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

import ast
import json
import re
from datetime import date, datetime, time

from dateutil import relativedelta

from odoo import _, api, fields, models
from odoo.exceptions import ValidationError
from odoo.tools.float_utils import float_compare
from odoo.tools.safe_eval import safe_eval

from odoo.addons.base.models.ir_cron import _intervalTypes


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"), ("code", "Code")],
        required=True,
        default="code",
    )
    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(
        [
            ("integer", "Integer"),
            ("number", "Number"),
            ("meter", "Meter"),
            ("counter", "Counter"),
            ("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",
    )
    code = fields.Text("Code")
    store_history = fields.Boolean()
    store_history_interval = fields.Selection(
        selection=lambda self: self.env["ir.cron"]._fields["interval_type"].selection,
    )
    store_history_interval_number = fields.Integer()
    compute_on_fly = fields.Boolean()
    history_ids = fields.One2many("kpi.kpi.history", inverse_name="kpi_id")
    computed_value = fields.Serialized(compute="_compute_computed_value")
    computed_date = fields.Datetime(compute="_compute_computed_value")

    @api.depends("value", "value_last_update", "compute_on_fly")
    def _compute_computed_value(self):
        for record in self:
            if record.compute_on_fly:
                record.computed_value = record._compute_value()
                record.computed_date = fields.Datetime.now()
            else:
                record.computed_value = record.value
                record.computed_date = record.value_last_update

    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 _generate_history_vals(self, value):
        return {
            "kpi_id": self.id,
            "value": value,
            "widget": self.widget,
        }

    def _compute_value(self):
        return getattr(self, "_compute_value_%s" % self.computation_method)()

    def _compute(self):
        value = self._compute_value()
        self.write({"value": value})
        if self.store_history:
            last = self.env["kpi.kpi.history"].search(
                [("kpi_id", "=", self.id)], limit=1
            )
            if (
                not last
                or not self.store_history_interval
                or last.create_date
                + _intervalTypes[self.store_history_interval](
                    self.store_history_interval_number
                )
                < fields.Datetime.now()
            ):
                self.env["kpi.kpi.history"].create(self._generate_history_vals(value))
        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())

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

    def _get_code_input_dict(self):
        return {
            "self": self,
            "model": self.browse(),
            "datetime": datetime,
            "date": date,
            "time": time,
            "float_compare": float_compare,
            "relativedelta": relativedelta.relativedelta,
        }

    def _forbidden_code(self):
        return ["commit", "rollback", "getattr", "execute"]

    def _compute_value_code(self):
        forbidden = self._forbidden_code()
        search_terms = "(" + ("|".join(forbidden)) + ")"
        if re.search(search_terms, (self.code or "").lower()):
            message = ", ".join(forbidden[:-1]) or ""
            if len(message) > 0:
                message += _(" or ")
            message += forbidden[-1]
            raise ValidationError(
                _("The code cannot contain the following terms: %s.") % message
            )
        results = self._get_code_input_dict()
        savepoint = "kpi_formula_%s" % self.id
        # pylint: disable=E8103
        self.env.cr.execute("savepoint %s" % savepoint)
        safe_eval(self.code or "", results, mode="exec", nocopy=True)
        # pylint: disable=E8103
        self.env.cr.execute("rollback to %s" % savepoint)
        return results.get("result", {})

    def show_value(self):
        self.ensure_one()
        action = self.env.ref("kpi_dashboard.kpi_kpi_act_window")
        result = action.read()[0]
        result.update(
            {
                "res_id": self.id,
                "target": "new",
                "view_mode": "form",
                "views": [
                    (self.env.ref("kpi_dashboard.kpi_kpi_widget_form_view").id, "form")
                ],
            }
        )
        return result


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,
    )
    context = fields.Char()

    def read_dashboard(self):
        result = {}
        for r in self:
            result[r.id] = {
                "id": r.action.id,
                "type": r.action._name,
                "name": r.action.name,
                "context": safe_eval(r.context or "{}"),
            }
        return result


class KpiKpiHistory(models.Model):
    _name = "kpi.kpi.history"
    _description = "KPI history"
    _order = "create_date DESC"

    kpi_id = fields.Many2one(
        "kpi.kpi", required=True, ondelete="cascade", readonly=True
    )
    value = fields.Serialized(readonly=True)
    raw_value = fields.Char(compute="_compute_raw_value")
    name = fields.Char(related="kpi_id.name")
    widget = fields.Selection(
        selection=lambda self: self.env["kpi.kpi"]._fields["widget"].selection,
        required=True,
        default="number",
    )

    @api.depends("value")
    def _compute_raw_value(self):
        for record in self:
            record.raw_value = json.dumps(record.value)

    def show_form(self):
        self.ensure_one()
        action = self.env.ref("kpi_dashboard.kpi_kpi_history_act_window")
        result = action.read()[0]
        result.update(
            {
                "res_id": self.id,
                "target": "new",
                "view_mode": "form",
                "views": [(self.env.context.get("form_id"), "form")],
            }
        )
        return result