# Copyright 2013 XCG Consulting (http://flectra.consulting)
# Copyright 2018 ACSONE SA/NV
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
import logging

from flectra import _, api, fields, models
from flectra.exceptions import ValidationError
from flectra.tools.misc import find_in_path
from flectra.tools.safe_eval import safe_eval, time

logger = logging.getLogger(__name__)

try:
    from py3o.formats import Formats
except ImportError:
    logger.debug("Cannot import py3o.formats")

PY3O_CONVERSION_COMMAND_PARAMETER = "py3o.conversion_command"


class IrActionsReport(models.Model):
    """Inherit from ir.actions.report to allow customizing the template
    file. The user cam chose a template from a list.
    The list is configurable in the configuration tab, see py3o_template.py
    """

    _inherit = "ir.actions.report"

    @api.constrains("py3o_filetype", "report_type")
    def _check_py3o_filetype(self):
        for report in self:
            if report.report_type == "py3o" and not report.py3o_filetype:
                raise ValidationError(
                    _("Field 'Output Format' is required for Py3O report")
                )

    @api.model
    def _get_py3o_filetypes(self):
        formats = Formats()
        names = formats.get_known_format_names()
        selections = []
        for name in names:
            description = name
            if formats.get_format(name).native:
                description = description + " " + _("(Native)")
            selections.append((name, description))
        return selections

    report_type = fields.Selection(
        selection_add=[("py3o", "py3o")],
        ondelete={
            "py3o": "cascade",
        },
    )

    py3o_filetype = fields.Selection(
        selection="_get_py3o_filetypes", string="Output Format"
    )
    is_py3o_native_format = fields.Boolean(compute="_compute_is_py3o_native_format")
    py3o_template_id = fields.Many2one("py3o.template", "Template")
    module = fields.Char(
        "Module", help="The implementer module that provides this report"
    )
    py3o_template_fallback = fields.Char(
        "Fallback",
        size=128,
        help=(
            "If the user does not provide a template this will be used "
            "it should be a relative path to root of YOUR module "
            "or an absolute path on your server."
        ),
    )
    py3o_multi_in_one = fields.Boolean(
        string="Multiple Records in a Single Report",
        help="If you execute a report on several records, "
        "by default Flectra will generate a ZIP file that contains as many "
        "files as selected records. If you enable this option, Flectra will "
        "generate instead a single report for the selected records.",
    )
    lo_bin_path = fields.Char(
        string="Path to the libreoffice runtime", compute="_compute_lo_bin_path"
    )
    is_py3o_report_not_available = fields.Boolean(
        compute="_compute_py3o_report_not_available"
    )
    msg_py3o_report_not_available = fields.Char(
        compute="_compute_py3o_report_not_available"
    )

    @api.model
    def _register_hook(self):
        self._validate_reports()

    @api.model
    def _validate_reports(self):
        """Check if the existing py3o reports should work with the current
        installation.

        This method log a warning message into the logs for each report
        that should not work.
        """
        for report in self.search([("report_type", "=", "py3o")]):
            if report.is_py3o_report_not_available:
                logger.warning(report.msg_py3o_report_not_available)

    @api.model
    def _get_lo_bin(self):
        lo_bin = (
            self.env["ir.config_parameter"]
            .sudo()
            .get_param(PY3O_CONVERSION_COMMAND_PARAMETER, "libreoffice")
        )
        try:
            lo_bin = find_in_path(lo_bin)
        except IOError:
            lo_bin = None
        return lo_bin

    @api.depends("report_type", "py3o_filetype")
    def _compute_is_py3o_native_format(self):
        fmt = Formats()
        for rec in self:
            rec.is_py3o_native_format = False
            if not rec.report_type == "py3o" or not rec.py3o_filetype:
                continue
            filetype = rec.py3o_filetype
            rec.is_py3o_native_format = fmt.get_format(filetype).native

    def _compute_lo_bin_path(self):
        lo_bin = self._get_lo_bin()
        for rec in self:
            rec.lo_bin_path = lo_bin

    @api.depends("lo_bin_path", "is_py3o_native_format", "report_type")
    def _compute_py3o_report_not_available(self):
        for rec in self:
            rec.is_py3o_report_not_available = False
            rec.msg_py3o_report_not_available = ""
            if not rec.report_type == "py3o":
                continue
            if not rec.is_py3o_native_format and not rec.lo_bin_path:
                rec.is_py3o_report_not_available = True
                rec.msg_py3o_report_not_available = (
                    _(
                        "The libreoffice runtime is required to genereate the "
                        "py3o report '%s' but is not found into the bin path. You "
                        "must install the libreoffice runtime on the server. If "
                        "the runtime is already installed and is not found by "
                        "Flectra, you can provide the full path to the runtime by "
                        "setting the key 'py3o.conversion_command' into the "
                        "configuration parameters."
                    )
                    % rec.name
                )

    @api.model
    def get_from_report_name(self, report_name, report_type):
        return self.search(
            [("report_name", "=", report_name), ("report_type", "=", report_type)]
        )

    def _render_py3o(self, res_ids, data):
        self.ensure_one()
        if self.report_type != "py3o":
            raise RuntimeError(
                "py3o rendition is only available on py3o report.\n"
                "(current: '{}', expected 'py3o'".format(self.report_type)
            )
        return (
            self.env["py3o.report"]
            .create({"ir_actions_report_id": self.id})
            .create_report(res_ids, data)
        )

    def gen_report_download_filename(self, res_ids, data):
        """Override this function to change the name of the downloaded report"""
        self.ensure_one()
        report = self.get_from_report_name(self.report_name, self.report_type)
        if report.print_report_name and not len(res_ids) > 1:
            obj = self.env[self.model].browse(res_ids)
            return safe_eval(report.print_report_name, {"object": obj, "time": time})
        return "{}.{}".format(self.name, self.py3o_filetype)

    def _get_attachments(self, res_ids):
        """Return the report already generated for the given res_ids"""
        self.ensure_one()
        save_in_attachment = {}
        if res_ids:
            # Dispatch the records by ones having an attachment
            Model = self.env[self.model]
            record_ids = Model.browse(res_ids)
            if self.attachment:
                for record_id in record_ids:
                    attachment_id = self.retrieve_attachment(record_id)
                    if attachment_id:
                        save_in_attachment[record_id.id] = attachment_id
        return save_in_attachment