/*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "BenchTimer.h"
#include "SkCommandLineFlags.h"
#include "SkForceLinking.h"
#include "SkGraphics.h"
#include "SkOSFile.h"
#include "SkPicture.h"
#include "SkPictureRecorder.h"
#include "SkRecording.h"
#include "SkStream.h"
#include "SkString.h"
#include "LazyDecodeBitmap.h"

__SK_FORCE_IMAGE_DECODER_LINKING;

// Just reading all the SKPs takes about 2 seconds for me, which is the same as about 100 loops of
// rerecording all the SKPs.  So we default to --loops=900, which makes ~90% of our time spent in
// recording, and this should take ~20 seconds to run.

DEFINE_string2(skps, r, "skps", "Directory containing SKPs to read and re-record.");
DEFINE_int32(loops, 900, "Number of times to re-record each SKP.");
DEFINE_bool(endRecording, true, "If false, don't time SkPicture::endRecording()");
DEFINE_int32(nullSize, 1000, "Pretend dimension of null source picture.");
DEFINE_int32(tileGridSize, 512, "Set the tile grid size. Has no effect if bbh is not set to tilegrid.");
DEFINE_string(bbh, "", "Turn on the bbh and select the type, one of rtree, tilegrid, quadtree");
DEFINE_bool(skr, false, "Record SKR instead of SKP.");
DEFINE_string(match, "", "The usual filters on file names of SKPs to bench.");
DEFINE_string(timescale, "us", "Print times in ms, us, or ns");

static double scale_time(double ms) {
    if (FLAGS_timescale.contains("us")) ms *= 1000;
    if (FLAGS_timescale.contains("ns")) ms *= 1000000;
    return ms;
}

static SkBBHFactory* parse_FLAGS_bbh() {
    if (FLAGS_bbh.isEmpty()) {
        return NULL;
    }

    if (FLAGS_bbh.contains("rtree")) {
        return SkNEW(SkRTreeFactory);
    }
    if (FLAGS_bbh.contains("tilegrid")) {
        SkTileGridFactory::TileGridInfo info;
        info.fTileInterval.set(FLAGS_tileGridSize, FLAGS_tileGridSize);
        info.fMargin.setEmpty();
        info.fOffset.setZero();
        return SkNEW_ARGS(SkTileGridFactory, (info));
    }
    if (FLAGS_bbh.contains("quadtree")) {
        return SkNEW(SkQuadTreeFactory);
    }
    SkDebugf("Invalid bbh type %s, must be one of rtree, tilegrid, quadtree.\n", FLAGS_bbh[0]);
    return NULL;
}

static void bench_record(SkPicture* src, const char* name, SkBBHFactory* bbhFactory) {
    BenchTimer timer;
    timer.start();
    const int width  = src ? src->width()  : FLAGS_nullSize;
    const int height = src ? src->height() : FLAGS_nullSize;

    for (int i = 0; i < FLAGS_loops; i++) {
        if (FLAGS_skr) {
            EXPERIMENTAL::SkRecording recording(width, height);
            if (NULL != src) {
                src->draw(recording.canvas());
            }
            // Release and delete the SkPlayback so that recording optimizes its SkRecord.
            SkDELETE(recording.releasePlayback());
        } else {
            SkPictureRecorder recorder;
            SkCanvas* canvas = recorder.beginRecording(width, height, bbhFactory);
            if (NULL != src) {
                src->draw(canvas);
            }
            if (FLAGS_endRecording) {
                SkAutoTUnref<SkPicture> dst(recorder.endRecording());
            }
        }
    }
    timer.end();

    const double msPerLoop = timer.fCpu / (double)FLAGS_loops;
    printf("%f\t%s\n", scale_time(msPerLoop), name);
}

int tool_main(int argc, char** argv);
int tool_main(int argc, char** argv) {
    SkCommandLineFlags::Parse(argc, argv);
    SkAutoGraphics autoGraphics;

    if (FLAGS_bbh.count() > 1) {
        SkDebugf("Multiple bbh arguments supplied.\n");
        return 1;
    }

    SkAutoTDelete<SkBBHFactory> bbhFactory(parse_FLAGS_bbh());
    bench_record(NULL, "NULL", bbhFactory.get());
    if (FLAGS_skps.isEmpty()) {
        return 0;
    }

    SkOSFile::Iter it(FLAGS_skps[0], ".skp");
    SkString filename;
    bool failed = false;
    while (it.next(&filename)) {
        if (SkCommandLineFlags::ShouldSkip(FLAGS_match, filename.c_str())) {
            continue;
        }

        const SkString path = SkOSPath::SkPathJoin(FLAGS_skps[0], filename.c_str());

        SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path.c_str()));
        if (!stream) {
            SkDebugf("Could not read %s.\n", path.c_str());
            failed = true;
            continue;
        }
        SkAutoTUnref<SkPicture> src(
            SkPicture::CreateFromStream(stream, sk_tools::LazyDecodeBitmap));
        if (!src) {
            SkDebugf("Could not read %s as an SkPicture.\n", path.c_str());
            failed = true;
            continue;
        }
        bench_record(src, filename.c_str(), bbhFactory.get());
    }
    return failed ? 1 : 0;
}

#if !defined SK_BUILD_FOR_IOS
int main(int argc, char * const argv[]) {
    return tool_main(argc, (char**) argv);
}
#endif