import arrow

from decimal import Decimal
from typing import Literal
from datetime import date
from dataclasses import dataclass


@dataclass
class GecikmeFaizSonucu:
    faiz_turu: str
    gecikme_gunu: int
    gunluk_oran: float
    faiz: float
    bsmv: float
    kkdf: float
    toplam: float


# Faiz türüne göre aylık faiz oranı (%)
GLOBAL_FAIZ_ORANLARI = {"akdi": 5.0, "gecikme": 5.3}

# Vergi oranları (%)
GLOBAL_BSMV_ORANI = 15.0
GLOBAL_KKDF_ORANI = 15.0


def hesapla_komisyon(vade_tarihi: date, islem_tarihi: date, tutar: float, oran: float) -> float:
    gecikme = (islem_tarihi - vade_tarihi).days
    if gecikme <= 0:
        return 0.0
    komisyon = tutar * oran * gecikme
    return round(komisyon, 2)


def hesapla_gunluk_oran(
    faiz_orani: float, tip: Literal["MIR", "YIR"], gun: int = 0
) -> float:
    """
    orijinal_oran: Yıllık ya da aylık faiz oranı (örneğin %12 için 0.12)
    tip: 'MIR' (Monthly Interest Rate) ya da 'YIR' (Yearly Interest Rate)
    """
    faiz_orani = faiz_orani / 100
    if tip.upper() == "MIR":
        if gun < 1:
            gun = 30
        return faiz_orani / gun  # varsayılan aylık 30 gün
    elif tip.upper() == "YIR":
        if gun < 1:
            gun = 360
        return faiz_orani / gun  # varsayılan yıl 365 gün
    else:
        raise ValueError("Faiz tipi yalnızca 'MIR' ya da 'YIR' olabilir.")


def hesapla_gecikme_faizi(
    borc: float, vade_tarihi: date, islem_tarihi: date | None = None, faiz_orani: float = None, faiz_turu: str = "akdi", bsmv_orani: float = None, kkdf_orani: float = None,
) -> GecikmeFaizSonucu:

    if islem_tarihi is None:
        islem_tarihi = date.today()
    gecikme_gun = (arrow.get(islem_tarihi) - arrow.get(vade_tarihi)).days
    if gecikme_gun <= 0:
        return GecikmeFaizSonucu(faiz_turu, 0, 0, 0, 0, 0, 0)
    
    # Varsayılan oranları içerden bağla
    if faiz_orani is None:
        faiz_orani = GLOBAL_FAIZ_ORANLARI.get(faiz_turu, 5.0)
    if bsmv_orani is None:
        bsmv_orani = GLOBAL_BSMV_ORANI
    if kkdf_orani is None:
        kkdf_orani = GLOBAL_KKDF_ORANI

    faiz_tipi = "MIR" if faiz_turu == "akdi" else "YIR"
    gunluk_oran = hesapla_gunluk_oran(faiz_orani, faiz_tipi)

    faiz_tutari = Decimal(borc) * Decimal(gunluk_oran) * Decimal(gecikme_gun)
    bsmv = Decimal(faiz_tutari) * Decimal(bsmv_orani / 100)
    kkdf = Decimal(faiz_tutari) * Decimal(kkdf_orani / 100)
    toplam_faiz = Decimal(faiz_tutari) + Decimal(bsmv) + Decimal(kkdf)

    return GecikmeFaizSonucu(
        faiz_turu=faiz_turu, gecikme_gunu=gecikme_gun, gunluk_oran=round(gunluk_oran, 6), faiz=round(faiz_tutari, 2), bsmv=round(bsmv, 2), kkdf=round(kkdf, 2), toplam=round(toplam_faiz, 4),
    )

"""
    2025 Güncel Oranlar (TCMB verilerine göre)
    tip: 'MIR' (Monthly Interest Rate) ya da 'YIR' (Yearly Interest Rate)
    Faiz Türü	    Aylık Oran	Günlük Yaklaşık	    Açıklama
    Akdi Faiz	    %5,00	    %0,1667	            Asgari üzerindeki borca uygulanır
    Gecikme Faizi	%5,30	    %0,1767	            Asgari tutarın ödenmeyen kısmına uygulanır

CREATE TABLE public.account_delay_interest ( 

    account_records_id int4  NOT NULL,
    build_decision_book_payment_id int4  NOT NULL,
    build_decision_book_payment_refid varchar(100)  NOT NULL,
    interest_turn varchar(10) NOT NULL, 
    interest_rate numeric(10, 2) NOT NULL, 
    delay_day int2 NOT NULL, 
    daily_rate numeric(20, 6) NOT NULL, 
    interest numeric(20, 6) NOT NULL, 
    bsmv numeric(20, 6) NOT NULL, 
    kkdf numeric(20, 6) NOT NULL, 
    total numeric(20, 6) NOT NULL,
    new_build_decision_book_payment_id int4 NULL,
    approved_record bool false NOT NULL,
    approving_person int4  NOT NULL,
    approving_at timestamptz NULL,
    
    id serial4 NOT NULL, 
    uu_id uuid DEFAULT gen_random_uuid() NOT NULL, 
    expiry_starts timestamptz DEFAULT now() NOT NULL, 
    expiry_ends timestamptz DEFAULT now() NOT NULL, 
    created_at timestamptz DEFAULT now() NOT NULL, 
    updated_at timestamptz DEFAULT now() NOT NULL, 
    CONSTRAINT account_delay_interest_pkey PRIMARY KEY (id))
    
    CREATE UNIQUE INDEX _account_delay_interest_ndx_01 ON public.account_delay_interest USING btree (account_records_id, build_decision_book_payment_id);
    CREATE INDEX _account_delay_interest_ndx_02 ON public.account_delay_interest USING btree (build_decision_book_payment_id);
    CREATE UNIQUE INDEX _account_delay_interest_ndx_03 ON public.account_delay_interest USING btree (build_decision_book_payment_refid);
    CREATE UNIQUE INDEX _account_delay_interest_ndx_04 ON public.account_delay_interest USING btree (uu_id);
    
-- Column comments
COMMENT ON COLUMN public.account_delay_interest.build_decision_book_payment_refid IS 'ref id';
COMMENT ON COLUMN public.account_delay_interest.interest_turn IS 'faiz turu';
COMMENT ON COLUMN public.account_delay_interest.interest_rate IS 'uygulanan faiz';
COMMENT ON COLUMN public.account_delay_interest.delay_day IS 'gecikme_gunu';
COMMENT ON COLUMN public.account_delay_interest.daily_rate IS 'gunluk_oran';
COMMENT ON COLUMN public.account_delay_interest.interest IS 'faiz';
COMMENT ON COLUMN public.account_delay_interest.bsmv IS 'bsmv';
COMMENT ON COLUMN public.account_delay_interest.kkdf IS 'kkdf';
COMMENT ON COLUMN public.account_delay_interest.total IS 'toplam';
COMMENT ON COLUMN public.account_delay_interest.approved_record IS 'onaylandı';
COMMENT ON COLUMN public.account_delay_interest.approving_person IS 'onaylayan';
COMMENT ON COLUMN public.account_delay_interest.approving_at IS 'onay zamani';
"""