from odoo import fields, models, api, Command, _
from odoo.addons.project.models.project_task import CLOSED_STATES
import re


class Task(models.Model):
    _inherit = "project.task"

    equipment_ids = fields.Many2many(
        comodel_name="bemade_fsm.equipment",
        relation="bemade_fsm_task_equipment_rel",
        column1="task_id",
        column2="equipment_id",
        string="Equipment to Service",
        tracking=True,
    )

    work_order_contacts = fields.Many2many(
        comodel_name="res.partner",
        relation="task_work_order_contact_rel",
        column1="task_id",
        column2="res_partner_id",
    )

    site_contacts = fields.Many2many(
        comodel_name="res.partner",
        relation="task_site_contact_rel",
        column1="task_id",
        column2="res_partner_id",
    )

    # Override related field to make it return false if this is an FSM subtask
    allow_billable = fields.Boolean(
        string="Can be billed",
        related=False,
        compute="_compute_allow_billable",
        store=True
    )

    visit_id = fields.Many2one(
        comodel_name='bemade_fsm.visit',
        string="Visit",
    )

    relevant_order_lines = fields.Many2many(
        comodel_name='sale.order.line',
        store=False,
        compute='_compute_relevant_order_lines',
    )

    work_order_number = fields.Char(readonly=True)

    propagate_assignment = fields.Boolean(
        string='Propagate Assignment',
        help='Propagate assignment of this task to all subtasks.',
        default=False,
    )

    is_closed = fields.Boolean(
        compute="_compute_is_closed",
    )

    def _compute_is_closed(self):
        for rec in self:
            rec.is_closed = rec.state in CLOSED_STATES

    @api.model_create_multi
    def create(self, vals):
        res = super().create(vals)
        for rec in res:
            if rec.parent_id and rec.is_fsm:
                rec.partner_id = rec.parent_id.partner_id
                if not rec.work_order_contacts and rec.parent_id:
                    rec.work_order_contacts = rec.parent_id.work_order_contacts
                if not rec.site_contacts and rec.parent_id:
                    rec.site_contacts = rec.parent_id.site_contacts
            if rec.sale_order_id:
                seq = 1
                prev_seqs = self.sale_order_id.tasks_ids and \
                            self.sale_order_id.tasks_ids.mapped('work_order_number')
                if prev_seqs:
                    pattern = re.compile(r"(\d+)$")
                    matches = map(lambda n: pattern.search(n), prev_seqs)
                    seq += max(map(lambda n: int(n.group(1)) if n else 0, matches))
                rec.work_order_number = rec.sale_order_id.name.replace('SO', 'SVR', 1) \
                                        + f"-{seq}"
                # If the task is linked to a sales order and has no parent, it should inherit SO work order contacts
                if not rec.parent_id and not rec.work_order_contacts and rec.sale_order_id.work_order_contacts:
                    rec.work_order_contacts = rec.sale_order_id.work_order_contacts
                if not rec.parent_id and not rec.site_contacts and rec.sale_order_id.site_contacts:
                    rec.site_contacts = rec.sale_order_id.site_contacts
        return res

    def write(self, vals):
        res = super().write(vals)
        if not self:  # End recursion on empty RecordSet
            return res
        if 'propagate_assignment' in vals:
            # When a user sets propagate assignment, it should propagate that setting all the way down the chain
            self.child_ids.write({'propagate_assignment': vals['propagate_assignment']})
        if 'user_ids' in vals:
            to_propagate = self.filtered(lambda task: task.propagate_assignment)
            # Here we use child_ids instead of _get_all_subtasks() so as to allow for setting propagate_assignment
            # to false on a child task.
            to_propagate.child_ids.write({'user_ids': vals['user_ids']})
        if 'site_contacts' in vals and self.child_ids:
            self._get_all_subtasks().write({'site_contacts': [Command.set(self.site_contacts.ids)]})
        if 'work_order_contacts' in vals and self.child_ids:
            self._get_all_subtasks().write({'work_order_contacts': [Command.set(self.work_order_contacts.ids)]})
        return res

    @api.depends('sale_order_id')
    def _compute_relevant_order_lines(self):
        for rec in self:
            rec.relevant_order_lines = (
                    rec.sale_order_id and rec.sale_order_id.get_relevant_order_lines(
                rec) or False)

    def _get_closed_stage_by_project(self):
        """ Gets the stage representing completed tasks for each project in
        self.project_id. Copied from industry_fsm/.../project.py:217-221
        for consistency.

        :returns: Dict of project.project -> project.task.type"""
        return {
            project:
                project.type_ids.filtered(lambda stage: stage.is_closed)[:1]
                or project.type_ids[-1:]
            for project in self.project_id
        }

    @api.depends('parent_id.visit_id', 'project_id.is_fsm', 'project_id.allow_billable')
    def _compute_allow_billable(self):
        for rec in self:
            # If an FSM task has a parent that is linked to an SO line, then the parent is the billable one
            if rec.parent_id and not rec.parent_id.visit_id and rec.project_id and rec.project_id.is_fsm:
                rec.allow_billable = False
            else:
                rec.allow_billable = rec.project_id.allow_billable

    def _fsm_create_sale_order_line(self):
        # Override to not generate new lines for tasks that are just linked to a visit item
        self.ensure_one()
        if self.visit_id:
            return
        else:
            super()._fsm_create_sale_order_line()

    def action_fsm_validate(self, stop_running_timers=False):
        # Override to close out subtasks as well
        all_tasks = self | self._get_all_subtasks()
        return super(Task, all_tasks).action_fsm_validate(stop_running_timers)

    def _get_full_hierarchy(self):
        if self.child_ids:
            return self | self.child_ids._get_full_hierarchy()
        return self

    def synchronize_name_fsm(self):
        """ Applies naming to the entire task tree for tasks that are part of this
        recordset. Root tasks are named:

            Partner Shipping Name - Sale Line Name (Template Name)

        Child tasks with sale_line_id are named by their template if set, sale line name
        if not.

        Child tasks not linked to sale lines are left with their original names."""

        all_tasks = self | self._get_all_subtasks()
        for rec in all_tasks:
            assert rec.is_fsm, "This method should only be called on FSM tasks."

            template = rec.sale_line_id and rec.sale_line_id.product_id.task_template_id

            if template:
                title = template.name
            elif rec.sale_line_id:
                name_parts = rec.sale_line_id.name.split('\n')
                title = name_parts and name_parts[0] or rec.sale_line_id.product_id.name
            elif rec.visit_id:
                title = rec.visit_id.label
            else:
                rec.name = rec.name
                return

            client_name = rec.sale_order_id.partner_shipping_id.name

            if not rec.parent_id:
                rec.name = f"{rec.work_order_number} - {client_name} - " f"{title}"
            else:
                rec.name = title

    @property
    def root_ancestor(self):
        return self.parent_id and self.parent_id.root_ancestor or self