from datetime import date, datetime, timedelta

from lxml import etree

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


class AttendanceSheetShift(models.AbstractModel):
    _name = "beesdoo.shift.sheet.shift"
    _description = "Copy of an actual shift into an attendance sheet"
    _order = "task_type_id, worker_name"

    @api.model
    def task_type_default_id(self):
        parameters = self.env["ir.config_parameter"].sudo()
        id = int(
            parameters.get_param(
                "beesdoo_shift.default_task_type_id", default=1
            )
        )
        task_types = self.env["beesdoo.shift.type"]
        return task_types.browse(id)

    # Related actual shift
    task_id = fields.Many2one("beesdoo.shift.shift", string="Task")
    attendance_sheet_id = fields.Many2one(
        "beesdoo.shift.sheet",
        string="Attendance Sheet",
        required=True,
        ondelete="cascade",
    )
    state = fields.Selection(
        [
            ("done", "Present"),
            ("absent_0", "Absent - 0 Compensation"),
            ("absent_1", "Absent - 1 Compensation"),
            ("absent_2", "Absent - 2 Compensations"),
        ],
        string="Shift State",
        required=True,
    )
    worker_id = fields.Many2one(
        "res.partner",
        string="Worker",
        domain=[
            ("eater", "=", "worker_eater"),
            ("working_mode", "in", ("regular", "irregular")),
            ("state", "not in", ("unsubscribed", "resigning")),
        ],
        required=True,
    )
    worker_name = fields.Char(related="worker_id.name", store=True)
    task_type_id = fields.Many2one(
        "beesdoo.shift.type", string="Task Type", default=task_type_default_id
    )
    working_mode = fields.Selection(
        related="worker_id.working_mode", string="Working Mode"
    )
    # The two exclusive booleans are gathered in a simple one
    is_compensation = fields.Boolean(
        string="Compensation shift ?", help="Only for regular workers"
    )


class AttendanceSheetShiftExpected(models.Model):
    """
    Shifts already expected.
    """

    _name = "beesdoo.shift.sheet.expected"
    _description = "Expected Shift"
    _inherit = ["beesdoo.shift.sheet.shift"]

    super_coop_id = fields.Many2one(
        related="task_id.super_coop_id", store=True
    )
    replaced_id = fields.Many2one(
        "res.partner",
        string="Replacement Worker",
        help="Replacement Worker (must be regular)",
        domain=[
            ("eater", "=", "worker_eater"),
            ("working_mode", "=", "regular"),
            ("state", "not in", ("unsubscribed", "resigning")),
        ],
    )

    @api.onchange("replaced_id")
    def on_change_replacement_worker(self):
        if self.replaced_id:
            self.state = "done"


class AttendanceSheetShiftAdded(models.Model):
    """
    Shifts added during time slot.
    """

    _name = "beesdoo.shift.sheet.added"
    _description = "Added Shift"
    _inherit = ["beesdoo.shift.sheet.shift"]

    state = fields.Selection(default="done")

    @api.onchange("working_mode")
    def on_change_working_mode(self):
        self.state = "done"
        self.is_compensation = self.working_mode == "regular"


class AttendanceSheet(models.Model):
    _name = "beesdoo.shift.sheet"
    _inherit = [
        "mail.thread",
        "mail.activity.mixin",
        "barcodes.barcode_events_mixin",
    ]
    _description = "Attendance sheet"
    _order = "start_time"

    name = fields.Char(string="Name", compute="_compute_name")
    time_slot = fields.Char(
        string="Time Slot",
        compute="_compute_time_slot",
        store=True,
        readonly=True,
    )
    active = fields.Boolean(string="Active", default=1)
    state = fields.Selection(
        [("not_validated", "Not Validated"), ("validated", "Validated"),],
        string="State",
        readonly=True,
        index=True,
        default="not_validated",
        track_visibility="onchange",
    )
    start_time = fields.Datetime(
        string="Start Time", required=True, readonly=True
    )
    end_time = fields.Datetime(string="End Time", required=True, readonly=True)
    day = fields.Date(string="Day", compute="_compute_day", store=True)
    day_abbrevation = fields.Char(
        string="Day Abbrevation", compute="_compute_day_abbrevation"
    )
    week = fields.Char(
        string="Week",
        help="Computed from planning name",
        compute="_compute_week",
    )

    expected_shift_ids = fields.One2many(
        "beesdoo.shift.sheet.expected",
        "attendance_sheet_id",
        string="Expected Shifts",
    )
    added_shift_ids = fields.One2many(
        "beesdoo.shift.sheet.added",
        "attendance_sheet_id",
        string="Added Shifts",
    )

