import sys
import json
import random
import base64
from flask import Flask, redirect, url_for, request, session, make_response, jsonify, send_file
from flask import render_template
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import Integer, String, Column, Float
from datetime import datetime
import uuid
from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy import select, join
from sqlalchemy.orm import DeclarativeBase
#from flask_wtf.csrf import CSRFProtect
import os
import csv
from zipfile import ZipFile
import hashlib

# activate environment: cd C:\...\...\....\...\Code\SLAEForms Testing\.venv\Scripts\
# then this: activate

#SETUP--------------------------------------------------

#Set up sqlalchemy
class Base(DeclarativeBase):
  pass

db = SQLAlchemy(model_class=Base)

#create the app
app = Flask(__name__)
# configure the database, give it a path (it will be in the instances folder)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///database.db"
app.config["PERMANENT_SESSION_LIFETIME"] = 10800 #3 Stunden, 10800 sekunden
app.config['MAX_CONTENT_LENGTH'] = 22 * 1000 * 1000 # try and fix video upload not working
db.init_app(app)

#set the secret key (TODO change this for final deployment)
app.secret_key = b"29fe9e8edd407c5491d4f1c05632d9fa33e26ed8734a3f5e080ebac3772a555a"

UPLOAD_FOLDER = 'uploads'
EXPORT_FOLDER = 'exports'
PASSWORD = 'd5aff9fc14d1f20f4ccddaa8b4f2c1765228b74ed0b1dfb868bf1064e0d655e2'
CONFIGFILE = 'userstudy1.json'
# CONFIGFILE = 'test.json'
# CONFIGFILE = 'default.json'

#csrf = CSRFProtect(app) #enable CSRF protection globally


#------------------------------------------------------------------------
# Setting up DB Models

# This table is always created, tracks all users
class User(db.Model): 
    user_id = db.Column("user_id",db.UUID(as_uuid=True), primary_key=True, nullable=False)
    device_id = db.Column("device_id",db.UUID(as_uuid=True), nullable=False)
    question_order = db.Column("question_order",db.String(60))
    date_created = db.Column("date_created",db.DateTime, default=datetime.today()) # todo test if this default works
    form_completed = db.Column("form_completed",db.Boolean, default=False)
    def __repr__(self) -> str:
        return "<User %r>" % self.user_id

# create the table (existing tables are not overwritten)
try:
    with app.app_context():
        db.create_all()
except SQLAlchemyError as e:
        print("Error occurred during database creation:", str(e))


#-----------------------------------------------------------------------------
#open, parse and execute json file

#open the json file with the config
configfile = open(CONFIGFILE, encoding='utf-8') #todo replace with other name
#convert it to dict
config = json.load(configfile)
configfile.close()
db_tables = {}  # contains all dynamically created tables, key = table/classname


#TODO insert code to create all tables
def create_json_tables():
    #print(config)
    for block_key, block_content in config.items():
        if "database_table" in block_content:
            if not (block_content["database_table"]["table_name"] in db_tables):
                print("New table: \n {table}".format(table=block_content["database_table"]["table_name"]))
                db_tables[block_content["database_table"]["table_name"]]=create_model_class(block_content["database_table"])
                print("created table: {table}".format(table=db_tables[block_content["database_table"]["table_name"]]))

    print("tables in db_tables: \n {db_tables}".format(db_tables=db_tables))

def create_model_class(schema):
    class_name = schema["table_name"].capitalize()
    #print("creating table class: {class_name}".format(class_name=class_name))
    
    # Define class attributes dynamically
    attributes = {"__tablename__": schema["table_name"]}

    # id as key and date as standard fields
    attributes["id"] = Column("id",db.UUID(as_uuid=True), primary_key=True, nullable=False)
    attributes["user_id"] = Column("user_id",db.UUID(as_uuid=True), nullable=False)
    attributes["date_created"] = db.Column("date_created",db.DateTime)
    attributes["stimulus_name"] = db.Column("stimulus_name",db.String(30))
    

    for column_name, column_info in schema["fields"].items():
        if column_info["type"] == "integer":
            column_type = Integer
        elif column_info["type"] == "string":
            column_type = String(int(column_info["size"]))
        if column_info["type"] == "float":
            column_type = Float

        attributes[column_name] = Column(column_name,column_type, nullable=column_info["nullable"])
    
