src/streamlit_app.py

import streamlit as st
import pandas as pd
import numpy as np
import altair as alt 
from sklearn.preprocessing import StandardScaler


st.set_page_config(page_title="SPK Pemilihan Cabang untuk Lokasi Coffeeshop", layout="wide")

st.title("📊 Sistem Pendukung Keputusan Pemilihan Cabang untuk Lokasi Coffeeshop")
st.markdown("Metode: AHP, TOPSIS, dan Profile Matching")

# --- Step 1: Pilih Metode ---
st.sidebar.header("⚙ Pengaturan")
method = st.selectbox("🧠 Pilih Metode", ["None","TOPSIS", "Profile Matching", "AHP"], key="selected_method")

# ---------------------------
if method == "AHP":
        # --- Setup Kriteria (TANPA COST/BENEFIT) ---
    st.sidebar.subheader("📝 Manajemen Kriteria")
    
    # Default kriteria (struktur disederhanakan)
    default_criteria = [
        {"name": "Building Area"},
        {"name": "Road Access"},
        {"name": "Distance"},
        {"name": "Rental Price"}
    ]
    
    # Initialize session state untuk kriteria
    if 'criteria_list' not in st.session_state:
        st.session_state.criteria_list = default_criteria.copy()
    
    # Initialize pairwise comparison matrix in session state
    if 'pairwise_matrix' not in st.session_state:
        st.session_state.pairwise_matrix = {}
    
    # Fungsi untuk menambah kriteria (disesuaikan)
    def add_criterion():
        # Hanya mengambil nama kriteria
        new_criterion = {
            "name": st.session_state.new_criterion_name
        }
        # Logika sisanya tetap sama
        if new_criterion["name"] and new_criterion["name"] not in [c["name"] for c in st.session_state.criteria_list]:
            st.session_state.criteria_list.append(new_criterion)
            st.session_state.new_criterion_name = ""
            st.session_state.pairwise_matrix = {}
    
    # Fungsi untuk menghapus kriteria (tidak ada perubahan)
    def remove_criterion(idx):
        if len(st.session_state.criteria_list) > 1:
            st.session_state.criteria_list.pop(idx)
            st.session_state.pairwise_matrix = {}
    
    # Form untuk menambah kriteria baru (input tipe dihapus)
    with st.sidebar.expander("➕ Tambah Kriteria Baru"):
        st.text_input("Nama Kriteria", key="new_criterion_name", placeholder="Masukkan nama kriteria")
        # Tombol selectbox untuk tipe kriteria DIHAPUS
        st.button("Tambah Kriteria", on_click=add_criterion)
    
    # Tampilkan daftar kriteria yang ada (tampilan disederhanakan)
    st.sidebar.subheader("📋 Daftar Kriteria")
    for i, criterion in enumerate(st.session_state.criteria_list):
        # Menggunakan layout 2 kolom, sama seperti alternatif
        col1, col2 = st.sidebar.columns([4, 1])
        with col1:
            # Menghapus format tebal dan miring agar konsisten
            st.write(criterion['name'])
        with col2:
            # Kolom untuk tipe kriteria  DIHAPUS
            if st.button("🗑", key=f"remove_{i}", help="Hapus kriteria"):
                remove_criterion(i)
                st.rerun()
    
    # Extract nama kriteria (variabel criteria_types DIHAPUS)
    criteria = [c["name"] for c in st.session_state.criteria_list]
    # criteria_types = {c["name"]: c["type"] for c in st.session_state.criteria_list} # <-- BARIS INI DIHAPUS
    
    # --- Setup Alternatif (tidak ada perubahan) ---
    st.sidebar.subheader("🏢 Manajemen Alternatif")
    
    default_alternatives = [
        {"name": "Location 1"},
        {"name": "Location 2"},
        {"name": "Location 3"},
        {"name": "Location 4"}
    ]
    
    if 'alternatives_list' not in st.session_state:
        st.session_state.alternatives_list = default_alternatives.copy()
    
    def add_alternative():
        new_alternative = {"name": st.session_state.new_alternative_name}
        if new_alternative["name"] and new_alternative["name"] not in [a["name"] for a in st.session_state.alternatives_list]:
            st.session_state.alternatives_list.append(new_alternative)
            st.session_state.new_alternative_name = ""
    
    def remove_alternative(idx):
        if len(st.session_state.alternatives_list) > 1:
            st.session_state.alternatives_list.pop(idx)
    
    with st.sidebar.expander("➕ Tambah Alternatif Baru"):
        st.text_input("Nama Alternatif", key="new_alternative_name", placeholder="Masukkan nama alternatif")
        st.button("Tambah Alternatif", on_click=add_alternative)
    
    st.sidebar.subheader("📋 Daftar Alternatif")
    for i, alternative in enumerate(st.session_state.alternatives_list):
        col1, col2 = st.sidebar.columns([4, 1])
        with col1:
            st.write(alternative['name'])
        with col2:
            if st.button("🗑", key=f"remove_alt_{i}", help="Hapus alternatif"):
                remove_alternative(i)
                st.rerun()
    
    alternatives = [a["name"] for a in st.session_state.alternatives_list]
    
    if not criteria or not alternatives:
        st.warning("Masukkan minimal satu kriteria dan alternatif.")
        st.stop()
    st.subheader("🔗 Perbandingan Berpasangan Antar Kriteria (AHP)")

