// Package models .
package models

import (
	"errors"
	"fmt"
	"regexp"
	"strings"
	"time"

	ldap "gopkg.in/ldap.v2"

	"github.com/astaxie/beego"
	"github.com/astaxie/beego/logs"
	"github.com/astaxie/beego/orm"
	"github.com/lifei6671/godoc/conf"
	"github.com/lifei6671/godoc/utils"
)

type Member struct {
	MemberId int    `orm:"pk;auto;unique;column(member_id)" json:"member_id"`
	Account  string `orm:"size(100);unique;column(account)" json:"account"`
	Password string `orm:"size(1000);column(password)" json:"-"`
	//认证方式: local 本地数据库 /ldap LDAP
	AuthMethod  string `orm:"size(10);column(auth_method);default(local)" json:"auth_method)"`
	Description string `orm:"column(description);size(2000)" json:"description"`
	Email       string `orm:"size(100);column(email);unique" json:"email"`
	Phone       string `orm:"size(255);column(phone);null;default(null)" json:"phone"`
	Avatar      string `orm:"size(1000);column(avatar)" json:"avatar"`
	//用户角色：0 超级管理员 /1 管理员/ 2 普通用户 .
	Role          int       `orm:"column(role);type(int);default(1);index" json:"role"`
	RoleName      string    `orm:"-" json:"role_name"`
	Status        int       `orm:"column(status);type(int);default(0)" json:"status"` //用户状态：0 正常/1 禁用
	CreateTime    time.Time `orm:"type(datetime);column(create_time);auto_now_add" json:"create_time"`
	CreateAt      int       `orm:"type(int);column(create_at)" json:"create_at"`
	LastLoginTime time.Time `orm:"type(datetime);column(last_login_time);null" json:"last_login_time"`
}

// TableName 获取对应数据库表名.
func (m *Member) TableName() string {
	return "members"
}

// TableEngine 获取数据使用的引擎.
func (m *Member) TableEngine() string {
	return "INNODB"
}

func (m *Member) TableNameWithPrefix() string {
	return conf.GetDatabasePrefix() + m.TableName()
}

func NewMember() *Member {
	return &Member{}
}

// Login 用户登录.
func (m *Member) Login(account string, password string) (*Member, error) {
	o := orm.NewOrm()

	member := &Member{}

	err := o.QueryTable(m.TableNameWithPrefix()).Filter("account", account).Filter("status", 0).One(member)

	if err != nil {
		if beego.AppConfig.DefaultBool("ldap_enable", false) == true {
			logs.Info("转入LDAP登陆")
			return member.ldapLogin(account, password)
		} else {
			logs.Error("用户登录 => ", err)
			return member, ErrMemberNoExist
		}
	}

	switch member.AuthMethod {
	case "local":
		ok, err := utils.PasswordVerify(member.Password, password)
		if ok && err == nil {
			m.ResolveRoleName()
			return member, nil
		}
	case "ldap":
		return member.ldapLogin(account, password)
	default:
		return member, ErrMemberAuthMethodInvalid
	}

	return member, ErrorMemberPasswordError
}

//ldapLogin 通过LDAP登陆
func (m *Member) ldapLogin(account string, password string) (*Member, error) {
	if beego.AppConfig.DefaultBool("ldap_enable", false) == false {
		return m, ErrMemberAuthMethodInvalid
	}
	var err error
	lc, err := ldap.Dial("tcp", fmt.Sprintf("%s:%d", beego.AppConfig.String("ldap_host"), beego.AppConfig.DefaultInt("ldap_port", 3268)))
	if err != nil {
		return m, ErrLDAPConnect
	}
	defer lc.Close()
	err = lc.Bind(beego.AppConfig.String("ldap_user"), beego.AppConfig.String("ldap_password"))
	if err != nil {
		return m, ErrLDAPFirstBind
	}
	searchRequest := ldap.NewSearchRequest(
		beego.AppConfig.String("ldap_base"),
		ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
		fmt.Sprintf("(&(objectClass=User)(%s=%s))", beego.AppConfig.String("ldap_attribute"), account),
		[]string{"dn", "mail"},
		nil,
	)
	searchResult, err := lc.Search(searchRequest)
	if err != nil {
		return m, ErrLDAPSearch
	}
	if len(searchResult.Entries) != 1 {
		return m, ErrLDAPUserNotFoundOrTooMany
	}
	userdn := searchResult.Entries[0].DN
	err = lc.Bind(userdn, password)
	if err != nil {
		return m, ErrorMemberPasswordError
	}
	if m.Account == "" {
		m.Account = account
		m.Email = searchResult.Entries[0].GetAttributeValue("mail")
		m.AuthMethod = "ldap"
		m.Avatar = "/static/images/headimgurl.jpg"
		m.Role = beego.AppConfig.DefaultInt("ldap_user_role", 2)
		err = m.Add()
		if err != nil {
			logs.Error("自动注册LDAP用户错误", err)
			return m, ErrorMemberPasswordError
		}
		m.ResolveRoleName()
	}
	return m, nil
}

