import Discord, { CommandInteraction, GuildChannel, GuildMember, TextChannel } from "discord.js";
import { SlashCommandSubcommandBuilder } from "@discordjs/builders";
import confirmationMessage from "../../utils/confirmationMessage.js";
import EmojiEmbed from "../../utils/generateEmojiEmbed.js";
import keyValueList from "../../utils/generateKeyValueList.js";
import getEmojiByName from "../../utils/getEmojiByName.js";
import client from "../../utils/client.js";

const command = (builder: SlashCommandSubcommandBuilder) =>
    builder
        .setName("purge")
        .setDescription("Bulk deletes messages in a channel")
        .addIntegerOption(option => option
            .setName("amount")
            .setDescription("The amount of messages to delete")
            .setRequired(false)
            .setMinValue(1)
            .setMaxValue(100))
        .addUserOption(option => option.setName("user").setDescription("The user to purge messages from").setRequired(false))
        .addStringOption(option => option.setName("reason").setDescription("The reason for the purge").setRequired(false));

const callback = async (interaction: CommandInteraction): Promise<void | unknown> => {
    const user = interaction.options.getMember("user") as GuildMember ?? null;
    const channel = (interaction.channel as GuildChannel);
    if (!(["GUILD_TEXT", "GUILD_NEWS", "GUILD_NEWS_THREAD", "GUILD_PUBLIC_THREAD", "GUILD_PRIVATE_THREAD"].includes(channel.type.toString()))) {
        return await interaction.reply({
            embeds: [
                new EmojiEmbed()
                    .setEmoji("CHANNEL.PURGE.RED")
                    .setTitle("Purge")
                    .setDescription("You cannot purge this channel")
                    .setStatus("Danger")
            ],
            components: [],
            ephemeral: true
        });
    }
    // TODO:[Modals] Replace this with a modal
    if ( !interaction.options.getInteger("amount") ) {
        await interaction.reply({
            embeds: [
                new EmojiEmbed()
                    .setEmoji("CHANNEL.PURGE.RED")
                    .setTitle("Purge")
                    .setDescription("Select how many messages to delete")
                    .setStatus("Danger")
            ],
            components: [],
            ephemeral: true,
            fetchReply: true
        });
        let deleted = [] as Discord.Message[];
        while (true) {
            const m = await interaction.editReply({
                embeds: [
                    new EmojiEmbed()
                        .setEmoji("CHANNEL.PURGE.RED")
                        .setTitle("Purge")
                        .setDescription("Select how many messages to delete. You can continue clicking until all messages are cleared.")
                        .setStatus("Danger")
                ],
                components: [
                    new Discord.MessageActionRow().addComponents([
                        new Discord.MessageButton()
                            .setCustomId("1")
                            .setLabel("1")
                            .setStyle("SECONDARY"),
                        new Discord.MessageButton()
                            .setCustomId("3")
                            .setLabel("3")
                            .setStyle("SECONDARY"),
                        new Discord.MessageButton()
                            .setCustomId("5")
                            .setLabel("5")
                            .setStyle("SECONDARY")
                    ]),
                    new Discord.MessageActionRow().addComponents([
                        new Discord.MessageButton()
                            .setCustomId("10")
                            .setLabel("10")
                            .setStyle("SECONDARY"),
                        new Discord.MessageButton()
                            .setCustomId("25")
                            .setLabel("25")
                            .setStyle("SECONDARY"),
                        new Discord.MessageButton()
                            .setCustomId("50")
                            .setLabel("50")
                            .setStyle("SECONDARY")
                    ]),
                    new Discord.MessageActionRow().addComponents([
                        new Discord.MessageButton()
                            .setCustomId("done")
                            .setLabel("Done")
                            .setStyle("SUCCESS")
                            .setEmoji(getEmojiByName("CONTROL.TICK", "id"))
                    ])
                ]
            }) as Discord.Message;
            let component;
            try {
                component = m.awaitMessageComponent({filter: (m) => m.user.id === interaction.user.id, time: 300000});
            } catch (e) { break; }
            component.deferUpdate();
            if (component.customId === "done") break;
            let amount;
