/*
 * Discord: Don't copy stuff into this box
 * Me: dOn'T COpy sTuFf iNtO tHIs bOx
 */
clearMessages = function (guild_id, author_id, authToken, deleted = new Set()) {
    if (guild_id[0] == "_" && guild_id[guild_id.length - 1] == "_") {
        alert("Oops! You forgot to set the guild_id. Please fill it in.")
        return;
    }
    if (author_id[0] == "_" && author_id[author_id.length - 1] == "_") {
        alert("Oops! You forgot to set the author_id. Please fill it in.")
        return;
    }
    
    const searchURL = `https://discordapp.com/api/v9/guilds/${guild_id}/messages/search?author_id=${author_id}&include_nsfw=true&sort_by=timestamp&sort_order=asc`
    const headers = { Authorization: authToken }
    let clock = 0
    interval = 3000
    function delay(duration) {
        return new Promise((resolve, reject) => {
            setTimeout(resolve, duration)
        })
    }
    function loadMessages() {
        return fetch(searchURL, { headers })
    }
    function tryDeleteMessage(message) {
        // RAce coNDItiOn
        if (!deleted.has(message.id)) { // skip already deleted messages
            console.log(`Deleting message ${message.id} from ${message.author.username} (${message.content}...)`)
            return fetch(`https://discordapp.com/api/v9/channels/${message.channel_id}/messages/${message.id}`, { headers, method: 'DELETE' })
        }
    }
    let messagesStore = []

    loadMessages()
        .then(resp => resp.json())
        .then(messages => {
            messages = messages.messages
            if (messages === undefined || messages === null || messages.length == 0) {
                console.log(`Couldn't load messages. Check guild id, author id, and auth token.`)
                return
            }
            messages = messages.filter(m => m) // clean undefined
            messages = [].concat.apply([], messages); // flatten
            messages = messages.filter(m => m) // clean undefined
            if (messages.length === 0) {
                console.log(`Couldn't load messages. Check guild id, author id, and auth token.`)
                return
            }
        
            // only delete hits
            messages = messages.filter(m => m.hit == true)
            // unique by id
            messages = messages.filter((e, i) => messages.findIndex(a => a.id === e.id) === i);

            beforeId = messages[messages.length-1].id
            messagesStore = messagesStore.concat(messages)
            return Promise.all(messagesStore.map(message => {
                return delay(clock += interval)
                    .then(() => tryDeleteMessage(message))
                    .then(resp => {
                        if (resp) {
                            if (resp.status == 429) {
                                interval += 100
                                console.log(`Too fast; bumping interval to ${interval}`)
                            } else if (resp.status === 204) {
                                deleted.add(message.id) // mark deleted
                                return resp.text()
                            }
                        }
                    })
            }))
        })
        .then(function() {
            if (messagesStore.length !== 0) {
                clearMessages(guild_id, author_id, authToken, deleted)
            } else {
                console.log(`We have loaded all messages in this chat.`)
            }
        })
}

// If the script is having trouble automatically grabbing auth token, please fill it in manually here. Check README for instructions.
authToken = "";

guild_id = '____________guild_id_here_______________'
author_id = '____________author_id_here______________'

function grabAuthTokenFast() {
    var localToken = document.body.appendChild(document.createElement(`iframe`)).contentWindow.localStorage.token;
    if (localToken !== undefined) {
        authToken = JSON.parse(localToken);
        return true;
    }
    return false;
}

function grabAuthToken() {
    if (authToken.length === 0) {
        // Lmao bypass token security measures
        window.onbeforeunload = grabAuthToken;
        window.location.reload();

        // yoink
        var localToken = document.body.appendChild(document.createElement(`iframe`)).contentWindow.localStorage.token;
        if (localToken !== undefined) {
            authToken = JSON.parse(localToken);
            setTimeout(main, 100, authToken);
        }
    }
    return false;
}

function main(authToken) {
    if (authToken.length !== 0) {
        console.log(`Successfully grabbed your auth token: ` + authToken)
        console.log(`Don't share this token with anyone!`)
        clearMessages(guild_id, author_id, authToken);
    } else {
        console.log(`Getting the auth token from localStorage isn't supported on your client. Use Firefox or grab it from a network request's headers.`)
        console.log(`To do that go to the Network tab of your inspector and copy the Authorization header of a request. There are detailed instructions in the README.`)
    }
}

if (grabAuthTokenFast()) {
    console.log("Successfully grabbed auth token using easy method");
    main(authToken);
} else {
    window.alert("Grabbing your auth token. If a confirm window shows up, please click 'Cancel' in Chrome / 'Stay on Page' in Firefox.");
    if (authToken.length !== 0) {
        main(authToken);
    } else {
        grabAuthToken();
    }
}