const { MessageAttachment, WebhookClient } = require('discord.js');

const { Observer } = require('../../../interfaces/');
const { Util } = require('../../../../util');

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: true
        });

        this.hooks = [
            // ['message', this.storeAttachment.bind(this)], //Attachment logging
            ['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) message.member = await message.guild.members.fetch(message.author.id);

        const { messageLog } = message.guild._settings;
        if(!messageLog.channel) return undefined;
        
        const { ignoredRoles, ignoredChannels } = 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')) return undefined;

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

        const embed = {
            author: {
                name: `${message.author.tag} (${message.author.id})`,
                icon_url: message.author.displayAvatarURL({ size: 32 }) //eslint-disable-line camelcase
            },
            description: Util.escapeMarkdown(message.content).replace(/\\n/gu, ' '),
            color: CONSTANTS.COLORS.RED,
            footer: {
                text: `Message deleted in #${message.channel.name} | Message ID: ${message.id}`
            },
            timestamp: message.createdAt
        };

        const uploadedFiles = [];
        if(message.attachments.size > 0 && messageLog.attachments) {
            const imageExtensions = ['.png', '.webp', '.jpg', '.jpeg', '.gif'];
            const data = await this.client.transactionHandler.send({
                provider: 'mongodb',
                request: {
                    collection: 'messages',
                    type: 'findOne',
                    query: {
                        id: message.id
                    }
                }
            });

            const attachments = await this.client.transactionHandler.send({
                provider: 'mongodb',
                request: {
                    collection: 'attachments',
                    type: 'find',
                    query: {
                        _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) {
                    attachmentData.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) => console.error(error));
                attachmentMessage.attachments.map((a) => uploaded.push(`[${a.filename} (${(a.size/CONSTANTS.IMAGES.MB_DIVIDER).toFixed(2)}mb)](${a.url})`));
                console.log(attachmentMessage.attachments);
            };

            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);
            }

            console.log(uploaded.length);

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

        }

        logChannel.send({ 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) {
        
    }

    async messageEdit(oldMessage, newMessage) {

        // embeds loading in (ex. when a link is posted) would cause a message edit event
        if(oldMessage.embeds.length !== newMessage.embeds.length) 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 { ignoredRoles, ignoredChannels } = chatlogs;
        const logChannel = await guild.resolveChannel(chatlogs.channel);
        if(!logChannel) return;

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

        if (ignoredRoles && member.roles.cache.size) {
            const roles = member.roles.cache.map((r) => r.id);
            for (const role of ignoredRoles) {
                if (roles.includes(role)) return;
            }
        }
        
        if (ignoredChannels && ignoredChannels.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 logChannel.send({ embed }).catch(this.client.logger.error);

        } else {

            const embed = {
                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'),
                value: oldCon.length > 1024 ? oldCon.substring(0, 1021) + '...' : oldCon
            });
            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 logChannel.send({ 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')) 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(/\{guildsize\}/gu, guild.memberCount)
            .replace(/\{guildname\}/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')) 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')) 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')) 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;