"""연속 수식 group의 baseline 채널 주입 방식을 validation에서 선택하고 official test에 고정 적용한다."""

from __future__ import annotations

import argparse
from datetime import datetime, timezone
import json
import math
from pathlib import Path
import sys
from typing import Any, Sequence

import torch

PROJECT_ROOT = Path(__file__).parents[1]
SOURCE_ROOT = PROJECT_ROOT / "src"
for path in (PROJECT_ROOT, SOURCE_ROOT):
    if str(path) not in sys.path:
        sys.path.insert(0, str(path))

from math_grid_drawer.research.trajectory_sequence import visual_label_family
from scripts.audit_math_ink_06_case_context import _load_model06
from scripts.crohme_lattice_common import writer_fit_validation
from scripts.train_crohme_segmentation_lattice_selector import _samples
from scripts.train_math_ink_06_behavior_role import (
    TARGET_LABELS06,
    _canonical_group06,
    _formula_box06,
)
from scripts.train_math_ink_06_skeleton_adapter import _fused_exact_family_logits06


CONTEXT_MODES06 = ("formula", "missing", "local_full", "height_only")


def _parse_args() -> argparse.Namespace:
    """필요 변수: seed별 adapter·CROHME 공식 split. 작동 원리: validation-only context 계약 선택 CLI를 만든다."""

    parser = argparse.ArgumentParser(description="Audit Math Ink 0.6 formula context contract")
    parser.add_argument("--adapter", type=Path, action="append", required=True)
    parser.add_argument(
        "--train-root", type=Path,
        default=PROJECT_ROOT / "research/data/R_noncommercial/ICFHR_package/CROHME2012_data/trainData",
    )
    parser.add_argument(
        "--test-root", type=Path,
        default=PROJECT_ROOT / "research/data/R_noncommercial/ICFHR_package/CROHME2012_data/testDataGT",
    )
    parser.add_argument("--profile", default="median_height_32")
    parser.add_argument("--batch-size", type=int, default=256)
    parser.add_argument("--device", choices=("cuda", "cpu"), default="cuda")
    parser.add_argument("--output", type=Path, required=True)
    return parser.parse_args()


def apply_formula_context_mode06(features: torch.Tensor, mode: str) -> torch.Tensor:
    """필요 변수: N×128×19 canonical feature·mode. 작동 원리: glyph shape는 보존하고 baseline 5채널만 교체한다."""

    if mode not in CONTEXT_MODES06:
        raise ValueError(f"지원하지 않는 formula context mode입니다: {mode}")
    output = features.clone()
    if mode == "formula":
        return output
    if mode == "missing":
        output[..., 10:15] = 0.0
    elif mode == "local_full":
        output[..., 10] = 0.0
        output[..., 11] = 1.0
        output[..., 12] = 1.0
        output[..., 13] = 0.5
        output[..., 14] = 1.0
    else:
        height = output[..., 12].clone()
        output[..., 10] = 0.0
        output[..., 11] = 0.0
        output[..., 12] = height
        output[..., 13] = 0.0
        output[..., 14] = 1.0
    return output


def _materialize_formula_groups06(
    samples: Sequence[dict[str, Any]],
    labels: Sequence[str],
) -> tuple[torch.Tensor, list[str], torch.Tensor]:
    """필요 변수: 공식 formula·model vocabulary. 작동 원리: 정답 group별 sequence와 전체/행동대상 mask를 만든다."""

    allowed = set(str(label) for label in labels)
    sequences = []
    truths: list[str] = []
    target_mask = []
    for formula in samples:
        formula_box = _formula_box06(formula["strokes"])
        for group, label_value in zip(
            formula["truth_groups"], formula["truth_labels"], strict=True,
        ):
            label = str(label_value)
            if label not in allowed:
                continue
            sequences.append(_canonical_group06(group, formula["strokes"], formula_box))
            truths.append(label)
            target_mask.append(label in TARGET_LABELS06)
    if not sequences:
        raise ValueError("지원되는 formula symbol group이 없습니다.")
    return torch.stack(sequences), truths, torch.tensor(target_mask, dtype=torch.bool)


def formula_context_metrics06(
    logits: torch.Tensor,
    truths: Sequence[str],
    labels: Sequence[str],
    target_mask: torch.Tensor,
) -> dict[str, dict[str, float | int]]:
    """필요 변수: exact logit·정답 label·target mask. 작동 원리: 전체와 행동 형태군 slice를 같은 방식으로 평가한다."""

