#include utility.js

const MamiSettings = (function() {
    const isSupported = () => {
        if(navigator.userAgent.indexOf('MSIE') >= 0)
            return false;
        if(navigator.userAgent.indexOf('Trident/') >= 0)
            return false;

        if(!('Blob' in window) || !('prototype' in window.Blob)
            || window.Blob.prototype.constructor.name !== 'Blob')
            return false;

        if(!('AudioContext' in window) && !('webkitAudioContext' in window))
            return false;

        if(!('URL' in window) || !('createObjectURL' in window.URL)
            || window.URL.prototype.constructor.name !== 'URL')
            return false;

        if(!('localStorage' in window))
            return false;
        try {
            var testVar = 'test';
            localStorage.setItem(testVar, testVar);
            if(localStorage.getItem(testVar) !== testVar)
                throw '';
            localStorage.removeItem(testVar);
        } catch(e) {
            return false;
        }

        try {
            eval('const c = 1; let l = 2;');
        } catch(e) {
            return false;
        }

        try {
            eval('for(const i of ["a", "b"]);');
        } catch(e) {
            return false;
        }

        return true;
    }

    const exportFile = () => {
        const data = { a: 'Mami Settings Export', v: 1, d: [] };

        for(let i = 0; i < localStorage.length; ++i) {
            const key = localStorage.key(i);
            if(key.substring(0, 4) !== 'umi-')
                continue;

            data.d.push({
                i: key.substring(4),
                v: JSON.parse(localStorage.getItem(key)),
            });
        }

        const exp = $e('a', {
            href: URL.createObjectURL(new Blob(
                [btoa(JSON.stringify(data))],
                { type: 'application/octet-stream' }
            )),
            download: 'settings.mami',
            target: '_blank',
            style: { display: 'none' }
        });
        document.body.appendChild(exp);
        exp.click();
        $r(exp);
    };

    return {
        isSupported: isSupported,
        exportFile: exportFile,
    };
})();