/*
 * Cocoa Application Event Handling
 *
 * This file is part of mpv.
 *
 * mpv 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.
 *
 * mpv 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 mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

// Carbon header is included but Carbon is NOT linked to mpv's binary. This
// file only needs this include to use the keycode definitions in keymap.
#import <Carbon/Carbon.h>

// Media keys definitions
#import <IOKit/hidsystem/ev_keymap.h>
#import <Cocoa/Cocoa.h>

#include "talloc.h"
#include "core/input/input.h"
#include "core/mp_fifo.h"
// doesn't make much sense, but needed to access keymap functionality
#include "video/out/vo.h"

#import  "osdep/macosx_application_objc.h"
#include "osdep/macosx_events.h"
#include "osdep/macosx_compat.h"

#define NSLeftAlternateKeyMask  (0x000020 | NSAlternateKeyMask)
#define NSRightAlternateKeyMask (0x000040 | NSAlternateKeyMask)

static bool LeftAltPressed(NSEvent *event)
{
    return ([event modifierFlags] & NSLeftAlternateKeyMask) ==
            NSLeftAlternateKeyMask;
}

static bool RightAltPressed(NSEvent *event)
{
    return ([event modifierFlags] & NSRightAlternateKeyMask) ==
            NSRightAlternateKeyMask;
}

static const struct mp_keymap keymap[] = {
    // special keys
    {kVK_Return, MP_KEY_ENTER}, {kVK_Escape, MP_KEY_ESC},
    {kVK_Delete, MP_KEY_BACKSPACE}, {kVK_Option, MP_KEY_BACKSPACE},
    {kVK_Control, MP_KEY_BACKSPACE}, {kVK_Shift, MP_KEY_BACKSPACE},
    {kVK_Tab, MP_KEY_TAB},

    // cursor keys
    {kVK_UpArrow, MP_KEY_UP}, {kVK_DownArrow, MP_KEY_DOWN},
    {kVK_LeftArrow, MP_KEY_LEFT}, {kVK_RightArrow, MP_KEY_RIGHT},

    // navigation block
    {kVK_Help, MP_KEY_INSERT}, {kVK_ForwardDelete, MP_KEY_DELETE},
    {kVK_Home, MP_KEY_HOME}, {kVK_End, MP_KEY_END},
    {kVK_PageUp, MP_KEY_PAGE_UP}, {kVK_PageDown, MP_KEY_PAGE_DOWN},

    // F-keys
    {kVK_F1, MP_KEY_F + 1}, {kVK_F2, MP_KEY_F + 2}, {kVK_F3, MP_KEY_F + 3},
    {kVK_F4, MP_KEY_F + 4}, {kVK_F5, MP_KEY_F + 5}, {kVK_F6, MP_KEY_F + 6},
    {kVK_F7, MP_KEY_F + 7}, {kVK_F8, MP_KEY_F + 8}, {kVK_F9, MP_KEY_F + 9},
    {kVK_F10, MP_KEY_F + 10}, {kVK_F11, MP_KEY_F + 11}, {kVK_F12, MP_KEY_F + 12},

    // numpad
    {kVK_ANSI_KeypadPlus, '+'}, {kVK_ANSI_KeypadMinus, '-'},
    {kVK_ANSI_KeypadMultiply, '*'}, {kVK_ANSI_KeypadDivide, '/'},
    {kVK_ANSI_KeypadEnter, MP_KEY_KPENTER},
    {kVK_ANSI_KeypadDecimal, MP_KEY_KPDEC},
    {kVK_ANSI_Keypad0, MP_KEY_KP0}, {kVK_ANSI_Keypad1, MP_KEY_KP1},
    {kVK_ANSI_Keypad2, MP_KEY_KP2}, {kVK_ANSI_Keypad3, MP_KEY_KP3},
    {kVK_ANSI_Keypad4, MP_KEY_KP4}, {kVK_ANSI_Keypad5, MP_KEY_KP5},
    {kVK_ANSI_Keypad6, MP_KEY_KP6}, {kVK_ANSI_Keypad7, MP_KEY_KP7},
    {kVK_ANSI_Keypad8, MP_KEY_KP8}, {kVK_ANSI_Keypad9, MP_KEY_KP9},

