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import mimetypes
import os
import tempfile
from html import escape
from pathlib import Path
from string import Template
import PyPDF2
import requests
import streamlit as st
from dotenv import load_dotenv
load_dotenv()
# LlamaIndex imports for RAG retrieval
try:
from llama_index.core import Settings, StorageContext, load_index_from_storage
from llama_index.embeddings.huggingface import HuggingFaceEmbedding
LLAMA_INDEX_AVAILABLE = True
except ImportError:
LLAMA_INDEX_AVAILABLE = False
# GitHub repo that hosts study materials via Releases + manifest.json
# Format: "owner/repo"
MATERIALS_REPO = os.getenv("MATERIALS_REPO", "KunalGupta25/plexi-materials")
MANIFEST_BRANCH = "main"
THEME_MODE_STATE_KEY = "plexi_theme_mode"
THEME_MODE_WIDGET_KEY = "_plexi_theme_mode_widget"
APP_ICON_PATH = str(Path(__file__).resolve().with_name("plexi-mcp-square-logo.svg"))
LIGHT_PALETTE = {
"ink": "#16312c",
"muted": "#5b6c66",
"bg": "#f5f0e8",
"panel": "rgba(255, 252, 247, 0.88)",
"panel_strong": "#fffaf1",
"line": "rgba(22, 49, 44, 0.11)",
"accent": "#1d7a63",
"accent_soft": "#d7efe4",
"highlight": "#f4b860",
"shadow": "0 18px 60px rgba(30, 48, 43, 0.08)",
"app_background": """
radial-gradient(circle at top left, rgba(244, 184, 96, 0.18), transparent 28%),
radial-gradient(circle at top right, rgba(29, 122, 99, 0.14), transparent 30%),
linear-gradient(180deg, #fbf7ef 0%, #f4ecde 100%)
""",
"hero_background": """
linear-gradient(135deg, rgba(29, 122, 99, 0.08), rgba(255, 250, 241, 0.92)),
rgba(255, 252, 247, 0.88)
""",
"chip_background": "rgba(29, 122, 99, 0.08)",
"chip_border": "rgba(29, 122, 99, 0.12)",
"button_border": "rgba(29, 122, 99, 0.14)",
"button_surface": "#f8fbfa",
"button_hover": "#eef7f2",
"primary_button": "linear-gradient(135deg, #1d7a63, #245e74)",
"sidebar_background": """
linear-gradient(180deg, rgba(255, 251, 245, 0.98), rgba(246, 238, 224, 0.96))
""",
"expander_background": "rgba(255, 251, 245, 0.72)",
"meta_background": "rgba(255, 251, 245, 0.72)",
"divider": "linear-gradient(90deg, rgba(29, 122, 99, 0.25), transparent)",
"meta_row_border": "rgba(22, 49, 44, 0.08)",
"bottom_background": "#fbf7ef",
}
DARK_PALETTE = {
"ink": "#eef4ef",
"muted": "#b8c6c0",
"bg": "#0d1715",
"panel": "rgba(20, 31, 29, 0.9)",
"panel_strong": "#15211f",
"line": "rgba(196, 223, 211, 0.14)",
"accent": "#54c6a2",
"accent_soft": "#17392f",
"highlight": "#f0b564",
"shadow": "0 22px 70px rgba(0, 0, 0, 0.32)",
"app_background": """
radial-gradient(circle at top left, rgba(240, 181, 100, 0.12), transparent 28%),
radial-gradient(circle at top right, rgba(84, 198, 162, 0.12), transparent 32%),
linear-gradient(180deg, #0f1b19 0%, #09110f 100%)
""",
"hero_background": """
linear-gradient(135deg, rgba(84, 198, 162, 0.12), rgba(16, 28, 25, 0.92)),
rgba(20, 31, 29, 0.9)
""",
"chip_background": "rgba(84, 198, 162, 0.12)",
"chip_border": "rgba(84, 198, 162, 0.18)",
"button_border": "rgba(84, 198, 162, 0.18)",
"button_surface": "rgba(84, 198, 162, 0.14)",
"button_hover": "rgba(84, 198, 162, 0.22)",
"primary_button": "linear-gradient(135deg, #2ea483, #245e74)",
"sidebar_background": """
linear-gradient(180deg, rgba(17, 28, 26, 0.98), rgba(12, 20, 18, 0.97))
""",
"expander_background": "rgba(17, 28, 26, 0.84)",
"meta_background": "rgba(19, 31, 28, 0.84)",
"divider": "linear-gradient(90deg, rgba(84, 198, 162, 0.32), transparent)",
"meta_row_border": "rgba(196, 223, 211, 0.1)",
"bottom_background": "#09110f",
}
def get_theme_mode():
"""Return the selected appearance mode."""
