from odoo import models, fields, api
from odoo.exceptions import ValidationError
import re
import base64

class SchoolApplication(models.Model):
    _name = 'school.application'
    _description = 'Student Application'
    _order = 'name'
    _rec_name = 'name'
    _inherit = ['mail.thread', 'mail.activity.mixin']

    # Link to res.partner
    partner_id = fields.Many2one('res.partner', string="Student Contact", ondelete="cascade")

    # Basic Info
    name = fields.Char(string="Student Name", required=True)
    roll_no = fields.Char(string="Roll Number", readonly=False)
    email = fields.Char(string="Email")
    phone_no = fields.Char(string="Phone Number")
    image = fields.Binary("Profile Photo", store=True)
    address = fields.Text(string="Address")

    # Class and Academic Info
    class_name = fields.Selection([
        ('1', 'Class 1'), ('2', 'Class 2'), ('3', 'Class 3'),
        ('4', 'Class 4'), ('5', 'Class 5'), ('6', 'Class 6'),
        ('7', 'Class 7'), ('8', 'Class 8'), ('9', 'Class 9'),
        ('10', 'Class 10'), ('11', 'Class 11'), ('12', 'Class 12'),
    ], string="Class", required=True)

    academic_year = fields.Char(string="Academic Year")
    gender = fields.Selection([
        ('male', 'Male'), ('female', 'Female'), ('other', 'Other')
    ], string="Gender")

    date_of_birth = fields.Date(string="Date of Birth")
    parent_email = fields.Char(string="Parent Email")

    blood_group = fields.Selection([
        ('a+', 'A+'), ('a-', 'A-'), ('b+', 'B+'), ('b-', 'B-'),
        ('ab+', 'AB+'), ('ab-', 'AB-'), ('o+', 'O+'), ('o-', 'O-')
    ], string="Blood Group")

    school_name = fields.Char(string="Previous School")
    has_disability = fields.Boolean(string="Any Disability")
    is_ex_service_child = fields.Boolean(string="Ex-Service Man's Child")

    caste = fields.Selection([
        ('general', 'General'), ('OBC', 'OBC'), ('SC', 'SC'),
        ('ST', 'ST'), ('other', 'Other')
    ], string="Caste")

    status = fields.Selection([
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('rejected', 'Rejected')
    ], default='pending')

    # Parent Info
    father_name = fields.Char(string="Father's Name")
    father_phone = fields.Char(string="Father's Phone")
    mother_name = fields.Char(string="Mother's Name")
    mother_phone = fields.Char(string="Mother's Phone")
    father_occupation = fields.Char(string="Father's Occupation")
    mother_occupation = fields.Char(string="Mother's Occupation")

    # Admission Query
    admission_query = fields.Text(string="Admission Query")

    # Documents (File Uploads)
    birth_certificate = fields.Binary(string="Birth Certificate")
    birth_certificate_filename = fields.Char(string="Filename")

    tc_certificate = fields.Binary(string="Transfer Certificate")
    tc_certificate_filename = fields.Char(string="TC Filename")

    aadhaar_card = fields.Binary(string="Aadhaar Card")
    aadhaar_card_filename = fields.Char(string="Filename")
    
    @api.onchange('roll_no')
    def _onchange_roll_no(self):
        """Auto-generate roll number only when it's empty and user clicks the field."""
        if not self.roll_no:
            self.roll_no = self.env['ir.sequence'].next_by_code('school.application')
    
    # Constraint on phone number
    @api.constrains('phone_no')
    def _check_phone_no(self):
        for record in self:
            if record.phone_no and not re.fullmatch(r'\d{10}', record.phone_no):
                raise ValidationError("Phone number must contain exactly 10 digits.")

    # Show ID card action
    def action_show_id_card(self):
        self.ensure_one()
        return {
            'type': 'ir.actions.act_window',
            'name': 'ID Card',
            'view_mode': 'form',
            'res_model': 'school.application',
            'res_id': self.id,
            'view_id': self.env.ref('school_management.view_school_id_card_form').id,
            'target': 'new',
        }

    # Optional: Sync partner details with application
    @api.onchange('partner_id')
    def _onchange_partner_id(self):
        if self.partner_id:
            self.name = self.partner_id.name
            self.email = self.partner_id.email
            self.phone_no = self.partner_id.phone
            self.image = self.partner_id.image_1920
            self.address = self.partner_id.contact_address
    
    def print_id_card(self):
        self.ensure_one()
        return self.env.ref('school_management.report_school_id_card').report_action(self)