"""
PRIORITY 3: Transfer matrix across all available scenarios.

Property-scenario availability:
  restitution: collision, ramp, flat_drop, elasticity, ramp_3prop   (5)
  friction:    ramp, flat_drop, ramp_3prop                          (3)
  mass:        collision (elasticity has constant mass → skip)      (1)

For each property with >=2 scenarios: train on one, test on all.
Subsample all features to [N, 4, D] (fpa=1, 4 agents).

Modes:
  zero-shot       — apply source-trained receiver to target codes
  16-shot         — train new receiver on 16 stratified target examples

Backbones: vjepa2, dinov2, clip. Seeds: 2.
"""
import json, time, sys, os, math
from pathlib import Path
from datetime import datetime, timezone
import numpy as np
import torch
import torch.nn.functional as F

sys.path.insert(0, os.path.dirname(__file__))
from _kinematics_train import (
    ClassifierReceiver,
    HIDDEN_DIM, VOCAB_SIZE, N_HEADS, N_AGENTS, MSG_DIM, BATCH_SIZE,
    SENDER_LR, RECEIVER_LR, EARLY_STOP_PATIENCE, DEVICE,
)
from _killer_experiment import (
    TemporalEncoder, DiscreteSender, DiscreteMultiSender,
)
from _overnight_p1_transfer import (
    build_sender, train_base, eval_zero_shot, train_receiver_frozen_sender,
    make_splits, N_FRAMES_SUBSAMPLE,
)

OUT = Path("results/cross_scenario_transfer")
OUT.mkdir(parents=True, exist_ok=True)
LOG = Path("results/overnight_log.txt")
N_EPOCHS = 150
N_SEEDS = 2

# Feature file locations per (dataset, backbone)
FEATURE_FILES = {
    ("collision",  "vjepa2"): "results/vjepa2_collision_pooled.pt",
    ("collision",  "dinov2"): "results/collision_dinov2_features.pt",
    ("collision",  "clip"):   "results/kinematics_vs_mechanics/clip_collision_features.pt",
    ("ramp",       "vjepa2"): "results/vjepa2_ramp_temporal.pt",
    ("ramp",       "dinov2"): "results/phase54b_dino_features.pt",
    ("ramp",       "clip"):   "results/kinematics_vs_mechanics/clip_ramp_features.pt",
    ("flat_drop",  "vjepa2"): "results/kinematics_vs_mechanics/feat_vjepa2_flat_drop.pt",
    ("flat_drop",  "dinov2"): "results/kinematics_vs_mechanics/feat_dinov2_flat_drop.pt",
    ("flat_drop",  "clip"):   "results/kinematics_vs_mechanics/feat_clip_flat_drop.pt",
    ("elasticity", "vjepa2"): "results/kinematics_vs_mechanics/feat_vjepa2_elasticity.pt",
    ("elasticity", "dinov2"): "results/kinematics_vs_mechanics/feat_dinov2_elasticity.pt",
    ("elasticity", "clip"):   "results/kinematics_vs_mechanics/feat_clip_elasticity.pt",
    ("ramp_3prop", "vjepa2"): "results/kinematics_vs_mechanics/feat_vjepa2_ramp_3prop.pt",
    ("ramp_3prop", "dinov2"): "results/kinematics_vs_mechanics/feat_dinov2_ramp_3prop.pt",
    ("ramp_3prop", "clip"):   "results/kinematics_vs_mechanics/feat_clip_ramp_3prop.pt",
}

LABEL_FILES = {
    "collision":  "results/kinematics_vs_mechanics/labels_collision.npz",
    "ramp":       "results/kinematics_vs_mechanics/labels_ramp.npz",
    "flat_drop":  "results/kinematics_vs_mechanics/labels_flat_drop.npz",
    "elasticity": "results/kinematics_vs_mechanics/labels_elasticity.npz",
    "ramp_3prop": "results/kinematics_vs_mechanics/labels_ramp_3prop.npz",
}