if THEME_MODE_STATE_KEY not in st.session_state:
st.session_state[THEME_MODE_STATE_KEY] = "system"
return st.session_state[THEME_MODE_STATE_KEY]
def sync_theme_mode():
"""Persist the appearance selector value across page switches."""
st.session_state[THEME_MODE_STATE_KEY] = st.session_state.get(
THEME_MODE_WIDGET_KEY, "System"
).lower()
def _css_vars_block(palette):
"""Return CSS custom property definitions for a palette."""
return "\n".join(
[
f" --plexi-ink: {palette['ink']};",
f" --plexi-muted: {palette['muted']};",
f" --plexi-bg: {palette['bg']};",
f" --plexi-panel: {palette['panel']};",
f" --plexi-panel-strong: {palette['panel_strong']};",
f" --plexi-line: {palette['line']};",
f" --plexi-accent: {palette['accent']};",
f" --plexi-accent-soft: {palette['accent_soft']};",
f" --plexi-highlight: {palette['highlight']};",
f" --plexi-shadow: {palette['shadow']};",
f" --plexi-app-background: {palette['app_background']};",
f" --plexi-hero-background: {palette['hero_background']};",
f" --plexi-chip-background: {palette['chip_background']};",
f" --plexi-chip-border: {palette['chip_border']};",
f" --plexi-button-border: {palette['button_border']};",
f" --plexi-button-surface: {palette['button_surface']};",
f" --plexi-button-hover: {palette['button_hover']};",
f" --plexi-primary-button: {palette['primary_button']};",
f" --plexi-sidebar-background: {palette['sidebar_background']};",
f" --plexi-expander-background: {palette['expander_background']};",
f" --plexi-meta-background: {palette['meta_background']};",
f" --plexi-divider: {palette['divider']};",
f" --plexi-meta-row-border: {palette['meta_row_border']};",
f" --plexi-bottom-background: {palette['bottom_background']};",
]
)
def inject_theme():
"""Inject the shared visual language for the Streamlit app."""
theme_mode = get_theme_mode()
palette = DARK_PALETTE if theme_mode == "dark" else LIGHT_PALETTE
system_css = ""
color_scheme = "dark" if theme_mode == "dark" else "light"
if theme_mode == "system":
system_css = f"""
@media (prefers-color-scheme: dark) {{
:root {{
{_css_vars_block(DARK_PALETTE)}
}}
html {{
color-scheme: dark;
}}
}}
"""
css = Template(
"""
<style>
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=Space+Grotesk:wght@400;500;700&display=swap');
:root {
$palette_vars
}
html, body, [class*="css"] {
font-family: "Space Grotesk", "Segoe UI", sans-serif;
}
html {
color-scheme: $color_scheme;
}
.stApp {
background: var(--plexi-app-background);
color: var(--plexi-ink);
}
header[data-testid="stHeader"] {
background: transparent !important;
}
div[data-testid="stToolbar"] {
background: transparent !important;
}
div[data-testid="stAppViewContainer"] {
background: transparent;
}
.block-container {
padding-top: 2.2rem;
padding-bottom: 3rem;
}
h1, h2, h3 {
color: var(--plexi-ink);
}
h1, .plexi-title {
font-family: "DM Serif Display", Georgia, serif;
letter-spacing: -0.03em;
}
p, li, .stMarkdown, .stCaption, .stChatMessage {
color: var(--plexi-ink);
}
.plexi-hero,
.plexi-panel,
.plexi-stat,
.plexi-sidecard,
.plexi-callout {
background: var(--plexi-panel);
border: 1px solid var(--plexi-line);
border-radius: 24px;
box-shadow: var(--plexi-shadow);
}
.plexi-hero {
padding: 1.8rem 1.9rem;
margin-bottom: 1.1rem;
background: var(--plexi-hero-background);
}
.plexi-kicker {
text-transform: uppercase;
letter-spacing: 0.16em;
font-size: 0.72rem;
font-weight: 700;
color: var(--plexi-accent);
margin-bottom: 0.65rem;
}
.plexi-title {
