package com.gcc_manpower.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.header.writers.XXssProtectionHeaderWriter;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new PasswordEncoder() {
            private final BCryptPasswordEncoder bcrypt = new BCryptPasswordEncoder();

            @Override
            public String encode(CharSequence rawPassword) {
                return bcrypt.encode(rawPassword);
            }

            @Override
            public boolean matches(CharSequence rawPassword, String dbPassword) {
                if (dbPassword != null && dbPassword.startsWith("$2a$")) {
                    return bcrypt.matches(rawPassword, dbPassword);
                }
                return rawPassword.toString().equals(dbPassword);
            }
        };
    }

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

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
                // Configure headers for clickjacking and XSS protection
                .headers(headers -> headers
                        .frameOptions(frame -> frame.sameOrigin())
                        .xssProtection(
                                xss -> xss.headerValue(XXssProtectionHeaderWriter.HeaderValue.ENABLED_MODE_BLOCK)))
                // Configure URL authorization
                .authorizeHttpRequests(auth -> auth
                        // Allow static resources
                        .requestMatchers(
                                "/assets/**",
                                "/css/**",
                                "/js/**",
                                "/images/**",
                                "/favicon.ico",
                                "/error")
                        .permitAll()
                        // Allow login pages and login API endpoints
                        .requestMatchers(
                                "/login",
                                "/api/val-app-usr-login",
                                "/gcctonermanagement/login",
                                "/gcctonermanagement/api/login",
                                "/gccservicepaymenttracker/login",
                                "/gccservicepaymenttracker/api/login",
                                "/gccservicedocuments/login",
                                "/gccservicedocuments/api/login",
                                "/gccadjustmentmanagement/login",
                                "/gccadjustmentmanagement/api/login",
                                "/gcctapaldetailsmanagement/login",
                                "/gcctapaldetailsmanagement/api/login",
                                "/gccrentalmanagement/login",
                                "/gccrentalmanagement/api/login")
                        .permitAll()
                        // Allow logout endpoints
                        .requestMatchers(
                                "/usr-logout",
                                "/gcctonermanagement/logout",
                                "/gccservicepaymenttracker/logout",
                                "/gccservicedocuments/logout",
                                "/gccadjustmentmanagement/logout",
                                "/gcctapaldetailsmanagement/logout",
                                "/gccrentalmanagement/logout")
                        .permitAll()
                        // Require authentication for all other requests
                        .anyRequest().authenticated())
                // Configure CSRF protection (ignore CSRF on the login endpoints only)
                .csrf(csrf -> csrf
                        .ignoringRequestMatchers(
                                "/api/val-app-usr-login",
                                "/gcctonermanagement/api/login",
                                "/gccservicepaymenttracker/api/login",
                                "/gccservicedocuments/api/login",
                                "/gccadjustmentmanagement/api/login",
                                "/gcctapaldetailsmanagement/api/login",
                                "/gccrentalmanagement/api/login"))
                // Session management configuration with module-aware invalid session
                // redirection
                .sessionManagement(session -> session
                        .invalidSessionStrategy((request, response) -> {
                            // Create a fresh session so requestedSessionIdValid won't cause endless loop
                            request.getSession(true);
                            String requestURI = request.getRequestURI();
                            if (requestURI.contains("/gccservicepaymenttracker")) {
                                response.sendRedirect(request.getContextPath() + "/gccservicepaymenttracker/login");
                            } else if (requestURI.contains("/gcctonermanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gcctonermanagement/login");
                            } else if (requestURI.contains("/gccservicedocuments")) {
                                response.sendRedirect(request.getContextPath() + "/gccservicedocuments/login");
                            } else if (requestURI.contains("/gccadjustmentmanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gccadjustmentmanagement/login");
                            } else if (requestURI.contains("/gcctapaldetailsmanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gcctapaldetailsmanagement/login");
                            } else if (requestURI.contains("/gccrentalmanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gccrentalmanagement/login");
                            } else {
                                response.sendRedirect(request.getContextPath() + "/login");
                            }
                        }))
                // Exception handling for unauthenticated requests with module-aware redirection
                .exceptionHandling(exceptions -> exceptions
                        .authenticationEntryPoint((request, response, authException) -> {
                            String requestURI = request.getRequestURI();
                            if (requestURI.contains("/gccservicepaymenttracker")) {
                                response.sendRedirect(request.getContextPath() + "/gccservicepaymenttracker/login");
                            } else if (requestURI.contains("/gcctonermanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gcctonermanagement/login");
                            } else if (requestURI.contains("/gccservicedocuments")) {
                                response.sendRedirect(request.getContextPath() + "/gccservicedocuments/login");
                            } else if (requestURI.contains("/gccadjustmentmanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gccadjustmentmanagement/login");
                            } else if (requestURI.contains("/gcctapaldetailsmanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gcctapaldetailsmanagement/login");
                            } else if (requestURI.contains("/gccrentalmanagement")) {
                                response.sendRedirect(request.getContextPath() + "/gccrentalmanagement/login");
                            } else {
                                response.sendRedirect(request.getContextPath() + "/login");
                            }
                        }));

        return http.build();
    }
}