/*
 * Copyright (C) 2010 The Android Open Source Project
 * Copyright (C) 2012, The Linux Foundation. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <fcntl.h>
#include <errno.h>

#include <cutils/log.h>
#include <cutils/atomic.h>
#include <EGL/egl.h>

#include <overlay.h>
#include <fb_priv.h>
#include <mdp_version.h>
#include "hwc_utils.h"
#include "hwc_qbuf.h"
#include "hwc_video.h"
#include "hwc_uimirror.h"
#include "hwc_copybit.h"
#include "external.h"
#include "hwc_mdpcomp.h"
#include "hwc_extonly.h"

using namespace qhwc;

static int hwc_device_open(const struct hw_module_t* module,
                           const char* name,
                           struct hw_device_t** device);

static struct hw_module_methods_t hwc_module_methods = {
    open: hwc_device_open
};

hwc_module_t HAL_MODULE_INFO_SYM = {
    common: {
        tag: HARDWARE_MODULE_TAG,
        version_major: 2,
        version_minor: 0,
        id: HWC_HARDWARE_MODULE_ID,
        name: "Qualcomm Hardware Composer Module",
        author: "CodeAurora Forum",
        methods: &hwc_module_methods,
        dso: 0,
        reserved: {0},
    }
};

/*
 * Save callback functions registered to HWC
 */
static void hwc_registerProcs(struct hwc_composer_device_1* dev,
                              hwc_procs_t const* procs)
{
    hwc_context_t* ctx = (hwc_context_t*)(dev);
    if(!ctx) {
        ALOGE("%s: Invalid context", __FUNCTION__);
        return;
    }
    ctx->proc = procs;

    // don't start listening for events until we can do something with them
    init_uevent_thread(ctx);
}

//Helper
static void reset() {
    //reset for this draw round
    VideoOverlay::reset();
    ExtOnly::reset();
    UIMirrorOverlay::reset();
    ExtOnly::reset();
    //TODO MDPComp
}

static int hwc_prepare(hwc_composer_device_1 *dev, size_t numDisplays,
                       hwc_display_contents_1_t** displays)
{
    hwc_context_t* ctx = (hwc_context_t*)(dev);
    ctx->overlayInUse = false;

    reset();

    //If securing of h/w in progress skip comp using overlay.
    if(ctx->mSecuring == true) return 0;

    for (uint32_t i = 0; i < numDisplays; i++) {
        hwc_display_contents_1_t *list = displays[i];
        //XXX: Actually handle the multiple displays
        if (LIKELY(list && list->numHwLayers)) {
            ctx->dpys[i] = list->dpy;

            if(ctx->isPoweredDown)
                ALOGW("SF called %s after a POWERDOWN", __FUNCTION__);

            getLayerStats(ctx, list);
            if(VideoOverlay::prepare(ctx, list)) {
                ctx->overlayInUse = true;
                //Nothing here
            } else if(ExtOnly::prepare(ctx, list)) {
                ctx->overlayInUse = true;
            } else if(UIMirrorOverlay::prepare(ctx, list)) {
                ctx->overlayInUse = true;
            } else if(MDPComp::configure(dev, list)) {
                ctx->overlayInUse = true;
            } else if (0) {
                //Other features
                ctx->overlayInUse = true;
            } else { // Else set this flag to false, otherwise video cases
                // fail in non-overlay targets.
                ctx->overlayInUse = false;
            }
        }
    }

    return 0;
}

static int hwc_eventControl(struct hwc_composer_device_1* dev, int dpy,
                             int event, int enabled)
{
    int ret = 0;
    hwc_context_t* ctx = (hwc_context_t*)(dev);
    private_module_t* m = reinterpret_cast<private_module_t*>(
                ctx->mFbDev->common.module);
    //XXX: Handle dpy
    switch(event) {
        case HWC_EVENT_VSYNC:
            if(ioctl(m->framebuffer->fd, MSMFB_OVERLAY_VSYNC_CTRL, &enabled) < 0)
                ret = -errno;

            if(ctx->mExtDisplay->getExternalDisplay()) {
                ret = ctx->mExtDisplay->enableHDMIVsync(enabled);
            }
           break;
        default:
            ret = -EINVAL;
    }
    return ret;
}