font-size: clamp(2.2rem, 5vw, 4.2rem);
margin: 0;
line-height: 0.95;
}
.plexi-subtitle {
max-width: 48rem;
margin: 0.8rem 0 0;
color: var(--plexi-muted);
font-size: 1rem;
line-height: 1.65;
}
.plexi-chip-row {
display: flex;
gap: 0.55rem;
flex-wrap: wrap;
margin-top: 1rem;
}
.plexi-chip {
display: inline-flex;
align-items: center;
gap: 0.35rem;
padding: 0.45rem 0.8rem;
border-radius: 999px;
background: var(--plexi-chip-background);
border: 1px solid var(--plexi-chip-border);
font-size: 0.82rem;
color: var(--plexi-ink);
}
.plexi-panel,
.plexi-callout,
.plexi-sidecard {
padding: 1.15rem 1.2rem;
margin-bottom: 1rem;
}
.plexi-stat {
padding: 1rem 1.15rem;
min-height: 8.5rem;
overflow: hidden;
}
.plexi-stat-label {
color: var(--plexi-muted);
font-size: 0.82rem;
text-transform: uppercase;
letter-spacing: 0.08em;
}
.plexi-stat-value {
font-family: "DM Serif Display", Georgia, serif;
font-size: clamp(1.5rem, 2.1vw, 2.1rem);
line-height: 1.08;
margin: 0.35rem 0 0.4rem;
overflow-wrap: anywhere;
}
.plexi-stat-note,
.plexi-muted {
color: var(--plexi-muted);
font-size: 0.92rem;
line-height: 1.55;
}
.plexi-section-label {
margin: 1.6rem 0 0.8rem;
text-transform: uppercase;
letter-spacing: 0.12em;
color: var(--plexi-accent);
font-size: 0.74rem;
font-weight: 700;
}
.plexi-list {
margin: 0;
padding-left: 1rem;
color: var(--plexi-muted);
line-height: 1.7;
}
.plexi-cta-grid {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 1rem;
margin: 1rem 0 1.4rem;
align-items: stretch;
}
.plexi-cta-button {
display: flex;
align-items: center;
justify-content: center;
width: 100%;
min-height: 3.6rem;
padding: 0.9rem 1.2rem;
border-radius: 999px;
text-decoration: none !important;
font-weight: 700;
font-size: 1.02rem;
color: #ffffff !important;
background: linear-gradient(135deg, #3bb192, #2b728a);
box-shadow: 0 16px 40px rgba(38, 109, 107, 0.22);
border: none;
transition: transform 120ms ease, box-shadow 120ms ease, opacity 120ms ease;
}
.plexi-cta-button:hover {
color: #ffffff !important;
transform: translateY(-1px);
box-shadow: 0 18px 44px rgba(38, 109, 107, 0.28);
}
.plexi-prompt button,
.stButton > button,
.stDownloadButton > button,
.stLinkButton > a {
border-radius: 999px !important;
}
.stButton > button,
.stDownloadButton > button,
.stLinkButton > a {
border: 1px solid var(--plexi-button-border);
min-height: 2.85rem;
background: var(--plexi-button-surface);
color: var(--plexi-ink) !important;
box-shadow: none !important;
}
.stButton > button[kind="primary"],
.stDownloadButton > button[kind="primary"] {
background: var(--plexi-primary-button);
color: white;
border: none;
}
.stLinkButton > a {
display: flex;
align-items: center;
justify-content: center;
text-decoration: none !important;
}
.stLinkButton > a:hover,
.stButton > button:hover,
.stDownloadButton > button:hover {
border-color: var(--plexi-accent);
background: var(--plexi-button-hover);
color: var(--plexi-ink) !important;
}
.stButton > button:disabled,
.stDownloadButton > button:disabled,
.stLinkButton > a[disabled] {
opacity: 0.55;
color: var(--plexi-muted) !important;
}
.stTextInput input,
.stSelectbox [data-baseweb="select"] > div,
.stTextArea textarea,
.stChatInput textarea {
background: var(--plexi-panel-strong) !important;
color: var(--plexi-ink) !important;
border-color: var(--plexi-line) !important;
}
.stSelectbox [data-baseweb="select"] *,
.stTextInput input::placeholder,
.stTextArea textarea::placeholder,
.stChatInput textarea::placeholder {
