package enseirb.myinpulse.config;

import static org.springframework.security.authorization.AuthorityAuthorizationManager.hasRole;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

import java.util.Arrays;
import java.util.List;

@Configuration
public class WebSecurityCustomConfiguration {
    // CORS configuration

    @Value("${VITE_APP_URL}")
    private String frontendUrl;

    /**
     * Configure the CORS (Cross Origin Ressource Sharing -- a security feature) configuration. The
     * only allowed website is the frontend, defined in the .env file.
     *
     * @return the CORS configuration used by the backend
     */
    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(List.of(frontendUrl));
        configuration.setAllowedMethods(Arrays.asList("GET", "OPTIONS"));
        configuration.setAllowedHeaders(
                Arrays.asList("authorization", "content-type", "x-auth-token"));
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);

        return source;
    }

    /**
     * Configure the authorisation required for each path.
     *
     * <p>admin endpoints are under /admin/* and entrepreneur are under /entrepreneur/*
     *
     * <p>If endpoints dont require authentication, they are under /unauth/
     *
     * @param http automatically filled in by spring.
     * @return a securityfilterchain, automatically used by spring.
     * @throws Exception TODO: figure out when the exception are raised
     */
    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http.authorizeHttpRequests(
                        authorize ->
                                authorize
                                        .requestMatchers("/entrepreneur/**", "/shared/**")
                                        .access(hasRole("REALM_MyINPulse-entrepreneur"))
                                        .requestMatchers("/admin/**", "/shared/**")
                                        .access(hasRole("REALM_MyINPulse-admin"))
                                        .requestMatchers("/unauth/**")
                                        .permitAll()
                                        .anyRequest()
                                        .authenticated())
                .oauth2ResourceServer(
                        oauth2 ->
                                oauth2.jwt(
                                        jwt ->
                                                jwt.jwtAuthenticationConverter(
                                                        new KeycloakJwtRolesConverter())));
        return http.build();
    }
}