    max_worker_no = fields.Integer(
        string="Maximum number of workers",
        default=0,
        readonly=True,
        help="Indicative maximum number of workers.",
    )
    notes = fields.Text(
        "Notes",
        default="",
        help="Notes about the attendance for the Members Office",
    )
    is_annotated = fields.Boolean(
        compute="_compute_is_annotated",
        string="Is annotated",
        readonly=True,
        store=True,
    )
    is_read = fields.Boolean(
        string="Mark as read",
        help="Has notes been read by an administrator ?",
        default=False,
        track_visibility="onchange",
    )
    feedback = fields.Text("Comments about the shift")
    worker_nb_feedback = fields.Selection(
        [
            ("not_enough", "Not enough workers"),
            ("enough", "Enough workers"),
            ("too_many", "Too many workers"),
        ],
        string="Was your team big enough ?",
    )
    validated_by = fields.Many2one(
        "res.partner",
        string="Validated by",
        domain=[
            ("eater", "=", "worker_eater"),
            ("super", "=", True),
            ("working_mode", "=", "regular"),
            ("state", "not in", ("unsubscribed", "resigning")),
        ],
        track_visibility="onchange",
        readonly=True,
    )

    _sql_constraints = [
        (
            "check_not_annotated_mark_as_read",
            "CHECK ((is_annotated=FALSE AND is_read=FALSE) OR is_annotated=TRUE)",
            _("Non-annotated sheets can't be marked as read."),
        )
    ]

    @api.depends("start_time", "end_time")
    def _compute_time_slot(self):
        for rec in self:
            start_time = fields.Datetime.context_timestamp(rec, rec.start_time)
            end_time = fields.Datetime.context_timestamp(rec, rec.end_time)
            rec.time_slot = (
                start_time.strftime("%H:%M")
                + "-"
                + end_time.strftime("%H:%M")
            )

    @api.depends("start_time", "end_time", "week", "day_abbrevation")
    def _compute_name(self):
        for rec in self:
            start_time = fields.Datetime.context_timestamp(rec, rec.start_time)
            name = "[%s] " % fields.Date.to_string(start_time)
            if rec.week:
                name += rec.week + " "
            if rec.day_abbrevation:
                name += rec.day_abbrevation + " "
            if rec.time_slot:
                name += "(%s)" % rec.time_slot
            rec.name = name

    @api.depends("start_time")
    def _compute_day(self):
        for rec in self:
            rec.day = rec.start_time.date()

    @api.depends("expected_shift_ids")
    def _compute_day_abbrevation(self):
        """
        Compute Day Abbrevation from Planning Name
        of first expected shift with one.
        """
        for rec in self:
            for shift in rec.expected_shift_ids:
                if shift.task_id.task_template_id.day_nb_id.name:
                    rec.day_abbrevation = (
                        shift.task_id.task_template_id.day_nb_id.name
                    )

    @api.depends("expected_shift_ids")
    def _compute_week(self):
        """
        Compute Week Name from Planning Name
        of first expected shift with one.
        """
        for rec in self:
            for shift in rec.expected_shift_ids:
                if shift.task_id.planning_id.name:
                    rec.week = shift.task_id.planning_id.name

    @api.depends("notes")
    def _compute_is_annotated(self):
        for rec in self:
            if rec.notes:
                rec.is_annotated = bool(rec.notes.strip())

    @api.constrains("expected_shift_ids", "added_shift_ids")
    def _constrain_unique_worker(self):
        # Warning : map return generator in python3 (for Odoo 12)
        added_ids = [s.worker_id.id for s in self.added_shift_ids]
        expected_ids = [s.worker_id.id for s in self.expected_shift_ids]
        replacement_ids = [
            s.replaced_id.id
            for s in self.expected_shift_ids
            if s.replaced_id.id
        ]
        ids = added_ids + expected_ids + replacement_ids

        if (len(ids) - len(set(ids))) > 0:
            raise UserError(
                _(
                    "You can't add the same worker more than once to an attendance sheet."
                )
            )

    @api.constrains(
        "expected_shift_ids",
        "added_shift_ids",
        "notes",
        "feedback",
        "worker_nb_feedback",
    )
    def _lock_after_validation(self):
        if self.state == "validated":
            raise UserError(
                _("The sheet has already been validated and can't be edited.")
            )

    def on_barcode_scanned(self, barcode):
        if self.state == "validated":
            raise UserError(
                _("A validated attendance sheet can't be modified")
            )

        worker = self.env["res.partner"].search([("barcode", "=", barcode)])

        if not len(worker):
            raise UserError(
                _(
                    "Worker not found (invalid barcode or status). \nBarcode : %s"
                )
                % barcode
            )
        if len(worker) > 1:
            raise UserError(
                _(
                    "Multiple workers are corresponding this barcode. \nBarcode : %s"
                )
                % barcode
            )

