"""
FocusTrack - Page 4: Settings
Configure tracker behavior, categories, and data management.
"""

import streamlit as st
import json
import shutil
from datetime import datetime
from pathlib import Path

from ui_utils import privacy_badge, page_header, CATEGORY_COLORS, get_db

DB_PATH = Path(__file__).parent.parent / "data" / "activity.db"


def render():
    db = get_db()
    privacy_badge()
    page_header("Settings", "Configure FocusTrack to your workflow")

    settings = db.get_all_settings()

    tab1, tab2, tab3, tab4 = st.tabs(["⚙️ Tracker", "🏷️ Categories", "🗄️ Data & Backup", "🎨 Appearance"])

    # ─── Tab 1: Tracker Settings ──────────────────────────────────────────────
    with tab1:
        st.markdown("#### Tracking Behavior")

        col1, col2 = st.columns(2)
        with col1:
            idle_threshold = st.number_input(
                "Idle threshold (seconds)",
                min_value=30, max_value=3600,
                value=int(settings.get("idle_threshold_seconds", 300)),
                step=30,
                help="User is considered idle after this many seconds without mouse/keyboard activity."
            )

            heartbeat = st.number_input(
                "Heartbeat interval (seconds)",
                min_value=1, max_value=60,
                value=int(settings.get("heartbeat_interval", 5)),
                step=1,
                help="How often activity is logged. Lower = more granular, higher = less CPU."
            )

        with col2:
            ignored_raw = settings.get("ignored_apps", '[]')
            try:
                ignored_list = json.loads(ignored_raw)
            except Exception:
                ignored_list = []

            ignored_text = st.text_area(
                "Ignored apps (one per line)",
                value="\n".join(ignored_list),
                height=120,
                help="Apps listed here will not be tracked."
            )

            auto_start = st.toggle(
                "Auto-start tracker on launch",
                value=settings.get("auto_start", "false") == "true"
            )

        if st.button("💾 Save Tracker Settings", use_container_width=False):
            db.set_setting("idle_threshold_seconds", str(idle_threshold))
            db.set_setting("heartbeat_interval", str(heartbeat))
            db.set_setting("auto_start", "true" if auto_start else "false")
            new_ignored = [a.strip() for a in ignored_text.strip().split("\n") if a.strip()]
            db.set_setting("ignored_apps", json.dumps(new_ignored))
            st.toast("✅ Tracker settings saved!", icon="✅")
            st.rerun()

        st.markdown("---")
        st.markdown("#### Tracker Status")

        status = db.get_setting("tracker_running", "true")
        status_map = {"true": ("🟢 Running", "#10b981"), "paused": ("🟡 Paused", "#f59e0b"), "false": ("🔴 Stopped", "#f43f5e")}
        label, color = status_map.get(status, ("Unknown", "#6366f1"))
        st.markdown(
            f"<span style='color:{color}; font-size:1rem; font-weight:600;'>{label}</span>",
            unsafe_allow_html=True
        )

        col_s1, col_s2, col_s3 = st.columns([1, 1, 1])
        with col_s1:
            if st.button("▶ Start", use_container_width=True):
                db.set_setting("tracker_running", "true")
                st.toast("Tracker started")
                st.rerun()
        with col_s2:
            if st.button("⏸ Pause", use_container_width=True):
                db.set_setting("tracker_running", "paused")
                st.toast("Tracker paused")
                st.rerun()
        with col_s3:
            if st.button("⏹ Stop", use_container_width=True):
                db.set_setting("tracker_running", "false")
                st.toast("Tracker stopped")
                st.rerun()

    # ─── Tab 2: Categories ────────────────────────────────────────────────────
    with tab2:
        st.markdown("#### Category Rules")
        st.markdown("<p style='color:#9090b0; font-size:0.85rem;'>Define which apps and keywords map to which category. The tracker uses these rules to auto-categorize activity.</p>", unsafe_allow_html=True)

        cats = db.get_categories()

        for cat in cats:
            with st.expander(f"{'●'} {cat['name'].title()}", expanded=False):
                col_n, col_c = st.columns([3, 1])
                with col_n:
                    cat_name = st.text_input("Name", value=cat["name"], key=f"cname_{cat['id']}")
                with col_c:
                    cat_color = st.color_picker("Color", value=cat["color"], key=f"ccolor_{cat['id']}")

                try:
                    kw_list = json.loads(cat["keywords"] or "[]")
                    app_list = json.loads(cat["apps"] or "[]")
                except Exception:
                    kw_list, app_list = [], []

                col_k, col_a = st.columns(2)
                with col_k:
                    kw_text = st.text_area(
                        "Keywords (one per line)",
                        value="\n".join(kw_list),
                        height=100,
                        key=f"kw_{cat['id']}",
                        help="These words are matched against app name and window title."
                    )
                with col_a:
                    app_text = st.text_area(
                        "App names (one per line)",
                        value="\n".join(app_list),
                        height=100,
                        key=f"apps_{cat['id']}",
                        help="Partial matches against the process/app name."
                    )

