#!/usr/bin/env python3
"""Ensure .claude/settings.local.json env.CLAUDETOOLS_ROOT matches identity.json.

Why: many skill docs invoke `py "$CLAUDETOOLS_ROOT/.claude/skills/.../x.py"`. That
env var is per-machine and was never exported, so the commands resolved to the wrong
path in fresh Git-bash shells (logged in errorlog.md 2026-06-14). Claude Code injects
the `env` block from settings(.local).json into every Bash tool call, so seeding
CLAUDETOOLS_ROOT there from identity.json fixes it fleet-wide. Per-machine value, so it
lives in the gitignored settings.local.json — sourced here from identity.json.

Idempotent. Run from the repo root (or anywhere — paths are resolved off this file).
Takes effect at the NEXT Claude Code session start (env is injected at session init).
"""
import json
import os
import sys

HERE = os.path.dirname(os.path.abspath(__file__))
ROOT = os.path.normpath(os.path.join(HERE, "..", ".."))
IDENT = os.path.join(ROOT, ".claude", "identity.json")
LOCAL = os.path.join(ROOT, ".claude", "settings.local.json")


def main():
    if not os.path.isfile(IDENT):
        print("[ERROR] .claude/identity.json missing — run onboarding first", file=sys.stderr)
        return 1
    ident = json.load(open(IDENT, encoding="utf-8"))
    root = ident.get("claudetools_root")
    if not root:
        print("[ERROR] identity.json has no 'claudetools_root'", file=sys.stderr)
        return 1

    settings = {}
    if os.path.isfile(LOCAL):
        try:
            settings = json.load(open(LOCAL, encoding="utf-8"))
        except Exception as e:
            print(f"[ERROR] settings.local.json is not valid JSON: {e}", file=sys.stderr)
            return 1

    env = settings.setdefault("env", {})
    if env.get("CLAUDETOOLS_ROOT") == root:
        print(f"[OK] CLAUDETOOLS_ROOT already set to {root}")
        return 0

    env["CLAUDETOOLS_ROOT"] = root
    with open(LOCAL, "w", encoding="utf-8") as f:
        json.dump(settings, f, indent=2)
        f.write("\n")
    print(f"[OK] Set CLAUDETOOLS_ROOT={root} in settings.local.json (effective next session)")
    return 0


if __name__ == "__main__":
    sys.exit(main())