"""In-flight plan ledgers (superpowers executing-plans / subagent-driven-development):
<ledgers>/<plan>/progress.md, first line `# SDD ledger — plan: <path>`."""
from __future__ import annotations

import re
from pathlib import Path

TASK_RE = re.compile(r"^### Task (\S+?):", re.M)
DONE_RE = re.compile(r"^Task (\S+?): complete", re.M)


def summary(plan_text: str, ledger_text: str) -> str:
    """'done 1, 2; resume at Task 3 (…)' / 'done 1, 2, 3; all tasks done; Final review: …'."""
    planned = TASK_RE.findall(plan_text)
    done = DONE_RE.findall(ledger_text)
    left = [t for t in planned if t not in done]
    finals = [l for l in ledger_text.split("\n") if l.startswith("Final review")]
    head = f"done {', '.join(done) if done else 'none'}"
    if left:
        return f"{head}; resume at Task {left[0]} (task-start PLAN {left[0]})"
    return f"{head}; all tasks done; {finals[-1] if finals else 'final review not dispatched yet'}"


def in_flight(root: Path, ledgers: Path) -> list[str]:
    out = []
    for ledger in sorted(ledgers.glob("*/progress.md")):
        text = ledger.read_text(encoding="utf-8", errors="replace")
        first = text.split("\n", 1)[0]
        plan = first.split("plan:", 1)[1].strip() if "plan:" in first else ""
        plan_path = root / plan
        plan_text = plan_path.read_text(encoding="utf-8", errors="replace") if plan and plan_path.is_file() else ""
        rulings = sum(1 for l in text.split("\n") if "Ruling:" in l)
        out.append(f"- {plan or ledger.parent.name}: {summary(plan_text, text)} "
                   f"({rulings} rulings; ledger {ledger.relative_to(root)})")
    return out