from __future__ import annotations
import logging
from ..tools.odoo_client import OdooClient

logger = logging.getLogger(__name__)


class ExpensesTools:
    def __init__(self, odoo: OdooClient):
        self._o = odoo

    async def get_expenses(self, employee_id: int = None, state: str = None,
                            date_from: str = None, date_to: str = None, limit: int = 50) -> list:
        domain = []
        if employee_id:
            domain.append(('employee_id', '=', employee_id))
        if state:
            domain.append(('state', '=', state))
        if date_from:
            domain.append(('date', '>=', date_from))
        if date_to:
            domain.append(('date', '<=', date_to))
        fields = ['name', 'employee_id', 'product_id', 'total_amount', 'date',
                  'state', 'sheet_id', 'description']
        return await self._o.search_read('hr.expense', domain, fields, limit=limit)

    async def get_expense_sheets(self, state: str = None, employee_id: int = None,
                                  limit: int = 50) -> list:
        domain = []
        if state:
            domain.append(('state', '=', state))
        if employee_id:
            domain.append(('employee_id', '=', employee_id))
        fields = ['name', 'employee_id', 'state', 'total_amount', 'date',
                  'accounting_date', 'journal_id']
        return await self._o.search_read('hr.expense.sheet', domain, fields, limit=limit)

    async def get_pending_approvals(self) -> list:
        return await self._o.search_read(
            'hr.expense.sheet',
            [('state', '=', 'submit')],
            ['name', 'employee_id', 'total_amount', 'date'],
            limit=100,
        )

    async def approve_expense_sheet(self, sheet_id: int) -> bool:
        try:
            await self._o.call('hr.expense.sheet', 'approve_expense_sheets', [[sheet_id]])
            logger.info('Approved expense sheet %s', sheet_id)
            return True
        except Exception as exc:
            logger.warning('approve_expense_sheet failed %s: %s', sheet_id, exc)
            return False

    async def get_expenses_summary(self, date_from: str = None, date_to: str = None) -> dict:
        domain = [('state', 'not in', ['refused'])]
        if date_from:
            domain.append(('date', '>=', date_from))
        if date_to:
            domain.append(('date', '<=', date_to))
        expenses = await self._o.search_read('hr.expense', domain, ['total_amount', 'employee_id', 'product_id'], limit=1000)
        total = sum(e.get('total_amount', 0) for e in expenses)
        pending_sheets = await self.get_pending_approvals()
        return {
            'total_expenses': len(expenses),
            'total_amount': total,
            'pending_approval_count': len(pending_sheets),
            'pending_amount': sum(s.get('total_amount', 0) for s in pending_sheets),
        }

    async def get_expense_by_employee(self, employee_id: int, limit: int = 20) -> list:
        return await self._o.search_read(
            'hr.expense',
            [('employee_id', '=', employee_id)],
            ['name', 'total_amount', 'date', 'state', 'product_id'],
            limit=limit,
        )

    async def flag_for_review(self, model: str, record_id: int, reason: str, severity: str = 'medium') -> bool:
        msg = f'[AI FLAG - {severity.upper()}] {reason}'
        await self._o.call(model, 'message_post', [[record_id]], {'body': msg, 'message_type': 'comment'})
        return True

    async def post_chatter_note(self, model: str, record_id: int, note: str) -> bool:
        await self._o.call(model, 'message_post', [[record_id]], {'body': note, 'message_type': 'comment'})
        return True

    async def get_employee_id_for_user(self, user_id) -> int | None:
        if not user_id:
            return None
        try:
            records = await self._o.search_read(
                'hr.employee', [('user_id', '=', int(user_id))], ['id', 'name'], limit=1)
            return records[0]['id'] if records else None
        except Exception as exc:
            logger.warning('get_employee_id_for_user failed user_id=%s: %s', user_id, exc)
            return None

    async def get_default_expense_product(self) -> int | None:
        try:
            records = await self._o.search_read(
                'product.product',
                [('can_be_expensed', '=', True), ('type', '=', 'service')],
                ['id', 'name'], limit=1)
            return records[0]['id'] if records else None
        except Exception as exc:
            logger.warning('get_default_expense_product failed: %s', exc)
            return None

    async def get_expense_products(self) -> list:
        """Return all expensable products for category selection."""
        try:
            return await self._o.search_read(
                'product.product',
                [('can_be_expensed', '=', True)],
                ['id', 'name'], limit=100)
        except Exception as exc:
            logger.warning('get_expense_products failed: %s', exc)
            return []

    async def create_expense_sheet(self, name: str, employee_id: int):
        return await self._o.create('hr.expense.sheet', {
            'name': name,
            'employee_id': employee_id,
        })

    async def create_expense(self, sheet_id: int, employee_id: int, name: str,
                              total_amount: float, date: str, product_id: int = None,
                              description: str = ''):
        vals: dict = {
            'name': name,
            'employee_id': employee_id,
            'sheet_id': sheet_id,
            'total_amount': total_amount,
            'quantity': 1.0,
        }
        if date:
            vals['date'] = date
        if product_id:
            vals['product_id'] = product_id
        return await self._o.create('hr.expense', vals)

    async def attach_receipt(self, model: str, record_id: int, filename: str,
                              file_b64: str, mimetype: str) -> bool:
        try:
            await self._o.create('ir.attachment', {
                'name': filename,
                'datas': file_b64,
                'res_model': model,
                'res_id': record_id,
                'mimetype': mimetype,
            })
            return True
        except Exception as exc:
            logger.warning('attach_receipt failed %s/%s: %s', model, record_id, exc)
            return False