from __future__ import annotations

from dataclasses import dataclass
from datetime import date
from decimal import Decimal, InvalidOperation
from pathlib import Path
from typing import Iterable

import jdatetime
from arabic_reshaper import reshape
from bidi.algorithm import get_display

PERSIAN_DIGITS = str.maketrans("0123456789", "۰۱۲۳۴۵۶۷۸۹")
ARABIC_RANGES = (
    (0x0600, 0x06FF),
    (0x0750, 0x077F),
    (0x08A0, 0x08FF),
    (0xFB50, 0xFDFF),
    (0xFE70, 0xFEFF),
)


TRANSLATIONS = {
    "en": {
        "report_title": "Workspace Report",
        "overall_sheet": "Overall Report",
        "workspace": "Workspace",
        "period": "Period",
        "from_date": "From date",
        "to_date": "To date",
        "user": "User",
        "mobile": "Mobile",
        "all_users": "All users",
        "generated_at": "Generated at",
        "summary": "Summary",
        "total_hours": "Total hours",
        "billable_hours": "Billable hours",
        "non_billable_hours": "Non-billable hours",
        "hourly_rate": "Hourly rate",
        "income": "Income",
        "daily_summary": "Daily Summary",
        "clients": "Clients",
        "projects": "Projects",
        "tags": "Tags",
        "date": "Date",
        "name": "Name",
        "total": "Total",
        "no_data": "No data",
    },
    "fa": {
        "report_title": "گزارش فضای کاری",
        "overall_sheet": "گزارش کلی",
        "workspace": "فضای کاری",
        "period": "بازه",
        "from_date": "از تاریخ",
        "to_date": "تا تاریخ",
        "user": "کاربر",
        "mobile": "موبایل",
        "all_users": "همه کاربران",
        "generated_at": "تاریخ تولید",
        "summary": "خلاصه",
        "total_hours": "کل ساعات",
        "billable_hours": "ساعات کاری",
        "non_billable_hours": "ساعات غیر کاری",
        "hourly_rate": "نرخ ساعتی",
        "income": "درآمد",
        "daily_summary": "خلاصه روزانه",
        "clients": "مشتریان",
        "projects": "پروژه‌ها",
        "tags": "تگ‌ها",
        "date": "تاریخ",
        "name": "نام",
        "total": "جمع",
        "no_data": "بدون داده",
    },
}

PERIOD_LABELS = {
    "en": {
        "this_week": "This week",
        "this_month": "This month",
        "this_year": "This year",
        "half_year_first": "First half of year",
        "half_year_second": "Second half of year",
        "period": "Custom period",
    },
    "fa": {
        "this_week": "این هفته",
        "this_month": "این ماه",
        "this_year": "امسال",
        "half_year_first": "نیمه اول سال",
        "half_year_second": "نیمه دوم سال",
        "period": "بازه دلخواه",
    },
}

CURRENCY_LABELS = {
    "USD": {"en": "USD", "fa": "دلار آمریکا"},
    "EUR": {"en": "EUR", "fa": "یورو"},
    "GBP": {"en": "GBP", "fa": "پوند"},
    "IRR": {"en": "IRR", "fa": "ریال"},
    "IRT": {"en": "IRT", "fa": "تومان"},
    "AED": {"en": "AED", "fa": "درهم"},
    "TRY": {"en": "TRY", "fa": "لیر"},
}


@dataclass(frozen=True)
class ExportLocale:
    language: str
    is_rtl: bool
    font_regular: str
    font_bold: str

    def t(self, key: str) -> str:
        return TRANSLATIONS[self.language][key]

    def period_label(self, period: str) -> str:
        return PERIOD_LABELS[self.language].get(period, period)

    def format_number(self, value: object, *, ascii_digits: bool = False) -> str:
        text = str(value)
        if self.language == "fa" and not ascii_digits:
            return text.translate(PERSIAN_DIGITS)
        return text

    def format_date(self, value: date | str | None, *, ascii_digits: bool = False) -> str:
        if value is None:
            return "-"
        if isinstance(value, str):
            value = date.fromisoformat(value)
        if self.language == "fa":
            jalali = jdatetime.date.fromgregorian(date=value)
            return self.format_number(jalali.strftime("%Y/%m/%d"), ascii_digits=ascii_digits)
        return value.strftime("%Y/%m/%d")

    def format_duration(self, value: str, *, ascii_digits: bool = False) -> str:
        return self.format_number(value, ascii_digits=ascii_digits)

    def format_amount(self, value: object, *, ascii_digits: bool = False) -> str:
        raw = str(value).strip()
        if not raw:
            return raw
        try:
            decimal_value = Decimal(raw)
        except InvalidOperation:
            return self.format_number(raw, ascii_digits=ascii_digits)

        sign = "-" if decimal_value < 0 else ""
        unsigned = abs(decimal_value)
        normalized = format(unsigned, "f")
        integer_part, _, fractional_part = normalized.partition(".")
        grouped_integer = f"{int(integer_part):,}"
        formatted = f"{sign}{grouped_integer}"
        if fractional_part:
            trimmed_fraction = fractional_part.rstrip("0")
            if trimmed_fraction:
                formatted = f"{formatted}.{trimmed_fraction}"
        return self.format_number(formatted, ascii_digits=ascii_digits)

    def format_money_label(self, income_totals: list[dict], *, ascii_digits: bool = False) -> str:
        if not income_totals:
            return "-"
        parts = []
        for item in income_totals:
            currency = self.currency_label(item["currency"])
            parts.append(f"{self.format_amount(item['amount'], ascii_digits=ascii_digits)} {currency}")
        return " | ".join(parts)

    def currency_label(self, code: str | None) -> str:
        raw = str(code or "").upper()
        return CURRENCY_LABELS.get(raw, {}).get(self.language, raw)

    def shape(self, text: object) -> str:
        raw = str(text)
        if not any(start <= ord(char) <= end for char in raw for start, end in ARABIC_RANGES):
            return raw
        return get_display(reshape(raw))


def build_export_locale(language: str | None) -> ExportLocale:
    resolved = language if language in {"en", "fa"} else "en"
    assets_dir = Path(__file__).resolve().parent.parent / "assets" / "fonts"
    return ExportLocale(
        language=resolved,
        is_rtl=resolved == "fa",
        font_regular=str(assets_dir / "Vazirmatn-Regular.ttf"),
        font_bold=str(assets_dir / "Vazirmatn-Bold.ttf"),
    )


def user_label(user_payload: dict | None, locale: ExportLocale, *, ascii_digits: bool = False) -> str:
    if not user_payload:
        return locale.t("all_users")
    mobile = locale.format_number(user_payload.get("mobile") or "", ascii_digits=ascii_digits)
    if mobile:
        return f"{user_payload['name']} - {mobile}"
    return str(user_payload["name"])


def safe_sheet_title(title: str, used: Iterable[str]) -> str:
    invalid = set('[]:*?/\\')
    sanitized = "".join("-" if char in invalid else char for char in title).strip() or "Sheet"
    base = sanitized[:31]
    used_set = set(used)
    if base not in used_set:
        return base
    index = 2
    while True:
        suffix = f"-{index}"
        candidate = f"{sanitized[:31 - len(suffix)]}{suffix}"
        if candidate not in used_set:
            return candidate
        index += 1