# Property availability
PROPERTY_SCENARIOS = {
    "restitution": ["collision", "ramp", "flat_drop", "elasticity", "ramp_3prop"],
    "friction":    ["ramp", "flat_drop", "ramp_3prop"],
}


def log(msg):
    ts = datetime.now(timezone.utc).strftime("%H:%M:%SZ")
    line = f"[{ts}] P3-matrix: {msg}"
    print(line, flush=True)
    with open(LOG, "a") as f: f.write(line + "\n")


def load_feat_subsampled(dataset, backbone):
    """Return [N, 4, D]. Subsample evenly or duplicate-pad to 4 temporal positions."""
    path = FEATURE_FILES[(dataset, backbone)]
    d = torch.load(path, weights_only=False, map_location="cpu")
    feat = d["features"].float()
    T = feat.shape[1]
    if T >= N_FRAMES_SUBSAMPLE:
        idx = np.linspace(0, T - 1, N_FRAMES_SUBSAMPLE).astype(int)
        feat = feat[:, idx, :].contiguous()
    else:
        # Duplicate-pad. Repeat each position ceil(4/T) times and slice first 4.
        reps = (N_FRAMES_SUBSAMPLE + T - 1) // T
        feat = feat.repeat(1, reps, 1)[:, :N_FRAMES_SUBSAMPLE, :].contiguous()
    return feat


def load_labels(dataset, target):
    z = np.load(LABEL_FILES[dataset])
    key = f"{target}_bin"
    if key not in z:
        return None
    return z[key].astype(np.int64)


def main():
    t0_all = time.time()
    log(f"=== PRIORITY 3: Transfer Matrix ===")

    # Load + cache all features
    feats = {}
    for key, path in FEATURE_FILES.items():
        if Path(path).exists():
            feats[key] = load_feat_subsampled(*key)
            log(f"  {key[0]}/{key[1]}: shape={tuple(feats[key].shape)}")
        else:
            log(f"  MISSING: {path}")

    # Load + validate labels
    labels_cache = {}
    for prop, scenarios in PROPERTY_SCENARIOS.items():
        for ds in scenarios:
            lbl = load_labels(ds, prop)
            if lbl is not None:
                labels_cache[(ds, prop)] = lbl
                log(f"  labels {ds}/{prop}: {np.bincount(lbl, minlength=3).tolist()}")
            else:
                log(f"  labels {ds}/{prop} MISSING")

    # Train all base senders (property, ds, bb, seed) once
    log("\n--- Training base senders ---")
    bases = {}
    for prop, scenarios in PROPERTY_SCENARIOS.items():
        for ds in scenarios:
            if (ds, prop) not in labels_cache: continue
            labels = labels_cache[(ds, prop)]
            for bb in ("vjepa2", "dinov2", "clip"):
                if (ds, bb) not in feats: continue
                for seed in range(N_SEEDS):
                    t0 = time.time()
                    b = train_base(feats[(ds, bb)], labels, seed, n_epochs=N_EPOCHS)
                    bases[(prop, ds, bb, seed)] = b
                    log(f"  {prop}/{ds}/{bb}/seed{seed}: within_acc={b['task_acc']:.3f} [{time.time()-t0:.0f}s]")

    # Build transfer matrix
    log("\n--- Transfer matrix evaluation ---")
    results = []
    for prop, scenarios in PROPERTY_SCENARIOS.items():
        for src in scenarios:
            if (src, prop) not in labels_cache: continue
            for tgt in scenarios:
                if (tgt, prop) not in labels_cache: continue
                for bb in ("vjepa2", "dinov2", "clip"):
                    if (src, bb) not in feats or (tgt, bb) not in feats: continue
                    for seed in range(N_SEEDS):
                        if (prop, src, bb, seed) not in bases: continue
                        base = bases[(prop, src, bb, seed)]
                        tgt_labels = labels_cache[(tgt, prop)]
                        train_ids_tgt, holdout_ids_tgt = make_splits(tgt_labels, seed)

                        # If src == tgt, report within-acc (no transfer)
                        if src == tgt:
                            acc_zs = base["task_acc"]
                            acc_16 = base["task_acc"]
                        else:
                            try:
                                acc_zs = eval_zero_shot(base, feats[(tgt, bb)],
                                                          tgt_labels, holdout_ids_tgt)
                            except Exception as e:
                                log(f"  ERROR zero-shot {prop}/{src}→{tgt}/{bb}/seed{seed}: {e}")
                                acc_zs = float("nan")
                            try:
                                acc_16 = train_receiver_frozen_sender(
                                    base, feats[(tgt, bb)], tgt_labels,
                                    train_ids_tgt, holdout_ids_tgt, seed,
                                    max_examples=16, n_epochs=80)
                            except Exception as e:
                                log(f"  ERROR 16-shot {prop}/{src}→{tgt}/{bb}/seed{seed}: {e}")
                                acc_16 = float("nan")

