# Copyright (C) 2017 - Today: GRAP (http://www.grap.coop)
# @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

import re

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


class BiSQLViewField(models.Model):
    _name = "bi.sql.view.field"
    _description = "Bi SQL View Field"
    _order = "sequence"

    _TTYPE_SELECTION = [
        ("boolean", "boolean"),
        ("char", "char"),
        ("date", "date"),
        ("datetime", "datetime"),
        ("float", "float"),
        ("integer", "integer"),
        ("many2one", "many2one"),
        ("selection", "selection"),
    ]

    _GRAPH_TYPE_SELECTION = [
        ("col", "Column"),
        ("row", "Row"),
        ("measure", "Measure"),
    ]

    _TREE_VISIBILITY_SELECTION = [
        ("unavailable", "Unavailable"),
        ("hidden", "Hidden"),
        ("available", "Available"),
    ]

    # Mapping to guess Odoo field type, from SQL column type
    _SQL_MAPPING = {
        "boolean": "boolean",
        "bigint": "integer",
        "integer": "integer",
        "double precision": "float",
        "numeric": "float",
        "text": "char",
        "character varying": "char",
        "date": "date",
        "timestamp without time zone": "datetime",
    }

    _GROUP_OPERATOR_SELECTION = [
        ("sum", "Sum"),
        ("avg", "Average"),
        ("min", "Minimum"),
        ("max", "Maximum"),
    ]

    name = fields.Char(string="Name", required=True, readonly=True)

    sql_type = fields.Char(
        string="SQL Type", required=True, readonly=True, help="SQL Type in the database"
    )

    sequence = fields.Integer(string="sequence", required=True, readonly=True)

    bi_sql_view_id = fields.Many2one(
        string="SQL View", comodel_name="bi.sql.view", ondelete="cascade"
    )

    is_index = fields.Boolean(
        string="Is Index",
        help="Check this box if you want to create"
        " an index on that field. This is recommended for searchable and"
        " groupable fields, to reduce duration",
    )

    is_group_by = fields.Boolean(
        string="Is Group by",
        help="Check this box if you want to create"
        " a 'group by' option in the search view",
    )

    index_name = fields.Char(string="Index Name", compute="_compute_index_name")

    graph_type = fields.Selection(string="Graph Type", selection=_GRAPH_TYPE_SELECTION)

    tree_visibility = fields.Selection(
        string="Tree Visibility",
        selection=_TREE_VISIBILITY_SELECTION,
        default="available",
        required=True,
    )

    field_description = fields.Char(
        string="Field Description",
        help="This will be used as the name" " of the Odoo field, displayed for users",
    )

    ttype = fields.Selection(
        string="Field Type",
        selection=_TTYPE_SELECTION,
        help="Type of the"
        " Odoo field that will be created. Keep empty if you don't want to"
        " create a new field. If empty, this field will not be displayed"
        " neither available for search or group by function",
    )

    selection = fields.Text(
        string="Selection Options",
        default="[]",
        help="For 'Selection' Odoo field.\n"
        " List of options, specified as a Python expression defining a list of"
        " (key, label) pairs. For example:"
        " [('blue','Blue'), ('yellow','Yellow')]",
    )

    many2one_model_id = fields.Many2one(
        comodel_name="ir.model",
        string="Model",
        help="For 'Many2one' Odoo field.\n" " Comodel of the field.",
    )

    group_operator = fields.Selection(
        string="Group Operator",
        selection=_GROUP_OPERATOR_SELECTION,
        help="By default, Odoo will sum the values when grouping. If you wish "
        "to alter the behaviour, choose an alternate Group Operator",
    )

    # Constrains Section
    @api.constrains("is_index")
    def _check_index_materialized(self):
        for rec in self.filtered(lambda x: x.is_index):
            if not rec.bi_sql_view_id.is_materialized:
                raise UserError(
                    _("You can not create indexes on non materialized views")
                )

    # Compute Section
    def _compute_index_name(self):
        for sql_field in self:
            sql_field.index_name = "{}_{}".format(
                sql_field.bi_sql_view_id.view_name,
                sql_field.name,
            )

    # Overload Section
    @api.model
    def create(self, vals):
        field_without_prefix = vals["name"][2:]
        # guess field description
        field_description = re.sub(
            r"\w+",
            lambda m: m.group(0).capitalize(),
            field_without_prefix.replace("_id", "").replace("_", " "),
        )

        # Guess ttype
        # Don't execute as simple .get() in the dict to manage
        # correctly the type 'character varying(x)'
        ttype = False
        for k, v in self._SQL_MAPPING.items():
            if k in vals["sql_type"]:
                ttype = v

        # Guess many2one_model_id
        many2one_model_id = False
        if vals["sql_type"] == "integer" and (vals["name"][-3:] == "_id"):
            ttype = "many2one"
            model_name = self._model_mapping().get(field_without_prefix, "")
            many2one_model_id = (
                self.env["ir.model"].search([("model", "=", model_name)]).id
            )

        vals.update(
            {
                "ttype": ttype,
                "field_description": field_description,
                "many2one_model_id": many2one_model_id,
            }
        )
        return super(BiSQLViewField, self).create(vals)

    # Custom Section
    @api.model
    def _model_mapping(self):
        """Return dict of key value, to try to guess the model based on a
        field name. Sample :
        {'account_id': 'account.account'; 'product_id': 'product.product'}
        """
        relation_fields = self.env["ir.model.fields"].search(
            [("ttype", "=", "many2one")]
        )
        res = {}
        keys_to_pop = []
        for field in relation_fields:
            if field.name in res and res.get(field.name) != field.relation:
                # The field name is not predictive
                keys_to_pop.append(field.name)
            else:
                res.update({field.name: field.relation})

        for key in list(set(keys_to_pop)):
            res.pop(key)

        return res

    def _prepare_model_field(self):
        self.ensure_one()
        return {
            "name": self.name,
            "field_description": self.field_description,
            "model_id": self.bi_sql_view_id.model_id.id,
            "ttype": self.ttype,
            "selection": self.ttype == "selection" and self.selection or False,
            "relation": self.ttype == "many2one"
            and self.many2one_model_id.model
            or False,
        }

    def _prepare_tree_field(self):
        self.ensure_one()
        res = ""
        if self.field_description and self.tree_visibility != "unavailable":
            res = """<field name="{}" {}/>""".format(
                self.name, self.tree_visibility == "hidden" and 'invisible="1"' or ""
            )
        return res

    def _prepare_graph_field(self):
        self.ensure_one()
        res = ""
        if self.graph_type and self.field_description:
            res = """<field name="{}" type="{}" />\n""".format(
                self.name, self.graph_type
            )
        return res

    def _prepare_pivot_field(self):
        self.ensure_one()
        res = ""
        if self.field_description:
            graph_type_text = self.graph_type and 'type="%s"' % (self.graph_type) or ""
            res = """<field name="{}" {} />\n""".format(self.name, graph_type_text)
        return res

    def _prepare_search_field(self):
        self.ensure_one()
        res = ""
        if self.field_description:
            res = """<field name="{}"/>\n""".format(self.name)
        return res

    def _prepare_search_filter_field(self):
        self.ensure_one()
        res = ""
        if self.field_description and self.is_group_by:
            res = """<filter name="group_by_%s" string="%s"
                        context="{'group_by':'%s'}"/>\n""" % (
                self.name,
                self.field_description,
                self.name,
            )
        return res