    # Create improved pairwise comparison matrix
    st.markdown("""
    Petunjuk Pengisian:
    - Nilai 1 = Sama penting
    - Nilai 3 = Sedikit lebih penting
    - Nilai 5 = Lebih penting
    - Nilai 7 = Sangat lebih penting
    - Nilai 9 = Mutlak lebih penting
    - Nilai 2,4,6,8 = Nilai tengah
    - Dapat menggunakan desimal (contoh: 1.5, 2.5, dll)
    """)

    # Create pairwise comparison table
    n_criteria = len(criteria)

    # Initialize matrix if not exists
    matrix_key = f"criteria_matrix_{len(criteria)}"
    if matrix_key not in st.session_state.pairwise_matrix:
        st.session_state.pairwise_matrix[matrix_key] = np.ones((n_criteria, n_criteria))

    # Create the comparison matrix display
    st.markdown("### Matriks Perbandingan Berpasangan")

    # Create input fields for upper triangular matrix
    comparison_matrix = st.session_state.pairwise_matrix[matrix_key].copy()

    # First, collect all upper triangular inputs
    upper_triangular_inputs = {}

    # Create table for displaying the matrix
    for i in range(n_criteria):
        cols = st.columns(n_criteria + 1)

        # Row header
        with cols[0]:
            st.write(f"{criteria[i]}")

        for j in range(n_criteria):
            with cols[j + 1]:
                if i == j:
                    # Diagonal elements are always 1
                    st.write("1.0")
                elif i < j:
                    # Upper triangular - allow number input
                    key = f"comparison_{i}_{j}"
                    comparison_value = st.number_input(
                        f"{criteria[i]} vs {criteria[j]}",
                        min_value=0.1,
                        max_value=9.0,
                        value=float(comparison_matrix[i, j]),
                        step=0.1,
                        key=key,
                        label_visibility="collapsed"
                    )
                    upper_triangular_inputs[(i, j)] = comparison_value
                else:
                    # Lower triangular - show reciprocal
                    # Get the corresponding upper triangular value
                    upper_value = upper_triangular_inputs.get((j, i), comparison_matrix[j, i])
                    reciprocal_value = 1.0 / upper_value if upper_value != 0 else 1.0
                    st.write(f"{reciprocal_value:.3f}")

    # Update the matrix with all values
    for (i, j), value in upper_triangular_inputs.items():
        comparison_matrix[i, j] = value
        comparison_matrix[j, i] = 1.0 / value

    # Update session state
    st.session_state.pairwise_matrix[matrix_key] = comparison_matrix

    # Display the complete matrix
    st.markdown("### Matriks Lengkap")
    matrix_df = pd.DataFrame(comparison_matrix, index=criteria, columns=criteria)
    st.dataframe(matrix_df.round(3), use_container_width=True)

    # Calculate AHP weights
    try:
        # Calculate normalized matrix
        column_sums = comparison_matrix.sum(axis=0)
        normalized_matrix = comparison_matrix / column_sums

        # Calculate criteria weights
        weights_ahp_criteria = normalized_matrix.mean(axis=1)
        weights_ahp_criteria = pd.Series(weights_ahp_criteria, index=criteria)

        st.write("🎯 Bobot Kriteria dari AHP:")
        weights_df = weights_ahp_criteria.round(3).to_frame(name="Bobot AHP")
        st.dataframe(weights_df)

        # Consistency check
        RI = {1: 0.00, 2: 0.00, 3: 0.58, 4: 0.90, 5: 1.12, 6: 1.24, 7: 1.32, 8: 1.41, 9: 1.45, 10: 1.49}
        n = len(criteria)

        # Calculate λ_max
        weighted_sum = comparison_matrix.dot(weights_ahp_criteria)
        lambda_max = (weighted_sum / weights_ahp_criteria).mean()

        # Calculate CI and CR
        CI = (lambda_max - n) / (n - 1) if n > 1 else 0
        CR = CI / RI.get(n, 1) if n in RI and RI[n] > 0 else 0

        st.subheader("✅ Analisis Konsistensi")
        col1, col2, col3 = st.columns(3)
        with col1:
            st.metric("λ max", f"{lambda_max:.3f}")
        with col2:
            st.metric("CI", f"{CI:.3f}")
        with col3:
            st.metric("CR", f"{CR:.3f}")

        if CR < 0.1:
            st.success("✅ Konsistensi Rasio BAIK (CR < 0.1)")
        else:
            st.error("❌ Konsistensi Rasio BURUK (CR ≥ 0.1). Harap sesuaikan perbandingan.")

