# pyrefly: ignore [missing-import]
from odoo import api, fields, models
# pyrefly: ignore [missing-import]
from odoo.exceptions import ValidationError


class EducationStudentPayment(models.Model):
    _name = 'education.student.payment'
    _description = 'Student Payment'
    _order = 'payment_date desc, id desc'
    _rec_name = 'receipt_number'

    receipt_number = fields.Char(string='Receipt Number', required=True, copy=False, readonly=True, default='/', index=True)
    student_id = fields.Many2one('education.student', string='Student', required=True, index=True)
    fee_assignment_id = fields.Many2one('education.fee.assignment', string='Fee Invoice / Assignment', index=True)
    payment_date = fields.Date(string='Payment Date', required=True, default=fields.Date.context_today)
    payment_method = fields.Selection([
        ('cash', 'Cash'),
        ('card', 'Card'),
        ('upi', 'UPI'),
        ('bank', 'Bank Transfer'),
        ('cheque', 'Cheque'),
        ('online', 'Online Payment')
    ], string='Payment Method', required=True, default='cash')
    
    currency_id = fields.Many2one(
        'res.currency',
        string='Currency',
        required=True,
        default=lambda self: self.env.company.currency_id,
    )
    amount = fields.Monetary(string='Amount Paid', required=True, currency_field='currency_id', default=0.0)
    reference_number = fields.Char(string='Reference Number')
    remarks = fields.Text(string='Remarks')
    status = fields.Selection([
        ('draft', 'Draft'),
        ('confirmed', 'Confirmed'),
        ('cancelled', 'Cancelled')
    ], string='Status', default='draft', required=True, index=True)
    active = fields.Boolean(default=True)
    company_id = fields.Many2one(
        'res.company',
        string='Company',
        required=True,
        default=lambda self: self.env.company,
        index=True,
    )

    _sql_constraints = [
        ('uniq_receipt_number', 'unique(receipt_number, company_id)', 'Receipt number must be unique per company.'),
    ]

    @api.constrains('amount')
    def _check_amount(self):
        for rec in self:
            if rec.amount <= 0:
                raise ValidationError('Payment amount must be greater than zero.')

    def action_confirm(self):
        for rec in self:
            if rec.status == 'confirmed':
                continue
            
            outstanding = rec.student_id.outstanding_amount
            if rec.amount > outstanding:
                raise ValidationError(f"Cannot accept payment of {rec.amount} because the student's outstanding balance is {outstanding}.")
            
            if not rec.receipt_number or rec.receipt_number == '/':
                rec.receipt_number = self.env['ir.sequence'].next_by_code('education.student.payment') or '/'
            
            self.env['education.student.ledger'].create({
                'student_id': rec.student_id.id,
                'date': rec.payment_date,
                'ref': rec.receipt_number,
                'description': f"Payment Received - Method: {dict(rec._fields['payment_method'].selection).get(rec.payment_method)} (Ref: {rec.reference_number or 'N/A'})",
                'debit': 0.0,
                'credit': rec.amount,
                'status': 'paid',
                'company_id': rec.company_id.id,
            })
            rec.status = 'confirmed'

    def action_cancel(self):
        for rec in self:
            if rec.status == 'confirmed':
                ledger_entries = self.env['education.student.ledger'].search([
                    ('student_id', '=', rec.student_id.id),
                    ('ref', '=', rec.receipt_number),
                ])
                ledger_entries.unlink()
            rec.status = 'cancelled'

    @api.model_create_multi
    def create(self, vals_list):
        for vals in vals_list:
            if not vals.get('receipt_number') or vals.get('receipt_number') == '/':
                vals['receipt_number'] = self.env['ir.sequence'].next_by_code('education.student.payment') or '/'
        return super().create(vals_list)