package com.kamco.cd.kamcoback.members;

import com.kamco.cd.kamcoback.auth.JwtTokenProvider;
import com.kamco.cd.kamcoback.auth.RefreshTokenService;
import com.kamco.cd.kamcoback.config.api.ApiResponseDto;
import com.kamco.cd.kamcoback.members.dto.SignInRequest;
import com.kamco.cd.kamcoback.members.service.AuthService;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.media.Content;
import io.swagger.v3.oas.annotations.media.ExampleObject;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import io.swagger.v3.oas.annotations.responses.ApiResponses;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.servlet.http.HttpServletResponse;
import java.nio.file.AccessDeniedException;
import java.time.Duration;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseCookie;
import org.springframework.http.ResponseEntity;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.web.ErrorResponse;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Tag(name = "인증(Auth)", description = "로그인, 토큰 재발급, 로그아웃 API")
@RestController
@RequestMapping("/api/auth")
@RequiredArgsConstructor
public class AuthController {

  private final AuthenticationManager authenticationManager;
  private final JwtTokenProvider jwtTokenProvider;
  private final RefreshTokenService refreshTokenService;
  private final AuthService authService;

  @Value("${token.refresh-cookie-name}")
  private String refreshCookieName;

  @Value("${token.refresh-cookie-secure:true}")
  private boolean refreshCookieSecure;

  @PostMapping("/signin")
  @Operation(summary = "로그인", description = "사번으로 로그인하여 액세스/리프레시 토큰을 발급.")
  @ApiResponses({
    @ApiResponse(
      responseCode = "200",
      description = "로그인 성공",
      content = @Content(schema = @Schema(implementation = TokenResponse.class))),
    @ApiResponse(
      responseCode = "401",
      description = "로그인 실패 (아이디/비밀번호 오류, 계정잠금 등)",
      content =
      @Content(
        schema = @Schema(implementation = ErrorResponse.class),
        examples = {
          @ExampleObject(
            name = "아이디 입력 오류",
            description = "존재하지 않는 아이디",
            value = """
              {
                "code": "LOGIN_ID_NOT_FOUND",
                "message": "아이디를 잘못 입력하셨습니다."
              }
              """),
          @ExampleObject(
            name = "비밀번호 입력 오류 (4회 이하)",
            description = "아이디는 정상, 비밀번호를 여러 번 틀린 경우",
            value = """
              {
                "code": "LOGIN_PASSWORD_MISMATCH",
                "message": "비밀번호를 잘못 입력하셨습니다."
              }
              """),
          @ExampleObject(
            name = "비밀번호 오류 횟수 초과",
            description = "비밀번호 5회 이상 오류로 계정 잠김",
            value = """
              {
                "code": "LOGIN_PASSWORD_EXCEEDED",
                "message": "비밀번호 오류 횟수를 초과하여 이용하실 수 없습니다. 로그인 오류에 대해 관리자에게 문의하시기 바랍니다."
              }
              """)
        }
      ))
  })
  public ApiResponseDto<TokenResponse> signin(
    @io.swagger.v3.oas.annotations.parameters.RequestBody(
      description = "로그인 요청 정보",
      required = true)
    @RequestBody
    SignInRequest request,
    HttpServletResponse response) {

    Authentication authentication =
      authenticationManager.authenticate(
        new UsernamePasswordAuthenticationToken(request.getUsername(), request.getPassword()));

    String status = authService.getUserStatus(request);

    // INACTIVE 비활성 상태(새로운 패스워드 입력 해야함), ARCHIVED 탈퇴
    if (!"ACTIVE".equals(status)) {
      return ApiResponseDto.ok(new TokenResponse(status, null, null));
    }

    String username = authentication.getName(); // UserDetailsService 에서 사용한 username

    String accessToken = jwtTokenProvider.createAccessToken(username);
    String refreshToken = jwtTokenProvider.createRefreshToken(username);

    // Redis에 RefreshToken 저장 (TTL = 7일)
    refreshTokenService.save(
      username, refreshToken, jwtTokenProvider.getRefreshTokenValidityInMs());