    except Exception as e:
        st.error(f"Error dalam perhitungan AHP: {e}")

    # Alternative pairwise comparisons for each criterion
    st.subheader("🔗 Perbandingan Berpasangan Antar Alternatif")

    alternative_weights_per_criterion = {}

    for criterion in criteria:
        with st.expander(f"Perbandingan untuk Kriteria: {criterion}"):
            st.markdown(f"Bandingkan alternatif berdasarkan {criterion}")

            n_alternatives = len(alternatives)
            alt_matrix_key = f"alt_matrix_{criterion}_{n_alternatives}"

            # Initialize alternative matrix
            if alt_matrix_key not in st.session_state.pairwise_matrix:
                st.session_state.pairwise_matrix[alt_matrix_key] = np.ones((n_alternatives, n_alternatives))

            alt_comparison_matrix = st.session_state.pairwise_matrix[alt_matrix_key].copy()

            # Create comparison inputs
            alt_upper_triangular_inputs = {}

            for i in range(n_alternatives):
                cols = st.columns(n_alternatives + 1)

                with cols[0]:
                    st.write(f"{alternatives[i]}")

                for j in range(n_alternatives):
                    with cols[j + 1]:
                        if i == j:
                            st.write("1.0")
                        elif i < j:
                            key = f"alt_comparison_{criterion}{i}{j}"
                            comparison_value = st.number_input(
                                f"{alternatives[i]} vs {alternatives[j]}",
                                min_value=0.1,
                                max_value=9.0,
                                value=float(alt_comparison_matrix[i, j]),
                                step=0.1,
                                key=key,
                                label_visibility="collapsed"
                            )
                            alt_upper_triangular_inputs[(i, j)] = comparison_value
                        else:
                            # Lower triangular - show reciprocal
                            upper_value = alt_upper_triangular_inputs.get((j, i), alt_comparison_matrix[j, i])
                            reciprocal_value = 1.0 / upper_value if upper_value != 0 else 1.0
                            st.write(f"{reciprocal_value:.3f}")

            # Update the alternative matrix with all values
            for (i, j), value in alt_upper_triangular_inputs.items():
                alt_comparison_matrix[i, j] = value
                alt_comparison_matrix[j, i] = 1.0 / value

            # Update session state
            st.session_state.pairwise_matrix[alt_matrix_key] = alt_comparison_matrix

            # Calculate alternative weights for this criterion
            try:
                alt_column_sums = alt_comparison_matrix.sum(axis=0)
                alt_normalized_matrix = alt_comparison_matrix / alt_column_sums
                alt_weights = alt_normalized_matrix.mean(axis=1)
                alt_weights_series = pd.Series(alt_weights, index=alternatives)
                alternative_weights_per_criterion[criterion] = alt_weights_series

                st.write(f"Bobot alternatif untuk {criterion}:")
                st.dataframe(alt_weights_series.round(3).to_frame(name="Bobot"))

            except Exception as e:
                st.error(f"Error menghitung bobot alternatif untuk {criterion}: {e}")
                
elif method == "None":
    st.subheader("Pilih Metode terlebih dahulu")

elif method == "TOPSIS":
        # --- Setup Kriteria dengan Tipe ---
    st.sidebar.subheader("📝 Manajemen Kriteria")
    
    # Default kriteria
    default_criteria = [
        {"name": "Building Area (m2)", "type": "benefit"},
        {"name": "Road Access (m)", "type": "benefit"},
        {"name": "Distance (m)", "type": "benefit"},
        {"name": "Rental Price (jt Rp)", "type": "cost"}
    ]
    
    # Initialize session state untuk kriteria
    if 'criteria_list' not in st.session_state:
        st.session_state.criteria_list = default_criteria.copy()
    
    # Initialize pairwise comparison matrix in session state
    if 'pairwise_matrix' not in st.session_state:
        st.session_state.pairwise_matrix = {}
    
    # Fungsi untuk menambah kriteria
    def add_criterion():
        new_criterion = {
            "name": st.session_state.new_criterion_name,
            "type": st.session_state.new_criterion_type
        }
        if new_criterion["name"] and new_criterion["name"] not in [c["name"] for c in st.session_state.criteria_list]:
            st.session_state.criteria_list.append(new_criterion)
            st.session_state.new_criterion_name = ""
            # Reset pairwise matrix when criteria change
            st.session_state.pairwise_matrix = {}
    
