const { Command } = require('../../../../interfaces/');
const { MessageAttachment } = require('discord.js');

const { stripIndents } = require('common-tags');
const moment = require('moment');

const { UploadLimit } = require('../../../../../util/Constants.js');
const { Util } = require('../../../../../util/');
const { InfractionResolves } = require('../../../../../util/Constants.js');

const Constants = {
    PageSize: 5,
    MaxCharacters: 256,
    MaxCharactersVerbose: 128 //Displays more information in the field, decreases characters.
};

class HistoryCommand extends Command {

    constructor(client) {

        super(client, {
            name: 'history',
            module: 'moderation',
            usage: "[user..|channel..]",
            aliases: [
                'moderation'
            ],
            memberPermissions: ['MANAGE_MESSAGES'],
            guildOnly: true,
            arguments: [
                {
                    name: 'before', //Search for moderation actions before x
                    usage: '<date>',
                    type: 'DATE',
                    types: ['FLAG'],
                    required: true
                },
                {
                    name: 'after', //Search for moderation actions after x
                    usage: '<date>',
                    type: 'DATE',
                    types: ['FLAG'],
                    required: true
                },
                {
                    name: 'oldest',
                    aliases: ['old'],
                    type: 'BOOLEAN',
                    types: ['FLAG'],
                    default: true
                },
                {
                    name: 'type',
                    aliases: ['types'],
                    type: 'STRING',
                    types: ['FLAG'],
                    infinite: true,
                    required: true
                },
                {
                    name: 'pagesize',
                    usage: '<1-10>',
                    type: 'INTEGER',
                    types: ['FLAG'],
                    required: true,
                    default: 10,
                    min: 1,
                    max: 10
                },
                {
                    name: 'verbose', //Shows IDs for users/channels.
                    type: 'BOOLEAN',
                    types: ['FLAG'],
                    default: true
                },
                {
                    name: 'export', //Export moderation actions in a JSON.
                    type: 'BOOLEAN',
                    types: ['FLAG'],
                    default: true
                },
                {
                    name: 'private', //Send moderation history in DMs.
                    type: 'BOOLEAN',
                    types: ['FLAG'],
                    default: true
                } //filter, exclude, verbose (NO PAGESIZE)
            ],
            throttling: {
                usages: 2,
                duration: 10
            }
        });

        this.client = client;

    }

    async execute(message, { params, args }) {

        const priv = Boolean(args.private);
        if(args.export) return this._exportLogs(message, priv);

        const query = {
            guild: message.guild.id
        };
        
        const { parsed, parameters } = await this.client.resolver.infinite(params, [
            this.client.resolver.resolveMember.bind(this.client.resolver),
            this.client.resolver.resolveUser.bind(this.client.resolver),
            this.client.resolver.resolveChannel.bind(this.client.resolver)
        ], true, message.guild, (c) => c.type === 'text');

        if(parsed.length > 0) query.target = { $in: parsed.map((p) => p.id) }; //Add resolved ids to the query.
        if(args.before || args.after) {
            query.timestamp = {};
            if(args.before) query.timestamp.$lt = args.before.value.valueOf(); //Add before timestamps to the query.
            if(args.after) query.timestamp.$gt = args.after.value.valueOf(); //Add after timestamps to the query.
        }

        if(args.type) {
            const filter = [];
            for(const value of args.type.value) {
                for(const [ type, matches ] of Object.entries(InfractionResolves)) {
                    if(matches.includes(value.toLowerCase())) {
                        filter.push(type);
                    }
                }
            }
            query.type = { $in: filter };
        }

        const pageSize = args.pagesize ? args.pagesize.value : Constants.PageSize;

        let page = 1;
        if(parameters.length > 0) {
            const number = parseInt(parameters[0]);
            if(!Number.isNaN(number) && number > 1) {
                page = number;
            }
        }
        
        const collectionSize = await this.client.storageManager.mongodb.infractions.count(query);
        if(collectionSize === 0) {
            return message.respond(message.format('C_HISTORY_NORESULTS'), {
                emoji: 'failure'
            });
        }

        const maxPage = Math.ceil(collectionSize/pageSize);
        if(page > maxPage) page = maxPage;

