from concurrent.futures import ThreadPoolExecutor
import datetime
from functools import partial
import os
import io
import json
import queue
import gradio as gr
import random
import firebase_admin
from firebase_admin import db, credentials
from google.oauth2 import service_account
from googleapiclient.discovery import build
import google_auth_httplib2
import googleapiclient
from googleapiclient.http import MediaIoBaseDownload
from PIL import Image
import httplib2


#################################################################################################################################################
# Authentication
#################################################################################################################################################


# read secret api key
FIREBASE_API_KEY = os.environ['FirebaseSecret']
FIREBASE_URL = os.environ['FirebaseURL']
DRIVE_API_KEY = os.environ['DriveSecret']

SCOPES = ["https://www.googleapis.com/auth/drive"]


#################################################################################################################################################
# Types
#################################################################################################################################################


class Experiment():
    def __init__(self, corruption, image_id, corrupted, options, selected_image=None, initialized=False):
        self.corruption = corruption
        self.image_id = image_id
        self.corrupted = corrupted
        self.options = options
        self.selected_image = selected_image
        self.initialized = initialized

    def to_dict(self, custom_algo=None):
        return {
            "corruption": self.corruption,
            "image_number": self.image_id,
            "dataset": "CelebA",
            "corrupted_filename": self.corrupted["name"],
            "options": [img["name"] for img in self.options],
            "selected_image": "None" if custom_algo else self.selected_image,
            "algo": custom_algo if custom_algo is not None else self.options[self.selected_image]["algo"]
        }
    
    def to_pil(self):
        return self.corrupted["pil"], [img["pil"] for img in self.options]

    @staticmethod
    def from_dict(source):
        return Experiment(source["name"], source["corrupted"], source["options"])

    def __repr__(self):
        return f"Experiment(name={self.name}, corrupted={self.corrupted}, options={self.options})"

    def __str__(self):
        return f"Experiment(name={self.name}, corrupted={self.corrupted}, options={self.options})"

    def __eq__(self, other):
        return self.name == other.name and self.corrupted == other.corrupted and self.options == other.options
    

class App():

    NUM_THREADS = 16
    NUM_TO_SCHEDULE = 10

    def __init__(self):
        self.init_remote()
        self.init_download_thread()
        
        for _ in range(App.NUM_TO_SCHEDULE):
            self.q_requested.put({})

        self.next_experiment()
        self.build_components_from_experiment()
        

    def lifespan(self, fastapi_app):
        yield
        # cancel thredpool
        self.executor.shutdown(wait=False)
        # cancel download threads
        for _ in range(App.NUM_THREADS):
            self.q_to_download.put(None)
            self.q_requested.put(None)

    def init_remote(self):

        def build_request(http, *args, **kwargs):
            new_http = google_auth_httplib2.AuthorizedHttp(self.drive_creds, http=httplib2.Http())
            return googleapiclient.http.HttpRequest(new_http, *args, **kwargs)

        # init drive service
        self.drive_creds = service_account.Credentials.from_service_account_info(json.loads(DRIVE_API_KEY), scopes=SCOPES)
        authorized_http = google_auth_httplib2.AuthorizedHttp(self.drive_creds, http=httplib2.Http())
        self.drive_service = build("drive", "v3", requestBuilder=build_request, http=authorized_http)

        # init firebase service
        self.firebase_creds = credentials.Certificate(json.loads(FIREBASE_API_KEY))
        self.firebase_app = firebase_admin.initialize_app(self.firebase_creds, {'databaseURL': FIREBASE_URL})
        self.firebase_data_ref = db.reference("data")

    def init_download_thread(self):
        # init download thread and queue
        self.q_requested = queue.Queue()
        self.q_to_download = queue.Queue()
        self.q_processed = queue.Queue()
        self.executor = ThreadPoolExecutor(max_workers=2*App.NUM_THREADS)
        for _ in range(App.NUM_THREADS):
            self.executor.submit(download_thread, self.drive_service, self.q_to_download, self.q_processed)
            self.executor.submit(schedule_downloads, self.drive_service, self.q_to_download, self.q_requested)

    def next_experiment(self):
        self.q_requested.put({})
        self.current_experiment : Experiment = self.q_processed.get()

    def build_components_from_experiment(self):
        corrupted = self.current_experiment.corrupted
        images = self.current_experiment.options