    # Fungsi untuk menghapus kriteria
    def remove_criterion(idx):
        if len(st.session_state.criteria_list) > 1:  # Minimal 1 kriteria
            st.session_state.criteria_list.pop(idx)
            # Reset pairwise matrix when criteria change
            st.session_state.pairwise_matrix = {}
    
    # Form untuk menambah kriteria baru
    with st.sidebar.expander("➕ Tambah Kriteria Baru"):
        st.text_input("Nama Kriteria", key="new_criterion_name", placeholder="Masukkan nama kriteria")
        st.selectbox("Tipe Kriteria", ["benefit", "cost"], key="new_criterion_type",
                    help="Benefit = semakin tinggi semakin baik, Cost = semakin rendah semakin baik")
        st.button("Tambah Kriteria", on_click=add_criterion)
    
    # Tampilkan daftar kriteria yang ada
    st.sidebar.subheader("📋 Daftar Kriteria")
    for i, criterion in enumerate(st.session_state.criteria_list):
        col1, col2, col3 = st.sidebar.columns([3, 2, 1])
        with col1:
            st.write(f"{criterion['name']}")
        with col2:
            badge_color = "🟢" if criterion['type'] == 'benefit' else "🔴"
            st.write(f"{badge_color} {criterion['type']}")
        with col3:
            if st.button("🗑", key=f"remove_{i}", help="Hapus kriteria"):
                remove_criterion(i)
                st.rerun()
    
    # Extract nama kriteria dan tipe
    criteria = [c["name"] for c in st.session_state.criteria_list]
    criteria_types = {c["name"]: c["type"] for c in st.session_state.criteria_list}
    
    # --- Setup Alternatif ---
    st.sidebar.subheader("🏢 Manajemen Alternatif")
    
    # Default alternatif
    default_alternatives = [
        {"name": "Location 1"},
        {"name": "Location 2"},
        {"name": "Location 3"},
        {"name": "Location 4"}
    ]
    
    # Initialize session state untuk alternatif
    if 'alternatives_list' not in st.session_state:
        st.session_state.alternatives_list = default_alternatives.copy()
    
    # Fungsi untuk menambah alternatif
    def add_alternative():
        new_alternative = {"name": st.session_state.new_alternative_name}
        if new_alternative["name"] and new_alternative["name"] not in [a["name"] for a in st.session_state.alternatives_list]:
            st.session_state.alternatives_list.append(new_alternative)
            st.session_state.new_alternative_name = ""
    
    # Fungsi untuk menghapus alternatif
    def remove_alternative(idx):
        if len(st.session_state.alternatives_list) > 1:  # Minimal 1 alternatif
            st.session_state.alternatives_list.pop(idx)
    
    # Form untuk menambah alternatif baru
    with st.sidebar.expander("➕ Tambah Alternatif Baru"):
        st.text_input("Nama Alternatif", key="new_alternative_name", placeholder="Masukkan nama alternatif")
        st.button("Tambah Alternatif", on_click=add_alternative)
    
    # Tampilkan daftar alternatif yang ada
    st.sidebar.subheader("📋 Daftar Alternatif")
    for i, alternative in enumerate(st.session_state.alternatives_list):
        col1, col2 = st.sidebar.columns([4, 1])
        with col1:
            st.write(f"{alternative['name']}")
        with col2:
            if st.button("🗑", key=f"remove_alt_{i}", help="Hapus alternatif"):
                remove_alternative(i)
                st.rerun()
    
    # Extract nama alternatif
    alternatives = [a["name"] for a in st.session_state.alternatives_list]
    
    if not criteria or not alternatives:
        st.warning("Masukkan minimal satu kriteria dan alternatif.")
        st.stop()
    
    # Tampilkan ringkasan kriteria
    st.subheader("📊 Ringkasan Kriteria")
    criteria_df = pd.DataFrame(st.session_state.criteria_list)
    criteria_df.index = criteria_df.index + 1
    st.dataframe(criteria_df, use_container_width=True)
    
    # TOPSIS implementation
    st.subheader("📋 Input Nilai Alternatif terhadap Kriteria")
    empty_data = pd.DataFrame(np.nan, index=alternatives, columns=criteria)
    df = st.data_editor(empty_data, use_container_width=True, key="input_matrix")
    if df.isnull().values.any():
        st.warning("⚠ Harap lengkapi semua nilai pada tabel sebelum menjalankan perhitungan untuk TOPSIS/Profile Matching.")
        
