// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/LICENSE

// Define search commands. Depends on dialog.js or another
// implementation of the openDialog method.

// Replace works a little oddly -- it will do the replace on the next
// Ctrl-G (or whatever is bound to findNext) press. You prevent a
// replace by making sure the match is no longer selected when hitting
// Ctrl-G.

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

    // default search panel location
    CodeMirror.defineOption("search", { bottom: false });

    function searchOverlay(query, caseInsensitive) {
        if (typeof query == "string")
            query = new RegExp(query.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&"), caseInsensitive ? "gi" : "g");
        else if (!query.global)
            query = new RegExp(query.source, query.ignoreCase ? "gi" : "g");

        return {
            token: function (stream) {
                query.lastIndex = stream.pos;
                var match = query.exec(stream.string);
                if (match && match.index == stream.pos) {
                    stream.pos += match[0].length || 1;
                    return "searching";
                } else if (match) {
                    stream.pos = match.index;
                } else {
                    stream.skipToEnd();
                }
            }
        };
    }

    function SearchState() {
        this.posFrom = this.posTo = this.lastQuery = this.query = null;
        this.overlay = null;
    }

    function getSearchState(cm) {
        return cm.state.search || (cm.state.search = new SearchState());
    }

    function queryCaseInsensitive(query) {
        return typeof query == "string" && query == query.toLowerCase();
    }

    function getSearchCursor(cm, query, pos) {
        // Heuristic: if the query string is all lowercase, do a case insensitive search.
        return cm.getSearchCursor(query, pos, { caseFold: queryCaseInsensitive(query), multiline: true });
    }

    function persistentDialog(cm, text, deflt, onEnter, onKeyDown) {
        cm.openDialog(text, onEnter, {
            value: deflt,
            selectValueOnOpen: true,
            closeOnEnter: false,
            onClose: function () { clearSearch(cm); },
            onKeyDown: onKeyDown,
            bottom: cm.options.search.bottom
        });
    }

    function dialog(cm, text, shortText, deflt, f) {
        if (cm.openDialog) cm.openDialog(text, f, { value: deflt, selectValueOnOpen: true, bottom: cm.options.search.bottom });
        else f(prompt(shortText, deflt));
    }

    function confirmDialog(cm, text, shortText, fs) {
        if (cm.openConfirm) cm.openConfirm(text, fs);
        else if (confirm(shortText)) fs[0]();
    }

    function parseString(string) {
        return string.replace(/\\([nrt\\])/g, function (match, ch) {
            if (ch == "n") return "\n";
            if (ch == "r") return "\r";
            if (ch == "t") return "\t";
            if (ch == "\\") return "\\";
            return match;
        });
    }

    function parseQuery(query) {
        var isRE = query.match(/^\/(.*)\/([a-z]*)$/);
        if (isRE) {
            try { query = new RegExp(isRE[1], isRE[2].indexOf("i") == -1 ? "" : "i"); }
            catch (e) { } // Not a regular expression after all, do a string search
        } else {
            query = parseString(query);
        }
        if (typeof query == "string" ? query == "" : query.test(""))
            query = /x^/;
        return query;
    }

    function startSearch(cm, state, query) {
        state.queryText = query;
        state.query = parseQuery(query);
        cm.removeOverlay(state.overlay, queryCaseInsensitive(state.query));
        state.overlay = searchOverlay(state.query, queryCaseInsensitive(state.query));
        cm.addOverlay(state.overlay);
        if (cm.showMatchesOnScrollbar) {
            if (state.annotate) { state.annotate.clear(); state.annotate = null; }
            state.annotate = cm.showMatchesOnScrollbar(state.query, queryCaseInsensitive(state.query));
        }
    }