    #print("attributes of the table: ",attributes)
    # Create the model class
    return type(class_name, (db.Model,), attributes)



create_json_tables()
# create the table (existing tables are not overwritten)
try:
    print("try to create tables")
    with app.app_context():
        db.create_all()
    print("successfully created all tables")
except SQLAlchemyError as e:
        print("Error occurred during database creation:", str(e))


#------------------------------------------------------------------------------
#actual page logic with start, form and send

#@app.route("/popuptest", methods=["GET"])
def popuptest():

    return render_template(
        "popuptest.html"
    )


@app.route("/start", methods=["GET", "POST"])
def startpage():
    session.permanent = False
    if not "slaeform_device_id" in session:
        # If this device was not seen, remember it.
        new_device_id = uuid.uuid4()
        session["slaeform_device_id"] = new_device_id
        session["agreed_to_tos"] = False
        

    
    if request.method == "POST":
        #right now if a user that has an active session goes to the startpage again and accepts tos 
        #it will just start another session and discard the previous session
        
        #config is the dict with the info
        #get the block names
        block_names = config.keys()
        session["block_names"] = list(block_names)
        session["block_order"] = {} # only for templates, for each block the list of keys for stimuli
        session["current_block_index"] = 0
        session["current_stimulus_index"] = 0
        session["current_block_name"] = session["block_names"][session["current_block_index"]]
        session["number_of_blocks"] = len(session["block_names"])
        current_block = config[session["current_block_name"]]
        session["number_of_stimuli"] = 0

        # if the block has stimuli, get how many
        if "stimuli" in current_block:
            if current_block["stimuli"]["type"] == "single_video" or current_block["stimuli"]["type"] == "empty":
                session["number_of_stimuli"] = len(list(current_block["stimuli"]["list"]))
            elif current_block["stimuli"]["type"] == "double_video":
                session["number_of_stimuli"] = len(list(current_block["stimuli"]["list_1"]))

        print("number of blocks: ",len(session["block_names"]))
        
        print("Startpage post")
        print(session["block_names"])

        for name in block_names:
            print("block: ",name)
            if config[name]["type"] == "TaskTemplate" and ("stimuli" in config[name]):
                    match config[name]["stimuli"]["type"]:
                        case "single_video": 
                            order = list(config[name]["stimuli"]["list"]) # order = list of simuli keys
                            print("order: ",order)
                            if "order" in config[name]["stimuli"]:
                                if config[name]["stimuli"]["order"] == "random":
                                    random.shuffle(order) #in random order
                                session["block_order"][name] = order
                        case "double_video": 
                            order = [] # order = list of stimuli keys
                            list_1 = list(config[name]["stimuli"]["list_1"])
                            list_2 = list(config[name]["stimuli"]["list_2"])
                            for i in range(len(list(config[name]["stimuli"]["list_1"]))):
                                order.append((list_1[i], list_2[i]))
                            print("order: ",order)
                            #TODO random is not implemented here
                            session["block_order"][name] = order
                        case "empty":
                            order = list(config[name]["stimuli"]["list"]) # order = list of simuli keys
                            print("order: ",order)
                            session["block_order"][name] = order


        if "stimuli" in current_block:
            #get the name of the current stimulus
            session["current_stimulus_name"] = session["block_order"][session["current_block_name"]][session["current_stimulus_index"]]

        #save the new user to the database and the session
        session["agreed_to_tos"] = True
        new_user_id = uuid.uuid4()
        session["slaeform_user_id"] = new_user_id
        device_id = session["slaeform_device_id"]
        user_id = new_user_id
        question_order = str(session["block_order"])
        date = datetime.today()
        new_user = User(user_id=user_id, device_id=device_id,question_order=question_order,date_created = date,form_completed=False) #,question_order=question_order

        db.session.add(new_user)
        db.session.commit()


        print("block order: {order}".format(order=session["block_order"]))
        try:
            db.session.add(new_user)
            db.session.commit()

        except:
            return "There was a problem while adding the user to the Database"
        return redirect("/form")
    
    return render_template(
        "startpage.html"
    )

