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#import <WebKit/npapi.h>
#import <WebKit/npfunctions.h>
#import <WebKit/npruntime.h>

#import <Cocoa/Cocoa.h>

#import "MenuHandler.h"

// Browser function table
static NPNetscapeFuncs* browser;

// Structure for per-instance storage
typedef struct PluginObject
{
    NPP npp;
    
    NPWindow window;
    
    NSString *string;
    bool hasFocus;
    bool mouseIsInsidePlugin;
    
    MenuHandler *menuHandler;
} PluginObject;

NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16_t mode, int16_t argc, char* argn[], char* argv[], NPSavedData* saved);
NPError NPP_Destroy(NPP instance, NPSavedData** save);
NPError NPP_SetWindow(NPP instance, NPWindow* window);
NPError NPP_NewStream(NPP instance, NPMIMEType type, NPStream* stream, NPBool seekable, uint16_t* stype);
NPError NPP_DestroyStream(NPP instance, NPStream* stream, NPReason reason);
int32_t NPP_WriteReady(NPP instance, NPStream* stream);
int32_t NPP_Write(NPP instance, NPStream* stream, int32_t offset, int32_t len, void* buffer);
void NPP_StreamAsFile(NPP instance, NPStream* stream, const char* fname);
void NPP_Print(NPP instance, NPPrint* platformPrint);
int16_t NPP_HandleEvent(NPP instance, void* event);
void NPP_URLNotify(NPP instance, const char* URL, NPReason reason, void* notifyData);
NPError NPP_GetValue(NPP instance, NPPVariable variable, void *value);
NPError NPP_SetValue(NPP instance, NPNVariable variable, void *value);

#pragma export on
// Mach-o entry points
NPError NP_Initialize(NPNetscapeFuncs *browserFuncs);
NPError NP_GetEntryPoints(NPPluginFuncs *pluginFuncs);
void NP_Shutdown(void);
#pragma export off

NPError NP_Initialize(NPNetscapeFuncs* browserFuncs)
{
    browser = browserFuncs;
    return NPERR_NO_ERROR;
}

NPError NP_GetEntryPoints(NPPluginFuncs* pluginFuncs)
{
    pluginFuncs->version = 11;
    pluginFuncs->size = sizeof(pluginFuncs);
    pluginFuncs->newp = NPP_New;
    pluginFuncs->destroy = NPP_Destroy;
    pluginFuncs->setwindow = NPP_SetWindow;
    pluginFuncs->newstream = NPP_NewStream;
    pluginFuncs->destroystream = NPP_DestroyStream;
    pluginFuncs->asfile = NPP_StreamAsFile;
    pluginFuncs->writeready = NPP_WriteReady;
    pluginFuncs->write = (NPP_WriteProcPtr)NPP_Write;
    pluginFuncs->print = NPP_Print;
    pluginFuncs->event = NPP_HandleEvent;
    pluginFuncs->urlnotify = NPP_URLNotify;
    pluginFuncs->getvalue = NPP_GetValue;
    pluginFuncs->setvalue = NPP_SetValue;
    
    return NPERR_NO_ERROR;
}

void NP_Shutdown(void)
{

}

NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16_t mode, int16_t argc, char* argn[], char* argv[], NPSavedData* saved)
{
    // Create per-instance storage
    PluginObject *obj = (PluginObject *)malloc(sizeof(PluginObject));
    bzero(obj, sizeof(PluginObject));
    
    obj->npp = instance;
    instance->pdata = obj;
    
    // Ask the browser if it supports the CoreGraphics drawing model
    NPBool supportsCoreGraphics;
    if (browser->getvalue(instance, NPNVsupportsCoreGraphicsBool, &supportsCoreGraphics) != NPERR_NO_ERROR)
        supportsCoreGraphics = FALSE;
    
    if (!supportsCoreGraphics)
        return NPERR_INCOMPATIBLE_VERSION_ERROR;
    
