import json, os, shutil, subprocess, time, glob
ROOT="/Users/oscar/.worktree/hot-reload/labs/hot-reload"; REC=f"{ROOT}/target/kan-hot/debug/rustc"
DEPS=f"{ROOT}/target/debug/deps"; SRC=f"{ROOT}/api-common/src/lib.rs"
BASE="/private/var/folders/ft/fkt3bwqd01g7f54wvyz9wgjc0000gn/T/opencode/pipe/out20"
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
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)
FRESH=f"{BASE}/fresh"; os.makedirs(FRESH)
def measure(name,prep,iters=4):
    inc=f"{BASE}/inc_{name}"
    print("===",name)
    for i in range(iters):
        open(SRC,"w").write(orig.replace("nested-v1",f"e20-{name}-{i}"))
        # always compile common into FRESH
        ca=[common["argv"][0]]+strip_owned(common["argv"])+["-C","debuginfo=0","-C","codegen-units=1"]
        j=ca.index("--out-dir"); ca[j+1]=FRESH
        subprocess.run(ca,cwd=common["cwd"],env=dict(common["env"]),stdout=subprocess.DEVNULL,stderr=subprocess.DEVNULL)
        base=[f for f in os.listdir(FRESH) if f.startswith("libapi_common") and f.endswith(".rmeta")][0]
        rmeta=prep(os.path.join(FRESH,base))
        raw=[api["argv"][0]]+[a if not a.startswith("--extern=api_common=") else f"--extern=api_common={rmeta}" for a in api["argv"][1:]]
        aa=[api["argv"][0]]+strip_owned(raw)+["-C","debuginfo=0","-C","codegen-units=8","-C",f"incremental={inc}"]
        j=aa.index("--out-dir"); aa[j+1]=FRESH
        s=time.monotonic(); pa=subprocess.run(aa,cwd=api["cwd"],env=dict(api["env"]),stdout=subprocess.DEVNULL,stderr=subprocess.DEVNULL); ta=(time.monotonic()-s)*1000
        print(f" {i}: api={ta:.1f} rc={pa.returncode} rmeta={rmeta.split('/')[-1]}")
        time.sleep(.15)
def copy_to_deps(p):
    dst=os.path.join(DEPS,"libapi_common-probe.rmeta"); shutil.copy(p,dst); return dst
def copy_to_deps_and_rlib(p):
    dst=copy_to_deps(p)
    rlib=p.replace(".rmeta",".rlib")
    shutil.copy(rlib,os.path.join(DEPS,"libapi_common-probe.rlib"))
    return dst
def deps_without_rlib(p):
    dst=os.path.join(DEPS,os.path.basename(p)); shutil.copy(p,dst)
    for f in glob.glob(os.path.join(DEPS,"libapi_common-*.rlib")): os.remove(f)
    return dst
try:
    measure("fresh",lambda p:p)
    measure("copy_deps_rename",copy_to_deps)
    measure("copy_deps_rlib_rename",copy_to_deps_and_rlib)
    measure("deps_rm_rlib",deps_without_rlib)
finally:
    open(SRC,"w").write(orig)