# Copyright 2019 Therp BV <https://therp.nl>
# Copyright 2019-2020 initOS GmbH <https://initos.com>
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

import datetime

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

import dateutil
import vobject
from dateutil import tz


class DavCollectionFieldMapping(models.Model):
    _name = "dav.collection.field_mapping"
    _description = "A field mapping for a WebDAV collection"

    collection_id = fields.Many2one(
        "dav.collection",
        required=True,
        ondelete="cascade",
    )
    name = fields.Char(
        required=True,
        help="Attribute name in the vobject",
    )
    mapping_type = fields.Selection(
        [
            ("simple", "Simple"),
            ("code", "Code"),
        ],
        default="simple",
        required=True,
    )
    field_id = fields.Many2one(
        "ir.model.fields",
        required=True,
        ondelete="cascade",
        help="Field of the model the values are mapped to",
    )
    model_id = fields.Many2one(
        "ir.model",
        related="collection_id.model_id",
    )
    import_code = fields.Text(
        help="Code to import the value from a vobject. Use the variable "
        "result for the output of the value and item as input"
    )
    export_code = fields.Text(
        help="Code to export the value to a vobject. Use the variable "
        "result for the output of the value and record as input"
    )

    def from_vobject(self, child):
        self.ensure_one()
        if self.mapping_type == "code":
            return self._from_vobject_code(child)
        return self._from_vobject_simple(child)

    def _from_vobject_code(self, child):
        self.ensure_one()
        context = {
            "datetime": datetime,
            "dateutil": dateutil,
            "item": child,
            "result": None,
            "tools": tools,
            "tz": tz,
            "vobject": vobject,
        }
        safe_eval(self.import_code, context, mode="exec", nocopy=True)
        return context.get("result", {})

    def _from_vobject_simple(self, child):
        self.ensure_one()
        name = self.name.lower()
        conversion_funcs = [
            "_from_vobject_%s_%s" % (self.field_id.ttype, name),
            "_from_vobject_%s" % self.field_id.ttype,
        ]

        for conversion_func in conversion_funcs:
            if hasattr(self, conversion_func):
                value = getattr(self, conversion_func)(child)
                if value:
                    return value

        return child.value

    @api.model
    def _from_vobject_datetime(self, item):
        if isinstance(item.value, datetime.datetime):
            value = item.value.astimezone(dateutil.tz.UTC)
            return value.strftime(tools.DEFAULT_SERVER_DATETIME_FORMAT)
        elif isinstance(item.value, datetime.date):
            return item.value.strftime(tools.DEFAULT_SERVER_DATETIME_FORMAT)
        return None

    @api.model
    def _from_vobject_date(self, item):
        if isinstance(item.value, datetime.datetime):
            value = item.value.astimezone(dateutil.tz.UTC)
            return value.strftime(tools.DEFAULT_SERVER_DATE_FORMAT)
        elif isinstance(item.value, datetime.date):
            return item.value.strftime(tools.DEFAULT_SERVER_DATE_FORMAT)
        return None

    @api.model
    def _from_vobject_binary(self, item):
        return item.value.encode("ascii")

    @api.model
    def _from_vobject_char_n(self, item):
        return item.family

    def to_vobject(self, record):
        self.ensure_one()
        if self.mapping_type == "code":
            result = self._to_vobject_code(record)
        else:
            result = self._to_vobject_simple(record)

        if isinstance(result, datetime.datetime) and not result.tzinfo:
            return result.replace(tzinfo=tz.UTC)
        return result

    def _to_vobject_code(self, record):
        self.ensure_one()
        context = {
            "datetime": datetime,
            "dateutil": dateutil,
            "record": record,
            "result": None,
            "tools": tools,
            "tz": tz,
            "vobject": vobject,
        }
        safe_eval(self.export_code, context, mode="exec", nocopy=True)
        return context.get("result", None)

    def _to_vobject_simple(self, record):
        self.ensure_one()
        conversion_funcs = [
            "_to_vobject_%s_%s" % (self.field_id.ttype, self.name.lower()),
            "_to_vobject_%s" % self.field_id.ttype,
        ]
        value = record[self.field_id.name]
        for conversion_func in conversion_funcs:
            if hasattr(self, conversion_func):
                return getattr(self, conversion_func)(value)
        return value

    @api.model
    def _to_vobject_datetime(self, value):
        result = fields.Datetime.from_string(value)
        return result.replace(tzinfo=tz.UTC)

    @api.model
    def _to_vobject_datetime_rev(self, value):
        return value and value.replace("-", "").replace(" ", "T").replace(":", "") + "Z"

    @api.model
    def _to_vobject_date(self, value):
        return fields.Date.from_string(value)

    @api.model
    def _to_vobject_binary(self, value):
        return value and value.decode("ascii")

    @api.model
    def _to_vobject_char_n(self, value):
        # TODO: how are we going to handle compound types like this?
        return vobject.vcard.Name(family=value)