/*****************************************************************************
 * ExtensionsDialogProvider.m: Mac OS X Extensions Dialogs
 *****************************************************************************
 * Copyright (C) 2010-2015 VLC authors and VideoLAN
 * $Id: 7855d308928d657043f762d3af6b912ddd4aefb9 $
 *
 * Authors: Pierre d'Herbemont <pdherbemont # videolan org>
 *          Brendon Justin <brendonjustin@gmail.com>,
 *          Derk-Jan Hartman <hartman@videolan dot org>,
 *          Felix Paul Kühne <fkuehne@videolan dot org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#import "ExtensionsDialogProvider.h"

#import "intf.h"
#import "ExtensionsManager.h"
#import "misc.h"
#import "VLCUIWidgets.h"

#import <WebKit/WebKit.h>
#import <stdlib.h>

/*****************************************************************************
 * VLCExtensionsDialogProvider implementation
 *****************************************************************************/

static int dialogCallback(vlc_object_t *p_this, const char *psz_variable,
                           vlc_value_t old_val, vlc_value_t new_val,
                           void *param);

static NSView *createControlFromWidget(extension_widget_t *widget, id self)
{
    assert(!widget->p_sys_intf);
    switch (widget->type) {
        case EXTENSION_WIDGET_HTML:
        {
            WebView *webView = [[WebView alloc] initWithFrame:NSMakeRect (0,0,1,1)];
            [webView setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable];
            [webView setDrawsBackground:NO];
            return webView;
        }
        case EXTENSION_WIDGET_LABEL:
        {
            NSTextField *field = [[NSTextField alloc] init];
            [field setEditable:NO];
            [field setBordered:NO];
            [field setDrawsBackground:NO];
            [field setFont:[NSFont systemFontOfSize:0]];
            [[field cell] setControlSize:NSRegularControlSize];
            [field setAutoresizingMask:NSViewNotSizable];
            return field;
        }
        case EXTENSION_WIDGET_TEXT_FIELD:
        {
            VLCDialogTextField *field = [[VLCDialogTextField alloc] init];
            [field setWidget:widget];
            [field setAutoresizingMask:NSViewWidthSizable];
            [field setFont:[NSFont systemFontOfSize:0]];
            [[field cell] setControlSize:NSRegularControlSize];
            [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(syncTextField:)  name:NSControlTextDidChangeNotification object:field];
            return field;
        }
        case EXTENSION_WIDGET_CHECK_BOX:
        {
            VLCDialogButton *button = [[VLCDialogButton alloc] init];
            [button setButtonType:NSSwitchButton];
            [button setWidget:widget];
            [button setAction:@selector(triggerClick:)];
            [button setTarget:self];
            [[button cell] setControlSize:NSRegularControlSize];
            [button setAutoresizingMask:NSViewWidthSizable];
            return button;
        }
        case EXTENSION_WIDGET_BUTTON:
        {
            VLCDialogButton *button = [[VLCDialogButton alloc] init];
            [button setBezelStyle:NSRoundedBezelStyle];
            [button setWidget:widget];
            [button setAction:@selector(triggerClick:)];
            [button setTarget:self];
            [[button cell] setControlSize:NSRegularControlSize];
            [button setAutoresizingMask:NSViewNotSizable];
            return button;
        }
        case EXTENSION_WIDGET_DROPDOWN:
        {
            VLCDialogPopUpButton *popup = [[VLCDialogPopUpButton alloc] init];
            [popup setAction:@selector(popUpSelectionChanged:)];
            [popup setTarget:self];
            [popup setWidget:widget];
            return popup;
        }
        case EXTENSION_WIDGET_LIST:
        {
            NSScrollView *scrollView = [[NSScrollView alloc] init];
            [scrollView setHasVerticalScroller:YES];
            VLCDialogList *list = [[VLCDialogList alloc] init];
            [list setUsesAlternatingRowBackgroundColors:YES];
            [list setHeaderView:nil];
            [list setAllowsMultipleSelection:YES];
            [scrollView setDocumentView:list];
            [scrollView setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable];

