import flet as ft
import requests

def register_teacher_page(page: ft.Page):
    page.clean()
    page.title = "Register Page"
    page.theme_mode = ft.ThemeMode.LIGHT 
    
    subjects_list = []
    row = ft.Row()  

    # UI components
    username_field = ft.TextField(label="Benutzername")
    first_name_field = ft.TextField(label="Vorname")
    last_name_field = ft.TextField(label="Nachname")
    password_field0 = ft.TextField(label="Passwort", password=True, can_reveal_password=True)
    password_field1 = ft.TextField(label="Passwort bestätigen", password=True, can_reveal_password=True)
    secret_teacher_password_field = ft.TextField(label="Secret Teacher Password", password=True, can_reveal_password=True)
    info_label = ft.Text("", theme_style=ft.TextThemeStyle.TITLE_SMALL)
    
    def delete_subject(dropdown, delete_button):
        if dropdown.value in subjects_list:
            subjects_list.remove(dropdown.value)
        row.controls.remove(dropdown)
        row.controls.remove(delete_button)
        page.update()
        refresh_dropdowns()
    
    def append_subject(e=None, dropdown=None, plus_button=None):
        if not dropdown.value or dropdown.value in subjects_list or dropdown.value == "Wähle deine Fächer aus":
            dropdown.value = ""  # Reset if empty or duplicate
            page.update()
            return
        
        subjects_list.append(dropdown.value)
        
        # Disable current dropdown and button after selection
        dropdown.disabled = True
        plus_button.visible = False

        # Add new dropdown to the same row
        add_new_dropdown()

        page.update()
        
    def on_dropdown_change(e, dropdown, plus_button):
        if dropdown.value and dropdown.value not in subjects_list and dropdown.value != "Wähle deine Fächer aus":
            subjects_list.append(dropdown.value)
            dropdown.disabled = True
            plus_button.visible = False
            add_new_dropdown()
        page.update()
            
    def refresh_dropdowns():
        for control in row.controls:
            if isinstance(control, ft.Dropdown) and not control.disabled:
                available_subjects = get_available_subjects()
                control.options = [
                    ft.dropdown.Option("Wähle deine Fächer aus", disabled=True)
                ] + [
                    ft.dropdown.Option(subj) for subj in available_subjects
                ]
        page.update()
    
    def get_available_subjects():
        available_subjects = [
            "De", "En", "Fr", "Gs", "Ma", "NW", "Re", "Sn", "Sp", "Wn"
        ]
        return [subj for subj in available_subjects if subj not in subjects_list]

    def add_new_dropdown():
        options = [
            ft.dropdown.Option("Wähle deine Fächer aus", disabled=True)
        ] + [
            ft.dropdown.Option(subj) for subj in get_available_subjects()
        ]
        
        dropdown = ft.Dropdown(
            width=250,
            options=options,
            value="Wähle deine Fächer aus",
            on_change=lambda e: on_dropdown_change(e, dropdown, plus_button)
        )
        
        plus_button = ft.IconButton(
            icon=ft.icons.ADD,
            visible=False  # Initially hidden
        )
        
        delete_button = ft.IconButton(
            icon=ft.icons.CLOSE_OUTLINED,
            on_click=lambda e: delete_subject(dropdown, delete_button)
        )
        
        plus_button.on_click = lambda e: append_subject(e, dropdown, plus_button)

        # Add dropdown and buttons to the row
        row.controls.append(dropdown)
        row.controls.append(plus_button)
        row.controls.append(delete_button)
        page.update()
        
    def register(e):
        print(subjects_list)
        username = username_field.value.strip()
        password0 = password_field0.value.strip()
        password1 = password_field1.value.strip()
        secret_teacher_password = secret_teacher_password_field.value.strip()
        last_name = last_name_field.value.strip()
        first_name = first_name_field.value.strip()
        
        subjects_string = ", ".join(subjects_list)
        
        if not username or not password0 or not secret_teacher_password or not password1 or not last_name or not first_name or not subjects_string:
            info_label.value = "Bitte fülle alle Felder aus"
            info_label.color = "red"
            page.update()
            #page.clean()
            #register_teacher_page(page=page)
            return
        
        if not password0 == password1:
            info_label.value = "Passwörter stimmen nicht überein"
            info_label.color = "red"
            page.update()
            return

        try: 
            url = 'http://awesom-o.org:8000/teacher/register'
            headers = {
                'accept': 'application/json',
                'Content-Type': 'application/json'
            }
            data = {
                'username': username,
                'password': password0,
                'teacher_secret_password': secret_teacher_password,
                'first_name': first_name,
                'last_name': last_name,
                'subjects': subjects_string
            }

            response = requests.post(url, headers=headers, json=data)

            if response.status_code == 200:
                session_id = response.json().get("session_id")
                username = response.json().get("username")
                page.session.set("access_token", session_id)
                page.session.set("username", username)
                page.go("/")
            
            else:
                error_message = response.json().get("detail", "Registrierung fehlgeschlagen")
                info_label.value = error_message
                info_label.color = "red"
        except requests.exceptions.RequestException as e:
            info_label.value = f"An error occurred: {str(e)}"
            info_label.color = "red"

        page.update()

    page.add(
            ft.Text("Daltonraum-Buchungssystem der IGS Garbsen", size=30),
            ft.Text("Registrieren", size=23, weight=ft.FontWeight.BOLD),
            username_field,
            ft.Row([
                first_name_field,
                last_name_field
                    ]),
            row,
            password_field0,
            password_field1,
            secret_teacher_password_field,
            ft.ElevatedButton("Registrieren", on_click=register),
            info_label,
            ft.TextButton("Kein Lehrer? Klicke hier!", on_click=lambda _: page.go("/register_student"))
        )

    add_new_dropdown()