# Author: Guewen Baconnier
# Copyright 2012-2017 Camptocamp SA
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).

import logging
from itertools import groupby

from cStringIO import StringIO
from oauthlib.oauth2.rfc6749.errors import OAuth2Error

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

from .pingen import APIError, pingen_datetime_to_utc

_logger = logging.getLogger(__name__)


class PingenDocument(models.Model):
    """A pingen document is the state of the synchronization of
    an attachment with pingen.com

    It stores the configuration and the current state of the synchronization.
    It also serves as a queue of documents to push to pingen.com
    """

    _name = "pingen.document"
    _inherits = {"ir.attachment": "attachment_id"}
    _order = "push_date desc, id desc"

    attachment_id = fields.Many2one(
        "ir.attachment", "Document", required=True, readonly=True, ondelete="cascade"
    )
    state = fields.Selection(
        [
            ("pending", "Pending"),
            ("pushed", "Pushed"),
            ("sendcenter", "In Sendcenter"),
            ("sent", "Sent"),
            ("error_undeliverable", "Undeliverable"),
            ("error", "Connection Error"),
            ("pingen_error", "Pingen Error"),
            ("canceled", "Canceled"),
        ],
        string="State",
        readonly=True,
        required=True,
        default="pending",
    )
    auto_send = fields.Boolean(
        "Auto Send",
        help="Defines if a document is merely uploaded or also sent",
        default=True,
    )
    delivery_product = fields.Selection(
        [
            ("fast", "fast"),
            ("cheap", "cheap"),
            ("bulk", "bulk"),
            ("track", "track"),
            ("sign", "sign"),
            ("atpost_economy", "atpost_economy"),
            ("atpost_priority", "atpost_priority"),
            ("postag_a", "postag_a"),
            ("postag_b", "postag_b"),
            ("postag_b2", "postag_b2"),
            ("postag_registered", "postag_registered"),
            ("postag_aplus", "postag_aplus"),
            ("dpag_standard", "dpag_standard"),
            ("dpag_economy", "dpag_economy"),
            ("indpost_mail", "indpost_mail"),
            ("indpost_speedmail", "indpost_speedmail"),
            ("nlpost_priority", "nlpost_priority"),
            ("dhl_priority", "dhl_priority"),
        ],
        "Delivery product",
        default="cheap",
    )
    print_spectrum = fields.Selection(
        [("grayscale", "Grayscale"), ("color", "Color")],
        "Print Spectrum",
        default="grayscale",
    )
    print_mode = fields.Selection(
        [("simplex", "Simplex"), ("duplex", "Duplex")], "Print mode", default="simplex"
    )

    push_date = fields.Datetime("Push Date", readonly=True)
    # for `error` and `pingen_error` states when we push
    last_error_message = fields.Text("Error Message", readonly=True)
    # pingen API v2 fields
    pingen_uuid = fields.Char(readonly=True)
    pingen_status = fields.Char(readonly=True)
    # sendcenter infos
    parsed_address = fields.Text("Parsed Address", readonly=True)
    cost = fields.Float("Cost", readonly=True)
    currency_id = fields.Many2one("res.currency", "Currency", readonly=True)
    country_id = fields.Many2one("res.country", "Country", readonly=True)
    send_date = fields.Datetime("Date of sending", readonly=True)
    pages = fields.Integer("Pages", readonly=True)
    company_id = fields.Many2one(related="attachment_id.company_id")

    _sql_constraints = [
        (
            "pingen_document_attachment_uniq",
            "unique (attachment_id)",
            "Only one Pingen document is allowed per attachment.",
        ),
    ]

    def _push_to_pingen(self, pingen=None):
        """Push a document to pingen.com
        :param Pingen pingen: optional pingen object to reuse session
        """
        decoded_document = self.attachment_id._decoded_content()
        if pingen is None:
            pingen = self.company_id._get_pingen_client()
        try:
            doc_id, post_id, infos = pingen.push_document(
                self.name,
                StringIO(decoded_document),
                self.attachment_id.mimetype,
                self.auto_send,
                self.delivery_product,
                self.print_spectrum,
                self.print_mode,
            )
        except OAuth2Error as e:
            _logger.exception(
                "Connection Error when pushing Pingen Document with ID %s to %s: %s"
                % (self.id, pingen.api_url, e.description)
            )
            raise
        except APIError:
            _logger.error(
                "API Error when pushing Pingen Document %s to %s."
                % (self.id, pingen.api_url)
            )
            raise
        error = False
        state = "pushed"
        # if post_id:
        #     state = 'sendcenter'
        # elif infos['requirement_failure']:
        #     state = 'pingen_error'
        #     error = _('The document does not meet the Pingen requirements.')
        push_date = pingen_datetime_to_utc(infos.get("created_at"))
        self.write(
            {
                "last_error_message": error,
                "state": state,
                "push_date": fields.Datetime.to_string(push_date),
                "pingen_uuid": doc_id,
                "pingen_status": infos.get("status"),
            }
        )
        _logger.info("Pingen Document %s: pushed to %s" % (self.id, pingen.api_url))

