app.py

"""
Hostel Management System — Streamlit Web App
PDC Lab Project | UCP BSAI
Ch Hamza Younas (L1F23BAI0089) & Muhammad Abdullah (L1F23BSAI0063)
"""

import json
import time
from datetime import date

import pandas as pd
import plotly.express as px
import plotly.graph_objects as go
import streamlit as st

from hostel_data import (
    STATUS_MAP,
    add_announcement,
    add_gate_log,
    add_student,
    assign_room,
    bulk_mark_attendance,
    export_summary,
    find_room,
    find_student,
    fresh_state,
    get_activity_feed,
    get_analytics,
    get_student_attendance_history,
    get_student_gate_logs,
    mark_attendance,
    match_student,
    pay_label,
    record_payment,
    room_status,
)
from pdc_benchmark import CHART_CATEGORIES, run_all_benchmarks
from theme import (
    activity_feed,
    feature_grid,
    hero,
    inject_theme,
    metrics_row,
    page_footer,
    room_grid,
    sidebar_brand,
)

st.set_page_config(
    page_title="Hostel MS | PDC Lab",
    page_icon="🏠",
    layout="wide",
    initial_sidebar_state="expanded",
)
inject_theme()


def init_session():
    defaults = {
        "db": fresh_state(),
        "user": None,
        "role": None,
        "student_idx": -1,
    }
    for key, val in defaults.items():
        if key not in st.session_state:
            st.session_state[key] = val


def logout():
    st.session_state.user = None
    st.session_state.role = None
    st.session_state.student_idx = -1


def active_students(db):
    return [s for s in db["students"] if s["active"]]


def active_rooms(db):
    return [r for r in db["rooms"] if r["active"]]


def student_name(db, idx):
    return db["students"][idx]["name"]


def room_number(db, room_id):
    for r in db["rooms"]:
        if r["id"] == room_id:
            return r["number"]
    return "None"


# ── LOGIN ─────────────────────────────────────────────────────────────────────

def page_login():
    hero("🏠 Hostel Management System", "Smart hostel operations · PDC parallel computing demo")
    feature_grid([
        ("📊", "Live Dashboard", "Occupancy, fees, complaints & analytics at a glance"),
        ("🔐", "Role Portals", "Separate admin & student workspaces with secure login"),
        ("⚡", "PDC Benchmarks", "Real OpenMP & POSIX Threads speedup tests in C"),
        ("🍽️", "Full Operations", "Rooms, mess, gate logs, attendance & announcements"),
    ])
    st.markdown("<br>", unsafe_allow_html=True)

    c1, c2, c3 = st.columns([1, 2, 1])
    with c2:
        st.markdown('<div class="login-shell">', unsafe_allow_html=True)
        st.markdown(
            """
<div class="login-header">
    <div class="icon">🏠</div>
    <h2>Welcome Back</h2>
    <p>Sign in to your hostel portal</p>
</div>
""",
            unsafe_allow_html=True,
        )
        tab_a, tab_s = st.tabs(["🔐 Admin / Warden", "🎓 Student"])

        with tab_a:
            user = st.text_input("Username", value="admin", key="adm_user")
            pwd = st.text_input("Password", type="password", value="admin123", key="adm_pwd")
            if st.button("Login as Admin", type="primary", use_container_width=True):
                if user == "admin" and pwd == "admin123":
                    st.session_state.user = "Warden"
                    st.session_state.role = "admin"
                    st.success("Welcome, Warden!")
                    time.sleep(0.3)
                    st.rerun()
                else:
                    st.error("Invalid admin credentials")

        with tab_s:
            roll = st.text_input("Roll No", value="UCP-BSAI-1001", key="stu_roll")
            pwd2 = st.text_input("Password", type="password", value="student123", key="stu_pwd")
            if st.button("Login as Student", type="primary", use_container_width=True):
                idx = find_student(st.session_state.db["students"], roll)
                if idx >= 0 and st.session_state.db["students"][idx]["password"] == pwd2:
                    st.session_state.user = st.session_state.db["students"][idx]["name"]
                    st.session_state.role = "student"
                    st.session_state.student_idx = idx
                    st.success(f"Welcome, {st.session_state.user}!")
                    time.sleep(0.3)
                    st.rerun()
                else:
                    st.error("Invalid roll number or password")

        st.caption("Demo · admin/admin123 · UCP-BSAI-1001/student123")
        st.markdown("</div>", unsafe_allow_html=True)

    page_footer()


