from datetime import date, datetime

import brewman.schemas.reports as schemas

from fastapi import APIRouter, Depends, Request, Security
from sqlalchemy.orm import Session
from sqlalchemy.sql.expression import desc, func

from ...core.security import get_current_active_user as get_user
from ...core.session import get_finish_date, get_start_date, set_period
from ...db.session import SessionLocal
from ...models.master import AccountBase, AccountType
from ...models.voucher import Journal, Voucher, VoucherType
from ...routers.reports.closing_stock import get_closing_stock
from ...routers.reports.profit_loss import get_accumulated_profit
from ...schemas.auth import UserToken


router = APIRouter()


# Dependency
def get_db() -> Session:
    try:
        db = SessionLocal()
        yield db
    finally:
        db.close()


@router.get("", response_model=schemas.BalanceSheet)
def report_blank(
    request: Request,
    user: UserToken = Security(get_user, scopes=["balance-sheet"]),
):
    return {"date": get_finish_date(request.session), "body": [], "footer": None}


@router.get("/{date_}", response_model=schemas.BalanceSheet)
def report_data(
    date_: str,
    request: Request,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["balance-sheet"]),
):
    body, footer = build_balance_sheet(datetime.strptime(date_, "%d-%b-%Y"), db)
    set_period(get_start_date(request.session), date_, request.session)
    return {"date": date_, "body": body, "footer": footer}


def build_balance_sheet(date_: date, db: Session):
    type_list = [i.id for i in AccountType.list() if i.balance_sheet]
    report = []
    groups = dict()
    # Add Net Profit / Loss
    closing_stock = round(get_closing_stock(date_, db), 2)
    net_profit = round(get_accumulated_profit(date_, db), 2) - closing_stock
    total_amount = net_profit
    report.append(
        {
            "name": "Net Loss" if net_profit >= 0 else "Net Profit",
            "subAmount": round(net_profit, 2),
            "order": 79000,
        }
    )

    capital_group = AccountType.by_id(5)
    groups[capital_group.id] = {
        "group": capital_group.name,
        "amount": round(total_amount, 2),
        "order": capital_group.order,
    }

    total_amount += closing_stock
    report.append(
        {"name": "Closing Stock", "subAmount": round(closing_stock, 2), "order": 20001}
    )

    asset_group = AccountType.by_id(4)
    groups[asset_group.id] = {
        "group": asset_group.name,
        "amount": round(closing_stock, 2),
        "order": asset_group.order,
    }

    amount_sum = func.sum(Journal.amount * Journal.debit)
    query = (
        db.query(AccountBase, amount_sum)
        .join(Journal.voucher)
        .join(Journal.account)
        .filter(Voucher.date <= date_)
        .filter(Voucher.type != VoucherType.by_name("Issue").id)
        .filter(AccountBase.type.in_(type_list))
        .group_by(AccountBase)
        .order_by(AccountBase.type)
        .order_by(desc(func.abs(amount_sum)))
        .all()
    )

    counter = 0
    for account, amount in query:
        # Add Items
        account_type = AccountType.by_id(account.type)
        total_amount += amount
        if amount != 0:
            counter += 1
            report.append(
                {
                    "name": account.name,
                    "subAmount": round(amount, 2),
                    "order": account_type.order + counter,
                }
            )
            if account_type.id in groups:
                groups[account_type.id]["amount"] = round(
                    groups[account_type.id]["amount"] + amount, 2
                )
            else:
                groups[account_type.id] = {
                    "group": account_type.name,
                    "amount": round(amount, 2),
                    "order": account_type.order,
                }

    # Add Subtotals
    for item in groups.values():
        report.append(item)

    footer = {"name": "Total", "amount": round(total_amount, 2), "order": 100000}
    return sorted(report, key=lambda d: d["order"]), footer