    def push_to_pingen(self):
        """Push a document to pingen.com
        Convert errors to osv.except_osv to be handled by the client.
        Wrapper method for multiple ids (when triggered from button for
        instance) for public interface.
        """
        self.ensure_one()
        state = False
        error_msg = False
        try:
            session = self.company_id._get_pingen_client()
            self._push_to_pingen(pingen=session)
        except OAuth2Error:
            state = "error"
            error_msg = (
                _("Connection Error when pushing document %s to Pingen") % self.name
            )
        except APIError as e:
            state = "pingen_error"
            error_msg = _("Error when pushing the document %s to Pingen:\n%s") % (
                self.name,
                e,
            )
        except Exception as e:
            error_msg = _(
                "Unexpected Error when pushing the document %s to Pingen:\n%s"
            ) % (self.name, e)
            _logger.exception(error_msg)
        finally:
            if error_msg:
                vals = {"last_error_message": error_msg}
                if state:
                    vals.update({"state": state})
                with odoo.registry(self.env.cr.dbname).cursor() as new_cr:
                    new_env = odoo.api.Environment(
                        new_cr, self.env.uid, self.env.context
                    )
                    self.with_env(new_env).write(vals)

                raise UserError(error_msg)
        return True

    def _push_and_send_to_pingen_cron(self):
        """Push a document to pingen.com
        Intended to be used in a cron.
        Commit after each record
        Instead of raising, store the error in the pingen.document
        """
        with odoo.api.Environment.manage():
            with odoo.registry(self.env.cr.dbname).cursor() as new_cr:
                new_env = odoo.api.Environment(new_cr, self.env.uid, self.env.context)
                # Instead of raising, store the error in the pingen.document
                self = self.with_env(new_env)
                not_sent_docs = self.search(
                    [("state", "!=", "sent")], order="company_id"
                )
                for company, documents in groupby(
                    not_sent_docs, lambda d: d.company_id
                ):
                    session = company._get_pingen_client()
                    for document in documents:
                        if document.state == "error":
                            document._resolve_error()
                            document.refresh()
                        try:
                            if document.state == "pending":
                                document._push_to_pingen(pingen=session)
                            elif document.state == "pushed" and not document.auto_send:
                                document._ask_pingen_send(pingen=session)
                        except OAuth2Error as e:
                            document.write({"last_error_message": e, "state": "error"})
                        except APIError as e:
                            document.write(
                                {"last_error_message": e, "state": "pingen_error"}
                            )
                        except BaseException:
                            _logger.error("Unexpected error in pingen cron")
        return True

    def _resolve_error(self):
        """A document as resolved, put in the correct state"""
        if self.send_date:
            state = "sent"
        elif self.pingen_uuid:
            state = "pushed"
        else:
            state = "pending"
        self.write({"state": state})

    def resolve_error(self):
        """A document as resolved, put in the correct state"""
        for document in self:
            document._resolve_error()
        return True

    def _ask_pingen_send(self, pingen):
        """For a document already pushed to pingen, ask to send it.
        :param Pingen pingen: pingen object to reuse
        """
        try:
            infos = pingen.send_document(
                self.pingen_uuid,
                self.delivery_product,
                self.print_spectrum,
                self.print_mode,
            )
        except OAuth2Error:
            _logger.exception(
                "Connection Error when asking for sending Pingen Document %s "
                "to %s." % (self.id, pingen.api_url)
            )
            raise
        except APIError:
            _logger.exception(
                "API Error when asking for sending Pingen Document %s to %s."
                % (self.id, pingen.api_url)
            )
            raise
        self.write(
            {
                "last_error_message": False,
                "state": "sendcenter",
                "pingen_status": infos.get("status"),
            }
        )
        _logger.info(
            "Pingen Document %s: asked for sending to %s" % (self.id, pingen.api_url)
        )
        return True

