# -*-coding:utf-8-*-
from flask import Flask, request, make_response
import pandas as pd
import numpy as np
import json
from logzero import logger
from flask import stream_with_context

import io
import csv
from house_price.house_price_predcition import run_boston_price
from ocean_wave.wave_height_mlp import predict_wave_height
from prophet_predict.prophet_predict import run_prophet

TEXT = "text"
app = Flask(__name__)


def generate(data: pd.DataFrame):
    # 用 StringIO 在内存中写，不会生成实际文件
    out = io.StringIO()
    w = csv.writer(out)
    w.writerow(data.columns.tolist())  # 先写入表头
    yield out.getvalue()
    out.seek(0)
    out.truncate(0)
    for i in range(data.shape[0]):  # 对于 data 中的每一条
        w.writerow(data.iloc[i].values.tolist())  # 传入的是一个数组 ['xxx','xxx@xxx.xxx'] csv.writer 会把它处理成逗号分隔的一行
        # 需要注意的是传入仅一个字符串 '' 时，会被逐字符分割，所以要写成 ['xxx'] 的形式
        yield out.getvalue()  # 返回写入的值
        out.seek(0)  # io流的指针回到起点
        out.truncate(0)  # 删去指针之后的部分，即清空所有写入的内容，准备下一行的写入


@app.route('/house_price/', methods=["POST"])
def predict_price():
    resp_info = dict()
    if request.method == 'POST':
        eta = request.form.get('eta', 0.05)
        max_depth = request.form.get('max_depth', 10)
        subsample = request.form.get('subsample', 0.7)
        cosample_bytree = request.form.get('cosample_bytree', 0.8)
        num_boost_round = int(request.form.get('num_boost_round', 1000))
        early_stopping_rounds = int(request.form.get('early_stopping_rounds', 200))
        train_data = request.files.get('train_data', None)
        test_data = request.files.get('test_data', None)
        logger.info(train_data)
        params = {
            "eta": float(eta),
            "max_depth": int(max_depth),
            "subsample": float(subsample),
            "cosample_bytree": float(cosample_bytree)
        }
        if not train_data:
            train_data = None
        else:
            train_data = pd.read_csv(train_data)
        if test_data is None:
            resp_info["msg"] = "测试数据为空"
            resp_info["code"] = 406
        else:
            test_data = pd.read_csv(test_data)
            if test_data.shape[0] == 0:
                resp_info["msg"] = "测试数据为空"
                resp_info["code"] = 406
            else:
                try:
                    if train_data is None:
                        rst = run_boston_price(test_data, None, num_boost_round, early_stopping_rounds, **params)
                    else:
                        rst = run_boston_price(test_data, train_data, num_boost_round, early_stopping_rounds, **params)
                except Exception as e:
                    logger.error(f"Error: {e}")
                    resp_info["msg"] = str(e)
                    resp_info["code"] = 406
                else:
                    resp_info["code"] = 200
        if resp_info["code"] == 200:
            resp = make_response(stream_with_context(generate(rst)))
            resp.headers["Content-Disposition"] = "attachment; filename=house_price.csv"
            resp.headers["Content-type"] = "text/csv"
        else:
            resp = make_response(json.dumps(resp_info))
        resp.status_code = 200
        return resp


@app.route('/ocean_wave_height/', methods=["POST"])
def predict_height():
    resp_info = dict()
    if request.method == 'POST':
        num_units = int(request.form.get('num_units', 8))
        activation = request.form.get('activation', 'relu')
        lr = float(request.form.get('learning_rate', 0.01))
        loss = request.form.get('loss', 'mae')
        epochs = int(request.form.get('num_boost_round', 100))
        train_data = request.files.get('train_data', None)
        WVHT_1 = float(request.form.get("WVHT_1", None))
        WDIR_1 = float(request.form.get("WDIR_1", None))
        WSPD_1 = float(request.form.get("WSPD_1", None))
        WDIR_2 = float(request.form.get("WDIR_2", None))
        WSPD_2 = float(request.form.get("WSPD_2", None))
        WDIR = float(request.form.get("WDIR", None))
        WSPD = float(request.form.get("WSPD", None))
        x_test = [WVHT_1, WDIR_1, WSPD_1, WDIR_2, WSPD_2, WDIR, WSPD]
        x_test = np.array([x_test])
        logger.info(f"test data: {x_test}")
        if not train_data:
            train_data = None
        else:
            try:
                train_data = pd.read_csv(train_data)
            except Exception as e:
                logger.error(f"Error: {e}")
                resp_info["msg"] = str(e)
                resp_info["code"] = 406
                train_data = None
        try:
            rst = predict_wave_height(train_data, num_units, activation, lr, loss, epochs, x_test)
        except Exception as e:
            logger.error(f"Error: {e}")
            resp_info["msg"] = "上传数据不符合海浪高度预测的规定文件示例，请检查"
            resp_info["code"] = 406
        else:
            resp_info["code"] = 200
            resp_info["data"] = str(rst)
            resp_info["dtype"] = TEXT
    resp = make_response(json.dumps(resp_info))
    resp.status_code = 200
    return resp


@app.route("/prophet/", methods=["POST"])
def run_ts_predict():
    resp_info = dict()
    file_name = "result.csv"
    if request.method == "POST":
        data_file = request.files.get("data")
        freq = request.form.get('freq')
        period = request.form.get('period')
        try:
            data = pd.read_csv(data_file)
            logger.info(data.shape)
            rest = run_prophet(data, period=int(period), freq=freq)
            logger.info(rest.columns)
            rest['ds'] = rest['ds'].apply(str)
            rest['yhat'] = rest['yhat'].apply(str)

        except Exception as e:
            logger.error(f"Error: {e}")
            resp_info["msg"] = str(e)
            resp_info["code"] = 406
        else:
            resp_info["code"] = 200
        if resp_info.get("code") == 200:
            resp = make_response(stream_with_context(generate(rest)))
            resp.headers["Content-Disposition"] = f"attachment; filename={file_name}"
            resp.headers["Content-type"] = "text/csv;charset=utf-8"
        else:
            resp = make_response(json.dumps(resp_info))
        resp.status_code = 200
        return resp


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8901, debug=False)