@app.route("/endpage")
def endpage():
    print("Form is done, sent to endpage")
    return render_template("endpage.html")

@app.route("/datenschutz")
def datenschutz():
    return render_template("datenschutz.html")

@app.route("/impressum")
def impressum():
    return render_template("impressum.html")

@app.route("/studytest")
def studytest():
    return render_template("studytest.html")


@app.route("/form")
def form():
    #user is not yet registered and should not be here
    if not "slaeform_user_id" in session:
        return redirect("/start") #TODO replace this later with actual startpage
    

    current_block = config[session["current_block_name"]]
    print("form")
    print("current_block_name: {current_block_name}".format(current_block_name=session["current_block_name"]))
    print("current_block_index: {current_block_order}".format(current_block_order=session["current_block_index"]))
    print("current_stimulus: {current_stimulus}".format(current_stimulus=session["current_stimulus_index"]))
    
    #print("current Blockname: {blockname}, current block index: {blockindex}, current stim index: {stimulusindex}".format(blockname=session["current_block_name"],
    #                                                                                blockindex=session["current_block_index"],
    #                                                                                stimulusindex=session["current_stimulus_index"] ) )
    infovideo = None
    if "infovideo" in current_block:
        infovideo = current_block["infovideo"]

    # erster Fall: SinglePage
    if current_block["type"] == "SinglePage":
        return render_template(current_block["template"])
   
    
    #zweiter Fall, empty TaskTemplate
    if current_block["type"] == "TaskTemplate" and current_block["stimuli"]["type"] == "empty":
        current_block_order = session["block_order"][session["current_block_name"]]
        current_block_stimuli = current_block["stimuli"]
        current_stimulus = current_block_order[session["current_stimulus_index"]]
        stimulus_type=current_block["stimuli"]["type"]
        return render_template(
        "standard_template.html",
        stimuli=current_block_stimuli,
        stimulus_type=stimulus_type,
        current_stimulus=current_stimulus,
        questions=current_block["questions"],
        infovideo=infovideo
        )


    # ansonsten, templates:
    current_block_order = session["block_order"][session["current_block_name"]]
    current_block_stimuli = current_block["stimuli"]
    current_stimulus = current_block_order[session["current_stimulus_index"]]
    stimulus_type=current_block["stimuli"]["type"]
    stimulus_configuration = current_block["stimuli"]["configuration"] # dict with the config
    
    

    if current_block["type"] == "TaskTemplate":
        print("case: TaskTemplate")
        match stimulus_type:
            case "single_video":
                stimulus_configuration["video_url"] = config[session["current_block_name"]]["stimuli"]["list"][current_stimulus]
                print("-------------videourl: ", stimulus_configuration["video_url"])
            case "double_video":
                stimulus_configuration["video_url1"] = config[session["current_block_name"]]["stimuli"]["list_1"][current_stimulus[0]]
                stimulus_configuration["video_url2"] = config[session["current_block_name"]]["stimuli"]["list_2"][current_stimulus[1]]

        return render_template(
        "standard_template.html",
        stimuli=current_block_stimuli,
        stimulus_type=stimulus_type,
        current_stimulus=current_stimulus,
        stimulus_configuration=stimulus_configuration,
        questions=current_block["questions"],
        infovideo=infovideo
        )
    
    
    

    return "Error, none of the Blocks triggered"


@app.route("/send", methods=["POST"])
def sendpage():
    print("send")
    # Do I need to write to a table at all?
    # I can figure it out by checking if the current block has a database field, that is best
    if not ("database_table" in config[session["current_block_name"]]): #it has no database field, so nothing to receive
        # so just move on
        print("no database table")
        update_session()
        return redirect("/form")
    
    
    
    # now to if it has a database field

    # find out which table we need to write to
    table_name = config[session["current_block_name"]]["database_table"]["table_name"]
    print("Form posted: {rqform}".format(rqform=request.form))
    print("Writing to table: {table_name}".format(table_name=table_name))
    session_user_id = session["slaeform_user_id"]
    new_id = uuid.uuid4()
    date = datetime.today()
    stimulus_name = str(session["current_stimulus_name"])

    new_entry = db_tables[table_name](id=new_id,user_id = session_user_id,date_created = date,stimulus_name=stimulus_name)
    
