package main

import (
	"encoding/json"
	"fmt"
	"os/exec"
	"strings"
	"sync"

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

// Plugin implements the interface expected by the Mattermost server to communicate between the server and plugin processes.
type Plugin struct {
	plugin.MattermostPlugin

	// configurationLock synchronizes access to the configuration.
	configurationLock sync.RWMutex

	// configuration is the active plugin configuration. Consult getConfiguration and
	// setConfiguration for usage.
	configuration *configuration
}

// Known game processes
var knownGames = map[string]bool{
	"fortnite.exe": true,
	"gameprocess":  true,
	// Add more known game processes here
}

// GetActiveGame scans processes to determine the active game based on known game names
func (p *Plugin) GetActiveGame() (string, error) {
	// Use appropriate command for your OS
	cmd := exec.Command("ps", "-e")
	output, err := cmd.Output()
	if err != nil {
		return "", err
	}

	lines := strings.Split(string(output), "\n")
	for _, line := range lines {
		for gameName := range knownGames {
			if strings.Contains(line, gameName) {
				return gameName, nil
			}
		}
	}

	return "No game detected", nil
}

func (p *Plugin) ExecuteCommand(c *plugin.Context, command *model.CommandArgs) (*model.CommandResponse, *model.AppError) {
	split := strings.Fields(command.Command)

	if len(split) == 0 {
		return &model.CommandResponse{}, nil
	}

	switch split[0] {
	case "/setgame":
		var game string
		var err error
		if len(split) < 2 {
			// Scan for active game if no specific game is mentioned
			game, err = p.GetActiveGame()
			if err != nil {
				return nil, &model.AppError{Message: "Failed to scan processes", StatusCode: 500}
			}
		} else {
			game = strings.Join(split[1:], " ")
		}

		status := fmt.Sprintf("Playing: %s", game)
		user, appErr := p.API.GetUser(command.UserId)
		if appErr != nil {
			return nil, appErr
		}

		// Serialize the custom status to JSON
		customStatus := model.CustomStatus{
			Emoji:    "video_game",
			Text:     status,
			Duration: "0", // Optional: Time duration the status will stay
		}
		customStatusJSON, err := json.Marshal(customStatus)
		if err != nil {
			return nil, &model.AppError{Message: "Failed to serialize custom status", StatusCode: 500}
		}

		// Set the custom status in user.Props
		user.Props = map[string]string{
			"custom_status": string(customStatusJSON),
		}

		if _, appErr := p.API.UpdateUser(user); appErr != nil {
			return nil, appErr
		}

		return &model.CommandResponse{
			Text: fmt.Sprintf("Your status has been updated to: %s", status),
		}, nil
	default:
		return &model.CommandResponse{}, nil
	}
}

func (p *Plugin) OnActivate() error {
	command := &model.Command{
		Trigger:          "setgame",
		AutoComplete:     true,
		AutoCompleteDesc: "Set the game you are currently playing",
		AutoCompleteHint: "[game]",
	}

	if err := p.API.RegisterCommand(command); err != nil {
		return err
	}

	return nil
}