# The COPYRIGHT file at the top level of this repository contains the full
# copyright notices and license terms.
from functools import wraps
from decimal import Decimal
from trytond.model import fields
from trytond.pyson import Eval
from trytond.pool import Pool
from trytond.transaction import Transaction
from trytond.exceptions import UserError
from trytond.i18n import gettext
try:
    from \
        trytond.modules.analytic_account_root_mandatory_bypass.analytic_account \
        import suppress_root_mandatory
except ModuleNotFoundError:
    def suppress_root_mandatory(func):

        @wraps(func)
        def wrapper(*args, **kwargs):
            return func(*args, **kwargs)

        return wrapper


class ApplyMethodCostMixin(object):
    __slots__ = ()

    invoice_party = fields.Many2One('party.party', 'Invoice Party',
        states={
            'invisible': ~Eval('apply_method', '').in_(
                ['invoice_in', 'invoice_out'])
        })

    @classmethod
    def __setup__(cls):
        super(ApplyMethodCostMixin, cls).__setup__()
        cls.apply_method.selection.append(('invoice_out', 'Invoice Out'))
        cls.apply_method.selection.append(('invoice_in', 'Invoice In'))


class ApplyMethodCostDocumentMixin(ApplyMethodCostMixin):
    __slots__ = ()

    @classmethod
    def __setup__(cls):
        super().__setup__()
        for fieldname in {'formula', 'amount', 'invoice_party'}:
            _field = getattr(cls, fieldname)
            if 'readonly' in _field.states:
                _field.states['readonly'] |= (Eval('invoice_lines', []))
            else:
                _field.states['readonly'] = (Eval('invoice_lines', []))

    @fields.depends('invoice_lines')
    def get_compute_formula(self, name=None):
        # do not compute amount if invoice lines exist
        return bool(super().get_compute_formula(name) and not self.invoice_lines)

    @classmethod
    def get_blocked_attributes(cls):
        return super(ApplyMethodCostDocumentMixin,
            cls).get_blocked_attributes() + ['invoice_party']

    @classmethod
    def _apply_method(cls, apply_method, costs):
        if apply_method in ['invoice_in', 'invoice_out']:
            for cost in costs:
                if cost.amount and not cost.invoice_party:
                    raise UserError(gettext(
                        'document_cost_apply_invoice.msg_document_cost_apply_invoice_invoice_no_party',
                        type_=cost.type_.rec_name,
                        cost=cost.rec_name if isinstance(
                            cost.document, tuple) else cost.document.rec_name))
            cls.create_invoice_lines(apply_method, costs)
        else:
            super(ApplyMethodCostDocumentMixin, cls)._apply_method(
                apply_method, costs)

    @classmethod
    def _unapply_method(cls, apply_method, costs):
        InvoiceLine = Pool().get('account.invoice.line')
        with Transaction().set_user(0, set_context=True):
            if apply_method in ['invoice_in', 'invoice_out']:
                lines = InvoiceLine.search([
                    ('origin.id', 'in', [c.id for c in costs], cls.__name__)])
                for line in lines:
                    if line.invoice:
                        raise UserError(gettext(
                            'document_cost_apply_invoice.msg_document_cost_apply_invoice_unapply_cost',
                            origin=line.origin.rec_name,
                            invoice=line.invoice.rec_name))
                if lines:
                    InvoiceLine.delete(lines)
            else:
                super(ApplyMethodCostDocumentMixin, cls)._unapply_method(
                    apply_method, costs)

    @classmethod
    @suppress_root_mandatory
    def create_invoice_lines(cls, apply_method, costs):
        pool = Pool()
        InvoiceLine = pool.get('account.invoice.line')

        lines = []
        for cost in costs:
            _lines = cost._get_invoice_lines(apply_method)
            if not _lines:
                continue
            lines.extend(_lines)

        with Transaction().set_user(0, set_context=True):
            InvoiceLine.save(lines)
        return lines

    def _get_invoice_lines(self, apply_method):
        pool = Pool()
        InvoiceLine = pool.get('account.invoice.line')

        if not self.amount or self.invoice_lines:
            return []
        line = InvoiceLine()
        line.type = 'line'
        line.invoice = None
        line.invoice_type = apply_method[8:]
        if isinstance(self.document, tuple):
            line.company = self.company
            line.currency = self.currency
        else:
            line.company = self.document.company
            line.currency = self.document.company.currency
        line.party = self.invoice_party
        if self.type_.product:
            line.product = self.type_.product
            line.unit = self.type_.product.default_uom
            line.on_change_product()
        else:
            line.account = self.type_.account_used
            line.on_change_account()

        line.origin = self
        line.quantity = self.quantity
        digits = InvoiceLine.unit_price.digits[1]
        line.unit_price = ((self.amount
                / (Decimal(str(self.quantity)) if self.quantity
                    else Decimal('1.0'))
                ) * (-1 if line.invoice_type == 'out' else 1)).quantize(
                Decimal(10) ** -Decimal(digits))
        line.amount = line.on_change_with_amount()
        return [line]


class ApplyInvoiceAccountMixin(object):
    __slots__ = ()

    @classmethod
    def _account_domain(cls):
        InvoiceLine = Pool().get('account.invoice.line')
        res = super()._account_domain()
        return [
            ('invoice_out', [
                InvoiceLine._account_domain('out')]),
            ('invoice_in', [
                InvoiceLine._account_domain('in')]),
        ] + res