if len(resp.PostErrors) > 0 {
		return fmt.Errorf("ReceiveSharedChannelSyncMsg had post errors: %v", resp.PostErrors)
	}

	// --- Step 2: Sync a file attachment via ReceiveSharedChannelAttachmentSyncMsg ---
	fileData := []byte("attachment data streamed over MuxBroker")
	fi := &model.FileInfo{
		CreatorId: syncUserID,
		Name:      "test.txt",
		Size:      int64(len(fileData)),
	}

	savedFI, err := p.API.ReceiveSharedChannelAttachmentSyncMsg(remoteID, channelID, fi, bytes.NewReader(fileData))
	if err != nil {
		return fmt.Errorf("ReceiveSharedChannelAttachmentSyncMsg failed: %w", err)
	}
	if savedFI == nil || savedFI.Id == "" {
		return fmt.Errorf("ReceiveSharedChannelAttachmentSyncMsg returned nil FileInfo")
	}

	// --- Step 3: Sync a profile image via ReceiveSharedChannelProfileImageSyncMsg ---
	img := image.NewRGBA(image.Rect(0, 0, 1, 1))
	img.Set(0, 0, color.White)
	var pngBuf bytes.Buffer
	if err := png.Encode(&pngBuf, img); err != nil {
		return fmt.Errorf("failed to encode test PNG: %w", err)
	}

	if err := p.API.ReceiveSharedChannelProfileImageSyncMsg(remoteID, syncUserID, pngBuf.Bytes()); err != nil {
		return fmt.Errorf("ReceiveSharedChannelProfileImageSyncMsg failed: %w", err)
	}

	return nil
}

func main() {
	plugin.ClientMain(&TestPlugin{})
}