package se.bilhalsning.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.servlet.http.HttpServletResponse;
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.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 se.bilhalsning.dto.ErrorResponse;
import se.bilhalsning.security.JwtAuthenticationFilter;
import se.bilhalsning.security.JwtService;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

    static final String UNAUTHENTICATED_MESSAGE =
            "Din session har löpt ut eller är ogiltig. Logga in igen.";
    static final String FORBIDDEN_MESSAGE =
            "Du har inte behörighet att utföra denna åtgärd.";

    private final ObjectMapper objectMapper = new ObjectMapper();

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

    @Bean
    public JwtService jwtService(@Value("${app.jwt.secret}") String secret) {
        return new JwtService(secret);
    }

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http,
            JwtAuthenticationFilter jwtAuthenticationFilter) throws Exception {
        http
                .csrf(csrf -> csrf.disable())
                .sessionManagement(sm -> sm.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                .authorizeHttpRequests(auth -> auth
                        .requestMatchers(
                                "/api/auth/register",
                                "/api/auth/login",
                                "/api/auth/forgot-password",
                                "/api/auth/reset-password",
                                "/api/auth/confirm-email-change")
                        .permitAll()
                        .requestMatchers("/api/webhooks/**").permitAll()
                        .requestMatchers("/api/payment/swish-info").permitAll()
                        .requestMatchers("/api/vehicles/**").permitAll()
                        .requestMatchers("/api/admin/**").hasRole("ADMIN")
                        .anyRequest().authenticated())
                .exceptionHandling(eh -> eh
                        .authenticationEntryPoint((request, response, ex) ->
                                writeError(response, HttpStatus.UNAUTHORIZED, UNAUTHENTICATED_MESSAGE))
                        .accessDeniedHandler((request, response, ex) ->
                                writeError(response, HttpStatus.FORBIDDEN, FORBIDDEN_MESSAGE)))
                .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);

        return http.build();
    }

    private void writeError(HttpServletResponse response, HttpStatus status, String message)
            throws java.io.IOException {
        response.setStatus(status.value());
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(objectMapper.writeValueAsString(new ErrorResponse(message)));
    }
}