    def ask_pingen_send(self):
        """For a document already pushed to pingen, ask to send it.
        Wrapper method for multiple ids (when triggered from button for
        instance) for public interface.
        """
        self.ensure_one()
        try:
            session = self.company_id._get_pingen_client()
            self._ask_pingen_send(pingen=session)
        except OAuth2Error:
            raise UserError(
                _(
                    "Connection Error when asking for "
                    "sending the document %s to Pingen"
                )
                % self.name
            )

        except APIError as e:
            raise UserError(
                _("Error when asking Pingen to send the document %s: " "\n%s")
                % (self.name, e)
            )

        except BaseException:
            _logger.exception(
                "Unexpected Error when updating the status "
                "of pingen.document %s: " % self.id
            )
            raise UserError(
                _("Unexpected Error when updating the status " "of Document %s")
                % self.name
            )
        return True

    def _get_and_update_post_infos(self, pingen):
        """Update the informations from
        pingen of a document in the Sendcenter
        :param Pingen pingen: pingen object to reuse
        """
        post_infos = self._get_post_infos(pingen)
        self._update_post_infos(post_infos)

    def _get_post_infos(self, pingen):
        if not self.pingen_uuid:
            return
        try:
            post_infos = pingen.post_infos(self.pingen_uuid)
        except OAuth2Error:
            _logger.exception(
                "Connection Error when asking for "
                "sending Pingen Document %s to %s." % (self.id, pingen.api_url)
            )
            raise
        except APIError:
            _logger.exception(
                "API Error when asking for sending Pingen Document %s to %s."
                % (self.id, pingen.api_url)
            )
            raise
        return post_infos

    @api.model
    def _prepare_values_from_post_infos(self, post_infos):
        country = self.env["res.country"].search(
            [("code", "=", post_infos.get("country"))]
        )
        currency = self.env["res.currency"].search(
            [("name", "=", post_infos.get("price_currency"))]
        )
        vals = {
            "pingen_status": post_infos.get("status"),
            "parsed_address": post_infos.get("address"),
            "country_id": country.id,
            "pages": post_infos.get("file_pages"),
            "last_error_message": False,
            "cost": post_infos.get("price_value"),
            "currency_id": currency.id,
        }
        is_posted = post_infos.get("status") == "sent"
        if is_posted:
            post_date = post_infos.get("submitted_at")
            send_date = fields.Datetime.to_string(pingen_datetime_to_utc(post_date))
            vals["state"] = "sent"
        else:
            send_date = False
        vals["send_date"] = send_date
        return vals

    def _update_post_infos(self, post_infos):
        self.ensure_one()
        values = self._prepare_values_from_post_infos(post_infos)
        self.write(values)
        _logger.info("Pingen Document %s: status updated" % self.id)

    def _update_post_infos_cron(self):
        """Update the informations from pingen of a
        document in the Sendcenter
        Intended to be used in a cron.
        Commit after each record
        Do not raise errors, only skip the update of the record."""
        with odoo.api.Environment.manage():
            with odoo.registry(self.env.cr.dbname).cursor() as new_cr:
                new_env = odoo.api.Environment(new_cr, self.env.uid, self.env.context)
                # Instead of raising, store the error in the pingen.document
                self = self.with_env(new_env)
                pushed_docs = self.search([("state", "!=", "sent")])
                for document in pushed_docs:
                    session = document.company_id._get_pingen_client()
                    try:
                        document._get_and_update_post_infos(pingen=session)
                    except (OAuth2Error, APIError):
                        # will be retried the next time
                        # In any case, the error has been
                        # logged by _update_post_infos
                        pass
                    except BaseException as e:
                        _logger.error("Unexcepted error in pingen cron: %", e)
                        raise
        return True

    def update_post_infos(self):
        """Update the informations from pingen of a document in the Sendcenter
        Wrapper method for multiple ids (when triggered from button for
        instance) for public interface.
        """
        self.ensure_one()
        try:
            session = self.company_id._get_pingen_client()
            self._get_and_update_post_infos(pingen=session)
        except OAuth2Error:
            raise UserError(
                _(
                    "Connection Error when updating the status "
                    "of Document %s from Pingen"
                )
                % self.name
            )
        except APIError as e:
            raise UserError(
                _("Error when updating the status of Document %s from " "Pingen: \n%s")
                % (self.name, e)
            )
        except BaseException:
            _logger.exception(
                "Unexpected Error when updating the status "
                "of pingen.document %s: " % self.id
            )
            raise UserError(
                _("Unexpected Error when updating the status " "of Document %s")
                % self.name
            )
        return True