import {
    Client,
    GatewayIntentBits,
    Events,
    Interaction,
    ChatInputCommandInteraction,
    MessageFlags,
    Activity,
    ActivityType
} from "discord.js";
import Commands from "./Commands/Commands";
import {Container} from "../Container/Container";
import {Logger} from "log4js";
import {UserError} from "./UserError";

export class DiscordClient {
    private readonly client: Client;
    private commands: Commands;
    
    public get Client (): Client {
        return this.client;
    }
    
    constructor() {
        this.client = new Client({
            intents: [GatewayIntentBits.Guilds]
        })
        
        this.commands = new Commands();
    }
    
    applyEvents() {
        this.client.once(Events.ClientReady, () => {
            Container.get<Logger>("logger").info(`Ready! Logged in as ${this.client.user.tag}`);
            this.client.user.setActivity('your PnP playdates', {
                type: ActivityType.Watching,
            });
        })
        
        this.client.on(Events.InteractionCreate, async (interaction: Interaction) => {
            const method = this.findCommandMethod(interaction);
            if (!method) {
                Container.get<Logger>("logger").error(`Could not find method for '${interaction.commandName}'`);
                return;
            }
            
            await method();
        })
    }
    
    connect(token: string) {
        this.client.login(token);
    }
    
    private findCommandMethod(interaction: Interaction) {
        if (interaction.isChatInputCommand()) {
            const command = this.commands.getCommand(interaction.commandName);
            
            if (!command) {
                return null;
            }
            
            if (!('execute' in command)) {
                return null;
            }
            
            return async () => {
                Container.get<Logger>("logger").debug(`Found chat command ${interaction.commandName}: running...`);
                
                try {
                    await command.execute(interaction)
                }
                catch (e: any) {
                    Container.get<Logger>("logger").error(e)
                    
                    let userMessage = ":x: There was an error while executing this command!";
                    if (e.constructor.name === UserError.name) {
                        userMessage = `:x: \`${e.message}\` - Please validate your request!`
                    }
                    if (interaction.replied || interaction.deferred) {
                        await interaction.followUp({ content: userMessage, flags: MessageFlags.Ephemeral });
                    } else {
                        await interaction.reply({ content: userMessage, flags: MessageFlags.Ephemeral });
                    }
                }
            }
        }
        
        if (interaction.isAutocomplete()) {
            const command = this.commands.getCommand(interaction.commandName);

            if (!command) {
                return null;
            }

            if (!('handleAutocomplete' in command)) {
                return null;
            }
            
            return async () => {
                Container.get<Logger>("logger").debug(`Found command ${interaction.commandName} for autocomplete: handling...`);
                
                try {
                    await command.handleAutocomplete(interaction);
                } catch (e: any) {
                    Container.get<Logger>('logger').error(e);
                }
            }
        }
        
        return null;
    }
}