# -*- coding: utf-8 -*-
# Copyright 2024-2026 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)

r"""Pre-paid service plans (M5).

Architecture:

  product.template
    \--> x_fc_is_service_plan = True
         x_fc_plan_visits_included (e.g. 4)
         x_fc_plan_duration_months (e.g. 12)

  sale.order.confirm()
    \--> for each line whose product is a service plan,
         create a fusion.repair.service.plan.subscription
         (partner + product + visits_included + start_date + end_date)

  fusion.repair.maintenance.contract.create_repair_from_booking()
  visit_report_wizard.action_confirm()
    \--> burns down one visit if the partner has an active matching plan
         (for the same product or category)

  fusion.repair.dashboard.get_dashboard_data()
    \--> exposes active_plan_count + plans_low_count for the dashboard
"""

from dateutil.relativedelta import relativedelta

from odoo import _, api, fields, models


class ProductTemplate(models.Model):
    _inherit = 'product.template'

    x_fc_is_service_plan = fields.Boolean(
        string='Service Plan',
        help='Sell this product as a pre-paid maintenance package. '
             'Confirming a sale order with this product creates a '
             'visit subscription for the customer.',
    )
    x_fc_plan_visits_included = fields.Integer(
        string='Visits Included',
        default=4,
        help='Number of maintenance visits the customer is entitled to under this plan.',
    )
    x_fc_plan_duration_months = fields.Integer(
        string='Plan Duration (months)',
        default=12,
        help='Plan ends this many months after the sale-order date even if visits remain.',
    )
    x_fc_plan_category_id = fields.Many2one(
        'fusion.repair.product.category',
        string='Plan Category',
        help='If set, plan visits only burn down for repairs on equipment of this category. '
             'Leave blank to apply to any equipment from this customer.',
    )


class FusionRepairServicePlanSubscription(models.Model):
    _name = 'fusion.repair.service.plan.subscription'
    _inherit = ['mail.thread']
    _description = 'Pre-paid Service Plan Subscription'
    _order = 'end_date desc, id desc'

    name = fields.Char(
        string='Reference', required=True, default='New',
        copy=False, readonly=True, tracking=True,
    )
    partner_id = fields.Many2one(
        'res.partner', string='Client',
        required=True, tracking=True, index=True,
    )
    product_id = fields.Many2one(
        'product.product', string='Plan Product',
        required=True, tracking=True,
        domain="[('x_fc_is_service_plan', '=', True)]",
    )
    category_id = fields.Many2one(
        'fusion.repair.product.category',
        string='Covers Category',
        help='Computed from the plan product. Only burns visits for repairs '
             'whose category matches.',
    )
    sale_order_id = fields.Many2one(
        'sale.order', string='Sold On',
        ondelete='set null', tracking=True,
    )

    visits_included = fields.Integer(string='Visits Included', required=True, default=4)
    visits_used = fields.Integer(string='Visits Used', default=0, tracking=True)
    visits_remaining = fields.Integer(
        string='Remaining',
        compute='_compute_visits_remaining', store=True,
    )

    start_date = fields.Date(
        string='Start', required=True, default=fields.Date.context_today, tracking=True,
    )
    end_date = fields.Date(string='Expires', required=True, tracking=True)

    state = fields.Selection(
        [
            ('active', 'Active'),
            ('exhausted', 'Visits Exhausted'),
            ('expired', 'Expired'),
            ('cancelled', 'Cancelled'),
        ],
        string='Status',
        compute='_compute_state', store=True, tracking=True,
    )

    company_id = fields.Many2one(
        'res.company', default=lambda self: self.env.company,
    )

    burn_history_ids = fields.One2many(
        'fusion.repair.service.plan.burn',
        'subscription_id',
        string='Burn History',
    )

    # ------------------------------------------------------------------
    # CRUD
    # ------------------------------------------------------------------
    @api.model_create_multi
    def create(self, vals_list):
        for vals in vals_list:
            if vals.get('name', 'New') == 'New':
                vals['name'] = self.env['ir.sequence'].next_by_code(
                    'fusion.repair.service.plan.subscription'
                ) or 'PLAN/NEW'
            if vals.get('product_id') and not vals.get('end_date'):
                product = self.env['product.product'].sudo().browse(vals['product_id'])
                months = product.product_tmpl_id.x_fc_plan_duration_months or 12
                start = vals.get('start_date') or fields.Date.context_today(self)
                vals['end_date'] = fields.Date.from_string(str(start)) + relativedelta(months=months)
            if vals.get('product_id') and 'category_id' not in vals:
                product = self.env['product.product'].sudo().browse(vals['product_id'])
                if product.product_tmpl_id.x_fc_plan_category_id:
                    vals['category_id'] = product.product_tmpl_id.x_fc_plan_category_id.id
            if vals.get('product_id') and 'visits_included' not in vals:
                product = self.env['product.product'].sudo().browse(vals['product_id'])
                vals['visits_included'] = product.product_tmpl_id.x_fc_plan_visits_included or 4
        return super().create(vals_list)

