import json,os,shutil,subprocess,time,re
ROOT="/Users/oscar/.worktree/hot-reload/labs/hot-reload"; REC=f"{ROOT}/target/kan-hot/debug/rustc"
SRC=f"{ROOT}/api-common/src/lib.rs"; BASE="/private/var/folders/ft/fkt3bwqd01g7f54wvyz9wgjc0000gn/T/opencode/pipe/outT"
def load(n): return json.load(open(f"{REC}/{n}.json"))
def strip_owned(argv):
    out=[]; i=1
    while i<len(argv):
        a=argv[i]
        if a=="-C" and i+1<len(argv) and any(argv[i+1].startswith(p) for p in ("incremental=","codegen-units=","debuginfo=")): i+=2; continue
        if a.startswith("-C") and any(a[2:].startswith(p) for p in ("incremental=","codegen-units=","debuginfo=")): i+=1; continue
        out.append(a); i+=1
    return out
def rewrite_extern(argv,name,path):
    out=[]; i=0
    while i<len(argv):
        a=argv[i]
        if a=="--extern" and i+1<len(argv) and argv[i+1].startswith(name+"="):
            out+=["--extern",f"{name}={path}"]; i+=2; continue
        if a.startswith(f"--extern={name}="): out.append(f"--extern={name}={path}"); i+=1; continue
        out.append(a); i+=1
    return out
common=load("api_common"); api=load("api"); orig=open(SRC).read(); assert "nested-v1" in orig
shutil.rmtree(BASE,ignore_errors=True); os.makedirs(BASE); d=BASE
def run_api(extra=()):
    rmeta=os.path.join(d,[f for f in os.listdir(d) if f.startswith("libapi_common") and f.endswith(".rmeta")][0])
    aa=rewrite_extern([api["argv"][0]]+strip_owned(api["argv"]),"api_common",rmeta)
    aa+=["-C","debuginfo=0","-C","codegen-units=8","-C",f"incremental={BASE}/inc"]+list(extra)
    j=aa.index("--out-dir"); aa[j+1]=d
    env=dict(api["env"]); env["RUSTC_BOOTSTRAP"]="1"
    s=time.monotonic(); p=subprocess.run(aa,cwd=api["cwd"],env=env,stdout=subprocess.DEVNULL,stderr=subprocess.PIPE,text=True); return (time.monotonic()-s)*1000,p
try:
    for i in range(4):
        open(SRC,"w").write(orig.replace("nested-v1",f"tp-{i}"))
        ca=[common["argv"][0]]+strip_owned(common["argv"])+["-C","debuginfo=0","-C","codegen-units=1"]
        j=ca.index("--out-dir"); ca[j+1]=d
        subprocess.run(ca,cwd=common["cwd"],env=dict(common["env"]),stdout=subprocess.DEVNULL,stderr=subprocess.DEVNULL)
        t,p=run_api(["-Ztime-passes"])
        print(f"iter {i}: wall={t:.1f}ms rc={p.returncode}")
    rows=[]
    for line in p.stderr.splitlines():
        m=re.match(r"time:\s+([0-9.]+);.*?\t(.+)$",line)
        if m: rows.append((float(m.group(1))*1000,m.group(2)))
    rows.sort(reverse=True)
    for ms,name in rows[:25]: print(f"  {ms:7.1f}  {name}")
finally:
    open(SRC,"w").write(orig)