/* eslint-disable no-labels */
const { MessageAttachment, WebhookClient } = require('discord.js');

const { Observer } = require('../../../interfaces/');
const { Util, Constants: { EmbedLimits } } = require('../../../../util');
const { stripIndents } = require('common-tags');
const moment = require('moment');

const CONSTANTS = {
    COLORS: {
        RED: 16711680, // message delete
        YELLOW: 15120384, // message edit
        LIGHT_BLUE: 11337726, // message pin
        BLUE: 479397
    },
    IMAGES: {
        PREMIUM_LIMIT: 2,
        UPLOAD_LIMIT: {
            '0': 8,
            '1': 8,
            '2': 50,
            '3': 100
        },
        MB_DIVIDER: 1024*1024
    },
    WEEK: 7 * 24 * 60 * 60
};

class GuildLogger extends Observer {

    constructor(client) {

        super(client, {
            name: 'guildLogger',
            priority: 3,
            disabled: false
        });

        this.hooks = [
            ['messageDelete', this.messageDelete.bind(this)],
            ['messageDeleteBulk', this.messageDeleteBulk.bind(this)],
            ['messageUpdate', this.messageEdit.bind(this)],
            ['voiceStateUpdate', this.voiceState.bind(this)],
            ['guildBanAdd', this.ban.bind(this)],
            ['guildBanRemove', this.unban.bind(this)],
            ['guildMemberAdd', this.memberJoin.bind(this)],
            ['guildMemberRemove', this.memberLeave.bind(this)],
            ['guildMemberUpdate', this.memberUpdate.bind(this)]
        ];

        this.attachmentWebhook = new WebhookClient(
            this.client._options.moderation.attachments.webhook.id,
            this.client._options.moderation.attachments.webhook.token
        );

    }

    //TODO: Figure this thing out, this should be called from messageDelete and rawMessageDelete if any attachments are present
    //data should be an object containing the necessary information to query for the attachment from the db, and the relevant information to log it
    //Will figure this out once I get to that point
    async logAttachment(data) {
        
    }

    async messageDelete(message) {

        if(!this.client._built
            || message.webhookID
            || message.author.bot
            || !message.guild
            || !message.guild.available) return;

        await message.guild.settings();
        
        if (!message.member) try {
            message.member = await message.guild.members.fetch(message.author.id);
        } catch (_) {
            // Member not found, do nothing
        }

        const { messageLog } = message.guild._settings;
        if(!messageLog.channel) return undefined;
        
        const { bypass, ignore } = messageLog;
        const logChannel = await message.guild.resolveChannel(messageLog.channel);
        if(!logChannel) return undefined;

        const perms = logChannel.permissionsFor(message.guild.me);
        if (!perms.has('SEND_MESSAGES') || !perms.has('VIEW_CHANNEL') || !perms.has('EMBED_LINKS')) return undefined;

        if(bypass.length && message.member.roles.cache.size) {
            const roles = message.member.roles.cache.map((r) => r.id);
            for (const role of bypass) {
                if (roles.includes(role)) return undefined;
            }
        }
        
        if (ignore && ignore.includes(message.channel.id)) return undefined;

        const hook = await message.guild.getWebhook('messageLog');
        if (!hook) {
            this.client.logger.debug(`Missing messageLog hook in ${message.guild.name} (${message.guild.id})`);
            return;
        }

        const embed = {
            // author: {
            //     name: message.format('MSGLOG_DELETE_TITLE', { channel: message.channel.name, author: Util.escapeMarkdown(message.author.tag) }), //`${message.author.tag} (${message.author.id})`,
            //     icon_url: message.author.displayAvatarURL({ size: 32 }) //eslint-disable-line camelcase
            // },
            title: message.format('MSGLOG_DELETE_TITLE', { channel: message.channel.name, author: Util.escapeMarkdown(message.author.tag) }),
            description: Util.escapeMarkdown(message.content)?.replace(/\\n/gu, ' ') || message.format('MSGLOG_NOCONTENT'),
            color: CONSTANTS.COLORS.RED,
            footer: {
                text: message.format('MSGLOG_DELETE_FOOTER', { msgID: message.id, userID: message.author.id })
            },
            timestamp: message.createdAt
        };
        
