/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#include "SDL_assert.h"

#if SDL_VIDEO_DRIVER_COCOA

#include "SDL_cocoavideo.h"

/* We need this for IODisplayCreateInfoDictionary and kIODisplayOnlyPreferredName */
#include <IOKit/graphics/IOGraphicsLib.h>

/* We need this for CVDisplayLinkGetNominalOutputVideoRefreshPeriod */
#include <CoreVideo/CVBase.h>
#include <CoreVideo/CVDisplayLink.h>

/* we need this for ShowMenuBar() and HideMenuBar(). */
#include <Carbon/Carbon.h>

/* This gets us MAC_OS_X_VERSION_MIN_REQUIRED... */
#include <AvailabilityMacros.h>


static void
Cocoa_ToggleMenuBar(const BOOL show)
{
    /* !!! FIXME: keep an eye on this.
     * ShowMenuBar/HideMenuBar is officially unavailable for 64-bit binaries.
     *  It happens to work, as of 10.7, but we're going to see if
     *  we can just simply do without it on newer OSes...
     */
#if (MAC_OS_X_VERSION_MIN_REQUIRED < 1070) && !defined(__LP64__)
    if (show) {
        ShowMenuBar();
    } else {
        HideMenuBar();
    }
#endif
}

static int
CG_SetError(const char *prefix, CGDisplayErr result)
{
    const char *error;

    switch (result) {
    case kCGErrorFailure:
        error = "kCGErrorFailure";
        break;
    case kCGErrorIllegalArgument:
        error = "kCGErrorIllegalArgument";
        break;
    case kCGErrorInvalidConnection:
        error = "kCGErrorInvalidConnection";
        break;
    case kCGErrorInvalidContext:
        error = "kCGErrorInvalidContext";
        break;
    case kCGErrorCannotComplete:
        error = "kCGErrorCannotComplete";
        break;
    case kCGErrorNotImplemented:
        error = "kCGErrorNotImplemented";
        break;
    case kCGErrorRangeCheck:
        error = "kCGErrorRangeCheck";
        break;
    case kCGErrorTypeCheck:
        error = "kCGErrorTypeCheck";
        break;
    case kCGErrorInvalidOperation:
        error = "kCGErrorInvalidOperation";
        break;
    case kCGErrorNoneAvailable:
        error = "kCGErrorNoneAvailable";
        break;
    default:
        error = "Unknown Error";
        break;
    }
    return SDL_SetError("%s: %s", prefix, error);
}

static SDL_bool
GetDisplayMode(_THIS, CGDisplayModeRef vidmode, CVDisplayLinkRef link, SDL_DisplayMode *mode)
{
    SDL_DisplayModeData *data;
    int width = 0;
    int height = 0;
    int bpp = 0;
    int refreshRate = 0;
    CFStringRef fmt;

    data = (SDL_DisplayModeData *) SDL_malloc(sizeof(*data));
    if (!data) {
        return SDL_FALSE;
    }
    data->moderef = vidmode;

    fmt = CGDisplayModeCopyPixelEncoding(vidmode);
    width = (int) CGDisplayModeGetWidth(vidmode);
    height = (int) CGDisplayModeGetHeight(vidmode);
    refreshRate = (int) (CGDisplayModeGetRefreshRate(vidmode) + 0.5);

    if (CFStringCompare(fmt, CFSTR(IO32BitDirectPixels),
                        kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
        bpp = 32;
    } else if (CFStringCompare(fmt, CFSTR(IO16BitDirectPixels),
                        kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
        bpp = 16;
    } else if (CFStringCompare(fmt, CFSTR(kIO30BitDirectPixels),
                        kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
        bpp = 30;
    } else {
        bpp = 0;  /* ignore 8-bit and such for now. */
    }

    CFRelease(fmt);

