from decimal import Decimal

LABELS = {
    "en": {
        "cost_report_title": "Capex and Costs {year}",
        "cost_report_subtitle": "{dept} · cost budget: {prior} actual vs. {year} with adjustment",
        "total_across": "Total across {n} categories",
        "by_category": "Budget by category",
        "by_category_sub": "Total cost per category, {prior} vs. {year}",
        "change_by_category": "Change by category",
        "change_by_category_sub": "Percentage change from {prior} actual to {year} with adjustment",
        "change_legend": "Orange = cost increase · Blue = cost reduction",
        "prior_actual": "{prior} actual",
        "adjusted": "{year} with adjustment",
        "base": "{year} without adjustment",
        "change_eur": "Change (€)",
        "change_pct": "Change (%)",
        "cost_lines": "{n} cost lines",
        "cost_line": "1 cost line",
        "summary": "Summary",
        "summary_sub": "All categories, {prior} actual vs. {year} with adjustment",
        "category": "Category",
        "line": "Line",
        "site": "Site",
        "group": "Group",
        "total": "Total",
        "factor": "Factor",
        "reason": "Reason",
        "remarks": "Remarks",
        "budget_title": "Budget {year} · {dept}",
        "budget_sub": "Monthly budget by category",
        "revenue_total": "Sub total revenue",
        "sub_total": "Sub total {name}",
        "total_costs": "Total costs",
        "status": "Status",
        "exported": "Exported",
        "draft": "Draft",
        "in_review": "In review",
        "approved": "Approved",
        "inputs": "Inputs",
        "months": ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
        "no_data": "No cost lines yet.",
        "site_filter": "Site: {site}",
    },
    "pt": {
        "cost_report_title": "Capex e Custos para {year}",
        "cost_report_subtitle": "{dept} · orçamento de custos: real {prior} vs. {year} com ajuste",
        "total_across": "Total de {n} categorias",
        "by_category": "Orçamento por categoria",
        "by_category_sub": "Custo total por categoria, {prior} vs. {year}",
        "change_by_category": "Variação por categoria",
        "change_by_category_sub": "Variação percentual do real {prior} para {year} com ajuste",
        "change_legend": "Laranja = aumento de custo · Azul = redução de custo",
        "prior_actual": "{prior} real",
        "adjusted": "{year} com ajuste",
        "base": "{year} sem ajuste",
        "change_eur": "Variação (€)",
        "change_pct": "Variação (%)",
        "cost_lines": "{n} linhas de custo",
        "cost_line": "1 linha de custo",
        "summary": "Resumo",
        "summary_sub": "Todas as categorias, real {prior} vs. {year} com ajuste",
        "category": "Categoria",
        "line": "Linha",
        "site": "Unidade",
        "group": "Grupo",
        "total": "Total",
        "factor": "Fator",
        "reason": "Motivo",
        "remarks": "Observações",
        "budget_title": "Orçamento {year} · {dept}",
        "budget_sub": "Orçamento mensal por categoria",
        "revenue_total": "Subtotal receitas",
        "sub_total": "Subtotal {name}",
        "total_costs": "Total de custos",
        "status": "Estado",
        "exported": "Exportado",
        "draft": "Rascunho",
        "in_review": "Em revisão",
        "approved": "Aprovado",
        "inputs": "Dados",
        "months": ["Jan", "Fev", "Mar", "Abr", "Mai", "Jun", "Jul", "Ago", "Set", "Out", "Nov", "Dez"],
        "no_data": "Ainda não há linhas de custo.",
        "site_filter": "Unidade: {site}",
    },
}


class T:
    def __init__(self, lang: str, year: int, dept: str = ""):
        self.lang = lang if lang in LABELS else "pt"
        self.labels = LABELS[self.lang]
        self.ctx = {"year": year, "prior": year - 1, "dept": dept}

    def __call__(self, key: str, **kw):
        value = self.labels[key]
        return value.format(**{**self.ctx, **kw}) if isinstance(value, str) else value

    def _group(self, value: Decimal, decimals: int) -> str:
        q = Decimal(1).scaleb(-decimals) if decimals else Decimal(1)
        text = f"{abs(Decimal(value)).quantize(q):,.{decimals}f}"
        whole, _, frac = text.partition(".")
        whole = whole.replace(",", " ")
        if not frac:
            return whole
        return whole + ("," if self.lang == "pt" else ".") + frac

    def eur(self, value, decimals: int = 2, signed: bool = False) -> str:
        value = Decimal(value or 0)
        sign = ("+" if value > 0 else "−" if value < 0 else "") if signed else ("−" if value < 0 else "")
        body = self._group(value, decimals)
        return f"{sign}{body} €" if self.lang == "pt" else f"{sign}€{body}"

    def num(self, value, decimals: int = 2) -> str:
        value = Decimal(value or 0)
        return ("\u2212" if value < 0 else "") + self._group(value, decimals)

    def pct(self, value, signed: bool = True) -> str:
        if value is None:
            return "—"
        value = Decimal(value)
        sign = ("+" if value > 0 else "−" if value < 0 else "") if signed else ""
        return f"{sign}{self._group(value, 2)}%"

    def short_eur(self, value: float) -> str:
        v = abs(value)
        sign = "−" if value < 0 else ""
        if v >= 1_000_000:
            body = f"{v / 1_000_000:g}M"
        elif v >= 1000:
            body = f"{v / 1000:g}k"
        else:
            body = f"{v:g}"
        if self.lang == "pt":
            return f"{sign}{body.replace('.', ',')} €"
        return f"{sign}€{body}"