import { div, pfp, banner, parse, button, body, a, span, crawl, parseDate, parseMonth } from './main.js'
import { loadself, loadusers, loadusersposts, updateavatar, updatebanner, logout, follow, follow_status, friends } from './api.js'
import { parsePost, parseUser, header } from './components.js'

function swap(tab) {
    let buttons = []
    buttons[0] = document.querySelector("#profilepostbutton");
    buttons[1] = document.querySelector("#profileaboutbutton");
    buttons[2] = document.querySelector("#profilefriendsbutton");
    buttons[3] = document.querySelector("#profilefollowersbutton");
    buttons[4] = document.querySelector("#profilefollowingbutton");

    let sections = []
    sections[0] = document.querySelector("#posts");
    sections[1] = document.querySelector("#about");
    sections[2] = document.querySelector("#friends");
    sections[3] = document.querySelector("#followers");
    sections[4] = document.querySelector("#following");
    
    let load = document.querySelector(".loadp");

    for (const i in buttons) {
        if (i == tab) {
            buttons[i].classList.add("selected")
            sections[i].classList.remove("hidden")
        } else {
            buttons[i].classList.remove("selected")
            sections[i].classList.add("hidden")
        }
    }

    if (load) {
        if (tab == 0) {
            load.classList.remove("hidden")
        } else {
            load.classList.add("hidden")
        }
    }
}

function changeimage(fn) {

    var input = document.createElement('input')
    input.type = 'file'
    input.accept= 'image/png'

    input.onchange = async (e) => { 

        var popup = document.getElementById("popup")
        var loader = popup.getElementsByClassName("loading")[0]
        var message = popup.getElementsByClassName("message")[0]

        loader.classList.add("hidden")
        message.innerHTML = '';
        popup.classList.remove("hidden")

        var file = e.target.files[0];
        if (file.type !== 'image/png') {
            message.innerHTML = 'Image must be a PNG';
            return
        }

        loader.classList.remove("hidden")

        let response = await fn(file);
        
        loader.classList.add("hidden")
        message.innerHTML = response.msg
    }

    input.click();
}

function status_text(status) {
    switch (status) {
        case 1:
            return 'Following ✓'
        case 2:
            return 'Follow Back'
        case 3:
            return 'Friends ✓'
        default:
            return 'Follow'
      }
}

async function render() {

    let status;
    if (!isself) {
        let response = await follow_status(data.user.user_id)
        if (response.status == 200) {
            status = parseInt(response.msg)
        } else {
            status = 0;
        }
    }

    let response = (await friends(data.user.user_id)).json
    if (response == undefined) {
        response = []
    }

    let friends_arr = response[0];
    let followers = response[1];
    let following = response[2];

    let new_body = 
    body({},
        ...header(false, false, false, data.self.user_id),
        div({id: 'top'},
            div({id: 'banner'},
                div({class: 'bg'},
                    banner(data.user.user_id)
                ),
                isself ? div({class: 'changebanner', onclick: () => changeimage(updatebanner)}) : parse(''),
            ),
            div({id: 'info'},
                div({class: 'face'},
                    pfp(data.user.user_id),
                    isself ? div({class: 'changeavatar', onclick: () => changeimage(updateavatar)}) : parse(''),
                ),
                div({class: 'infodata'},
                    span({class: 'bold ltext'},
                        parse(data.user.firstname + ' ' + data.user.lastname)
                    ),
                    span({class: 'gtext'},
                        parse('Joined ' + parseDate(new Date(data.user.date)))
                    )
                ),
                !isself ?
                div({class: 'right'},
                    div({class: `follow ${status == 3 ? 'friend' : ''}`, onclick: async (event) => {
                        let button = event.target
                        if (button.tagName == 'SPAN') {
                            button = button.parentElement 
                        }
                        
                        let response
                        if (status % 2 == 0) {
                            response = await follow(true, data.user.user_id);
                        } else {
                            response = await follow(false, data.user.user_id);
                        }

                        if (response.status == 200) {
                            status = parseInt(response.msg)
                        } else {
                            return
                        }