    /* CGDisplayModeGetRefreshRate returns 0 for many non-CRT displays. */
    if (refreshRate == 0 && link != NULL) {
        CVTime time = CVDisplayLinkGetNominalOutputVideoRefreshPeriod(link);
        if ((time.flags & kCVTimeIsIndefinite) == 0 && time.timeValue != 0) {
            refreshRate = (int) ((time.timeScale / (double) time.timeValue) + 0.5);
        }
    }

    mode->format = SDL_PIXELFORMAT_UNKNOWN;
    switch (bpp) {
    case 16:
        mode->format = SDL_PIXELFORMAT_ARGB1555;
        break;
    case 30:
        mode->format = SDL_PIXELFORMAT_ARGB2101010;
        break;
    case 32:
        mode->format = SDL_PIXELFORMAT_ARGB8888;
        break;
    case 8: /* We don't support palettized modes now */
    default: /* Totally unrecognizable bit depth. */
        SDL_free(data);
        return SDL_FALSE;
    }
    mode->w = width;
    mode->h = height;
    mode->refresh_rate = refreshRate;
    mode->driverdata = data;
    return SDL_TRUE;
}

static const char *
Cocoa_GetDisplayName(CGDirectDisplayID displayID)
{
    CFDictionaryRef deviceInfo = IODisplayCreateInfoDictionary(CGDisplayIOServicePort(displayID), kIODisplayOnlyPreferredName);
    NSDictionary *localizedNames = [(NSDictionary *)deviceInfo objectForKey:[NSString stringWithUTF8String:kDisplayProductName]];
    const char* displayName = NULL;

    if ([localizedNames count] > 0) {
        displayName = SDL_strdup([[localizedNames objectForKey:[[localizedNames allKeys] objectAtIndex:0]] UTF8String]);
    }
    CFRelease(deviceInfo);
    return displayName;
}

void
Cocoa_InitModes(_THIS)
{ @autoreleasepool
{
    CGDisplayErr result;
    CGDirectDisplayID *displays;
    CGDisplayCount numDisplays;
    SDL_bool isstack;
    int pass, i;

    result = CGGetOnlineDisplayList(0, NULL, &numDisplays);
    if (result != kCGErrorSuccess) {
        CG_SetError("CGGetOnlineDisplayList()", result);
        return;
    }
    displays = SDL_small_alloc(CGDirectDisplayID, numDisplays, &isstack);
    result = CGGetOnlineDisplayList(numDisplays, displays, &numDisplays);
    if (result != kCGErrorSuccess) {
        CG_SetError("CGGetOnlineDisplayList()", result);
        SDL_small_free(displays, isstack);
        return;
    }

    /* Pick up the primary display in the first pass, then get the rest */
    for (pass = 0; pass < 2; ++pass) {
        for (i = 0; i < numDisplays; ++i) {
            SDL_VideoDisplay display;
            SDL_DisplayData *displaydata;
            SDL_DisplayMode mode;
            CGDisplayModeRef moderef = NULL;
            CVDisplayLinkRef link = NULL;

            if (pass == 0) {
                if (!CGDisplayIsMain(displays[i])) {
                    continue;
                }
            } else {
                if (CGDisplayIsMain(displays[i])) {
                    continue;
                }
            }

            if (CGDisplayMirrorsDisplay(displays[i]) != kCGNullDirectDisplay) {
                continue;
            }

            moderef = CGDisplayCopyDisplayMode(displays[i]);

            if (!moderef) {
                continue;
            }

            displaydata = (SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
            if (!displaydata) {
                CGDisplayModeRelease(moderef);
                continue;
            }
            displaydata->display = displays[i];

            CVDisplayLinkCreateWithCGDisplay(displays[i], &link);

            SDL_zero(display);
            /* this returns a stddup'ed string */
            display.name = (char *)Cocoa_GetDisplayName(displays[i]);
            if (!GetDisplayMode(_this, moderef, link, &mode)) {
                CVDisplayLinkRelease(link);
                CGDisplayModeRelease(moderef);
                SDL_free(display.name);
                SDL_free(displaydata);
                continue;
            }

