"""Génération des planches de badges (module pur, sans base)."""

from app.badges.pdf import (
    BadgeFieldSpec,
    BadgeSpec,
    _cell_origin,
    _grid_size,
    generate_badge_sheets_pdf,
)


def _badge(text="Alex Martin") -> BadgeSpec:
    return BadgeSpec(
        fields=(
            BadgeFieldSpec(
                text=text,
                x_mm=5,
                y_mm=5,
                width_mm=60,
                height_mm=10,
                font_size=12,
                align="LEFT",
                bold=True,
                color="#000000",
            ),
        )
    )


def test_grid_size_fits_a4_with_cr80_badges():
    # A4 (210 × 297 mm), marge 10 mm, gouttière 4 mm, badge CR80 85,6 × 54 mm
    # ⇒ 2 colonnes (190 mm utiles / 89,6 mm par badge+gouttière) x 4 rangées
    # (277 mm utiles / 58 mm par badge+gouttière).
    assert _grid_size() == (2, 4)


def test_cell_origin_places_badges_left_to_right_top_to_bottom():
    cols, _ = _grid_size()
    x0, y0 = _cell_origin(0, cols)
    x1, _ = _cell_origin(1, cols)
    _, y_row2 = _cell_origin(cols, cols)
    assert x1 > x0  # la 2e colonne est à droite de la 1re
    assert y_row2 < y0  # la 2e rangée est plus bas (repère PDF : Y croît vers le haut)


def test_generates_a_valid_pdf_for_a_single_badge():
    pdf = generate_badge_sheets_pdf([_badge()], front_image=None, back_image=None)
    assert pdf.startswith(b"%PDF")
    assert pdf.rstrip().endswith(b"%%EOF")


def test_more_badges_than_one_sheet_produces_a_larger_pdf():
    cols, rows = _grid_size()
    per_page = cols * rows
    one_page = generate_badge_sheets_pdf(
        [_badge() for _ in range(per_page)], front_image=None, back_image=None
    )
    # Un badge de plus déborde sur une 2e planche (recto + verso en plus).
    two_pages = generate_badge_sheets_pdf(
        [_badge() for _ in range(per_page + 1)], front_image=None, back_image=None
    )
    assert len(two_pages) > len(one_page)