    // If the browser supports the CoreGraphics drawing model, enable it.
    browser->setvalue(instance, NPPVpluginDrawingModel, (void *)NPDrawingModelCoreGraphics);

    // If the browser supports the Cocoa event model, enable it.
    NPBool supportsCocoa;
    if (browser->getvalue(instance, NPNVsupportsCocoaBool, &supportsCocoa) != NPERR_NO_ERROR)
        supportsCocoa = FALSE;
    
    if (!supportsCocoa)
        return NPERR_INCOMPATIBLE_VERSION_ERROR;
    
    browser->setvalue(instance, NPPVpluginEventModel, (void *)NPEventModelCocoa);
    
    return NPERR_NO_ERROR;
}

NPError NPP_Destroy(NPP instance, NPSavedData** save)
{
    // Free per-instance storage
    PluginObject *obj = instance->pdata;
    
    [obj->string release];
    [obj->menuHandler release];
    
    free(obj);
    
    return NPERR_NO_ERROR;
}

NPError NPP_SetWindow(NPP instance, NPWindow* window)
{
    PluginObject *obj = instance->pdata;
    obj->window = *window;

    return NPERR_NO_ERROR;
}
 

NPError NPP_NewStream(NPP instance, NPMIMEType type, NPStream* stream, NPBool seekable, uint16_t* stype)
{
    *stype = NP_ASFILEONLY;
    return NPERR_NO_ERROR;
}

NPError NPP_DestroyStream(NPP instance, NPStream* stream, NPReason reason)
{
    return NPERR_NO_ERROR;
}

int32_t NPP_WriteReady(NPP instance, NPStream* stream)
{
    return 0;
}

int32_t NPP_Write(NPP instance, NPStream* stream, int32_t offset, int32_t len, void* buffer)
{
    return 0;
}

void NPP_StreamAsFile(NPP instance, NPStream* stream, const char* fname)
{
}

void NPP_Print(NPP instance, NPPrint* platformPrint)
{

}

static void handleDraw(PluginObject *obj, NPCocoaEvent *event)
{
    NSGraphicsContext *oldContext = [[NSGraphicsContext currentContext] retain];
    
    NSGraphicsContext *context = [NSGraphicsContext graphicsContextWithGraphicsPort:event->data.draw.context
                                                                            flipped:YES];

    [NSGraphicsContext setCurrentContext:context];
    
    NSRect rect = NSMakeRect(0, 0, obj->window.width, obj->window.height);
    
    [[NSColor lightGrayColor] set];
    [NSBezierPath fillRect:rect];

    // If the plugin has focus, draw a focus indicator
    if (obj->hasFocus) {
        [[NSColor blackColor] set];
        NSBezierPath *path = [NSBezierPath bezierPathWithRect:rect];
        [path setLineWidth:5];
        [path stroke];
    }
    
    [obj->string drawAtPoint:NSMakePoint(10, 10) withAttributes:nil];
    
    [NSGraphicsContext setCurrentContext:oldContext];
}

static NSString *eventType(NPCocoaEventType type)
{
    switch (type) {
        case NPCocoaEventScrollWheel:
            return @"NPCocoaEventScrollWheel";
        case NPCocoaEventMouseDown:
            return @"NPCocoaEventMouseDown";
        case NPCocoaEventMouseUp:
            return @"NPCocoaEventMouseUp";            
        case NPCocoaEventMouseMoved:
            return @"NPCocoaEventMouseMoved";            
        case NPCocoaEventMouseDragged:
            return @"NPCocoaEventMouseDragged";            
        case NPCocoaEventMouseEntered:
            return @"NPCocoaEventMouseEntered";            
        case NPCocoaEventMouseExited:
            return @"NPCocoaEventMouseExited";
        case NPCocoaEventKeyDown:
            return @"NPCocoaEventKeyDown";
        case NPCocoaEventKeyUp:
            return @"NPCocoaEventKeyUp";
        case NPCocoaEventFlagsChanged:
            return @"NPCocoaEventFlagsChanged";
        default:
            return @"unknown";
    }    
}

