#!/usr/bin/env python3
"""列出可執行的議題。輸入：open.json agents.json tabs.json owner/repo
阻擋關係只認 Gitea 原生 issue dependencies（tea api），不看議題內文。"""
import os, json, re, subprocess, sys

open_issues = json.load(open(sys.argv[1]))
agents = json.load(open(sys.argv[2]))
tabs = json.load(open(sys.argv[3]))
repo = sys.argv[4]

def find(o, k):
    if isinstance(o, dict):
        if k in o: return o[k]
        for v in o.values():
            r = find(v, k)
            if r is not None: return r
    elif isinstance(o, list):
        for v in o:
            r = find(v, k)
            if r is not None: return r

def labels(i): return [l.strip() for l in (i.get("labels") or "").split() if l.strip()] if isinstance(i.get("labels"), str) else [l["name"] for l in i.get("labels") or []]

# Herdr 裡活著的 agent：名稱 issue-N，或掛在標籤 #N 的 tab 上
running = set()
for a in find(agents, "agents") or []:
    m = re.fullmatch(r"issue-(\d+)", str(a.get("name") or ""))
    if m: running.add(m.group(1))
agent_tabs = {a.get("tab_id") for a in find(agents, "agents") or []}
for t in find(tabs, "tabs") or []:
    m = re.fullmatch(r"#(\d+)", str(t.get("label") or ""))
    if m and t.get("tab_id") in agent_tabs: running.add(m.group(1))

def open_blockers(n):
    """擋住 #n 的 open 依賴。tea api 遇到 HTTP 錯誤仍 exit 0，所以回應不是陣列就當失敗，整個停下。"""
    raw = subprocess.run(["tea", "api", "--login", os.environ["HERDR_ISSUE_LOGIN"], "--repo", repo, f"/repos/{{owner}}/{{repo}}/issues/{n}/dependencies"],
                         capture_output=True, text=True).stdout
    try: d = json.loads(raw)
    except Exception: d = None
    if not isinstance(d, list):
        sys.exit(f"gitea: 讀取 #{n} 的依賴失敗：{raw.strip()[:300]}")
    out = []
    for i in d:
        if i.get("state") != "open": continue
        r = (i.get("repository") or {}).get("full_name", "")
        out.append(("#" if r in ("", repo) else r + "#") + str(i["number"]))
    return out

def spec(i):
    return next((l for l in labels(i) if l.startswith("規格/#") or l.startswith("總覽/#")), "")

runnable, stale = [], []
for i in sorted(open_issues, key=lambda x: int(x["index"])):
    ls = labels(i)
    if "ready-for-agent" not in ls: continue
    if "類型/規格" in ls or "類型/總覽" in ls: continue
    n = i["index"]
    if n in running: continue
    if "in-progress" in ls:
        stale.append(n); continue
    if open_blockers(n): continue
    runnable.append((n, spec(i), i["title"]))

if runnable:
    print(f"可執行（{len(runnable)}）：編號\t規格\t標題")
    for n, s, t in runnable:
        print(f"#{n}\t{s}\t{t}")
else:
    print("目前沒有可執行的議題。")
print()
print("Herdr 執行中：" + (" ".join(f"#{n}" for n in sorted(running, key=int)) or "無"))
if stale:
    print("掛 in-progress 但沒有 agent（需處理，重跑 start 會接續）：" + " ".join(f"#{n}" for n in stale))