    {0, 0}
};

static int convert_key(unsigned key, unsigned charcode)
{
    int mpkey = lookup_keymap_table(keymap, key);
    if (mpkey)
        return mpkey;
    return charcode;
}

void cocoa_init_apple_remote(void)
{
    Application *app = mpv_shared_app();
    [app.eventsResponder startAppleRemote];
}

void cocoa_uninit_apple_remote(void)
{
    Application *app = mpv_shared_app();
    [app.eventsResponder stopAppleRemote];
}

static int mk_code(NSEvent *event)
{
    return (([event data1] & 0xFFFF0000) >> 16);
}

static int mk_flags(NSEvent *event)
{
    return ([event data1] & 0x0000FFFF);
}

static  int mk_down(NSEvent *event) {
    return (((mk_flags(event) & 0xFF00) >> 8)) == 0xA;
}

static CGEventRef tap_event_callback(CGEventTapProxy proxy, CGEventType type,
                                     CGEventRef event, void *ctx)
{
    EventsResponder *responder = ctx;

    if (type == kCGEventTapDisabledByTimeout) {
        // The Mach Port receiving the taps became unresponsive for some
        // reason, restart listening on it.
        [responder restartMediaKeys];
        return event;
    }

    if (type == kCGEventTapDisabledByUserInput)
        return event;

    NSEvent *nse = [NSEvent eventWithCGEvent:event];

    if ([nse type] != NSSystemDefined || [nse subtype] != 8)
        // This is not a media key
        return event;

    if (mk_down(nse) && [responder handleMediaKey:nse]) {
        // Handled this event, return nil so that it is removed from the
        // global queue.
        return nil;
    } else {
        // Was a media key but we were not interested in it. Leave it in the
        // global queue by returning the original event.
        return event;
    }
}

void cocoa_init_media_keys(void) {
    Application *app = mpv_shared_app();
    [app.eventsResponder startMediaKeys];
}

void cocoa_uninit_media_keys(void) {
    Application *app = mpv_shared_app();
    [app.eventsResponder stopMediaKeys];
}

void cocoa_check_events(void)
{
    Application *app = mpv_shared_app();
    int key;
    while ((key = [app.iqueue pop]) >= 0)
        mplayer_put_key(app.keyFIFO, key);
}

void cocoa_put_key(int keycode)
{
    [mpv_shared_app().iqueue push:keycode];
}

@implementation EventsResponder {
    CFMachPortRef _mk_tap_port;
    HIDRemote *_remote;
}
- (void)startAppleRemote
{
    dispatch_async(dispatch_get_main_queue(), ^{
        self->_remote = [[HIDRemote alloc] init];
        if (self->_remote) {
            [self->_remote setDelegate:self];
            [self->_remote startRemoteControl:kHIDRemoteModeExclusiveAuto];
        }
    });

}
- (void)stopAppleRemote
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [self->_remote stopRemoteControl];
        [self->_remote release];
    });
}
- (void)restartMediaKeys
{
    CGEventTapEnable(self->_mk_tap_port, true);
}
- (void)startMediaKeys
{
    dispatch_async(dispatch_get_main_queue(), ^{
        // Install a Quartz Event Tap. This will notify mpv through the
        // returned Mach Port and cause mpv to execute the `tap_event_callback`
        // function.
        self->_mk_tap_port = CGEventTapCreate(kCGSessionEventTap,
            kCGHeadInsertEventTap,
            kCGEventTapOptionDefault,
            CGEventMaskBit(NX_SYSDEFINED),
            tap_event_callback,
            self);

        assert(self->_mk_tap_port != nil);

        NSMachPort *port = (NSMachPort *)self->_mk_tap_port;
        [[NSRunLoop mainRunLoop] addPort:port forMode:NSRunLoopCommonModes];
    });
}
- (void)stopMediaKeys
{
    dispatch_async(dispatch_get_main_queue(), ^{
        NSMachPort *port = (NSMachPort *)self->_mk_tap_port;
        [[NSRunLoop mainRunLoop] removePort:port forMode:NSRunLoopCommonModes];
        CFRelease(self->_mk_tap_port);
        self->_mk_tap_port = nil;
    });
}

