"""Top Movers component — day gainers, losers, most active."""
from html import escape

import streamlit as st
import yfinance as yf

DEFAULT_VISIBLE_MOVERS = 3
MAX_MOVERS = 8


def _toggle_mover_tab(state_key: str):
    st.session_state[state_key] = not st.session_state.get(state_key, False)


def _inject_styles():
    st.markdown(
        """
        <style>
          .prism-mover-list {
            display: grid;
            gap: 0.12rem;
          }
          .prism-mover-row {
            display: grid;
            grid-template-columns: minmax(72px, 0.8fr) minmax(0, 2.6fr) minmax(90px, 1fr) minmax(110px, 1.1fr);
            gap: 0.85rem;
            align-items: center;
            padding: 0.18rem 0;
          }
          .prism-mover-symbol {
            font-size: 1rem;
            font-weight: 700;
            line-height: 1.1;
          }
          .prism-mover-name {
            color: #9aa0b0;
            font-size: 0.84rem;
            line-height: 1.15;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
          }
          .prism-mover-price {
            font-size: 0.98rem;
            line-height: 1.1;
          }
          .prism-mover-change {
            font-size: 0.98rem;
            font-weight: 600;
            line-height: 1.1;
          }
          .prism-mover-change-meta {
            font-size: 0.74rem;
            color: #9aa0b0;
            margin-left: 0.2rem;
          }
          @media (max-width: 900px) {
            .prism-mover-row {
              grid-template-columns: minmax(68px, 0.9fr) minmax(0, 2.2fr) minmax(82px, 1fr) minmax(96px, 1fr);
              gap: 0.55rem;
            }
          }
        </style>
        """,
        unsafe_allow_html=True,
    )


@st.cache_data(ttl=180)
def _fetch_movers(screen: str, count: int = MAX_MOVERS) -> list[dict]:
    try:
        result = yf.screen(screen, count=count)
        return result.get("quotes", [])
    except Exception:
        return []


def _fmt_price(val) -> str:
    try:
        return f"${float(val):,.2f}"
    except Exception:
        return "—"


def _mover_row_html(q: dict) -> str:
    symbol = escape(str(q.get("symbol", "")))
    name = escape(str(q.get("shortName") or q.get("longName") or symbol))
    price = q.get("regularMarketPrice")
    chg_pct = q.get("regularMarketChangePercent")
    chg_abs = q.get("regularMarketChange")

    try:
        chg_f = float(chg_pct)
        color = "#2ecc71" if chg_f >= 0 else "#e74c3c"
        sign = "+" if chg_f >= 0 else ""
        pct_str = f"{sign}{chg_f:.2f}%"
    except Exception:
        color = "#9aa0b0"
        pct_str = "—"

    try:
        abs_str = f"({'+' if float(chg_abs) >= 0 else ''}{float(chg_abs):.2f})"
    except Exception:
        abs_str = ""
    abs_str = escape(abs_str)

    return (
        "<div class='prism-mover-row'>"
        f"<div class='prism-mover-symbol'>{symbol}</div>"
        f"<div class='prism-mover-name'>{name}</div>"
        f"<div class='prism-mover-price'>{_fmt_price(price)}</div>"
        "<div>"
        f"<span class='prism-mover-change' style='color:{color}'>{pct_str}</span>"
        f"<span class='prism-mover-change-meta'>{abs_str}</span>"
        "</div>"
        "</div>"
    )


def _render_mover_tab(screen: str, state_key: str):
    quotes = _fetch_movers(screen)
    if not quotes:
        st.caption("No data available.")
        return

    expanded = st.session_state.get(state_key, False)
    visible_count = len(quotes) if expanded else min(DEFAULT_VISIBLE_MOVERS, len(quotes))

    rows_html = "".join(_mover_row_html(q) for q in quotes[:visible_count])
    st.markdown(f"<div class='prism-mover-list'>{rows_html}</div>", unsafe_allow_html=True)

    if len(quotes) > DEFAULT_VISIBLE_MOVERS:
        button_label = "Show Less" if expanded else f"Show More ({len(quotes) - DEFAULT_VISIBLE_MOVERS} more)"
        st.button(
            button_label,
            key=f"{state_key}_button",
            use_container_width=True,
            on_click=_toggle_mover_tab,
            args=(state_key,),
        )


@st.fragment
def render_top_movers():
    _inject_styles()
    st.markdown("#### 🔥 Top Movers")

    tab_gainers, tab_losers, tab_active = st.tabs([
        "📈 Gainers", "📉 Losers", "⚡ Most Active"
    ])

    screens = {
        "gainers": "day_gainers",
        "losers": "day_losers",
        "active": "most_actives",
    }

    with tab_gainers:
        _render_mover_tab(screens["gainers"], "top_movers_gainers_expanded")

    with tab_losers:
        _render_mover_tab(screens["losers"], "top_movers_losers_expanded")

    with tab_active:
        _render_mover_tab(screens["active"], "top_movers_active_expanded")