    # Add Standard Scaler option
    st.subheader("⚙️ Pengaturan Normalisasi")
    use_standard_scaler = st.checkbox("Gunakan Standard Scaler", value=False,
                                     help="Standard Scaler akan menormalisasi data dengan mean=0 dan std=1")
    
    st.subheader("⚖ Bobot Kriteria (Manual)")
    weight_dict = {}
    cols = st.columns(len(criteria))
    for i, c in enumerate(criteria):
        with cols[i]:
            weight_dict[c] = st.number_input(f"Bobot untuk '{c}' (1-10)", min_value=0.0, max_value=10.0, value=1.0, step=0.1, key=f"weight_{c}")

    types = np.array([1 if criteria_types[c] == "benefit" else 0 for c in criteria])
    weights = np.array([weight_dict[c] for c in criteria])
    weights /= weights.sum()

    st.write("🎯 Ringkasan Kriteria dan Bobot:")
    summary_df = pd.DataFrame({
        "Kriteria": criteria,
        "Tipe": [criteria_types[c] for c in criteria],
        "Bobot (Ternormalisasi)": weights.round(3)
    })
    st.dataframe(summary_df, use_container_width=True)

else:
    # Profile Matching implementation
        # --- Setup Kriteria dengan Tipe ---
    st.sidebar.subheader("📝 Manajemen Kriteria")
    
    # Default kriteria
    default_criteria = [
        {"name": "Building Area (m2)", "type": "benefit"},
        {"name": "Road Access (m)", "type": "benefit"},
        {"name": "Distance (m)", "type": "benefit"},
        {"name": "Rental Price (jt Rp)", "type": "cost"}
    ]
    
    # Initialize session state untuk kriteria
    if 'criteria_list' not in st.session_state:
        st.session_state.criteria_list = default_criteria.copy()
    
    # Initialize pairwise comparison matrix in session state
    if 'pairwise_matrix' not in st.session_state:
        st.session_state.pairwise_matrix = {}
    
    # Fungsi untuk menambah kriteria
    def add_criterion():
        new_criterion = {
            "name": st.session_state.new_criterion_name,
            "type": st.session_state.new_criterion_type
        }
        if new_criterion["name"] and new_criterion["name"] not in [c["name"] for c in st.session_state.criteria_list]:
            st.session_state.criteria_list.append(new_criterion)
            st.session_state.new_criterion_name = ""
            # Reset pairwise matrix when criteria change
            st.session_state.pairwise_matrix = {}
    
    # Fungsi untuk menghapus kriteria
    def remove_criterion(idx):
        if len(st.session_state.criteria_list) > 1:  # Minimal 1 kriteria
            st.session_state.criteria_list.pop(idx)
            # Reset pairwise matrix when criteria change
            st.session_state.pairwise_matrix = {}
    
    # Form untuk menambah kriteria baru
    with st.sidebar.expander("➕ Tambah Kriteria Baru"):
        st.text_input("Nama Kriteria", key="new_criterion_name", placeholder="Masukkan nama kriteria")
        st.selectbox("Tipe Kriteria", ["benefit", "cost"], key="new_criterion_type",
                    help="Benefit = semakin tinggi semakin baik, Cost = semakin rendah semakin baik")
        st.button("Tambah Kriteria", on_click=add_criterion)
    
    # Tampilkan daftar kriteria yang ada
    st.sidebar.subheader("📋 Daftar Kriteria")
    for i, criterion in enumerate(st.session_state.criteria_list):
        col1, col2, col3 = st.sidebar.columns([3, 2, 1])
        with col1:
            st.write(f"{criterion['name']}")
        with col2:
            badge_color = "🟢" if criterion['type'] == 'benefit' else "🔴"
            st.write(f"{badge_color} {criterion['type']}")
        with col3:
            if st.button("🗑", key=f"remove_{i}", help="Hapus kriteria"):
                remove_criterion(i)
                st.rerun()
    
    # Extract nama kriteria dan tipe
    criteria = [c["name"] for c in st.session_state.criteria_list]
    criteria_types = {c["name"]: c["type"] for c in st.session_state.criteria_list}
    
    # --- Setup Alternatif ---
    st.sidebar.subheader("🏢 Manajemen Alternatif")
    
    # Default alternatif
    default_alternatives = [
        {"name": "Location 1"},
        {"name": "Location 2"},
        {"name": "Location 3"},
        {"name": "Location 4"}
    ]
    
    # Initialize session state untuk alternatif
    if 'alternatives_list' not in st.session_state:
        st.session_state.alternatives_list = default_alternatives.copy()
    
    # Fungsi untuk menambah alternatif
    def add_alternative():
        new_alternative = {"name": st.session_state.new_alternative_name}
        if new_alternative["name"] and new_alternative["name"] not in [a["name"] for a in st.session_state.alternatives_list]:
            st.session_state.alternatives_list.append(new_alternative)
            st.session_state.new_alternative_name = ""
    
    # Fungsi untuk menghapus alternatif
    def remove_alternative(idx):
        if len(st.session_state.alternatives_list) > 1:  # Minimal 1 alternatif
            st.session_state.alternatives_list.pop(idx)
    
    # Form untuk menambah alternatif baru
    with st.sidebar.expander("➕ Tambah Alternatif Baru"):
        st.text_input("Nama Alternatif", key="new_alternative_name", placeholder="Masukkan nama alternatif")
        st.button("Tambah Alternatif", on_click=add_alternative)
    
