#   DrCr: Web-based double-entry bookkeeping framework
#   Copyright (C) 2022–2023  Lee Yingtong Li (RunasSudo)
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU Affero General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU Affero General Public License for more details.
#
#   You should have received a copy of the GNU Affero General Public License
#   along with this program.  If not, see <https://www.gnu.org/licenses/>.

from ..database import db
from ..models import Amount, Posting, Transaction

class StatementLine(db.Model):
	__tablename__ = 'statement_lines'
	
	id = db.Column(db.Integer, primary_key=True)
	
	source_account = db.Column(db.String)
	dt = db.Column(db.DateTime)
	description = db.Column(db.String)
	quantity = db.Column(db.Integer)
	balance = db.Column(db.Integer)
	commodity = db.Column(db.String)
	
	reconciliation = db.relationship('StatementLineReconciliation', back_populates='statement_line', uselist=False)
	
	def amount(self):
		return Amount(self.quantity, self.commodity)
	
	def into_transaction(self):
		if len(self.reconciliations) > 0:
			# Will already be accounted for in a StatementLineTransaction
			raise Exception('Should not call into_transaction on a StatementLine with associated StatementLinePosting')
		
		# Not classified
		unclassified_name = 'Unclassified Statement Line Debits' if -self.quantity >= 0 else 'Unclassified Statement Line Credits'
		
		return Transaction(
			dt=self.dt,
			description=self.description,
			postings=[
				Posting(account=self.source_account, quantity=self.quantity, commodity=self.commodity),
				Posting(account=unclassified_name, quantity=-self.quantity, commodity=self.commodity)
			]
		)
	
	def is_complex(self):
		if self.reconciliation and len(self.reconciliation.posting.transaction.postings) > 2:
			return True
		
		return False

class StatementLineReconciliation(db.Model):
	__tablename__ = 'statement_line_reconciliations'
	
	id = db.Column(db.Integer, primary_key=True)
	
	statement_line_id = db.Column(db.Integer, db.ForeignKey('statement_lines.id'))
	posting_id = db.Column(db.Integer, db.ForeignKey('postings.id'))
	
	statement_line = db.relationship('StatementLine', back_populates='reconciliation')
	posting = db.relationship('Posting')