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+/*
+ * emccpre.js: one of the Javascript components of an Emscripten-based
+ * web/Javascript front end for Puzzles.
+ *
+ * The other parts of this system live in emcc.c and emcclib.js. It
+ * also depends on being run in the context of a web page containing
+ * an appropriate collection of bits and pieces (a canvas, some
+ * buttons and links etc), which is generated for each puzzle by the
+ * script html/jspage.pl.
+ *
+ * This file contains the Javascript code which is prefixed unmodified
+ * to Emscripten's output via the --pre-js option. It declares all our
+ * global variables, and provides the puzzle init function and a
+ * couple of other helper functions.
+ */
+
+// To avoid flicker while doing complicated drawing, we use two
+// canvases, the same size. One is actually on the web page, and the
+// other is off-screen. We do all our drawing on the off-screen one
+// first, and then copy rectangles of it to the on-screen canvas in
+// response to draw_update() calls by the game backend.
+var onscreen_canvas, offscreen_canvas;
+
+// A persistent drawing context for the offscreen canvas, to save
+// constructing one per individual graphics operation.
+var ctx;
+
+// Bounding rectangle for the copy to the onscreen canvas that will be
+// done at drawing end time. Updated by js_canvas_draw_update and used
+// by js_canvas_end_draw.
+var update_xmin, update_xmax, update_ymin, update_ymax;
+
+// Module object for Emscripten. We fill in these parameters to ensure
+// that Module.run() won't be called until we're ready (we want to do
+// our own init stuff first), and that when main() returns nothing
+// will get cleaned up so we remain able to call the puzzle's various
+// callbacks.
+var Module = {
+    'noInitialRun': true,
+    'noExitRuntime': true
+};
+
+// Variables used by js_canvas_find_font_midpoint().
+var midpoint_test_str = "ABCDEFGHIKLMNOPRSTUVWXYZ0123456789";
+var midpoint_cache = [];
+
+// Variables used by js_activate_timer() and js_deactivate_timer().
+var timer = null;
+var timer_reference_date;
+
+// void timer_callback(double tplus);
+//
+// Called every 20ms while timing is active.
+var timer_callback;
+
+// The status bar object, if we create one.
+var statusbar = null;
+
+// Currently live blitters. We keep an integer id for each one on the
+// JS side; the C side, which expects a blitter to look like a struct,
+// simply defines the struct to contain that integer id.
+var blittercount = 0;
+var blitters = [];
+
+// State for the dialog-box mechanism. dlg_dimmer and dlg_form are the
+// page-darkening overlay and the actual dialog box respectively;
+// dlg_next_id is used to allocate each checkbox a unique id to use
+// for linking its label to it (see js_dialog_boolean);
+// dlg_return_funcs is a list of JS functions to be called when the OK
+// button is pressed, to pass the results back to C.
+var dlg_dimmer = null, dlg_form = null;
+var dlg_next_id = 0;
+var dlg_return_funcs = null;
+
+// void dlg_return_sval(int index, const char *val);
+// void dlg_return_ival(int index, int val);
+//
+// C-side entry points called by functions in dlg_return_funcs, to
+// pass back the final value in each dialog control.
+var dlg_return_sval, dlg_return_ival;
+
+// The <ul> object implementing the game-type drop-down, and a list of
+// the <li> objects inside it. Used by js_add_preset(),
+// js_get_selected_preset() and js_select_preset().
+var gametypelist = null, gametypeitems = [];
+var gametypeselectedindex = null;
+var gametypesubmenus = [];
+
+// The two anchors used to give permalinks to the current puzzle. Used
+// by js_update_permalinks().
+var permalink_seed, permalink_desc;
+
+// The undo and redo buttons. Used by js_enable_undo_redo().
+var undo_button, redo_button;
+
+// A div element enclosing both the puzzle and its status bar, used
+// for positioning the resize handle.
+var resizable_div;
+
+// Helper function to find the absolute position of a given DOM
+// element on a page, by iterating upwards through the DOM finding
+// each element's offset from its parent, and thus calculating the
+// page-relative position of the target element.
+function element_coords(element) {
+    var ex = 0, ey = 0;
+    while (element.offsetParent) {
+        ex += element.offsetLeft;
+        ey += element.offsetTop;
+        element = element.offsetParent;
+    }
+    return {x: ex, y:ey};
+}
+
+// Helper function which is passed a mouse event object and a DOM
+// element, and returns the coordinates of the mouse event relative to
+// the top left corner of the element by subtracting element_coords
+// from event.page{X,Y}.
+function relative_mouse_coords(event, element) {
+    var ecoords = element_coords(element);
+    return {x: event.pageX - ecoords.x,
+            y: event.pageY - ecoords.y};
+}
+
+// Enable and disable items in the CSS menus.
