import uuid

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 case, 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, CostCentre, Product, ProductGroup
from ...models.voucher import Inventory, Journal, Voucher
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.RawMaterialCost)
def report_blank(
    request: Request,
    user: UserToken = Security(get_user, scopes=["raw-material-cost"]),
):
    return {
        "startDate": get_start_date(request.session),
        "finishDate": get_finish_date(request.session),
        "body": [],
        "footer": None,
    }


@router.get("/data", response_model=schemas.RawMaterialCost)
def report_data(
    request: Request,
    s: str = None,
    f: str = None,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["raw-material-cost"]),
):
    body, footer = build_report(
        datetime.strptime(s, "%d-%b-%Y"), datetime.strptime(f, "%d-%b-%Y"), db
    )
    set_period(s, f, request.session)
    return {
        "startDate": s,
        "finishDate": f,
        "body": body,
        "footer": footer,
    }


@router.get("/{id_}", response_model=schemas.RawMaterialCost)
def report_id(
    id_: uuid.UUID,
    request: Request,
    s: str = None,
    f: str = None,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["raw-material-cost"]),
):
    body = build_report_id(
        id_, datetime.strptime(s, "%d-%b-%Y"), datetime.strptime(f, "%d-%b-%Y"), db
    )
    set_period(s, f, request.session)
    return {
        "id": id_,
        "startDate": s,
        "finishDate": f,
        "body": body,
    }


def build_report(start_date: date, finish_date: date, db: Session):
    body = []
    sum_issue = func.sum(
        case([(AccountBase.type == 2, Journal.signed_amount)], else_=0)
    ).label("issue")
    sum_sale = func.sum(
        case([(AccountBase.type == 3, Journal.signed_amount * -1)], else_=0)
    ).label("sale")

    query = (
        db.query(CostCentre, sum_issue, sum_sale)
        .join(CostCentre.journals)
        .join(Journal.voucher)
        .join(Journal.account)
        .filter(Voucher.date >= start_date)
        .filter(Voucher.date <= finish_date)
        .filter(Journal.cost_centre_id != CostCentre.cost_centre_purchase())
        .filter(AccountBase.type.in_([2, 3]))
        .group_by(CostCentre)
        .order_by(sum_sale.desc())
        .all()
    )

    issues = 0
    sales = 0
    for cost_centre, issue, sale in query:
        issues += issue
        sales += sale
        rmc = 0 if sale == 0 else issue / sale
        body.append(
            {
                "name": cost_centre.name,
                "issue": issue,
                "sale": sale,
                "rmc": rmc,
                "url": ["/", "raw-material-cost", str(cost_centre.id)],
            }
        )

    rmc = 0 if sales == 0 else issues / sales
    return body, {"name": "Total", "issue": issues, "sale": sales, "rmc": rmc}


def build_report_id(
    cost_centre_id: uuid.UUID, start_date: date, finish_date: date, db: Session
):
    sum_quantity = func.sum(Inventory.quantity * Journal.debit).label("quantity")
    sum_net = func.sum(Inventory.rate * Inventory.quantity * Journal.debit).label("net")
    sum_gross = func.sum(Inventory.amount * Journal.debit).label("gross")

    query = (
        db.query(Product, sum_quantity, sum_net, sum_gross)
        .join(Product.inventories)
        .join(Inventory.voucher)
        .join(Voucher.journals)
        .join(Product.product_group)
        .filter(Voucher.date >= start_date)
        .filter(Voucher.date <= finish_date)
        .filter(Voucher.type == 3)
        .filter(Journal.cost_centre_id == cost_centre_id)
        .group_by(Product)
        .group_by(Journal.debit)
        .group_by(ProductGroup.name)
        .order_by(ProductGroup.name)
        .order_by(sum_net.desc())
        .all()
    )

    groups = {}
    counter = 0
    list_ = []
    for product, quantity, net, gross in query:
        if product.product_group_id in groups:
            group = groups[product.product_group_id]
            group["net"] += net
            group["gross"] += gross
        else:
            counter += 500
            group = {
                "group": product.product_group.name,
                "net": net,
                "gross": gross,
                "order": counter,
                "heading": True,
            }
            groups[product.product_group_id] = group
        counter += 1
        list_.append(
            {
                "name": product.full_name,
                "quantity": quantity,
                "net": net,
                "gross": gross,
                "order": counter,
                "heading": False,
            }
        )

    for item in groups.values():
        list_.append(item)

    return sorted(list_, key=lambda d: d["order"])