// 香港（HK）辖区适配器
// 法律体系：普通法系（英美法系）
// 主要法律：《土地注册条例》《印花税条例》《公司条例》《证券及期货条例》

use crate::{
    AssetCategorySupport, AssetTransferTaxSummary, DisputeResolutionPreference,
    ForeignInvestmentRestrictions, JurisdictionAdapter, RealEstateRegistrationReq,
    RegulatoryBody, ValidationResult,
};
use nac_rwa_legal_model::{AssetCategory, LegalSystem};

pub struct HkAdapter;

impl JurisdictionAdapter for HkAdapter {
    fn jurisdiction_code(&self) -> &'static str { "HK" }
    fn jurisdiction_name(&self) -> &'static str { "中国香港特别行政区" }
    fn legal_system(&self) -> LegalSystem { LegalSystem::CommonLaw }

    fn supported_asset_categories(&self) -> Vec<AssetCategorySupport> {
        vec![
            AssetCategorySupport {
                category: "不动产（住宅/商业/工业）".to_string(),
                supported: true,
                foreign_entity_allowed: true,
                restrictions: Some("外资可自由购买，但需缴纳额外印花税（BSD 15%）".to_string()),
                required_approvals: vec!["土地注册处".to_string()],
            },
            AssetCategorySupport {
                category: "证券/股权".to_string(),
                supported: true,
                foreign_entity_allowed: true,
                restrictions: None,
                required_approvals: vec!["香港证监会（SFC）".to_string()],
            },
            AssetCategorySupport {
                category: "虚拟资产（合规）".to_string(),
                supported: true,
                foreign_entity_allowed: true,
                restrictions: Some("须持有SFC颁发的虚拟资产服务提供商（VASP）牌照".to_string()),
                required_approvals: vec!["香港证监会（SFC）VASP牌照".to_string()],
            },
        ]
    }

    fn real_estate_registration_requirements(&self) -> RealEstateRegistrationReq {
        RealEstateRegistrationReq {
            registry_authority: "土地注册处（Land Registry）".to_string(),
            notarization_required: false,
            notary_authority: None,
            registration_process: "签订临时买卖合约（PASP）→ 签订正式买卖合约（ASP）→ 缴纳印花税 → 完成交割 → 在土地注册处登记".to_string(),
            foreign_buyer_restrictions: Some("外资买家须缴纳买家印花税（BSD）15%，加上从价印花税（AVD）最高15%".to_string()),
            required_documents: vec![
                "临时买卖合约（PASP）".to_string(),
                "正式买卖合约（ASP）".to_string(),
                "身份证/护照".to_string(),
                "印花税缴纳证明".to_string(),
                "按揭文件（如适用）".to_string(),
                "律师行转让契（Assignment）".to_string(),
            ],
            typical_completion_days: 60,
            registration_fee_pct: 0.001,
        }
    }

    fn foreign_investment_restrictions(&self) -> ForeignInvestmentRestrictions {
        ForeignInvestmentRestrictions {
            has_fdi_review: false,
            review_authority: None,
            prohibited_sectors: vec![],
            restricted_sectors: vec![
                "广播（须持牌）".to_string(),
                "电讯（须持牌）".to_string(),
            ],
            real_estate_restrictions: Some("外资可自由购买，但须缴纳买家印花税（BSD）15%".to_string()),
            legal_basis: "香港基本法保障自由贸易和资本自由流动".to_string(),
        }
    }

    fn regulatory_bodies(&self) -> Vec<RegulatoryBody> {
        vec![
            RegulatoryBody {
                name: "香港证券及期货事务监察委员会".to_string(),
                abbreviation: "SFC".to_string(),
                jurisdiction_area: "证券、期货、虚拟资产监管".to_string(),
                website: Some("https://www.sfc.hk".to_string()),
            },
            RegulatoryBody {
                name: "香港金融管理局".to_string(),
                abbreviation: "HKMA".to_string(),
                jurisdiction_area: "银行监管、货币政策".to_string(),
                website: Some("https://www.hkma.gov.hk".to_string()),
            },
            RegulatoryBody {
                name: "土地注册处".to_string(),
                abbreviation: "LR".to_string(),
                jurisdiction_area: "不动产登记".to_string(),
                website: Some("https://www.landreg.gov.hk".to_string()),
            },
            RegulatoryBody {
                name: "税务局".to_string(),
                abbreviation: "IRD".to_string(),
                jurisdiction_area: "税收征管".to_string(),
                website: Some("https://www.ird.gov.hk".to_string()),
            },
        ]
    }

    fn asset_transfer_tax_summary(&self) -> AssetTransferTaxSummary {
        AssetTransferTaxSummary {
            real_estate_transfer_tax_buyer: Some(0.15), // AVD 最高 15%
            real_estate_transfer_tax_seller: None, // 无卖方印花税（SSD 已于2023年取消）
            stamp_duty: Some(0.15), // BSD（外资买家）15%
            capital_gains_tax_resident: None, // 香港无资本利得税
            capital_gains_tax_nonresident: None,
            vat_or_gst: None, // 香港无增值税/消费税
            withholding_tax_dividend: None, // 香港无股息预提税
            withholding_tax_interest: None,
            withholding_tax_royalty: Some(0.045), // 特许权使用费预提税 4.5%（非居民）
            notes: Some("外资买家须缴纳BSD 15%+AVD最高15%=合计最高30%；香港无资本利得税和增值税".to_string()),
        }
    }

    fn preferred_dispute_resolution(&self) -> DisputeResolutionPreference {
        DisputeResolutionPreference {
            real_estate: "香港高等法院原讼法庭".to_string(),
            goods_trade: "香港国际仲裁中心（HKIAC）".to_string(),
            intellectual_property: "香港知识产权法院/HKIAC".to_string(),
            financial: "HKIAC/香港高等法院".to_string(),
            new_york_convention_member: true,
        }
    }

    fn validate_asset_for_tokenization(
        &self,
        asset: &AssetCategory,
        is_foreign_entity: bool,
    ) -> ValidationResult {
        match asset {
            AssetCategory::RealEstate(_) => {
                if is_foreign_entity {
                    ValidationResult::ApprovedWithConditions(vec![
                        "须缴纳买家印花税（BSD）15%".to_string(),
                        "须缴纳从价印花税（AVD）最高15%".to_string(),
                        "须通过持牌律师行完成转让".to_string(),
                    ])
                } else {
                    ValidationResult::ApprovedWithConditions(vec![
                        "须缴纳从价印花税（AVD）".to_string(),
                        "须在土地注册处完成登记".to_string(),
                    ])
                }
            }
            AssetCategory::DigitalAsset(_) => {
                ValidationResult::ApprovedWithConditions(vec![
                    "须持有SFC颁发的VASP牌照".to_string(),
                    "须符合SFC虚拟资产监管框架".to_string(),
                ])
            }
            _ => ValidationResult::Approved,
        }
    }
}