    function doSearch(cm, rev, persistent, immediate) {
        var state = getSearchState(cm);
        if (state.query) return findNext(cm, rev);
        var q = cm.getSelection() || state.lastQuery;
        if (q instanceof RegExp && q.source == "x^") q = null;
        if (persistent && cm.openDialog) {
            var hiding = null;
            var searchNext = function (query, event) {
                CodeMirror.e_stop(event);
                if (!query) return;
                if (query != state.queryText) {
                    startSearch(cm, state, query);
                    state.posFrom = state.posTo = cm.getCursor();
                }
                if (hiding) hiding.style.opacity = 1;
                findNext(cm, event.shiftKey, function (_, to) {
                    var dialog;
                    if (to.line < 3 && document.querySelector &&
                        (dialog = cm.display.wrapper.querySelector(".CodeMirror-dialog")) &&
                        dialog.getBoundingClientRect().bottom - 4 > cm.cursorCoords(to, "window").top)
                        (hiding = dialog).style.opacity = .4;
                });
            };
            persistentDialog(cm, getQueryDialog(cm), q, searchNext, function (event, query) {
                var keyName = CodeMirror.keyName(event);
                var extra = cm.getOption('extraKeys'), cmd = (extra && extra[keyName]) || CodeMirror.keyMap[cm.getOption("keyMap")][keyName];
                if (cmd == "findNext" || cmd == "findPrev" ||
                    cmd == "findPersistentNext" || cmd == "findPersistentPrev") {
                    CodeMirror.e_stop(event);
                    startSearch(cm, getSearchState(cm), query);
                    cm.execCommand(cmd);
                } else if (cmd == "find" || cmd == "findPersistent") {
                    CodeMirror.e_stop(event);
                    searchNext(query, event);
                }
            });
            if (immediate && q) {
                startSearch(cm, state, q);
                findNext(cm, rev);
            }
        } else {
            dialog(cm, getQueryDialog(cm), "Search for:", q, function (query) {
                if (query && !state.query) cm.operation(function () {
                    startSearch(cm, state, query);
                    state.posFrom = state.posTo = cm.getCursor();
                    findNext(cm, rev);
                });
            });
        }
    }

    function findNext(cm, rev, callback) {
        cm.operation(function () {
            var state = getSearchState(cm);
            var cursor = getSearchCursor(cm, state.query, rev ? state.posFrom : state.posTo);
            if (!cursor.find(rev)) {
                cursor = getSearchCursor(cm, state.query, rev ? CodeMirror.Pos(cm.lastLine()) : CodeMirror.Pos(cm.firstLine(), 0));
                if (!cursor.find(rev)) return;
            }
            cm.setSelection(cursor.from(), cursor.to());
            cm.scrollIntoView({ from: cursor.from(), to: cursor.to() }, 20);
            state.posFrom = cursor.from(); state.posTo = cursor.to();
            if (callback) callback(cursor.from(), cursor.to());
        });
    }

    function clearSearch(cm) {
        cm.operation(function () {
            var state = getSearchState(cm);
            state.lastQuery = state.query;
            if (!state.query) return;
            state.query = state.queryText = null;
            cm.removeOverlay(state.overlay);
            if (state.annotate) { state.annotate.clear(); state.annotate = null; }
        });
    }

    function el(tag, attrs) {
        var element = tag ? document.createElement(tag) : document.createDocumentFragment();
        for (var key in attrs) {
            element[key] = attrs[key];
        }
        for (var i = 2; i < arguments.length; i++) {
            var child = arguments[i];
            element.appendChild(typeof child == "string" ? document.createTextNode(child) : child);
        }
        return element;
    }