# ── ADMIN ─────────────────────────────────────────────────────────────────────

def admin_dashboard():
    db = st.session_state.db
    stats = get_analytics(db)
    hero("Admin Control Center", f"Welcome back, {st.session_state.user}", badge="Live")

    metrics_row([
        (stats["students_total"], "Active Students", f"{stats['present_today']} present today"),
        (f"{stats['occupancy_pct']}%", "Occupancy", f"{stats['vacant']} vacant rooms"),
        (stats["defaulters"], "Fee Defaulters", f"PKR {stats['total_dues']:,.0f} pending"),
        (len(db["complaints"]), "Open Tickets", "Track in Mess & Complaints"),
    ])

    c1, c2, c3 = st.columns(3)
    with c1:
        fig = px.pie(
            names=["Vacant", "Partial", "Full"],
            values=[stats["vacant"], stats["partial"], stats["full"]],
            title="Room Availability",
            color_discrete_sequence=["#10B981", "#F59E0B", "#6366F1"],
            hole=0.45,
        )
        fig.update_layout(template="plotly_dark", height=320, margin=dict(t=40, b=20))
        st.plotly_chart(fig, use_container_width=True)

    with c2:
        fig = go.Figure(go.Bar(
            x=["Rent Clear", "Mess Clear", "Defaulters"],
            y=[stats["rent_clear"], stats["mess_clear"], stats["defaulters"]],
            marker_color=["#6366F1", "#A855F7", "#EF4444"],
        ))
        fig.update_layout(template="plotly_dark", title="Fee Status", height=320, margin=dict(t=40, b=20))
        st.plotly_chart(fig, use_container_width=True)

    with c3:
        cc = stats["complaint_counts"]
        fig = px.bar(
            x=list(cc.keys()), y=list(cc.values()),
            title="Complaint Pipeline", color=list(cc.values()),
            color_continuous_scale="Viridis",
        )
        fig.update_layout(template="plotly_dark", height=320, showlegend=False, margin=dict(t=40, b=20))
        st.plotly_chart(fig, use_container_width=True)

    st.markdown("#### 📢 Latest Announcements")
    for a in db["announcements"][:3]:
        pri = a["priority"].upper()
        st.info(f"**{a['title']}** ({pri}) — {a['body']}")

    c1, c2 = st.columns([1, 1])
    with c1:
        st.markdown('<p class="panel-title">🕐 Live Activity Feed</p>', unsafe_allow_html=True)
        feed = get_activity_feed(db)
        if feed:
            activity_feed(feed)
        else:
            st.caption("No recent activity")

    with c2:
        st.markdown('<p class="panel-title">🛏️ Room Occupancy Grid</p>', unsafe_allow_html=True)
        tiles = [{
            "number": r["number"], "occupied": r["occupied"],
            "capacity": r["capacity"], "status": room_status(r),
        } for r in active_rooms(db)[:10]]
        room_grid(tiles)

    page_footer()


def admin_rooms():
    hero("Room Management", "Inventory, capacity & rent configuration")
    db = st.session_state.db
    tab1, tab2, tab3 = st.tabs(["📋 All Rooms", "➕ Add Room", "🗑️ Delete"])

