from flask import (
    Blueprint, flash, g, redirect, render_template, request, url_for
)
import re
import os
from werkzeug.exceptions import abort
from werkzeug.security import generate_password_hash

from ebookman.auth import admin_login_required
from ebookman.db import get_db
from datetime import datetime
import pymysql

bp = Blueprint('admin', __name__, url_prefix='/admin')

def validateEmail(email):
    if re.match("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$", email) != None:
        return True
    else:
        return False

@bp.route('/')
@admin_login_required
def index():
    cur = get_db().cursor()
    cur.execute(
        'select * from user'
    )
    users = cur.fetchall()
    cur.close()
    return render_template("admin/index.html", users=users, cur_time=datetime.now())

@bp.route('/adduser', methods=("GET", "POST"))
@admin_login_required
def adduser():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        usermail = request.form['usermail']
        userlimi = request.form['userlimit']
        error = None
        if not userlimi.isdecimal():
            error = '用户空间必须是整数GB'
        elif not validateEmail(usermail):
            error = 'email格式不合法'
        if error is None:
            userlimi = float(userlimi)
            userlimi *= 1024 * 1024 # userlimit is stored and measured by KB
            userlimi = int(userlimi)
        if error is None:
            db = get_db()
            cur = db.cursor()
            try:
                cur.execute(
                    'insert into user(`user_name`, `user_mail`, `user_passwd`, `user_limit`) values (%s,%s,%s,%s)',
                    (username, usermail, generate_password_hash(password), userlimi,)
                )
                db.commit()

            except pymysql.IntegrityError as _e:
                error = "用户名或邮箱已经存在 %s" % (_e)
                db.rollback()
            except pymysql.Error as _e:
                error = "未知错误 %s" % (_e)
                db.rollback()
            finally:
                cur.close()
            if error is None:
                return redirect(url_for('admin.index'))
        flash(error)
    return render_template("admin/adduser.html", cur_time=datetime.now())

def remove_user_doc(uid):
    db = get_db()
    cur = db.cursor()
    cur.execute("select * from document where user_id=%s", (uid))
    documents = cur.fetchall()
    for document in documents:
        docpath = os.path.join(os.getcwd(),document['doc_url'])
        if os.path.exists(docpath):
            os.remove(docpath)
    error = None
    try:
        cur.execute("delete from document where user_id=%s", (uid))
        db.commit()
    except pymysql.Error as _e:
        error = "严重错误：%s; 请联系管理员解决问题" % (_e)
        db.rollback()
    cur.close()
    return error

@bp.route('/removeuser', methods=("GET",))
@admin_login_required
def removeuser():
    error = None
    uid_to_del = request.args.get("uid")
    if uid_to_del is not None and uid_to_del.isdecimal:
        db = get_db()
        cur = db.cursor()
        rowcnt = 0
        error = remove_user_doc(uid_to_del)
        if error is None:
            try:
                cur.callproc('clean_up_type_author', args=(uid_to_del,))
                rowcnt = cur.execute("delete from user where user.user_id=%s", (uid_to_del, ))
                db.commit()
            except pymysql.IntegrityError as _e:
                error = "用户未做好被删除的准备：%s" % (_e)
                db.rollback()
            except pymysql.Error as _e:
                error = "删除发生未知错误: %s" %(_e)
                db.rollback()
            cur.close()
            if error is None:
                if rowcnt == 0:
                    error = "由于uid不存在，可能没有被删除，请再次检查删除结果"
                else:
                    return redirect(url_for("admin.index"))
    return render_template("admin/result.html", opname="删除用户出现意外", opresult=error, cur_time=datetime.now())


@bp.route('/updateuser/<int:uid>/', methods=("POST",))
@admin_login_required
def updateuser(uid):
    error = None
    db = get_db()
    cur = db.cursor()
    cur.execute("select * from user where user_id=%s", (uid))
    userinfo = cur.fetchone()
    usermail = request.form['usermail']
    username = request.form['username']
    if userinfo is None:
        error = "%s号用户不存在！" % (uid)
    if username is None or len(username) == 0:
        username = None
    if usermail is None or len(usermail) == 0:
        usermail = None
    elif not validateEmail(usermail):
        error = "邮箱不合法"

    if error is None:
        if usermail is not None:
            try:
                cur.execute("update user set user_mail=%s where user_id=%s", (usermail, uid))
                db.commit()
            except pymysql.IntegrityError as _e:
                error = "邮箱重复！ %s" % (_e)
                db.rollback()
            except pymysql.Error as _e:
                error = "未知错误： %s" % (_e) 
                db.rollback()
        if username is not None and error is None:
            try:
                cur.execute("update user set user_name=%s where user_id=%s", (username, uid))
                db.commit()
            except pymysql.IntegrityError as _e:
                error = "用户名重复！ %s" % (_e)
                db.rollback()
            except pymysql.Error as _e:
                error = "未知错误： %s" % (_e) 
                db.rollback()
        if error is None:
            return redirect(url_for("admin.index"))
    return render_template("admin/result.html", opname="更新用户信息失败", opresult=error, cur_time=datetime.now())