                        button.firstChild.innerHTML = status_text(status)
                        if (status == 3) {
                            button.classList.add('friend')
                        } else {
                            button.classList.remove('friend')
                        }
                    }},
                        span({class: 'gtext'},
                            parse(status_text(status))    
                        )
                    )
                )
                : parse('')
            ),
            div({class: 'fullline', style: 'width: 80em; margin-bottom: 0; z-index: 0;'}),
            div({class: 'profilebuttons'},
                button({id: 'profilepostbutton', class: 'selected', onclick: () => swap(0)},
                    parse('Posts')
                ),
                button({id: 'profileaboutbutton', onclick: () => swap(1)},
                    parse('About')
                ),
                button({id: 'profilefriendsbutton', onclick: () => swap(2)},
                    parse('Friends')
                ),
                button({id: 'profilefollowersbutton', onclick: () => swap(3)},
                    parse('Followers')
                ),
                button({id: 'profilefollowingbutton', onclick: () => swap(4)},
                    parse('Following')
                ),
                div({style: 'flex: 20'}),
                isself ? button({class: 'logout', onclick: async () => {
                    const response = await logout()
                    if (response.status != 200) return;
                    location.href = '/login'
                }},
                    parse('Logout')
                )
                : parse('')
            )
        ),
        div({id: 'posts'},
            ...data.posts.map(p => parsePost(p, data.users, data.self))
        ),
        div({id: 'load'},
            a({class: 'loadp bold gtext', onclick: async () => {
                
                const posts = await load()
                data.posts.push(... posts)

                const el = document.getElementById("posts")

                for (const post of posts) {
                    el.appendChild(
                        parsePost(post, data.users, data.self)
                    )
                }
            }},
                parse('Load more posts')
            )
        ),
        div({id: 'about', class: 'post hidden'},
            span({class: 'bold ltext'},
                parse('About')
            ),
            div({class: 'data'},
                span({class: 'gtext bold'},
                    parse('Name: ' + data.user.firstname + ' ' + data.user.lastname)
                ),
                span({class: 'gtext bold'},
                    parse('Email: ' + data.user.email)
                ),
                span({class: 'gtext bold'},
                    parse('Gender: ' + data.user.gender)
                ),
                span({class: 'gtext bold'},
                    parse('Birthday: ' + parseMonth(data.user.month) + ' ' + data.user.day + ', ' + data.user.year)
                ),
                span({class: 'gtext bold'},
                    parse('User ID: ' + data.user.user_id)
                )
            )
        ),
        div({id: 'friends', class: 'hidden'},
            ...friends_arr.map(u => parseUser(u))
        ),
        div({id: 'followers', class: 'hidden'},
            ...followers.map(u => parseUser(u))
        ),
        div({id: 'following', class: 'hidden'},
            ...following.map(u => parseUser(u))
        ),
        div({id: 'popup', class: 'hidden'},
            div({class: 'createpost'},
                div({class: 'close', onclick: () => document.getElementById('popup').classList.add('hidden')}),
                span({class: 'ltext ctext bold'},
                    parse('Uploading')
                ),
                div({class: 'fullline'}),
                div({class: 'fullwidth'},
                    div({class: 'loading'},
                        div({}),
                        div({}),
                        div({}),
                        div({})
                    )
                ),
                span({class: 'message ctext', style: 'padding-top: 10px'})
            )
        )
    )

    document.body.replaceWith(new_body)

    if (data.posts.length < 10) { 
        document.getElementById('load').remove()
    }

}

var isself = false
var page = 0
const data = {
    self: {},
    user: {},
    users: {},
    posts: []
}

async function load(id) {

    if (id === undefined) {
        id = data.user.user_id
    }

    const posts = (await loadusersposts(id, page)).json
    if (posts == undefined) {
        posts = []
    }
    
    if (posts.length < 1) {
        let el = document.getElementsByClassName('loadp')[0]
        if (el) {
            el.remove()
        }
    } else {
        page++
    }

    const batch = Array.from(new Set(crawl('user_id', posts))).filter(id => data.users[id] == undefined)

    if (!isself) {
        batch.push(id)
    }

    if (batch.length != 0) {
        const users = (await loadusers(batch)).json
        if (users == undefined) {
            users = []
        }

        for (const user of users) {
            data.users[user.user_id] = user
        }
    }
    return posts
}

async function init() {

    let request = await loadself()

    if (request.status === 429) {
        let new_body = 
        body({},
            ...header(false, false)
        )

        document.body.replaceWith(new_body)
        throw new Error("Rate limited");
    }

    if (request.json == undefined) {
        location.href = '/login'
        return
    }

    data.self = request.json;
    data.users[data.self.user_id] = data.self
    
    var params = {};
    for (const [key, value] of new URLSearchParams(location.search)) {
        params[key] = value
    }

    let id;
    if (params.id !== undefined && !isNaN(params.id)) {
        id = parseInt(params.id);
    } else {
        id = data.self.user_id
    }

    isself = id === data.self.user_id

    const posts = await load(id)
    data.posts.push(... posts)

    data.user = data.users[id]

    render()
}

init()