    # Tampilkan daftar alternatif yang ada
    st.sidebar.subheader("📋 Daftar Alternatif")
    for i, alternative in enumerate(st.session_state.alternatives_list):
        col1, col2 = st.sidebar.columns([4, 1])
        with col1:
            st.write(f"{alternative['name']}")
        with col2:
            if st.button("🗑", key=f"remove_alt_{i}", help="Hapus alternatif"):
                remove_alternative(i)
                st.rerun()
    
    # Extract nama alternatif
    alternatives = [a["name"] for a in st.session_state.alternatives_list]
    
    if not criteria or not alternatives:
        st.warning("Masukkan minimal satu kriteria dan alternatif.")
        st.stop()
    
    # Tampilkan ringkasan kriteria
    st.subheader("📊 Ringkasan Kriteria")
    criteria_df = pd.DataFrame(st.session_state.criteria_list)
    criteria_df.index = criteria_df.index + 1
    st.dataframe(criteria_df, use_container_width=True)
    
    st.subheader("📋 Input Nilai Alternatif terhadap Kriteria")
    empty_data = pd.DataFrame(np.nan, index=alternatives, columns=criteria)
    df = st.data_editor(empty_data, use_container_width=True, key="input_matrix")
    if df.isnull().values.any():
        st.warning("⚠ Harap lengkapi semua nilai pada tabel sebelum menjalankan perhitungan untuk TOPSIS/Profile Matching.")

    # Add Standard Scaler option for Profile Matching
    st.subheader("⚙️ Pengaturan Normalisasi")
    use_standard_scaler_pm = st.checkbox("Gunakan Standard Scaler", value=False,
                                        help="Standard Scaler akan menormalisasi data dengan mean=0 dan std=1")

    st.subheader("🎯 Ideal Profile (untuk Profile Matching)")
    ideal_profile_dict = {}
    cols = st.columns(len(criteria))
    for i, c in enumerate(criteria):
        with cols[i]:
            ideal_profile_dict[c] = st.number_input(f"Ideal '{c}' ", min_value=1, max_value=2000, value=3, key=f"ideal_{c}")
    ideal_profile = pd.Series(ideal_profile_dict, index=criteria)
    
    st.write("💡 Profil Ideal:")
    ideal_df = pd.DataFrame({
        "Kriteria": criteria,
        "Tipe": [criteria_types[c] for c in criteria],
        "Nilai Ideal": [ideal_profile_dict[c] for c in criteria]
    })
    st.dataframe(ideal_df, use_container_width=True)

    
    st.subheader("⚙ Pengaturan Faktor (untuk Profile Matching)")
    core_factors_options = criteria
    default_core_factors = [criteria[-1]] if criteria else []

    selected_core_factors = st.multiselect(
        "Pilih Kriteria Core Factor (Faktor Inti)",
        options=core_factors_options,
        default=default_core_factors,
        help="Kriteria yang dianggap paling penting. Sisanya akan menjadi Secondary Factor.",
        key="pm_core_factors"
    )

    if not selected_core_factors:
        st.warning("Setidaknya satu Core Factor harus dipilih untuk Profile Matching.")
        st.stop()

    cf_weight = st.number_input(f"Bobot Core Factor (0-1)", min_value=0.0, max_value=1.0, value=0.6, step=0.05)
    sf_weight = 1 - cf_weight

    st.write(f"📊 Core Factor Weight: {cf_weight:.2f}")
    st.write(f"📊 Secondary Factor Weight: {sf_weight:.2f}")

# Tombol jalankan perhitungan
run_calc = st.button("▶ Jalankan Perhitungan")

if run_calc:
    if method == "AHP":
        if len(alternative_weights_per_criterion) != len(criteria):
            st.error("Perbandingan alternatif belum lengkap untuk semua kriteria. Lengkapi terlebih dahulu.")
        elif 'weights_ahp_criteria' not in locals():
            st.error("Bobot kriteria AHP belum terhitung dengan benar.")
        else:
            # Calculate final AHP scores
            final_scores_ahp = pd.Series(0.0, index=alternatives)
            for c in criteria:
                w_crit = weights_ahp_criteria.get(c, 0)
                w_alts = alternative_weights_per_criterion.get(c, pd.Series(0, index=alternatives))
                final_scores_ahp += w_crit * w_alts

            st.subheader("📈 Hasil Perhitungan AHP")
            result_df = final_scores_ahp.sort_values(ascending=False).to_frame("Skor Akhir")
            result_df['Ranking'] = range(1, len(result_df) + 1)
            st.dataframe(result_df, use_container_width=True)

