import gradio as gr
from pyzbar.pyzbar import decode
from lambdas import upload_models, predict
import base64
from io import BytesIO, StringIO
from PIL import Image
import pandas as pd
import os.path

DEBUG = True

prefer_frontal_cam_html = """
<script>
const originalGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);

navigator.mediaDevices.getUserMedia = (constraints) => {
  if (!constraints.video.facingMode) {
    constraints.video.facingMode = {ideal: "environment"};
  }
  return originalGetUserMedia(constraints);
};
</script>
"""

config = {'possible_shifts': {'No shifts': 0}, 'possible_modes': ["waste"]}


def login(username, password) -> bool:
    # TODO from username and password get restaurant_id
    if os.path.isfile('credentials.csv'):
        df = pd.read_csv('credentials.csv')
    else:
        s = os.environ.get('CREDENTIALS')
        df = pd.read_csv(StringIO(s))

    if not len(df):
        return False

    for idx, row in df.iterrows():
        if row['username'] == username and row['password'] == password:
            restaurant_id = int(row['restaurant_id'])
            restaurant_name = str(row['restaurant_name'])
            mode = 'waste'
            possible_modes = str(row.get('modes')).split(':')
            possible_shifts = {i.split(':')[0]: i.split(':')[1] for i in str(row.get('shifts')).split('-')}

            config_aux = {'restaurant_id': restaurant_id,
                          'restaurant_name': restaurant_name,
                          'mode': mode,
                          'possible_modes': possible_modes,
                          'possible_shifts': possible_shifts,
                          }
            config.update(config_aux)

            return True
    return False


def start_app(shift_id, mode):
    try:
        config_aux = {'shift_id': shift_id,
                      'mode': mode}
        config.update(config_aux)
        gr.Info('Loading models', )
        status_code, r = upload_models(**config)
        if status_code in (201, 200, 204):
            gr.Info('Models Correctly Loaded. Ready to predict')
        else:
            raise gr.Error(f'Error loading the models: {r}')
        config.update(r)
    except Exception as e:
        raise gr.Error(f'Error Uploading the models. \n {e}')


def predict_app(image, patient_id):
    buffered = BytesIO()
    image.save(buffered, format='JPEG')
    b64image = base64.b64encode(buffered.getvalue()).decode('utf-8')
    status_code, r = predict(b64image=b64image,
                             patient_identifier=patient_id,
                             **config)
    if status_code in (200, 201, 204):
        gr.Info('Prediction Successful')
    else:
        raise gr.Error(f'Error predicting {r}')


# APP

with gr.Blocks(head=prefer_frontal_cam_html) as block:
    with gr.Tab(label='Welcome'):
        gr.Markdown(f'# User: {config.get("restaurant_name", "Proppos")}')


        @gr.render()
        def render_dropdowns():
            shift_dropdown = gr.Dropdown(label='Meal/Comida/Apat',
                                         value=list(config["possible_shifts"].items())[0],
                                         choices=tuple(config["possible_shifts"].items()))
            mode_dropdown = gr.Dropdown(label='Mode',
                                        value=config['possible_modes'][0],
                                        choices=config["possible_modes"])
            start_button = gr.Button(value='START')
            start_button.click(fn=start_app, inputs=[shift_dropdown, mode_dropdown])

    with gr.Tab(label='📷 Capture'):
        # MAIN TAB TO PREDICT
        gr.Markdown(f""" 1. Click to Access Webcam
                         2.  
                    """)
        im = gr.Image(sources=['webcam'], streaming=True, mirror_webcam=False, type='pil')
        with gr.Accordion():
            eater_id = gr.Textbox(label='Patient Identification', placeholder='Searching Patient ID')

        current_eater_id = {'value': None}


        @gr.on(inputs=im, outputs=eater_id)
        def search_eater_id(image):
            d = decode(image)
            default_value = None
            current_value = current_eater_id['value'] or default_value
            new_value = d[0].data if d else default_value
            # If it is really a new value different from the default one, change it.
            final_value = new_value if new_value != default_value else current_value
            current_eater_id['value'] = final_value
            return final_value


        b = gr.Button('PRESS TO PREDICT')
        b.click(fn=predict_app, inputs=[im, eater_id], outputs=gr.Info())

    with gr.Tab(label='ℹ️ Status'):
        gr.Markdown(' Press the button to see the status of the Application and technical information')
        load_status_button = gr.Button('Load Status')
        status_json = gr.Json(label='Status')
        load_status_button.click(fn=lambda: config, outputs=status_json)

    with gr.Tab(label='📄 Documentation'):
        gr.Markdown()

#block.launch(auth=("proppos", "Proppos2019"))
block.launch(show_api=False, auth=login)