        if worker.state == "unsubscribed":
            shift_counter = (
                worker.cooperative_status_ids.sc
                + worker.cooperative_status_ids.sr
            )
            raise UserError(
                _(
                    "Beware, your account is frozen because your shift counter "
                    "is at %s. Please contact Members Office to unfreeze it. "
                    "If you want to attend this shift, your supercoop "
                    "can write your name in the notes field during validation."
                )
                % shift_counter
            )
        if worker.state == "resigning":
            raise UserError(
                _(
                    "Beware, you are recorded as resigning. "
                    "Please contact member's office if this is incorrect. Thank you."
                )
            )
        if worker.working_mode not in ("regular", "irregular"):
            raise UserError(
                _("%s is %s and should be regular or irregular.")
                % (worker.name, worker.working_mode)
            )

        # Expected shifts status update
        for id in self.expected_shift_ids.ids:
            shift = self.env["beesdoo.shift.sheet.expected"].browse(id)
            if (
                shift.worker_id == worker and not shift.replaced_id
            ) or shift.replaced_id == worker:
                shift.state = "done"
                return
            if shift.worker_id == worker and shift.replaced_id:
                raise UserError(
                    _("%s was expected as replaced.") % worker.name
                )

        is_compensation = worker.working_mode == "regular"

        added_ids = [s.worker_id.id for s in self.added_shift_ids]

        if worker.id not in added_ids:
            # Added shift creation
            self.added_shift_ids |= self.added_shift_ids.new(
                {
                    "task_type_id": self.added_shift_ids.task_type_default_id(),
                    "state": "done",
                    "attendance_sheet_id": self._origin.id,
                    "worker_id": worker.id,
                    "is_compensation": is_compensation,
                }
            )

    @api.model
    def create(self, vals):
        new_sheet = super(AttendanceSheet, self).create(vals)

        # Creation and addition of the expected shifts corresponding
        # to the time range
        tasks = self.env["beesdoo.shift.shift"]
        expected_shift = self.env["beesdoo.shift.sheet.expected"]
        # Fix issues with equality check on datetime
        # by searching on a small intervall instead
        delta = timedelta(minutes=1)

        tasks = tasks.search(
            [
                ("start_time", ">", new_sheet.start_time - delta),
                ("start_time", "<", new_sheet.start_time + delta),
                ("end_time", ">", new_sheet.end_time - delta),
                ("end_time", "<", new_sheet.end_time + delta),
            ]
        )
        for task in tasks:
            if task.worker_id and (task.state != "cancel"):
                new_expected_shift = expected_shift.create(
                    {
                        "attendance_sheet_id": new_sheet.id,
                        "task_id": task.id,
                        "worker_id": task.worker_id.id,
                        "replaced_id": task.replaced_id.id,
                        "task_type_id": task.task_type_id.id,
                        "state": "absent_2",
                        "working_mode": task.working_mode,
                        "is_compensation": task.is_compensation,
                    }
                )
        # Maximum number of workers calculation (count empty shifts)
        new_sheet.max_worker_no = len(tasks)
        return new_sheet

    @api.multi
    def button_mark_as_read(self):
        if self.is_read:
            raise UserError(_("The sheet has already been marked as read."))
        self.is_read = True

    # Workaround to display notifications only
    # for unread and not validated sheets, via a check on domain.
    @api.model
    def _needaction_count(self, domain=None):
        if domain == [
            ("is_annotated", "=", True),
            ("is_read", "=", False),
        ] or domain == [("state", "=", "not_validated")]:
            return self.search_count(domain)
        return

    def _validate(self, user):
        self.ensure_one()
        if self.state == "validated":
            raise UserError("The sheet has already been validated.")

        # Expected shifts status update
        for expected_shift in self.expected_shift_ids:
            actual_shift = expected_shift.task_id
            actual_shift.replaced_id = expected_shift.replaced_id
            actual_shift.state = expected_shift.state

            if expected_shift.state != "done":
                mail_template = self.env.ref(
                    "beesdoo_shift.email_template_non_attendance", False
                )
                mail_template.send_mail(expected_shift.task_id.id, True)

        # Added shifts status update
        for added_shift in self.added_shift_ids:
            is_regular_worker = added_shift.worker_id.working_mode == "regular"
            is_compensation = added_shift.is_compensation

