from collections import OrderedDict

from .models import FormFieldConfig


DEFAULT_FIELD_ORDER = {
    'onboarding': [
        'first_name',
        'last_name',
        'full_name',
        'gender',
        'job_title',
        'department',
        'work_email',
        'order_business_cards',
        'business_card_name',
        'business_card_title',
        'business_card_email',
        'business_card_phone',
        'contract_start',
        'employment_type',
        'employment_end_date',
        'handover_date',
        'group_mailboxes_required_choice',
        'group_mailboxes',
        'needed_devices_multi',
        'additional_hardware_needed_choice',
        'additional_hardware_multi',
        'additional_hardware_other',
        'needed_software_multi',
        'additional_software_needed_choice',
        'additional_software_multi',
        'additional_software',
        'needed_accesses_multi',
        'additional_access_needed_choice',
        'additional_access_text',
        'needed_workspace_groups_multi',
        'needed_resources_multi',
        'successor_required_choice',
        'successor_name',
        'inherit_phone_number_choice',
        'phone_number_choice',
        'additional_notes',
        'signature_url',
        'signature_image',
        'onboarded_by_email',
        'agreement_confirm',
    ],
    'offboarding': [
        'full_name',
        'work_email',
        'department',
        'job_title',
        'last_working_day',
        'notes',
    ],
}

ONBOARDING_PAGE_ORDER = ['stammdaten', 'vertrag', 'itsetup', 'abschluss']
ONBOARDING_PAGE_LABELS = {
    'stammdaten': '1. Stammdaten',
    'vertrag': '2. Vertrag',
    'itsetup': '3. IT-Setup',
    'abschluss': '4. Abschluss',
}

LOCKED_FIELD_RULES = {
    'onboarding': {'full_name', 'work_email', 'contract_start', 'agreement_confirm'},
    'offboarding': {'full_name', 'work_email', 'last_working_day'},
}

ONBOARDING_DEFAULT_PAGE = {
    'first_name': 'stammdaten',
    'last_name': 'stammdaten',
    'full_name': 'stammdaten',
    'gender': 'stammdaten',
    'job_title': 'stammdaten',
    'department': 'stammdaten',
    'work_email': 'stammdaten',
    'order_business_cards': 'stammdaten',
    'business_card_name': 'stammdaten',
    'business_card_title': 'stammdaten',
    'business_card_email': 'stammdaten',
    'business_card_phone': 'stammdaten',
    'contract_start': 'vertrag',
    'employment_type': 'vertrag',
    'employment_end_date': 'vertrag',
    'handover_date': 'vertrag',
    'group_mailboxes_required_choice': 'vertrag',
    'group_mailboxes': 'vertrag',
    'needed_devices_multi': 'itsetup',
    'additional_hardware_needed_choice': 'itsetup',
    'additional_hardware_multi': 'itsetup',
    'additional_hardware_other': 'itsetup',
    'needed_software_multi': 'itsetup',
    'additional_software_needed_choice': 'itsetup',
    'additional_software_multi': 'itsetup',
    'additional_software': 'itsetup',
    'needed_accesses_multi': 'itsetup',
    'additional_access_needed_choice': 'itsetup',
    'additional_access_text': 'itsetup',
    'needed_workspace_groups_multi': 'itsetup',
    'needed_resources_multi': 'itsetup',
    'successor_required_choice': 'itsetup',
    'successor_name': 'itsetup',
    'inherit_phone_number_choice': 'itsetup',
    'phone_number_choice': 'itsetup',
    'additional_notes': 'abschluss',
    'signature_url': 'abschluss',
    'signature_image': 'abschluss',
    'onboarded_by_email': 'abschluss',
    'agreement_confirm': 'abschluss',
}


def _default_sort(form_type: str, field_name: str) -> int:
    ordered = DEFAULT_FIELD_ORDER.get(form_type, [])
    if field_name in ordered:
        return ordered.index(field_name)
    return len(ordered) + 500


def _ensure_configs(form_type: str, field_names: list[str]) -> dict[str, FormFieldConfig]:
    existing = {
        cfg.field_name: cfg
        for cfg in FormFieldConfig.objects.filter(form_type=form_type, field_name__in=field_names)
    }
    missing_names = [name for name in field_names if name not in existing]
    if missing_names:
        FormFieldConfig.objects.bulk_create(
            [
                FormFieldConfig(
                    form_type=form_type,
                    field_name=name,
                    sort_order=_default_sort(form_type, name),
                    page_key=ONBOARDING_DEFAULT_PAGE.get(name, '') if form_type == 'onboarding' else '',
                )
                for name in missing_names
            ],
            ignore_conflicts=True,
        )
        existing = {
            cfg.field_name: cfg
            for cfg in FormFieldConfig.objects.filter(form_type=form_type, field_name__in=field_names)
        }
    return existing


def ensure_form_field_configs(form_type: str, field_names: list[str]) -> dict[str, FormFieldConfig]:
    return _ensure_configs(form_type, field_names)


def apply_form_field_config(form_type: str, form) -> None:
    field_names = list(form.fields.keys())
    configs = _ensure_configs(form_type, field_names)
    locked = LOCKED_FIELD_RULES.get(form_type, set())

    for field_name, field in list(form.fields.items()):
        cfg = configs.get(field_name)
        if not cfg:
            continue

        if cfg.label_override.strip():
            field.label = cfg.label_override.strip()

        if cfg.help_text_override.strip():
            field.help_text = cfg.help_text_override.strip()

        if field_name not in locked and cfg.is_required is not None:
            field.required = cfg.is_required

        if field_name not in locked and not cfg.is_visible:
            form.fields.pop(field_name, None)

    ordered_items = sorted(
        form.fields.items(),
        key=lambda item: (
            configs[item[0]].sort_order if item[0] in configs else _default_sort(form_type, item[0]),
            item[0],
        ),
    )
    form.fields = OrderedDict(ordered_items)
    if form_type == 'onboarding':
        form._field_page_keys = {
            name: (configs[name].page_key or ONBOARDING_DEFAULT_PAGE.get(name, 'abschluss'))
            for name in form.fields.keys()
            if name in configs
        }