+function disable_menu_item(item, disabledFlag) {
+    if (disabledFlag)
+        item.className = "disabled";
+    else
+        item.className = "";
+}
+
+// Init function called from body.onload.
+function initPuzzle() {
+    // Construct the off-screen canvas used for double buffering.
+    onscreen_canvas = document.getElementById("puzzlecanvas");
+    offscreen_canvas = document.createElement("canvas");
+    offscreen_canvas.width = onscreen_canvas.width;
+    offscreen_canvas.height = onscreen_canvas.height;
+
+    // Stop right-clicks on the puzzle from popping up a context menu.
+    // We need those right-clicks!
+    onscreen_canvas.oncontextmenu = function(event) { return false; }
+
+    // Set up mouse handlers. We do a bit of tracking of the currently
+    // pressed mouse buttons, to avoid sending mousemoves with no
+    // button down (our puzzles don't want those events).
+    mousedown = Module.cwrap('mousedown', 'void',
+                             ['number', 'number', 'number']);
+    buttons_down = 0;
+    onscreen_canvas.onmousedown = function(event) {
+        var xy = relative_mouse_coords(event, onscreen_canvas);
+        mousedown(xy.x, xy.y, event.button);
+        buttons_down |= 1 << event.button;
+        onscreen_canvas.setCapture(true);
+    };
+    mousemove = Module.cwrap('mousemove', 'void',
+                             ['number', 'number', 'number']);
+    onscreen_canvas.onmousemove = function(event) {
+        if (buttons_down) {
+            var xy = relative_mouse_coords(event, onscreen_canvas);
+            mousemove(xy.x, xy.y, buttons_down);
+        }
+    };
+    mouseup = Module.cwrap('mouseup', 'void',
+                           ['number', 'number', 'number']);
+    onscreen_canvas.onmouseup = function(event) {
+        if (buttons_down & (1 << event.button)) {
+            buttons_down ^= 1 << event.button;
+            var xy = relative_mouse_coords(event, onscreen_canvas);
+            mouseup(xy.x, xy.y, event.button);
+        }
+    };
+
+    // Set up keyboard handlers. We do all the actual keyboard
+    // handling in onkeydown; but we also call event.preventDefault()
+    // in both the keydown and keypress handlers. This means that
+    // while the canvas itself has focus, _all_ keypresses go only to
+    // the puzzle - so users of this puzzle collection in other media
+    // can indulge their instinct to press ^R for redo, for example,
+    // without accidentally reloading the page.
+    key = Module.cwrap('key', 'void', ['number', 'number', 'string',
+                                       'string', 'number', 'number']);
+    onscreen_canvas.onkeydown = function(event) {
+        key(event.keyCode, event.charCode, event.key, event.char,
+            event.shiftKey ? 1 : 0, event.ctrlKey ? 1 : 0);
+        event.preventDefault();
+    };
+    onscreen_canvas.onkeypress = function(event) {
+        event.preventDefault();
+    };
+
+    // command() is a C function called to pass back events which
+    // don't fall into other categories like mouse and key events.
+    // Mostly those are button presses, but there's also one for the
+    // game-type dropdown having been changed.
+    command = Module.cwrap('command', 'void', ['number']);
+
+    // Event handlers for buttons and things, which call command().
+    document.getElementById("specific").onclick = function(event) {
+        // Ensure we don't accidentally process these events when a
+        // dialog is actually active, e.g. because the button still
+        // has keyboard focus
+        if (dlg_dimmer === null)
+            command(0);
+    };
+    document.getElementById("random").onclick = function(event) {
+        if (dlg_dimmer === null)
+            command(1);
+    };
+    document.getElementById("new").onclick = function(event) {
+        if (dlg_dimmer === null)
+            command(5);
+    };
+    document.getElementById("restart").onclick = function(event) {
+        if (dlg_dimmer === null)
+            command(6);
+    };
+    undo_button = document.getElementById("undo");
+    undo_button.onclick = function(event) {
+        if (dlg_dimmer === null)
+            command(7);
+    };
+    redo_button = document.getElementById("redo");
+    redo_button.onclick = function(event) {
+        if (dlg_dimmer === null)
+            command(8);
+    };
+    document.getElementById("solve").onclick = function(event) {
+        if (dlg_dimmer === null)
+            command(9);
+    };
+
+    gametypelist = document.getElementById("gametype");
+    gametypesubmenus.push(gametypelist);
+
+    // In IE, the canvas doesn't automatically gain focus on a mouse
+    // click, so make sure it does
+    onscreen_canvas.addEventListener("mousedown", function(event) {
+        onscreen_canvas.focus();
+    });
+
+    // In our dialog boxes, Return and Escape should be like pressing
+    // OK and Cancel respectively
+    document.addEventListener("keydown", function(event) {
+
+        if (dlg_dimmer !== null && event.keyCode == 13) {
+            for (var i in dlg_return_funcs)
+                dlg_return_funcs[i]();
+            command(3);
+        }
+
+        if (dlg_dimmer !== null && event.keyCode == 27)
+            command(4);
+    });
+
+    // Set up the function pointers we haven't already grabbed. 
