/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 *
 * Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * 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 <freerdp/config.h>

#include <winpr/assert.h>

#include "shadow.h"

#include "shadow_encoder.h"

#include <freerdp/log.h>
#define TAG CLIENT_TAG("shadow")

UINT32 shadow_encoder_preferred_fps(rdpShadowEncoder* encoder)
{
	/* Return preferred fps calculated according to the last
	 * sent frame id and last client-acknowledged frame id.
	 */
	return encoder->fps;
}

UINT32 shadow_encoder_inflight_frames(rdpShadowEncoder* encoder)
{
	/* Return in-flight frame count.
	 * If queueDepth is SUSPEND_FRAME_ACKNOWLEDGEMENT, count = 0
	 * Otherwise, calculate count =
	 * <last sent frame id> - <last client-acknowledged frame id>
	 * Note: This function is exported so that subsystem could
	 * implement its own strategy to tune fps.
	 */
	return (encoder->queueDepth == SUSPEND_FRAME_ACKNOWLEDGEMENT)
	           ? 0
	           : encoder->frameId - encoder->lastAckframeId;
}

UINT32 shadow_encoder_create_frame_id(rdpShadowEncoder* encoder)
{
	UINT32 frameId = 0;
	UINT32 inFlightFrames = shadow_encoder_inflight_frames(encoder);

	/*
	 * Calculate preferred fps according to how much frames are
	 * in-progress. Note that it only works when subsystem implementation
	 * calls shadow_encoder_preferred_fps and takes the suggestion.
	 */
	if (inFlightFrames > 1)
	{
		encoder->fps = (100 / (inFlightFrames + 1) * encoder->maxFps) / 100;
	}
	else
	{
		encoder->fps += 2;

		if (encoder->fps > encoder->maxFps)
			encoder->fps = encoder->maxFps;
	}

	if (encoder->fps < 1)
		encoder->fps = 1;

	frameId = ++encoder->frameId;
	return frameId;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init_grid(rdpShadowEncoder* encoder)
{
	UINT32 tileSize = 0;
	UINT32 tileCount = 0;
	encoder->gridWidth = ((encoder->width + (encoder->maxTileWidth - 1)) / encoder->maxTileWidth);
	encoder->gridHeight =
	    ((encoder->height + (encoder->maxTileHeight - 1)) / encoder->maxTileHeight);
	tileSize = encoder->maxTileWidth * encoder->maxTileHeight * 4;
	tileCount = encoder->gridWidth * encoder->gridHeight;
	encoder->gridBuffer = (BYTE*)calloc(tileSize, tileCount);

	if (!encoder->gridBuffer)
		return -1;

	encoder->grid = (BYTE**)calloc(tileCount, sizeof(BYTE*));

	if (!encoder->grid)
		return -1;

	for (UINT32 i = 0; i < encoder->gridHeight; i++)
	{
		for (UINT32 j = 0; j < encoder->gridWidth; j++)
		{
			const size_t k = (1ULL * i * encoder->gridWidth) + j;
			encoder->grid[k] = &(encoder->gridBuffer[k * tileSize]);
		}
	}

	return 0;
}

static int shadow_encoder_uninit_grid(rdpShadowEncoder* encoder)
{
	if (encoder->gridBuffer)
	{
		free(encoder->gridBuffer);
		encoder->gridBuffer = nullptr;
	}

	if (encoder->grid)
	{
		free((void*)encoder->grid);
		encoder->grid = nullptr;
	}

	encoder->gridWidth = 0;
	encoder->gridHeight = 0;
	return 0;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init_rfx(rdpShadowEncoder* encoder)
{
	if (!encoder->rfx)
		encoder->rfx = rfx_context_new_ex(
		    TRUE, freerdp_settings_get_uint32(encoder->server->settings, FreeRDP_ThreadingFlags));

	if (!encoder->rfx)
		goto fail;

	if (!rfx_context_reset(encoder->rfx, encoder->width, encoder->height))
		goto fail;