            # Edit a non-assigned shift or create one if none

            # Fix issues with equality check on datetime
            # by searching on a small intervall instead
            delta = timedelta(minutes=1)

            non_assigned_shifts = self.env["beesdoo.shift.shift"].search(
                [
                    ("worker_id", "=", False),
                    ("start_time", ">", self.start_time - delta),
                    ("start_time", "<", self.start_time + delta),
                    ("end_time", ">", self.end_time - delta),
                    ("end_time", "<", self.end_time + delta),
                    ("task_type_id", "=", added_shift.task_type_id.id),
                ],
                limit=1,
            )

            if len(non_assigned_shifts):
                actual_shift = non_assigned_shifts[0]
            else:
                actual_shift = self.env["beesdoo.shift.shift"].create(
                    {
                        "name": _("%s (added)" % self.name),
                        "task_type_id": added_shift.task_type_id.id,
                        "start_time": self.start_time,
                        "end_time": self.end_time,
                    }
                )
            actual_shift.write(
                {
                    "state": added_shift.state,
                    "worker_id": added_shift.worker_id.id,
                    "is_regular": not is_compensation and is_regular_worker,
                    "is_compensation": is_compensation and is_regular_worker,
                }
            )
            added_shift.task_id = actual_shift.id

        self.validated_by = user
        self.state = "validated"
        return

    @api.multi
    def validate_with_checks(self):
        self.ensure_one()


        if self.state == "validated":
            raise UserError(_("The sheet has already been validated."))
        if self.start_time > datetime.now():
            raise UserError(
                _(
                    "Attendance sheet can only be validated once the shifts have started."
                )
            )

        # Fields validation
        for added_shift in self.added_shift_ids:
            if not added_shift.worker_id:
                raise UserError(
                    _("Worker name is missing for an added shift.")
                )
            if added_shift.state != "done":
                raise UserError(
                    _("Shift State is missing or wrong for %s")
                    % added_shift.worker_id.name
                )
            if not added_shift.task_type_id:
                raise UserError(
                    _("Task Type is missing for %s")
                    % added_shift.worker_id.name
                )
            if not added_shift.working_mode:
                raise UserError(
                    _("Working mode is missing for %s")
                    % added_shift.worker_id.name
                )
            if added_shift.working_mode not in ["regular", "irregular"]:
                raise UserError(
                    _("Warning : Working mode for %s is %s")
                    % (
                        added_shift.worker_id.name,
                        added_shift.worker_id.working_mode,
                    )
                )

        for expected_shift in self.expected_shift_ids:
            if not expected_shift.state:
                raise UserError(
                    _("Shift State is missing for %s")
                    % expected_shift.worker_id.name
                )
            if (
                expected_shift.state == "absent"
                and not expected_shift.compensation_no
            ):
                raise UserError(
                    _("Compensation number is missing for %s")
                    % expected_shift.worker_id.name
                )

        # Open a validation wizard only if not admin
        if self.env.user.has_group("beesdoo_shift.group_cooperative_admin"):
            if not self.worker_nb_feedback:
                raise UserError(
                    _("Please give your feedback about the number of workers.")
                )
            self._validate(self.env.user.partner_id)
            return
        return {
            "type": "ir.actions.act_window",
            "res_model": "beesdoo.shift.sheet.validate",
            "view_type": "form",
            "view_mode": "form",
            "target": "new",
        }

    @api.model
    def _generate_attendance_sheet(self):
        """
        Generate sheets with shifts in the time interval
        defined from corresponding CRON time interval.
        """

        time_ranges = set()
        tasks = self.env["beesdoo.shift.shift"]
        sheets = self.env["beesdoo.shift.sheet"]
        current_time = datetime.now()
        generation_interval_setting = int(
            self.env["ir.config_parameter"].sudo().get_param(
                "beesdoo_shift.attendance_sheet_generation_interval"
            )
        )

        allowed_time_range = timedelta(minutes=generation_interval_setting)

        tasks = tasks.search(
            [
                ("start_time", ">", str(current_time),),
                ("start_time", "<", str(current_time + allowed_time_range),),
            ]
        )

        for task in tasks:
            start_time = task.start_time
            end_time = task.end_time
            sheets = sheets.search(
                [("start_time", "=", start_time), ("end_time", "=", end_time),]
            )

            if not sheets:
                sheet = sheets.create(
                    {"start_time": start_time, "end_time": end_time}
                )

    @api.model
    def _cron_non_validated_sheets(self):
        sheets = self.env["beesdoo.shift.sheet"]
        non_validated_sheets = sheets.search(
            [
                ("day", "=", date.today() - timedelta(days=1)),
                ("state", "=", "not_validated"),
            ]
        )

        if non_validated_sheets:
            mail_template = self.env.ref(
                "beesdoo_shift.email_template_non_validated_sheet", False
            )
            for rec in non_validated_sheets:
                mail_template.send_mail(rec.id, True)