#!/usr/bin/env python3
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"""Code snippet for ring perception."""

from openeye import oechem, oedepict

mol = oechem.OEGraphMol()
oechem.OESmilesToMol(mol, "CC(=O)C1CC2CC(C1C2)Cc3ccc4c(c3)cc[nH]4")
oedepict.OEPrepareDepiction(mol)

width, height = 400, 300
image = oedepict.OEImage(width, height)
opts = oedepict.OE2DMolDisplayOptions(width, height, oedepict.OEScale_AutoScale)
opts.SetAtomColorStyle(oedepict.OEAtomColorStyle_WhiteMonochrome)

num_rings, ring_list = oechem.OEDetermineAromaticRingSystems(mol)

disp = oedepict.OE2DMolDisplay(mol, opts)

highlight = oedepict.OEHighlightByLasso(oechem.OEBlack)
highlight.SetConsiderAtomLabelBoundingBox(True)

ring_pred = oechem.OEPartPredAtom(ring_list)
for ring_idx, color in zip(
    range(1, num_rings + 1), oechem.OEGetVividColors(), strict=False
):
    ring_pred.SelectPart(ring_idx)
    ring_set = oechem.OEAtomBondSet(mol.GetAtoms(ring_pred))
    highlight.SetColor(color)
    oedepict.OEAddHighlighting(disp, highlight, ring_set)

oedepict.OERenderMolecule(image, disp)
oedepict.OEWriteImage("depict_aromatic_ring_system.svg", image)