            NSTableColumn *column = [[NSTableColumn alloc] init];
            [list addTableColumn:column];
            [column release];
            [list setDataSource:list];
            [list setDelegate:self];
            [list setWidget:widget];
            [list release];
            return scrollView;
        }
        case EXTENSION_WIDGET_IMAGE:
        {
            NSImageView *imageView = [[NSImageView alloc] init];
            [imageView setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable];
            [imageView setImageFrameStyle:NSImageFramePhoto];
            [imageView setImageScaling:NSImageScaleProportionallyUpOrDown];
            return imageView;
        }
        case EXTENSION_WIDGET_SPIN_ICON:
        {
            NSProgressIndicator *spinner = [[NSProgressIndicator alloc] init];
            [spinner setUsesThreadedAnimation:YES];
            [spinner setStyle:NSProgressIndicatorSpinningStyle];
            [spinner setDisplayedWhenStopped:YES];
            [spinner startAnimation:self];
            return spinner;
        }
        default:
            return nil;
    }

}

static void updateControlFromWidget(NSView *control, extension_widget_t *widget, id self)
{
    switch (widget->type) {
        case EXTENSION_WIDGET_HTML:
        {
            // Get the web view
            assert([control isKindOfClass:[WebView class]]);
            WebView *webView = (WebView *)control;
            NSString *string = [NSString stringWithUTF8String:widget->psz_text];
            [[webView mainFrame] loadHTMLString:string baseURL:[NSURL URLWithString:@""]];
            [webView setNeedsDisplay:YES];
            break;

        }
        {
            assert([control isKindOfClass:[NSTextView class]]);
            NSTextView *textView = (NSTextView *)control;
            NSString *string = [NSString stringWithUTF8String:widget->psz_text];
            NSAttributedString *attrString = [[NSAttributedString alloc] initWithHTML:[string dataUsingEncoding: NSISOLatin1StringEncoding] documentAttributes:NULL];
            [[textView textStorage] setAttributedString:attrString];
            [textView setNeedsDisplay:YES];
            [textView scrollRangeToVisible:NSMakeRange(0, 0)];
            [attrString release];
            break;

        }
        case EXTENSION_WIDGET_LABEL:
        case EXTENSION_WIDGET_PASSWORD:
        case EXTENSION_WIDGET_TEXT_FIELD:
        {
            if (!widget->psz_text)
                break;
            assert([control isKindOfClass:[NSControl class]]);
            NSControl *field = (NSControl *)control;
            NSString *string = [NSString stringWithCString:widget->psz_text encoding:NSUTF8StringEncoding];
            NSAttributedString *attrString = [[NSAttributedString alloc] initWithHTML:[string dataUsingEncoding: NSISOLatin1StringEncoding] documentAttributes:NULL];
            [field setAttributedStringValue:attrString];
            [attrString release];
            break;
        }
        case EXTENSION_WIDGET_CHECK_BOX:
        case EXTENSION_WIDGET_BUTTON:
        {
            assert([control isKindOfClass:[NSButton class]]);
            NSButton *button = (NSButton *)control;
            [button setTitle:toNSStr(widget->psz_text)];
            if (widget->type == EXTENSION_WIDGET_CHECK_BOX)
                [button setState:widget->b_checked ? NSOnState : NSOffState];
            break;
        }
        case EXTENSION_WIDGET_DROPDOWN:
        {
            assert([control isKindOfClass:[NSPopUpButton class]]);
            NSPopUpButton *popup = (NSPopUpButton *)control;
            [popup removeAllItems];
            struct extension_widget_value_t *value;
            for (value = widget->p_values; value != NULL; value = value->p_next)
                [[popup menu] addItemWithTitle:toNSStr(value->psz_text) action:nil keyEquivalent:@""];

            [popup synchronizeTitleAndSelectedItem];
            [self popUpSelectionChanged:popup];
            break;
        }
        case EXTENSION_WIDGET_LIST:
        {
            assert([control isKindOfClass:[NSScrollView class]]);
            NSScrollView *scrollView = (NSScrollView *)control;
            assert([[scrollView documentView] isKindOfClass:[VLCDialogList class]]);
            VLCDialogList *list = (VLCDialogList *)[scrollView documentView];

