// <nowiki>
$(() =>
{
    if(mw.config.get("wgCanonicalNamespace") != "User") return;
    
    console.log("FMH is setting up.");
    
    var api = new mw.Api();
    
    var source = mw.config.get("wgPageName");
    var link = RegExp(`(\\[\\[)${source}((\\|.*?)?\\]\\])`, "g");
    
    // Add portlet link.
    $("#p-cactions ul").append("<li id='ca-fmh'><a href='#' title='Rename this file and redirect all links to the new name'>FMH</a></li>");
    $("#ca-fmh").on("click", e =>
    {
    	console.log("FMH is doing something.");
    	
        // (1) Get destination.
        var destination = prompt("Please enter the destination of this move");
        
        if(!destination) return;
        
        // (2) Move the page.
        // api.post(
        // {
        //     "action": "move",
        //     "from": source,
        //     "to": `{$destination}`,
        //     "reason": "More suitable name",
        //     "movetalk": true,
        //     "token": mw.user.tokens.get("csrfToken")
        // })
        // .fail(result => { mw.notify("Failed to move!", {type: "error"}); })
        // .done(() =>
        // {
            // Replace page content with reporting area.
            $(".mw-parser-output")[0].innerHTML = "<div id='fmh-reports'></div>";
            
            var reports = document.getElementById("fmh-reports");
            reports.insertAdjacentHTML("afterend", `<p style='color:green'>Moved ${source} to ${destination}</p>`);
            
            // (4) Get a list of pages. Currently, only gets the first 500.
            api.get(
            {
                "action": "query",
                "list": "backlinks",
                "bltitle": source,
                "bllimit": "max"
            })
            .fail(result => { mw.notify("Failed to retrieve links to this file!", {type: "error"}); })
            .done(data =>
            {
                for(var i = 0; i < data.query.backlinks.length; i++)
                {
                	redirectFileLinks(data.query.backlinks[i].title, destination, i, data.query.backlinks.length - 1);
                }
            });
        // });
    });
    
    function redirectFileLinks(pagename, dest, number, end)
    {
    	var reports = document.getElementById("fmh-reports");
    	
		api.post(
        {
            "action": "edit",
            "title": pagename,
            "text": getWikitext(pagename).replace(link, (match, p1, p2) => { return p1 + dest + p2; }),
            "summary": "Redirecting links to new name ([[User:Guywan/Scripts/FileMoverHelper-dev.js|Dev test]])",
            "token": mw.user.tokens.get("csrfToken")
        })
        .done(() =>
        {
            reports.insertAdjacentHTML("afterend", `<p style='color:green'>Finished redirecting links in <a href='/wiki/${pagename}'>${pagename}</a> ...</p>`);
            if(number == end)
            {
                reports.insertAdjacentHTML("afterend", "<p style='color:green;font-size:1.5em'>Operation completed! You may refresh or leave this page</p>");
            }
        })
        .fail(() =>
        {
        	reports.insertAdjacentHTML("afterend", `<p style='color:red'>Failed to redirect links in ${pagename} ...</p>`);
        });
    }

	function getWikitext(page)
	{
		return $.ajax(
		{
			url: mw.util.getUrl(page) + "?action=raw",
			data: "text",
			async: false
		}).responseText;
	}
});
// </nowiki>