            try { amount = parseInt(component.customId); } catch { break; }
            let messages;
            await (interaction.channel as TextChannel).messages.fetch({limit: amount}).then(async (ms) => {
                if (user) {
                    ms = ms.filter(m => m.author.id === user.id);
                }
                messages = await (channel as TextChannel).bulkDelete(ms, true);
            });
            if (messages) {
                deleted = deleted.concat(messages.map(m => m));
            }
        }
        if (deleted.length === 0) return await interaction.editReply({
            embeds: [
                new EmojiEmbed()
                    .setEmoji("CHANNEL.PURGE.RED")
                    .setTitle("Purge")
                    .setDescription("No messages were deleted")
                    .setStatus("Danger")
            ],
            components: []
        });
        if (user) {
            await client.database.history.create("purge", interaction.guild.id, user, interaction.options.getString("reason"), null, null, deleted.length);
        }
        const { log, NucleusColors, entry, renderUser, renderChannel } = client.logger;
        const data = {
            meta: {
                type: "channelPurge",
                displayName: "Channel Purged",
                calculateType: "messageDelete",
                color: NucleusColors.red,
                emoji: "PUNISH.BAN.RED",
                timestamp: new Date().getTime()
            },
            list: {
                memberId: entry(interaction.user.id, `\`${interaction.user.id}\``),
                purgedBy: entry(interaction.user.id, renderUser(interaction.user)),
                channel: entry(interaction.channel.id, renderChannel(interaction.channel)),
                messagesCleared: entry(deleted.length, deleted.length)
            },
            hidden: {
                guild: interaction.guild.id
            }
        };
        log(data);
        let out = "";
        deleted.reverse().forEach(message => {
            out += `${message.author.username}#${message.author.discriminator} (${message.author.id}) [${new Date(message.createdTimestamp).toISOString()}]\n`;
            const lines = message.content.split("\n");
            lines.forEach(line => {out += `> ${line}\n`;});
            out += "\n\n";
        });
        const attachmentObject = {
            attachment: Buffer.from(out),
            name: `purge-${channel.id}-${Date.now()}.txt`,
            description: "Purge log"
        };
        const m = await interaction.editReply({embeds: [new EmojiEmbed()
            .setEmoji("CHANNEL.PURGE.GREEN")
            .setTitle("Purge")
            .setDescription("Messages cleared")
            .setStatus("Success")
        ], components: [new Discord.MessageActionRow().addComponents([
            new Discord.MessageButton()
                .setCustomId("download")
                .setLabel("Download transcript")
                .setStyle("SUCCESS")
                .setEmoji(getEmojiByName("CONTROL.DOWNLOAD", "id"))
        ])]}) as Discord.Message;
        let component;
        try {
            component = await m.awaitMessageComponent({filter: (m) => m.user.id === interaction.user.id, time: 300000});
        } catch { return; }
        if (component && component.customId === "download") {
            interaction.editReply({embeds: [new EmojiEmbed()
                .setEmoji("CHANNEL.PURGE.GREEN")
                .setTitle("Purge")
                .setDescription("Uploaded")
                .setStatus("Success")
            ], components: [], files: [attachmentObject]});
        } else {
            interaction.editReply({embeds: [new EmojiEmbed()
                .setEmoji("CHANNEL.PURGE.GREEN")
                .setTitle("Purge")
                .setDescription("Messages cleared")
                .setStatus("Success")
            ], components: []});
        }
        return;
    } else {
        const confirmation = await new confirmationMessage(interaction)
            .setEmoji("CHANNEL.PURGE.RED")
            .setTitle("Purge")
            .setDescription(keyValueList({
                "channel": `<#${channel.id}>`,
                "amount": interaction.options.getInteger("amount").toString(),
                "reason": `\n> ${interaction.options.getString("reason") ? interaction.options.getString("reason") : "*No reason provided*"}`
            }))
            .setColor("Danger")
            .send();
        if (confirmation.cancelled) return;
        if (confirmation.success) {
            let messages;
            try {
                if (!user) {
                    const toDelete = await (interaction.channel as TextChannel).messages.fetch({limit: interaction.options.getInteger("amount")});
                    messages = await (channel as TextChannel).bulkDelete(toDelete, true);
                } else {