    function getQueryDialog(cm) {
        var label = el("label", { className: "CodeMirror-search-label" },
            cm.phrase("Search:"),
            el("input", {
                type: "text", "style": "width: 10em", className: "CodeMirror-search-field",
                id: "CodeMirror-search-field"
            }));
        label.setAttribute("for", "CodeMirror-search-field");
        return el("", null, label, " ",
            el("span", { style: "color: #666", className: "CodeMirror-search-hint" },
                cm.phrase("(Use /re/ syntax for regexp search)")));
    }
    function getReplaceQueryDialog(cm) {
        return el("", null, " ",
            el("input", { type: "text", "style": "width: 10em", className: "CodeMirror-search-field" }), " ",
            el("span", { style: "color: #666", className: "CodeMirror-search-hint" },
                cm.phrase("(Use /re/ syntax for regexp search)")));
    }
    function getReplacementQueryDialog(cm) {
        return el("", null,
            el("span", { className: "CodeMirror-search-label" }, cm.phrase("With:")), " ",
            el("input", { type: "text", "style": "width: 10em", className: "CodeMirror-search-field" }));
    }
    function getDoReplaceConfirm(cm) {
        return el("", null,
            el("span", { className: "CodeMirror-search-label" }, cm.phrase("Replace?")), " ",
            el("button", {}, cm.phrase("Yes")), " ",
            el("button", {}, cm.phrase("No")), " ",
            el("button", {}, cm.phrase("All")), " ",
            el("button", {}, cm.phrase("Stop")));
    }

    function replaceAll(cm, query, text) {
        cm.operation(function () {
            for (var cursor = getSearchCursor(cm, query); cursor.findNext();) {
                if (typeof query != "string") {
                    var match = cm.getRange(cursor.from(), cursor.to()).match(query);
                    cursor.replace(text.replace(/\$(\d)/g, function (_, i) { return match[i]; }));
                } else cursor.replace(text);
            }
        });
    }

    function replace(cm, all) {
        if (cm.getOption("readOnly")) return;
        var query = cm.getSelection() || getSearchState(cm).lastQuery;
        var dialogText = all ? cm.phrase("Replace all:") : cm.phrase("Replace:");
        var fragment = el("", null,
            el("span", { className: "CodeMirror-search-label" }, dialogText),
            getReplaceQueryDialog(cm));
        dialog(cm, fragment, dialogText, query, function (query) {
            if (!query) return;
            query = parseQuery(query);
            dialog(cm, getReplacementQueryDialog(cm), cm.phrase("Replace with:"), "", function (text) {
                text = parseString(text);
                if (all) {
                    replaceAll(cm, query, text);
                } else {
                    clearSearch(cm);
                    var cursor = getSearchCursor(cm, query, cm.getCursor("from"));
                    var advance = function () {
                        var start = cursor.from(), match;
                        if (!(match = cursor.findNext())) {
                            cursor = getSearchCursor(cm, query);
                            if (!(match = cursor.findNext()) ||
                                (start && cursor.from().line == start.line && cursor.from().ch == start.ch)) return;
                        }
                        cm.setSelection(cursor.from(), cursor.to());
                        cm.scrollIntoView({ from: cursor.from(), to: cursor.to() });
                        confirmDialog(cm, getDoReplaceConfirm(cm), cm.phrase("Replace?"),
                            [function () { doReplace(match); }, advance,
                            function () { replaceAll(cm, query, text); }]);
                    };
                    var doReplace = function (match) {
                        cursor.replace(typeof query == "string" ? text :
                            text.replace(/\$(\d)/g, function (_, i) { return match[i]; }));
                        advance();
                    };
                    advance();
                }
            });
        });
    }

    CodeMirror.commands.find = function (cm) { clearSearch(cm); doSearch(cm); };
    CodeMirror.commands.findPersistent = function (cm) { clearSearch(cm); doSearch(cm, false, true); };
    CodeMirror.commands.findPersistentNext = function (cm) { doSearch(cm, false, true, true); };
    CodeMirror.commands.findPersistentPrev = function (cm) { doSearch(cm, true, true, true); };
    CodeMirror.commands.findNext = doSearch;
    CodeMirror.commands.findPrev = function (cm) { doSearch(cm, true); };
    CodeMirror.commands.clearSearch = clearSearch;
    CodeMirror.commands.replace = replace;
    CodeMirror.commands.replaceAll = function (cm) { replace(cm, true); };
});