color: var(--plexi-muted) !important;
}
div[data-baseweb="select"] svg,
div[data-baseweb="select"] path {
color: var(--plexi-accent) !important;
fill: var(--plexi-accent) !important;
}
.stChatInputContainer,
div[data-testid="stChatMessage"] {
border-radius: 22px;
}
div[data-testid="stBottomBlockContainer"],
div[data-testid="stBottomBlockContainer"] > div,
div[data-testid="stBottomBlockContainer"] > div > div,
div[data-testid="stChatInput"],
div[data-testid="stChatInput"] > div,
div[data-testid="stChatInput"] form,
div[data-testid="stChatInput"] form > div,
.stChatInputContainer {
background: var(--plexi-bottom-background) !important;
}
div[data-testid="stChatInput"] {
border-top: none !important;
padding-top: 0.5rem;
}
div[data-testid="stChatInput"] textarea,
div[data-testid="stChatInput"] section,
div[data-testid="stChatInput"] [data-baseweb="textarea"] {
background: var(--plexi-panel-strong) !important;
color: var(--plexi-ink) !important;
border-color: var(--plexi-line) !important;
}
div[data-testid="stChatInput"] button {
background: var(--plexi-panel-strong) !important;
color: var(--plexi-accent) !important;
border: 1px solid var(--plexi-button-border) !important;
}
div[data-testid="stChatInput"] button svg,
div[data-testid="stChatInput"] button path {
fill: currentColor !important;
}
div[data-testid="stSidebar"],
div[data-testid="stSidebar"] > div,
section[data-testid="stSidebar"] {
background: var(--plexi-sidebar-background);
border-right: 1px solid var(--plexi-line);
}
div[data-testid="stSidebar"] .block-container {
padding-top: 1.2rem;
}
div[data-testid="stSidebarNav"],
div[data-testid="stSidebarNav"] ul,
div[data-testid="stSidebarNav"] li,
div[data-testid="stSidebarUserContent"] {
background: transparent !important;
}
div[data-testid="stSidebarNav"] a,
div[data-testid="stSidebarNav"] span,
div[data-testid="stSidebarNav"] button {
color: var(--plexi-ink) !important;
}
div[data-testid="stSidebarNav"] a:hover {
background: rgba(255, 255, 255, 0.04);
}
div[data-testid="stExpander"] {
border-radius: 18px;
border-color: var(--plexi-line);
background: var(--plexi-expander-background);
}
div[data-testid="stToast"] {
background: var(--plexi-panel-strong) !important;
color: var(--plexi-ink) !important;
border: 1px solid var(--plexi-line) !important;
box-shadow: var(--plexi-shadow) !important;
}
div[data-testid="toastContainer"] * {
color: var(--plexi-ink) !important;
}
div[data-testid="stSpinner"] > div,
div[data-testid="stSpinner"] * {
color: var(--plexi-ink) !important;
}
div[data-baseweb="popover"],
div[data-baseweb="popover"] > div,
div[data-baseweb="popover"] > div > div,
div[data-baseweb="popover"] > div > div > div,
div[data-baseweb="menu"],
div[data-baseweb="menu"] > div,
div[role="listbox"],
ul[role="listbox"] {
background: var(--plexi-panel-strong) !important;
color: var(--plexi-ink) !important;
border: 1px solid var(--plexi-line) !important;
box-shadow: var(--plexi-shadow) !important;
}
div[data-baseweb="popover"] *,
div[data-baseweb="menu"] *,
div[role="listbox"] *,
ul[role="listbox"] * {
color: var(--plexi-ink) !important;
}
div[data-baseweb="popover"] ul,
div[data-baseweb="popover"] li,
div[data-baseweb="popover"] li > div,
div[data-baseweb="menu"] ul,
div[data-baseweb="menu"] li,
div[data-baseweb="menu"] li > div {
background: var(--plexi-panel-strong) !important;
}
li[role="option"],
li[role="option"] > div,
li[role="option"] * {
background: transparent !important;
color: var(--plexi-ink) !important;