            NSMutableArray *contentArray = [NSMutableArray array];
            struct extension_widget_value_t *value;
            for (value = widget->p_values; value != NULL; value = value->p_next)
            {
                NSDictionary *entry = [NSDictionary dictionaryWithObjectsAndKeys:
                                       [NSNumber numberWithInt:value->i_id], @"id",
                                       [NSString stringWithUTF8String:value->psz_text], @"text",
                                       nil];
                [contentArray addObject:entry];
            }
            list.contentArray = contentArray;
            [list reloadData];
            break;
        }
        case EXTENSION_WIDGET_IMAGE:
        {
            assert([control isKindOfClass:[NSImageView class]]);
            NSImageView *imageView = (NSImageView *)control;
            NSString *string = widget->psz_text ? [NSString stringWithUTF8String:widget->psz_text] : nil;
            NSImage *image = nil;
            if (string)
                image = [[NSImage alloc] initWithContentsOfURL:[NSURL fileURLWithPath:string]];
            [imageView setImage:image];
            [image release];
            break;
        }
        case EXTENSION_WIDGET_SPIN_ICON:
        {
            assert([control isKindOfClass:[NSProgressIndicator class]]);
            NSProgressIndicator *progressIndicator = (NSProgressIndicator *)control;
            if (widget->i_spin_loops != 0)
                [progressIndicator startAnimation:self];
            else
                [progressIndicator stopAnimation:self];
            break;
        }
    }

}

/**
 * Ask the dialogs provider to create a new dialog
 **/
static int dialogCallback(vlc_object_t *p_this, const char *psz_variable,
                           vlc_value_t old_val, vlc_value_t new_val,
                           void *param)
{
    (void) p_this;
    (void) psz_variable;
    (void) old_val;
    (void) param;

    ExtensionsDialogProvider *p_edp = [ExtensionsDialogProvider sharedInstance:(intf_thread_t *)p_this];
    if (!p_edp)
        return VLC_EGENERIC;
    if (!new_val.p_address)
        return VLC_EGENERIC;

    extension_dialog_t *p_dialog = (extension_dialog_t*) new_val.p_address;
    [p_edp manageDialog:p_dialog];
    return VLC_SUCCESS;
}

@implementation ExtensionsDialogProvider

static ExtensionsDialogProvider *_o_sharedInstance = nil;

+ (ExtensionsDialogProvider *)sharedInstance:(intf_thread_t *)_p_intf
{
    return _o_sharedInstance ? _o_sharedInstance : [[self alloc] initWithIntf:_p_intf];
}

+ (void)killInstance
{
    if (_o_sharedInstance) {
        [_o_sharedInstance release];
    }
}

- (id)initWithIntf:(intf_thread_t *)_p_intf
{
    if (_o_sharedInstance)
        [self dealloc];

    if ((self = [super init])) {
        _o_sharedInstance = self;
        p_intf = _p_intf;

        // The Cocoa interface already called dialog_Register()
        var_Create(p_intf, "dialog-extension", VLC_VAR_ADDRESS);
        var_AddCallback(p_intf, "dialog-extension", dialogCallback, NULL);
    }

    return _o_sharedInstance;
}

- (void)dealloc
{
    msg_Dbg(p_intf, "ExtensionsDialogProvider is quitting...");
    var_DelCallback(p_intf, "dialog-extension", dialogCallback, NULL);

    [super dealloc];
}

- (void)performEventWithObject: (NSValue *)o_value ofType: (const char*)type
{
    NSString *o_type = [NSString stringWithUTF8String:type];

    if ([o_type isEqualToString: @"dialog-extension"]) {
        [self performSelectorOnMainThread:@selector(updateExtensionDialog:)
                               withObject:o_value
                            waitUntilDone:YES];

    }
    else
        msg_Err(VLCIntf, "unhandled dialog type: '%s'", type);
}

- (void)triggerClick:(id)sender
{
    assert([sender isKindOfClass:[VLCDialogButton class]]);
    VLCDialogButton *button = sender;
    extension_widget_t *widget = [button widget];

    vlc_mutex_lock(&widget->p_dialog->lock);
    if (widget->type == EXTENSION_WIDGET_BUTTON)
        extension_WidgetClicked(widget->p_dialog, widget);
    else
        widget->b_checked = [button state] == NSOnState;
    vlc_mutex_unlock(&widget->p_dialog->lock);
}