    if len(logits) != len(truths) or len(target_mask) != len(truths):
        raise ValueError("formula context 평가 분모가 서로 다릅니다.")
    predictions = logits.argmax(dim=1).tolist()
    predicted_labels = [str(labels[index]) for index in predictions]

    def summarize(indices: list[int]) -> dict[str, float | int]:
        """필요 변수: slice index. 작동 원리: exact와 visual-family top-1을 반환한다."""

        exact = sum(predicted_labels[index] == truths[index] for index in indices)
        family = sum(
            visual_label_family(predicted_labels[index])
            == visual_label_family(str(truths[index]))
            for index in indices
        )
        return {
            "samples": len(indices),
            "exact_top1": exact / max(len(indices), 1),
            "visual_family_top1": family / max(len(indices), 1),
        }

    all_indices = list(range(len(truths)))
    target_indices = target_mask.nonzero(as_tuple=False).flatten().tolist()
    return {
        "all_supported": summarize(all_indices),
        "behavior_targets": summarize(target_indices),
    }


def formula_context_branch_oracle06(
    logits_by_mode: Sequence[torch.Tensor],
    truths: Sequence[str],
    labels: Sequence[str],
    target_mask: torch.Tensor,
) -> dict[str, dict[str, float | int]]:
    """필요 변수: mode별 logit·정답. 작동 원리: 어느 branch든 맞힌 비배포 상한을 전체/행동 slice로 계산한다."""

    if not logits_by_mode or any(len(logits) != len(truths) for logits in logits_by_mode):
        raise ValueError("context branch oracle 분모가 올바르지 않습니다.")
    predictions = [logits.argmax(dim=1).tolist() for logits in logits_by_mode]

    def summarize(indices: list[int]) -> dict[str, float | int]:
        """필요 변수: slice index. 작동 원리: exact/visual-family branch oracle을 반환한다."""

        exact = family = 0
        for index in indices:
            truth = str(truths[index])
            predicted_labels = [str(labels[row[index]]) for row in predictions]
            exact += int(any(label == truth for label in predicted_labels))
            family += int(any(
                visual_label_family(label) == visual_label_family(truth)
                for label in predicted_labels
            ))
        return {
            "samples": len(indices),
            "exact_oracle": exact / max(len(indices), 1),
            "visual_family_oracle": family / max(len(indices), 1),
        }

    return {
        "all_supported": summarize(list(range(len(truths)))),
        "behavior_targets": summarize(
            target_mask.nonzero(as_tuple=False).flatten().tolist(),
        ),
    }


def _ensemble_logits06(
    features: torch.Tensor,
    adapters: Sequence[Path],
    *,
    mode: str,
    device: torch.device,
    batch_size: int,
) -> tuple[torch.Tensor, tuple[str, ...]]:
    """필요 변수: formula feature·seed adapter·context mode. 작동 원리: seed log-probability ensemble을 계산한다."""

    transformed = apply_formula_context_mode06(features, mode)
    seed_rows = []
    canonical_labels: tuple[str, ...] | None = None
    for adapter_path in adapters:
        payload = torch.load(adapter_path, map_location="cpu", weights_only=False)
        base_checkpoint = Path(str(payload["base_checkpoint"]))
        if not base_checkpoint.is_absolute():
            base_checkpoint = PROJECT_ROOT / base_checkpoint
        engine, adapter = _load_model06(base_checkpoint, adapter_path, device)
        labels = tuple(str(label) for label in engine.labels)
        if canonical_labels is not None and labels != canonical_labels:
            raise ValueError("seed별 vocabulary 순서가 다릅니다.")
        canonical_labels = labels
        rows = []
        engine.model.eval()
        adapter.eval()
        with torch.inference_mode():
            for start in range(0, len(transformed), batch_size):
                batch = transformed[start:start + batch_size].to(device)
                hypotheses = batch.unsqueeze(1).expand(-1, 4, -1, -1).contiguous()
                exact, _family = _fused_exact_family_logits06(
                    engine, adapter, hypotheses,
                )
                rows.append(exact.cpu().log_softmax(dim=1))
        seed_rows.append(torch.cat(rows))
        del engine, adapter
        if device.type == "cuda":
            torch.cuda.empty_cache()
    assert canonical_labels is not None
    ensemble = torch.logsumexp(torch.stack(seed_rows), dim=0) - math.log(len(seed_rows))
    return ensemble, canonical_labels