}
li[role="option"]:hover,
li[role="option"]:hover > div,
li[role="option"]:hover *,
li[role="option"][aria-selected="true"] {
background: var(--plexi-accent-soft) !important;
color: var(--plexi-ink) !important;
}
li[role="option"][aria-selected="true"] > div,
li[role="option"][aria-selected="true"] * {
background: var(--plexi-accent-soft) !important;
color: var(--plexi-ink) !important;
}
.plexi-sidecard-title {
font-family: "DM Serif Display", Georgia, serif;
font-size: 1.25rem;
margin-bottom: 0.35rem;
}
.plexi-meta {
background: var(--plexi-meta-background);
border: 1px solid var(--plexi-line);
border-radius: 18px;
padding: 0.85rem 1rem;
margin-bottom: 1rem;
}
.plexi-meta-row {
display: flex;
justify-content: space-between;
gap: 1rem;
align-items: flex-start;
padding: 0.65rem 0;
border-bottom: 1px solid var(--plexi-meta-row-border);
}
.plexi-meta-row:last-child {
border-bottom: none;
padding-bottom: 0;
}
.plexi-meta-row:first-child {
padding-top: 0;
}
.plexi-meta-key {
color: var(--plexi-muted);
font-size: 0.78rem;
text-transform: uppercase;
letter-spacing: 0.08em;
flex: 0 0 38%;
}
.plexi-meta-value {
text-align: right;
color: var(--plexi-ink);
font-size: 0.96rem;
line-height: 1.5;
overflow-wrap: anywhere;
}
.plexi-filelist {
margin: 0;
padding-left: 1.1rem;
color: var(--plexi-muted);
line-height: 1.7;
}
.plexi-filelist li.current {
color: var(--plexi-ink);
font-weight: 600;
}
.plexi-divider {
height: 1px;
background: var(--plexi-divider);
margin: 1rem 0 1.1rem;
}
$system_css
@media (max-width: 900px) {
.block-container {
padding-top: 1.2rem;
}
.plexi-hero {
padding: 1.35rem 1.2rem;
border-radius: 20px;
}
.plexi-stat {
min-height: 0;
}
.plexi-meta-row {
display: block;
}
.plexi-meta-value {
text-align: left;
margin-top: 0.2rem;
}
.plexi-cta-grid {
grid-template-columns: 1fr;
}
}
</style>
"""
).substitute(
{
"palette_vars": _css_vars_block(palette),
"color_scheme": color_scheme,
"system_css": system_css,
}
)
st.markdown(css, unsafe_allow_html=True)
def summarize_manifest(manifest):
"""Return top-level counts for the materials catalog."""
subject_total = sum(len(subjects) for subjects in manifest.values())
file_total = sum(
len(files)
for subjects in manifest.values()
for types in subjects.values()
for files in types.values()
)
material_types = sorted(
{
material_type
for subjects in manifest.values()
for types in subjects.values()
for material_type in types.keys()
}
)
return {
"semester_count": len(manifest),
"subject_count": subject_total,
"file_count": file_total,
"material_types": material_types,
}
def summarize_subject_catalog(subject_data):
"""Return counts for one selected subject catalog."""
return {
"type_count": len(subject_data),
"file_count": sum(len(files) for files in subject_data.values()),
"types": sorted(subject_data.keys()),
}
def render_page_header(kicker, title, subtitle, badges=None):
"""Render a shared hero block for each page."""
badge_html = ""
if badges:
badge_html = "".join(
f'<span class="plexi-chip">{escape(str(badge))}</span>'
for badge in badges
if badge
)
badge_html = f'<div class="plexi-chip-row">{badge_html}</div>'
st.markdown(
f"""
<section class="plexi-hero">
<div class="plexi-kicker">{escape(kicker)}</div>
<h1 class="plexi-title">{escape(title)}</h1>
<p class="plexi-subtitle">{escape(subtitle)}</p>
{badge_html}
</section>
""",
unsafe_allow_html=True,
)
def render_stat_cards(cards):
"""Render compact metrics in a responsive grid."""
