#!/usr/bin/env python3
"""backlog.py — Phase 21 near-miss ledger for the automation manager.

The automation's headline DELIVERABLE: every function the worker/grinder got *close* on but
did NOT byte-match is logged here, ranked for Drew's hand-sessions. The byte-gate
(harvest_verify) is the sole arbiter (G3/P9): a byte-MATCH banks and does NOT appear here;
only genuine near-misses/blockers do. Honest by construction.

Two faces:
  .run/backlog.jsonl   append-only machine log (one record per logged attempt; history kept)
  docs/backlog.md      ranked human table (best record per addr; rows that are now matched are dropped)

Record: {ts, addr, name, reach, klass, nins, status, closeness, where_stuck, best_draft, source}
  status   : near | failed | capped | stub      (near = match_one near-miss; capped = matched-but-
             propagation-blocked; stub = loose-typing/irreducible wall; failed = won't compile/gate)
  closeness: int (match_one mismatch count; lower = closer) or None
  where_stuck: the residual class / blocker (e.g. "regalloc-order", "store-vs-load sched",
               "propagation: undeclared callee func_X", "loose-typing arity")
  best_draft : .run/backlog_drafts/<name>.c (saved best draft, so Drew resumes where it stuck)
  source     : worker | grinder | manual

Ranking (hand-session priority): reach desc (x134 leverage), then closeness asc, then nins asc.

Usage:
  tools/backlog.py log --addr 0x.. --name func_.. --reach 134 --class PINS --nins 80 \
      --status near --closeness 6 --where regalloc-order --source worker [--draft path.c]
  tools/backlog.py render        # regenerate docs/backlog.md from .run/backlog.jsonl
  tools/backlog.py show [-n 40]  # print the top N to stdout
Importable: append_record(dict), render(), save_draft(name, text)->path.
"""
import argparse, glob, json, os, re, shutil, time

REPO = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
JSONL = os.path.join(REPO, ".run/backlog.jsonl")
MD = os.path.join(REPO, "docs/backlog.md")
DRAFTS = os.path.join(REPO, ".run/backlog_drafts")
SRC_GLOB = os.path.join(REPO, "src/ov_SC01_077/ov_SC01_077*.c")
STUB_RE = re.compile(r"INCLUDE_ASM\([^,]+,\s*(\w+)\)")
FIELDS = ("ts", "addr", "name", "reach", "klass", "nins", "status",
          "closeness", "where_stuck", "best_draft", "binary", "source",
          # Phase-29 Task-12: structured failure telemetry for the permuter-autopsy loop.
          # residual = masked_diff.structured_diff()[:cap] — [(idx, mine, target), ...]; the WHAT/WHERE
          # of the residual (reg-alloc swap / scheduled-order flip / extra-absent insn). passes_tried =
          # the permuter perm_* passes exercised (from permuter_weights) before the plateau — so the
          # autopsy can tell "the right lever was tried and failed" (wall) from "the lever was never
          # tried" (missing-transform → extend the ILS). Both optional; absent on legacy records.
          "residual", "passes_tried")


def append_record(rec):
    """Normalize + append one record to .run/backlog.jsonl (adds ts if absent)."""
    r = {k: rec.get(k) for k in FIELDS}
    if not r.get("ts"):
        r["ts"] = time.strftime("%Y-%m-%d %H:%M:%S")
    if r.get("addr") and not r.get("name"):
        r["name"] = "func_" + r["addr"].lower().replace("0x", "").upper()
    os.makedirs(os.path.dirname(JSONL), exist_ok=True)
    with open(JSONL, "a") as f:
        f.write(json.dumps(r) + "\n")
    return r


def save_draft(name, text):
    """Persist a best-draft .c so the human picks up where the machine stuck. Returns rel path."""
    os.makedirs(DRAFTS, exist_ok=True)
    p = os.path.join(DRAFTS, f"{name}.c")
    open(p, "w").write(text)
    return os.path.relpath(p, REPO)


_STUB_CACHE = {}


def _open_stubs(binary):
    """INCLUDE_ASM stub names still OPEN in <binary>'s source (main + any _a/_o0 split). Fleet-aware:
    a fn matched in ov_SC01_077 but propagation-stuck stays OPEN in the other overlays (the Phase-19/20
    cap), so the grinder must judge open-ness against the record's OWN binary, not just 077."""
    if binary not in _STUB_CACHE:
        s = set()
        for p in glob.glob(os.path.join(REPO, f"src/{binary}/{binary}*.c")):
            s |= set(STUB_RE.findall(open(p).read()))
        _STUB_CACHE[binary] = s
    return _STUB_CACHE[binary]


