# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""Rendering a week, a month or a year.

Same rules as the day block: plain text, no padding, and the count separated
from the name by a dash rather than by spaces that only line up in a terminal.

Longer than the nightly post on purpose. These are asked for, not pushed, so
somebody who typed `!miesiąc` has already agreed to read a month.
"""

from __future__ import annotations

from typing import TYPE_CHECKING, Final

from signal_bot.stats import text
from signal_bot.stats.periods import pl_day_month

if TYPE_CHECKING:
    from signal_bot.stats.periods import Period
    from signal_bot.stats.queries_day import DayRow
    from signal_bot.stats.queries_period import Trend

MEDALS: Final = ("\U0001f947", "\U0001f948", "\U0001f949")
CHART: Final = "\U0001f4ca"
BAR_WIDTH: Final = 10
MAX_ROWS: Final = 12


def bar(share: int) -> str:
    """A share of voice as a text bar. Blocks, because Signal has no charts."""
    filled = round(share / 100 * BAR_WIDTH)
    return "█" * filled + "░" * (BAR_WIDTH - filled)


def trend_line(trend: Trend, what: str) -> str:
    """One line comparing a period with the one before it.

    Says "first one" rather than "0%" when there is no baseline: the group
    should not be told a period is unchanged when there is nothing to have
    changed from.
    """
    if trend.percent is None:
        return f"({what}: pierwszy taki okres w historii)"
    if not trend.delta:
        return f"({what}: dokładnie tyle samo co poprzednio)"
    direction = "więcej" if trend.delta > 0 else "mniej"
    return f"{trend.arrow} {abs(trend.percent)}% {direction} niż {what}"


def _row(row: DayRow, place: int, total: int, *, podium: bool) -> str:
    """One person's line, with a medal or a rank and a share bar."""
    lead = MEDALS[place - 1] if podium and place <= len(MEDALS) else f"{place}."
    share = round(row.messages / total * 100) if total else 0
    return f"{lead} {row.display_name} — {row.messages}  {bar(share)} {share}%"


def render_period(
    period: Period,
    rows: list[DayRow],
    trend: Trend,
    *,
    since: str | None = None,
    podium: bool = False,
) -> str:
    """Compose a period summary."""
    total = sum(row.messages for row in rows)
    media = sum(row.media for row in rows)
    extra = f" ({media} \U0001f4f7)" if media else ""
    lines = [f"{CHART} {period.label} — {text.messages(total)}{extra}"]

    if not rows:
        lines.append("Nikt nic nie napisał.")
        return "\n".join(lines)

    shown = rows[:MAX_ROWS]
    lines.extend(_row(row, i + 1, total, podium=podium) for i, row in enumerate(shown))
    if len(rows) > MAX_ROWS:
        hidden = rows[MAX_ROWS:]
        rest = sum(row.messages for row in hidden)
        lines.append(f"…i {text.people(len(hidden))} więcej (razem {text.messages(rest)})")

    lines.append(trend_line(trend, "poprzednio"))
    if since:
        lines.append(f"(liczymy od {pl_day_month(since)})")
    return "\n".join(lines)