    with tab1:
        rows = [{
            "Room": r["number"], "Floor": r["floor"], "Type": r["type"],
            "AC": "Yes" if r["ac"] else "No", "Occ/Cap": f"{r['occupied']}/{r['capacity']}",
            "Status": room_status(r), "Rent (PKR)": r["rent"],
        } for r in active_rooms(db)]
        st.dataframe(pd.DataFrame(rows), use_container_width=True, hide_index=True)
        st.download_button("⬇️ Export CSV", pd.DataFrame(rows).to_csv(index=False),
                           "rooms.csv", "text/csv", use_container_width=True)

    with tab2:
        with st.form("add_room"):
            num = st.text_input("Room Number", placeholder="R-116")
            floor = st.number_input("Floor", 1, 10, 1)
            rtype = st.selectbox("Type", ["2-seater", "4-seater"])
            ac = st.checkbox("AC Room")
            cap = st.number_input("Capacity", 1, 8, 2)
            rent = st.number_input("Monthly Rent (PKR)", 5000, 50000, 12000)
            if st.form_submit_button("Add Room", type="primary"):
                if find_room(db["rooms"], num) >= 0:
                    st.error(f"Room {num} already exists")
                else:
                    db["rooms"].append({
                        "id": len(db["rooms"]) + 1, "number": num, "floor": floor,
                        "type": rtype, "ac": ac, "capacity": cap, "occupied": 0,
                        "rent": rent, "active": True,
                    })
                    st.success(f"Room {num} added")
                    st.rerun()

    with tab3:
        num = st.text_input("Room to delete")
        if st.button("Delete Room", type="primary"):
            ri = find_room(db["rooms"], num)
            if ri < 0:
                st.error("Room not found")
            elif any(s["active"] and s["room_id"] == db["rooms"][ri]["id"] for s in db["students"]):
                st.error("Cannot delete — students assigned")
            else:
                db["rooms"][ri]["active"] = False
                st.success(f"Room {num} removed")
                st.rerun()


def admin_students():
    hero("Student Management", "Enrollment, search, room assignment")
    db = st.session_state.db
    tab1, tab2, tab3, tab4 = st.tabs(["📋 Roster", "➕ Enroll", "🔍 Search", "🏠 Assign Room"])

    with tab1:
        rows = []
        for s in active_students(db):
            status = "CLEAR" if s["rent_paid"] and s["mess_paid"] else "DUE"
            rows.append({
                "Name": s["name"], "Roll": s["roll"], "Room": room_number(db, s["room_id"]),
                "Phone": s["phone"], "Rent": pay_label(s["rent_paid"]),
                "Mess": pay_label(s["mess_paid"]), "Status": status,
            })
        st.dataframe(pd.DataFrame(rows), use_container_width=True, hide_index=True)
        st.download_button("⬇️ Export CSV", pd.DataFrame(rows).to_csv(index=False),
                           "students.csv", "text/csv")

    with tab2:
        with st.form("enroll"):
            name = st.text_input("Full Name")
            roll = st.text_input("Roll Number", placeholder="UCP-BSAI-1011")
            phone = st.text_input("Phone", placeholder="0300-1234567")
            room = st.text_input("Room Number", placeholder="R-116")
            if st.form_submit_button("Enroll Student", type="primary"):
                ok, msg = add_student(db, name, roll, phone, room)
                st.success(msg) if ok else st.error(msg)
                if ok:
                    st.rerun()

    with tab3:
        key = st.text_input("Search by name or roll")
        if key:
            t0 = time.perf_counter()
            results = [s for s in db["students"] if match_student(s, key)]
            elapsed = time.perf_counter() - t0
            st.dataframe(pd.DataFrame([{
                "Name": s["name"], "Roll": s["roll"], "Room": room_number(db, s["room_id"]),
                "Rent": pay_label(s["rent_paid"]), "Mess": pay_label(s["mess_paid"]),
            } for s in results]), use_container_width=True, hide_index=True)
            st.caption(f"Found {len(results)} in {elapsed:.6f}s")