static void invalidatePlugin(PluginObject *obj)
{
    NPRect rect;
    rect.left = 0;
    rect.top = 0;
    rect.right = obj->window.width;
    rect.bottom = obj->window.height;
    
    browser->invalidaterect(obj->npp, &rect);    
}


static void handleMouseEvent(PluginObject *obj, NPCocoaEvent *event)
{
    NSString *string = [NSString stringWithFormat:@"Type: %@\n"
                                                   "Modifier flags: 0x%x\n"
                                                   "Coordinates: (%g, %g)\n"
                                                   "Button number: %d\n"
                                                   "Click count: %d\n"
                                                   "Delta: (%g, %g, %g)",
                                                   eventType(event->type), 
                                                   event->data.mouse.modifierFlags,
                                                   event->data.mouse.pluginX,
                                                   event->data.mouse.pluginY,
                                                   event->data.mouse.buttonNumber,
                                                   event->data.mouse.clickCount,
                                                   event->data.mouse.deltaX, event->data.mouse.deltaY, event->data.mouse.deltaZ];
    
    
    [obj->string release];
    obj->string = [string retain];
 
    invalidatePlugin(obj);
    
    if (event->data.mouse.buttonNumber == 1) {
        if (!obj->menuHandler)
            obj->menuHandler = [[MenuHandler alloc] initWithBrowserFuncs:browser instance:obj->npp];
        
        browser->popupcontextmenu(obj->npp, (NPNSMenu *)[obj->menuHandler menu]);
    }
}

static void handleKeyboardEvent(PluginObject *obj, NPCocoaEvent *event)
{
    NSString *string = [NSString stringWithFormat:@"Type: %@\n"
                        "Modifier flags: 0x%x\n"
                        "Characters: %@\n"
                        "Characters ignoring modifiers: %@\n"
                        "Is a repeat: %@\n"
                        "Key code: %d",
                        eventType(event->type), 
                        event->data.key.modifierFlags,
                        event->data.key.characters,
                        event->data.key.charactersIgnoringModifiers,
                        event->data.key.isARepeat ? @"YES" : @"NO",
                        event->data.key.keyCode];
    
    
    [obj->string release];
    obj->string = [string retain];
    
    invalidatePlugin(obj);
}

int16_t NPP_HandleEvent(NPP instance, void* event)
{
    PluginObject *obj = instance->pdata;

    NPCocoaEvent *cocoaEvent = event;
    
    switch(cocoaEvent->type) {
        case NPCocoaEventFocusChanged:
            obj->hasFocus = cocoaEvent->data.focus.hasFocus;
            invalidatePlugin(obj);
            return 1;
            
        case NPCocoaEventDrawRect:
            handleDraw(obj, cocoaEvent);
            return 1;
        
        case NPCocoaEventKeyDown:
        case NPCocoaEventKeyUp:
        case NPCocoaEventFlagsChanged:
            handleKeyboardEvent(obj, cocoaEvent);
            return 1;
            
        case NPCocoaEventMouseDown:
        case NPCocoaEventMouseUp:
            
        // FIXME: NPCocoaEventMouseMoved is currently disabled in order to see other events more clearly
        // without "drowning" in mouse moved events.
//        case NPCocoaEventMouseMoved:
        case NPCocoaEventMouseEntered:
        case NPCocoaEventMouseExited:
        case NPCocoaEventMouseDragged:
        case NPCocoaEventScrollWheel:
            handleMouseEvent(obj, cocoaEvent);
            return 1;
    }
    
    return 0;
}

void NPP_URLNotify(NPP instance, const char* url, NPReason reason, void* notifyData)
{

}

NPError NPP_GetValue(NPP instance, NPPVariable variable, void *value)
{
    return NPERR_GENERIC_ERROR;
}

NPError NPP_SetValue(NPP instance, NPNVariable variable, void *value)
{
    return NPERR_GENERIC_ERROR;
}