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

class SocialWhatsAppTemplate(models.Model):
    _name = 'social.whatsapp.template'
    _description = 'WhatsApp Business Template Mapping'
    _order = 'sequence, id'

    name = fields.Char(string='Mapping Name', required=True)
    sequence = fields.Integer(string='Sequence', default=10)
    event_type = fields.Selection([
        ('order_confirmed', 'Order Confirmed'),
        ('order_processing', 'Order Processing / Being Prepared'),
        ('order_shipped', 'Order Shipped / Out for Delivery'),
        ('order_delivered', 'Order Delivered'),
        ('customer_enquiry', 'Inquiry Auto-Reply'),
    ], string='Trigger Event', required=True, index=True)
    template_name = fields.Char(string='Meta Approved Template Name', required=True,
                                help='Exact template name created and approved in Meta WhatsApp Business Manager.')
    language_code = fields.Char(string='Language Code', default='en_US', required=True,
                                help='Language code (e.g. en_US, en, es_LA, fr).')
    is_active = fields.Boolean(string='Active', default=True)
    company_id = fields.Many2one('res.company', string='Company', default=lambda self: self.env.company)

    # Dynamic Field Mappings for Body Parameters {{1}}, {{2}}, {{3}}, {{4}}
    param_1_field = fields.Selection([
        ('order_name', 'Order Reference (e.g. SO1234)'),
        ('partner_name', 'Customer Name'),
        ('amount_total', 'Order Total Amount'),
        ('carrier_name', 'Carrier / Delivery Method'),
        ('tracking_number', 'Tracking / ETA Reference'),
        ('tracking_url', 'Order / Tracking URL'),
    ], string='Parameter 1 ({{1}})', default='order_name')

    param_2_field = fields.Selection([
        ('order_name', 'Order Reference (e.g. SO1234)'),
        ('partner_name', 'Customer Name'),
        ('amount_total', 'Order Total Amount'),
        ('carrier_name', 'Carrier / Delivery Method'),
        ('tracking_number', 'Tracking / ETA Reference'),
        ('tracking_url', 'Order / Tracking URL'),
    ], string='Parameter 2 ({{2}})', default='partner_name')

    param_3_field = fields.Selection([
        ('order_name', 'Order Reference (e.g. SO1234)'),
        ('partner_name', 'Customer Name'),
        ('amount_total', 'Order Total Amount'),
        ('carrier_name', 'Carrier / Delivery Method'),
        ('tracking_number', 'Tracking / ETA Reference'),
        ('tracking_url', 'Order / Tracking URL'),
    ], string='Parameter 3 ({{3}})', default='amount_total')

    param_4_field = fields.Selection([
        ('order_name', 'Order Reference (e.g. SO1234)'),
        ('partner_name', 'Customer Name'),
        ('amount_total', 'Order Total Amount'),
        ('carrier_name', 'Carrier / Delivery Method'),
        ('tracking_number', 'Tracking / ETA Reference'),
        ('tracking_url', 'Order / Tracking URL'),
    ], string='Parameter 4 ({{4}})', default='tracking_url')

    description = fields.Text(string='Description / Template Copy',
                              help='Human-readable preview of the template content approved in Meta.')

    _sql_constraints = [
        ('event_company_unique', 'unique(event_type, company_id)',
         'Only one active template mapping can be configured per event type for each company.')
    ]

    def _get_field_value(self, field_type, order, picking=None):
        if not field_type or not order:
            return ""
        base_url = self.env['ir.config_parameter'].sudo().get_param('web.base.url', '').rstrip('/')
        if field_type == 'order_name':
            return order.name or ''
        elif field_type == 'partner_name':
            return order.partner_id.name or 'Customer'
        elif field_type == 'amount_total':
            curr = order.currency_id.symbol or order.currency_id.name or '$'
            return f"{curr}{order.amount_total:.2f}"
        elif field_type == 'carrier_name':
            if picking and hasattr(picking, 'carrier_id') and picking.carrier_id:
                return picking.carrier_id.name
            return "Standard Delivery"
        elif field_type == 'tracking_number':
            if picking and hasattr(picking, 'carrier_tracking_ref') and picking.carrier_tracking_ref:
                return picking.carrier_tracking_ref
            return order.name
        elif field_type == 'tracking_url':
            return f"{base_url}/my/orders/{order.id}"
        return ""

    def build_parameters(self, order, picking=None):
        """Builds parameter list for Meta template body interpolation."""
        self.ensure_one()
        params = []
        for fld in (self.param_1_field, self.param_2_field, self.param_3_field, self.param_4_field):
            if fld:
                val = self._get_field_value(fld, order, picking)
                if val:
                    params.append(val)
        return params