/*  DokuWiki MoaiEditor Matches.js file
    Version : 0.5 (May 5, 2026)
    Author  : MoaiTools <info@moaitools.org>
    License : GPL 3 (http://www.gnu.org/licenses/gpl.html) */

MoaiEditor.Matches = class {

    constructor(outer) {
    
        // Handles
        
        // Settings
        this.settings = {show:{scrollpoints:false}}; 
        
        // Variables
        this.matches = [];          // array of {type, id, handle, startline, endline, syntax, scroll:{top,bottom}}
        this.newMatches = [];       // newly discovered matches after a preview update (equal to 'this.matches' if partial preview is off)  
        this.startline = 0;         // First starting line to be parsed after the preview response has been received
        
        // Objects
        this.matcher = new MoaiEditor.Matcher(this);
    }
    // ┌───────────────────────────────────┐
    // │ Public                            │
    // └───────────────────────────────────┘
    
    add (type, handle, startline, endline, syntax=null) {
        const match = {
            type      : type,
            handle    : handle,
            id        : handle.id,
            startline : this.startline + startline,
            endline   : this.startline + endline,
            syntax    : syntax,
            scroll    : null,
        };
        this.matches.push(match);           // Global list of matches
        this.newMatches.push(match);        // Only new matches
    }
    // ──────────────────────────────────── 
    update(top, bottom) {
        this.start = Date.now();
        
        // Get current editor
        const editor = moaiEditor.editor.current;
        
        // Get the starting and ending line
        var startline = 0;
        if (top !== null)
            startline = top.endline + 1;
        this.startline = startline;
        var endline = editor.watcher.lines.length-1;
        if (bottom !== null)
            endline = bottom.startline-1;
        
        // Remove matches in the changed area
        this.removeMatches(startline, endline, true);
        
        // Run matcher
        this.newMatches = [];
        this.matcher.onAjax (top, bottom, startline, endline);
        
        // Sort matches by start line
        this.matches.sort((a, b) => (a.startline > b.startline) ? 1 : -1);
        
        // Let the editor process the newly found matches
        var start = Date.now();
        editor.onAjax(this.newMatches);
        
        // Calc scroll points of new matches
        for (let match of this.newMatches) {
            const top = editor.getLineRect(match.startline).top;
            const bottom = editor.getLineRect(match.endline).bottom;
            match.scroll = {top:top, bottom:bottom};
        }
        // Show scrollpoints (for debug)
        this.showScrollPoints('onAjax');

        const elapsed = Date.now() - start;
        this.measureFrameTime("🭎 MATCHES.ONAJAX (FRAME TIME)");
    }
    // ────────────────────────────────────     
    onTextChanged(change) {
        
        // Get current editor
        const editor = moaiEditor.editor.current;
        
        // Remove matches in the changed area
        var keep = [];
        const start = change.num.keepfirst;
        const end = change.index.keeplast-1;
        this.removeMatches(start, end);
        
        // Shift the line-numbers and scroll-points of the matches (below the changed zone)
        var shift = null;
        for (let match of this.matches) 
            if (match.startline >= change.index.keeplast) {
                // Shift line numbers
                match.startline += change.shift;
                match.endline += change.shift;
                // Shift the scroll positions
                if (match.scroll !== null) {
                    if (shift === null) 
                        shift = editor.getLineRect(match.startline).top - match.scroll.top;
                    match.scroll.top += shift;
                    match.scroll.bottom += shift; 
                }
            }
        // Show scrollpoints (for debug)
        this.showScrollPoints('onTextChanged');
    }
    // ──────────────────────────────────── 
    removeMatches(startline, endline, editor=false) {
        var keep = [];
        for (let match of this.matches)
            if (!this.collides(match, startline, endline))
                keep.push(match);
            else if (editor)
                moaiEditor.editor.current.removeMatches(match.startline, match.endline);
        this.matches = keep;
    }
    // ──────────────────────────────────── 
    collides(match, start, end) {
        if (match.startline >= start  &&  match.startline <= end)
            return true;
        if (match.endline >= start  &&  match.endline <= end)
            return true;
        if (start >= match.startline &&  start <= match.endline)
            return true;
        if (end >= match.startline &&  end <= match.endline)
            return true;
        return false;
    }
    // ──────────────────────────────────── 
    find(handle) {
        for (let match of this.matches)
            if (match.handle == handle)
                return match;
        return null;
    }
    // ──────────────────────────────────── 
    recalcScrollPoints(range=null) {
        /* @range can be:
         *   null       : to recalculate all scroll points (called when the editor size or font changes)
         *   {from, to} : to recalculate scroll points in a range of lines (called when CodeMirror viewport changes)
         */
        this.start = Date.now(); 
        const editor  = moaiEditor.editor.current;
        for (let match of this.matches) {
            if ( range !== null  &&  !this.collides(match, range.from, range.to) )
                continue;
            const top = editor.getLineRect(match.startline).top;
            const bottom = editor.getLineRect(match.endline).bottom;
            match.scroll = {top:top, bottom:bottom};
        }
    }
    // ──────────────────────────────────── 
    showScrollPoints(caller) {
        if (!this.settings.show.scrollpoints)
            return;
        const container = document.querySelector("#moaied__scrollpoints_overlay");
        container.style.display = 'block';
        container.innerHTML = '';
        const editor  = moaiEditor.editor.current;
        for (let match of this.matches) {
            const top = editor.getLineRect(match.startline).top;
            const bottom = editor.getLineRect(match.endline).bottom;
            var element = moaiEditor.createHTML('<div class="moaied-scrollpoint"></div>');
            element.style.top =  match.scroll.top+'px';
            element.style.height = (match.scroll.bottom - match.scroll.top)+'px';
            container.appendChild(element);
        }
    }
    // ────────────────────────────────────
    measureFrameTime (text) {
        requestAnimationFrame(() => {
            const elapsed = Date.now()-this.start;
        });
    }
}; // End Class