    // HttpOnly + Secure 쿠키에 RefreshToken 저장
    ResponseCookie cookie =
      ResponseCookie.from(refreshCookieName, refreshToken)
        .httpOnly(true)
        .secure(refreshCookieSecure)
        .path("/")
        .maxAge(Duration.ofMillis(jwtTokenProvider.getRefreshTokenValidityInMs()))
        .sameSite("Strict")
        .build();

    response.addHeader(HttpHeaders.SET_COOKIE, cookie.toString());

    return ApiResponseDto.ok(new TokenResponse(status, accessToken, refreshToken));
  }

  @PostMapping("/refresh")
  @Operation(summary = "토큰 재발급", description = "리프레시 토큰으로 새로운 액세스/리프레시 토큰을 재발급합니다.")
  @ApiResponses({
    @ApiResponse(
      responseCode = "200",
      description = "재발급 성공",
      content = @Content(schema = @Schema(implementation = TokenResponse.class))),
    @ApiResponse(
      responseCode = "401",
      description = "만료되었거나 유효하지 않은 리프레시 토큰",
      content = @Content(schema = @Schema(implementation = ErrorResponse.class)))
  })
  public ResponseEntity<TokenResponse> refresh(String refreshToken, HttpServletResponse response)
    throws AccessDeniedException {
    if (refreshToken == null || !jwtTokenProvider.isValidToken(refreshToken)) {
      throw new AccessDeniedException("만료되었거나 유효하지 않은 리프레시 토큰 입니다.");
    }

    String username = jwtTokenProvider.getSubject(refreshToken);

    // Redis에 저장된 RefreshToken과 일치하는지 확인
    if (!refreshTokenService.validate(username, refreshToken)) {
      throw new AccessDeniedException("만료되었거나 유효하지 않은 리프레시 토큰 입니다.");
    }

    // 새 토큰 발급
    String newAccessToken = jwtTokenProvider.createAccessToken(username);
    String newRefreshToken = jwtTokenProvider.createRefreshToken(username);

    // Redis 갱신
    refreshTokenService.save(
      username, newRefreshToken, jwtTokenProvider.getRefreshTokenValidityInMs());

    // 쿠키 갱신
    ResponseCookie cookie =
      ResponseCookie.from(refreshCookieName, newRefreshToken)
        .httpOnly(true)
        .secure(refreshCookieSecure)
        .path("/")
        .maxAge(Duration.ofMillis(jwtTokenProvider.getRefreshTokenValidityInMs()))
        .sameSite("Strict")
        .build();
    response.addHeader(HttpHeaders.SET_COOKIE, cookie.toString());

    return ResponseEntity.ok(new TokenResponse("ACTIVE", newAccessToken, newRefreshToken));
  }

  @PostMapping("/logout")
  @Operation(summary = "로그아웃", description = "현재 사용자의 토큰을 무효화(리프레시 토큰 삭제)합니다.")
  @ApiResponses({
    @ApiResponse(
      responseCode = "200",
      description = "로그아웃 성공",
      content = @Content(schema = @Schema(implementation = Void.class)))
  })
  public ApiResponseDto<ResponseEntity<Object>> logout(
    Authentication authentication, HttpServletResponse response) {
    if (authentication != null) {
      String username = authentication.getName();
      // Redis에서 RefreshToken 삭제
      refreshTokenService.delete(username);
    }

    // 쿠키 삭제 (Max-Age=0)
    ResponseCookie cookie =
      ResponseCookie.from(refreshCookieName, "")
        .httpOnly(true)
        .secure(refreshCookieSecure)
        .path("/")
        .maxAge(0)
        .sameSite("Strict")
        .build();
    response.addHeader(HttpHeaders.SET_COOKIE, cookie.toString());

    return ApiResponseDto.createOK(ResponseEntity.noContent().build());
  }

  public record TokenResponse(String status, String accessToken, String refreshToken) {

  }
}