from flask import Flask, render_template, request, redirect, url_for
import os,shutil,hashlib
from database_tools_2 import *

app = Flask(__name__)

@app.route('/')
def index():
    makedir("static")
    return render_template('remarkindex.html')

@app.route('/show_image', methods=['POST'])
def show_image():
    if request.method == 'POST':
        global id,username
        username = request.form['username'].strip()
        # print(username)
        if len(username) <= 1:
            return "姓名有误."
        id = request.form['question_number'].zfill(6)
        mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = "tiku")
        mycursor = mydb.cursor()
        sql = "SELECT content FROM problems WHERE ID = %s AND not obsolete;"
        val = (id,)
        mycursor.execute(sql,val)
        content = mycursor.fetchall()[0][0]
        sql = "SELECT date,remark_content FROM remarks WHERE ID = %s AND not obsolete;"
        mycursor.execute(sql,val)
        remark_list = sorted(mycursor.fetchall(),key=lambda item:item[0],reverse=True)
        # print(remark_list)
        mydb.close()
        content_hash = hashlib.sha256(content.encode("utf8")).hexdigest()
        # print(content_hash,type(content_hash))
        mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = "tikupics")
        mycursor = mydb.cursor()
        mycursor.execute("SELECT hash,pic FROM pics WHERE ID = %s;",(id,))
        ret_list = mycursor.fetchall()
        if len(ret_list) > 0 and ret_list[0][0] == content_hash:
            with open(f"static/{id}.png","wb") as f:
                f.write(ret_list[0][1])
        else:
            latex_raw = ReadTextFile("模板文件/独立文件模板.txt")
            latexdata = StringSubstitute(r"<<待替换\d*>>",latex_raw,[content])
            makedir("临时文件/pics")
            currentdate = GetDate()
            currenttime = GetTime()
            SaveTextFile(latexdata,f"临时文件/pics/ID{id}-{currentdate}-{currenttime}.tex")
            os.system(f"xelatex -interaction=batchmode -output-directory=临时文件/pics ID{id}-{currentdate}-{currenttime}.tex")
            os.chdir("临时文件/pics")
            os.system(f"pdftocairo -png -r 600 ID{id}-{currentdate}-{currenttime}.pdf")
            os.chdir("../..")
            shutil.copy(f"临时文件/pics/ID{id}-{currentdate}-{currenttime}-1.png",f"static/{id}.png")
            with open(f"static/{id}.png","rb") as f:
                image_data = f.read()
                mycursor.execute("INSERT INTO pics (ID,pic,date,hash) VALUES (%s,%s,%s,%s)",(id,image_data,currentdate,content_hash))
            mydb.commit()
        mydb.close()
        output_string = ""
        for rem in remark_list:
            output_string += f"{rem[0]} {rem[1]}\n"
        output_string = re.sub(r"\n","<br><br>\n",output_string) + "<br>\n"
        return render_template('show_image.html', image_path=f'/static/{id}.png', old_remarks = output_string)


@app.route('/submit_remarks', methods=['POST'])
def submit_remarks():
    category = request.form['category']
    remarks = request.form['remarks'].replace("\n"," ").strip()
    remarks = RefinePunctuations(remarks)
    date = GetDate()
    # mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = "tikutest")
    mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = "tiku")
    mycursor = mydb.cursor()
    sql = f"SELECT * FROM remarks WHERE ID = %s and remark_content = %s AND not obsolete;"
    val = (id,f"({category}){remarks}")
    print(f"({category}){remarks}")
    mycursor.execute(sql,val)
    ret = mycursor.fetchall()
    if len(ret) == 0:
        sql = f"INSERT INTO remarks SET ID = %s, date = %s, remark_content = %s;"
        val = (id,date,f"({category}){remarks}")
        mycursor.execute(sql,val)
        ip_address = request.headers.get('X-Forwarded-For', request.remote_addr)  
        # 如果 X-Forwarded-For 头存在多个 IP 地址，则取第一个  
        if ',' in ip_address:  
            ip_address = ip_address.split(',')[0]  
        sql = "INSERT INTO logs (DATE,TIME,username,ID,action,db_content) VALUE (%s,%s,%s,%s,%s,%s);"
        val = (GetDate(),GetTime(),f"{username} at {ip_address}",id,f"网页新增备注",f"({category}){remarks}")
        mycursor.execute(sql,val)
        mydb.commit()
        mydb.close()
        return render_template('show_remarks.html', category=category, remarks=remarks)
    else:
        mydb.close()
        return f"已有备注 ({category}){remarks}"


if __name__ == '__main__':
    app.run(host = "0.0.0.0", port = 25433)