# Copyright 2016 ACSONE SA/NV (<http://acsone.eu>)
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

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


class DateRange(models.Model):
    _name = "date.range"
    _description = "Date Range"
    _order = "type_name,date_start"

    @api.model
    def _default_company(self):
        return self.env['res.company']._company_default_get('date.range')

    name = fields.Char(required=True, translate=True)
    date_start = fields.Date(string='Start date', required=True)
    date_end = fields.Date(string='End date', required=True)
    type_id = fields.Many2one(
        comodel_name='date.range.type', string='Type', index=1, required=True,
        ondelete='restrict', domain="['|', ('company_id', '=', company_id), "
                                    "('company_id', '=', False)]")
    type_name = fields.Char(
        related='type_id.name', readonly=True, store=True, string="Type Name")
    company_id = fields.Many2one(
        comodel_name='res.company', string='Company', index=1,
        default=_default_company)
    active = fields.Boolean(
        help="The active field allows you to hide the date range without "
        "removing it.", default=True)

    _sql_constraints = [
        ('date_range_uniq', 'unique (name,type_id, company_id)',
         'A date range must be unique per company !')]

    @api.onchange('company_id', 'type_id')
    def _onchange_company_id(self):
        if self.company_id and self.type_id.company_id and \
                self.type_id.company_id != self.company_id:
            self._cache.update(
                self._convert_to_cache({'type_id': False}, update=True))

    @api.multi
    @api.constrains('company_id', 'type_id')
    def _check_company_id_type_id(self):
        for rec in self.sudo():
            if rec.company_id and rec.type_id.company_id and\
                    rec.company_id != rec.type_id.company_id:
                raise ValidationError(
                    _('The Company in the Date Range and in '
                      'Date Range Type must be the same.'))

    @api.constrains('type_id', 'date_start', 'date_end', 'company_id')
    def _validate_range(self):
        for this in self:
            if this.date_start > this.date_end:
                raise ValidationError(
                    _("%s is not a valid range (%s > %s)") % (
                        this.name, this.date_start, this.date_end))
            if this.type_id.allow_overlap:
                continue
            # here we use a plain SQL query to benefit of the daterange
            # function available in PostgresSQL
            # (http://www.postgresql.org/docs/current/static/rangetypes.html)
            SQL = """
                SELECT
                    id
                FROM
                    date_range dt
                WHERE
                    DATERANGE(dt.date_start, dt.date_end, '[]') &&
                        DATERANGE(%s::date, %s::date, '[]')
                    AND dt.id != %s
                    AND dt.active
                    AND dt.company_id = %s
                    AND dt.type_id=%s;"""
            self.env.cr.execute(SQL, (this.date_start,
                                      this.date_end,
                                      this.id,
                                      this.company_id.id or None,
                                      this.type_id.id))
            res = self.env.cr.fetchall()
            if res:
                dt = self.browse(res[0][0])
                raise ValidationError(
                    _("%s overlaps %s") % (this.name, dt.name))

    @api.multi
    def get_domain(self, field_name):
        self.ensure_one()
        return [(field_name, '>=', self.date_start),
                (field_name, '<=', self.date_end)]