        if (message.filtered) {
            embed.fields = [
                {
                    name: message.format('MSGLOG_FILTERED'),
                    value: stripIndents`
                        ${message.format(message.filtered.preset ? 'MSGLOG_FILTERED_PRESET' : 'MSGLOG_FILTERED_VALUE', { ...message.filtered })}
                        ${message.filtered.sanctioned ? message.format('MSGLOG_FILTERED_SANCTIONED') : ''}
                        `// + ()
                }
            ];
        }

        const uploadedFiles = [];
        if(message.attachments.size > 0 && messageLog.attachments && logChannel.nsfw) {
            const imageExtensions = ['.png', '.webp', '.jpg', '.jpeg', '.gif'];
            const data = await this.client.storageManager.mongodb.messages.findOne({ 
                id: message.id
            });

            if (data) {
                const attachments = await this.client.storageManager.mongodb.attachments.find({
                    _id: { $in: data.attachments.filter((a) => a.index).map((a) => a.index) }
                });
                const sortedAttachments = data.attachments.sort((a, b) => b.size - a.size);

                const files = [];
                for (const attachment of sortedAttachments) {

                    const attachmentData = attachments.find((a) => a.attachmentId === attachment.id);

                    if (attachmentData) {
                        // Mongo does some weird serialisation of buffer data, so to access the actual buffer, you have to go 1 level deeper
                        attachmentData.buffer = attachmentData.buffer.buffer; //Buffer.from(attachmentData.buffer, 'base64');
                        const messageAttachment = new MessageAttachment(attachmentData.buffer, attachment.name, { size: attachment.size });

                        if (messageAttachment.size < CONSTANTS.IMAGES.UPLOAD_LIMIT[message.guild.premiumTier] * CONSTANTS.IMAGES.MB_DIVIDER) {

                            if (imageExtensions.includes(attachment.extension) && uploadedFiles.length === 0) {

                                uploadedFiles.push(messageAttachment);
                                embed.image = {
                                    url: `attachment://${attachment.name}`
                                };

                            } else {

                                if (messageAttachment.size > 8 * CONSTANTS.IMAGES.MB_DIVIDER) {

                                    const combined = uploadedFiles.length > 0 ? uploadedFiles.map((f) => f.size).reduce((p, v) => p + v) : 0;
                                    if ((combined + messageAttachment.size) / CONSTANTS.IMAGES.MB_DIVIDER < CONSTANTS.IMAGES.UPLOAD_LIMIT[message.guild.premiumTier]) {
                                        uploadedFiles.push(messageAttachment);
                                    }
                                    
                                } else {
                                    files.push(messageAttachment);
                                }
                            }
                        }
                    }
                }

                let currentFiles = [];
                const uploaded = [];

                const upload = async (files) => {
                    const attachmentMessage = await this.attachmentWebhook.send(null, files).catch((error) => this.client.logger.error(error));
                    attachmentMessage.attachments.map((a) => uploaded.push(`[${a.filename} (${(a.size / CONSTANTS.IMAGES.MB_DIVIDER).toFixed(2)}mb)](${a.url})`));
                };

                for (const file of files) {
                    const currentMb = currentFiles.length > 0 ? currentFiles.map((f) => f.size).reduce((p, v) => p + v) : 0;
                    if (currentMb + file.size > 8 * CONSTANTS.IMAGES.MB_DIVIDER) {
                        await upload(currentFiles);
                        currentFiles = [];
                    } else {
                        currentFiles.push(file);
                    }
                }

                if (currentFiles.length > 0) {
                    await upload(currentFiles);
                }

                if (uploaded.length > 0) {
                    embed.description += `\n\n**${uploadedFiles.length > 0 ? 'Additional ' : ''}Attachment${uploaded.length > 1 ? 's' : ''}:** ${uploaded.join(', ')}`;
                }
            }

        }

        hook.send({ embeds: [embed], files: uploadedFiles });