                    const toDelete = (await (await (interaction.channel as TextChannel).messages.fetch({limit: 100}))
                        .filter(m => m.author.id === user.id)).first(interaction.options.getInteger("amount"));
                    messages = await (channel as TextChannel).bulkDelete(toDelete, true);
                }
            } catch(e) {
                await interaction.editReply({embeds: [new EmojiEmbed()
                    .setEmoji("CHANNEL.PURGE.RED")
                    .setTitle("Purge")
                    .setDescription("Something went wrong and no messages were deleted")
                    .setStatus("Danger")
                ], components: []});
            }
            if (user) {
                await client.database.history.create("purge", interaction.guild.id, user, interaction.options.getString("reason"), null, null, messages.size);
            }
            const { log, NucleusColors, entry, renderUser, renderChannel } = client.logger;
            const data = {
                meta: {
                    type: "channelPurge",
                    displayName: "Channel Purged",
                    calculateType: "messageDelete",
                    color: NucleusColors.red,
                    emoji: "PUNISH.BAN.RED",
                    timestamp: new Date().getTime()
                },
                list: {
                    memberId: entry(interaction.user.id, `\`${interaction.user.id}\``),
                    purgedBy: entry(interaction.user.id, renderUser(interaction.user)),
                    channel: entry(interaction.channel.id, renderChannel(interaction.channel)),
                    messagesCleared: entry(messages.size, messages.size)
                },
                hidden: {
                    guild: interaction.guild.id
                }
            };
            log(data);
            let out = "";
            messages.reverse().forEach(message => {
                out += `${message.author.username}#${message.author.discriminator} (${message.author.id}) [${new Date(message.createdTimestamp).toISOString()}]\n`;
                const lines = message.content.split("\n");
                lines.forEach(line => {out += `> ${line}\n`;});
                out += "\n\n";
            });
            const attachmentObject = {
                attachment: Buffer.from(out),
                name: `purge-${channel.id}-${Date.now()}.txt`,
                description: "Purge log"
            };
            const m = await interaction.editReply({embeds: [new EmojiEmbed()
                .setEmoji("CHANNEL.PURGE.GREEN")
                .setTitle("Purge")
                .setDescription("Messages cleared")
                .setStatus("Success")
            ], components: [new Discord.MessageActionRow().addComponents([
                new Discord.MessageButton()
                    .setCustomId("download")
                    .setLabel("Download transcript")
                    .setStyle("SUCCESS")
                    .setEmoji(getEmojiByName("CONTROL.DOWNLOAD", "id"))
            ])]}) as Discord.Message;
            let component;
            try {
                component = await m.awaitMessageComponent({filter: (m) => m.user.id === interaction.user.id, time: 300000});
            } catch { return; }
            if (component && component.customId === "download") {
                interaction.editReply({embeds: [new EmojiEmbed()
                    .setEmoji("CHANNEL.PURGE.GREEN")
                    .setTitle("Purge")
                    .setDescription("Transcript uploaded above")
                    .setStatus("Success")
                ], components: [], files: [attachmentObject]});
            } else {
                interaction.editReply({embeds: [new EmojiEmbed()
                    .setEmoji("CHANNEL.PURGE.GREEN")
                    .setTitle("Purge")
                    .setDescription("Messages cleared")
                    .setStatus("Success")
                ], components: []});
            }
        } else {
            await interaction.editReply({embeds: [new EmojiEmbed()
                .setEmoji("CHANNEL.PURGE.GREEN")
                .setTitle("Purge")
                .setDescription("No changes were made")
                .setStatus("Success")
            ], components: []});
        }
    }
};

const check = (interaction: CommandInteraction) => {
    const member = (interaction.member as GuildMember);
    const me = (interaction.guild.me as GuildMember);
    // Check if nucleus has the manage_messages permission
    if (! me.permissions.has("MANAGE_MESSAGES")) throw "I do not have the *Manage Messages* permission";
    // Allow the owner to purge
    if (member.id === interaction.guild.ownerId) return true;
    // Check if the user has manage_messages permission
    if (! member.permissions.has("MANAGE_MESSAGES")) throw "You do not have the *Manage Messages* permission";
    // Allow purge
    return true;
};

export { command, callback, check };