    with tab4:
        roll = st.text_input("Student Roll", key="assign_roll")
        room = st.text_input("Target Room", key="assign_room")
        if st.button("Assign Room", type="primary"):
            ok, msg = assign_room(db, roll, room)
            st.success(msg) if ok else st.error(msg)
            if ok:
                st.rerun()


def admin_fees():
    hero("Fee & Finance", "Challans, payments & defaulter tracking")
    db = st.session_state.db
    tab1, tab2, tab3, tab4 = st.tabs(["📄 Challans", "💳 Record Payment", "⚠️ Defaulters", "📜 History"])

    with tab1:
        rows, total = [], 0
        for s in active_students(db):
            t = s["rent_due"] + s["mess_due"] + s["utility_due"]
            total += t
            rows.append({"Name": s["name"], "Rent": s["rent_due"], "Mess": s["mess_due"],
                         "Utility": s["utility_due"], "Total": t})
        st.dataframe(pd.DataFrame(rows), use_container_width=True, hide_index=True)
        st.metric("Grand Total Monthly Dues", f"PKR {total:,.0f}")

    with tab2:
        roll = st.text_input("Student Roll No")
        idx = find_student(db["students"], roll) if roll else -1
        if idx >= 0:
            s = db["students"][idx]
            st.info(f"**{s['name']}** · Rent: {pay_label(s['rent_paid'])} · Mess: {pay_label(s['mess_paid'])}")
            if s["rent_paid"] and s["mess_paid"]:
                st.success("All payments clear")
            else:
                opts = []
                if not s["rent_paid"]:
                    opts.append("Rent")
                if not s["mess_paid"]:
                    opts.append("Mess")
                choice = st.multiselect("Record payment for", opts)
                if st.button("Save Payment", type="primary"):
                    record_payment(db, idx, "Rent" in choice, "Mess" in choice)
                    st.success("Payment recorded")
                    st.rerun()

    with tab3:
        rows = [{"Name": s["name"], "Roll": s["roll"],
                 "Rent": pay_label(s["rent_paid"]), "Mess": pay_label(s["mess_paid"])}
                for s in active_students(db) if not s["rent_paid"] or not s["mess_paid"]]
        st.dataframe(pd.DataFrame(rows) if rows else pd.DataFrame([{"Status": "No defaulters"}]),
                     use_container_width=True, hide_index=True)

    with tab4:
        hist = []
        for p in db["payment_history"]:
            hist.append({
                "Student": student_name(db, p["student_idx"]),
                "Type": p["type"], "Amount": p["amount"], "Date": p["date"],
            })
        st.dataframe(pd.DataFrame(hist), use_container_width=True, hide_index=True)


def admin_mess_complaints():
    hero("Mess & Complaints", "Weekly menu & maintenance tickets")
    db = st.session_state.db
    tab1, tab2, tab3 = st.tabs(["🍽️ Mess Menu", "📋 Complaints", "📢 Announcements"])

    with tab1:
        cols = st.columns(2)
        for i, m in enumerate(db["mess"]):
            with cols[i % 2]:
                with st.expander(f"📅 {m['day']}", expanded=i < 2):
                    st.markdown(f"🌅 **Breakfast:** {m['breakfast']}")
                    st.markdown(f"☀️ **Lunch:** {m['lunch']}")
                    st.markdown(f"🌙 **Dinner:** {m['dinner']}")

    with tab2:
        filter_st = st.selectbox("Filter by status", ["All"] + list(STATUS_MAP.values()))
        for c in db["complaints"]:
            if filter_st != "All" and STATUS_MAP[c["status"]] != filter_st:
                continue
            name = student_name(db, c["student_idx"])
            st.markdown(f"**#{c['id']}** · {name} · `{STATUS_MAP[c['status']]}` · _{c.get('created', '')}_")
            st.write(c["text"])
            new_st = st.selectbox("Status", [0, 1, 2], format_func=lambda x: STATUS_MAP[x],
                                  key=f"st_{c['id']}")
            if st.button("Update", key=f"btn_{c['id']}"):
                c["status"] = new_st
                st.success("Updated")
                st.rerun()