        /*
        if(message.attachments.size > 0) {
            return this.logAttachment({ msgID: message.id, guildID: guild.id, channelID: channel.id, logChannel });
        }

        const embed = {
            title: message.format('MSGLOG_DELETE_TITLE', { author: Util.escapeMarkdown(author.tag), channel: channel.name }),
            description: message.content,
            footer: {
                text: message.format('MSGLOG_DELETE_FOOTER', { msgID: message.id, userID: author.id })
            },
            color: CONSTANTS.COLORS.RED,
            timestamp: message.createdAt
        };

        await logChannel.send({ embed });
        */

    }

    async messageDeleteBulk(messages) {

        //Status: Should be complete, though additional testing might be necessary

        const { guild, channel } = messages.first();
        if (!guild) return;

        const settings = await guild.settings();
        const chatlogs = settings.messageLog;
        if (!chatlogs.channel) return;

        const { ignore, bypass } = chatlogs;
        if (ignore.includes(channel.id)) return;

        const hook = await guild.getWebhook('messageLog');
        if(!hook) return;

        const cutOff = EmbedLimits.fieldValue;// - 3;
        const fields = [];

        messages = messages.filter((msg) => !msg.author.bot);

        //Compile messages into fields that can be compiled into embeds
        messageLoop: //Oldest messages first
        for (const message of messages.array().sort((a, b) => b.createdTimestamp - a.createdTimestamp)) {

            let { member, content } = message;
            const { author, id } = message;
            content = Util.escapeMarkdown(content);

            if (author.bot) continue;
            if (!member || member.partial) member = await guild.members.fetch(message.author.id).catch(() => {
                return false; 
            });
            if (member && member.roles.cache.size) {
                const roles = member.roles.cache.map((role) => role.id);
                for (const role of roles) {
                    if (bypass.includes(role)) continue messageLoop;
                }
            }

            //const attStr = message.attachments.map((att) => `${att.name} (${att.id})`).join(', ');
            const value = stripIndents`${content ? content.substring(0, cutOff) : message.format('BULK_DELETE_NO_CONTENT')}`;
            //${message.attachments.size > 0 ? `__(Attachments: ${attStr})__` : '' }
            fields.push({
                name: `${Util.escapeMarkdown(author.tag)} @ ${moment.utc(message.createdAt).format('D/M/YYYY H:m:s')} UTC (MSG ID: ${id})`,
                value
            });

            if (content && content.length > cutOff) fields.push({
                name: '\u200b',
                value: content.substring(cutOff)
            });

        }
        
        //Compile embeds
        const embedCutoff = EmbedLimits.embed - 100;
        const embeds = [];
        const embed = { // title gets set later
            fields: [],
            color: CONSTANTS.COLORS.RED
        };
        let length = 0; // Embed total length
        fields.reduce((_embed, field) => {
            //Make sure the total character count doesn't exceed the limit
            const fieldLength = field.name.length + field.value.length;
            if (_embed.fields.length < EmbedLimits.fieldObjects && length + fieldLength < embedCutoff) {
                _embed.fields.push(field);
            } else {
                //"clone" the embed into the array
                embeds.push({ ..._embed });
                _embed.fields = [field];
                length = 0;
            }
            length += fieldLength;
            return _embed;
        }, embed);
        embeds.push(embed);

        //Post messages
        let showed = 0;
        for (let i = 0; i < embeds.length; i++) {
            const embed = embeds[i];
            //Amount of messages showing
            const x = embed.fields.filter((field) => field.name !== '\u200b').length;
            embed.title = guild.format('BULK_DELETE_TITLE', { embedNr: i + 1, channel: channel.name });
            embed.footer = { text: guild.format('BULK_DELETE_FOOTER', { rangeStart: showed + 1, rangeEnd: showed += x, total: messages.size }) };
            const result = await hook.send({ embeds: [embed] }).catch((err) => {
                //Unknown webhook -> webhook was deleted, remove it from db so it doesn't make any more unnecessary calls
                if (err.code === 10015) {
                    guild.updateWebhook('messageLog');
                } else this.client.logger.error(err.stack);
                return { error: true };
            });
            if (result.error) break;
        }