if not cards:
return
cols = st.columns(len(cards))
for col, card in zip(cols, cards):
label = escape(str(card.get("label", "")))
value = escape(str(card.get("value", "")))
note = escape(str(card.get("note", "")))
with col:
st.markdown(
f"""
<div class="plexi-stat">
<div class="plexi-stat-label">{label}</div>
<div class="plexi-stat-value">{value}</div>
<div class="plexi-stat-note">{note}</div>
</div>
""",
unsafe_allow_html=True,
)
def render_panel(title, body, tone="default"):
"""Render a simple informational panel."""
panel_class = "plexi-callout" if tone == "callout" else "plexi-panel"
st.markdown(
f"""
<section class="{panel_class}">
<div class="plexi-sidecard-title">{escape(title)}</div>
<div class="plexi-muted">{escape(body)}</div>
</section>
""",
unsafe_allow_html=True,
)
def _manifest_url():
"""Raw GitHub URL for manifest.json."""
return f"https://raw.githubusercontent.com/{MATERIALS_REPO}/{MANIFEST_BRANCH}/manifest.json"
@st.cache_data(ttl=300, show_spinner=False)
def get_manifest():
"""Fetch the materials manifest from GitHub. Cached for 5 minutes."""
url = _manifest_url()
resp = requests.get(url, timeout=15)
resp.raise_for_status()
return resp.json()
def download_github_file(download_url, max_retries=3):
"""Download a file from a GitHub Release asset URL with retry logic."""
for attempt in range(max_retries):
try:
resp = requests.get(download_url, timeout=60)
resp.raise_for_status()
return resp.content
except requests.RequestException as err:
print(f"Download error (attempt {attempt + 1}): {err}")
if attempt == max_retries - 1:
raise
return None
def get_mime_type(filename):
"""Guess MIME type from filename extension."""
mime, _ = mimetypes.guess_type(filename)
return mime or "application/octet-stream"
# ── Lightweight Office → PDF conversion (pure Python) ──────────────────
#
# Uses python-pptx / python-docx to extract content and fpdf2 to render
# PDF pages. No system packages (LibreOffice, etc.) required.
# The output is a readable *preview*, not a pixel-perfect replica.
def _pptx_to_pdf(file_bytes):
"""Convert PPTX bytes to PDF bytes using python-pptx + fpdf2."""
from pptx import Presentation as PptxPresentation
from pptx.util import Emu
from fpdf import FPDF
prs = PptxPresentation(io.BytesIO(file_bytes))
# Slide dimensions in mm (default is 10" × 7.5")
slide_w_mm = prs.slide_width / Emu(914400) * 25.4 # EMU → inches → mm
slide_h_mm = prs.slide_height / Emu(914400) * 25.4
pdf = FPDF(orientation="L", unit="mm", format=(slide_h_mm, slide_w_mm))
pdf.set_auto_page_break(auto=True, margin=12)
# Use built-in Helvetica (no font file needed)
TITLE_SIZE = 18
BODY_SIZE = 11
MARGIN = 14
for slide_idx, slide in enumerate(prs.slides, start=1):
pdf.add_page()
pdf.set_left_margin(MARGIN)
pdf.set_right_margin(MARGIN)
pdf.set_y(MARGIN)
# ── Slide number chip ──
pdf.set_font("Helvetica", "I", 8)
pdf.set_text_color(120, 120, 120)
pdf.cell(0, 5, f"Slide {slide_idx}", ln=True)
pdf.ln(2)
# ── Extract text from shapes ──
title_text = ""
body_parts = []
for shape in slide.shapes:
if shape.has_text_frame:
for para in shape.text_frame.paragraphs:
text = para.text.strip()
if not text:
continue
# Heuristic: first non-empty text in a title placeholder
if not title_text and hasattr(shape, "placeholder_format"):
ph = shape.placeholder_format
if ph is not None and ph.idx in (0, 1):
title_text = text
continue
body_parts.append(text)
# ── Embedded images ──
if shape.shape_type == 13: # MSO_SHAPE_TYPE.PICTURE
try:
img_bytes = shape.image.blob
img_stream = io.BytesIO(img_bytes)
# Scale image to fit page width (with margins)
max_w = slide_w_mm - 2 * MARGIN
pdf.image(img_stream, x=MARGIN, w=min(max_w, 120))
pdf.ln(4)
except Exception:
pass # skip unreadable images
# ── Render title ──
if title_text:
pdf.set_font("Helvetica", "B", TITLE_SIZE)
pdf.set_text_color(22, 49, 44) # plexi-ink dark
pdf.multi_cell(0, TITLE_SIZE * 0.5, title_text)
pdf.ln(4)
# ── Render body text ──
if body_parts:
pdf.set_font("Helvetica", "", BODY_SIZE)
pdf.set_text_color(50, 50, 50)
for part in body_parts:
pdf.multi_cell(0, BODY_SIZE * 0.45, part)
pdf.ln(2)
if len(prs.slides) == 0:
pdf.add_page()
pdf.set_font("Helvetica", "I", 12)
pdf.cell(0, 10, "This presentation has no slides.", ln=True)
return bytes(pdf.output())
def _docx_to_pdf(file_bytes):
"""Convert DOCX bytes to PDF bytes using python-docx + fpdf2."""
