"""验证模块 — 数据完整性和导出就绪检查。"""
from dataclasses import dataclass, field
from typing import Optional


@dataclass
class FormalDeckIssue:
    code: str
    level: str  # "error" | "warn"
    message: str
    path: str = ""  # 字段路径，如 "insured.age"、"benefitRows[5].totalSurrenderValue"
    section: str = ""  # 分区：fields、benefitRows、withdrawalRows、coverageItems、indexAccounts
    suggested_action: str = ""  # fill_or_confirm | modify | review | none


@dataclass
class ValidationIssue:
    field: str
    message: str
    level: str  # "error" | "warn"


def _is_continuous(rows: list[dict]) -> bool:
    """检查保单年度是否连续。"""
    years = sorted(r.get("policyYear", 0) for r in rows if isinstance(r, dict))
    for i in range(1, len(years)):
        if years[i] != years[i - 1] + 1:
            return False
    return True


def _has_sufficient_milestone_coverage(rows: list[dict]) -> bool:
    """判断非连续利益表是否覆盖正式方案所需的关键年度。"""
    years = {
        int(r.get("policyYear", 0))
        for r in rows
        if isinstance(r, dict) and _safe_number(r.get("policyYear")) > 0
    }
    return len(years) >= 5 and {10, 20, 30}.issubset(years) and max(years) >= 30


def validate_formal_savings_plan(plan: dict) -> list[FormalDeckIssue]:
    """验证归一化储蓄险数据的导出就绪性。"""
    issues = []

    def err(code, msg, path="", section="fields", suggested_action="review"):
        issues.append(FormalDeckIssue(code, "error", msg, path=path, section=section, suggested_action=suggested_action))

    def warn(code, msg, path="", section="fields", suggested_action="review"):
        issues.append(FormalDeckIssue(code, "warn", msg, path=path, section=section, suggested_action=suggested_action))

    if not plan.get("productName"):
        err("PRODUCT_NAME_MISSING", "产品名称缺失", path="productName", suggested_action="fill_or_confirm")

    insured = plan.get("insured", {})
    if not insured.get("age"):
        err("INSURED_AGE_MISSING", "被保险人年龄缺失", path="insured.age", suggested_action="fill_or_confirm")
    if insured.get("smoker") not in ("yes", "no"):
        warn("SMOKER_STATUS_UNKNOWN", "吸烟状态未知，请核对计划书", path="insured.smoker")

    policy = plan.get("policy", {})
    if not policy.get("currency"):
        err("CURRENCY_MISSING", "币种缺失", path="policy.currency", suggested_action="fill_or_confirm")
    if _safe_number(policy.get("annualPremium")) <= 0:
        err("ANNUAL_PREMIUM_INVALID", "年缴保费必须大于 0", path="policy.annualPremium", suggested_action="fill_or_confirm")
    if _safe_number(policy.get("payYears")) <= 0:
        err("PAY_YEARS_INVALID", "缴费年期必须大于 0", path="policy.payYears", suggested_action="fill_or_confirm")

    benefit_rows = plan.get("benefitRows", [])
    if len(benefit_rows) < 20:
        if _has_sufficient_milestone_coverage(benefit_rows):
            warn(
                "BENEFIT_ROWS_MILESTONE_ONLY",
                f"利益演示仅提供里程碑年度（当前 {len(benefit_rows)} 行），已覆盖 10、20、30 年，可继续生成",
                path="benefitRows", section="benefitRows",
            )
        else:
            warn(
                "BENEFIT_ROWS_INCOMPLETE",
                f"利益演示数据不足（当前 {len(benefit_rows)} 行，且未覆盖 10、20、30 年）",
                path="benefitRows", section="benefitRows",
            )
    if benefit_rows and not _is_continuous(benefit_rows):
        warn(
            "BENEFIT_ROWS_DISCONTINUOUS",
            "利益演示采用里程碑年度，保单年度不连续，请在生成前核对关键年份",
            path="benefitRows", section="benefitRows",
        )

    source = plan.get("source", {})
    if not source.get("pdfHash"):
        err("SOURCE_HASH_MISSING", "缺少 PDF 哈希（来源追溯）", path="source.pdfHash")

    if not any(r.get("sourcePage") for r in benefit_rows):
        warn("BENEFIT_SOURCE_PAGE_MISSING", "利益演示缺少来源页码",
             path="benefitRows", section="benefitRows")

    withdrawal_rows = plan.get("withdrawalRows", [])
    if withdrawal_rows and not _is_continuous(withdrawal_rows):
        warn("WITHDRAWAL_ROWS_DISCONTINUOUS", "提领方案保单年度不连续",
             path="withdrawalRows", section="withdrawalRows")
    if withdrawal_rows and not any(r.get("sourcePage") for r in withdrawal_rows):
        warn("WITHDRAWAL_SOURCE_PAGE_MISSING", "提领方案缺少来源页码",
             path="withdrawalRows", section="withdrawalRows")

