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"use strict";

// Dependencies
var protocols = require("protocols"),
    isSsh = require("is-ssh"),
    qs = require("query-string");

/**
 * parsePath
 * Parses the input url.
 *
 * @name parsePath
 * @function
 * @param {String} url The input url.
 * @return {Object} An object containing the following fields:
 *
 *  - `protocols` (Array): An array with the url protocols (usually it has one element).
 *  - `protocol` (String): The first protocol, `"ssh"` (if the url is a ssh url) or `"file"`.
 *  - `port` (null|Number): The domain port.
 *  - `resource` (String): The url domain (including subdomains).
 *  - `user` (String): The authentication user (usually for ssh urls).
 *  - `pathname` (String): The url pathname.
 *  - `hash` (String): The url hash.
 *  - `search` (String): The url querystring value.
 *  - `href` (String): The input url.
 *  - `query` (Object): The url querystring, parsed as object.
 */
function parsePath(url) {
    url = (url || "").trim();
    var output = {
        protocols: protocols(url),
        protocol: null,
        port: null,
        resource: "",
        user: "",
        pathname: "",
        hash: "",
        search: "",
        href: url,
        query: Object.create(null)
    },
        protocolIndex = url.indexOf("://"),
        resourceIndex = -1,
        splits = null,
        parts = null;

    if (url.startsWith(".")) {
        if (url.startsWith("./")) {
            url = url.substring(2);
        }
        output.pathname = url;
        output.protocol = "file";
    }

    var firstChar = url.charAt(1);
    if (!output.protocol) {
        output.protocol = output.protocols[0];
        if (!output.protocol) {
            if (isSsh(url)) {
                output.protocol = "ssh";
            } else if (firstChar === "/" || firstChar === "~") {
                url = url.substring(2);
                output.protocol = "file";
            } else {
                output.protocol = "file";
            }
        }
    }

    if (protocolIndex !== -1) {
        url = url.substring(protocolIndex + 3);
    }

    parts = url.split(/\/|\\/);
    if (output.protocol !== "file") {
        output.resource = parts.shift();
    } else {
        output.resource = "";
    }

    // user@domain
    splits = output.resource.split("@");
    if (splits.length === 2) {
        output.user = splits[0];
        output.resource = splits[1];
    }

    // domain.com:port
    splits = output.resource.split(":");
    if (splits.length === 2) {
        output.resource = splits[0];
        if (splits[1]) {
            output.port = Number(splits[1]);
            if (isNaN(output.port)) {
                output.port = null;
                parts.unshift(splits[1]);
            }
        } else {
            output.port = null;
        }
    }

    // Remove empty elements
    parts = parts.filter(Boolean);

    // Stringify the pathname
    if (output.protocol === "file") {
        output.pathname = output.href;
    } else {
        output.pathname = output.pathname || (output.protocol !== "file" || output.href[0] === "/" ? "/" : "") + parts.join("/");
    }

    // #some-hash
    splits = output.pathname.split("#");
    if (splits.length === 2) {
        output.pathname = splits[0];
        output.hash = splits[1];
    }

    // ?foo=bar
    splits = output.pathname.split("?");
    if (splits.length === 2) {
        output.pathname = splits[0];
        output.search = splits[1];
    }

    output.query = qs.parse(output.search);
    output.href = output.href.replace(/\/$/, "");
    output.pathname = output.pathname.replace(/\/$/, "");
    return output;
}

module.exports = parsePath;