package com.moral.security.auth.login;

import com.moral.entity.Account;
import com.moral.security.model.UserContext;
import com.moral.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author vladimir.stankovic
 * <p>
 * Aug 3, 2016
 */
@Component
public class LoginAuthenticationProvider implements AuthenticationProvider {
    private final BCryptPasswordEncoder encoder;
    private final AccountService accountService;

    @Autowired
    public LoginAuthenticationProvider(final AccountService accountService, final BCryptPasswordEncoder encoder) {
        this.accountService = accountService;
        this.encoder = encoder;
    }

    /**
     * 用户名和密码认证
     *
     * @param authentication
     * @return
     * @throws AuthenticationException
     */
    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        Assert.notNull(authentication, "No authentication data provided");

        String accountName = (String) authentication.getPrincipal();
        String password = (String) authentication.getCredentials();
        LoginMode mode = (LoginMode) authentication.getDetails();
        Account account = accountService.queryAccountByName(accountName).orElseThrow(() -> new UsernameNotFoundException("User not found: " + accountName));
        if (!encoder.matches(password, account.getPassword())) {
            throw new BadCredentialsException("Authentication Failed. Username or Password not valid.");
        }

        if (account.getRoles() == null) {
            throw new InsufficientAuthenticationException("User has no roles assigned");
        }
        List<GrantedAuthority> authorities = account.getRoles().stream()
                .map(authority -> new SimpleGrantedAuthority(authority.getName()))
                .collect(Collectors.toList());

        UserContext userContext = UserContext.create(account.getAccountName(),mode,account.getOrganizationId(),authorities);

        return new UsernamePasswordAuthenticationToken(userContext, null, userContext.getAuthorities());
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return (UsernamePasswordAuthenticationToken.class.isAssignableFrom(authentication));
    }
}