"""arm 실행 자체(transcript + stage 원장)에서 프로세스 지표를 균일 파생한다 — 하네스 ledger(old arm
엔 없음)에 의존하지 않아 3 arm 동일 잣대."""
import json

import yaml


def derive(transcript_path, stage_ledger_path):
    m = {"input-tokens": 0, "output-tokens": 0, "turns": 0, "subagent-spawns": 0,
         "hook-blocks": 0, "stage-retries": 0, "critique-revisions": 0,
         "execution-failures": 0, "artifacts-produced": 0, "wall-seconds": 0,
         "human-interventions": {"interactive": 0, "pre-authorized-receipts": 0}}
    with open(transcript_path, encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            try:
                ev = json.loads(line)
            except (ValueError, TypeError):
                continue
            if not isinstance(ev, dict):
                continue
            t = ev.get("type")
            if t == "usage":
                m["input-tokens"] += ev.get("input_tokens", 0)
                m["output-tokens"] += ev.get("output_tokens", 0)
            elif t == "turn":
                m["turns"] += 1
            elif t == "agent_spawn":
                m["subagent-spawns"] += 1
            elif t == "hook_block":
                m["hook-blocks"] += 1
            elif t == "human_intervention":
                k = "pre-authorized-receipts" if ev.get("kind") == "pre-authorized" else "interactive"
                m["human-interventions"][k] += 1
    with open(stage_ledger_path, encoding="utf-8") as f:
        led = yaml.safe_load(f) or {}
    for s in led.get("stages", []):
        m["stage-retries"] += s.get("retries", 0)
        m["critique-revisions"] += s.get("critique-revisions", 0)
        m["artifacts-produced"] += len(s.get("artifacts", []))
        m["wall-seconds"] += s.get("wall-seconds", 0)
        if s.get("exit-code", 0) != 0:
            m["execution-failures"] += 1
    return m