// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// codemirror: v.5.61.1

(function(mod) {
	if (typeof exports == "object" && typeof module == "object") // CommonJS
		mod(require("../../lib/codemirror"));
	else if (typeof define == "function" && define.amd) // AMD
		define(["../../lib/codemirror"], mod);
	else // Plain browser env
		mod(CodeMirror);
})(function(CodeMirror) {
	"use strict";

	var listRE = /^(\s*)(>[> ]*|[*+-] \[[x ]\]\s|[*+-]\s|(\d+)([.)]))(\s*)/,
			emptyListRE = /^(\s*)(>[> ]*|[*+-] \[[x ]\]|[*+-]|(\d+)[.)])(\s*)$/,
			unorderedListRE = /[*+-]\s/;

	CodeMirror.commands.newlineAndIndentContinueMarkdownList = function(cm) {
		if (cm.getOption("disableInput")) return CodeMirror.Pass;
		var ranges = cm.listSelections(), replacements = [];
		for (var i = 0; i < ranges.length; i++) {
			var pos = ranges[i].head;

			// If we're not in Markdown mode, fall back to normal newlineAndIndent
			var eolState = cm.getStateAfter(pos.line);
			var inner = CodeMirror.innerMode(cm.getMode(), eolState);
			if (inner.mode.name !== "markdown") {
				cm.execCommand("newlineAndIndent");
				return;
			} else {
				eolState = inner.state;
			}

			var inList = eolState.list !== false;
			var inQuote = eolState.quote !== 0;

			var line = cm.getLine(pos.line), match = listRE.exec(line);
			var cursorBeforeBullet = /^\s*$/.test(line.slice(0, pos.ch));
			if (!ranges[i].empty() || (!inList && !inQuote) || !match || cursorBeforeBullet) {
				cm.execCommand("newlineAndIndent");
				return;
			}
			if (emptyListRE.test(line)) {
				var endOfQuote = inQuote && />\s*$/.test(line)
				var endOfList = !/>\s*$/.test(line)
				if (endOfQuote || endOfList) cm.replaceRange("", {
					line: pos.line, ch: 0
				}, {
					line: pos.line, ch: pos.ch + 1
				});
				replacements[i] = "\n";
			} else {
				var indent = match[1], after = match[5];
				var numbered = !(unorderedListRE.test(match[2]) || match[2].indexOf(">") >= 0);
				var bullet = numbered ? (parseInt(match[3], 10) + 1) + match[4] : match[2].replace("x", " ");
				replacements[i] = "\n" + indent + bullet + after;

				if (numbered) incrementRemainingMarkdownListNumbers(cm, pos);
			}
		}

		cm.replaceSelections(replacements);
	};

	// Auto-updating Markdown list numbers when a new item is added to the
	// middle of a list
	function incrementRemainingMarkdownListNumbers(cm, pos) {
		var startLine = pos.line, lookAhead = 0, skipCount = 0;
		var startItem = listRE.exec(cm.getLine(startLine)), startIndent = startItem[1];

		do {
			lookAhead += 1;
			var nextLineNumber = startLine + lookAhead;
			var nextLine = cm.getLine(nextLineNumber), nextItem = listRE.exec(nextLine);

			if (nextItem) {
				var nextIndent = nextItem[1];
				var newNumber = (parseInt(startItem[3], 10) + lookAhead - skipCount);
				var nextNumber = (parseInt(nextItem[3], 10)), itemNumber = nextNumber;

				if (startIndent === nextIndent && !isNaN(nextNumber)) {
					if (newNumber === nextNumber) itemNumber = nextNumber + 1;
					if (newNumber > nextNumber) itemNumber = newNumber + 1;
					cm.replaceRange(
						nextLine.replace(listRE, nextIndent + itemNumber + nextItem[4] + nextItem[5]),
					{
						line: nextLineNumber, ch: 0
					}, {
						line: nextLineNumber, ch: nextLine.length
					});
				} else {
					if (startIndent.length > nextIndent.length) return;
					// This doesn't run if the next line immediately indents, as it is
					// not clear of the users intention (new indented item or same level)
					if ((startIndent.length < nextIndent.length) && (lookAhead === 1)) return;
					skipCount += 1;
				}
			}
		} while (nextItem);
	}
});

// #END