    # handle possible Video that was send
    if 'recordedVideo' in request.files:
        video = request.files['recordedVideo']
        formatted_date = date.strftime("%Y.%m.%d %H-%M-%S")
        print("date: ", date)
        video_name =  str(session_user_id) + "_" + session["current_block_name"] + "_" + str(session["current_stimulus_name"]) + "_" + str(formatted_date) + ".webm"
        path = os.path.join(UPLOAD_FOLDER, video_name)
        print("path: ",path)
        os.makedirs(UPLOAD_FOLDER, exist_ok=True)
        video.save(path)
    
    if 'recordedVideo' in request.files:
        if hasattr(new_entry, "video_upload"):
            setattr(new_entry, "video_upload", video_name)


    # TODO maybe find a prettier solution, this handeles multiple choice now, so the fact that there can be
    # multiple keys that are the same in the form data, but I want to bring them together to 1 key value pair
    form_data = {}
    for key in request.form:
        values = request.form.getlist(key)

        # If there's more than one value for the key, join them with commas
        if len(values) > 1:
            form_data[key] = ','.join(map(str, values))  # Join multiple values into a single comma-separated string
        else:
            form_data[key] = values[0]  # If only one value, store it directly

    for key, value in form_data.items():
        print("hasattr key: ", key)
        if hasattr(new_entry, key):
            print("key exists: ", key)
            setattr(new_entry, key, value)
            print("setattr value: ", value)
    print("entry: ", new_entry)
    try:
        db.session.add(new_entry)
        db.session.commit()
    except Exception as e:
            print("Error occurred: {e}".format(e=str(e)))
            return "There was a problem while adding the response to the Database"
    

    if (session["current_block_index"] == session["number_of_blocks"]-1) and (session["current_stimulus_index"] >= session["number_of_stimuli"]-1):
        #update the database entry, the form is completed
        user = db.session.query(User).filter_by(user_id=session["slaeform_user_id"]).one()
        user.form_completed = True
        print("updated db entry for form_completed")
        # This user is done, so we can remove it from the session
        session.pop("slaeform_user_id")
        try:
            db.session.commit()
        except Exception as e:
            print("Error occurred: {e}".format(e=str(e)))
            return "There was a problem while updating the user"
        return redirect("/endpage")
        
    # Now move to the next stimulus or block
    update_session()
    print("now redirect and reload the page")
    return redirect("/form")

def update_session():
    print("update session")
    if "stimuli" in config[session["current_block_name"]]:
        # if there are stimuli in this block
        if session["current_stimulus_index"] < session["number_of_stimuli"]-1:
            print("there are still stimuli left")
            # if there are still stimuli left, keep going through them
            session["current_stimulus_index"] += 1
            # set the name of the current stimulus
            session["current_stimulus_name"] = session["block_order"][session["current_block_name"]][session["current_stimulus_index"]]

        else:
            print("here are no stimuli left")
            session["number_of_stimuli"] = 0
            # if there are no stimuli left..
            if(session["current_block_index"] < session["number_of_blocks"]-1):
                # go to next block if possible
                session["current_block_index"] += 1
                session["current_block_name"] = session["block_names"][session["current_block_index"]]
                session["current_stimulus_index"] = 0
                if "stimuli" in config[session["current_block_name"]]:
                    session["number_of_stimuli"] = len(session["block_order"][session["current_block_name"]])
            
    else:
        # if there arent any stimuli, go to the next block
        session["number_of_stimuli"] = 0
        session["current_stimulus_index"] = 0
        if(session["current_block_index"] < session["number_of_blocks"]-1):
            session["current_block_index"] += 1 
            session["current_block_name"] = session["block_names"][session["current_block_index"]]
            
    #set values for the new block
    current_block = config[session["current_block_name"]]

    if "stimuli" in current_block:
        # set the name of the current stimulus
        session["current_stimulus_name"] = session["block_order"][session["current_block_name"]][session["current_stimulus_index"]]

