"""Minimal PDF table export with Cyrillic support (fpdf2 + system fonts)."""

from __future__ import annotations

import os
from pathlib import Path
from typing import Any, Sequence

from fpdf import FPDF

_FONT_CANDIDATES = (
    Path("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"),
    Path("/usr/share/fonts/TTF/DejaVuSans.ttf"),
    Path("C:/Windows/Fonts/arial.ttf"),
    Path("C:/Windows/Fonts/Arial.ttf"),
    Path(os.environ.get("WINDIR", "C:/Windows")) / "Fonts" / "arial.ttf",
)


def _resolve_font_path() -> str:
    for candidate in _FONT_CANDIDATES:
        if candidate.exists():
            return str(candidate)
    raise RuntimeError("PDF font not found (install fonts-dejavu-core or use Windows Arial)")


def _truncate(text: Any, max_len: int) -> str:
    value = str(text if text is not None else "")
    if len(value) <= max_len:
        return value
    return value[: max(0, max_len - 1)] + "…"


def build_table_pdf(
    *,
    title: str,
    subtitle_lines: Sequence[str] | None = None,
    headers: Sequence[str],
    rows: Sequence[Sequence[Any]],
    footer_lines: Sequence[str] | None = None,
) -> bytes:
    font_path = _resolve_font_path()
    pdf = FPDF(orientation="P", unit="mm", format="A4")
    pdf.set_auto_page_break(auto=True, margin=15)
    pdf.add_page()
    pdf.add_font("DocFont", "", font_path)
    pdf.set_font("DocFont", size=14)
    effective_width = pdf.w - pdf.l_margin - pdf.r_margin
    pdf.cell(effective_width, 8, _truncate(title, 120), new_x="LMARGIN", new_y="NEXT", align="C")
    pdf.ln(2)

    if subtitle_lines:
        pdf.set_font("DocFont", size=10)
        for line in subtitle_lines:
            if line:
                pdf.multi_cell(effective_width, 5, _truncate(line, 200))
        pdf.ln(2)

    col_count = len(headers)
    if col_count == 0:
        col_count = 1
    page_width = effective_width
    col_width = page_width / col_count

    pdf.set_font("DocFont", size=9)
    for header in headers:
        pdf.cell(col_width, 7, _truncate(header, 40), border=1, align="C")
    pdf.ln()

    pdf.set_font("DocFont", size=9)
    if rows:
        for row in rows:
            for value in row:
                pdf.cell(col_width, 6, _truncate(value, 48), border=1)
            pdf.ln()
    else:
        pdf.cell(page_width, 8, "Нет данных за выбранный период", border=1, align="C")
        pdf.ln()

    if footer_lines:
        pdf.ln(4)
        pdf.set_font("DocFont", size=10)
        for line in footer_lines:
            if line:
                pdf.multi_cell(effective_width, 5, _truncate(line, 200))

    out = pdf.output()
    if isinstance(out, bytearray):
        return bytes(out)
    if isinstance(out, bytes):
        return out
    return str(out).encode("latin-1")