        const infractions = await this.client.storageManager.mongodb.db.collection('infractions').find(query)
            .sort({ timestamp: args.oldest ? 1 : -1 })
            .skip((page-1)*pageSize).limit(pageSize)
            .toArray();

        const embed = {
            author: {
                name: 'Infraction History',
                icon_url: message.guild.iconURL() //eslint-disable-line camelcase
            },
            fields: [],
            footer: {
                text: `• Page ${page}/${maxPage} | ${collectionSize} Results`
            },
            color: message.guild.me.roles.highest.color
        };

        let long = false;
        const handleReason = (text) => {
            const MaxCharacters = Constants[args.verbose ? 'MaxCharactersVerbose' : 'MaxCharacters'];
            text = Util.escapeMarkdown(text);
            if(text.length > MaxCharacters) {
                text = `${text.substring(0, MaxCharacters-3)}...`;
                long = true;
            }
            text = text.replace(/\\n/giu, ' ');
            return text;
        };

        for(let i = 0; i<infractions.length; i++) {
            const infraction = infractions[i];
            let target = null;
            if(infraction.targetType === 'USER') {
                target = await this.client.resolver.resolveUser(infraction.target);
            } else {
                target = await this.client.resolver.resolveChannel(infraction.target, true, message.guild);
            }

            const executor = await this.client.resolver.resolveUser(infraction.executor);

            let string = stripIndents`**Target:** ${Util.escapeMarkdown(target.display)}${args.verbose ? ` (${target.id})` : ''}
                **Moderator:** ${executor ? `${Util.escapeMarkdown(executor.tag)}${args.verbose ? ` (${infraction.executor})` : ''}` : infraction.executor}`;

            if(infraction.data.roleIds) {
                string += `\n${message.guild.format('INFRACTION_DESCRIPTIONROLES', {
                    plural: infraction.data.roleIds.length === 1 ? '' : 's',
                    roles: priv ? infraction.data.roleNames.join(', ') : infraction.data.roleIds.map((r) => `<@&${r}>`).join(' ')
                })}`;
            }

            if(infraction.duration) string += `\n**Duration:** ${Util.duration(infraction.duration)}`;
            if(infraction.points) string += `\n**Points:** ${infraction.points}`;

            string += `\n**Reason:** \`${handleReason(infraction.reason)}\``;
            if(i !== infractions.length-1) string += `\n\u200b`; //Space out cases (as long as its not at the end)

            embed.fields.push({
                name: `__**${infraction.type} \`[case-${infraction.case}]\`** *(${moment(infraction.timestamp).fromNow()})*__`,
                value: string
            });

        }

        if(long) embed.footer.text += ` • To see the full reason, use the ${message.guild.prefix}case command.`;

        const type = message.format('C_HISTORY_SUCCESSTYPE', { old: Boolean(args.oldest) }, true);
        try {
            message.respond(message.format('C_HISTORY_SUCCESS', {
                targets: parsed.length > 0 ? message.format('C_HISTORY_SUCCESSTARGETS', {
                    plural: parsed.length === 1 ? '' : 's',
                    targets: parsed.map((p) => `**${Util.escapeMarkdown(p.display)}**`).join(' ')
                }) : '',
                type
            }), {
                emoji: 'success',
                embed,
                dm: Boolean(args.private)
            });
        } catch(e) { //eslint-disable-line no-unused-vars
            message.respond(message.format('C_HISTORY_FAILTOOLONG'), {
                emoji: 'failure'
            });
        }

    }

    async _exportLogs(message, priv = false) {

        const logs = await this.client.storageManager.mongodb.infractions.find({ guild: message.guild.id });
        const string = JSON.stringify(logs);
        const attachment = new MessageAttachment(Buffer.from(string), `${message.guild.id}-moderation.json`);

        const bytes = Buffer.byteLength(attachment.attachment);

        const premium = priv ? '0' : message.guild.premiumTier;
        if(bytes > UploadLimit[premium]*1024*1024) {
            message.respond(message.format('C_HISTORY_FAILEXPORT', {
                amount: bytes,
                max: UploadLimit[premium]*1024*1024
            }));
        }

        message.respond(message.format('C_HISTORY_SUCCESSEXPORT'), {
            files: [ attachment ],
            emoji: 'success',
            dm: priv
        });

    }

}

module.exports = HistoryCommand;