"""Re-align the released v1.1.0 and v1.1.1 TL biometry plans to v1.0.0's exact
image-level train/test split, WITHOUT re-running the planner.

Why: the split is an image-level partition stored only in each plan's
train_cases[]/test_cases[] arrays. The sorted()-glob fix (dbb2028) landed after
v1.0.0, so v1.1.0 reshuffled ~41% of cases vs v1.0.0 and v1.1.1 inherited that.
This makes all three releases share v1.0.0's split by relabeling (moving case
objects between train/test to match v1.0.0's membership AND order). Annotation
VALUES (slice_profiles, landmark_file, figures) are byte-identical — only the
partition changes. v1.0.0 is the read-only anchor; case sets must already match
(BraTS-MET-00232-000 was removed beforehand).

Derived sidecars carry an informational per-entry "split" label; this refreshes
only those whose source plan is v1.1.0/v1.1.1 (consumers key on
task_ID/image_file/slice_dim/slice_idx and ignore "split", but keep it honest).
removed_samples_v1.0.0_to_* and multi_cluster_samples_v1.0.0_to_v1.1.0 are
sourced from the unchanged v1.0.0 baseline and are left untouched.

Backups of every touched file go to {dataset}/dev/bak/ before any write.
"""

import argparse
import gzip
import json
import shutil
from pathlib import Path

DATASETS = ["KiPA22", "HNTSMRG24", "autoPET-III", "KiTS23", "MSD", "BraTS24"]

V0 = "benchmark_plan_biometry_v1.0.0.json.gz"
V10 = "benchmark_plan_biometry_v1.1.0.json.gz"
V11 = "benchmark_plan_biometry_v1.1.1.json.gz"

# sidecar filename -> which re-aligned plan version supplies its "split" label
# ("v1.1.0"/"v1.1.1"); files sourced from the unchanged v1.0.0 baseline are absent.
SIDECAR_SOURCE = {
    "multi_cluster_samples_v1.1.0.json": "v1.1.0",
    "multi_cluster_samples_v1.1.1.json": "v1.1.1",
    "added_samples_v1.0.0_to_v1.1.0.json": "v1.1.0",
    "added_samples_v1.0.0_to_v1.1.1.json": "v1.1.1",
    "added_samples_v1.1.0_to_v1.1.1.json": "v1.1.1",
    "removed_samples_v1.1.0_to_v1.1.1.json": "v1.1.0",
}


def load_gz(p):
    with gzip.open(p, "rt") as f:
        return json.load(f)


def dump_gz(obj, p):
    with gzip.open(p, "wt") as f:
        json.dump(obj, f)


def v0_partition(plan):
    """task_ID -> {'train': [case_ID in order], 'test': [case_ID in order]}."""
    out = {}
    for t in plan["tasks"]:
        out[t["task_ID"]] = {
            "train": [c["case_ID"] for c in t.get("train_cases", [])],
            "test": [c["case_ID"] for c in t.get("test_cases", [])],
        }
    return out


def realign_plan(plan, target):
    """Repartition each task's cases to match `target` (membership + order).
    Mutates `plan` in place; returns (#moved, side_map) where side_map maps
    (task_ID, image_file) and (task_ID, basename) -> 'train'|'test'."""
    moved = 0
    side_map = {}
    for t in plan["tasks"]:
        tid = t["task_ID"]
        by_id = {c["case_ID"]: c for c in t.get("train_cases", []) + t.get("test_cases", [])}
        tgt = target[tid]
        have = set(by_id)
        want = set(tgt["train"]) | set(tgt["test"])
        if have != want:
            raise SystemExit(
                f"  ABORT task {tid}: case sets differ from v1.0.0 "
                f"(only-here={sorted(have - want)[:5]}, only-v0={sorted(want - have)[:5]})"
            )
        old_train = [c["case_ID"] for c in t.get("train_cases", [])]
        new_train = [by_id[cid] for cid in tgt["train"]]
        new_test = [by_id[cid] for cid in tgt["test"]]
        moved += sum(1 for c in new_train if c["case_ID"] not in set(old_train))
        t["train_cases"] = new_train
        t["test_cases"] = new_test
        t["train_cases_number"] = len(new_train)
        t["test_cases_number"] = len(new_test)
        for side, cases in (("train", new_train), ("test", new_test)):
            for c in cases:
                imf = c["image_file"]
                side_map[(tid, imf)] = side
                side_map[(tid, Path(imf).name)] = side
    return moved, side_map


