import { SAML, ValidateInResponseTo } from "@node-saml/node-saml";
import {
  getIDPMetadata,
  normalizeCertificate,
} from "@/lib/saml/idp-metadata";
import {
  getSPMetadata,
} from "@/lib/saml/sp-metadata";
import { debugLog, debugError, debugSuccess, debugProcess, debugMock } from '@/lib/debug-utils';

export interface SAMLProfile {
  nameID?: string;
  nameIDFormat?: string;
  attributes?: Record<string, string | string[]>; // 문자열 또는 배열 모두 지원
  [key: string]: unknown;
}

export interface SAMLUser {
  id: string;
  email: string;
  name: string;
  companyId?: number;
  techCompanyId?: number;
  domain?: string;
}

// SAML 설정 생성 (sync 함수) - 환경변수 기반으로 변경했음
export function createSAMLConfig() {
  console.log("⚙️ Creating SAML configuration...");

  try {
    const idpMetadata = getIDPMetadata();
    const spMetadata = getSPMetadata();
    
    console.log("📋 IdP Metadata loaded:", {
      entityId: idpMetadata.entityId,
      ssoUrl: idpMetadata.ssoUrl,
      organization: idpMetadata.organization,
      wantAuthnRequestsSigned: idpMetadata.wantAuthnRequestsSigned,
    });

    console.log("📋 SP Metadata loaded:", {
      entityId: spMetadata.entityId,
      callbackUrl: spMetadata.callbackUrl,
      authnRequestsSigned: spMetadata.authnRequestsSigned,
    });

    const config = {
      callbackUrl: spMetadata.callbackUrl,
      // IDP 메타데이터 기반 설정
      entryPoint: idpMetadata.ssoUrl,
      // SP Entity ID
      issuer: spMetadata.entityId,
      // IDP 인증서 (정규화된 PEM 형식)
      idpCert: normalizeCertificate(idpMetadata.certificate),
      privateKey: process.env.SAML_SP_PRIVATE_KEY,
      // IdP에서 요구하는 설정
      identifierFormat: idpMetadata.nameIdFormat,
      signatureAlgorithm: "sha256" as const,
      digestAlgorithm: "sha256",
      // SP 메타데이터 설정
          decryptionPvk: process.env.SAML_SP_PRIVATE_KEY,
    publicCert: process.env.SAML_SP_CERT,
      // IdP 메타데이터 기반 설정
      wantAuthnResponseSigned: idpMetadata.wantAuthnRequestsSigned,
      wantAssertionsSigned: spMetadata.wantAssertionsSigned,
      validateInResponseTo: ValidateInResponseTo.never,
      disableRequestedAuthnContext: true,
      // HTTP-Redirect 바인딩 설정
      authnRequestBinding: undefined, // HTTP-Redirect (GET) 사용 (기본값)
      skipRequestCompression: false, // Deflate 압축 사용
      // 추가 보안 설정
      acceptedClockSkewMs: 5000, // 5초 클럭 차이 허용
      forceAuthn: false,
      // IDP Entity ID 설정
      idpIssuer: idpMetadata.entityId,
    };

    console.log("✅ SAML Config created:", {
      callbackUrl: config.callbackUrl,
      entryPoint: config.entryPoint,
      issuer: config.issuer,
      idpIssuer: config.idpIssuer,
      identifierFormat: config.identifierFormat,
      hasIdpCert: !!config.idpCert,
      hasPrivateKey: !!config.privateKey,
      hasPublicCert: !!config.publicCert,
      wantAuthnResponseSigned: config.wantAuthnResponseSigned,
      wantAssertionsSigned: config.wantAssertionsSigned,
    });

    return config;
  } catch (error) {
    console.error("💥 Failed to create SAML Config:", error);
    throw error;
  }
}

// SAML AuthnRequest 생성 (서버 액션)
export async function createAuthnRequest(relayState?: string): Promise<string> {
  "use server";

  console.log("SSO STEP 2: Create AuthnRequest", { relayState });
  
  // Mock IdP 모드 체크
  if (process.env.SAML_MOCKING_IDP === 'true') {
    debugMock("Mock IdP mode enabled - simulating SAML response");
    return createMockSAMLFlow(relayState);
  }

  try {
    const config = createSAMLConfig();
    console.log("SAML Config ready for AuthnRequest generation");

    const saml = new SAML(config);
    console.log("SAML instance created, generating authorize URL...");

    const startTime = Date.now();
    const authorizeUrl = await saml.getAuthorizeUrlAsync(
      relayState || "", // RelayState - 원래 가려던 페이지
      undefined, // host
      {
        additionalParams: {},
        // additionalAuthorizeParams: {},
      }
    );
    const endTime = Date.now();