                        results.append({"property": prop, "src": src, "tgt": tgt,
                                         "backbone": bb, "seed": seed,
                                         "zero_shot_acc": float(acc_zs),
                                         "sixteen_shot_acc": float(acc_16)})

    # Aggregate matrices
    def matrix(prop, bb, mode_key):
        scens = PROPERTY_SCENARIOS[prop]
        M = np.full((len(scens), len(scens)), np.nan)
        for r in results:
            if r["property"] != prop or r["backbone"] != bb: continue
            i = scens.index(r["src"]); j = scens.index(r["tgt"])
            # Average across seeds
            # (gather all matching, avg)
        # Do it by seed-aggregation properly
        for i, src in enumerate(scens):
            for j, tgt in enumerate(scens):
                vals = [r[mode_key] for r in results
                        if r["property"] == prop and r["backbone"] == bb
                        and r["src"] == src and r["tgt"] == tgt]
                if vals:
                    M[i, j] = np.nanmean(vals)
        return M, scens

    lines = []
    lines.append(f"PRIORITY 3: PROPERTY TRANSFER MATRIX (2 seeds, 16-shot mode)")
    lines.append(f"Within-scenario cells (diagonal) show within-dataset training accuracy.")
    lines.append("")
    for prop in PROPERTY_SCENARIOS:
        lines.append(f"\n=== {prop.upper()} ({len(PROPERTY_SCENARIOS[prop])} scenarios) ===")
        for bb in ("vjepa2", "dinov2", "clip"):
            M, scens = matrix(prop, bb, "sixteen_shot_acc")
            if np.all(np.isnan(M)): continue
            lines.append(f"\n  {bb}:")
            head = "  " + "Train\\Test      | " + " | ".join(f"{s[:11]:>11s}" for s in scens)
            lines.append(head)
            lines.append("  " + "-" * (len(head) - 2))
            for i, src in enumerate(scens):
                row = f"  {src[:15]:<15s} | " + " | ".join(
                    f"{M[i,j]*100:>10.1f}%" if not np.isnan(M[i,j]) else f"{'—':>11s}"
                    for j in range(len(scens)))
                lines.append(row)

    # Also zero-shot matrix
    lines.append("\n\nZERO-SHOT MODE (no receiver retraining)")
    for prop in PROPERTY_SCENARIOS:
        lines.append(f"\n=== {prop.upper()} ===")
        for bb in ("vjepa2", "dinov2", "clip"):
            M, scens = matrix(prop, bb, "zero_shot_acc")
            if np.all(np.isnan(M)): continue
            lines.append(f"\n  {bb}:")
            head = "  " + "Train\\Test      | " + " | ".join(f"{s[:11]:>11s}" for s in scens)
            lines.append(head)
            lines.append("  " + "-" * (len(head) - 2))
            for i, src in enumerate(scens):
                row = f"  {src[:15]:<15s} | " + " | ".join(
                    f"{M[i,j]*100:>10.1f}%" if not np.isnan(M[i,j]) else f"{'—':>11s}"
                    for j in range(len(scens)))
                lines.append(row)

    total_s = time.time() - t0_all
    lines.append(f"\n\nTotal P3 runtime: {total_s/60:.1f} min ({total_s:.0f}s)")
    lines.append(f"N transfer evals: {len(results)}")
    lines.append(f"N base senders trained: {len(bases)}")

    summary = "\n".join(lines)
    (OUT / "p3_matrix_summary.txt").write_text(summary + "\n")
    with open(OUT / "p3_matrix_raw.json", "w") as f:
        json.dump({"runs": results, "total_runtime_s": total_s}, f, indent=2, default=str)
    log(f"\n{summary}")
    log(f"\nSaved: {OUT / 'p3_matrix_summary.txt'}")


if __name__ == "__main__":
    main()