static int hwc_blank(struct hwc_composer_device_1* dev, int dpy, int blank)
{
    //XXX: Handle based on dpy
    hwc_context_t* ctx = (hwc_context_t*)(dev);
    private_module_t* m = reinterpret_cast<private_module_t*>(
        ctx->mFbDev->common.module);
    if(blank) {
        ctx->mOverlay->setState(ovutils::OV_CLOSED);
        ctx->qbuf->unlockAllPrevious();
        ALOGD("HWC Calling POWERDOWN ...");
        ioctl(m->framebuffer->fd, FBIOBLANK, FB_BLANK_POWERDOWN);
        ALOGD("HWC Done POWERDOWN ...");
        ctx->isPoweredDown = true;
    } else {
        ALOGD("HWC Calling UNBLANK ...");
        ioctl(m->framebuffer->fd, FBIOBLANK, FB_BLANK_UNBLANK);
        ALOGD("HWC Done UNBLANK ...");
        ctx->isPoweredDown = false;
    }
    return 0;
}

static int hwc_query(struct hwc_composer_device_1* dev,
                     int param, int* value)
{
    hwc_context_t* ctx = (hwc_context_t*)(dev);
    private_module_t* m = reinterpret_cast<private_module_t*>(
        ctx->mFbDev->common.module);

    switch (param) {
    case HWC_BACKGROUND_LAYER_SUPPORTED:
        // Not supported for now
        value[0] = 0;
        break;
    case HWC_VSYNC_PERIOD:
        value[0] = m->fps;
        ALOGI("fps: %d", value[0]);
        break;
    default:
        return -EINVAL;
    }
    return 0;

}

static int hwc_set(hwc_composer_device_1 *dev,
                   size_t numDisplays,
                   hwc_display_contents_1_t** displays)
{
    int ret = 0;
    hwc_context_t* ctx = (hwc_context_t*)(dev);
    for (uint32_t i = 0; i <numDisplays; i++) {
        hwc_display_contents_1_t* list = displays[i];
        //XXX: Actually handle the multiple displays
        if (LIKELY(list)) {
            VideoOverlay::draw(ctx, list);
            ExtOnly::draw(ctx, list);
            MDPComp::draw(ctx, list);

            //Sync TODO better error handling.
            hwc_sync(list);

            EGLBoolean success = eglSwapBuffers((EGLDisplay)list->dpy,
                                                (EGLSurface)list->sur);
            wait4fbPost(ctx);
            //Can draw to HDMI only when fb_post is reached
            UIMirrorOverlay::draw(ctx);
            //HDMI commit and primary commit (PAN) happening in parallel
            if(ctx->mExtDisplay->getExternalDisplay())
                ctx->mExtDisplay->commit();
            //Virtual barrier for threads to finish
            wait4Pan(ctx);
        } else {
            ctx->mOverlay->setState(ovutils::OV_CLOSED);
            ctx->qbuf->unlockAll();
        }

        if(!ctx->overlayInUse)
            ctx->mOverlay->setState(ovutils::OV_CLOSED);
    }
    ctx->qbuf->unlockAllPrevious();
    return ret;
}

static int hwc_device_close(struct hw_device_t *dev)
{
    if(!dev) {
        ALOGE("%s: NULL device pointer", __FUNCTION__);
        return -1;
    }
    closeContext((hwc_context_t*)dev);
    free(dev);

    return 0;
}

static int hwc_device_open(const struct hw_module_t* module, const char* name,
                           struct hw_device_t** device)
{
    int status = -EINVAL;

    if (!strcmp(name, HWC_HARDWARE_COMPOSER)) {
        struct hwc_context_t *dev;
        dev = (hwc_context_t*)malloc(sizeof(*dev));
        memset(dev, 0, sizeof(*dev));

        //Initialize hwc context
        initContext(dev);

        //Setup HWC methods
        dev->device.common.tag     = HARDWARE_DEVICE_TAG;
        dev->device.common.version = HWC_DEVICE_API_VERSION_1_0;
        dev->device.common.module  = const_cast<hw_module_t*>(module);
        dev->device.common.close   = hwc_device_close;
        dev->device.prepare        = hwc_prepare;
        dev->device.set            = hwc_set;
        dev->device.eventControl   = hwc_eventControl;
        dev->device.blank          = hwc_blank;
        dev->device.query          = hwc_query;
        dev->device.registerProcs  = hwc_registerProcs;
        *device                    = &dev->device.common;
        status = 0;
    }
    return status;
}