package com.example.backend.config;

import com.example.backend.services.UserService;
import com.nimbusds.jose.jwk.JWK;
import com.nimbusds.jose.jwk.JWKSet;
import com.nimbusds.jose.jwk.RSAKey;
import com.nimbusds.jose.jwk.source.ImmutableJWKSet;
import com.nimbusds.jose.jwk.source.JWKSource;
import com.nimbusds.jose.proc.SecurityContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.Customizer;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.oauth2.jwt.JwtDecoder;
import org.springframework.security.oauth2.jwt.JwtEncoder;
import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
import org.springframework.security.oauth2.jwt.NimbusJwtEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

    public static final String[] PUBLIC_URL_PATTERNS = {
            "/registrations/**",
            "/login",
            "/home",
            "/auth/**",
            "/event",
            "/events/**",
            "/api/events/**",
            "/api/registrations/**",
            "/api/forum/**",
            "/forum/**",
            "/replies/**",
            "/replies/forum/**",
            "/error",
            "/forum/replies/{id}",
            "/api/api-docs",
            "/api/swagger-ui/**",
            "/api/swagger-ui.html"
    };

    private final JWTFilter filter;
    private final UserService userService;

    @Autowired
    public SecurityConfig(JWTFilter filter, UserService userService) {
        this.filter = filter;
        this.userService = userService;
    }

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        return http
                .csrf(AbstractHttpConfigurer::disable)
                .cors(Customizer.withDefaults())
                .httpBasic(Customizer.withDefaults())
                .sessionManagement(sess -> sess.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                .userDetailsService(userService)
                .addFilterBefore(filter, UsernamePasswordAuthenticationFilter.class)
                .authorizeHttpRequests((auth) -> auth
                        .requestMatchers(PUBLIC_URL_PATTERNS).permitAll()
                        .requestMatchers("/error").anonymous()
                        .requestMatchers("/ideas/**").permitAll()
                        .anyRequest().authenticated()
                )
                .build();
    }

    @Value("${jwt.public.key}")
    private RSAPublicKey key;

    @Value("${jwt.private.key}")
    private RSAPrivateKey priv;

    @Bean
    public JwtDecoder jwtDecoder() {
        return NimbusJwtDecoder.withPublicKey(this.key).build();
    }

    @Bean
    public JwtEncoder jwtEncoder() {
        final JWK jwk = new RSAKey.Builder(this.key).privateKey(this.priv).build();
        final JWKSource<SecurityContext> jwks = new ImmutableJWKSet<>(new JWKSet(jwk));
        return new NimbusJwtEncoder(jwks);
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration authenticationConfiguration) throws Exception {
        return authenticationConfiguration.getAuthenticationManager();
    }
}