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


class EducationFeeAssignment(models.Model):
    _name = 'education.fee.assignment'
    _description = 'Student Fee Assignment'
    _order = 'assignment_date desc'

    student_id = fields.Many2one('education.student', string='Student', required=True, index=True)
    academic_year_id = fields.Many2one('education.academic.year', string='Academic Year', required=True, index=True)
    semester_id = fields.Many2one('education.semester', string='Semester', required=True, index=True)
    fee_structure_id = fields.Many2one('education.fee.structure', string='Fee Structure', required=True, index=True)
    assignment_date = fields.Date(string='Assignment Date', required=True, default=fields.Date.context_today)
    state = fields.Selection([
        ('draft', 'Draft'),
        ('confirmed', 'Confirmed'),
    ], 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_assignment', 'unique(student_id, academic_year_id, semester_id, fee_structure_id, company_id)', 'This fee structure is already assigned to this student for this semester.'),
    ]

    def action_confirm(self):
        for rec in self:
            if rec.state == 'confirmed':
                continue
            if not rec.fee_structure_id.line_ids:
                raise ValidationError(f"The selected fee structure '{rec.fee_structure_id.name}' has no fee lines. Please add fee lines to this structure before confirming.")
            for line in rec.fee_structure_id.line_ids:
                self.env['education.student.ledger'].create({
                    'student_id': rec.student_id.id,
                    'academic_year_id': rec.academic_year_id.id,
                    'semester_id': rec.semester_id.id,
                    'category_id': line.fee_type_id.category_id.id,
                    'fee_type_id': line.fee_type_id.id,
                    'date': rec.assignment_date,
                    'ref': f"FEE/{rec.id}",
                    'description': f"{line.fee_type_id.name} (Assigned via {rec.fee_structure_id.name})",
                    'debit': line.amount,
                    'credit': 0.0,
                    'status': 'outstanding',
                    'company_id': rec.company_id.id,
                })
            rec.state = 'confirmed'

    def action_cancel(self):
        for rec in self:
            if rec.state == 'confirmed':
                ledger_entries = self.env['education.student.ledger'].search([
                    ('student_id', '=', rec.student_id.id),
                    ('ref', '=', f"FEE/{rec.id}"),
                ])
                ledger_entries.unlink()
            rec.state = 'draft'