from docx import Document as DocxDocument
from fpdf import FPDF
doc = DocxDocument(io.BytesIO(file_bytes))
pdf = FPDF(orientation="P", unit="mm", format="A4")
pdf.set_auto_page_break(auto=True, margin=15)
pdf.add_page()
MARGIN = 16
pdf.set_left_margin(MARGIN)
pdf.set_right_margin(MARGIN)
HEADING_SIZES = {"Heading 1": 20, "Heading 2": 16, "Heading 3": 14}
BODY_SIZE = 11
for para in doc.paragraphs:
text = para.text.strip()
if not text:
pdf.ln(3)
continue
style_name = para.style.name if para.style else ""
if style_name in HEADING_SIZES:
size = HEADING_SIZES[style_name]
pdf.set_font("Helvetica", "B", size)
pdf.set_text_color(22, 49, 44)
pdf.ln(4)
pdf.multi_cell(0, size * 0.5, text)
pdf.ln(3)
else:
is_bold = any(
run.bold for run in para.runs if run.bold is not None
)
pdf.set_font("Helvetica", "B" if is_bold else "", BODY_SIZE)
pdf.set_text_color(50, 50, 50)
pdf.multi_cell(0, BODY_SIZE * 0.45, text)
pdf.ln(1.5)
# ── Inline images ──
for rel in doc.part.rels.values():
if "image" in rel.reltype:
try:
img_stream = io.BytesIO(rel.target_part.blob)
pdf.image(img_stream, x=MARGIN, w=100)
pdf.ln(4)
except Exception:
pass
return bytes(pdf.output())
def convert_office_to_pdf(file_bytes, filename):
"""Convert an Office document (PPTX/DOCX/PPT/DOC) to PDF bytes.
Uses pure-Python libraries (python-pptx, python-docx, fpdf2) so no
system packages like LibreOffice are needed. The output is a readable
preview rather than a pixel-perfect replica.
Returns
-------
bytes | None
PDF bytes on success, or ``None`` on failure.
"""
ext = Path(filename).suffix.lower()
try:
if ext in (".pptx", ".ppt"):
return _pptx_to_pdf(file_bytes)
elif ext in (".docx", ".doc"):
return _docx_to_pdf(file_bytes)
except Exception as err:
print(f"Office-to-PDF conversion error ({filename}): {err}")
return None
def render_sidebar_intro():
"""Render the shared sidebar intro card."""
with st.sidebar:
st.markdown(
"""
<section class="plexi-sidecard">
<div class="plexi-kicker">Plexi</div>
<div class="plexi-sidecard-title">Grounded study assistant</div>
<div class="plexi-muted">
Browse materials, preview files, and ask questions backed by the
currently loaded course content.
