import os
import sys
import xlrd
import json
import time
import errno
import socket
import argparse
import datetime

import ConsoleUtils

_name = 'AutoManifest'
_descript = 'Automatically generates a manifest file with the given configuration.'
_auth = 'Chris Diesch <cdiesch@sequencelogic.net>'
_version = '0.1.0'
_date = '2017/11/16'
_usage = 'auto-manifest.py -i,--in-file {IN_FILE} -o,--out-file {OUT_FILE} [OPTIONS...]'

_parser = argparse.ArgumentParser(prog=_name, description=_descript, usage=_usage)
args = None

_printer = ConsoleUtils.SLPrinter(_name)
sys.stdout = _printer

_data = {}
_date_created = '%s-7:00' % (datetime.datetime.now().strftime('%Y-%m-%dT%H:%M:%S'))
_job_type = 'loan'
_type = 'SNT_JOB'
_work_order = 'basic_cns'

_ip_addr = socket.gethostbyname(socket.gethostname())
_job_id = 'test'

_originator = {
    'ipAddress': _ip_addr,
    'jobId': _job_id
}
_packages = []

_MANIFEST_DATA = []


def _to_manifest(pkg_name, pkg_files):
    out_path = os.path.join(root_directory, pkg_name.split('_')[1], 'manifest.json')
    result = {
        'data': _data,
        'dateCreated': _date_created,
        'jobType': _job_type,
        'type': _type,
        'workOrderName': _work_order,
        'originator': {
            'ipAddress': _ip_addr,
            'jobId': '%s-test' % pkg_name
        },
        'packages': [
            {
                'data': {
                    'package_name': pkg_name
                },
                'files': pkg_files
            }
        ]
    }

    print('Writing output for package %s to %s' % (pkg_name, out_path))
    try:
        with open(out_path, 'w+') as writer:
            json.dump(result, writer, indent=3)
    except Exception as err:
        print('Failed to write file:')
        print('  %s' % str(err))


def _load_xl_file(file_path):
    result = []

    wb = xlrd.open_workbook(file_path)
    sh = wb.sheet_by_index(0)
    keys = [str(c.value) for c in sh.row(0)]

    for i in range(1, sh.nrows):
        row_dict = {}
        for j in range(sh.ncols):
            row_dict[keys[j]] = sh.cell(i, j).value
        result.append(row_dict)

    return result


def _get_package_files(root_dir, xl_data):

    result = {}
    num_files = 0

    start_time = time.time()
    for row in xl_data:
        package_file_dir = str(row['Servicer Loan #'])
        if package_file_dir.endswith('.0'):
            package_file_dir = package_file_dir[:-2]

        package_name = '%s_%s' % (row['FNMA LOAN NUMBER'], package_file_dir)
        sub_folder = os.path.join(root_dir, package_file_dir)

        if not os.path.exists(sub_folder):
            print('There is no subfolder at %s' % sub_folder)

        else:
            files = [f for f in os.listdir(sub_folder) if _is_valid_file(f)]
            # files = [os.path.relpath(os.path.join(sub_folder, f), root_dir)
            #          for f in os.listdir(sub_folder) if _is_valid_file(f)]
            result[package_name] = files
            print('Loaded %d files for package "%s"' % (len(files), package_name))
            num_files += len(files)

    run_time = time.time() - start_time
    rate = num_files / run_time

    _printer.write_no_prefix('')
    print('Loaded %d files for %d packages in %.4f s (%.0f files/s)' % (num_files, len(result), run_time, rate))
    _printer.write_no_prefix('')

    return result


def _is_valid_file(file_name):
    is_valid = file_name.lower().endswith('.tif') or \
               file_name.lower().endswith('.pdf') or \
               file_name.lower().endswith('.tiff')

    if not is_valid:
        print('  Found invalid file (not pdf or tif): %s' % file_name)

    return is_valid


def _make_pkg_manifest(xl_data):
    for pkg_name, pkg_files in xl_data.items():
        _to_manifest(pkg_name, pkg_files)


def get_package_data_from_xl(xl_file):
    """
    Loads the package information given an excel file in the parent folder of input packages.

    Args:
        ``xl_file`` -- ``str`` The path to the excel file to load.

    Returns:
        ``dict`` -- A dict with key's equal to the desired package name & values equal to a list of the files which
            make up said package.

    """

    if not (os.path.exists(xl_file) and os.path.isfile(xl_file)):
        raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), xl_file)

    try:
        xl_dict = _load_xl_file(xl_file)

    except xlrd.XLRDError as xl_ex:
        print('Encountered error reading excel file:')
        print('  %s' % str(xl_ex))
        return {}

    parent_dir = os.path.split(xl_file)[0]

    result_dict = _get_package_files(parent_dir, xl_dict)
    return result_dict


def main():
    data = get_package_data_from_xl(args.in_file)
    _make_pkg_manifest(data)


def _show_args():
    print('Loading package data from: %s' % args.in_file)
    print('Saving manifest result to: %s' % args.out_file)
    _printer.write_no_prefix('')
    print('Setting work order to: "%s"' % _work_order)
    print('Setting manifest type to: "%s"' % _type)
    print('Setting job ID to: "%s"' % _job_id)
    print('Setting job type to: "%s"' % _job_type)
    _printer.write_no_prefix('')


def _make_args():
    _parser.add_argument('-i', '--in-file')
    _parser.add_argument('-o', '--out-file')


def _check_args():
    fatal_error = False

    if not os.path.exists(args.in_file):
        print('Error: The given input file does not exist %s' % args.in_file)
        fatal_error = True

    if fatal_error:
        print('Encountered fatal error checking arguments.')
        print('Exiting....')
        exit(-1)


if __name__ == '__main__':
    prog_start = time.time()

    _printer.write_no_prefix(ConsoleUtils.get_header(_name, _version, _date, _auth))
    _make_args()
    args = _parser.parse_args()
    _check_args()

    root_directory = os.path.split(args.in_file)[0]

    _show_args()
    status = 0
    try:
        main()

    except Exception as prog_err:
        print('Encountered fatal error while processing:')
        print('  %s' % str(prog_err))
        status = -1
    finally:

        prog_run = time.time() - prog_start
        print('Finished processing in %.4fs' % prog_run)
        print('Exiting with status %d' % status)
        exit(status)