    # ------------------------------------------------------------------
    # COMPUTES
    # ------------------------------------------------------------------
    @api.depends('visits_included', 'visits_used')
    def _compute_visits_remaining(self):
        for s in self:
            s.visits_remaining = (s.visits_included or 0) - (s.visits_used or 0)

    @api.depends('visits_remaining', 'end_date')
    def _compute_state(self):
        today = fields.Date.context_today(self)
        for s in self:
            if s.state == 'cancelled':
                continue
            if s.end_date and s.end_date < today:
                s.state = 'expired'
            elif s.visits_remaining <= 0:
                s.state = 'exhausted'
            else:
                s.state = 'active'

    # ------------------------------------------------------------------
    # BURN ENGINE
    # ------------------------------------------------------------------
    @api.model
    def find_for_repair(self, repair):
        """Return the most-recently-started active subscription covering this
        repair (partner match + category match if the plan specifies one)."""
        if not repair.partner_id:
            return self.browse()
        domain = [
            ('partner_id', '=', repair.partner_id.id),
            ('state', '=', 'active'),
            ('visits_remaining', '>', 0),
        ]
        subs = self.search(domain, order='start_date desc')
        for s in subs:
            if not s.category_id or s.category_id == repair.x_fc_repair_category_id:
                return s
        return self.browse()

    def burn_visit(self, repair):
        """Deduct one visit from this subscription and log the burn."""
        self.ensure_one()
        if self.visits_remaining <= 0:
            return False
        self.visits_used += 1
        self.env['fusion.repair.service.plan.burn'].sudo().create({
            'subscription_id': self.id,
            'repair_order_id': repair.id,
            'burned_on': fields.Date.context_today(self),
        })
        self.message_post(body=_(
            'Visit burned for repair %s. %s of %s remaining.'
        ) % (repair.name, self.visits_remaining, self.visits_included))
        return True

    def action_cancel(self):
        for s in self:
            s.state = 'cancelled'
            s.message_post(body=_('Plan cancelled.'))


class FusionRepairServicePlanBurn(models.Model):
    _name = 'fusion.repair.service.plan.burn'
    _description = 'Service Plan Visit Burn'
    _order = 'burned_on desc, id desc'

    subscription_id = fields.Many2one(
        'fusion.repair.service.plan.subscription',
        string='Subscription', required=True, ondelete='cascade',
    )
    repair_order_id = fields.Many2one(
        'repair.order', string='Repair', required=True, ondelete='cascade',
    )
    burned_on = fields.Date(string='Burned On', required=True,
                            default=fields.Date.context_today)


class SaleOrder(models.Model):
    _inherit = 'sale.order'

    def action_confirm(self):
        res = super().action_confirm()
        # Spawn subscriptions for each service-plan line.
        for order in self:
            for line in order.order_line:
                tmpl = line.product_id.product_tmpl_id
                if not tmpl.x_fc_is_service_plan:
                    continue
                # One subscription per quantity unit (so a SO line with qty=2
                # creates two distinct plans - rare but supported).
                qty = int(line.product_uom_qty or 1)
                for _i in range(max(qty, 1)):
                    self.env['fusion.repair.service.plan.subscription'].sudo().create({
                        'partner_id': order.partner_id.id,
                        'product_id': line.product_id.id,
                        'sale_order_id': order.id,
                        'start_date': fields.Date.context_today(self),
                    })
        # Bundle 9: spawn store labor warranties for any product line with
        # x_fc_labor_warranty_years > 0.
        self._fc_spawn_labor_warranties()
        return res

    def _fc_spawn_labor_warranties(self):
        Warranty = self.env['fusion.repair.labor.warranty'].sudo()
        for order in self:
            for line in order.order_line:
                tmpl = line.product_id.product_tmpl_id
                years = tmpl.x_fc_labor_warranty_years or 0
                if years <= 0:
                    continue
                # One warranty record per unit so each can be voided
                # independently if a specific unit is misused.
                qty = int(line.product_uom_qty or 1)
                for _i in range(max(qty, 1)):
                    Warranty.create({
                        'partner_id': order.partner_id.id,
                        'product_id': line.product_id.id,
                        'sale_order_id': order.id,
                        'warranty_years': years,
                        'start_date': fields.Date.context_today(self),
                    })