    # 检查 total_surrender_value >= guaranteed_cash_value 一致性
    for i, row in enumerate(benefit_rows):
        gcv = _safe_number(row.get("guaranteedCashValue"))
        rev = _safe_number(row.get("reversionaryBonus"))
        term = _safe_number(row.get("terminalDividend"))
        total = _safe_number(row.get("totalSurrenderValue"))
        if total > 0 and gcv > 0 and total < gcv:
            year = row.get("policyYear", "?")
            expected = gcv + rev + term
            warn(
                "TOTAL_SURRENDER_VALUE_INCONSISTENT",
                f"第 {year} 年总退保价值({total})低于保证现金价值({gcv})，"
                f"应为 {expected}，请核对数据是否列错位",
                path=f"benefitRows[{i}].totalSurrenderValue", section="benefitRows",
            )

    return issues


def validate_formal_ci_plan(plan: dict) -> list[FormalDeckIssue]:
    """验证归一化重疾险数据。"""
    issues = []

    def err(code, msg):
        issues.append(FormalDeckIssue(code, "error", msg))

    def warn(code, msg):
        issues.append(FormalDeckIssue(code, "warn", msg))

    if not plan.get("productName"):
        err("CI_PRODUCT_NAME_MISSING", "产品名称缺失")
    if not plan.get("insured", {}).get("age"):
        err("CI_INSURED_AGE_MISSING", "被保险人年龄缺失")
    if plan.get("insured", {}).get("smoker") not in ("yes", "no"):
        warn("CI_SMOKER_STATUS_UNKNOWN", "吸烟状态未知，请核对计划书")
    if not plan.get("policy", {}).get("currency"):
        err("CI_CURRENCY_MISSING", "币种缺失")
    if _safe_number(plan.get("policy", {}).get("sumInsured")) <= 0:
        err("CI_SUM_INSURED_INVALID", "保额必须大于 0")
    if _safe_number(plan.get("policy", {}).get("annualPremium")) <= 0:
        err("CI_ANNUAL_PREMIUM_INVALID", "年缴保费必须大于 0")
    if _safe_number(plan.get("policy", {}).get("payYears")) <= 0:
        err("CI_PAY_YEARS_INVALID", "缴费年期必须大于 0")
    if not plan.get("coverageItems"):
        warn("CI_COVERAGE_ITEMS_MISSING", "保障项目列表为空，相关页面将隐藏")

    return issues


def validate_formal_iul_plan(plan: dict) -> list[FormalDeckIssue]:
    """验证归一化 IUL 数据。"""
    issues = []

    def err(code, msg):
        issues.append(FormalDeckIssue(code, "error", msg))

    def warn(code, msg):
        issues.append(FormalDeckIssue(code, "warn", msg))

    if not plan.get("productName"):
        err("IUL_PRODUCT_NAME_MISSING", "产品名称缺失")
    if not plan.get("insured", {}).get("age"):
        err("IUL_INSURED_AGE_MISSING", "被保险人年龄缺失")
    if plan.get("insured", {}).get("smoker") not in ("yes", "no"):
        warn("IUL_SMOKER_STATUS_UNKNOWN", "吸烟状态未知，请核对计划书")
    policy = plan.get("policy", {})
    if not policy.get("currency"):
        err("IUL_CURRENCY_MISSING", "币种缺失")
    if _safe_number(plan.get("policy", {}).get("sumInsured")) <= 0:
        err("IUL_SUM_INSURED_INVALID", "保额必须大于 0")
    if max(
        _safe_number(policy.get("targetPremium")),
        _safe_number(policy.get("annualPremium")),
        _safe_number(policy.get("initialPremium")),
    ) <= 0:
        err("IUL_PREMIUM_INVALID", "目标保费、计划保费或首期保费至少填写一项")
    if not plan.get("indexAccounts"):
        warn("IUL_INDEX_ACCOUNT_MISSING", "指数账户配置为空，相关页面将隐藏")

