const fs = require('fs');
const decode = require('decode-html');
const { parse } = require('node-html-parser');

function formatEmoji(emoji) {
    return (
        '{ name = "' + emoji.name +
        '", unicode = "' + emoji.unicode +
        '", tags = [ ' + emoji.tags.map(x => '"' + x + '"').join(', ') +
        ' ] }'
    );
}

let html = parse(fs.readFileSync('js/emoji.html',  'utf-8'));
let table = html.getElementsByTagName('table')[0];

let emojis = {};
let currentEmojis = null;

for (let element of table.childNodes) {
    // Skip text
    if (element.nodeType === 3) continue;

    if (element.rawTagName === 'tr') {
        let cols = element.childNodes.filter(x => x.nodeType !== 3);
        let firstCol = cols[0];

        if (firstCol.classList.contains('bighead')) {
            let name = decode(firstCol.childNodes.filter(x => x.nodeType !== 3)[0].childNodes[0]._rawText)
                .split(' ')[0]
                .toLowerCase();

            currentEmojis = [];
            emojis[name] = currentEmojis;
        }

        if (firstCol.rawTagName === 'td') {
            // We're in an emoji line
            let name = decode(cols[3].childNodes[0]._rawText);
            let tags = decode(cols[4].childNodes[0]._rawText).split('|').map(x => x.trim());
            let unicode = cols[2].childNodes[0].childNodes[0].rawAttrs.split("'")[1];
            currentEmojis.push({
                unicode, name, tags
            });
        }

    }
}

delete(emojis.component);

// Generate elm

console.log('module Emoji exposing (..)');
console.log('\n');

console.log('type alias Emoji =');
console.log('    { name : String');
console.log('    , unicode : String');
console.log('    , tags : List String');
console.log('    }');
console.log('\n');

console.log('type alias Emojis =');
let first = true;
for (let key in emojis) {
    console.log('    ' + (first ? '{' : ',') + ' ' + key + ' : List Emoji');
    first = false;
}
console.log('    }')
console.log('\n');

console.log('type Category');
first = true;
for (let key in emojis) {
    console.log('    ' + (first ? '=' : '|') + ' ' + key[0].toUpperCase() + key.slice(1).toLowerCase());
    first = false;
}
console.log('\n');

console.log('categories : List Category');
console.log('categories =');
console.log('    [' + Object.keys(emojis).map(x => x[0].toUpperCase() + x.slice(1).toLowerCase()).join(', ') + ']');
console.log('\n');

console.log('categoryEmoji : Category -> Emoji');
console.log('categoryEmoji category =');
console.log('    case category of');

for (let key in emojis) {
    console.log('        ' + key[0].toUpperCase() + key.slice(1).toLowerCase() + ' ->');
    console.log('            ' + formatEmoji(emojis[key][0]) + '\n');
}
console.log();

console.log('getEmojis : Category -> List Emoji')
console.log('getEmojis category =');
console.log('    case category of');

for (let key in emojis) {
    console.log('        ' + key[0].toUpperCase() + key.slice(1).toLowerCase() + ' ->');
    console.log('            emojis.' + key + '\n');
}
console.log();

console.log('emojis : Emojis');
console.log('emojis =');
let first1 = true;

for (let key in emojis) {
    console.log('    ' + (first1 ? '{' : ',') + ' ' + key + ' =');
    let first2 = true;
    for (let emoji of emojis[key]) {
        console.log('        ' + (first2 ? '[' : ',') + ' ' + formatEmoji(emoji));
        first2 = false;
    }
    console.log('        ]');
    first1 = false;
}

console.log('    }');