    }

    async messageEdit(oldMessage, newMessage) {

        //Status: Uses webhook, complete
        
        // embeds loading in (ex. when a link is posted) would cause a message edit event
        if(oldMessage.embeds.length !== newMessage.embeds.length && oldMessage.content === newMessage.content) return; 
        if(oldMessage.author.bot) return;

        const { guild } = oldMessage;
        if (!guild) return;
        
        if (!oldMessage.member) oldMessage.member = await guild.members.fetch(oldMessage.author);
        const { member, channel, author } = oldMessage;

        const settings = await guild.settings();
        const chatlogs = settings.messageLog;
        if (!chatlogs.channel) return;

        const { ignore, bypass } = chatlogs;
        const hook = await guild.getWebhook('messageLog');
        if (!hook) return;

        if (bypass && member.roles.cache.size) {
            const roles = member.roles.cache.map((r) => r.id);
            for (const role of bypass) {
                if (roles.includes(role)) return;
            }
        }
        
        if (ignore && ignore.includes(channel.id)) return;

        if(oldMessage.content === newMessage.content && oldMessage.pinned !== newMessage.pinned) {

            const embed = {
                title: oldMessage.format('MSGLOG_PINNED_TITLE', { author: Util.escapeMarkdown(author.tag), channel: channel.name, pinned: oldMessage.format('PIN_TOGGLE', { toggle: newMessage.pinned }, true) }),
                description: oldMessage.format('MSGLOG_EDIT_JUMP', { guild: guild.id, channel: channel.id, message: oldMessage.id }),
                color: CONSTANTS.COLORS.LIGHT_BLUE
            };

            if(oldMessage.content.length) embed.description += '\n' + oldMessage.content.substring(0, 1900);
            if(oldMessage.attachments.size) {
                const img = oldMessage.attachments.first();
                if(img.height && img.width) embed.image = { url: img.url };
            }

            await hook.send({ embeds: [embed] }).catch(this.client.logger.error);

        } else {

            const embed = {
                // author: {
                //     name: oldMessage.format('MSGLOG_EDIT_TITLE', { author: Util.escapeMarkdown(author.tag), channel: channel.name }),
                //     icon_url: oldMessage.author.displayAvatarURL({ size: 32 }) // eslint-disable-line camelcase
                // },
                title: oldMessage.format('MSGLOG_EDIT_TITLE', { author: Util.escapeMarkdown(author.tag), channel: channel.name }),
                footer: {
                    text: oldMessage.format('MSGLOG_EDIT_FOOTER', { msgID: oldMessage.id, userID: author.id })
                },
                description: oldMessage.format('MSGLOG_EDIT_JUMP', { guild: guild.id, channel: channel.id, message: oldMessage.id }),
                color: CONSTANTS.COLORS.YELLOW,
                timestamp: oldMessage.createdAt,
                fields: [
                    // {
                    //     name: oldMessage.format('MSGLOG_EDIT_OLD'),
                    //     value: oldMessage.content.length > 1024 ? oldMessage.content.substring(0, 1021) + '...' : oldMessage.content
                    // },
                    // {
                    //     name: oldMessage.format('MSGLOG_EDIT_NEW'),
                    //     value: newMessage.content.length > 1024 ? newMessage.content.substring(0, 1021) + '...' : newMessage.content
                    // }
                ]
            };

            const oldCon = oldMessage.content,
                newCon = newMessage.content;
            //Original content
            embed.fields.push({
                name: oldMessage.format('MSGLOG_EDIT_OLD'),
                // eslint-disable-next-line no-nested-ternary
                value: oldCon.length > 1024 ? oldCon.substring(0, 1021) + '...' : oldCon.length ? oldCon : '\u200b'
            });
            if(oldCon.length > 1024) embed.fields.push({
                name: '\u200b',
                value: '...' + oldCon.substring(1021)
            });
            //Edited content
            embed.fields.push({
                name: oldMessage.format('MSGLOG_EDIT_NEW'),
                value: newCon.length > 1024 ? newCon.substring(0, 1021) + '...' : newCon
            });
            if(newCon.length > 1024) embed.fields.push({
                name: '\u200b',
                value: '...' + newCon.substring(1021)
            });
            
            //if(oldMessage.content.length > 1024) embed.description += '\n' + oldMessage.format('MSGLOG_EDIT_OLD_CUTOFF');
            //if(newMessage.content.length > 1024) embed.description += '\n' + oldMessage.format('MSGLOG_EDIT_NEW_CUTOFF');
    
            await hook.send({ embeds: [embed] }).catch((err) => {
                this.client.logger.error('Error in message edit:\n' + err.stack);
            });

        }

    }

    async voiceState(oldState, newState) {

        if(oldState.channel && newState.channel && oldState.channel === newState.channel) return;
        const { guild, member } = oldState;

