src/app.py

import streamlit as st
from utils.metrics_data import load_metrics
from utils.model_loader import model_is_available

st.set_page_config(
    page_title="SentiMart - Analisis Sentimen E-Commerce",
    page_icon="🛍️",
    layout="wide",
    initial_sidebar_state="expanded",
)

# ---------- Global style ----------
st.markdown("""
<style>
    .block-container { padding-top: 2rem; }
    .stat-card {
        background: #ffffff; border: 1px solid #eaecef; border-radius: 12px;
        padding: 1.1rem 1.3rem; text-align: left;
    }
    .stat-value { font-size: 1.9rem; font-weight: 700; color: #16213e; }
    .stat-label { font-size: 0.85rem; color: #6b7280; font-weight: 600; }
    .stat-sub { font-size: 0.78rem; color: #9aa0a6; }
    .feature-card {
        background: #ffffff; border: 1px solid #eaecef; border-radius: 12px;
        padding: 1.2rem 1.3rem; height: 100%;
    }
    .feature-title { font-weight: 700; font-size: 1.02rem; color: #16213e; margin-bottom: 0.3rem; }
    .feature-desc { font-size: 0.85rem; color: #6b7280; }
    .badge-model {
        display: inline-block; background: #eef2ff; color: #4338ca;
        padding: 0.25rem 0.7rem; border-radius: 20px; font-size: 0.78rem; font-weight: 600;
    }
</style>
""", unsafe_allow_html=True)

with st.sidebar:
    st.markdown("### 🛍️ SentiMart")
    st.caption("v1.0")
    st.markdown("---")
    if model_is_available():
        st.success("Model IndoBERT: siap")
    else:
        st.warning("Mode DEMO (model belum di-load)")

metrics = load_metrics()

status = "" if not metrics.get("is_demo") else " · demo data"
st.markdown('<span class="badge-model">🤖 IndoBERT · fine-tuned' + status + '</span>', unsafe_allow_html=True)
st.markdown("## SentiMart")
st.markdown("#### Analisis Sentimen Ulasan E-Commerce Indonesia")
st.write(
    "Platform analisis sentimen berbasis deep learning untuk ulasan produk "
    "e-commerce berbahasa Indonesia. Dibangun dengan model **IndoBERT** yang "
    "di-fine-tune pada dataset **PRDECT-ID** (5.400 ulasan nyata)."
)

st.write("")
c1, c2, c3 = st.columns(3)
with c1:
    st.markdown(
        '<div class="stat-card"><div class="stat-value">5,400</div>'
        '<div class="stat-label">Total Ulasan</div>'
        '<div class="stat-sub">Dataset PRDECT-ID</div></div>',
        unsafe_allow_html=True,
    )
with c2:
    st.markdown(
        f'<div class="stat-card"><div class="stat-value">{metrics["accuracy"]*100:.1f}%</div>'
        '<div class="stat-label">Akurasi Model</div>'
        '<div class="stat-sub">Test set evaluation</div></div>',
        unsafe_allow_html=True,
    )
with c3:
    st.markdown(
        '<div class="stat-card"><div class="stat-value">2</div>'
        '<div class="stat-label">Kelas Sentimen</div>'
        '<div class="stat-sub">Positif &amp; Negatif</div></div>',
        unsafe_allow_html=True,
    )

st.write("")
st.markdown("##### FITUR APLIKASI")
r1c1, r1c2 = st.columns(2)
with r1c1:
    st.markdown(
        '<div class="feature-card"><div class="feature-title">🔍 Prediksi Sentimen</div>'
        '<div class="feature-desc">Analisis sentimen satu ulasan produk secara real-time '
        'menggunakan model IndoBERT terlatih.</div></div>',
        unsafe_allow_html=True,
    )
with r1c2:
    st.markdown(
        '<div class="feature-card"><div class="feature-title">📊 Analisis Batch</div>'
        '<div class="feature-desc">Unggah file CSV berisi banyak ulasan dan dapatkan hasil '
        'prediksi sentimen secara massal.</div></div>',
        unsafe_allow_html=True,
    )

st.write("")
r2c1, r2c2 = st.columns(2)
with r2c1:
    st.markdown(
        '<div class="feature-card"><div class="feature-title">📈 Performa Model</div>'
        '<div class="feature-desc">Lihat metrik evaluasi model: akurasi, precision, recall, '
        'F1-Score, dan kurva pelatihan.</div></div>',
        unsafe_allow_html=True,
    )
with r2c2:
    st.markdown(
        '<div class="feature-card"><div class="feature-title">ℹ️ Tentang Aplikasi</div>'
        '<div class="feature-desc">Informasi dataset, metodologi penelitian, dan tim '
        'pengembang aplikasi SentiMart.</div></div>',
        unsafe_allow_html=True,
    )

st.write("")
st.caption("SentiMart · Indonesia · 2026 — Proyek Akhir Praktikum NLP, Politeknik Caltex Riau")