import sys
import argparse
import logging
import configparser
from pprint import pp

from time import time
from datetime import timedelta

from pathlib import Path
from distutils import dir_util
import subprocess as sp

_t0 = time()
parser = argparse.ArgumentParser(
    description='Run the OpenFoam simulation'
)
parser.add_argument('-c', '--config', default='config.ini', type=Path,
    help='Configuration file (default config.ini)')
parser.add_argument('-l', '--log-level', default='INFO', type=str,
    help='Log level')

args = parser.parse_args()

config = configparser.ConfigParser()
config.read(args.config)

logging.basicConfig(
    filename=config['main'].get('log_file', None),
    level=args.log_level
)
log = logging.getLogger('openfoam')

log.info('Starting program')

input_dir = Path(config['main']['input_dir'], config['main']['case'])
work_dir = Path(config['main']['work_dir'])

if not work_dir.exists():
    log.error(f'Work directory ({work_dir}) not found')
    sys.exit(1)
    
case_dir = work_dir.joinpath(config['main']['case'])
if case_dir.exists():
    log.info(f'Deleting case ({case_dir})')
    dir_util.remove_tree(str(case_dir))

log.info(f'Copying case ({input_dir} -> {case_dir})')
dir_util.copy_tree(
    str(input_dir),
    str(case_dir),
)

if config['blockMesh'].getboolean('enable'):
    log.info('Running blockMesh')
    blockmesh_log = logging.getLogger('blockMesh')
    proc = sp.Popen(
        ('blockMesh'),
        cwd=case_dir,
        stdout=sp.PIPE,
        stderr=sp.PIPE,
        text=True,
    )
    for line in proc.stdout:
        blockmesh_log.info(line[:-1])
    for line in proc.stderr:
        blockmesh_log.error(line[:-1])
    code = proc.wait()
    if code != 0:
        log.error('blockMesh failed')
        sys.exit(code)
    log.info(f'blockMesh finished successfully')

if config['snappyHexMesh'].getboolean('enable'):
    log.info('Running snappyHexMesh')
    snappy_log = logging.getLogger('snappyHexMesh')
    proc = sp.Popen(
        ('snappyHexMesh', '-overwrite'),
        cwd=case_dir,
        stdout=sp.PIPE,
        stderr=sp.PIPE,
        text=True,
    )
    for line in proc.stdout:
        snappy_log.info(line[:-1])
    for line in proc.stderr:
        snappy_log.error(line[:-1])
    code = proc.wait()
    if code != 0:
        log.error('snappyHexMesh failed')
        sys.exit(code)
    log.info(f'snappyHexMesh finished successfully')

log.info('Copying 0.org -> 0')
dir_util.copy_tree(
    str(case_dir.joinpath('0.org')),
    str(case_dir.joinpath('0')),
)

if config['setFields'].getboolean('enable'):
    log.info('Running setFields')
    setfields_log = logging.getLogger('setFields')
    proc = sp.Popen(
        ('setFields'),
        cwd=case_dir,
        stdout=sp.PIPE,
        stderr=sp.PIPE,
        text=True,
    )
    for line in proc.stdout:
        setfields_log.info(line[:-1])
    for line in proc.stderr:
        setfields_log.info(line[:-1])
    code = proc.wait()
    if code != 0:
        log.error('setFields failed')
        sys.exit(code)
    log.info(f'setFields finished successfully')

if config['olaFlow'].getboolean('enable'):
    cmd = ('olaFlow')
    if config['parallel'].getboolean('enable'):
        cmd = (
            'mpirun',
            '-np', config['parallel'].getint('threads'),
            'olaFlow', '-parallel'
        )
        decpar_log = logging.getLogger('decomposePar')
        proc = sp.Popen(
            ('decomposePar'),
            cwd=case_dir,
            stdout=sp.PIPE,
            stderr=sp.PIPE,
            text=True,
        )
        for line in proc.stdout:
            decpar_log.info(line[:-1])
        for line in proc.stderr:
            decpar_log.error(line[:-1])
        code = proc.wait()
        if code != 0:
            log.error('decomposePar failed')
            sys.exit(code)
        log.info(f'decomposePar finished successfully')

    log.info('Running olaFlow')
    olaflow_log = logging.getLogger('olaFlow')
    proc = sp.Popen(
        cmd,
        cwd=case_dir,
        stdout=sp.PIPE,
        stderr=sp.PIPE,
        text=True,
    )
    for line in proc.stdout:
        olaflow_log.info(line[:-1])
    for line in proc.stderr:
        olaflow_log.error(line[:-1])
    code = proc.wait()
    if code != 0:
        log.error('olaFlow failed')
        sys.exit(code)
    log.info(f'olaFlow finished successfully')

    if config['parallel'].getboolean('enable') \
        and config['reconstructPar'].getboolean('enable'):
        recpar_log = logging.getLogger('reconstructPar')
        proc = sp.Popen(
            ('reconstructPar'),
            cwd=case_dir,
            stdout=sp.PIPE,
            stderr=sp.PIPE,
            text=True,
        )
        for line in proc.stdout:
            recpar_log.info(line[:-1])
        for line in proc.stderr:
            recpar_log.error(line[:-1])
        code = proc.wait()
        if code != 0:
            log.error('reconstructPar failed')
            sys.exit(code)
        log.info(f'reconstructPar finished successfully')

        log.info(f'Deleting processor directories')
        for proc_dir in case_dir.glob(r'processor*'):
            log.info(f'Deleting {proc_dir}')
            dir_util.remove_tree(str(proc_dir))

_t1 = time()
log.info(f'Program ended successfully after {timedelta(seconds=_t1-_t0)}')