// Add 添加一个用户.
func (m *Member) Add() error {
	o := orm.NewOrm()

	if ok, err := regexp.MatchString(conf.RegexpAccount, m.Account); m.Account == "" || !ok || err != nil {
		return errors.New("账号只能由英文字母数字组成，且在3-50个字符")
	}
	if m.Email == "" {
		return errors.New("邮箱不能为空")
	}
	if ok, err := regexp.MatchString(conf.RegexpEmail, m.Email); !ok || err != nil || m.Email == "" {
		return errors.New("邮箱格式不正确")
	}
	if m.AuthMethod == "local" {
		if l := strings.Count(m.Password, ""); l < 6 || l >= 50 {
			return errors.New("密码不能为空且必须在6-50个字符之间")
		}
	}
	if c, err := o.QueryTable(m.TableNameWithPrefix()).Filter("email", m.Email).Count(); err == nil && c > 0 {
		return errors.New("邮箱已被使用")
	}

	hash, err := utils.PasswordHash(m.Password)

	if err != nil {
		return err
	}

	m.Password = hash

	_, err = o.Insert(m)

	if err != nil {
		return err
	}
	m.ResolveRoleName()
	return nil
}

// Update 更新用户信息.
func (m *Member) Update(cols ...string) error {
	o := orm.NewOrm()

	if m.Email == "" {
		return errors.New("邮箱不能为空")
	}
	if _, err := o.Update(m, cols...); err != nil {
		return err
	}
	return nil
}

func (m *Member) Find(id int) (*Member, error) {
	o := orm.NewOrm()

	m.MemberId = id
	if err := o.Read(m); err != nil {
		return m, err
	}
	m.ResolveRoleName()
	return m, nil
}

func (m *Member) ResolveRoleName() {
	if m.Role == conf.MemberSuperRole {
		m.RoleName = "超级管理员"
	} else if m.Role == conf.MemberAdminRole {
		m.RoleName = "管理员"
	} else if m.Role == conf.MemberGeneralRole {
		m.RoleName = "普通用户"
	}
}

func (m *Member) FindByAccount(account string) (*Member, error) {
	o := orm.NewOrm()

	err := o.QueryTable(m.TableNameWithPrefix()).Filter("account", account).One(m)

	if err == nil {
		m.ResolveRoleName()
	}
	return m, err
}

func (m *Member) FindToPager(pageIndex, pageSize int) ([]*Member, int64, error) {
	o := orm.NewOrm()

	var members []*Member

	offset := (pageIndex - 1) * pageSize

	totalCount, err := o.QueryTable(m.TableNameWithPrefix()).Count()

	if err != nil {
		return members, 0, err
	}

	_, err = o.QueryTable(m.TableNameWithPrefix()).OrderBy("-member_id").Offset(offset).Limit(pageSize).All(&members)

	if err != nil {
		return members, 0, err
	}

	for _, m := range members {
		m.ResolveRoleName()
	}
	return members, totalCount, nil
}

func (c *Member) IsAdministrator() bool {
	if c == nil || c.MemberId <= 0 {
		return false
	}
	return c.Role == 0 || c.Role == 1
}

func (m *Member) FindByFieldFirst(field string, value interface{}) (*Member, error) {
	o := orm.NewOrm()

	err := o.QueryTable(m.TableNameWithPrefix()).Filter(field, value).OrderBy("-member_id").One(m)

	return m, err
}