    // 🔍 SAML AuthnRequest 디코딩 및 분석
    try {
      const urlObj = new URL(authorizeUrl);
      const samlRequest = urlObj.searchParams.get("SAMLRequest");

      if (samlRequest) {
        console.log("SAML AuthnRequest 분석:");
        console.log("1️⃣ 원본 URL:", authorizeUrl);
        console.log(
          "2️⃣ URL 디코딩된 SAMLRequest:",
          decodeURIComponent(samlRequest)
        );

        try {
          // Base64 디코딩
          const base64DecodedBuffer = Buffer.from(
            decodeURIComponent(samlRequest),
            "base64"
          );
          const base64DecodedString = base64DecodedBuffer.toString("utf-8");

          // XML인지 확인 (XML은 '<'로 시작함)
          if (base64DecodedString.trim().startsWith("<")) {
            console.log("Base64 디코딩된 XML (압축 없음):");
            console.log("───────────────────────────────────");
            console.log(base64DecodedString);
            console.log("───────────────────────────────────");

            // XML 구조 분석
            const xmlLines = base64DecodedString
              .split("\n")
              .filter((line) => line.trim());
            console.log("XML 구조 요약:");
            xmlLines.forEach((line, index) => {
              const trimmed = line.trim();
              if (
                trimmed.includes("<saml") ||
                trimmed.includes("<samlp") ||
                trimmed.includes("ID=") ||
                trimmed.includes("Destination=")
              ) {
                console.log(`   ${index + 1}: ${trimmed}`);
              }
            });
          } else {
            // XML이 아니면 Deflate 압축된 것으로 간주
            console.log(
              "3️⃣ 압축된 바이너리 데이터 감지, Deflate 압축 해제 시도..."
            );

            try {
              const zlib = await import("zlib");
              const decompressed = zlib
                .inflateRawSync(base64DecodedBuffer)
                .toString("utf-8");
              console.log("Deflate 압축 해제된 XML:");
              console.log("───────────────────────────────────");
              console.log(decompressed);
              console.log("───────────────────────────────────");

              // XML 구조 분석
              const xmlLines = decompressed
                .split("\n")
                .filter((line: string) => line.trim());
              console.log("XML 구조 요약:");
              xmlLines.forEach((line: string, index: number) => {
                const trimmed = line.trim();
                if (
                  trimmed.includes("<saml") ||
                  trimmed.includes("<samlp") ||
                  trimmed.includes("ID=") ||
                  trimmed.includes("Destination=") ||
                  trimmed.includes("Issuer>") ||
                  trimmed.includes("AssertionConsumerServiceURL=")
                ) {
                  console.log(`   ${index + 1}: ${trimmed}`);
                }
              });

              // 중요한 정보 추출
              const idMatch = decompressed.match(/ID="([^"]+)"/);
              const destinationMatch = decompressed.match(
                /Destination="([^"]+)"/
              );
              const issuerMatch = decompressed.match(
                /<saml:Issuer[^>]*>([^<]+)<\/saml:Issuer>/
              );
              const acsMatch = decompressed.match(
                /AssertionConsumerServiceURL="([^"]+)"/
              );

              console.log("추출된 핵심 정보:");
              console.log(`   Request ID: ${idMatch ? idMatch[1] : "없음"}`);
              console.log(
                `   Destination: ${
                  destinationMatch ? destinationMatch[1] : "없음"
                }`
              );
              console.log(
                `   Issuer: ${issuerMatch ? issuerMatch[1] : "없음"}`
              );
              console.log(
                `   Callback URL: ${acsMatch ? acsMatch[1] : "없음"}`
              );
            } catch (inflateError) {
              console.log("❌ Deflate 압축 해제 실패:", (inflateError as Error).message);
              console.log(
                "   원본 바이너리 데이터 (hex):",
                base64DecodedBuffer.toString("hex").substring(0, 100) + "..."
              );
            }
          }
        } catch (decodeError) {
          console.log("❌ Base64 디코딩 실패:", (decodeError as Error).message);
        }
      }
    } catch (analysisError) {
      console.log("⚠️ SAML AuthnRequest 분석 중 오류:", (analysisError as Error).message);
    }