        # if the block has stimuli, get how many
        if current_block["stimuli"]["type"] == "single_video" or current_block["stimuli"]["type"] == "empty":
            session["number_of_stimuli"] = len(list(current_block["stimuli"]["list"]))
        elif current_block["stimuli"]["type"] == "double_video":
            session["number_of_stimuli"] = len(list(current_block["stimuli"]["list_1"]))
    
    print("---Session updated-----------------------------------------------")
    print("current_block_index / number_of_blocks: {current_block_index} / {number_of_blocks}".format(current_block_index=session["current_block_index"],number_of_blocks=session["number_of_blocks"]))
    print("current_block_name: ", session["current_block_name"])
    print("current_stimulus_index: ", session["current_stimulus_index"])
    print("Current number_of_stimuli: ", session["number_of_stimuli"])

#@app.route("/update")
def update():
    
    print("Current Session: ",session)
    try:
        user = db.session.query(User).filter_by(user_id=session["slaeform_user_id"]).one()
        user.form_completed = True
        db.session.commit()
    except Exception as e:
        print("Error occurred: {e}".format(e=str(e)))
        return "There was a problem while updating the user"
    
    return "db entry updated!"
    


# Database stuff------------------------------------------------------------------------------

def zipdir(path, ziph):
    # ziph is zipfile handle
    for root, dirs, files in os.walk(path):
        for file in files:
            ziph.write(os.path.join(root, file), 
                       os.path.relpath(os.path.join(root, file), 
                                       os.path.join(path, '..')))

#create all csvs
def create_all_csvs():
    meta = db.metadata
    tables = meta.tables.keys()

    for table_name in tables:
        create_csv(meta.tables[table_name], table_name)


# export CSV
@app.route("/export_all_tables")
def export_all_tables():
    if not session.get("logged_in"):
        return redirect("/login")
    
    create_all_csvs()

    with ZipFile('zip_exports/all_tables.zip', 'w') as zipf: #no compression, need to add zipfile.ZIP_DEFLATED for compression
        zipdir('exports/', zipf)
    
    return send_file("zip_exports/all_tables.zip", as_attachment=False, download_name="all_tables.zip")

# export Database
@app.route("/export_db")
def export_db():
    if not session.get("logged_in"):
        return redirect("/login")

    with ZipFile('zip_exports/db.zip', 'w') as zipf: #no compression, need to add zipfile.ZIP_DEFLATED for compression
        zipdir('instance/', zipf)
    
    return send_file("zip_exports/db.zip", as_attachment=False, download_name="db.zip")
    
# export CSV
@app.route("/export_all_videos")
def export_all_videos():
    if not session.get("logged_in"):
        return redirect("/login")
    
    with ZipFile('zip_exports/all_videos.zip', 'w') as zipf: #no compression, need to add zipfile.ZIP_DEFLATED for compression
        zipdir('uploads/', zipf)
    
    return send_file("zip_exports/all_videos.zip", as_attachment=False, download_name="all_tables.zip")
 

def create_csv(table, filename):
    filename = filename + ".csv"
    # Query all data from the table
    data = db.session.query(table).all()

    # Get the column names from the model
    column_names = [column.name for column in table.columns]

    # Open a CSV file and write data
    path = os.path.join(EXPORT_FOLDER, filename)
    with open(path, 'w', newline='') as file:
        writer = csv.writer(file)
        writer.writerow(column_names)  # Write header
        for row in data:
            writer.writerow([getattr(row, column) for column in column_names])


# export CSV
@app.route("/export_csv/<table_name>")
def export_csv(table_name):

    meta = db.metadata

    try:
        create_csv(meta.tables[table_name], table_name)
    except Exception as e:
        return f'Error occurred: {str(e)}', 500
    
    return redirect("/")