                col_save, col_del = st.columns([1, 1])
                with col_save:
                    if st.button("💾 Save", key=f"save_cat_{cat['id']}", use_container_width=True):
                        new_kw  = [k.strip() for k in kw_text.strip().split("\n") if k.strip()]
                        new_app = [a.strip() for a in app_text.strip().split("\n") if a.strip()]
                        db.upsert_category(cat_name, cat_color, new_kw, new_app)
                        st.toast(f"✅ '{cat_name}' saved")
                        st.rerun()
                with col_del:
                    if cat["name"] not in ("idle", "uncategorized"):
                        if st.button("🗑 Delete", key=f"del_cat_{cat['id']}", use_container_width=True):
                            db.delete_category(cat["name"])
                            st.toast(f"Deleted '{cat['name']}'")
                            st.rerun()

        st.markdown("---")
        st.markdown("#### Add New Category")
        nc1, nc2, nc3 = st.columns([2, 1, 1])
        with nc1:
            new_cat_name = st.text_input("Category name", placeholder="e.g. learning")
        with nc2:
            new_cat_color = st.color_picker("Color", value="#6366f1")
        with nc3:
            st.markdown("<div style='margin-top:28px'></div>", unsafe_allow_html=True)
            if st.button("➕ Add Category", use_container_width=True):
                if new_cat_name.strip():
                    db.upsert_category(new_cat_name.strip(), new_cat_color, [], [])
                    st.toast(f"✅ Added '{new_cat_name}'")
                    st.rerun()

    # ─── Tab 3: Data & Backup ─────────────────────────────────────────────────
    with tab3:
        st.markdown("#### Database Info")

        db_size = db.get_db_size_mb()
        from datetime import date
        from datetime import datetime as dt2
        from ui_utils import get_date_range
        start, end = get_date_range("Last 30 days")
        count = db.get_activity_count(start, end)

        col_i1, col_i2, col_i3 = st.columns(3)
        with col_i1:
            st.metric("Database Size", f"{db_size:.2f} MB")
        with col_i2:
            st.metric("Records (30d)", f"{count:,}")
        with col_i3:
            st.metric("DB Location", "Local only ✅")

        st.code(str(DB_PATH), language=None)

        st.markdown("---")
        st.markdown("#### Backup Database")
        col_b1, col_b2 = st.columns([1, 2])
        with col_b1:
            if st.button("📦 Download Backup", use_container_width=True):
                if DB_PATH.exists():
                    with open(DB_PATH, "rb") as f:
                        data = f.read()
                    st.download_button(
                        "💾 Save activity.db",
                        data,
                        file_name=f"focustrack_backup_{datetime.now().strftime('%Y%m%d_%H%M%S')}.db",
                        mime="application/octet-stream",
                        use_container_width=True,
                    )

        st.markdown("---")
        st.markdown("#### Restore Database")
        uploaded = st.file_uploader("Upload a backup .db file", type=["db"])
        if uploaded:
            if st.button("⚠️ Restore from backup (overwrites current data)"):
                DB_PATH.write_bytes(uploaded.read())
                if "db" in st.session_state:
                    del st.session_state["db"]
                st.toast("✅ Database restored! Please refresh the page.", icon="✅")

        st.markdown("---")
        st.markdown("#### Danger Zone")
        st.markdown(
            "<div style='background:#1a0a0f; border:1px solid #4a1a2a; border-radius:12px; padding:1.25rem; margin-bottom:1rem;'>"
            "<p style='color:#f43f5e; font-weight:600; margin:0 0 8px;'>⚠️ Clear All Data</p>"
            "<p style='color:#9090b0; font-size:0.85rem; margin:0;'>This permanently deletes all tracked activity. This action cannot be undone.</p>"
            "</div>",
            unsafe_allow_html=True,
        )
        confirm = st.text_input("Type DELETE to confirm")
        if st.button("🗑 Clear All Activity Data", type="secondary"):
            if confirm == "DELETE":
                db.clear_all_data()
                st.toast("All data cleared.")
                st.rerun()
            else:
                st.error("Please type DELETE to confirm.")

    # ─── Tab 4: Appearance ────────────────────────────────────────────────────
    with tab4:
        st.markdown("#### Theme")
        current_theme = db.get_setting("theme", "dark")
        theme = st.radio(
            "Color mode",
            ["dark", "light"],
            index=0 if current_theme == "dark" else 1,
            horizontal=True,
        )
        if theme != current_theme:
            db.set_setting("theme", theme)
            st.toast("Theme updated — refresh to apply.")
            st.rerun()

        st.markdown("---")
        st.markdown("#### About FocusTrack")
        st.markdown("""
        <div style="background:#16161f; border:1px solid #2a2a3a; border-radius:12px; padding:1.5rem;">
            <h3 style="font-family:'Syne',sans-serif; margin:0 0 8px; color:#f0f0ff;">FocusTrack v1.0</h3>
            <p style="color:#9090b0; font-size:0.85rem; margin:0 0 4px;">100% local, privacy-first productivity tracker.</p>
            <p style="color:#9090b0; font-size:0.85rem; margin:0 0 4px;">Built with Python 3.11+ · Streamlit · SQLite · Plotly</p>
            <p style="color:#5a5a7a; font-size:0.8rem; margin:0;">No internet • No accounts • No cloud • Your data never leaves your device.</p>
        </div>
        """, unsafe_allow_html=True)