#!/usr/bin/python
# -*- coding: utf8 -*-
# author: Brian Ernst

"""
This is an experimental script for fetching changelist details based on changelists
containing a specific search string of your choice. 
A future version of this script would generate unified diffs of the desired output.
"""

import argparse
import json
import os
import pathlib
import subprocess

# TODO: Use p4helper instead of adding this.
# TODO: Consider updating helpers to use json output instead of parsing the standard p4 output
def get_proc_output( args, path = None ):
    proc = subprocess.Popen( args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=path, encoding='utf-8' )
    proc.wait()
    data, err = proc.communicate()
    return data

def output_cls_with_string(directory = None):
    """
    Args:
        directory (str): This is the directory to limit scanning to, can be None. 
            MUST use Perforce syntax; if you want to scan directory must end with `/...` to search path
    """

    cwd = os.getcwd()

    command = f"p4 -ztag -Mj changes -L {directory if directory else ''}"

    wrote = False
    count = 0
    # TODO: update to arg output
    with open(pathlib.Path(cwd) / 'TODO_UPDATE_SCRIPT.log', 'w') as log_file:

        proc = subprocess.Popen( command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=cwd )
        for line in proc.stdout:
            j = json.loads(line)

            # TODO: update to arg search term
            if 'TODO_SEARCH_TERMS' not in j['desc'].lower():
                continue

            print(j)
            print()

            command2 = f"p4 describe {j['change']}"
            output = get_proc_output(command2, path=cwd)
            if wrote:
                log_file.write('\n\n\n\n')
            wrote = True
            log_file.write(output)
            log_file.flush()
            
            count += 1

if __name__ == "__main__":
    parser = argparse.ArgumentParser()

    parser.add_argument('-d', '--directory')

    args = parser.parse_args()

    output_cls_with_string(directory = args.directory)