    with tab3:
        with st.form("ann"):
            title = st.text_input("Title")
            body = st.text_area("Message")
            pri = st.selectbox("Priority", ["low", "medium", "high"])
            if st.form_submit_button("Publish", type="primary") and title and body:
                add_announcement(db, title, body, pri)
                st.success("Announcement published")
                st.rerun()
        for a in db["announcements"]:
            st.info(f"**{a['title']}** ({a['priority']}) — {a['date']}\n\n{a['body']}")


def admin_gate_attendance():
    hero("Gate & Attendance", "Entry/exit logs & daily roll call")
    db = st.session_state.db
    tab1, tab2 = st.tabs(["🚪 Gate Logs", "✅ Attendance"])

    with tab1:
        c1, c2 = st.columns(2)
        with c1:
            rolls = {s["roll"]: i for s in active_students(db)}
            roll = st.selectbox("Student", list(rolls.keys()))
            log_type = st.selectbox("Action", ["IN", "OUT"])
            if st.button("Log Entry", type="primary"):
                add_gate_log(db, rolls[roll], log_type)
                st.success(f"{log_type} logged for {student_name(db, rolls[roll])}")
                st.rerun()
        with c2:
            logs = [{
                "Student": student_name(db, g["student_idx"]),
                "Type": g["type"], "Time": g["time"],
            } for g in reversed(db["gate_logs"][-15:])]
            st.dataframe(pd.DataFrame(logs), use_container_width=True, hide_index=True)

    with tab2:
        today = str(date.today())
        bc1, bc2, bc3 = st.columns(3)
        if bc1.button("✅ Mark All Present", use_container_width=True):
            bulk_mark_attendance(db, True)
            st.success("All students marked present")
            st.rerun()
        if bc2.button("❌ Mark All Absent", use_container_width=True):
            bulk_mark_attendance(db, False)
            st.warning("All students marked absent")
            st.rerun()
        if bc3.button("📊 Attendance Summary", use_container_width=True):
            present = sum(1 for a in db["attendance"]
                          if a["date"] == today and a["present"])
            st.info(f"Present today: **{present}** / {len(active_students(db))}")

        st.divider()
        for i, s in enumerate(active_students(db)):
            rec = next((a for a in db["attendance"]
                        if a["student_idx"] == i and a["date"] == today), None)
            present = rec["present"] if rec else False
            c1, c2, c3 = st.columns([3, 1, 1])
            c1.write(f"**{s['name']}** ({s['roll']})")
            if c2.button("Present", key=f"p_{i}"):
                mark_attendance(db, i, True)
                st.rerun()
            if c3.button("Absent", key=f"a_{i}"):
                mark_attendance(db, i, False)
                st.rerun()
            st.caption("Present" if present else "Absent")


def admin_analytics():
    hero("Analytics Hub", "Deep insights across hostel operations")
    db = st.session_state.db
    stats = get_analytics(db)

    c1, c2 = st.columns(2)
    with c1:
        students = active_students(db)
        df = pd.DataFrame({
            "Category": ["Paid", "Due"],
            "Count": [
                sum(1 for s in students if s["rent_paid"]),
                sum(1 for s in students if not s["rent_paid"]),
            ],
        })
        fig = px.pie(df, names="Category", values="Count", title="Rent Collection",
                     color="Category", color_discrete_map={"Paid": "#6366F1", "Due": "#EF4444"}, hole=0.4)
        fig.update_layout(template="plotly_dark", height=350)
        st.plotly_chart(fig, use_container_width=True)

    with c2:
        floors = {}
        for r in active_rooms(db):
            floors[r["floor"]] = floors.get(r["floor"], 0) + r["occupied"]
        fig = px.bar(x=list(floors.keys()), y=list(floors.values()), title="Occupancy by Floor",
                     labels={"x": "Floor", "y": "Students"}, color_discrete_sequence=["#A855F7"])
        fig.update_layout(template="plotly_dark", height=350)
        st.plotly_chart(fig, use_container_width=True)

