# tools/restructure_imports.py
"""One-shot codemod: rewrite proteus import paths for the game/web restructure.

Usage:
    python tools/restructure_imports.py <file_or_dir> [<file_or_dir> ...]

NEVER run this on tools/ — this file contains the rule strings themselves.

Rules apply IN ORDER (most-specific first) so prefix collisions resolve
correctly:
  * grid.scenarios (plural) before grid.scenario (singular) before grid (bare)
  * runtime.metrics/persona/rollout/aggregate before runtime (bare)
Each rule matches a dotted path at a word boundary so 'proteus.grid' does not
hit 'proteus.gridx', and (because longer rules run first) does not pre-empt
'proteus.grid.game'.
"""
from __future__ import annotations

import re
import sys
from pathlib import Path

RULES: list[tuple[str, str]] = [
    # grid family — plural, then singular, then submodules, then bare
    ("proteus.grid.scenarios",  "proteus.game.scenarios"),
    ("proteus.grid.scenario",   "proteus.game.scenarios.base"),
    ("proteus.grid.game",       "proteus.game.engine.grid"),
    ("proteus.grid.difficulty", "proteus.game.engine.difficulty"),
    ("proteus.grid.ascii_view", "proteus.game.engine.ascii_view"),
    ("proteus.grid",            "proteus.game.scenarios"),
    # arc_grid (engine + rendering)
    ("proteus.arc_grid",        "proteus.game.engine"),
    # runtime — metrics group out to game.metrics (specific first), then bare
    ("proteus.runtime.metrics",   "proteus.game.metrics.metrics"),
    ("proteus.runtime.persona",   "proteus.game.metrics.persona"),
    ("proteus.runtime.rollout",   "proteus.game.metrics.rollout"),
    ("proteus.runtime.aggregate", "proteus.game.metrics.aggregate"),
    ("proteus.runtime",         "proteus.game.runtime"),
    # agents / viz
    ("proteus.agents",          "proteus.game.agents"),
    ("proteus.viz",             "proteus.game.viz"),
    # web -> web.local  (arena is new; no old refs)
    ("proteus.web",             "proteus.web.local"),
]

COMPILED = [(re.compile(r"\b" + re.escape(old) + r"(?![\w])"), new)
            for old, new in RULES]


def rewrite(text: str) -> str:
    for pat, new in COMPILED:
        text = pat.sub(new, text)
    return text


def iter_py(paths: list[str]):
    for p in paths:
        path = Path(p)
        if path.is_dir():
            yield from sorted(path.rglob("*.py"))
        elif path.suffix == ".py":
            yield path


def main(argv: list[str]) -> int:
    changed = 0
    for path in iter_py(argv):
        old = path.read_text()
        new = rewrite(old)
        if new != old:
            path.write_text(new)
            changed += 1
            print(f"rewrote {path}")
    print(f"--- {changed} files changed ---")
    return 0


if __name__ == "__main__":
    raise SystemExit(main(sys.argv[1:]))