- (NSArray *) keyEquivalents
{
    return @[@"h", @"q", @"Q", @"0", @"1", @"2"];
}

- (BOOL)isAppKeyEquivalent:(NSString *)eq withEvent:(NSEvent *)event
{
    if ([event modifierFlags] & NSCommandKeyMask)
        for(NSString *c in [self keyEquivalents])
            if ([eq isEqualToString:c])
                return YES;

    return NO;
}

- (BOOL)handleMediaKey:(NSEvent *)event
{
    NSDictionary *keymap = @{
        @(NX_KEYTYPE_PLAY):    @(MP_MK_PLAY),
        @(NX_KEYTYPE_REWIND):  @(MP_MK_PREV),
        @(NX_KEYTYPE_FAST):    @(MP_MK_NEXT),
    };

    return [self handleKey:mk_code(event)
                  withMask:[self keyModifierMask:event]
                andMapping:keymap];
}

- (NSEvent*)handleKeyDown:(NSEvent *)event
{
    NSString *chars;

    if (RightAltPressed(event))
        chars = [event characters];
    else
        chars = [event charactersIgnoringModifiers];

    int key = convert_key([event keyCode], *[chars UTF8String]);

    if (key > -1) {
        if ([self isAppKeyEquivalent:chars withEvent:event])
            // propagate the event in case this is a menu key equivalent
            return event;

        key |= [self keyModifierMask:event];
        cocoa_put_key(key);
    }

    return nil;
}

- (void)hidRemote:(HIDRemote *)remote
    eventWithButton:(HIDRemoteButtonCode)buttonCode
          isPressed:(BOOL)isPressed
 fromHardwareWithAttributes:(NSMutableDictionary *)attributes
{
    if (!isPressed) return;

    NSDictionary *keymap = @{
        @(kHIDRemoteButtonCodePlay):       @(MP_AR_PLAY),
        @(kHIDRemoteButtonCodePlayHold):   @(MP_AR_PLAY_HOLD),
        @(kHIDRemoteButtonCodeCenter):     @(MP_AR_CENTER),
        @(kHIDRemoteButtonCodeCenterHold): @(MP_AR_CENTER_HOLD),
        @(kHIDRemoteButtonCodeLeft):       @(MP_AR_PREV),
        @(kHIDRemoteButtonCodeLeftHold):   @(MP_AR_PREV_HOLD),
        @(kHIDRemoteButtonCodeRight):      @(MP_AR_NEXT),
        @(kHIDRemoteButtonCodeRightHold):  @(MP_AR_NEXT_HOLD),
        @(kHIDRemoteButtonCodeMenu):       @(MP_AR_MENU),
        @(kHIDRemoteButtonCodeMenuHold):   @(MP_AR_MENU_HOLD),
        @(kHIDRemoteButtonCodeUp):         @(MP_AR_VUP),
        @(kHIDRemoteButtonCodeUpHold):     @(MP_AR_VUP_HOLD),
        @(kHIDRemoteButtonCodeDown):       @(MP_AR_VDOWN),
        @(kHIDRemoteButtonCodeDownHold):   @(MP_AR_VDOWN_HOLD),
    };

    [self handleKey:buttonCode withMask:0 andMapping:keymap];
}

- (int)keyModifierMask:(NSEvent *)event
{
    int mask = 0;
    if ([event modifierFlags] & NSShiftKeyMask)
        mask |= MP_KEY_MODIFIER_SHIFT;
    if ([event modifierFlags] & NSControlKeyMask)
        mask |= MP_KEY_MODIFIER_CTRL;
    if (LeftAltPressed(event))
        mask |= MP_KEY_MODIFIER_ALT;
    if ([event modifierFlags] & NSCommandKeyMask)
        mask |= MP_KEY_MODIFIER_META;

    return mask;
}

-(BOOL)handleKey:(int)key withMask:(int)mask andMapping:(NSDictionary *)mapping
{
    int mpkey = [mapping[@(key)] intValue];
    if (mpkey > 0) {
        cocoa_put_key(mpkey | mask);
        return YES;
    } else {
        return NO;
    }
}
@end