# Copyright 2020 Creu Blanca
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

from odoo import api, fields, models
import ast


class KpiKpi(models.Model):
    _name = "kpi.kpi"
    _description = "Kpi Kpi"

    name = fields.Char(required=True)
    active = fields.Boolean(default=True)
    cron_id = fields.Many2one("ir.cron", readonly=True, copy=False)
    computation_method = fields.Selection(
        [("function", "Function")], required=True
    )
    value = fields.Serialized()
    dashboard_item_ids = fields.One2many("kpi.dashboard.item", inverse_name="kpi_id")
    model_id = fields.Many2one("ir.model",)
    function = fields.Char()
    args = fields.Char()
    kwargs = fields.Char()
    widget = fields.Selection(
        [("number", "Number"), ("meter", "Meter"), ("graph", "Graph")],
        required=True,
        default="number",
    )
    value_last_update = fields.Datetime(readonly=True)
    prefix = fields.Char()
    suffix = fields.Char()
    action_ids = fields.One2many(
        "kpi.kpi.action",
        inverse_name='kpi_id',
        help="Actions that can be opened from the KPI"
    )

    def _cron_vals(self):
        return {
            "name": self.name,
            "model_id": self.env.ref("kpi_dashboard.model_kpi_kpi").id,
            "interval_number": 1,
            "interval_type": "hours",
            "state": "code",
            "code": "model.browse(%s).compute()" % self.id,
            "active": True,
        }

    def compute(self):
        for record in self:
            record._compute()
        return True

    def _compute(self):
        self.write(
            {
                "value": getattr(
                    self, "_compute_value_%s" % self.computation_method
                )()
            }
        )
        notifications = []
        for dashboard_item in self.dashboard_item_ids:
            channel = "kpi_dashboard_%s" % dashboard_item.dashboard_id.id
            notifications.append([channel, dashboard_item._read_dashboard()])
        if notifications:
            self.env["bus.bus"].sendmany(notifications)

    def _compute_value_function(self):
        obj = self
        if self.model_id:
            obj = self.env[self.model_id.model]
        args = ast.literal_eval(self.args or "[]")
        kwargs = ast.literal_eval(self.kwargs or "{}")
        return getattr(obj, self.function)(*args, **kwargs)

    def generate_cron(self):
        self.ensure_one()
        self.cron_id = self.env["ir.cron"].create(self._cron_vals())

    @api.multi
    def write(self, vals):
        if "value" in vals:
            vals["value_last_update"] = fields.Datetime.now()
        return super().write(vals)


class KpiKpiAction(models.Model):
    _name = 'kpi.kpi.action'
    _description = 'KPI action'

    kpi_id = fields.Many2one('kpi.kpi', required=True, ondelete='cascade')
    action = fields.Reference(
        selection=[('ir.actions.report', 'ir.actions.report'),
                   ('ir.actions.act_window', 'ir.actions.act_window'),
                   ('ir.actions.act_url', 'ir.actions.act_url'),
                   ('ir.actions.server', 'ir.actions.server'),
                   ('ir.actions.client', 'ir.actions.client')],
        required=True,
    )

    def read_dashboard(self):
        result = []
        for r in self:
            result.append({
                'id': r.action.id,
                'type': r.action._name,
                'name': r.action.name
            })
        return result