# Copyright 2012 - Now Savoir-faire Linux <https://www.savoirfairelinux.com/>
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

import re

from flectra import api, fields, models
from flectra.tools.safe_eval import safe_eval


def is_one_value(result):
    # check if sql query returns only one value
    if isinstance(result, dict) and "value" in result.dictfetchone():
        return True
    elif isinstance(result, list) and "value" in result[0]:
        return True
    else:
        return False


RE_SELECT_QUERY = re.compile(
    ".*("
    + "|".join(
        (
            "INSERT",
            "UPDATE",
            "DELETE",
            "CREATE",
            "ALTER",
            "DROP",
            "GRANT",
            "REVOKE",
            "INDEX",
        )
    )
    + ")"
)


def is_sql_or_ddl_statement(query):
    """Check if sql query is a SELECT statement"""
    return not RE_SELECT_QUERY.match(query.upper())


class KPIThresholdRange(models.Model):
    """
    KPI Threshold Range
    """

    _name = "kpi.threshold.range"
    _description = "KPI Threshold Range"

    @api.model
    def _selection_value_type(self):
        return [
            ("static", "Fixed value"),
            ("python", "Python Code"),
            ("local", "SQL - Local DB"),
            ("external", "SQL - External DB"),
        ]

    name = fields.Char(required=True)
    valid = fields.Boolean(
        required=True, compute="_compute_is_valid_range", default=True
    )
    invalid_message = fields.Char(
        string="Message", size=100, compute="_compute_is_valid_range"
    )
    min_type = fields.Selection(selection="_selection_value_type", required=True)
    min_value = fields.Float(string="Minimum Value", compute="_compute_min_value")
    min_fixed_value = fields.Float("Minimum Fixed Value")
    min_code = fields.Text("Minimum Computation Code")
    min_error = fields.Char("Minimum Error", compute="_compute_min_value")
    min_dbsource_id = fields.Many2one(
        "base.external.dbsource",
        "External DB Source Minimum",
    )
    max_type = fields.Selection(selection="_selection_value_type", required=True)
    max_value = fields.Float(string="Maximum Value", compute="_compute_max_value")
    max_fixed_value = fields.Float("Maximum Fixed Value")
    max_code = fields.Text("Maximum Computation Code")
    max_error = fields.Char("Maximum Error", compute="_compute_max_value")
    max_dbsource_id = fields.Many2one(
        "base.external.dbsource",
        "External DB Source Maximum",
    )

    color = fields.Char(help="Choose your color")

    threshold_ids = fields.Many2many(
        "kpi.threshold",
        "kpi_threshold_range_rel",
        "range_id",
        "threshold_id",
        "Thresholds",
    )
    company_id = fields.Many2one(
        "res.company", "Company", default=lambda self: self.env.company
    )

    def _compute_min_value(self):
        for obj in self:
            value = None
            error = None
            try:
                if obj.min_type == "local" and is_sql_or_ddl_statement(obj.min_code):
                    self.env.cr.execute(obj.min_code)
                    dic = self.env.cr.dictfetchall()
                    if is_one_value(dic):
                        value = dic[0]["value"]
                elif (
                    obj.min_type == "external"
                    and obj.min_dbsource_id.id
                    and is_sql_or_ddl_statement(obj.min_code)
                ):
                    dbsrc_obj = obj.min_dbsource_id
                    res = dbsrc_obj.execute(obj.min_code)
                    if is_one_value(res):
                        value = res[0]["value"]
                elif obj.min_type == "python":
                    value = safe_eval(obj.min_code)
                else:
                    value = obj.min_fixed_value
            except Exception as e:
                value = None
                error = str(e)
            obj.min_value = value
            obj.min_error = error

    def _compute_max_value(self):
        for obj in self:
            value = None
            error = None
            try:
                if obj.max_type == "local" and is_sql_or_ddl_statement(obj.max_code):
                    self.env.cr.execute(obj.max_code)
                    dic = self.env.cr.dictfetchall()
                    if is_one_value(dic):
                        value = dic[0]["value"]
                elif (
                    obj.max_type == "external"
                    and obj.max_dbsource_id.id
                    and is_sql_or_ddl_statement(obj.max_code)
                ):
                    dbsrc_obj = obj.max_dbsource_id
                    res = dbsrc_obj.execute(obj.max_code)
                    if is_one_value(res):
                        value = res[0]["value"]
                elif obj.max_type == "python":
                    value = safe_eval(obj.max_code)
                else:
                    value = obj.max_fixed_value
            except Exception as e:
                value = None
                error = str(e)
            obj.max_value = value
            obj.max_error = error

    def _compute_is_valid_range(self):
        for obj in self:
            if obj.min_error or obj.max_error:
                obj.valid = False
                obj.invalid_message = (
                    "Either minimum or maximum value has "
                    "computation errors. Please fix them."
                )
            elif obj.max_value < obj.min_value:
                obj.valid = False
                obj.invalid_message = (
                    "Minimum value is greater than the maximum "
                    "value! Please adjust them."
                )
            else:
                obj.valid = True
                obj.invalid_message = ""