- (void)syncTextField:(NSNotification *)notifcation
{
    id sender = [notifcation object];
    assert([sender isKindOfClass:[VLCDialogTextField class]]);
    VLCDialogTextField *field = sender;
    extension_widget_t *widget = [field widget];

    vlc_mutex_lock(&widget->p_dialog->lock);
    free(widget->psz_text);
    widget->psz_text = strdup([[field stringValue] UTF8String]);
    vlc_mutex_unlock(&widget->p_dialog->lock);
}

- (void)tableViewSelectionDidChange:(NSNotification *)notifcation
{
    id sender = [notifcation object];
    assert(sender && [sender isKindOfClass:[VLCDialogList class]]);
    VLCDialogList *list = sender;

    struct extension_widget_value_t *value;
    unsigned i = 0;
    NSIndexSet *selectedIndexes = [list selectedRowIndexes];
    for (value = [list widget]->p_values; value != NULL; value = value->p_next, i++)
        value->b_selected = (YES == [selectedIndexes containsIndex:i]);
}

- (void)popUpSelectionChanged:(id)sender
{
    assert([sender isKindOfClass:[VLCDialogPopUpButton class]]);
    VLCDialogPopUpButton *popup = sender;
    struct extension_widget_value_t *value;
    unsigned i = 0;
    for (value = [popup widget]->p_values; value != NULL; value = value->p_next, i++)
        value->b_selected = (i == [popup indexOfSelectedItem]);

}

- (NSSize)windowWillResize:(NSWindow *)sender toSize:(NSSize)frameSize
{
    NSView *contentView = [sender contentView];
    assert([contentView isKindOfClass:[VLCDialogGridView class]]);
    VLCDialogGridView *gridView = (VLCDialogGridView *)contentView;

    NSRect rect = NSMakeRect(0, 0, 0, 0);
    rect.size = frameSize;
    rect = [sender contentRectForFrameRect:rect];
    rect.size = [gridView flexSize:rect.size];
    rect = [sender frameRectForContentRect:rect];
    return rect.size;
}

- (BOOL)windowShouldClose:(id)sender
{
    assert([sender isKindOfClass:[VLCDialogWindow class]]);
    VLCDialogWindow *window = sender;
    extension_dialog_t *dialog = [window dialog];
    extension_DialogClosed(dialog);
    dialog->p_sys_intf = NULL;
    return YES;
}

- (void)updateWidgets:(extension_dialog_t *)dialog
{
    extension_widget_t *widget;
    VLCDialogWindow *dialogWindow = dialog->p_sys_intf;

    FOREACH_ARRAY(widget, dialog->widgets) {
        if (!widget)
            continue; /* Some widgets may be NULL@this point */

        BOOL shouldDestroy = widget->b_kill;
        NSView *control = widget->p_sys_intf;
        BOOL update = widget->b_update;

        if (!control && !shouldDestroy) {
            control = createControlFromWidget(widget, self);
            updateControlFromWidget(control, widget, self);
            widget->p_sys_intf = control;
            update = YES; // Force update and repositionning
            [control setHidden:widget->b_hide];
        }

        if (update && !shouldDestroy) {
            updateControlFromWidget(control, widget, self);
            [control setHidden:widget->b_hide];

            int row = widget->i_row - 1;
            int col = widget->i_column - 1;
            int hsp = __MAX(1, widget->i_horiz_span);
            int vsp = __MAX(1, widget->i_vert_span);
            if (row < 0) {
                row = 4;
                col = 0;
            }

            VLCDialogGridView *gridView = (VLCDialogGridView *)[dialogWindow contentView];
            [gridView updateSubview:control atRow:row column:col rowSpan:vsp colSpan:hsp];

            widget->b_update = false;
        }

        if (shouldDestroy) {
            VLCDialogGridView *gridView = (VLCDialogGridView *)[dialogWindow contentView];
            [gridView removeSubview:control];
            [control release];
            widget->p_sys_intf = NULL;
        }
    }
    FOREACH_END()
}

/** Create a dialog
 * Note: Lock on p_dialog->lock must be held. */
- (VLCDialogWindow *)createExtensionDialog:(extension_dialog_t *)p_dialog
{
    VLCDialogWindow *dialogWindow = nil;