            CVDisplayLinkRelease(link);

            display.desktop_mode = mode;
            display.current_mode = mode;
            display.driverdata = displaydata;
            SDL_AddVideoDisplay(&display);
            SDL_free(display.name);
        }
    }
    SDL_small_free(displays, isstack);
}}

int
Cocoa_GetDisplayBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
{
    SDL_DisplayData *displaydata = (SDL_DisplayData *) display->driverdata;
    CGRect cgrect;

    cgrect = CGDisplayBounds(displaydata->display);
    rect->x = (int)cgrect.origin.x;
    rect->y = (int)cgrect.origin.y;
    rect->w = (int)cgrect.size.width;
    rect->h = (int)cgrect.size.height;
    return 0;
}

int
Cocoa_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
{
    SDL_DisplayData *displaydata = (SDL_DisplayData *) display->driverdata;
    const CGDirectDisplayID cgdisplay = displaydata->display;
    NSArray *screens = [NSScreen screens];
    NSScreen *screen = nil;

    /* !!! FIXME: maybe track the NSScreen in SDL_DisplayData? */
    for (NSScreen *i in screens) {
        const CGDirectDisplayID thisDisplay = (CGDirectDisplayID) [[[i deviceDescription] objectForKey:@"NSScreenNumber"] unsignedIntValue];
        if (thisDisplay == cgdisplay) {
            screen = i;
            break;
        }
    }

    SDL_assert(screen != nil);  /* didn't find it?! */
    if (screen == nil) {
        return -1;
    }

    const CGRect cgrect = CGDisplayBounds(cgdisplay);
    const NSRect frame = [screen visibleFrame];

    // !!! FIXME: I assume -[NSScreen visibleFrame] is relative to the origin of the screen in question and not the whole desktop.
    // !!! FIXME: The math vs CGDisplayBounds might be incorrect if that's not the case, though. Check this.
    rect->x = (int)(cgrect.origin.x + frame.origin.x);
    rect->y = (int)(cgrect.origin.y + frame.origin.y);
    rect->w = (int)frame.size.width;
    rect->h = (int)frame.size.height;

    return 0;
}

int
Cocoa_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi)
{
    const float MM_IN_INCH = 25.4f;

    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;

    CGSize displaySize = CGDisplayScreenSize(data->display);
    int pixelWidth =  (int) CGDisplayPixelsWide(data->display);
    int pixelHeight = (int) CGDisplayPixelsHigh(data->display);

    if (ddpi) {
        *ddpi = SDL_ComputeDiagonalDPI(pixelWidth, pixelHeight, displaySize.width / MM_IN_INCH, displaySize.height / MM_IN_INCH);
    }
    if (hdpi) {
        *hdpi = pixelWidth * MM_IN_INCH / displaySize.width;
    }
    if (vdpi) {
        *vdpi = pixelHeight * MM_IN_INCH / displaySize.height;
    }

    return 0;
}

void
Cocoa_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
{
    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
    CVDisplayLinkRef link = NULL;
    CGDisplayModeRef desktopmoderef;
    SDL_DisplayMode desktopmode;
    CFArrayRef modes;

    CVDisplayLinkCreateWithCGDisplay(data->display, &link);

    desktopmoderef = CGDisplayCopyDisplayMode(data->display);

    /* CopyAllDisplayModes won't always contain the desktop display mode (if
     * NULL is passed in) - for example on a retina 15" MBP, System Preferences
     * allows choosing 1920x1200 but it's not in the list. AddDisplayMode makes
     * sure there are no duplicates so it's safe to always add the desktop mode
     * even in cases where it is in the CopyAllDisplayModes list.
     */
    if (desktopmoderef && GetDisplayMode(_this, desktopmoderef, link, &desktopmode)) {
        if (!SDL_AddDisplayMode(display, &desktopmode)) {
            CGDisplayModeRelease(desktopmoderef);
            SDL_free(desktopmode.driverdata);
        }
    } else {
        CGDisplayModeRelease(desktopmoderef);
    }

    modes = CGDisplayCopyAllDisplayModes(data->display, NULL);

    if (modes) {
        CFIndex i;
        const CFIndex count = CFArrayGetCount(modes);

        for (i = 0; i < count; i++) {
            CGDisplayModeRef moderef = (CGDisplayModeRef) CFArrayGetValueAtIndex(modes, i);
            SDL_DisplayMode mode;

            if (GetDisplayMode(_this, moderef, link, &mode)) {
                if (SDL_AddDisplayMode(display, &mode)) {
                    CGDisplayModeRetain(moderef);
                } else {
                    SDL_free(mode.driverdata);
                }
            }
        }