            # --- PERBAIKAN GRAFIK AHP ---
            st.subheader("🏆 Hasil AHP - Ranking Alternatif")
            # Ubah data Series ke DataFrame untuk Altair
            chart_data = final_scores_ahp.sort_values(ascending=False).reset_index()
            chart_data.columns = ['Alternatif', 'Skor']

            # Buat grafik dengan Altair
            chart = alt.Chart(chart_data).mark_bar().encode(
                x=alt.X('Alternatif:N', sort=None, axis=alt.Axis(labelAngle=0), title="Alternatif"),
                y=alt.Y('Skor:Q', title="Skor Akhir"),
                tooltip=['Alternatif', alt.Tooltip('Skor', format='.3f')]
            ).properties(
                title='Ranking Alternatif Berdasarkan Skor AHP'
            )
            # Tampilkan grafik dengan st.altair_chart
            st.altair_chart(chart, use_container_width=True)
            # --- AKHIR PERBAIKAN ---

            st.write("🏆 Alternatif terbaik berdasarkan AHP:")
            st.success(f"{final_scores_ahp.idxmax()} dengan skor {final_scores_ahp.max():.3f}")

    elif method == "TOPSIS":
        if df.isnull().values.any():
            st.error("Isi semua nilai alternatif terlebih dahulu.")
        else:
            data = df.values.astype(float)
            w = weights

            # Apply Standard Scaler if selected
            if use_standard_scaler:
                scaler = StandardScaler()
                scaled_data = scaler.fit_transform(data)
                st.write("📊 Data setelah Standard Scaling:")
                st.dataframe(pd.DataFrame(scaled_data, index=alternatives, columns=criteria), use_container_width=True)
                data = scaled_data
            
            # Normalisasi
            norm_data = data / np.sqrt((data ** 2).sum(axis=0))
            weighted_data = norm_data * w

            # Tentukan ideal positif dan negatif berdasarkan tipe kriteria
            ideal_pos = np.where(types == 1, weighted_data.max(axis=0), weighted_data.min(axis=0))
            ideal_neg = np.where(types == 1, weighted_data.min(axis=0), weighted_data.max(axis=0))

            # Jarak ke ideal positif dan negatif
            dist_pos = np.sqrt(((weighted_data - ideal_pos) ** 2).sum(axis=1))
            dist_neg = np.sqrt(((weighted_data - ideal_neg) ** 2).sum(axis=1))

            # Skor preferensi
            scores_topsis = dist_neg / (dist_pos + dist_neg)
            topsis_result = pd.Series(scores_topsis, index=alternatives).sort_values(ascending=False)

            st.subheader("📈 Hasil Perhitungan TOPSIS")
            result_df = topsis_result.to_frame("Skor")
            result_df['Ranking'] = range(1, len(result_df) + 1)
            st.dataframe(result_df, use_container_width=True)

            # --- PERBAIKAN GRAFIK TOPSIS ---
            st.subheader("🏆 Hasil TOPSIS - Ranking Alternatif")
            # Ubah data Series ke DataFrame untuk Altair
            chart_data = topsis_result.sort_values(ascending=False).reset_index()
            chart_data.columns = ['Alternatif', 'Skor']

            # Buat grafik dengan Altair
            chart = alt.Chart(chart_data).mark_bar().encode(
                x=alt.X('Alternatif:N', sort=None, axis=alt.Axis(labelAngle=0), title="Alternatif"),
                y=alt.Y('Skor:Q', title="Skor Preferensi"),
                tooltip=['Alternatif', alt.Tooltip('Skor', format='.3f')]
            ).properties(
                title='Ranking Alternatif Berdasarkan Skor TOPSIS'
            )
            # Tampilkan grafik dengan st.altair_chart
            st.altair_chart(chart, use_container_width=True)
            # --- AKHIR PERBAIKAN ---

            st.write("🏆 Alternatif terbaik berdasarkan TOPSIS:")
            st.success(f"{topsis_result.idxmax()} dengan skor {topsis_result.max():.3f}")

    elif method == "Profile Matching":
        if df.isnull().values.any():
            st.error("Isi semua nilai alternatif terlebih dahulu.")
        else:
            # Pastikan data dalam format yang benar
            df_working = df.copy()
            
            if use_standard_scaler_pm:
                scaler = StandardScaler()
                scaled_data = scaler.fit_transform(df.values.astype(float))
                df_scaled = pd.DataFrame(scaled_data, index=alternatives, columns=criteria)
                
                # Scale to 1-5 range after standard scaling
                min_val = df_scaled.min().min()
                max_val = df_scaled.max().max()
                df_scaled = df_scaled.apply(lambda x: 1 + 4 * (x - min_val) / (max_val - min_val)).round(0).astype(int)
                
                # Scale ideal profile juga
                ideal_values = ideal_profile.values.reshape(1,-1)
                scaled_ideal = scaler.transform(ideal_values)
                scaled_ideal_df = pd.DataFrame(scaled_ideal, columns=criteria)
                
