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Gradio Blocks layout for the DSA Tutor Chatbot.
Custom layout only (per spec) — no gr.ChatInterface. Structure:
Top bar: title, auth status, Login/Logout buttons
Sign-up dialog (modal-ish accordion, opened via a "Sign up" link)
Main row:
[ Toggleable history panel ] [ Chat window + input + send/new chat ]
Streaming: the assistant's reply is revealed progressively via
ui.callbacks.stream_last_response (see that module's docstring for why
it's simulated rather than a true token stream).
"""
import gradio as gr
from ui import callbacks
from ui.theme import CUSTOM_CSS, dsa_theme
def build_ui(flask_app) -> gr.Blocks:
callbacks.init_app(flask_app)
with gr.Blocks(theme=dsa_theme, css=CUSTOM_CSS, title="DSA Tutor Chatbot") as demo:
auth_state = gr.State(None) # {"user_id":.., "email":..} | None
session_state = gr.State(None) # active ChatSession.id | None
anon_history = gr.State([]) # rolling history for anonymous users
history_visible_state = gr.State(False) # tracks History panel visibility
# ---------------------------------------------------------------
# Top bar
# ---------------------------------------------------------------
with gr.Row(elem_id="topbar"):
gr.Markdown("### 🧮 DSA Tutor Chatbot", elem_id="topbar-title")
with gr.Row(elem_id="topbar-actions"):
auth_status_md = gr.Markdown("Not logged in", elem_id="auth-status")
history_toggle_btn = gr.Button("📜 History", size="sm", scale=0, elem_classes=["small-btn"])
login_btn = gr.Button("Log in", size="sm", scale=0, elem_classes=["small-btn"])
signup_btn = gr.Button("Sign up", size="sm", scale=0, elem_classes=["small-btn"])
logout_btn = gr.Button("Log out", size="sm", scale=0, visible=False, elem_classes=["small-btn"])
# ---------------------------------------------------------------
# Login popover
# ---------------------------------------------------------------
with gr.Group(visible=False) as login_panel:
gr.Markdown("#### Log in")
login_email = gr.Textbox(label="Email")
login_password = gr.Textbox(label="Password", type="password")
with gr.Row():
login_submit = gr.Button("Log in", variant="primary", size="sm", elem_classes=["small-btn"])
login_cancel = gr.Button("Cancel", size="sm", elem_classes=["small-btn"])
login_status = gr.Markdown("")
# ---------------------------------------------------------------
# Sign-up dialog
# ---------------------------------------------------------------
with gr.Group(visible=False) as signup_panel:
gr.Markdown("#### Create an account")
signup_email = gr.Textbox(label="Email")
signup_password = gr.Textbox(label="Password (min 8 characters)", type="password")
with gr.Row():
signup_submit = gr.Button("Sign up", variant="primary", size="sm", elem_classes=["small-btn"])
signup_cancel = gr.Button("Cancel", size="sm", elem_classes=["small-btn"])
signup_status = gr.Markdown("")
# ---------------------------------------------------------------
# Main area: history panel (toggleable) + chat
# ---------------------------------------------------------------
with gr.Row(elem_id="main-row"):
with gr.Column(scale=1, visible=False, elem_id="history-panel") as history_panel:
gr.Markdown("**Previous sessions**")
session_list = gr.Radio(choices=[], label="", elem_classes=["session-item"])
with gr.Row():
refresh_sessions_btn = gr.Button("Refresh", size="sm", elem_classes=["small-btn"])
delete_session_btn = gr.Button("Delete selected", size="sm", elem_classes=["small-btn"])
with gr.Column(scale=4, elem_id="chat-column"):
chatbot = gr.Chatbot(
label="DSA Tutor",
type="messages",
height=360,
elem_id="chat-window",
avatar_images=(None, None),
)
with gr.Row(elem_id="input-row"):
msg_box = gr.Textbox(
placeholder="Ask about any DSA topic (e.g. 'Explain merge sort')...",
show_label=False,
scale=8,
)
send_btn = gr.Button("Send", variant="primary", scale=1, size="sm")
new_chat_btn = gr.Button("🆕 New chat", size="sm", elem_classes=["small-btn"])
# ---------------------------------------------------------------
# Wiring: top bar toggles
# ---------------------------------------------------------------
def _toggle_history(is_visible):