+    dlg_return_sval = Module.cwrap('dlg_return_sval', 'void',
+                                   ['number','string']);
+    dlg_return_ival = Module.cwrap('dlg_return_ival', 'void',
+                                   ['number','number']);
+    timer_callback = Module.cwrap('timer_callback', 'void', ['number']);
+
+    // Save references to the two permalinks.
+    permalink_desc = document.getElementById("permalink-desc");
+    permalink_seed = document.getElementById("permalink-seed");
+
+    // Default to giving keyboard focus to the puzzle.
+    onscreen_canvas.focus();
+
+    // Create the resize handle.
+    var resize_handle = document.createElement("canvas");
+    resize_handle.width = 10;
+    resize_handle.height = 10;
+    {
+        var ctx = resize_handle.getContext("2d");
+        ctx.beginPath();
+        for (var i = 1; i <= 7; i += 3) {
+            ctx.moveTo(8.5, i + 0.5);
+            ctx.lineTo(i + 0.5, 8.5);
+        }
+        ctx.lineWidth = '1px';
+        ctx.lineCap = 'round';
+        ctx.lineJoin = 'round';
+        ctx.strokeStyle = '#000000';
+        ctx.stroke();
+    }
+    resizable_div = document.getElementById("resizable");
+    resizable_div.appendChild(resize_handle);
+    resize_handle.style.position = 'absolute';
+    resize_handle.style.zIndex = 98;
+    resize_handle.style.bottom = "0";
+    resize_handle.style.right = "0";
+    resize_handle.style.cursor = "se-resize";
+    resize_handle.title = "Drag to resize the puzzle. Right-click to restore the default size.";
+    var resize_xbase = null, resize_ybase = null, restore_pending = false;
+    var resize_xoffset = null, resize_yoffset = null;
+    var resize_puzzle = Module.cwrap('resize_puzzle',
+                                     'void', ['number', 'number']);
+    var restore_puzzle_size = Module.cwrap('restore_puzzle_size', 'void', []);
+    resize_handle.oncontextmenu = function(event) { return false; }
+    resize_handle.onmousedown = function(event) {
+        if (event.button == 0) {
+            var xy = element_coords(onscreen_canvas);
+            resize_xbase = xy.x + onscreen_canvas.width / 2;
+            resize_ybase = xy.y;
+            resize_xoffset = xy.x + onscreen_canvas.width - event.pageX;
+            resize_yoffset = xy.y + onscreen_canvas.height - event.pageY;
+        } else {
+            restore_pending = true;
+        }
+        resize_handle.setCapture(true);
+        event.preventDefault();
+    };
+    window.addEventListener("mousemove", function(event) {
+        if (resize_xbase !== null && resize_ybase !== null) {
+            resize_puzzle((event.pageX + resize_xoffset - resize_xbase) * 2,
+                          (event.pageY + resize_yoffset - resize_ybase));
+            event.preventDefault();
+            // Chrome insists on selecting text during a resize drag
+            // no matter what I do
+            if (window.getSelection)
+                window.getSelection().removeAllRanges();
+            else
+                document.selection.empty();        }
+    });
+    window.addEventListener("mouseup", function(event) {
+        if (resize_xbase !== null && resize_ybase !== null) {
+            resize_xbase = null;
+            resize_ybase = null;
+            onscreen_canvas.focus(); // return focus to the puzzle
+            event.preventDefault();
+        } else if (restore_pending) {
+            // If you have the puzzle at larger than normal size and
+            // then right-click to restore, I haven't found any way to
+            // stop Chrome and IE popping up a context menu on the
+            // revealed piece of document when you release the button
+            // except by putting the actual restore into a setTimeout.
+            // Gah.
+            setTimeout(function() {
+                restore_pending = false;
+                restore_puzzle_size();
+                onscreen_canvas.focus();
+            }, 20);
+            event.preventDefault();
+        }
+    });
+
+    // Run the C setup function, passing argv[1] as the fragment
+    // identifier (so that permalinks of the form puzzle.html#game-id
+    // can launch the specified id).
+    Module.callMain([location.hash]);
+
+    // And if we get here with everything having gone smoothly, i.e.
+    // we haven't crashed for one reason or another during setup, then
+    // it's probably safe to hide the 'sorry, no puzzle here' div and
+    // show the div containing the actual puzzle.
+    document.getElementById("apology").style.display = "none";
+    document.getElementById("puzzle").style.display = "inline";
+}