# coding=utf-8
import flask
import imgkit
import json
import os
import oss2
import random
from flask import request

# 创建一个服务，把当前这个python文件当做一个服务
server = flask.Flask(__name__)

# 端口配置
port = 5008
host = '127.0.0.1'
debug = True

# 工具配置
tool_path = r'/usr/local/bin/wkhtmltoimage'
# tool_path = r'E:\wkhtmltopdf\bin\wkhtmltoimage.exe'

# OSS配置
oss_end_point = 'oss-cn-shanghai.aliyuncs.com'
oss_bucket = 'hzchart'
oss_key_id = 'LTAIFMZYQhS2BTvW'
oss_key_secret = '12kk1ptCHoGWedhBnKRVW5hRJzq9Fq'
resource_host = 'https://hzstatic.hzinsights.com/'


# server.config['JSON_AS_ASCII'] = False
# @server.route()可以将普通函数转变为服务 登录接口的路径、请求方式
@server.route('/htm2img', methods=['post'])
def htm2img():
    # 获取参数
    req_data = request.get_json()
    if req_data is None:
        return json.dumps({'code': 5004, 'msg': '参数有误', 'data': ''}, ensure_ascii=False)

    # 参数校验
    contents = req_data['html_content']
    if contents is None or contents == '':
        return json.dumps({'code': 5004, 'msg': '获取html文本内容失败', 'data': ''}, ensure_ascii=False)
    width = req_data['width']
    if width <= 0:
        return json.dumps({'code': 5004, 'msg': '图片宽度有误', 'data': ''}, ensure_ascii=False)
    height = req_data['height']
    if height <= 0:
        return json.dumps({'code': 5004, 'msg': '图片长度有误', 'data': ''}, ensure_ascii=False)

    # 生成html文件
    rand_name = get_rand_string()
    html_path = 'html/' + rand_name + '.html'
    res = html2file(contents, html_path)
    if not res:
        return json.dumps({'code': 5004, 'msg': '生成html失败', 'data': ''}, ensure_ascii=False)

    # html转图片
    img_name = rand_name + '.jpg'
    img_path = html_to_img(html_path, img_name, width, height)
    if img_path == '':
        return json.dumps({'code': 400, 'msg': '生成图片失败', 'data': ''}, ensure_ascii=False)

    # 上传OSS
    upload_dir = 'static/images/yb/htm2img/'
    save_path = upload_dir + img_name
    upload_res = upload_oss_file(save_path, img_path)

    # 清除本地生成的html及图片
    clear_local_file(img_path, html_path)

    if upload_res.status == 200:
        resource_url = resource_host + save_path
        return json.dumps({'code': 200, 'msg': '生成图片成功', 'data': resource_url}, ensure_ascii=False)
    else:
        return json.dumps({'code': 400, 'msg': '生成图片失败', 'data': ''}, ensure_ascii=False)


# html文件转为图片
def html_to_img(html_url, img_name, width=100, height=100):
    path_wkimg = tool_path  # 工具路径
    cfg = imgkit.config(wkhtmltoimage=path_wkimg)
    opt = {"width": width, "height": height, "quality": 100, "format": "jpg"}

    img_path = 'img/' + img_name
    imgkit.from_file(html_url, img_path, config=cfg, options=opt)
    try:
        os.path.isfile(img_path)
        return img_path
    except Exception as e:
        # print(e)
        return ''


# 上传图片至OSS
def upload_oss_file(save_path, file_path):
    auth = oss2.Auth(oss_key_id, oss_key_secret)
    bucket = oss2.Bucket(auth, oss_end_point, oss_bucket)
    return bucket.put_object_from_file(save_path, file_path)


# 生成指定长度的随机字符串
def get_rand_string(size=28):
    random_str = ''
    base_str = 'ABCDEFGHIGKLMNOPQRSTUVWXYZabcdefghigklmnopqrstuvwxyz0123456789'
    length = len(base_str) - 1
    for i in range(size):
        random_str += base_str[random.randint(0, length)]
    return random_str


# 清除本地生成的文件
def clear_local_file(img_path, html_path):
    try:
        os.remove(img_path)
        os.remove(html_path)
        return True
    except OSError as e:
        # print(e)
        return False


# html文本生成文件
def html2file(content, file_path):
    try:
        f = open(file_path, 'w', encoding='UTF-8')
        f.write(content)
        f.close()
        return True
    except Exception as e:
        # print(e)
        return False


if __name__ == '__main__':
    server.run(debug=debug, port=port, host=host)