	{
		const UINT32 mode =
		    freerdp_settings_get_uint32(encoder->server->settings, FreeRDP_RemoteFxRlgrMode);
		if (!rfx_context_set_mode(encoder->rfx, WINPR_ASSERTING_INT_CAST(RLGR_MODE, mode)))
			goto fail;
	}
	rfx_context_set_pixel_format(encoder->rfx, PIXEL_FORMAT_BGRX32);
	encoder->codecs |= FREERDP_CODEC_REMOTEFX;
	return 1;
fail:
	rfx_context_free(encoder->rfx);
	return -1;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init_nsc(rdpShadowEncoder* encoder)
{
	rdpContext* context = (rdpContext*)encoder->client;
	rdpSettings* settings = context->settings;

	if (!encoder->nsc)
		encoder->nsc = nsc_context_new();

	if (!encoder->nsc)
		goto fail;

	if (!nsc_context_reset(encoder->nsc, encoder->width, encoder->height))
		goto fail;

	if (!nsc_context_set_parameters(
	        encoder->nsc, NSC_COLOR_LOSS_LEVEL,
	        freerdp_settings_get_uint32(settings, FreeRDP_NSCodecColorLossLevel)))
		goto fail;
	if (!nsc_context_set_parameters(
	        encoder->nsc, NSC_ALLOW_SUBSAMPLING,
	        freerdp_settings_get_bool(settings, FreeRDP_NSCodecAllowSubsampling) ? 1 : 0))
		goto fail;
	if (!nsc_context_set_parameters(
	        encoder->nsc, NSC_DYNAMIC_COLOR_FIDELITY,
	        !freerdp_settings_get_bool(settings, FreeRDP_NSCodecAllowDynamicColorFidelity)))
		goto fail;
	if (!nsc_context_set_parameters(encoder->nsc, NSC_COLOR_FORMAT, PIXEL_FORMAT_BGRX32))
		goto fail;
	encoder->codecs |= FREERDP_CODEC_NSCODEC;
	return 1;
fail:
	nsc_context_free(encoder->nsc);
	return -1;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init_planar(rdpShadowEncoder* encoder)
{
	DWORD planarFlags = 0;
	rdpContext* context = (rdpContext*)encoder->client;
	rdpSettings* settings = context->settings;

	if (freerdp_settings_get_bool(settings, FreeRDP_DrawAllowSkipAlpha))
		planarFlags |= PLANAR_FORMAT_HEADER_NA;

	planarFlags |= PLANAR_FORMAT_HEADER_RLE;

	if (!encoder->planar)
	{
		encoder->planar = freerdp_bitmap_planar_context_new(planarFlags, encoder->maxTileWidth,
		                                                    encoder->maxTileHeight);
	}

	if (!encoder->planar)
		goto fail;

	if (!freerdp_bitmap_planar_context_reset(encoder->planar, encoder->maxTileWidth,
	                                         encoder->maxTileHeight))
		goto fail;

	encoder->codecs |= FREERDP_CODEC_PLANAR;
	return 1;
fail:
	freerdp_bitmap_planar_context_free(encoder->planar);
	return -1;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init_interleaved(rdpShadowEncoder* encoder)
{
	if (!encoder->interleaved)
		encoder->interleaved = bitmap_interleaved_context_new(TRUE);

	if (!encoder->interleaved)
		goto fail;

	if (!bitmap_interleaved_context_reset(encoder->interleaved))
		goto fail;

	encoder->codecs |= FREERDP_CODEC_INTERLEAVED;
	return 1;
fail:
	bitmap_interleaved_context_free(encoder->interleaved);
	return -1;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init_h264(rdpShadowEncoder* encoder)
{
	if (!encoder->h264)
		encoder->h264 = h264_context_new(TRUE);

	if (!encoder->h264)
		goto fail;

	if (!h264_context_reset(encoder->h264, encoder->width, encoder->height))
		goto fail;

