package com.emonster.taroaichat.security.jwt;

import static com.emonster.taroaichat.security.SecurityUtils.AUTHORITIES_CLAIM;
import static com.emonster.taroaichat.security.SecurityUtils.JWT_ALGORITHM;
import static com.emonster.taroaichat.security.SecurityUtils.USER_ID_CLAIM;

import com.emonster.taroaichat.security.DomainUserDetailsService.UserWithId;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.oauth2.jwt.JwsHeader;
import org.springframework.security.oauth2.jwt.JwtClaimsSet;
import org.springframework.security.oauth2.jwt.JwtEncoder;
import org.springframework.security.oauth2.jwt.JwtEncoderParameters;
import org.springframework.stereotype.Component;

@Component
public class TokenProvider {

    private static final Logger LOG = LoggerFactory.getLogger(TokenProvider.class);

    private final JwtEncoder jwtEncoder;
    private final JwtEncoder refreshTokenEncoder;

    @Value("${application.security.authentication.jwt.token-validity-in-seconds:0}")
    private long tokenValidityInSeconds;

    @Value("${application.security.authentication.jwt.token-validity-in-seconds-for-remember-me:0}")
    private long tokenValidityInSecondsForRememberMe;

    @Value("${application.security.authentication.jwt.token-validity-in-seconds-for-remember-me:0}") // using the same value as remember me
    private long refreshTokenValidityInSeconds;

    public TokenProvider(
        @Qualifier("accessTokenJwtEncoder") JwtEncoder jwtEncoder,
        @Qualifier("refreshTokenJwtEncoder") JwtEncoder refreshTokenEncoder
    ) {
        this.jwtEncoder = jwtEncoder;
        this.refreshTokenEncoder = refreshTokenEncoder;
    }

    public String createAccessToken(Authentication authentication, boolean rememberMe) {
        String authorities = authentication.getAuthorities().stream()
            .map(GrantedAuthority::getAuthority)
            .collect(Collectors.joining(" "));

        Instant now = Instant.now();
        Instant validity;
        if (rememberMe) {
            validity = now.plus(this.tokenValidityInSecondsForRememberMe, ChronoUnit.SECONDS);
        } else {
            validity = now.plus(this.tokenValidityInSeconds, ChronoUnit.SECONDS);
        }

        JwtClaimsSet.Builder builder = JwtClaimsSet.builder()
            .issuedAt(now)
            .expiresAt(validity)
            .subject(authentication.getName())
            .claim(AUTHORITIES_CLAIM, authorities);

        if (authentication.getPrincipal() instanceof UserWithId user) {
            builder.claim(USER_ID_CLAIM, user.getId());
        }

        JwsHeader jwsHeader = JwsHeader.with(JWT_ALGORITHM).build();
        return this.jwtEncoder.encode(JwtEncoderParameters.from(jwsHeader, builder.build())).getTokenValue();
    }

    public String createRefreshToken(Authentication authentication) {
        Instant now = Instant.now();
        Instant validity = now.plus(refreshTokenValidityInSeconds, ChronoUnit.SECONDS);

        JwtClaimsSet.Builder builder = JwtClaimsSet.builder()
            .issuedAt(now)
            .expiresAt(validity)
            .subject(authentication.getName())
            .claim("token_type", "refresh");

        if (authentication.getPrincipal() instanceof UserWithId user) {
            builder.claim(USER_ID_CLAIM, user.getId());
        }

        JwsHeader jwsHeader = JwsHeader.with(JWT_ALGORITHM).build();
        return this.refreshTokenEncoder.encode(JwtEncoderParameters.from(jwsHeader, builder.build())).getTokenValue();
    }
}