package com.agendaestudantil.configuracao;

import com.agendaestudantil.dto.RespostaApi;
import com.agendaestudantil.filtro.FiltroJwt;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.security.authentication.AuthenticationManager;
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.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Configuration
@EnableWebSecurity
public class ConfiguracaoSeguranca {

    private final FiltroJwt filtroJwt;
    private final String corsAllowedOrigins;
    private final String perfilAtivo;

    public ConfiguracaoSeguranca(FiltroJwt filtroJwt,
            @Value("${cors.allowed.origins}") String corsAllowedOrigins,
            @Value("${spring.profiles.active:dev}") String perfilAtivo) {
        this.filtroJwt = filtroJwt;
        this.corsAllowedOrigins = corsAllowedOrigins;
        this.perfilAtivo = perfilAtivo;
    }

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        List<String> pathsPublicos = new ArrayList<>(List.of(
                "/", "/index.html", "/login.html", "/cadastro.html", "/calendario.html", "/configuracoes.html",
                "/politica-privacidade.html",
                "/favicon.ico", "/imagens/**",
                "/*.css", "/*.js", "/*.ico", "/*.png",
                "/api/estudantes/cadastro", "/api/estudantes/login"));

        if ("dev".equals(perfilAtivo)) {
            pathsPublicos.add("/swagger-ui/**");
            pathsPublicos.add("/v3/api-docs/**");
        }

        http.csrf(csrf -> csrf.disable())
                .cors(cors -> cors.configurationSource(corsConfigurationSource()))
                .authorizeHttpRequests(auth -> auth
                        .requestMatchers(pathsPublicos.toArray(new String[0]))
                        .permitAll()
                        .anyRequest().authenticated())
                .exceptionHandling(ex -> ex
                        .authenticationEntryPoint((request, response, authException) -> {
                            response.setContentType(MediaType.APPLICATION_JSON_VALUE);
                            response.setStatus(HttpStatus.UNAUTHORIZED.value());
                            RespostaApi<Void> body = new RespostaApi<>(null, "Acesso nao autorizado", LocalDateTime.now());
                            new ObjectMapper().writeValue(response.getOutputStream(), body);
                        }))
                .sessionManagement(session -> session
                        .sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                .addFilterBefore(filtroJwt, UsernamePasswordAuthenticationFilter.class);

        return http.build();
    }

    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(List.of(corsAllowedOrigins.split(",")));
        configuration.setAllowedMethods(List.of("GET", "POST", "PUT", "DELETE", "OPTIONS", "PATCH"));
        configuration.setAllowedHeaders(List.of("*"));
        configuration.setExposedHeaders(List.of("Authorization"));
        configuration.setAllowCredentials(true);
        configuration.setMaxAge(3600L);
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }

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

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