	if (!h264_context_set_option(encoder->h264, H264_CONTEXT_OPTION_RATECONTROL,
	                             encoder->server->h264RateControlMode))
		goto fail;
	if (!h264_context_set_option(encoder->h264, H264_CONTEXT_OPTION_BITRATE,
	                             encoder->server->h264BitRate))
		goto fail;
	if (!h264_context_set_option(encoder->h264, H264_CONTEXT_OPTION_FRAMERATE,
	                             encoder->server->h264FrameRate))
		goto fail;
	if (!h264_context_set_option(encoder->h264, H264_CONTEXT_OPTION_QP, encoder->server->h264QP))
		goto fail;

	encoder->codecs |= FREERDP_CODEC_AVC420 | FREERDP_CODEC_AVC444;
	return 1;
fail:
	h264_context_free(encoder->h264);
	return -1;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init_progressive(rdpShadowEncoder* encoder)
{
	WINPR_ASSERT(encoder);
	if (!encoder->progressive)
		encoder->progressive = progressive_context_new(TRUE);

	if (!encoder->progressive)
		goto fail;

	if (!progressive_context_reset(encoder->progressive))
		goto fail;

	encoder->codecs |= FREERDP_CODEC_PROGRESSIVE;
	return 1;
fail:
	progressive_context_free(encoder->progressive);
	return -1;
}

WINPR_ATTR_NODISCARD
static int shadow_encoder_init(rdpShadowEncoder* encoder)
{
	encoder->width = encoder->server->screen->width;
	encoder->height = encoder->server->screen->height;
	encoder->maxTileWidth = 64;
	encoder->maxTileHeight = 64;
	if (shadow_encoder_init_grid(encoder) < 0)
		return -1;

	if (!encoder->bs)
		encoder->bs = Stream_New(nullptr, 4ULL * encoder->maxTileWidth * encoder->maxTileHeight);

	if (!encoder->bs)
		return -1;

	return 1;
}

static int shadow_encoder_uninit_rfx(rdpShadowEncoder* encoder)
{
	if (encoder->rfx)
	{
		rfx_context_free(encoder->rfx);
		encoder->rfx = nullptr;
	}

	encoder->codecs &= (UINT32)~FREERDP_CODEC_REMOTEFX;
	return 1;
}

static int shadow_encoder_uninit_nsc(rdpShadowEncoder* encoder)
{
	if (encoder->nsc)
	{
		nsc_context_free(encoder->nsc);
		encoder->nsc = nullptr;
	}

	encoder->codecs &= (UINT32)~FREERDP_CODEC_NSCODEC;
	return 1;
}

static int shadow_encoder_uninit_planar(rdpShadowEncoder* encoder)
{
	if (encoder->planar)
	{
		freerdp_bitmap_planar_context_free(encoder->planar);
		encoder->planar = nullptr;
	}

	encoder->codecs &= (UINT32)~FREERDP_CODEC_PLANAR;
	return 1;
}

static int shadow_encoder_uninit_interleaved(rdpShadowEncoder* encoder)
{
	if (encoder->interleaved)
	{
		bitmap_interleaved_context_free(encoder->interleaved);
		encoder->interleaved = nullptr;
	}

	encoder->codecs &= (UINT32)~FREERDP_CODEC_INTERLEAVED;
	return 1;
}

static int shadow_encoder_uninit_h264(rdpShadowEncoder* encoder)
{
	if (encoder->h264)
	{
		h264_context_free(encoder->h264);
		encoder->h264 = nullptr;
	}

	encoder->codecs &= (UINT32) ~(FREERDP_CODEC_AVC420 | FREERDP_CODEC_AVC444);
	return 1;
}

static int shadow_encoder_uninit_progressive(rdpShadowEncoder* encoder)
{
	WINPR_ASSERT(encoder);
	if (encoder->progressive)
	{
		progressive_context_free(encoder->progressive);
		encoder->progressive = nullptr;
	}

	encoder->codecs &= (UINT32)~FREERDP_CODEC_PROGRESSIVE;
	return 1;
}

static int shadow_encoder_uninit(rdpShadowEncoder* encoder)
{
	shadow_encoder_uninit_grid(encoder);

	if (encoder->bs)
	{
		Stream_Free(encoder->bs, TRUE);
		encoder->bs = nullptr;
	}

	shadow_encoder_uninit_rfx(encoder);