    st.markdown("#### Summary")
    st.json({
        "occupancy_rate": f"{stats['occupancy_pct']}%",
        "defaulters": stats["defaulters"],
        "pending_dues_pkr": stats["total_dues"],
        "complaints": stats["complaint_counts"],
        "gate_logs_today": len(db["gate_logs"]),
    })
    page_footer()


def admin_reports():
    hero("Reports & Export", "Download operational snapshots", badge="Export")
    db = st.session_state.db
    summary = export_summary(db)

    c1, c2 = st.columns(2)
    with c1:
        st.markdown("#### 📦 Summary Report")
        st.json(summary)
        st.download_button(
            "⬇️ Download JSON Report",
            json.dumps(summary, indent=2),
            "hostel_report.json",
            "application/json",
            use_container_width=True,
        )
    with c2:
        students = active_students(db)
        df = pd.DataFrame([{
            "Name": s["name"], "Roll": s["roll"],
            "Room": room_number(db, s["room_id"]),
            "Rent": pay_label(s["rent_paid"]), "Mess": pay_label(s["mess_paid"]),
        } for s in students])
        st.download_button(
            "⬇️ Download Student Roster CSV",
            df.to_csv(index=False),
            "roster.csv",
            "text/csv",
            use_container_width=True,
        )
        rooms_df = pd.DataFrame([{
            "Room": r["number"], "Floor": r["floor"], "Status": room_status(r),
            "Occupied": r["occupied"], "Capacity": r["capacity"],
        } for r in active_rooms(db)])
        st.download_button(
            "⬇️ Download Room Inventory CSV",
            rooms_df.to_csv(index=False),
            "rooms.csv",
            "text/csv",
            use_container_width=True,
        )

    if st.button("🔄 Reset Demo Data", type="secondary"):
        st.session_state.db = fresh_state()
        st.success("Demo data restored")
        st.rerun()
    page_footer()


def page_help():
    hero("Help & About", "Project documentation & credentials")
    st.markdown("""
    ### About
    **Hostel Management System** — PDC Lab Project for UCP BSAI.  
    Built by **Ch Hamza Younas** & **Muhammad Abdullah** under **Ma'am Khadija**.

    ### Demo Logins
    | Role | Username / Roll | Password |
    |------|-----------------|----------|
    | Admin | `admin` | `admin123` |
    | Student | `UCP-BSAI-1001` | `student123` |

    ### PDC Benchmark
    Runs compiled **search_bench** with **Sequential**, **OpenMP**, and **POSIX Threads** in C.

    ### Links
    - [Hugging Face Space](https://huggingface.co/spaces/Hamzavelous/Hostel-Management_System)
    - [GitHub Repository](https://github.com/Hamzavelous/Hostel-Management_System)
    """)
    page_footer()


def page_pdc():
    hero("⚡ PDC Performance Test", "Sequential · OpenMP · POSIX Threads", badge="C Backend")
    st.markdown(
        "Runs the compiled **search_bench** binary with real OpenMP and pthread parallelism — "
        "same engine as the console C application."
    )
    keyword = st.text_input("Search keyword", value="Ali")

    if st.button("Run Benchmark", type="primary", use_container_width=True):
        try:
            with st.spinner("Executing C parallel benchmarks..."):
                rows, kw = run_all_benchmarks(None, keyword)
        except FileNotFoundError as exc:
            st.error(str(exc))
            return
        except RuntimeError as exc:
            st.error(f"Benchmark failed: {exc}")
            return

        df = pd.DataFrame(rows)
        df["Time (ms)"] = (df["Time (s)"] * 1000).round(2)
        st.dataframe(
            df[["Method", "Workers", "Fee (s)", "Search (s)", "Time (s)", "Time (ms)", "Found", "Speedup"]],
            use_container_width=True, hide_index=True,
        )

