from iqfeed import get_historical_data, minutes
from dash import Dash, dcc, html, Input, Output
from datetime import date, datetime, timedelta
from dotenv import load_dotenv
from pandas import Series
from plotting import CandlestickChart, figure_with_subplots

load_dotenv()

app = Dash(__name__)
app.title = 'Chart'

today = date.today()

app.layout = html.Div([
    dcc.Graph(
        id = 'candlestick-chart',
        config = {'displayModeBar': False},
        # Initializing with an empty chart for default styling.
        figure = figure_with_subplots([[CandlestickChart(
            x = Series(today),
            opens = Series(),
            highs = Series(),
            lows = Series(),
            closes = Series(),
            title = ''
        )]])
    ),
    # TODO: Move styling information to external file.
    html.Div([
        html.Div([
            dcc.Input(id = 'symbol', type = 'text', value = 'SPY', debounce = True)
        ], style={'display': 'inline-block', 'padding': '0 10px'}),
        html.Div([
            dcc.DatePickerSingle(
                id = 'date-picker',
                date = today,
                min_date_allowed = date(2016, 1, 1),
                max_date_allowed = today,
                display_format = 'YYYY-MM-DD'
            )
        ], style={'display': 'inline-block', 'padding': '0 10px'}),
    ], style={'margin': '0px 100px'})
])

@app.callback(
    Output('candlestick-chart', 'figure'),
    [
        Input('symbol', 'value'),
        Input('date-picker', 'date')
    ]
)
def update_graph(symbol, selected_date):
    selected_datetime = datetime.strptime(selected_date, '%Y-%m-%d')

    data = get_historical_data(
        symbol = symbol,
        interval = minutes(5),
        start_date = selected_datetime,
        end_date = selected_datetime + timedelta(days = 1)
    )

    candlestick_chart = CandlestickChart(
        x = data['Date'],
        opens = data['Open'],
        highs = data['High'],
        lows = data['Low'],
        closes = data['Close'],
        title = symbol
    )

    return figure_with_subplots([[candlestick_chart]])

if __name__ == '__main__':
    app.run_server(debug = False)