package com.iespp.app.security;

import com.iespp.app.repositories.UserRepository;
import com.iespp.app.security.jwt.JwtAuthEntryPoint;
import com.iespp.app.security.jwt.JwtAuthenticationFilter;
import com.iespp.app.security.jwt.JwtUtils;
import com.iespp.app.services.CustomUserDetailsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
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.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

import java.util.Arrays;

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {

    @Autowired
    private JwtUtils jwtUtils;

    @Autowired
    private CustomUserDetailsService userDetailsService;

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private JwtAuthEntryPoint unauthorizedHandler;

    @Bean
    public JwtAuthenticationFilter authenticationJwtTokenFilter() {
        return new JwtAuthenticationFilter(jwtUtils, userDetailsService, userRepository);
    }

    @Bean
    public SessionValidationFilter sessionValidationFilter() {
        return new SessionValidationFilter(userRepository);
    }

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

    @Bean
    public DaoAuthenticationProvider authenticationProvider() {
        DaoAuthenticationProvider authProvider = new DaoAuthenticationProvider();
        authProvider.setUserDetailsService(userDetailsService);
        authProvider.setPasswordEncoder(passwordEncoder());
        return authProvider;
    }

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

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http.cors(cors -> cors.configurationSource(corsConfigurationSource()))
            .csrf(csrf -> csrf.disable())
            .exceptionHandling(exception -> exception.authenticationEntryPoint(unauthorizedHandler))
            .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
            .authorizeHttpRequests(auth -> 
                auth.requestMatchers("/api/auth/**").permitAll()
                    .requestMatchers("/api/test/**").permitAll()
                    .requestMatchers(org.springframework.http.HttpMethod.GET, "/api/programas-estudio/**").permitAll()
                    .requestMatchers(org.springframework.http.HttpMethod.GET, "/api/cursos/**").permitAll()
                    .requestMatchers(org.springframework.http.HttpMethod.GET, "/api/docentes/**").permitAll()
                    .requestMatchers(org.springframework.http.HttpMethod.OPTIONS, "/**").permitAll()
                    .anyRequest().authenticated()
            );

        http.authenticationProvider(authenticationProvider());
        http.addFilterBefore(authenticationJwtTokenFilter(), UsernamePasswordAuthenticationFilter.class);
        http.addFilterAfter(sessionValidationFilter(), JwtAuthenticationFilter.class);

        return http.build();
    }

    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("https://cevicherias.spring.informaticapp.com/seguridad%20EESSP/frontend"));
        configuration.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "OPTIONS"));
        configuration.setAllowedHeaders(Arrays.asList("Authorization", "Content-Type", "X-Requested-With", "X-Session-Token"));
        configuration.setAllowCredentials(true);

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }
}