        chart_df = df.set_index("Label").reindex(CHART_CATEGORIES).reset_index()
        fig = px.bar(chart_df, x="Label", y="Speedup", color="Method", text="Speedup",
                     title="Speedup vs Sequential Baseline",
                     color_discrete_map={
                         "Sequential": "#6366F1", "OpenMP": "#A855F7", "POSIX Threads": "#10B981",
                     })
        fig.update_traces(texttemplate="%{text:.2f}x", textposition="outside")
        fig.update_layout(template="plotly_dark", height=420, xaxis_title="")
        st.plotly_chart(fig, use_container_width=True)

        c1, c2 = st.columns(2)
        with c1:
            fig2 = px.line(chart_df, x="Label", y="Time (ms)", markers=True, title="Execution Time (ms)")
            fig2.update_layout(template="plotly_dark", height=300)
            st.plotly_chart(fig2, use_container_width=True)
        with c2:
            st.info(
                f"**Workload:** Fee calculation + student search\n\n"
                f"**Keyword:** \"{kw}\" matched **{rows[0]['Found']}** student(s)\n\n"
                f"**Best speedup:** {max(r['Speedup'] for r in rows):.2f}x"
            )


# ── STUDENT ───────────────────────────────────────────────────────────────────

def student_profile():
    s = st.session_state.db["students"][st.session_state.student_idx]
    db = st.session_state.db
    hero("My Profile", s["name"])
    c1, c2 = st.columns(2)
    with c1:
        st.markdown("#### Personal")
        st.write(f"**Roll:** {s['roll']}")
        st.write(f"**Phone:** {s['phone']}")
        st.write(f"**Emergency:** {s['emergency']}")
        st.write(f"**Last Payment:** {s['last_pay_date']}")
    with c2:
        st.markdown("#### Room")
        if s["room_id"] > 0:
            r = next(x for x in db["rooms"] if x["id"] == s["room_id"])
            st.write(f"**Room:** {r['number']} · Floor {r['floor']}")
            st.write(f"**Type:** {r['type']} · AC: {'Yes' if r['ac'] else 'No'}")
            st.write(f"**Monthly Rent:** PKR {r['rent']:,.0f}")
        else:
            st.warning("No room assigned")


def student_fees_page():
    s = st.session_state.db["students"][st.session_state.student_idx]
    total = s["rent_due"] + s["mess_due"] + s["utility_due"]
    hero("My Fees", "Payment status")
    metrics_row([
        (f"PKR {s['rent_due']:,.0f}", "Rent", pay_label(s["rent_paid"])),
        (f"PKR {s['mess_due']:,.0f}", "Mess", pay_label(s["mess_paid"])),
        (f"PKR {s['utility_due']:,.0f}", "Utility", "Fixed"),
        (f"PKR {total:,.0f}", "Total Due", "Monthly"),
    ])
    if s["rent_paid"] and s["mess_paid"]:
        st.success("✅ All payments clear — thank you!")
    else:
        st.warning("⚠️ Pending dues — please visit the warden office")


def student_complaint_page():
    idx = st.session_state.student_idx
    db = st.session_state.db
    hero("Complaint Box", "Report maintenance issues")
    text = st.text_area("Describe your issue", placeholder="Wi-Fi, plumbing, electricity...")
    if st.button("Submit Ticket", type="primary") and text.strip():
        cid = len(db["complaints"]) + 1
        db["complaints"].append({
            "id": cid, "student_idx": idx, "text": text.strip(),
            "status": 0, "created": str(date.today()),
        })
        st.success(f"Ticket #{cid} submitted")
        st.rerun()
    st.markdown("#### My Tickets")
    for c in db["complaints"]:
        if c["student_idx"] == idx:
            st.info(f"#{c['id']}: {c['text']} — **{STATUS_MAP[c['status']]}**")


