import numpy as np
import pandas as pd
import itertools
import seaborn as sns
import matplotlib.pyplot as plt

# np.random.seed(127)
low = 1000
high = 1200
repeat = 120
anom_perc = 0.2

sns.set()
sns.set_style("darkgrid")


def generator(low: float, high: float, repeat: int):

    for i in range(repeat):
        num = np.random.uniform(low, high)
        curve = float(i) ** 2
        num = num + curve
        if num > high * 1.2:
            low = num - 10
            high = num + 5
        elif num < low:
            low = num - 5
            high = num + 10
        else:
            pass
        yield num


mygenerator = generator(low, high, repeat)


df = pd.DataFrame([])

for i, j in zip(mygenerator, np.arange(repeat)):
    df = df.append([pd.DataFrame({'time': j, 'bets': i, },
                                 index=[0])]).round(0)


def create_anom(dataframe, number):
    for _ in itertools.repeat(None, number):
        rows = dataframe.shape[0]
        anomaly = f"{float(dataframe.iloc[-1]['bets']) * (1 - anom_perc)}"
        anomaly = float(anomaly)
        dataframe = dataframe.append([pd.DataFrame(
            {'time': rows, 'bets': anomaly},
            index=[0])])
    return dataframe


df_anom = create_anom(df, 3)

f, axes = plt.subplots(2, 1)

for ax in axes:
    ax.set_ylim([low * 0.5, high * 1.5])

sns.lineplot(x='time', y='bets', data=df, ax=axes[0])
sns.lineplot(x='time', y='bets', data=df_anom, ax=axes[1])
plt.show()