# Copyright 2017 LasLabs Inc.
# Copyright 2018 ACSONE SA/NV.
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from odoo import _, fields, api, models
from odoo.exceptions import ValidationError


class SaleOrder(models.Model):
    _inherit = 'sale.order'

    is_contract = fields.Boolean(
        string='Is a contract', compute='_compute_is_contract'
    )
    contract_count = fields.Integer(compute='_compute_contract_count')
    need_contract_creation = fields.Boolean(
        compute='_compute_need_contract_creation'
    )

    @api.constrains('state')
    def check_contact_is_not_terminated(self):
        for rec in self:
            if rec.state not in (
                'sale',
                'done',
                'cancel',
            ) and rec.order_line.filtered('contract_id.is_terminated'):
                raise ValidationError(
                    _("You can't upsell or downsell a terminated contract")
                )

    @api.depends('order_line.contract_id', 'state')
    def _compute_need_contract_creation(self):
        for rec in self:
            if rec.state in ('sale', 'done'):
                line_to_create_contract = rec.order_line.filtered(
                    lambda r: not r.contract_id and r.product_id.is_contract
                )
                line_to_update_contract = rec.order_line.filtered(
                    lambda r: r.contract_id
                    and r.product_id.is_contract
                    and r
                    not in r.contract_id.contract_line_ids.mapped(
                        'sale_order_line_id'
                    )
                )
                if line_to_create_contract or line_to_update_contract:
                    rec.need_contract_creation = True

    @api.depends('order_line')
    def _compute_is_contract(self):
        self.is_contract = any(self.order_line.mapped('is_contract'))

    @api.multi
    def _prepare_contract_value(self, contract_template):
        self.ensure_one()
        return {
            'name': '{template_name}: {sale_name}'.format(
                template_name=contract_template.name, sale_name=self.name
            ),
            'partner_id': self.partner_id.id,
            'company_id': self.company_id.id,
            'contract_template_id': contract_template.id,
            'user_id': self.user_id.id,
            'payment_term_id': self.payment_term_id.id,
            'fiscal_position_id': self.fiscal_position_id.id,
            'invoice_partner_id': self.partner_invoice_id.id,
        }

    @api.multi
    def action_create_contract(self):
        contract_model = self.env['contract.contract']
        contracts = self.env['contract.contract']
        for rec in self.filtered('is_contract'):
            line_to_create_contract = rec.order_line.filtered(
                lambda r: not r.contract_id and r.product_id.is_contract
            )
            line_to_update_contract = rec.order_line.filtered(
                lambda r: r.contract_id
                and r.product_id.is_contract
                and r
                not in r.contract_id.contract_line_ids.mapped(
                    'sale_order_line_id'
                )
            )
            contract_templates = self.env["contract.template"]
            for order_line in line_to_create_contract:
                contract_template = order_line.product_id.with_context(
                    force_company=rec.company_id.id
                ).property_contract_template_id
                if not contract_template:
                    raise ValidationError(
                        _("You must specify a contract "
                          "template for '{}' product in '{}' company.").format(
                            order_line.product_id.name,
                            rec.company_id.name
                        )
                    )
                contract_templates |= contract_template
            for contract_template in contract_templates:
                order_lines = line_to_create_contract.filtered(
                    lambda r, template=contract_template:
                        r.product_id.with_context(
                            force_company=r.order_id.company_id.id
                        ).property_contract_template_id == template
                )
                contract = contract_model.create(
                    rec._prepare_contract_value(contract_template)
                )
                contracts |= contract
                contract._onchange_contract_template_id()
                contract._onchange_contract_type()
                order_lines.create_contract_line(contract)
                order_lines.write({'contract_id': contract.id})
            for line in line_to_update_contract:
                line.create_contract_line(line.contract_id)
        return contracts

    @api.multi
    def action_confirm(self):
        """ If we have a contract in the order, set it up """
        self.filtered(
            lambda order: (
                order.company_id.create_contract_at_sale_order_confirmation
            )
        ).action_create_contract()
        return super(SaleOrder, self).action_confirm()

    @api.multi
    @api.depends("order_line")
    def _compute_contract_count(self):
        for rec in self:
            rec.contract_count = len(
                rec.order_line.mapped('contract_id').filtered(
                    lambda r: r.active))

    @api.multi
    def action_show_contracts(self):
        self.ensure_one()
        action = self.env.ref(
            "contract.action_customer_contract"
        ).read()[0]
        contracts = (
            self.env['contract.line']
            .search([('sale_order_line_id', 'in', self.order_line.ids)])
            .mapped('contract_id')
        )
        action["domain"] = [("id", "in", contracts.ids)]
        if len(contracts) == 1:
            # If there is only one contract, open it directly
            action.update(
                {
                    "res_id": contracts.id,
                    "view_mode": "form",
                    "views": filter(
                        lambda view: view[1] == 'form', action['views']
                    ),
                }
            )
        return action