	shadow_encoder_uninit_nsc(encoder);

	shadow_encoder_uninit_planar(encoder);

	shadow_encoder_uninit_interleaved(encoder);
	shadow_encoder_uninit_h264(encoder);

	shadow_encoder_uninit_progressive(encoder);

	return 1;
}

int shadow_encoder_reset(rdpShadowEncoder* encoder)
{
	int status = 0;
	UINT32 codecs = encoder->codecs;
	rdpContext* context = (rdpContext*)encoder->client;
	rdpSettings* settings = context->settings;
	status = shadow_encoder_uninit(encoder);

	if (status < 0)
		return -1;

	status = shadow_encoder_init(encoder);

	if (status < 0)
		return -1;

	status = shadow_encoder_prepare(encoder, codecs);

	if (status < 0)
		return -1;

	encoder->fps = 16;
	encoder->maxFps = 32;
	encoder->frameId = 0;
	encoder->lastAckframeId = 0;
	encoder->frameAck = freerdp_settings_get_bool(settings, FreeRDP_SurfaceFrameMarkerEnabled);
	return 1;
}

int shadow_encoder_prepare(rdpShadowEncoder* encoder, UINT32 codecs)
{
	int status = 0;

	if ((codecs & FREERDP_CODEC_REMOTEFX) && !(encoder->codecs & FREERDP_CODEC_REMOTEFX))
	{
		WLog_DBG(TAG, "initializing RemoteFX encoder");
		status = shadow_encoder_init_rfx(encoder);

		if (status < 0)
			return -1;
	}

	if ((codecs & FREERDP_CODEC_NSCODEC) && !(encoder->codecs & FREERDP_CODEC_NSCODEC))
	{
		WLog_DBG(TAG, "initializing NSCodec encoder");
		status = shadow_encoder_init_nsc(encoder);

		if (status < 0)
			return -1;
	}

	if ((codecs & FREERDP_CODEC_PLANAR) && !(encoder->codecs & FREERDP_CODEC_PLANAR))
	{
		WLog_DBG(TAG, "initializing planar bitmap encoder");
		status = shadow_encoder_init_planar(encoder);

		if (status < 0)
			return -1;
	}

	if ((codecs & FREERDP_CODEC_INTERLEAVED) && !(encoder->codecs & FREERDP_CODEC_INTERLEAVED))
	{
		WLog_DBG(TAG, "initializing interleaved bitmap encoder");
		status = shadow_encoder_init_interleaved(encoder);

		if (status < 0)
			return -1;
	}

	if ((codecs & (FREERDP_CODEC_AVC420 | FREERDP_CODEC_AVC444)) &&
	    !(encoder->codecs & (FREERDP_CODEC_AVC420 | FREERDP_CODEC_AVC444)))
	{
		WLog_DBG(TAG, "initializing H.264 encoder");
		status = shadow_encoder_init_h264(encoder);

		if (status < 0)
			return -1;
	}

	if ((codecs & FREERDP_CODEC_PROGRESSIVE) && !(encoder->codecs & FREERDP_CODEC_PROGRESSIVE))
	{
		WLog_DBG(TAG, "initializing progressive encoder");
		status = shadow_encoder_init_progressive(encoder);

		if (status < 0)
			return -1;
	}

	return 1;
}

rdpShadowEncoder* shadow_encoder_new(rdpShadowClient* client)
{
	rdpShadowEncoder* encoder = nullptr;
	rdpShadowServer* server = client->server;
	encoder = (rdpShadowEncoder*)calloc(1, sizeof(rdpShadowEncoder));

	if (!encoder)
		return nullptr;

	encoder->client = client;
	encoder->server = server;
	encoder->fps = 16;
	encoder->maxFps = 32;

	if (shadow_encoder_init(encoder) < 0)
	{
		shadow_encoder_free(encoder);
		return nullptr;
	}

	return encoder;
}

void shadow_encoder_free(rdpShadowEncoder* encoder)
{
	if (!encoder)
		return;

	shadow_encoder_uninit(encoder);
	free(encoder);
}
