"""E-mail related constants."""

from collections import namedtuple

EmailNotifications = namedtuple(
    'email_notifications', ('failure_type', 'subject', 'reason', 'fix_text'))


NOTIFICATION_TEXT_PATTERNS = {
    'verification_failed': (
        'File "{file_name}" validation failed due to '
        '{reason_text}.\n{fix_text}.'),
    'processing_failed': (
        'File "{file_name}" processing failed due to {reason_text}.\n'
        '{fix_text}.'),
    'processing_succeeded': (
        'File "{file_name}" has been processed successfully. Data from the '
        'file is now available in the DB.'
    ),
    'processing_partially_succeeded': (
        'File "{file_name}" has been partially processed. Data from the file '
        'is now available in the DB.\n\nPlease note that some records '
        'could not be processed and were skipped.\n\n'
        '{reason_text}\n\n{fix_text}.\n'
    )
}


ERROR_CODE_TEXT_MAPPING = {
    'wrong_file_size_error': EmailNotifications(
        'verification_failed',
        'Uploaded file "{file_name}" validation failed',
        'file size limit excess',
        'Please split the file into 2 or more of up to 450 MB and try again'),
    'wrong_file_type_error': EmailNotifications(
        'verification_failed',
        'Uploaded file "{file_name}" validation failed',
        'invalid file type',
        'Supported file types are ".TXT", ".CSV" and ".TSV" only'),
    'missing_data': EmailNotifications(
        'processing_failed',
        'Sales file "{file_name}" processing failed',
        'missing data',
        'Please make sure that file has a data in it and upload it again'),
    'invalid_file_structure': EmailNotifications(
        'processing_failed',
        'Sales file "{file_name}" processing failed',
        'invalid file structure',
        'Please make sure that file contains all the necessary fields '
        'and upload it again'),
    'encoding_not_identified': EmailNotifications(
        'processing_failed',
        'Sales file "{file_name}" processing failed',
        'encoding issue',
        'Please check the file, re-save it with "UTF-8", "windows1252" or '
        '"iso-8859-1" encoding, and upload again. If issue persists, '
        'contact IT department'),
    'database_error': EmailNotifications(
        'processing_failed',
        'Sales file "{file_name}" processing failed',
        'system issue',
        'Please try again. If issue persists, contact IT department'),
    'file_processing_error': EmailNotifications(
        'processing_failed',
        'Sales file "{file_name}" processing failed',
        'system issue',
        'Please try again. If issue persists, contact IT department'),
    'processing_succeeded': EmailNotifications(
        'processing_succeeded',
        'Sales file "{file_name}" has been processed successfully',
        '',
        ''),
    'processing_partially_succeeded': EmailNotifications(
        'processing_partially_succeeded',
        'Sales file "{file_name}" has been processed successfully, '
        'some records were skipped\n',
        '',
        'Correct the records manually and either reupload the file '
        '"{file_name}" or create a new file with corrected records only and '
        'upload it with new name (for example, "{file_name_timestamp}" '
        'or "{file_name_1}")'),
    'content_does_not_match_headers': EmailNotifications(
        'processing_partially_succeeded',
        '',
        'Error: Number of fields in the row doesn\'t match the number of '
        'fields in the header.',
        ''),
    'missing_mandatory_fields': EmailNotifications(
        'processing_partially_succeeded',
        '',
        'Error: Mandatory field value is missing.',
        ''),
    'partial_processing_errors': EmailNotifications(
        'processing_partially_succeeded',
        '',
        'Error: Unexpected error in the row.',
        ''),
    'data_validation_error': EmailNotifications(
        'processing_partially_succeeded',
        '',
        'Error: Invalid value in the field.',
        ''),
}