    BOOL shouldDestroy = p_dialog->b_kill;
    if (!shouldDestroy) {
        NSRect content = NSMakeRect(0, 0, 1, 1);
        dialogWindow = [[VLCDialogWindow alloc] initWithContentRect:content
                                                          styleMask:NSTitledWindowMask | NSClosableWindowMask | NSResizableWindowMask
                                                            backing:NSBackingStoreBuffered
                                                              defer:NO];
        [dialogWindow setDelegate:self];
        [dialogWindow setDialog:p_dialog];
        [dialogWindow setTitle:[NSString stringWithUTF8String:p_dialog->psz_title]];

        VLCDialogGridView *gridView = [[VLCDialogGridView alloc] init];
        [gridView setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable];
        [dialogWindow setContentView:gridView];
        [gridView release];

        p_dialog->p_sys_intf = (void *)dialogWindow;
    }

    [self updateWidgets:p_dialog];

    if (shouldDestroy) {
        [dialogWindow setDelegate:nil];
        [dialogWindow close];
        p_dialog->p_sys_intf = NULL;
        dialogWindow = nil;
    }

    return dialogWindow;
}

/** Destroy a dialog
 * Note: Lock on p_dialog->lock must be held. */
- (int)destroyExtensionDialog:(extension_dialog_t *)p_dialog
{
    assert(p_dialog);

    VLCDialogWindow *dialogWindow = (VLCDialogWindow*) p_dialog->p_sys_intf;
    if (!dialogWindow) {
        msg_Warn(VLCIntf, "dialog window not found");
        return VLC_EGENERIC;
    }

    [dialogWindow setDelegate:nil];
    [dialogWindow close];
    dialogWindow = nil;

    p_dialog->p_sys_intf = NULL;
    vlc_cond_signal(&p_dialog->cond);
    return VLC_SUCCESS;
}

/**
 * Update/Create/Destroy a dialog
 **/
- (VLCDialogWindow *)updateExtensionDialog:(NSValue *)o_value
{
    extension_dialog_t *p_dialog = [o_value pointerValue];

    VLCDialogWindow *dialogWindow = (VLCDialogWindow*) p_dialog->p_sys_intf;
    if (p_dialog->b_kill && !dialogWindow) {
        /* This extension could not be activated properly but tried
           to create a dialog. We must ignore it. */
        return NULL;
    }

    vlc_mutex_lock(&p_dialog->lock);
    if (!p_dialog->b_kill && !dialogWindow) {
        dialogWindow = [self createExtensionDialog:p_dialog];

        BOOL visible = !p_dialog->b_hide;
        if (visible) {
            [dialogWindow center];
            [dialogWindow makeKeyAndOrderFront:self];
        } else
            [dialogWindow orderOut:nil];

        [dialogWindow setHas_lock:NO];
    }
    else if (!p_dialog->b_kill && dialogWindow) {
        [dialogWindow setHas_lock:YES];
        [self updateWidgets:p_dialog];
        if (strcmp([[dialogWindow title] UTF8String],
                    p_dialog->psz_title) != 0) {
            NSString *titleString = [NSString stringWithCString:p_dialog->psz_title
                                                       encoding:NSUTF8StringEncoding];

            [dialogWindow setTitle:titleString];
        }

        [dialogWindow setHas_lock:NO];

        BOOL visible = !p_dialog->b_hide;
        if (visible)
            [dialogWindow makeKeyAndOrderFront:self];
        else
            [dialogWindow orderOut:nil];
    }
    else if (p_dialog->b_kill) {
        [self destroyExtensionDialog:p_dialog];
    }
    vlc_cond_signal(&p_dialog->cond);
    vlc_mutex_unlock(&p_dialog->lock);
    return dialogWindow;
}

/**
 * Ask the dialog manager to create/update/kill the dialog. Thread-safe.
 **/
- (void)manageDialog:(extension_dialog_t *)p_dialog
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    assert(p_dialog);
    ExtensionsManager *extMgr = [ExtensionsManager getInstance:p_intf];
    assert(extMgr != NULL);

    NSValue *o_value = [NSValue valueWithPointer:p_dialog];
    [self performSelectorOnMainThread:@selector(updateExtensionDialog:)
                           withObject:o_value
                        waitUntilDone:YES];
    [pool release];
}

@end