    console.log("✅ SAML AuthnRequest URL generated:", {
      url: authorizeUrl.substring(0, 100) + "...",
      fullUrlLength: authorizeUrl.length,
      processingTime: `${endTime - startTime}ms`,
      timestamp: new Date().toISOString(),
    });

    return authorizeUrl;
  } catch (error) {
    console.error("💥 Failed to create SAML AuthnRequest:", {
      error: error instanceof Error ? error.message : "Unknown error",
      stack: error instanceof Error ? error.stack : undefined,
      timestamp: new Date().toISOString(),
    });
    throw error;
  }
}

// SAML Response 검증 및 파싱 (서버 액션)
export async function validateSAMLResponse(
  samlResponse: string
): Promise<SAMLProfile> {
  "use server";

  console.log("🔍 Starting SAML Response validation...");
  console.log("📊 SAML Response info:", {
    responseLength: samlResponse.length,
    firstChars: samlResponse.substring(0, 50) + "...",
    isBase64: /^[A-Za-z0-9+/]*={0,2}$/.test(samlResponse),
    timestamp: new Date().toISOString(),
  });

  // Mock IdP 모드 체크
  if (process.env.SAML_MOCKING_IDP === 'true') {
    debugMock("Mock IdP mode - returning mock SAML profile");
    return createMockSAMLProfile(samlResponse);
  }

  // 실제 SAML 검증 수행 (기본값)
  console.log(
    "🔐 Using Real SAML validation (SAML_MOCKING_IDP=false or not set)"
  );

  try {
    console.log("⚙️ Creating SAML instance for validation...");
    const saml = new SAML(createSAMLConfig());
    console.log("✅ SAML instance created, starting validation...");

    const startTime = Date.now();
    const result = await saml.validatePostResponseAsync({
      SAMLResponse: samlResponse,
    });
    const endTime = Date.now();

    // node-saml 라이브러리는 { profile, loggedOut } 형태로 반환
    const profile = result.profile;
    if (!profile) {
      throw new Error("No profile returned from SAML validation");
    }

    // SAMLProfile 형태로 변환 (타입 안전성 확보)
    const samlProfile: SAMLProfile = {
      nameID: profile.nameID as string | undefined,
      nameIDFormat: profile.nameIDFormat as string | undefined,
      attributes: profile.attributes as Record<string, string | string[]> | undefined,
    };

    console.log("✅ Real SAML Profile validated successfully:", {
      nameID: samlProfile.nameID,
      nameIDFormat: samlProfile.nameIDFormat,
      attributeCount: Object.keys(samlProfile.attributes || {}).length,
      attributes: Object.keys(samlProfile.attributes || {}),
      processingTime: `${endTime - startTime}ms`,
      timestamp: new Date().toISOString(),
    });

    return samlProfile;
  } catch (error) {
    console.error("❌ Real SAML validation error:", {
      error: error instanceof Error ? error.message : "Unknown error",
      stack: error instanceof Error ? error.stack : undefined,
      samlResponseLength: samlResponse.length,
      timestamp: new Date().toISOString(),
    });
    throw new Error(
      `SAML validation failed: ${
        error instanceof Error ? error.message : "Unknown error"
      }`
    );
  }
}

// SAML Profile을 User 객체로 변환 (sync 함수)
export function mapSAMLProfileToUser(profile: SAMLProfile): SAMLUser {
  console.log("🔄 Mapping SAML profile to user:", {
    nameID: profile.nameID,
    attributes: profile.attributes,
  });

  // SAML attributes는 문자열 또는 배열 형태일 수 있음
  const extractAttributeValue = (key: string): string | undefined => {
    const value = profile.attributes?.[key];
    if (Array.isArray(value)) {
      return value.length > 0 ? value[0] : undefined;
    }
    return typeof value === 'string' ? value : undefined;
  };

  // 기본적으로 nameID를 사용하거나 attributes에서 추출
  const id = profile.nameID || extractAttributeValue('id') || extractAttributeValue('sub');
  const email = extractAttributeValue('email') || extractAttributeValue('emailAddress');
  const name = extractAttributeValue('name') || extractAttributeValue('displayName') || extractAttributeValue('cn');

