"""每个受保护接口必须映射权限；未登记接口默认拒绝。"""

RESOURCE_MODULES = {
    "base.personnel": "base:personnel", "base.products": "base:products",
    "base.customers": "base:customers", "business.businesses": "business:businesses",
    "business.shipments": "business:shipments", "business.receipts": "business:receipts",
    "business.ratings": "business:ratings", "system.users": "system:users",
    "system.roles": "system:roles", "system.business_roles": "system:business_roles",
    "system.logs": "system:logs", "system.settings": "system:settings",
    "system.monitor": "system:monitor",
}
REPORT_MODULES = {
    "personal-detail": "reports:personal", "department-summary": "reports:department",
    "business-stats": "reports:business", "payment-stats": "reports:payments",
}
PUBLIC_ENDPOINTS = {("auth", "get_captcha"), ("auth", "login"),
                    ("system.settings", "get_settings_public"), ("system.settings", "get_logo_public")}
LOGIN_ENDPOINTS = {("auth", "me"), ("auth", "logout")}


def permission_for(module, name, method, *, params=None, body=None):
    """返回目录操作码；None 表示没有登记，空串仅用于显式登录态接口。"""
    params, body = params or {}, body or {}
    if (module, name) in PUBLIC_ENDPOINTS | LOGIN_ENDPOINTS:
        return ""
    if module == "dashboard":
        return "dashboard:view"
    if module == "system.authorization":
        resource = "system:users" if name in ("user_authorization", "preview", "save_user") else "system:roles"
        return resource + (":view" if method == "GET" or name == "preview" else ":update")
    if module == "metadata":
        return ""  # 此端点按请求的参照资源执行独立的关联功能校验。
    if module == "base.business_roles":
        return ""  # 下拉只返回选项；由端点校验人员查看/维护能力。
    if module in RESOURCE_MODULES:
        resource = RESOURCE_MODULES[module]
        if module == "base.products" and name in ("extraction_preview", "extraction_apply", "restore_source"):
            return resource + (":create" if name == "extraction_apply" else ":update" if name == "restore_source" else ":view")
        if method == "GET":
            return resource + ":view"
        special = {"set_status": "status", "change_status": "status", "reset_password": "password",
                   "replace_regions": "regions", "replace_plans": "plans", "rate_customer": "rating",
                   "change_ownership": "ownership", "upload_logo": "update"}
        action = special.get(name) or {"POST": "create", "PUT": "update", "DELETE": "delete"}.get(method)
        return resource + ":" + action if action else None
    if module == "system.params":
        action = "view" if method == "GET" else {"submit_change": "update", "withdraw_batch": "withdraw", "preview": "preview"}.get(name)
        if name == "export_changes":
            action = "export"
        return "system:params:" + action if action else None
    if module == "system.coefficients":
        return "system:params:" + ({"save": "update", "export": "export", "import_preview": "preview"}.get(name, "view"))
    if module == "system.calc_templates":
        return "system:params:" + ("view" if method == "GET" else "update")
    if module == "system.monitor":
        return "system:monitor:" + ("export" if name == "diagnostic" else "view")
    if module == "system.tplus":
        return "tplus:" + ("view" if method == "GET" else "retry" if name == "retry" else "collect")
    if module == "system.tplus_workbench":
        if name == "work_report":
            return "tplus:export"
        if method == "GET":
            return "tplus:view"
        if name == "save_fact":
            return "tplus:facts"
        if name == "create_work":
            return "tplus:import" if body.get("kind") in ("MASTER_APPLY", "BUSINESS_APPLY") else "tplus:preview"
    if module in ("payroll", "calc"):
        if name == "probation_adjustment":
            return "adjustments:create"
        if name in ("probation_export", "salary_export"):
            return "reports:personal:export"
        if method == "GET":
            return "payroll:view"
        return "adjustments:create" if name == "adjustment" else "payroll:prepare" if name == "save_input" else "payroll:calculate"
    if module == "settlements":
        if name in ("create_adjustment", "list_adjustments"):
            return "adjustments:" + ("view" if method == "GET" else "create")
        return "settlements:" + ("view" if method == "GET" else "generate" if name == "generate" else "submit")
    if module == "system.approvals":
        return "approvals:view"  # 节点动作由服务层根据当前节点检查 finance/leader。
    if module == "reports":
        code = params.get("code") if name == "export_report" else {
            "personal_detail": "personal-detail", "department_summary": "department-summary",
            "business_stats": "business-stats", "payment_stats": "payment-stats",
            "payment_detail": "payment-stats", "payment_day_buckets": "payment-stats",
        }.get(name)
        resource = REPORT_MODULES.get(code)
        return resource + (":export" if name == "export_report" else ":view") if resource else None
    return None