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


class EducationStudentLedger(models.Model):
    _name = 'education.student.ledger'
    _description = 'Student Financial Ledger'
    _order = 'date asc, id asc'

    student_id = fields.Many2one('education.student', string='Student', required=True, index=True, ondelete='cascade')
    academic_year_id = fields.Many2one('education.academic.year', string='Academic Year', index=True)
    semester_id = fields.Many2one('education.semester', string='Semester', index=True)
    category_id = fields.Many2one('education.fee.category', string='Fee Category', index=True)
    fee_type_id = fields.Many2one('education.fee.type', string='Fee Type', index=True)
    
    date = fields.Date(string='Date', required=True, default=fields.Date.context_today, index=True)
    ref = fields.Char(string='Reference', index=True)
    description = fields.Text(string='Description')
    
    currency_id = fields.Many2one(
        'res.currency',
        string='Currency',
        required=True,
        default=lambda self: self.env.company.currency_id,
    )
    debit = fields.Monetary(string='Debit (Charges)', default=0.0, currency_field='currency_id', index=True)
    credit = fields.Monetary(string='Credit (Payments/Credits)', default=0.0, currency_field='currency_id', index=True)
    balance = fields.Monetary(string='Balance', currency_field='currency_id', index=True)
    status = fields.Selection([
        ('draft', 'Draft'),
        ('outstanding', 'Outstanding'),
        ('paid', 'Paid'),
        ('cancelled', 'Cancelled')
    ], string='Status', default='outstanding', 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,
    )

    def _recalculate_student_balances(self, student_ids):
        for student_id in student_ids:
            lines = self.search([
                ('student_id', '=', student_id),
                ('status', 'in', ('outstanding', 'paid'))
            ], order='date asc, id asc')
            running = 0.0
            for line in lines:
                running += line.debit - line.credit
                self.env.cr.execute(
                    "UPDATE education_student_ledger SET balance = %s WHERE id = %s",
                    (running, line.id)
                )
            # Force metrics recalculation on the student record
            student = self.env['education.student'].browse(student_id)
            student.modified(['ledger_line_ids'])
        self.invalidate_model(['balance'])

    @api.model_create_multi
    def create(self, vals_list):
        records = super().create(vals_list)
        student_ids = records.mapped('student_id').ids
        self._recalculate_student_balances(student_ids)
        return records

    def write(self, vals):
        student_ids = self.mapped('student_id').ids
        res = super().write(vals)
        student_ids = list(set(student_ids + self.mapped('student_id').ids))
        self._recalculate_student_balances(student_ids)
        return res

    def unlink(self):
        student_ids = self.mapped('student_id').ids
        res = super().unlink()
        self._recalculate_student_balances(student_ids)
        return res