"""Splitting Ren'Py "simple expression" values out of a line (screens and ATL)."""
import re

OPERATORS = {"+", "-", "*", "/", "//", "%", "**", "==", "!=", "<", ">", "<=", ">=", "and", "or", "in", "is",
             "if", "else", "not"}


def read_value(words: list[str], i: int) -> tuple[str, int]:
    """One property value starting at words[i]. Decompiled sources keep operators unparenthesised
    (``text "Day " + str(day)``), so a value continues while the next word is an operator."""
    parts = [words[i]]
    i += 1
    if parts[0] in ("not", "-") and i < len(words):
        parts.append(words[i])
        i += 1
    while i < len(words):
        if words[i].startswith("(") and re.search(r"[\w\])]$", parts[-1]):  # `ToggleVariable ("x")`
            parts[-1] += words[i]
            i += 1
        elif parts[-1].endswith(",") or parts[-1] in OPERATORS:  # `A(), B()` / `a +` continue
            parts.append(words[i])
            i += 1
        elif i + 1 < len(words) and words[i] in OPERATORS:
            parts.extend([words[i], words[i + 1]])
            i += 2
        else:
            break
    return " ".join(parts), i