def student_mess_page():
    hero("Mess Menu", "Weekly dining schedule")
    for m in st.session_state.db["mess"]:
        with st.expander(f"📅 {m['day']}"):
            st.write(f"🌅 **Breakfast:** {m['breakfast']}")
            st.write(f"☀️ **Lunch:** {m['lunch']}")
            st.write(f"🌙 **Dinner:** {m['dinner']}")


def student_announcements():
    hero("Announcements", "Notices from hostel administration")
    for a in st.session_state.db["announcements"]:
        icon = "🔴" if a["priority"] == "high" else "🟡" if a["priority"] == "medium" else "🟢"
        st.markdown(f"{icon} **{a['title']}** · _{a['date']}_")
        st.write(a["body"])
        st.divider()
    page_footer()


def student_activity():
    idx = st.session_state.student_idx
    db = st.session_state.db
    hero("My Activity", "Gate logs & attendance history")
    tab1, tab2 = st.tabs(["🚪 Gate Logs", "✅ Attendance"])

    with tab1:
        logs = get_student_gate_logs(db, idx)
        if logs:
            st.dataframe(pd.DataFrame([{
                "Action": g["type"], "Time": g["time"],
            } for g in reversed(logs)]), use_container_width=True, hide_index=True)
        else:
            st.info("No gate logs yet")

    with tab2:
        hist = get_student_attendance_history(db, idx)
        if hist:
            st.dataframe(pd.DataFrame([{
                "Date": a["date"],
                "Status": "Present" if a["present"] else "Absent",
            } for a in reversed(hist)]), use_container_width=True, hide_index=True)
        else:
            st.info("No attendance records yet")
    page_footer()


# ── ROUTER ────────────────────────────────────────────────────────────────────

ADMIN_PAGES = {
    "🏠 Dashboard": admin_dashboard,
    "🛏️ Rooms": admin_rooms,
    "🎓 Students": admin_students,
    "💰 Fees": admin_fees,
    "🍽️ Mess & Complaints": admin_mess_complaints,
    "🚪 Gate & Attendance": admin_gate_attendance,
    "📊 Analytics": admin_analytics,
    "📁 Reports": admin_reports,
    "⚡ PDC Performance": page_pdc,
    "❓ Help": page_help,
}

STUDENT_PAGES = {
    "👤 My Profile": student_profile,
    "💰 My Fees": student_fees_page,
    "📝 Complaints": student_complaint_page,
    "🍽️ Mess Menu": student_mess_page,
    "📢 Announcements": student_announcements,
    "🕐 My Activity": student_activity,
    "⚡ PDC Performance": page_pdc,
    "❓ Help": page_help,
}


def main():
    init_session()
    if st.session_state.role is None:
        page_login()
        return

    with st.sidebar:
        sidebar_brand()
        st.markdown(f"### 👤 {st.session_state.user}")
        st.caption(f"Role · **{st.session_state.role.title()}**")
        if st.session_state.role == "student":
            pending = sum(
                1 for a in st.session_state.db["announcements"] if a["priority"] == "high"
            )
            st.caption(f"📢 {pending} high-priority notices")
        elif st.session_state.role == "admin":
            stats = get_analytics(st.session_state.db)
            st.caption(f"⚠️ {stats['defaulters']} fee defaulters · {stats['vacant']} vacant rooms")
        st.divider()

        pages = ADMIN_PAGES if st.session_state.role == "admin" else STUDENT_PAGES
        choice = st.radio("Navigate", list(pages.keys()), label_visibility="collapsed")

        st.divider()
        if st.button("🚪 Logout", use_container_width=True, type="secondary"):
            logout()
            st.rerun()

        st.divider()
        st.caption("PDC Lab · UCP BSAI")
        st.caption("Hamza Younas & Abdullah")
        st.caption("[HF Space](https://huggingface.co/spaces/Hamzavelous/Hostel-Management_System)")

    pages[choice]()


if __name__ == "__main__":
    main()