"""Telegram HTML formatter for LiteSignal."""
from __future__ import annotations
from .analyzer import LiteSignal

_SIG_EMOJI = {1.0: "🟢", -1.0: "🔴", 0.0: "⚫"}
_SIG_LABEL = {1.0: "LONG  (up-trend)", -1.0: "SHORT (down-trend)", 0.0: "FLAT  (no signal)"}

# Period labels per level per timeframe
_PERIODS: dict[str, list[str]] = {
    "1h":  ["2–4h",    "4–8h",   "8–16h",  "16–32h", "32–64h",  "64–128h", ">128h"],
    "4h":  ["8–16h",   "16–32h", "1–3d",   "3–5d",   "5–11d",   "11–21d",  ">21d"],
    "1d":  ["2–4d",    "4–8d",   "8–16d",  "16–32d", "32–64d",  "64–128d", ">128d"],
    "1wk": ["2–4wk",   "4–8wk",  "8–16wk", "4–8mo",  "8–16mo",  "16–32mo", ">32mo"],
}

_LEVEL_LABELS = ["D1", "D2", "D3", "D4", "D5", "D6", "A6"]
_SCALE_DESC = [
    "microstructure",
    "short reversals",
    "news swings",
    "monthly momentum",
    "quarterly trend",
    "macro positioning",
    "secular drift",
]


def _fmt_price(p: float) -> str:
    if p >= 1000:
        return f"{p:,.2f}"
    if p >= 10:
        return f"{p:.2f}"
    if p >= 1:
        return f"{p:.4f}"
    return f"{p:.6f}"


def _slope_bar(slope: float, scale: float = 5e-5) -> str:
    """5-char visual bar: left=bear, centre=neutral, right=bull."""
    norm = max(-1.0, min(1.0, slope / scale))
    filled = int((norm + 1) / 2 * 5)
    bar = "░" * 5
    bar = bar[:filled] + "█" + bar[filled + 1:]
    return bar[:5]


def format_lite(sig: LiteSignal) -> str:
    sig_emoji = _SIG_EMOJI.get(sig.raw_signal, "❓")
    sig_label = _SIG_LABEL.get(sig.raw_signal, "UNKNOWN")
    lines: list[str] = []

    # ── minimal summary ────────────────────────────────────────────────────────
    lines.append(
        f"🌊 <b>{sig.ticker}</b> | <code>{sig.timeframe}</code> | "
        f"{sig_emoji} <b>{sig_label}</b>"
    )
    lines.append(
        f"Price: <b>{_fmt_price(sig.current_price)}</b> <i>⏱ close last bar</i>  "
        f"Vol(60d): <b>{sig.vol_ann:.1%}</b>"
    )

    d_sig_label = "+".join(f"D{j}" for j in sorted(sig.sig_levels))
    slope_dir = "↑" if sig.midband_slope > 0 else ("↓" if sig.midband_slope < 0 else "→")
    lines.append(
        f"Mid-band ({d_sig_label}) slope: <b>{sig.midband_slope:+.2e}</b> {slope_dir}  "
        f"Sized pos: <b>{sig.sized_position:+.2f}×</b>"
    )
    lines.append(
        f"Lookback: {sig.bars_loaded} bars  |  "
        f"{sig.last_bar_time.strftime('%Y-%m-%d') if hasattr(sig.last_bar_time, 'strftime') else sig.last_bar_time}"
    )
    lines.append("")

    # ── per-level breakdown ────────────────────────────────────────────────────
    lines.append("🔬 <b>MODWT Decomposition (sym8, all levels)</b>")

    periods = _PERIODS.get(sig.timeframe, [""] * 7)
    sig_set = {f"D{j}" for j in sig.sig_levels}

    header = f"<code>{'Lvl':<4} {'Period':<10} {'Dir':<5} {'Slope bar':<7} {'Description'}</code>"
    lines.append(header)
    lines.append("<code>" + "─" * 48 + "</code>")

    for i, label in enumerate(_LEVEL_LABELS):
        direction = sig.level_signals.get(label, 0.0)
        slope = sig.level_slopes.get(label, 0.0)
        d_emoji = _SIG_EMOJI.get(direction, "⚫")
        bar = _slope_bar(slope)
        period = periods[i] if i < len(periods) else ""
        desc = _SCALE_DESC[i] if i < len(_SCALE_DESC) else ""
        is_signal = "◀" if label in sig_set else " "
        lines.append(
            f"<code>{label:<4} {period:<10} </code>{d_emoji}<code> [{bar}] {desc}{is_signal}</code>"
        )

    lines.append("")
    lines.append(
        f"<i>◀ signal levels ({d_sig_label})  |  "
        f"bar position: left=bear · right=bull</i>"
    )
    lines.append("")

    # ── consensus note ────────────────────────────────────────────────────────
    up = sum(1 for v in sig.level_signals.values() if v > 0)
    down = sum(1 for v in sig.level_signals.values() if v < 0)
    total = len(sig.level_signals)
    lines.append(
        f"Consensus: 🟢 {up}/{total} up · 🔴 {down}/{total} down · "
        f"⚫ {total - up - down}/{total} flat"
    )
    lines.append("")

    # ── warnings ──────────────────────────────────────────────────────────────
    if sig.warnings:
        lines.append("⚠️ <b>Warnings:</b>")
        for w in sig.warnings:
            lines.append(f"  <i>{w}</i>")
        lines.append("")

    lines.append(
        f"<i>{sig.timestamp.strftime('%Y-%m-%d %H:%M UTC')} | "
        f"MODWT {d_sig_label} signal | no PyWavelets | not financial advice</i>"
    )
    return "\n".join(lines)