                # Convert scaled ideal to 1-5 range
                scaled_ideal_profile = scaled_ideal_df.apply(lambda x: 1 + 4 * (x - min_val) / (max_val - min_val)).round(0).astype(int)
                ideal_profile_working = pd.Series(scaled_ideal_profile.iloc[0], index=criteria)
                
                st.write("📊 Data setelah Standard Scaling dan konversi ke skala 1-5:")
                st.dataframe(df_scaled, use_container_width=True)
                df_working = df_scaled
            else:
                # Jika tidak menggunakan standard scaler, pastikan data dalam skala 1-5
                df_working = df.copy()
                ideal_profile_working = ideal_profile.copy()

            st.write("📏 Data yang digunakan untuk Profile Matching:")
            st.dataframe(df_working, use_container_width=True)
            
            st.write("🎯 Ideal Profile yang digunakan:")
            st.write(ideal_profile_working)

            # Gap Analysis: Nilai Alternatif - Nilai Ideal
            df_gap = df_working.subtract(ideal_profile_working, axis=1)
            st.write("📊 Gap Analysis (Nilai Alternatif - Nilai Ideal):")
            st.dataframe(df_gap, use_container_width=True)

            # Mapping gap ke bobot
            gap_weights = {
                0: 5,     # Perfect match
                1: 4.5, -1: 4.5,    # Gap ±1
                2: 4, -2: 4,        # Gap ±2
                3: 3.5, -3: 3.5,    # Gap ±3
                4: 3, -4: 3,        # Gap ±4
                5: 2.5, -5: 2.5     # Gap ±5
            }

            # Konversi gap ke weighted gap
            df_wgap = df_gap.copy()
            for col in df_gap.columns:
                df_wgap[col] = df_gap[col].map(lambda x: gap_weights.get(int(x), 1))  # Default 1 jika gap > 5
            
            st.write("⚖ Weighted Gap (Bobot berdasarkan Gap):")
            st.dataframe(df_wgap, use_container_width=True)

            # Pisahkan Core Factor dan Secondary Factor
            cf_cols = [c for c in criteria if c in selected_core_factors]
            sf_cols = [c for c in criteria if c not in selected_core_factors]
            
            st.write(f"🔴 Core Factors: {cf_cols}")
            st.write(f"🔵 Secondary Factors: {sf_cols}")

            # Hitung NCF (Nilai Core Factor) - rata-rata weighted gap untuk core factors
            if len(cf_cols) > 0:
                ncf = df_wgap[cf_cols].mean(axis=1)
            else:
                ncf = pd.Series(0, index=df_working.index)
            
            # Hitung NSF (Nilai Secondary Factor) - rata-rata weighted gap untuk secondary factors  
            if len(sf_cols) > 0:
                nsf = df_wgap[sf_cols].mean(axis=1)
            else:
                nsf = pd.Series(0, index=df_working.index)

            st.write("📈 NCF (Core Factor Score):")
            st.write(ncf.round(3))
            
            st.write("📈 NSF (Secondary Factor Score):")
            st.write(nsf.round(3))

            # Hitung skor akhir
            final_scores_pm = cf_weight * ncf + sf_weight * nsf

            st.subheader("📈 Hasil Perhitungan Profile Matching")
            result_df = final_scores_pm.sort_values(ascending=False).to_frame("Skor")
            result_df['Ranking'] = range(1, len(result_df) + 1)
            st.dataframe(result_df, use_container_width=True)

            # Grafik hasil
            st.subheader("🏆 Hasil Profile Matching - Ranking Alternatif")
            chart_data = final_scores_pm.sort_values(ascending=False).reset_index()
            chart_data.columns = ['Alternatif', 'Skor']

            chart = alt.Chart(chart_data).mark_bar().encode(
                x=alt.X('Alternatif:N', sort=None, axis=alt.Axis(labelAngle=0), title="Alternatif"),
                y=alt.Y('Skor:Q', title="Skor Akhir"),
                tooltip=['Alternatif', alt.Tooltip('Skor', format='.3f')]
            ).properties(
                title='Ranking Alternatif Berdasarkan Skor Profile Matching'
            )
            st.altair_chart(chart, use_container_width=True)

            st.write("🏆 Alternatif terbaik berdasarkan Profile Matching:")
            st.success(f"{final_scores_pm.idxmax()} dengan skor {final_scores_pm.max():.3f}")

            # Tampilkan breakdown
            st.subheader("📊 Breakdown Perhitungan")
            breakdown_df = pd.DataFrame({
                'NCF (Core Factor)': ncf.round(3),
                'NSF (Secondary Factor)': nsf.round(3),
                'Skor Akhir': final_scores_pm.round(3)
            })
            st.dataframe(breakdown_df, use_container_width=True)