def load_best():
    """Best (lowest closeness, latest ts) record per addr, restricted to fns still OPEN in their OWN
    binary (rec['binary']; legacy records default ov_SC01_077). Fleet-aware so a 077-matched-but-
    stuck-local fn surfaces via its overlay record — the grinder must SEE it to grind it (P9 honesty:
    a fn banked in its own binary since logged is dropped)."""
    if not os.path.exists(JSONL):
        return []
    _STUB_CACHE.clear()
    best = {}
    for line in open(JSONL):
        line = line.strip()
        if not line:
            continue
        r = json.loads(line)
        nm = r.get("name")
        binary = r.get("binary") or "ov_SC01_077"
        if nm and nm not in _open_stubs(binary):   # banked in ITS binary since logged -> drop (P9)
            continue
        key = r.get("addr") or nm
        cur = best.get(key)
        c = r.get("closeness")
        cscore = c if isinstance(c, int) else 10 ** 9
        if cur is None or (cscore, r.get("ts", "")) <= (cur[0], cur[1]):
            best[key] = (cscore, r.get("ts", ""), r)
    return [v[2] for v in best.values()]


def _rank_key(r):
    return (-(r.get("reach") or 1),
            r.get("closeness") if isinstance(r.get("closeness"), int) else 10 ** 9,
            r.get("nins") or 10 ** 9)


def render():
    # Parallel workers set BACKLOG_NO_RENDER=1 so concurrent gate_stage runs don't race on
    # docs/backlog.md (render is a read-whole-file + rewrite; appends are atomic, render is not).
    # The orchestrator renders ONCE after the wave. Backward-compatible: unset -> render as before.
    if os.environ.get("BACKLOG_NO_RENDER"):
        return
    recs = sorted(load_best(), key=_rank_key)
    by_status, by_class = {}, {}
    for r in recs:
        by_status[r.get("status")] = by_status.get(r.get("status"), 0) + 1
        by_class[r.get("klass")] = by_class.get(r.get("klass"), 0) + 1
    lines = []
    lines.append("# Backlog — automation near-misses for hand-finishing\n")
    lines.append("> Generated by `tools/backlog.py render` from `.run/backlog.jsonl`. "
                 "These are functions the Phase-21 automation got **close** on but did NOT "
                 "byte-match. The whole-binary byte-gate is the sole arbiter (G3/P9): **byte-matches "
                 "bank and are NOT listed here** — only genuine near-misses/blockers are. Ranked by "
                 "hand-session priority: **reach** (×N propagation leverage) → **closeness** "
                 "(match_one mismatch count, lower = closer) → **size**. Each row's `best_draft` is "
                 "the closest C the machine reached — resume from there.\n")
    lines.append(f"**Open near-misses:** {len(recs)}  ·  by status {by_status}  ·  by class {by_class}\n")
    lines.append("| # | addr | reach | class | nins | status | closeness | where it stuck | best draft |")
    lines.append("|--:|------|------:|-------|-----:|--------|----------:|----------------|------------|")
    for i, r in enumerate(recs, 1):
        c = r.get("closeness")
        lines.append("| {} | {} | {} | {} | {} | {} | {} | {} | {} |".format(
            i, r.get("name") or r.get("addr"), r.get("reach"), r.get("klass") or "", r.get("nins"),
            r.get("status") or "", c if c is not None else "", (r.get("where_stuck") or "").replace("|", "/"),
            f"`{r.get('best_draft')}`" if r.get("best_draft") else ""))
    os.makedirs(os.path.dirname(MD), exist_ok=True)
    open(MD, "w").write("\n".join(lines) + "\n")
    return len(recs)


def main():
    ap = argparse.ArgumentParser()
    sub = ap.add_subparsers(dest="cmd", required=True)
    lg = sub.add_parser("log")
    for fl in ("addr", "name", "klass", "status", "where", "draft", "source"):
        lg.add_argument(f"--{fl if fl != 'klass' else 'class'}", dest=fl, default=None)
    for fl in ("reach", "nins", "closeness"):
        lg.add_argument(f"--{fl}", type=int, default=None)
    sub.add_parser("render")
    sh = sub.add_parser("show"); sh.add_argument("-n", type=int, default=40)
    a = ap.parse_args()
    if a.cmd == "log":
        rec = append_record({"addr": a.addr, "name": a.name, "klass": a.klass, "status": a.status,
                             "where_stuck": a.where, "best_draft": a.draft, "source": a.source,
                             "reach": a.reach, "nins": a.nins, "closeness": a.closeness})
        n = render()
        print(f"logged {rec.get('name') or rec.get('addr')}; backlog open={n}")
    elif a.cmd == "render":
        print(f"docs/backlog.md: {render()} open near-misses")
    elif a.cmd == "show":
        for i, r in enumerate(sorted(load_best(), key=_rank_key)[:a.n], 1):
            print(f"{i:3} {r.get('name'):16} reach={r.get('reach')} {r.get('klass'):7} "
                  f"nins={r.get('nins')} {r.get('status')} close={r.get('closeness')} "
                  f"<{r.get('where_stuck')}>")


if __name__ == "__main__":
    main()