        self.corrupted_component = gr.Image(value=corrupted["pil"], label=self.current_experiment.corruption, show_label=True, show_download_button=False, elem_id="corrupted")
        self.img_components = [
            gr.Image(value=img["pil"], label=f"{i}", show_label=False, show_download_button=False, elem_id="unsel")
            for i, img in enumerate(images)
        ]

        selected_index = self.current_experiment.selected_image
        if selected_index is not None:
            self.img_components[selected_index] = (
                gr.Image(value=images[selected_index]["pil"], label=f"{selected_index}", show_label=False, show_download_button=False, elem_id="sel")
            )

        return [*self.img_components, self.corrupted_component]
    
    def on_select(self, evt: gr.SelectData):  # SelectData is a subclass of EventData
        self.current_experiment.selected_image = int(evt.target.label)
        return self.build_components_from_experiment()

    def save(self, mode):
        print(f"Saving experiment with mode {mode}")
        if save_to_firebase(self.current_experiment, self.firebase_data_ref, mode=mode):
            self.next_experiment()
            self.build_components_from_experiment()
        return [*self.img_components, self.corrupted_component]


#################################################################################################################################################
# API calls
#################################################################################################################################################

def save_to_firebase(experiment: Experiment, firebase_data_ref, mode):
        if mode == "save" and (experiment is None or experiment.selected_image is None):
            gr.Warning("You must select an image before submitting")
            return False
        if mode == "skip":
            experiment.selected_image = None

        firebase_data_ref.push({
            **experiment.to_dict(custom_algo=mode if mode == "skip" else None),
            "timestamp": datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
        })

        gr.Info("Your choice has been saved to Firebase")
        return True

def list_folders(service):
    folders = []

    corruptions = [
        "brightness", 
        "elastic_transform", 
        "frost", 
        "impulse_noise", 
        "masking_random_color", 
        "shot_noise", 
        "speckle_noise", 
        "contrast", 
        "fog", 
        "gaussian_noise", 
        "latent", 
        "masking_vline_random_color", 
        "spatter"
    ]

    name_query = "(" + " or ".join([f"name contains '{c}'" for c in corruptions]) + ")"

    results = (
        service.files()
        .list(pageSize=50, fields="nextPageToken, files(id, name)", orderBy="name", q=f"mimeType='application/vnd.google-apps.folder' and {name_query}")
        .execute()
    )
    folders.extend(results.get("files", []))

    while "nextPageToken" in results:
        page_token = results["nextPageToken"]
        results = (
            service.files()
            .list(pageSize=50, fields="nextPageToken, files(id, name)", orderBy="name", q=f"mimeType='application/vnd.google-apps.folder' and {name_query}", pageToken=page_token)
            .execute()
        )
        folders.extend(results.get("files", []))
    
    return folders

def list_files_in_folder(service, folder, filter_=""):
    files = []

    results = (
        service.files()
        .list(pageSize=50, fields="nextPageToken, files(id, name)", orderBy="name", q=f"'{folder['id']}' in parents {'and ' + filter_ if filter_ else ''}")
        .execute()
    )
    files.extend(results.get("files", []))

    while "nextPageToken" in results:
        page_token = results["nextPageToken"]
        results = (
            service.files()
            .list(pageSize=50, fields="nextPageToken, files(id, name)", orderBy="name", q=f"'{folder['id']}' in parents {'and ' + filter_ if filter_ else ''}", pageToken=page_token)
            .execute()
        )
        files.extend(results.get("files", []))
    
    return files

def download_file(service, file):
    request = service.files().get_media(fileId=file['id'])
    fh = io.BytesIO()
    downloader = MediaIoBaseDownload(fh, request)
    done = False
    while done is False:
        status, done = downloader.next_chunk(10)
        print(f"Download image: '{file['name']}' - progress: {int(status.progress() * 100)}.")

    return Image.open(fh)


def schedule_downloads(service, q_to_download, q_requested):
    while True:
        print("Waiting for new experiment to schedule")
        if q_requested.get() is None:
            break

        print("Scheduling new experiment")
        # this should give a list of top-level folders of corruption types
        folders = list_folders(service)
        # print(f"Found {len(folders)} folders")
        # print(folders)

        # sample a random corruption from folders
        folder = random.choice(folders)

        # inside the corruption folders, there should be one folder per image id
        subfolders = list_files_in_folder(service, folder, filter_="mimeType='application/vnd.google-apps.folder'")
        # print(f"Found {len(subfolders)} subfolders")
        # print(subfolders)