</div>
</section>
""",
unsafe_allow_html=True,
)
def render_sidebar_footer():
"""Render shared appearance controls and outbound links at the end of the sidebar."""
with st.sidebar:
current_mode = get_theme_mode()
widget_value = current_mode.capitalize()
if st.session_state.get(THEME_MODE_WIDGET_KEY) != widget_value:
st.session_state[THEME_MODE_WIDGET_KEY] = widget_value
st.markdown(
'<div class="plexi-section-label">Appearance</div>',
unsafe_allow_html=True,
)
st.selectbox(
"Theme",
["System", "Light", "Dark"],
key=THEME_MODE_WIDGET_KEY,
on_change=sync_theme_mode,
help="System follows your device preference unless you override it here.",
)
st.caption("Built by **Kunal Gupta** (LazyHuman)")
cols = st.columns(3)
with cols[0]:
st.link_button("Web", "https://lazyhideout.tech", use_container_width=True)
with cols[1]:
st.link_button(
"GitHub", "https://github.com/kunalgupta25", use_container_width=True
)
with cols[2]:
st.link_button(
"Ko-fi", "https://ko-fi.com/lazy_human", use_container_width=True
)
st.markdown('<div class="plexi-divider"></div>', unsafe_allow_html=True)
def render_sidebar():
"""Render the shared sidebar for pages without extra sidebar sections."""
render_sidebar_intro()
render_sidebar_footer()
def read_pdf_text(pdf_bytes):
"""Extract text from PDF bytes with error handling."""
text = []
try:
reader = PyPDF2.PdfReader(io.BytesIO(pdf_bytes))
for page in reader.pages:
try:
page_text = page.extract_text()
if page_text:
filtered = page_text.encode("utf-16", "surrogatepass").decode(
"utf-16", "ignore"
)
text.append(filtered)
except Exception:
pass
return "\n".join(text)
except Exception:
return pdf_bytes.decode("utf-8", errors="ignore") if pdf_bytes else ""
def load_subject_context(manifest, semester, subject):
"""Download and extract text from all files for a given semester + subject.
Returns (context_string, source_list) where:
- context_string: numbered source blocks for the system prompt
- source_list: list of dicts with 'id', 'name', 'type' for citation display
"""
subject_data = manifest.get(semester, {}).get(subject, {})
parts = []
sources = []
source_id = 0
for file_type, file_list in subject_data.items():
for file_entry in file_list:
name = file_entry["name"]
mime = get_mime_type(name)
if not (mime.startswith("text/") or mime == "application/pdf"):
continue
try:
content = download_github_file(file_entry["download_url"])
if not content:
continue
if mime == "application/pdf":
text = read_pdf_text(content)
else:
text = content.decode("utf-8", errors="ignore")
if text.strip():
source_id += 1
sources.append({"id": source_id, "name": name, "type": file_type})
parts.append(
f"[Source {source_id}: {name} ({file_type})]\n{text}\n[End Source {source_id}]"
)
except Exception as err:
print(f"Error loading {name}: {err}")
return "\n\n".join(parts), sources
# RAG index loading from GitHub
# The index is pre-built by GitHub Actions (build_index.py) and
# committed to the materials repo. We just download and load it.
EMBED_MODEL_ID = "sentence-transformers/all-MiniLM-L6-v2" # must match build_index.py
INDEX_FILES = [
"default__vector_store.json",
"docstore.json",
"graph_store.json",
"image__vector_store.json",
"index_store.json",
]
@st.cache_resource(show_spinner="Loading RAG index...")
def fetch_rag_index():
"""
Download the pre-built LlamaIndex from the materials repo and return
a ready-to-use VectorStoreIndex. Cached once per Streamlit session.
Returns (index, error_msg) - index is None if loading failed.
"""
if not LLAMA_INDEX_AVAILABLE:
return (
None,
"LlamaIndex not installed - install llama-index-core and dependencies.",
)
index_base_url = (
f"https://raw.githubusercontent.com/{MATERIALS_REPO}/{MANIFEST_BRANCH}/index"
)
index_dir = tempfile.mkdtemp(prefix="plexi_index_")
try:
for filename in INDEX_FILES:
url = f"{index_base_url}/{filename}"
resp = requests.get(url, timeout=30)
resp.raise_for_status()
with open(os.path.join(index_dir, filename), "wb") as file_handle:
file_handle.write(resp.content)
except Exception as err:
return None, f"Failed to download index files: {err}"
try:
embed_model = HuggingFaceEmbedding(model_name=EMBED_MODEL_ID)
Settings.embed_model = embed_model
Settings.llm = None
storage_context = StorageContext.from_defaults(persist_dir=index_dir)
index = load_index_from_storage(storage_context)
return index, None
except Exception as err:
return None, f"Failed to load index: {err}"
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