"""Render a 1200x630 Verdict Card as PNG bytes using Pillow (pure-Python fallback).

cairosvg/Cairo is not available on this host, so we draw directly with
PIL.ImageDraw.  The layout matches the SVG template specified in Day 6 GDD.
"""
from __future__ import annotations
import io
from PIL import Image, ImageDraw, ImageFont

# ── colour palette ────────────────────────────────────────────────────────────
_BG          = (14,  10,   8)   # #0e0a08
_BORDER      = (184, 135,  70)  # #b88746
_TEXT_LIGHT  = (241, 231, 208)  # #f1e7d0
_TEXT_GOLD   = (207, 163,  66)  # #cfa342
_TEXT_MUTED  = (138, 114,  80)  # #8a7250

_STAMPS: dict[str, tuple[str, tuple[int, int, int]]] = {
    "just":     ("JUSTICE SERVED", (31,  91,  43)),   # #1f5b2b
    "wrongful": ("INNOCENT LOST",  (110, 18,  18)),   # #6e1212
    "cold":     ("CASE UNSOLVED",  (42,  42,  42)),   # #2a2a2a
    "mistrial": ("MISTRIAL",       (138, 100, 41)),   # #8a6429
}

W, H = 1200, 630


def _font(size: int) -> ImageFont.ImageFont:
    """Return a PIL font at the requested size. Falls back to default."""
    # Try common system serif paths on macOS / Linux
    candidates = [
        "/System/Library/Fonts/Supplemental/Georgia.ttf",
        "/Library/Fonts/Georgia.ttf",
        "/usr/share/fonts/truetype/liberation/LiberationSerif-Regular.ttf",
        "/usr/share/fonts/truetype/dejavu/DejaVuSerif.ttf",
    ]
    for path in candidates:
        try:
            return ImageFont.truetype(path, size)
        except (OSError, IOError):
            pass
    # Last resort: bitmap default (ignores size)
    return ImageFont.load_default()


def _centered_text(draw: ImageDraw.ImageDraw, y: int, text: str,
                   font: ImageFont.ImageFont, fill: tuple) -> None:
    """Draw text horizontally centred on the 1200-px canvas."""
    bbox = draw.textbbox((0, 0), text, font=font)
    tw = bbox[2] - bbox[0]
    draw.text(((W - tw) // 2, y), text, font=font, fill=fill)


def render_png(
    *,
    title: str,
    suspect: str | None,
    method: str,
    suspicion: float,
    shadow: float,
    outcome: str,
) -> bytes:
    """Return PNG bytes for a 1200×630 verdict card."""
    stamp_text, stamp_fill = _STAMPS.get(outcome, ("UNKNOWN", (42, 42, 42)))

    img  = Image.new("RGB", (W, H), _BG)
    draw = ImageDraw.Draw(img)

    # ── border ────────────────────────────────────────────────────────────────
    draw.rectangle([40, 40, W - 40, H - 40], outline=_BORDER, width=3)

    # ── fonts ─────────────────────────────────────────────────────────────────
    f44 = _font(44)
    f28 = _font(28)
    f22 = _font(22)
    f14 = _font(14)
    f42 = _font(42)

    # ── title ─────────────────────────────────────────────────────────────────
    _centered_text(draw, 90, title, f44, _TEXT_LIGHT)

    # ── convicted line ────────────────────────────────────────────────────────
    suspect_str = suspect or "—"
    _centered_text(draw, 165, f"Convicted: {suspect_str}", f28, _TEXT_LIGHT)
    # re-draw the name portion in gold (approximate; just recolour the name)
    name_font = _font(28)
    prefix    = "Convicted: "
    pbbox     = draw.textbbox((0, 0), prefix, font=name_font)
    pw        = pbbox[2] - pbbox[0]
    full_bbox = draw.textbbox((0, 0), f"Convicted: {suspect_str}", font=name_font)
    fw        = full_bbox[2] - full_bbox[0]
    x_start   = (W - fw) // 2
    draw.text((x_start + pw, 165), suspect_str, font=name_font, fill=_TEXT_GOLD)

    # ── method line ───────────────────────────────────────────────────────────
    _centered_text(draw, 215, f"Method: {method}", f22, _TEXT_LIGHT)
    mbbox = draw.textbbox((0, 0), "Method: ", font=f22)
    mw    = mbbox[2] - mbbox[0]
    full2 = draw.textbbox((0, 0), f"Method: {method}", font=f22)
    fw2   = full2[2] - full2[0]
    x2    = (W - fw2) // 2
    draw.text((x2 + mw, 215), method, font=f22, fill=_TEXT_GOLD)

    # ── scores line ───────────────────────────────────────────────────────────
    scores = f"Suspicion: {suspicion:.2f}  ·  Shadow: {shadow:.2f}"
    _centered_text(draw, 265, scores, f22, _TEXT_LIGHT)

    # ── stamp ─────────────────────────────────────────────────────────────────
    stamp_w, stamp_h = 440, 100
    cx, cy = W // 2, 460
    stamp_rect = [
        cx - stamp_w // 2, cy - stamp_h // 2,
        cx + stamp_w // 2, cy + stamp_h // 2,
    ]
    draw.rectangle(stamp_rect, fill=stamp_fill, outline=_TEXT_LIGHT, width=6)
    _centered_text(draw, cy - stamp_h // 2 + 22, stamp_text, f42, _TEXT_LIGHT)

    # ── footer ────────────────────────────────────────────────────────────────
    _centered_text(draw, 555, "Dempster's Court", f14, _TEXT_MUTED)

    # ── serialise ─────────────────────────────────────────────────────────────
    out = io.BytesIO()
    img.save(out, format="PNG")
    return out.getvalue()