        CFRelease(modes);
    }

    CVDisplayLinkRelease(link);
}

int
Cocoa_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
{
    SDL_DisplayData *displaydata = (SDL_DisplayData *) display->driverdata;
    SDL_DisplayModeData *data = (SDL_DisplayModeData *) mode->driverdata;
    CGDisplayFadeReservationToken fade_token = kCGDisplayFadeReservationInvalidToken;
    CGError result;

    /* Fade to black to hide resolution-switching flicker */
    if (CGAcquireDisplayFadeReservation(5, &fade_token) == kCGErrorSuccess) {
        CGDisplayFade(fade_token, 0.3, kCGDisplayBlendNormal, kCGDisplayBlendSolidColor, 0.0, 0.0, 0.0, TRUE);
    }

    if (data == display->desktop_mode.driverdata) {
        /* Restoring desktop mode */
        CGDisplaySetDisplayMode(displaydata->display, data->moderef, NULL);

        if (CGDisplayIsMain(displaydata->display)) {
            CGReleaseAllDisplays();
        } else {
            CGDisplayRelease(displaydata->display);
        }

        if (CGDisplayIsMain(displaydata->display)) {
            Cocoa_ToggleMenuBar(YES);
        }
    } else {
        /* Put up the blanking window (a window above all other windows) */
        if (CGDisplayIsMain(displaydata->display)) {
            /* If we don't capture all displays, Cocoa tries to rearrange windows... *sigh* */
            result = CGCaptureAllDisplays();
        } else {
            result = CGDisplayCapture(displaydata->display);
        }
        if (result != kCGErrorSuccess) {
            CG_SetError("CGDisplayCapture()", result);
            goto ERR_NO_CAPTURE;
        }

        /* Do the physical switch */
        result = CGDisplaySetDisplayMode(displaydata->display, data->moderef, NULL);
        if (result != kCGErrorSuccess) {
            CG_SetError("CGDisplaySwitchToMode()", result);
            goto ERR_NO_SWITCH;
        }

        /* Hide the menu bar so it doesn't intercept events */
        if (CGDisplayIsMain(displaydata->display)) {
            Cocoa_ToggleMenuBar(NO);
        }
    }

    /* Fade in again (asynchronously) */
    if (fade_token != kCGDisplayFadeReservationInvalidToken) {
        CGDisplayFade(fade_token, 0.5, kCGDisplayBlendSolidColor, kCGDisplayBlendNormal, 0.0, 0.0, 0.0, FALSE);
        CGReleaseDisplayFadeReservation(fade_token);
    }

    return 0;

    /* Since the blanking window covers *all* windows (even force quit) correct recovery is crucial */
ERR_NO_SWITCH:
    CGDisplayRelease(displaydata->display);
ERR_NO_CAPTURE:
    if (fade_token != kCGDisplayFadeReservationInvalidToken) {
        CGDisplayFade (fade_token, 0.5, kCGDisplayBlendSolidColor, kCGDisplayBlendNormal, 0.0, 0.0, 0.0, FALSE);
        CGReleaseDisplayFadeReservation(fade_token);
    }
    return -1;
}

void
Cocoa_QuitModes(_THIS)
{
    int i, j;

    for (i = 0; i < _this->num_displays; ++i) {
        SDL_VideoDisplay *display = &_this->displays[i];
        SDL_DisplayModeData *mode;

        if (display->current_mode.driverdata != display->desktop_mode.driverdata) {
            Cocoa_SetDisplayMode(_this, display, &display->desktop_mode);
        }

        mode = (SDL_DisplayModeData *) display->desktop_mode.driverdata;
        CGDisplayModeRelease(mode->moderef);

        for (j = 0; j < display->num_display_modes; j++) {
            mode = (SDL_DisplayModeData*) display->display_modes[j].driverdata;
            CGDisplayModeRelease(mode->moderef);
        }

    }
    Cocoa_ToggleMenuBar(YES);
}

#endif /* SDL_VIDEO_DRIVER_COCOA */

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