# the contents of all tables
@app.route("/table_contents")
def table_contents():
    if not session.get("logged_in"):
        return redirect("/login")
    meta = db.metadata
    #meta.reflect(db.engine) # Uncomment this to also get the hidden tables, but this crashes rn
    tables = meta.tables.keys()
    table_contents = {}

    for table_name in tables:
        table = meta.tables[table_name]
        columns = table.columns.keys()
        #print(table)
        rows = db.session.query(table)
        try:
            rows = rows.all()
        except Exception as e:
            print("Error occurred: {e}".format(e=str(e)))
            print("Values:\n Table = {table}\n Tabletype = {tabletype}\n".format(table=table,tabletype=type(table)))
    
        table_contents[table_name] = {
            'columns': columns,
            'rows': rows
        }
    
    return render_template(
        "table_contents.html",
        table_contents=table_contents,
    )



@app.route('/show_tables')
def show_tables():
    if not session.get("logged_in"):
        return redirect("/login")
    meta = db.metadata
    meta.reflect(db.engine)
    tables = meta.tables
    return render_template('show_tables.html', tables=tables)

@app.route("/manage_uploads")
def manage_uploads():
    if not session.get("logged_in"):
        return redirect("/login")

    videodir = "uploads/"
    videolist = os.listdir(videodir)
    num_videos = len(videolist)
    
    return render_template("manage_uploads.html", videolist=videolist, num_videos=num_videos)
    


@app.route("/deleteuploads", methods=["POST"])
def deleteuploads():
    if not session.get("logged_in"):
        return redirect("/login")
    
    print("deleting all videos")

    videodir = "uploads/"
    for video in os.listdir(videodir):
        os.remove(os.path.join(videodir, video))

    print("videos deleted")

    return redirect("/all_links")

@app.route("/task3")
def task3():
    return render_template("task3.html")



# Root page -----------------------------

@app.route("/login", methods=["GET","POST"])
def login():

    if request.method == "POST":
        pwhash = hashlib.sha256(request.form["password"].encode('utf-8')).hexdigest()
        if pwhash == PASSWORD:
            session["logged_in"] = True
            return redirect(url_for("all_links"))

    return render_template("login.html")
    

@app.route("/logout")
def logout():
    session["logged_in"] = False
    return redirect("/")

def has_no_empty_params(rule):
    defaults = rule.defaults if rule.defaults is not None else ()
    arguments = rule.arguments if rule.arguments is not None else ()
    return len(defaults) >= len(arguments)

@app.route("/")
def root():
    return redirect("/start")

@app.route("/all_links")
def all_links():
    links = []
    for rule in app.url_map.iter_rules():
        # Filter out rules we can't navigate to in a browser
        # and rules that require parameters
        if "GET" in rule.methods and has_no_empty_params(rule):
            url = url_for(rule.endpoint, **(rule.defaults or {}))
            links.append((url, rule.endpoint))
    return render_template("all_links.html", links=links)

# delete all tables as last link  --------------------------

# Route to delete all entries
#@app.route('/delete_json_tables', methods=['GET'])
def delete_json_tables():
    try:
        meta = db.metadata
        meta.reflect(db.engine)
        for table in reversed(meta.sorted_tables):  # Iterate through tables in reverse order to handle foreign key constraints
            if table.name != "user" and table.name != "response":
                print("Deleting Table: {name}".format(name=table.name))
                db.session.execute(table.delete())

        db.session.commit()
        return 'All entries deleted successfully'
    except Exception as e:
        # Rollback changes if any error occurs
        db.session.rollback()
        return f'Error occurred: {str(e)}', 500
    finally:
        # Close the session
        db.session.close()


# Route to delete all entries
@app.route('/delete_all_entries', methods=['GET'])
def delete_all_entries():
    if not session.get("logged_in"):
        return redirect("/login")
    # here I could also use a "drop_all()", that works jsut like create all from the creation part
    # this together with the reflect could drop actually all tables
    try:
        meta = db.metadata
        for table in reversed(meta.sorted_tables):  # Iterate through tables in reverse order to handle foreign key constraints
            db.session.execute(table.delete())
        db.session.commit()
        return 'All entries deleted successfully'
    except Exception as e:
        # Rollback changes if any error occurs
        db.session.rollback()
        return f'Error occurred: {str(e)}', 500
    finally:
        # Close the session
        db.session.close()

def create_app():
    return app

if __name__ == '__main__':
    app.run()