from odoo import api, fields, models
from dateutil.relativedelta import relativedelta


class FlChild(models.Model):
    _name = 'fl.child'
    _description = 'Child on Case'
    _order = 'date_of_birth'

    case_id = fields.Many2one(
        'fl.case', string='Case',
        required=True, ondelete='cascade', index=True
    )
    name = fields.Char(string='Full Name', required=True)
    date_of_birth = fields.Date(string='Date of Birth', required=True)
    age = fields.Integer(
        string='Age', compute='_compute_age', store=True
    )
    gender = fields.Selection([
        ('m', 'Male'),
        ('f', 'Female'),
        ('x', 'Non-binary / Other'),
    ], string='Gender')
    school = fields.Char(string='School')
    medical_provider = fields.Char(string='Primary Care Provider')

    # ── Support Per Child ──────────────────────────────────────────────────
    support_amount = fields.Float(
        string='Support Amount This Child ($)',
        help='Per-child support amount from the calculation'
    )
    health_insurance_premium = fields.Float(
        string='Health Insurance Premium ($)',
        help='Monthly cost of health insurance for this child only'
    )
    childcare_cost = fields.Float(
        string='Work-Related Childcare ($)',
        help='FL 61.30(7): Only work or job-search related childcare costs qualify'
    )
    extraordinary_expenses = fields.Float(
        string='Extraordinary Expenses ($)',
        help='FL 61.30(9): Medical or educational expenses beyond ordinary child-rearing costs'
    )

    # ── Emancipation Tracking ──────────────────────────────────────────────
    emancipation_date = fields.Date(
        string='Emancipation Date',
        compute='_compute_emancipation',
        store=True,
        help='18th birthday (or high school graduation, whichever is later). '
             'Support terminates on this date.'
    )
    approaching_emancipation = fields.Boolean(
        string='Approaching Emancipation',
        compute='_compute_approaching_emancipation',
        store=True,
        help='True when emancipation is within 90 days'
    )
    emancipation_alert_sent = fields.Boolean(
        string='Emancipation Alert Sent',
        default=False
    )
    emancipated = fields.Boolean(
        string='Emancipated',
        compute='_compute_emancipated',
        store=True
    )
    days_until_emancipation = fields.Integer(
        string='Days Until Emancipation',
        compute='_compute_approaching_emancipation'
    )

    # ── Early Emancipation Factors ─────────────────────────────────────────
    married = fields.Boolean(
        string='Child is Married',
        help='Marriage constitutes emancipation under FL law'
    )
    active_military = fields.Boolean(
        string='Active Military Service',
        help='Active duty military service constitutes emancipation under FL law'
    )
    declared_emancipated = fields.Boolean(
        string='Court-Declared Emancipated',
        help='Court has entered an order declaring this child emancipated'
    )
    emancipation_notes = fields.Text(
        string='Emancipation Notes',
        help='Document basis for any early emancipation determination'
    )

    # ── Computed ──────────────────────────────────────────────────────────

    @api.depends('date_of_birth')
    def _compute_age(self):
        today = fields.Date.today()
        for rec in self:
            if rec.date_of_birth:
                delta = relativedelta(today, rec.date_of_birth)
                rec.age = delta.years
            else:
                rec.age = 0

    @api.depends('date_of_birth')
    def _compute_emancipation(self):
        for rec in self:
            if rec.date_of_birth:
                rec.emancipation_date = rec.date_of_birth + relativedelta(years=18)
            else:
                rec.emancipation_date = False

    @api.depends('emancipation_date', 'married', 'active_military', 'declared_emancipated')
    def _compute_approaching_emancipation(self):
        today = fields.Date.today()
        for rec in self:
            # Early emancipation factors
            if rec.married or rec.active_military or rec.declared_emancipated:
                rec.approaching_emancipation = False
                rec.days_until_emancipation = 0
                continue
            if rec.emancipation_date:
                days_remaining = (rec.emancipation_date - today).days
                rec.days_until_emancipation = max(days_remaining, 0)
                rec.approaching_emancipation = 0 < days_remaining <= 90
            else:
                rec.approaching_emancipation = False
                rec.days_until_emancipation = 0

    @api.depends('emancipation_date', 'married', 'active_military', 'declared_emancipated')
    def _compute_emancipated(self):
        today = fields.Date.today()
        for rec in self:
            if rec.married or rec.active_military or rec.declared_emancipated:
                rec.emancipated = True
            elif rec.emancipation_date:
                rec.emancipated = today >= rec.emancipation_date
            else:
                rec.emancipated = False

    # ── Cron ──────────────────────────────────────────────────────────────

    def _cron_emancipation_alerts(self):
        """
        Run daily via ir.cron.
        Sends chatter alert on cases where a child is approaching emancipation
        and no alert has been sent yet.
        """
        approaching = self.search([
            ('approaching_emancipation', '=', True),
            ('emancipation_alert_sent', '=', False),
        ])
        for child in approaching:
            days = child.days_until_emancipation
            child.case_id.message_post(
                body=(
                    f'<strong>⚠️ EMANCIPATION ALERT</strong><br/>'
                    f'<b>{child.name}</b> will turn 18 on '
                    f'<b>{child.emancipation_date}</b> '
                    f'({days} days from today).<br/>'
                    f'Child support for this child terminates on that date.<br/>'
                    f'<b>Action required:</b> A Motion to Modify should be filed '
                    f'at least 60 days before emancipation to address the change '
                    f'in support obligation.'
                ),
                subtype_xmlid='mail.mt_note',
            )
            child.emancipation_alert_sent = True