package com.xly.erp.common.config;

import com.xly.erp.common.security.JwtAuthenticationFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
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.HttpStatusEntryPoint;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

/**
 * Spring Security 配置（docs/04 § 1.7）。
 *
 * <p>REQ-USR-001 T3：无状态 JWT 认证；放行 /api/usr/login、swagger、actuator/health，
 * 其余需认证；注册 BCryptPasswordEncoder Bean；JwtAuthenticationFilter 挂在
 * UsernamePasswordAuthenticationFilter 之前。</p>
 */
@Configuration
public class SecurityConfig {

    /**
     * 放行清单（无需 token 即可访问）。
     *
     * <p>REQ-USR-001 放行 /api/usr/login；REQ-USR-004 T5 追加 /api/usr/companies（登录页版本下拉）。
     * 抽为常量供单测断言与过滤链共用，避免清单漂移。</p>
     */
    public static final String[] PERMIT_ALL_PATHS = {
            "/api/usr/login",
            "/api/usr/companies",
            "/swagger-ui/**",
            "/swagger-ui.html",
            "/v3/api-docs/**",
            "/actuator/health",
    };

    /**
     * 密码哈希编码器（BCrypt），禁止明文存储 / 比对。
     */
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http,
                                                   JwtAuthenticationFilter jwtAuthenticationFilter)
            throws Exception {
        http
                .csrf(AbstractHttpConfigurer::disable)
                .sessionManagement(sm -> sm.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                .exceptionHandling(eh -> eh
                        .authenticationEntryPoint(new HttpStatusEntryPoint(HttpStatus.UNAUTHORIZED)))
                .authorizeHttpRequests(auth -> auth
                        .requestMatchers(PERMIT_ALL_PATHS)
                        .permitAll()
                        .anyRequest().authenticated())
                .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
        return http.build();
    }
}