new_visible = not is_visible
return new_visible, gr.update(visible=new_visible)
history_toggle_btn.click(
_toggle_history,
inputs=[history_visible_state],
outputs=[history_visible_state, history_panel],
)
login_btn.click(lambda: gr.update(visible=True), outputs=login_panel)
login_cancel.click(lambda: gr.update(visible=False), outputs=login_panel)
signup_btn.click(lambda: gr.update(visible=True), outputs=signup_panel)
signup_cancel.click(lambda: gr.update(visible=False), outputs=signup_panel)
def _auth_ui_update(auth_state_value):
if auth_state_value:
status = f"Logged in as **{auth_state_value['email']}**"
return (
status,
gr.update(visible=False), # login_btn
gr.update(visible=False), # signup_btn
gr.update(visible=True), # logout_btn
)
return (
"Not logged in",
gr.update(visible=True),
gr.update(visible=True),
gr.update(visible=False),
)
def _on_login(email, password):
auth_state_value, message, is_error = callbacks.do_login(email, password)
status_md, login_show, signup_show, logout_show = _auth_ui_update(auth_state_value)
panel_visible = gr.update(visible=is_error)
return auth_state_value, status_md, login_show, signup_show, logout_show, panel_visible, message
login_submit.click(
_on_login,
inputs=[login_email, login_password],
outputs=[auth_state, auth_status_md, login_btn, signup_btn, logout_btn, login_panel, login_status],
)
def _on_signup(email, password):
auth_state_value, message, is_error = callbacks.do_signup(email, password)
status_md, login_show, signup_show, logout_show = _auth_ui_update(auth_state_value)
panel_visible = gr.update(visible=is_error)
return auth_state_value, status_md, login_show, signup_show, logout_show, panel_visible, message
signup_submit.click(
_on_signup,
inputs=[signup_email, signup_password],
outputs=[auth_state, auth_status_md, login_btn, signup_btn, logout_btn, signup_panel, signup_status],
)
def _on_logout():
auth_state_value, message, _ = callbacks.do_logout()
status_md, login_show, signup_show, logout_show = _auth_ui_update(auth_state_value)
return auth_state_value, status_md, login_show, signup_show, logout_show, [], None, []
logout_btn.click(
_on_logout,
outputs=[
auth_state, auth_status_md, login_btn, signup_btn, logout_btn,
chatbot, session_state, anon_history,
],
)
# ---------------------------------------------------------------
# Wiring: chat
# ---------------------------------------------------------------
def _send_and_stream(user_message, chat_display, auth_state_value, session_state_value, anon_hist):
chat_display, session_state_value, anon_hist, cleared = callbacks.send_message(
user_message, chat_display, auth_state_value, session_state_value, anon_hist
)
for partial in callbacks.stream_last_response(chat_display):
yield partial, session_state_value, anon_hist, cleared
send_btn.click(
_send_and_stream,
inputs=[msg_box, chatbot, auth_state, session_state, anon_history],
outputs=[chatbot, session_state, anon_history, msg_box],
)
msg_box.submit(
_send_and_stream,
inputs=[msg_box, chatbot, auth_state, session_state, anon_history],
outputs=[chatbot, session_state, anon_history, msg_box],
)
new_chat_btn.click(
callbacks.new_chat,
outputs=[chatbot, session_state, anon_history],
)
# ---------------------------------------------------------------
# Wiring: history panel
# ---------------------------------------------------------------
refresh_sessions_btn.click(
callbacks.refresh_sessions,
inputs=[auth_state],
outputs=[session_list],
)
session_list.change(
callbacks.open_session,
inputs=[session_list, auth_state],
outputs=[chatbot, session_state],
)
delete_session_btn.click(
callbacks.delete_session,
inputs=[session_list, auth_state],
outputs=[chatbot, session_state],
).then(
callbacks.refresh_sessions,
inputs=[auth_state],
outputs=[session_list],
)
# Refresh the session list whenever a login/signup succeeds.
auth_state.change(
callbacks.refresh_sessions,
inputs=[auth_state],
outputs=[session_list],
)
return demo |