// 德国（EU-DE）辖区适配器
// 法律体系：大陆法系（德国法）
// 主要法律：《民法典》（BGB）《土地登记条例》（GBO）《公证人法》

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

pub struct EuDeAdapter;

impl JurisdictionAdapter for EuDeAdapter {
    fn jurisdiction_code(&self) -> &'static str { "DE" }
    fn jurisdiction_name(&self) -> &'static str { "德意志联邦共和国" }
    fn legal_system(&self) -> LegalSystem { LegalSystem::CivilLaw }

    fn supported_asset_categories(&self) -> Vec<AssetCategorySupport> {
        vec![
            AssetCategorySupport {
                category: "不动产".to_string(),
                supported: true,
                foreign_entity_allowed: true,
                restrictions: Some("须通过公证人（Notar）签署合同，否则合同无效".to_string()),
                required_approvals: vec!["公证人（Notar）".to_string(), "土地登记处（Grundbuchamt）".to_string()],
            },
            AssetCategorySupport {
                category: "证券/股权".to_string(),
                supported: true,
                foreign_entity_allowed: true,
                restrictions: Some("须符合欧盟MiFID II和德国证券法".to_string()),
                required_approvals: vec!["联邦金融监管局（BaFin）".to_string()],
            },
        ]
    }

    fn real_estate_registration_requirements(&self) -> RealEstateRegistrationReq {
        RealEstateRegistrationReq {
            registry_authority: "土地登记处（Grundbuchamt，隶属地方法院）".to_string(),
            notarization_required: true, // 德国法律强制要求公证
            notary_authority: Some("公证人（Notar）——德国公证人是独立的法律职业，非律师".to_string()),
            registration_process: "买卖双方在公证人面前签署公证合同（Notarvertrag）→ 公证人申请预告登记（Auflassungsvormerkung）→ 缴纳土地转让税（GrESt）→ 公证人申请正式产权转移登记（Auflassung）→ 土地登记处完成登记".to_string(),
            foreign_buyer_restrictions: Some("欧盟内无限制；非欧盟买家通常无限制，但部分战略资产可能受审查".to_string()),
            required_documents: vec![
                "公证合同（Notarvertrag）".to_string(),
                "护照/身份证".to_string(),
                "土地转让税完税证明（Unbedenklichkeitsbescheinigung）".to_string(),
                "土地登记摘录（Grundbuchauszug）".to_string(),
                "能源证书（Energieausweis）".to_string(),
                "建筑许可证（如适用）".to_string(),
            ],
            typical_completion_days: 90,
            registration_fee_pct: 0.015, // 公证费+登记费约1.5%-2%
        }
    }

    fn foreign_investment_restrictions(&self) -> ForeignInvestmentRestrictions {
        ForeignInvestmentRestrictions {
            has_fdi_review: true,
            review_authority: Some("联邦经济和气候保护部（BMWK）".to_string()),
            prohibited_sectors: vec![],
            restricted_sectors: vec![
                "关键基础设施（能源/水/电信）".to_string(),
                "国防技术".to_string(),
                "人工智能/量子计算（敏感技术）".to_string(),
                "媒体（部分）".to_string(),
            ],
            real_estate_restrictions: Some("无特殊限制，但涉及关键基础设施附近的不动产可能受审查".to_string()),
            legal_basis: "《对外经济法》（AWG）§55及《对外经济条例》（AWV）".to_string(),
        }
    }

    fn regulatory_bodies(&self) -> Vec<RegulatoryBody> {
        vec![
            RegulatoryBody {
                name: "联邦金融监管局".to_string(),
                abbreviation: "BaFin".to_string(),
                jurisdiction_area: "银行、保险、证券、加密资产监管".to_string(),
                website: Some("https://www.bafin.de".to_string()),
            },
            RegulatoryBody {
                name: "联邦经济和气候保护部".to_string(),
                abbreviation: "BMWK".to_string(),
                jurisdiction_area: "外资审查".to_string(),
                website: Some("https://www.bmwk.de".to_string()),
            },
            RegulatoryBody {
                name: "德国专利商标局".to_string(),
                abbreviation: "DPMA".to_string(),
                jurisdiction_area: "专利、商标、版权".to_string(),
                website: Some("https://www.dpma.de".to_string()),
            },
        ]
    }

    fn asset_transfer_tax_summary(&self) -> AssetTransferTaxSummary {
        AssetTransferTaxSummary {
            real_estate_transfer_tax_buyer: Some(0.065), // GrESt 3.5%-6.5%（各州不同）
            real_estate_transfer_tax_seller: None,
            stamp_duty: None,
            capital_gains_tax_resident: Some(0.25), // 资本利得税 25%（Abgeltungsteuer）
            capital_gains_tax_nonresident: Some(0.25),
            vat_or_gst: Some(0.19), // 增值税 19%（商业交易）
            withholding_tax_dividend: Some(0.25), // 股息预提税 25%
            withholding_tax_interest: Some(0.25),
            withholding_tax_royalty: Some(0.15),
            notes: Some("土地转让税（GrESt）各州3.5%-6.5%；公证费约1%-1.5%；中介费约3%-7%".to_string()),
        }
    }

    fn preferred_dispute_resolution(&self) -> DisputeResolutionPreference {
        DisputeResolutionPreference {
            real_estate: "地方法院/州法院（Amtsgericht/Landgericht）".to_string(),
            goods_trade: "德国仲裁协会（DIS）/ICC".to_string(),
            intellectual_property: "德国联邦专利法院/DIS".to_string(),
            financial: "BaFin调解/DIS/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(_) => {
                ValidationResult::ApprovedWithConditions(vec![
                    "必须通过公证人（Notar）签署公证合同，否则合同无效（BGB §311b）".to_string(),
                    "须在土地登记处（Grundbuchamt）完成产权转移登记".to_string(),
                    "须缴纳土地转让税（GrESt）3.5%-6.5%".to_string(),
                    "须申请预告登记（Auflassungsvormerkung）保护买方权益".to_string(),
                ])
            }
            _ => ValidationResult::Approved,
        }
    }
}