        //TODO: add checks for disconnecting bot from vc when left alone in one (music player)

        const settings = await guild.settings();
        const setting = settings.voiceLog;
        if(!setting || !setting.channel) return;

        const logChannel = await guild.resolveChannel(setting.channel);
        if(!logChannel) return;

        const perms = logChannel.permissionsFor(guild.me);
        if (!perms.has('SEND_MESSAGES') || !perms.has('VIEW_CHANNEL') || !perms.has('EMBED_LINKS')) return;

        let index = null;
        const langParams = {
            nickname: member.nickname ? `\`(${member.nickname})\`` : '',
            tag: Util.escapeMarkdown(member.user.tag),
            id: member.id,
            oldChannel: oldState.channel?.name,
            newChannel: newState.channel?.name
        }; 

        if(!oldState.channel && newState.channel) index = 'VCLOG_JOIN';
        else if(oldState.channel && newState.channel) index = 'VCLOG_SWITCH';
        else index = 'VCLOG_LEAVE';

        this.client.rateLimiter.queueSend(logChannel, guild.format(index, langParams).trim());

    }

    async ban(guild, user) {

    }

    async unban(guild, user) {

    }

    _replaceTags(text, member) {
        const { user, guild } = member;
        return text
            .replace(/\{mention\}/gu, `<@${member.id}>`)
            .replace(/\{tag\}/gu, Util.escapeMarkdown(user.tag))
            .replace(/\{user\}/gu, Util.escapeMarkdown(user.username))
            .replace(/\{serversize\}/gu, guild.memberCount)
            .replace(/\{servername\}/gu, guild.name)
            .replace(/\{accage\}/gu, this.client.resolver.timeAgo(Date.now()/1000 - user.createdTimestamp/1000)) //.replace(/a/, '1')
            .replace(/\{id\}/gu, user.id)
            .trim();
    }

    async memberJoin(member) {

        const { guild } = member;
        const settings = await guild.settings();
        const setting = settings.memberLog;
        if(!setting.channel) return;

        const logChannel = await guild.resolveChannel(setting.channel);
        if(!logChannel) return;

        const perms = logChannel.permissionsFor(guild.me);
        if (!perms.has('SEND_MESSAGES') || !perms.has('VIEW_CHANNEL') || !perms.has('EMBED_LINKS')) return;

        let { joinMessage } = setting;
        joinMessage = this._replaceTags(joinMessage, member);
        this.client.rateLimiter.queueSend(logChannel, joinMessage);

    }

    async memberLeave(member) {

        const { guild } = member;
        const settings = await guild.settings();
        const setting = settings.memberLog;
        if(!setting.channel) return;

        const logChannel = await guild.resolveChannel(setting.channel);
        if(!logChannel) return;

        const perms = logChannel.permissionsFor(guild.me);
        if (!perms.has('SEND_MESSAGES') || !perms.has('VIEW_CHANNEL') || !perms.has('EMBED_LINKS')) return;

        let { leaveMessage } = setting;
        leaveMessage = this._replaceTags(leaveMessage, member);
        this.client.rateLimiter.queueSend(logChannel, leaveMessage);

    }

    async memberUpdate(oldMember, newMember) {

        if(oldMember.nickname === newMember.nickname) return;
        
        const { guild, user } = oldMember;
        const settings = await guild.settings();
        const setting = settings.nicknameLog;
        if(!setting.channel) return;
        
        const logChannel = await guild.resolveChannel(setting.channel);
        if(!logChannel) return;

        const perms = logChannel.permissionsFor(guild.me);
        if (!perms.has('SEND_MESSAGES') || !perms.has('VIEW_CHANNEL') || !perms.has('EMBED_LINKS')) return;

        const oldNick = oldMember.nickname || oldMember.user.username;
        const newNick = newMember.nickname || newMember.user.username;

        const embed = {
            title: guild.format('NICKLOG_TITLE', { user: Util.escapeMarkdown(user.tag) }),
            description: guild.format('NICKLOG_DESCRIPTION', { oldNick, newNick }),
            footer: {
                text: guild.format('NICKLOG_FOOTER', { id: user.id })
            },
            color: CONSTANTS.COLORS.BLUE
        };

        logChannel.send({ embed });

    }

}

module.exports = GuildLogger;