var fs            = require("fs"),
    path          = require("path"),
    child_process = require("child_process");

var protobuf = require("..");

function basenameCompare(a, b) {
    var aa = String(a).replace(/\.\w+$/, "").split(/(-?\d*\.?\d+)/g),
        bb = String(b).replace(/\.\w+$/, "").split(/(-?\d*\.?\d+)/g);
    for (var i = 0, k = Math.min(aa.length, bb.length); i < k; i++) {
        var x = parseFloat(aa[i]) || aa[i].toLowerCase(),
            y = parseFloat(bb[i]) || bb[i].toLowerCase();
        if (x < y)
            return -1;
        if (x > y)
            return 1;
    }
    return a.length < b.length ? -1 : 0;
};

exports.requireAll = function requireAll(dirname) {
    dirname   = path.join(__dirname, dirname);
    var files = fs.readdirSync(dirname).sort(basenameCompare),
        all = {};
    files.forEach(function(file) {
        var basename = path.basename(file, ".js"),
            extname  = path.extname(file);
        if (extname === ".js")
            all[basename] = require(path.join(dirname, file));
    });
    return all;
};

exports.inspect = function inspect(object, indent) {
    if (!object)
        return "";
    var chalk = require("chalk");
    var sb = [];
    if (!indent)
        indent = "";
    var ind = indent ? indent.substring(0, indent.length - 2) + "└ " : "";
    sb.push(
        ind + chalk.bold(object.toString()) + (object.visible ? " (visible)" : ""),
        indent + chalk.gray("parent: ") + object.parent
    );
    if (object instanceof protobuf.Field) {
        if (object.extend !== undefined)
            sb.push(indent + chalk.gray("extend: ") + object.extend);
        if (object.partOf)
            sb.push(indent + chalk.gray("oneof : ") + object.oneof);
    }
    sb.push("");
    if (object.fieldsArray)
        object.fieldsArray.forEach(function(field) {
            sb.push(inspect(field, indent + "  "));
        });
    if (object.oneofsArray)
        object.oneofsArray.forEach(function(oneof) {
            sb.push(inspect(oneof, indent + "  "));
        });
    if (object.methodsArray)
        object.methodsArray.forEach(function(service) {
            sb.push(inspect(service, indent + "  "));
        });
    if (object.nestedArray)
        object.nestedArray.forEach(function(nested) {
            sb.push(inspect(nested, indent + "  "));
        });
    return sb.join("\n");
};

exports.require = function(name, version) {
    var sub = "";
    var p = name.indexOf("/");
    if (p > -1) {
        sub = name.substring(p);
        name = name.substring(0, p);
    }
    var cwd = path.join(__dirname, "..");
    var dir = path.join(cwd, "node_modules", name);
    try {
        // do not feed the cache
        require.resolve(path.join(dir, "package.json"));
    } catch (e) {
        console.error("installing " + name + "@" + version + " ...");
        child_process.execSync("npm install " + name + "@" + version, {
            cwd: cwd
        });
    }
    return require(name + sub);
};

exports.wrap = function(name, OUTPUT, ROOT) {
    if (!ROOT)
        ROOT = "default";
    var wrap;
    try {
        // try built-in wrappers first
        wrap = fs.readFileSync(path.join(__dirname, "wrappers", name + ".js")).toString("utf8");
    } catch (e) {
        // otherwise fetch the custom one
        wrap = fs.readFileSync(path.resolve(process.cwd(), name)).toString("utf8");
    }
    wrap = wrap.replace(/%ROOT%/g, JSON.stringify(ROOT));
    wrap = wrap.replace(/( *)%OUTPUT%/, function($0, $1) {
        return $1.length ? OUTPUT.replace(/^/mg, $1) : OUTPUT;
    });
    return wrap;
};

exports.pad = function(str, len, l) {
    while (str.length < len)
        str = l ? str + " " : " " + str;
    return str;
};

exports.reserved = function(name) {
    return /^(?:do|if|in|for|let|new|try|var|case|else|enum|eval|false|null|this|true|void|with|break|catch|class|const|super|throw|while|yield|delete|export|import|public|return|static|switch|typeof|default|extends|finally|package|private|continue|debugger|function|arguments|interface|protected|implements|instanceof)$/.test(name);
};