    benefit_rows = plan.get("benefitRows", [])
    if len(benefit_rows) < 20:
        warn("IUL_BENEFIT_ROWS_INCOMPLETE", f"利益演示行数不足（当前 {len(benefit_rows)} 行），可继续生成")
    is_continuous = _is_continuous(benefit_rows) if benefit_rows else True
    if benefit_rows and not is_continuous:
        warn("IUL_BENEFIT_ROWS_DISCONTINUOUS", "利益演示保单年度不连续，请确认 PDF 是否只提供里程碑年度")

    source = plan.get("source", {})
    if not source.get("pdfHash"):
        err("IUL_SOURCE_HASH_MISSING", "缺少 PDF 哈希")

    if benefit_rows and not any(r.get("sourcePage") for r in benefit_rows):
        warn("IUL_SOURCE_PAGE_MISSING", "利益演示缺少来源页码")

    annual_premium = _safe_number(policy.get("annualPremium"))
    positive_surrender = [
        _safe_number(row.get("totalSurrenderValue"))
        for row in benefit_rows
        if _safe_number(row.get("totalSurrenderValue")) > 0
    ]
    if annual_premium > 0 and len(positive_surrender) >= 3:
        tiny_values = [value for value in positive_surrender if value < annual_premium * 0.01]
        if len(tiny_values) / len(positive_surrender) >= 0.6:
            err(
                "IUL_BENEFIT_VALUE_IMPLAUSIBLE",
                "多数退保价值不足年缴保费的 1%，疑似把年龄、页码或百分比识别为金额，请核对利益表",
            )

    # 缴费年期一致性检查
    payment_period = plan.get("policy", {}).get("paymentPeriod", "")
    if benefit_rows and payment_period and is_continuous:
        # 通过数据检测实际缴费年数
        detected_years = 0
        for i in range(1, len(benefit_rows)):
            prev = _safe_number(benefit_rows[i - 1].get("totalPremiumPaid"))
            curr = _safe_number(benefit_rows[i].get("totalPremiumPaid"))
            if curr > prev:
                detected_years += 1
        # 解析声明的缴费年期
        stated_years = _extract_years(payment_period)
        if stated_years > 0 and detected_years > 0 and abs(detected_years - stated_years) > 1:
            err("IUL_PAY_TERM_MISMATCH", f"缴费年期不一致：声明 {stated_years} 年，数据检测 {detected_years} 年")

    # 年龄合理性检查
    insured_age = _safe_number(plan.get("insured", {}).get("age"))
    for row in benefit_rows:
        if isinstance(row, dict):
            age = _safe_number(row.get("age"))
            if age > 0 and (age < 0 or age > 150):
                err("IUL_AGE_OUT_OF_RANGE", f"年龄超出合理范围: {age}")
                break
            policy_year = _safe_number(row.get("policyYear"))
            expected_age = insured_age + policy_year - 1
            if age > 0 and insured_age > 0 and policy_year > 0 and abs(age - expected_age) > 1:
                err(
                    "IUL_AGE_YEAR_MISMATCH",
                    f"第 {int(policy_year)} 保单年度年龄应约为 {int(expected_age)}，实际为 {int(age)}",
                )
                break

    return issues


def validate_savings_metrics(metrics: dict) -> list[ValidationIssue]:
    """验证储蓄险关键指标。"""
    issues = []

    if not metrics.get("productName"):
        issues.append(ValidationIssue("productName", "产品名称缺失", "error"))
    if _safe_number(metrics.get("insuredAge")) <= 0:
        issues.append(ValidationIssue("insuredAge", "被保险人年龄无效", "error"))
    if not metrics.get("currency"):
        issues.append(ValidationIssue("currency", "货币缺失", "error"))
    if _safe_number(metrics.get("annualPremium")) <= 0:
        issues.append(ValidationIssue("annualPremium", "年缴保费无效", "error"))
    if _safe_number(metrics.get("payYears")) <= 0:
        issues.append(ValidationIssue("payYears", "缴费年期无效", "error"))
    if metrics.get("multiple20") is None:
        issues.append(ValidationIssue("multiple20", "20年倍数缺失", "warn"))
    if metrics.get("multiple30") is None:
        issues.append(ValidationIssue("multiple30", "30年倍数缺失", "warn"))
    if metrics.get("breakevenYear") is None:
        issues.append(ValidationIssue("breakevenYear", "回本年度缺失", "warn"))

    return issues


def _safe_number(value) -> float:
    if value is None:
        return 0
    try:
        return float(value)
    except (ValueError, TypeError):
        return 0


def _extract_years(value) -> int:
    import re
    if value is None:
        return 0
    match = re.search(r"\d+(?:\.\d+)?", str(value))
    return int(float(match.group())) if match else 0