        # sample a random image from subfolders
        subfolder = random.choice(subfolders)

        # list subsubfolders in the subfolder
        subsubfolders = list_files_in_folder(service, subfolder, filter_="mimeType='application/vnd.google-apps.folder'")

        # the results should be 2 subfolders: SDEdit and ODEdit
        odedit_subfolder = [f for f in subsubfolders if "ode" in f["name"]][0]
        sdedit_subfolder = [f for f in subsubfolders if "sde" in f["name"]][0]

        odedit_files = list_files_in_folder(service, odedit_subfolder)
        sdedit_files = list_files_in_folder(service, sdedit_subfolder)    
        
        selected_odedit_files = random.sample(odedit_files, k=5)
        selected_odedit_files = [{**file, "algo": "ODEdit"} for file in selected_odedit_files]

        selected_sdedit_files = random.sample(sdedit_files, k=5)
        selected_sdedit_files = [{**file, "algo": "SDEdit"} for file in selected_sdedit_files]

        corrupted_file = list_files_in_folder(service, subfolder, filter_="mimeType contains 'image/'")[0]

        selected_files = [*selected_odedit_files, *selected_sdedit_files]

        experiment = Experiment(folder["name"], subfolder["name"], corrupted_file, selected_files)

        q_to_download.put(experiment)
        q_requested.task_done()
        print("Experiment scheduled")

def download_thread(service, q_to_download, q_processed):
    while True:
        print("Waiting for experiment to download")
        experiment : Experiment = q_to_download.get()
        if experiment is None:
            break
            
        corrupted = experiment.corrupted
        print(f"Downloading file {corrupted['name']}")
        corrupted_pil = download_file(service, corrupted)
        print(f"File {corrupted['name']} downloaded")
        experiment.corrupted["pil"] = corrupted_pil

        for file in experiment.options:
            print(f"Downloading file {file['name']}")
            pil = download_file(service, file)
            print(f"File {file['name']} downloaded")
            file["pil"] = pil

        q_processed.put(experiment)
        q_to_download.task_done()
        print("Experiment downloaded")


#################################################################################################################################################
# UI
#################################################################################################################################################


css = """
#unsel {border: solid 5px transparent !important; border-radius: 15px !important}
#sel {border: solid 5px #00c0ff !important; border-radius: 15px !important}
#corrupted {margin-left: 5%; margin-right: 5%; padding: 0 !important}
#reducedHeight {height: 10px !important}
#padded {padding-left: 2%; padding-right: 2%}
"""

def build_demo():
    app = App()

    with gr.Blocks(title="Unsupervised Image Editing", css=css) as demo:

        with gr.Row(elem_id="padded"):
            corrupted_component = gr.Image(label="corr", elem_id="corrupted", show_label=False, show_download_button=False)
            with gr.Column(scale=3, elem_id="padded"):
                gr.Markdown("<div style='width: 100%'><h1 style='text-align: center; display: inline-block; width: 100%'>The sample on the left is a corrupted image</h1></div>")
                gr.Markdown("<div style='width: 100%'><h3 style='text-align: center; display: inline-block; width: 100%'>Below are decorrupted versions sampled from various models. Click on the picture you like best</h3></div>")
                btn_skip = gr.Button("I have no preference")
                btn_submit = gr.Button("Submit preference")

        img_components = []
        with gr.Row():
            for i, img in enumerate(app.img_components[:5]):
                img_components.append(gr.Image(label=f"{i}", elem_id="unsel", show_label=False, show_download_button=False))
        
        with gr.Row():
            for i, img in enumerate(app.img_components[5:]):
                img_components.append(gr.Image(label=f"{i+5}", elem_id="unsel", show_label=False, show_download_button=False))

        btn_skip.click(partial(app.save, mode="skip"), None, [*img_components, corrupted_component])
        btn_submit.click(partial(app.save, mode="save"), None, [*img_components, corrupted_component])
        for img in img_components:
            img.select(app.on_select, None, img_components, show_progress="hidden")

        demo.load(app.build_components_from_experiment, inputs=None, outputs=[*img_components, corrupted_component])

        return demo, app


if __name__ == "__main__":
    demo, app = build_demo()
    demo.launch(share=False, show_api=False, app_kwargs={"lifespan": app.lifespan})