def main() -> None:
    """필요 변수: writer-validation과 official test. 작동 원리: context mode를 validation에서 잠그고 test에는 선택 mode만 적용한다."""

    args = _parse_args()
    if args.train_root.name.casefold() != "traindata" or args.test_root.name.casefold() != "testdatagt":
        raise ValueError("CROHME2012 공식 trainData/testDataGT 조합만 허용합니다.")
    device = torch.device(args.device)
    if device.type == "cuda" and not torch.cuda.is_available():
        raise RuntimeError("CUDA 감사를 요청했지만 사용할 수 없습니다.")
    first_payload = torch.load(args.adapter[0], map_location="cpu", weights_only=False)
    first_base = Path(str(first_payload["base_checkpoint"]))
    if not first_base.is_absolute():
        first_base = PROJECT_ROOT / first_base
    first_engine, _first_adapter = _load_model06(first_base, args.adapter[0], device)
    labels = first_engine.labels
    del first_engine, _first_adapter
    if device.type == "cuda":
        torch.cuda.empty_cache()
    _fit, validation_samples = writer_fit_validation(args.train_root, args.profile)
    test_samples = _samples(args.test_root, args.profile)
    validation_features, validation_truths, validation_target = _materialize_formula_groups06(
        validation_samples, labels,
    )
    validation_rows = []
    validation_logits_by_mode = []
    for mode in CONTEXT_MODES06:
        logits, current_labels = _ensemble_logits06(
            validation_features, args.adapter, mode=mode,
            device=device, batch_size=args.batch_size,
        )
        validation_rows.append({
            "mode": mode,
            **formula_context_metrics06(
                logits, validation_truths, current_labels, validation_target,
            ),
        })
        validation_logits_by_mode.append(logits)
    selected = max(
        validation_rows,
        key=lambda row: (
            float(row["behavior_targets"]["visual_family_top1"]),
            float(row["all_supported"]["visual_family_top1"]),
            float(row["all_supported"]["exact_top1"]),
            row["mode"] == "formula",
        ),
    )
    test_features, test_truths, test_target = _materialize_formula_groups06(
        test_samples, labels,
    )
    test_logits, test_labels = _ensemble_logits06(
        test_features, args.adapter, mode=str(selected["mode"]),
        device=device, batch_size=args.batch_size,
    )
    report = {
        "experiment": "R-MATH-INK-06-FORMULA-CONTEXT-CONTRACT-001",
        "generated_at": datetime.now(timezone.utc).isoformat(),
        "split_contract": "CROHME trainData writer-validation mode selection; testDataGT one-shot",
        "context_modes": CONTEXT_MODES06,
        "validation_sweep": validation_rows,
        "selected_mode": str(selected["mode"]),
        "selected_validation": selected,
        "validation_branch_oracle": formula_context_branch_oracle06(
            validation_logits_by_mode,
            validation_truths,
            labels,
            validation_target,
        ),
        "official_test": formula_context_metrics06(
            test_logits, test_truths, test_labels, test_target,
        ),
        "track": "R_noncommercial_only",
        "product_validation": False,
        "distillation_allowed": False,
    }
    args.output.parent.mkdir(parents=True, exist_ok=True)
    args.output.write_text(
        json.dumps(report, ensure_ascii=False, indent=2) + "\n",
        encoding="utf-8",
    )
    print(json.dumps(report, ensure_ascii=False, indent=2))


if __name__ == "__main__":
    main()