const fs = require('node:fs');
const prettier = require('prettier');
const config = require('../tailwind.config.js');

const groupToPrefix = (group, prefix) => {
    return Object.entries(group).map(([key, value]) => {
        if (value instanceof Object && !(value instanceof Array)) {
            return groupToPrefix(value, `${prefix}-${key}`);
        } else {
            return `--${prefix}-${key}: ${value};`
        }
    }).join('');
};
/*
  Converts the tailwind config elements into custom props.
*/
const generateCSSProps = () => {
    let result = '';

    const groups = [
        {key: 'colors', prefix: 'color'},
        {key: 'spacing', prefix: 'space'},
        {key: 'fontSize', prefix: 'text'},
        {key: 'fontFamily', prefix: 'font-family'},
        {key: 'screens', prefix: 'screen'},
        {key: 'gap', prefix: 'gap'},
    ];

    // Add a note that this is auto generated
    result += `
    /* VARIABLES GENERATED WITH TAILWIND CONFIG ON ${new Date().toLocaleDateString()}.
    Tokens location: ./tailwind.config.js */

    :root {
  `;

    // Loop each group's keys, use that and the associated
    // property to define a :root custom prop
    groups.forEach(({key, prefix}) => {
        const group = config.theme[key];

        if (!group) {
            return;
        }


        // Object.keys(group).forEach(key => {
        //   result += `--${prefix}-${key}: ${group[key]};`;
        // });

        result += groupToPrefix(group, prefix);
    });

    // Close the :root block
    result += `
    }
  `;

    // Make the CSS readable to help people with auto-complete in their editors
    result = prettier.format(result, {parser: 'scss'});

    // Push this file into the CSS dir, ready to go
    fs.writeFileSync('./src/css/custom-props.css', result);
};

generateCSSProps();
module.exports = generateCSSProps;