def patch_sidecar(path, side_map):
    """Refresh the 'split' label of every entry from side_map. Returns
    (changed, total, misses)."""
    with open(path) as f:
        entries = json.load(f)
    changed = misses = 0
    for e in entries:
        key = (e["task_ID"], e["image_file"])
        side = side_map.get(key) or side_map.get((e["task_ID"], Path(e["image_file"]).name))
        if side is None:
            misses += 1
            continue
        if e.get("split") != side:
            e["split"] = side
            changed += 1
    if misses == 0:
        with open(path, "w") as f:
            json.dump(entries, f, indent=2)
    return changed, len(entries), misses


def main():
    ap = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
    ap.add_argument("--data_dir", required=True,
                    help="Root containing per-dataset folders with the plans.")
    ap.add_argument("--dry_run", action="store_true", help="Report only; write nothing.")
    args = ap.parse_args()
    root = Path(args.data_dir)

    for ds in DATASETS:
        d = root / ds
        print("=" * 88)
        print(ds)
        print("=" * 88)
        v0 = load_gz(d / V0)
        target = v0_partition(v0)

        side_maps = {}
        # backup + realign each version's plan
        for ver, fn in (("v1.1.0", V10), ("v1.1.1", V11)):
            plan = load_gz(d / fn)
            moved, side_map = realign_plan(plan, target)
            side_maps[ver] = side_map
            if not args.dry_run:
                bak = d / "dev" / "bak"
                bak.mkdir(parents=True, exist_ok=True)
                shutil.copy2(d / fn, bak / fn)
                dump_gz(plan, d / fn)
            print(f"  {fn}: relabeled, {moved} case(s) moved to match v1.0.0")

        # patch sidecars
        for fn, ver in SIDECAR_SOURCE.items():
            p = d / fn
            if not p.exists():
                continue
            if not args.dry_run:
                bak = d / "dev" / "bak"
                bak.mkdir(parents=True, exist_ok=True)
                shutil.copy2(p, bak / fn)
                changed, total, misses = patch_sidecar(p, side_maps[ver])
            else:
                with open(p) as f:
                    entries = json.load(f)
                sm = side_maps[ver]
                misses = sum(1 for e in entries
                             if (e["task_ID"], e["image_file"]) not in sm
                             and (e["task_ID"], Path(e["image_file"]).name) not in sm)
                changed, total = -1, len(entries)
            flag = f"  !! {misses} unmatched -> NOT written" if misses else ""
            print(f"  {fn}: split refreshed on {changed}/{total} entries (src {ver}){flag}")

    # ---- verification: all three plans share one split (membership + order) ----
    print("=" * 88)
    print("VERIFY: v1.0.0 == v1.1.0 == v1.1.1 (membership + order) per task")
    print("=" * 88)
    allok = True
    for ds in DATASETS:
        d = root / ds
        p0 = v0_partition(load_gz(d / V0))
        p1 = v0_partition(load_gz(d / V10))
        p2 = v0_partition(load_gz(d / V11))
        ok = (p0 == p1 == p2)
        allok &= ok
        detail = "" if ok else "  <-- MISMATCH"
        print(f"  {ds:<13} identical={ok}{detail}")
    print(f"\nALL DATASETS aligned: {allok}")


if __name__ == "__main__":
    main()