  // 필수 필드 검증
  if (!id) {
    throw new Error('SAML profile missing required field: id (nameID)');
  }
  if (!email) {
    throw new Error('SAML profile missing required field: email');
  }
  if (!name) {
    throw new Error('SAML profile missing required field: name');
  }

  // UTF-8 문자열 정규화 및 검증
  const normalizedName = name.normalize("NFC").trim();
  
  // 한글이 깨진 경우 감지 및 로그
  const hasInvalidChars = /[\uFFFD\x00-\x1F\x7F-\x9F]/.test(normalizedName);
  if (hasInvalidChars) {
    console.warn("⚠️ Invalid UTF-8 characters detected in name:", {
      originalName: name,
      normalizedName,
      charCodes: [...normalizedName].map((c) => c.charCodeAt(0)),
      hexDump: [...normalizedName]
        .map((c) => "\\x" + c.charCodeAt(0).toString(16).padStart(2, "0"))
        .join(""),
    });
  }

  // 회사 정보는 SSO 로그인 시 없음 (evcp 도메인)
  const companyId = undefined;
  const techCompanyId = undefined;
  const domain = 'evcp';

  const user: SAMLUser = {
    id,
    email,
    name: normalizedName,
    companyId,
    techCompanyId,
    domain,
  };

  console.log("👤 Mapped user object:", JSON.stringify(user));

  return user;
}

// Mock SAML 플로우 생성 (테스트용)
function createMockSAMLFlow(relayState?: string): string {
  debugMock("Creating mock SAML flow...", { relayState });
  
  // Mock 모드에서는 Mock IdP 엔드포인트로 리다이렉션
  const baseUrl = process.env.NEXTAUTH_URL || 'http://localhost:3000';
  let mockIdpUrl = `${baseUrl}/api/auth/saml/mock-idp`;
  
  // RelayState가 있으면 URL 파라미터로 전달
  if (relayState) {
    mockIdpUrl += `?RelayState=${encodeURIComponent(relayState)}`;
  }
  
  debugMock("Mock SAML Flow - redirecting to Mock IdP:", mockIdpUrl);
  
  return mockIdpUrl;
}

// Mock SAML Profile 생성 (테스트용)
function createMockSAMLProfile(samlResponse: string): SAMLProfile {
  console.log("🎭 Creating mock SAML profile from response...");
  
  try {
    // SAML Response가 우리가 생성한 Mock인지 확인
    const decodedXML = Buffer.from(samlResponse, 'base64').toString('utf-8');
    const isMockResponse = decodedXML.includes('MockIdP');
    
    if (!isMockResponse) {
      console.warn("⚠️ Mock mode enabled but received non-mock SAML Response");
    }
    
    console.log("🎭 Mock SAML XML preview:", decodedXML.substring(0, 200) + "...");
  } catch (error) {
    console.warn("⚠️ Could not decode SAML Response for mock analysis:", (error as Error).message);
  }

  // Mock SAML Profile 반환 (실제 SAML Response와 일치하도록 문자열 형태)
  const mockProfile: SAMLProfile = {
    nameID: "testuser@samsung.com",
    nameIDFormat: "urn:oasis:names:tc:SAML:2.0:nameid-format:emailAddress",
    attributes: {
      email: "testuser@samsung.com",
      name: "테스트 사용자",
      displayName: "Test User Samsung",
      // 추가 테스트 속성들
      department: "개발팀",
      employeeId: "TEST001",
      mobile: "010-1234-5678"
    }
  };

  console.log("🎭 Mock SAML Profile created:", {
    nameID: mockProfile.nameID,
    nameIDFormat: mockProfile.nameIDFormat,
    attributeCount: Object.keys(mockProfile.attributes || {}).length,
    attributes: Object.keys(mockProfile.attributes || {}),
    timestamp: new Date().toISOString(),
  });

  return mockProfile;
}

// SAML 로그아웃 URL 생성 (서버 액션)
// 로그아웃 지원 안함. 일단 구조만 유사하게 작성해둠.
export async function createLogoutRequest(nameID: string): Promise<string> {
  "use server";

  const saml = new SAML(createSAMLConfig());
  // Profile 객체 형태로 전달
  const profile = { nameID };
  return await saml.getLogoutUrlAsync(
    profile,
    "", // RelayState
    {
      nameIDFormat: "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress",
    }
  );
}