import json
import argparse
import os
import csv
import sys

@staticmethod
def get_num_gpu():
    return 8
def load_json_files(directory):
    json_data = {}
    for root, _, files in os.walk(directory):
        for file in files:
            if file.endswith('json'):
                with open(directory+file, 'r') as f:
                    data = json.load(f)
                    json_data.setdefault('traceEvents',[]).append(data['traceEvents'])
    return json_data


def parse(json_file_path, output_file_name, function_name):

    data_all = load_json_files(json_file_path)
    data = data_all['traceEvents']

    kernels = []
    found = False
    for entries in data:
        for entry in entries:
            if  'name'in entry and 'cat' in entry and (entry['cat'] == 'kernel' ):
                if function_name == 'all':
                    kernels.append(entry)
                    found = True
                elif function_name in entry['name']:
                    kernels.append(entry)
                    found = True
    if not found:
        print('There is no ' + function_name +' in this log')
        return


    sorted_kernels = sorted(kernels, key=lambda x: ( x['ts'], x['pid']))

    csv_file_name = output_file_name + '.csv'
    json_file_out = output_file_name + '.json'

    json_data_out = {}
    json_data_out.setdefault('traceEvents',[]).append({})

    with open(csv_file_name, 'w', newline='') as csvfile:
        fieldnames = ['pid',  'dur', 'ts', 'min_dur', 'max_dur', 'min_start', 'max_start', 'latency_before_first_gpu', 'max_dur - min_dur', 'duration_from_last_arrival', 'first_gpu', 'last_gpu', 'shortest_gpu', 'longest_gpu']
        writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
        writer.writeheader()
        i = 1
        min_dur = sys.float_info.max
        max_dur = sys.float_info.min
        min_start = sys.float_info.max
        max_start = sys.float_info.min
        first_gpu = 0
        last_gpu = 0
        longest_gpu = 0
        shortest_gpu = 0
        for entry in sorted_kernels:
            record = {'pid': entry['pid'], 'dur': entry['dur'],
                    'ts': entry['ts']}
            json_data_out.setdefault('traceEvents',[]).append(entry)
            if entry['dur'] <  min_dur :
                min_dur = min(min_dur, entry['dur'])
                shortest_gpu = entry['pid']

            if entry['dur'] > max_dur :
                max_dur = max(max_dur, entry['dur'])
                longest_gpu = entry['pid']

            if entry['ts'] < min_start :
                min_start = min(min_start, entry['ts'])
                first_gpu = entry['pid']

            if entry['ts'] > max_start:
                 max_start = max(max_start, entry['ts'])
                 duration_from_last_arrival = entry['dur']
                 last_gpu = entry['pid']

            writer.writerow(record)
            if (i) % get_num_gpu() == 0:
                record = {'min_dur': min_dur, 'max_dur':max_dur, 'min_start':min_start, 'max_start':max_start,'latency_before_first_gpu':max_start-min_start,  'max_dur - min_dur':max_dur-min_dur , 'duration_from_last_arrival':duration_from_last_arrival , 'first_gpu': first_gpu, 'last_gpu':last_gpu, 'shortest_gpu':shortest_gpu, 'longest_gpu':longest_gpu}
                writer.writerow(record)
                csvfile.write('\n')
                min_dur = sys.float_info.max
                max_dur = sys.float_info.min
                min_start = sys.float_info.max
                max_start = sys.float_info.min
                first_gpu = 0
                last_gpu = 0
                longest_gpu = 0
                shortest_gpu = 0

                i = 0
            i = i + 1

        with open(json_file_out, 'w') as jsonfileout:
            json.dump(json_data_out, jsonfileout, indent=4)

    print(f"Data successfully written to {csv_file_name} and {json_file_out}.")

def main():
    parser = argparse.ArgumentParser(description='Json file and the function to parse.')

    parser.add_argument('json_file_path', metavar='file_path', type=str,  help='Path to the JSON file to process')
    parser.add_argument('output_file_name', type=str, help='Output File Name')
    parser.add_argument('function_name', type=str, help='Kernel Function Name, e.g., oneShotAllReduce, ncclDevKernel_Generic, mscclKernel')

    args = parser.parse_args()
    parse(args.json_file_path,  args.output_file_name, args.function_name)

if __name__ == '__main__':
    main()