#!/usr/bin/env python
"""Final comparison: chosen checkpoint (steps2000) on the full 160-edit
held-out set at 40 steps, run twice: with the transparency suffix (deployed
usage, matches training captions) and without (apples-to-apples with the
baselines, which ran bare instructions). Reuses eval_edit.py's pipeline,
metrics and seeding so numbers are directly comparable to the baseline run.

Usage:
  python final_eval.py --lora /ckpts/orbit_alpha_lora.safetensors --out /out/final
"""
import argparse, json, os, sys

import eval_edit as E


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument('--lora', required=True)
    ap.add_argument('--out', required=True)
    args = ap.parse_args()

    pairs = [json.loads(l) for l in open(E.get_file('pairs_eval.jsonl'))]
    assert len(pairs) == 160, f'expected 160 eval pairs, got {len(pairs)}'

    pipe = E.load_pipe()
    m = E.make_metrics()
    pipe.load_lora_weights(args.lora)

    for variant, suffix in (('no_suffix', ''), ('suffix', ' ' + E.ALPHA_SUFFIX)):
        pv = [dict(p, instruction=p['instruction'] + suffix) for p in pairs]
        r = E.run_pairs(pipe, m, pv, 'instruction', os.path.join(args.out, variant))
        E.agg(r, f'FINAL/{variant}')

    # side-by-side contact sheet: pred-with-suffix vs GT for 12 objects
    try:
        from PIL import Image
        sheet_pairs = pairs[::13][:12]
        tiles = []
        for p in sheet_pairs:
            pred = Image.open(os.path.join(args.out, 'suffix', p['pair_id'] + '.png'))
            gt = Image.open(E.get_file(p['target_file'])).convert('RGBA')
            for im in (pred, gt):
                bg = Image.new('RGB', im.size, (128, 128, 128))
                bg.paste(im, mask=im.split()[3])
                tiles.append(bg.resize((256, 256)))
        sheet = Image.new('RGB', (256 * 4, 256 * 6), (30, 30, 30))
        for i, t in enumerate(tiles):
            sheet.paste(t, ((i % 4) * 256, (i // 4) * 256))
        sheet.save(os.path.join(args.out, 'final_sheet.png'))
        print('sheet written', flush=True)
    except Exception as e:
        print(f'sheet failed (non-fatal): {e}', flush=True)

    print('DONE', flush=True)


if __name__ == '__main__':
    main()