#!/usr/bin/env python3
# Copyright (c) 2024, the R8 project authors. Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.

import historic_run
import perf
import utils

import argparse
import json
import os
import sys

TARGETS = ['r8-full']
NUM_COMMITS = 1000

FILES = [
    'chart.js', 'd8.html', 'dom.js', 'extensions.js', 'r8.html', 'retrace.html',
    'scales.js', 'state.js', 'stylesheet.css', 'url.js', 'utils.js'
]


def DownloadCloudBucket(dest):
    os.makedirs(dest)
    utils.download_file_from_cloud_storage(perf.GetGSLocation('*'),
                                           dest,
                                           concurrent=True,
                                           flags=['-R'])


def ParseJsonFromCloudStorage(filename, local_bucket):
    abs_path = os.path.join(local_bucket, filename)
    if not os.path.exists(abs_path):
        return None
    with open(abs_path, 'r') as f:
        lines = f.readlines()
        content = ''.join(lines)
        try:
            return json.loads(content)
        except:
            return None


def RecordBenchmarkResult(commit, benchmark, benchmark_info, local_bucket,
                          target, benchmarks):
    if not target in benchmark_info['targets']:
        return
    sub_benchmarks = benchmark_info.get('subBenchmarks', {})
    sub_benchmarks_for_target = sub_benchmarks.get(target, [])
    if sub_benchmarks_for_target:
        for sub_benchmark in sub_benchmarks_for_target:
            RecordSingleBenchmarkResult(commit, benchmark + sub_benchmark,
                                        local_bucket, target, benchmarks)
    else:
        RecordSingleBenchmarkResult(commit, benchmark, local_bucket, target,
                                    benchmarks)


def RecordSingleBenchmarkResult(commit, benchmark, local_bucket, target,
                                benchmarks):
    filename = perf.GetArtifactLocation(benchmark, target, commit.hash(),
                                        'result.json')
    benchmark_data = ParseJsonFromCloudStorage(filename, local_bucket)
    if benchmark_data:
        benchmarks[benchmark] = benchmark_data


def RecordBenchmarkResults(commit, benchmarks, benchmark_data):
    if benchmarks or benchmark_data:
        benchmark_data.append({
            'author': commit.author_name(),
            'hash': commit.hash(),
            'submitted': commit.committer_timestamp(),
            'title': commit.title(),
            'benchmarks': benchmarks
        })


def TrimBenchmarkResults(benchmark_data):
    new_benchmark_data_len = len(benchmark_data)
    while new_benchmark_data_len > 0:
        candidate_len = new_benchmark_data_len - 1
        if not benchmark_data[candidate_len]['benchmarks']:
            new_benchmark_data_len = candidate_len
        else:
            break
    return benchmark_data[0:new_benchmark_data_len]


def ArchiveBenchmarkResults(benchmark_data, dest, outdir, temp):
    # Serialize JSON to temp file.
    benchmark_data_file = os.path.join(temp, dest)
    with open(benchmark_data_file, 'w') as f:
        json.dump(benchmark_data, f)

    # Write output files to public bucket.
    perf.ArchiveOutputFile(benchmark_data_file,
                           dest,
                           header='Cache-Control:no-store',
                           outdir=outdir)


def run_bucket():
    # Get the N most recent commits sorted by newest first.
    top = utils.get_sha1_from_revision('origin/main')
    bottom = utils.get_nth_sha1_from_revision(NUM_COMMITS - 1, 'origin/main')
    commits = historic_run.enumerate_git_commits(top, bottom)
    assert len(commits) == NUM_COMMITS

    # Download all benchmark data from the cloud bucket to a temp folder.
    with utils.TempDir() as temp:
        local_bucket = os.path.join(temp, perf.BUCKET)
        DownloadCloudBucket(local_bucket)
        run(commits, local_bucket, temp)


def run_local(local_bucket):
    commit_hashes = set()
    for benchmark in os.listdir(local_bucket):
        benchmark_dir = os.path.join(local_bucket, benchmark)
        if not os.path.isdir(benchmark_dir):
            continue
        for target in os.listdir(benchmark_dir):
            target_dir = os.path.join(local_bucket, benchmark, target)
            if not os.path.isdir(target_dir):
                continue
            for commit_hash in os.listdir(target_dir):
                commit_hash_dir = os.path.join(local_bucket, benchmark, target,
                                               commit_hash)
                if not os.path.isdir(commit_hash_dir):
                    continue
                commit_hashes.add(commit_hash)
    commits = []
    for commit_hash in commit_hashes:
        commits.append(historic_run.git_commit_from_hash(commit_hash))
    commits.sort(key=lambda c: c.committer_timestamp(), reverse=True)
    with utils.TempDir() as temp:
        outdir = os.path.join(utils.TOOLS_DIR, 'perf')
        run(commits, local_bucket, temp, outdir=outdir)


def run(commits, local_bucket, temp, outdir=None):
    # Aggregate all the result.json files into a single file that has the
    # same format as tools/perf/benchmark_data.json.
    d8_benchmark_data = []
    r8_benchmark_data = []
    retrace_benchmark_data = []
    for commit in commits:
        d8_benchmarks = {}
        r8_benchmarks = {}
        retrace_benchmarks = {}
        for benchmark, benchmark_info in perf.ALL_BENCHMARKS.items():
            RecordBenchmarkResult(commit, benchmark, benchmark_info,
                                  local_bucket, 'd8', d8_benchmarks)
            RecordBenchmarkResult(commit, benchmark, benchmark_info,
                                  local_bucket, 'r8-full', r8_benchmarks)
            RecordBenchmarkResult(commit, benchmark, benchmark_info,
                                  local_bucket, 'retrace', retrace_benchmarks)
        RecordBenchmarkResults(commit, d8_benchmarks, d8_benchmark_data)
        RecordBenchmarkResults(commit, r8_benchmarks, r8_benchmark_data)
        RecordBenchmarkResults(commit, retrace_benchmarks,
                               retrace_benchmark_data)

    # Trim data.
    d8_benchmark_data = TrimBenchmarkResults(d8_benchmark_data)
    r8_benchmark_data = TrimBenchmarkResults(r8_benchmark_data)
    retrace_benchmark_data = TrimBenchmarkResults(retrace_benchmark_data)

    # Write output JSON files to public bucket, or to tools/perf/ if running
    # with --local-bucket.
    ArchiveBenchmarkResults(d8_benchmark_data, 'd8_benchmark_data.json', outdir,
                            temp)
    ArchiveBenchmarkResults(r8_benchmark_data, 'r8_benchmark_data.json', outdir,
                            temp)
    ArchiveBenchmarkResults(retrace_benchmark_data,
                            'retrace_benchmark_data.json', outdir, temp)

    # Write remaining files to public bucket.
    if outdir is None:
        for file in FILES:
            dest = os.path.join(utils.TOOLS_DIR, 'perf', file)
            perf.ArchiveOutputFile(dest, file)


def ParseOptions():
    result = argparse.ArgumentParser()
    result.add_argument('--local-bucket', help='Local results dir.')
    return result.parse_known_args()


def main():
    options, args = ParseOptions()
    if options.local_bucket:
        run_local(options.local_bucket)
    else:
        run_bucket()


if __name__ == '__main__':
    sys.exit(main())