# -*- coding: utf-8 -*-
from odoo import models, fields, api, _
from odoo.exceptions import UserError

class GarmentDispatch(models.Model):
    _name = 'garment.dispatch'
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _description = 'Garment Dispatch & Delivery Management'
    _order = 'name desc'

    name = fields.Char(string='Dispatch Order No', required=True, default=lambda self: _('New'), copy=False, tracking=True)
    customer_id = fields.Many2one('res.partner', string='Buyer / Consignee', required=True, tracking=True)
    sale_order_id = fields.Many2one('sale.order', string='Sales Order Ref', tracking=True)
    production_plan_id = fields.Many2one('garment.production.plan', string='Production Plan Ref', tracking=True)
    company_id = fields.Many2one('res.company', string='Company', default=lambda self: self.env.company)
    
    # Dates & Logistics
    date_dispatch = fields.Date(string='Dispatch Date', default=fields.Date.today, tracking=True)
    carrier_name = fields.Char(string='Carrier / Shipping Line')
    bl_awb_no = fields.Char(string='B/L or Air Waybill No', tracking=True)
    container_no = fields.Char(string='Container No (FCL)')
    seal_no = fields.Char(string='Customs Seal No')
    vehicle_no = fields.Char(string='Truck / Vehicle Registration No')
    port_of_loading = fields.Char(string='Port of Loading', default='Tuticorin / Chennai Port')
    port_of_discharge = fields.Char(string='Port of Discharge')
    
    # Cartons & Metrics
    carton_ids = fields.One2many('garment.carton', 'dispatch_id', string='Dispatched Cartons')
    total_cartons = fields.Integer(string='Total Cartons', compute='_compute_totals', store=True)
    total_pieces = fields.Integer(string='Total Garments Dispatched', compute='_compute_totals', store=True)
    total_gross_weight = fields.Float(string='Total Gross Weight (Kg)', compute='_compute_totals', store=True)
    total_cbm = fields.Float(string='Total CBM (m³)', compute='_compute_totals', store=True)
    
    state = fields.Selection([
        ('draft', 'Draft Shipment'),
        ('packed', 'Loaded & Ready to Depart'),
        ('dispatched', 'Dispatched / In Transit'),
        ('delivered', 'Delivered to Customer'),
        ('cancelled', 'Cancelled'),
    ], string='Status', default='draft', tracking=True, required=True)
    notes = fields.Text(string='Shipping Instructions / Marks & Numbers')

    @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('garment.dispatch') or _('DISP/%s') % fields.Date.today().strftime('%Y%m%d')
        return super(GarmentDispatch, self).create(vals_list)

    @api.depends('carton_ids.total_pieces', 'carton_ids.gross_weight_kg', 'carton_ids.cbm')
    def _compute_totals(self):
        for rec in self:
            rec.total_cartons = len(rec.carton_ids)
            rec.total_pieces = sum(rec.carton_ids.mapped('total_pieces'))
            rec.total_gross_weight = round(sum(rec.carton_ids.mapped('gross_weight_kg')), 2)
            rec.total_cbm = round(sum(rec.carton_ids.mapped('cbm')), 3)

    def action_dispatch(self):
        """Dispatches the shipment, deducts Finished Goods inventory"""
        self.ensure_one()
        if not self.carton_ids:
            raise UserError(_("Please attach cartons to dispatch."))

        FG = self.env['garment.finished.goods']
        for ctn in self.carton_ids:
            for line in ctn.line_ids:
                fg = FG.search([
                    ('style_id', '=', ctn.style_id.id),
                    ('color_id', '=', line.color_id.id),
                    ('size_id', '=', line.size_id.id),
                ], limit=1)
                if fg:
                    fg.write({
                        'on_hand_qty': max(0, fg.on_hand_qty - line.quantity),
                        'shipped_qty': fg.shipped_qty + line.quantity,
                    })

        self.write({'state': 'dispatched'})

    def action_mark_delivered(self):
        self.write({'state': 'delivered'})