from __future__ import annotations

from app.market.scoring import CustomerSignals


def round_amount(value: float, unit: int) -> float:
    return float(round(value / unit) * unit)


def customer_adjustment_rate(customer: CustomerSignals) -> tuple[float, list[str]]:
    rate = 0.0
    reasons: list[str] = []
    if customer.repeat_purchase_count >= 15:
        rate -= 0.005
        reasons.append("高复购客户优惠0.5%")
    if customer.overdue_days > 0:
        rate += 0.003
        reasons.append("历史逾期风险调整0.3%")
    if customer.reliability_sensitivity >= 0.85:
        rate += 0.008
        reasons.append("高服务可靠性要求溢价0.8%")
    if customer.price_sensitivity >= 0.75:
        rate -= 0.005
        reasons.append("价格敏感客户优惠0.5%")
    return rate, reasons


def build_prices(
    benchmark_amount: float,
    strategy_rate: float,
    solution_type: str,
    customer: CustomerSignals,
    salesperson_adjustment: float,
    supplier_cost: float,
    config: dict,
) -> dict:
    rounding = int(config["quote_rounding"])
    base_recommended = round_amount(benchmark_amount * (1 + strategy_rate), rounding)
    solution_delta = config["solution_price_adjustments"].get(solution_type, 0)
    recommended = base_recommended + solution_delta

    adjustment_rate, adjustment_reasons = customer_adjustment_rate(customer)
    customer_adjustment = round_amount(recommended * adjustment_rate, rounding)
    final_quote = recommended + customer_adjustment + salesperson_adjustment
    allowed_lower = recommended - config["allowed_lower_delta"]
    allowed_upper = recommended + config["allowed_upper_delta"]

    gross_margin_rate = (final_quote - supplier_cost) / final_quote if final_quote else 0
    if gross_margin_rate >= 0.12:
        cost_risk = "利润安全"
    elif gross_margin_rate >= 0.08:
        cost_risk = "利润偏低，建议复核"
    else:
        cost_risk = "低于利润底线，需要审批"

    return {
        "market_benchmark_amount": benchmark_amount,
        "strategy_adjustment_rate": strategy_rate,
        "ai_recommended_amount": recommended,
        "allowed_quote_lower_amount": allowed_lower,
        "allowed_quote_upper_amount": allowed_upper,
        "customer_adjustment_rate": round(adjustment_rate, 4),
        "customer_adjustment_amount": customer_adjustment,
        "salesperson_adjustment_amount": salesperson_adjustment,
        "final_quote_amount": final_quote,
        "currency": "CNY",
        "cost_risk_status": cost_risk,
        "adjustment_reasons": adjustment_reasons,
    }