from datetime import date
from typing import Literal

from app.service.models import ReconSummary, Transaction

StatusType = Literal["Matched", "Unmatched", "Pending"]
FlagType = Literal["None", "Duplicate", "Threshold Breach", "Manual Review"]


TRANSACTIONS: list[Transaction] = [
    Transaction(
        transaction_id="TXN-001",
        date=date(2026, 4, 10),
        account="ACC-9821",
        amount=12400.00,
        status="Matched",
        flag="None",
    ),
    Transaction(
        transaction_id="TXN-002",
        date=date(2026, 4, 11),
        account="ACC-4473",
        amount=3750.50,
        status="Unmatched",
        flag="Duplicate",
    ),
    Transaction(
        transaction_id="TXN-003",
        date=date(2026, 4, 11),
        account="ACC-1190",
        amount=88200.00,
        status="Unmatched",
        flag="Threshold Breach",
    ),
    Transaction(
        transaction_id="TXN-004",
        date=date(2026, 4, 12),
        account="ACC-6654",
        amount=540.00,
        status="Matched",
        flag="None",
    ),
    Transaction(
        transaction_id="TXN-005",
        date=date(2026, 4, 13),
        account="ACC-3312",
        amount=21000.00,
        status="Pending",
        flag="Manual Review",
    ),
]


def list_transactions(status: StatusType | None = None, flag: FlagType | None = None) -> list[Transaction]:
    results = TRANSACTIONS
    if status:
        results = [item for item in results if item.status == status]
    if flag:
        results = [item for item in results if item.flag == flag]
    return results


def get_transaction_by_id(transaction_id: str) -> Transaction | None:
    for item in TRANSACTIONS:
        if item.transaction_id == transaction_id:
            return item
    return None


def add_transaction(transaction: Transaction) -> bool:
    if get_transaction_by_id(transaction.transaction_id) is not None:
        return False
    TRANSACTIONS.append(transaction)
    return True


def delete_transaction_by_id(transaction_id: str) -> bool:
    for index, item in enumerate(TRANSACTIONS):
        if item.transaction_id == transaction_id:
            TRANSACTIONS.pop(index)
            return True
    return False


def get_summary() -> ReconSummary:
    return ReconSummary(
        total=len(TRANSACTIONS),
        matched=sum(1 for item in TRANSACTIONS if item.status == "Matched"),
        unmatched=sum(1 for item in TRANSACTIONS if item.status == "Unmatched"),
        pending=sum(1 for item in TRANSACTIONS if item.status == "Pending"),
        flagged=sum(1 for item in TRANSACTIONS if item.flag != "None"),
    )