"""Pipette mistake / error detection task."""

from __future__ import annotations

from collections import Counter
from pathlib import Path
from typing import Any

from ..io import BENCHMARK_ROOT, read_parquet, select_shard
from ..metrics import bootstrap_sem, classification_scores
from ..parsing import parse_choice_option
from .base import BenchmarkTask, TaskSpec


PMD_OPTIONS = {
    "CORRECT",
    "ERROR_REUSE",
    "ERROR_SURFACE",
    "ERROR_RELEASE",
    "ERROR_INSTALL",
    "ERROR_OTHER",
}
PMD_MISTAKE_TO_OPTION = {
    "none": "CORRECT",
    "reuse_tip": "ERROR_REUSE",
    "reuse_same_media": "ERROR_REUSE",
    "reuse_same_tip": "ERROR_REUSE",
    "surface_contamination": "ERROR_SURFACE",
    "early_release": "ERROR_RELEASE",
    "wrong_tip_for_pipette": "ERROR_INSTALL",
}
PMD_NUMBER_TO_OPTION = {
    "1": "CORRECT",
    "2": "ERROR_REUSE",
    "3": "ERROR_SURFACE",
    "4": "ERROR_RELEASE",
    "5": "ERROR_INSTALL",
    "6": "ERROR_OTHER",
}


def pmd_target_option(label: str, mistake_type: str) -> str:
    return "CORRECT" if label == "correct" else PMD_MISTAKE_TO_OPTION.get(mistake_type, "ERROR_OTHER")


class PmdTask(BenchmarkTask):
    spec = TaskSpec(
        name="pmd",
        display_name="Error Detection",
        default_manifest=BENCHMARK_ROOT / "pmd" / "pmd.parquet",
        sort_key="video_id",
    )
    primary_metric = "binary_balanced_accuracy"

    def load_examples(
        self,
        *,
        benchmark_root: Path = BENCHMARK_ROOT,
        manifest_path: Path | None = None,
        video_root: Path | None = None,
        num_shards: int = 1,
        shard_index: int = 0,
        limit: int | None = None,
    ) -> list[dict[str, Any]]:
        rows = read_parquet(manifest_path or self.default_manifest)
        selected: list[dict[str, Any]] = []
        root = video_root or benchmark_root
        for row in rows:
            rel_video = str(row.get("video_path") or "")
            if not rel_video:
                continue
            video_path = root / rel_video
            target = pmd_target_option(str(row.get("label")), str(row.get("mistake_type")))
            selected.append(
                {
                    **row,
                    "task": self.name,
                    "_video_abs": str(video_path),
                    "target_option": target,
                    "target_binary": "CORRECT" if target == "CORRECT" else "ERROR",
                }
            )
        selected = sorted(selected, key=lambda row: str(row.get("video_id") or ""))
        if limit is not None:
            selected = selected[:limit]
        return select_shard(selected, num_shards, shard_index)

    def parse_record(self, row: dict[str, Any]) -> dict[str, Any]:
        if row.get("error"):
            return row
        pred = parse_choice_option(str(row.get("raw_response") or ""), PMD_OPTIONS, number_map=PMD_NUMBER_TO_OPTION)
        pred_binary = None if pred is None else ("CORRECT" if pred == "CORRECT" else "ERROR")
        target = str(row.get("target_option") or pmd_target_option(str(row.get("label")), str(row.get("mistake_type"))))
        target_binary = "CORRECT" if target == "CORRECT" else "ERROR"
        row.update(
            {
                "target_option": target,
                "target_binary": target_binary,
                "pred_option": pred,
                "pred_binary": pred_binary,
                "pred_parse_ok": pred is not None,
                "binary_correct": pred_binary == target_binary if pred_binary is not None else False,
                "option_correct": pred == target if pred is not None else False,
            }
        )
        return row

    def _summary(self, rows: list[dict[str, Any]]) -> dict[str, Any]:
        parsed = self.parse_rows(rows)
        scored = [row for row in parsed if not row.get("error")]
        binary_pairs: list[tuple[str, str | None]] = []
        option_pairs: list[tuple[str, str | None]] = []
        error_type_pairs: list[tuple[str, str | None]] = []
        for row in scored:
            target = str(row.get("target_option"))
            pred = row.get("pred_option")
            target_binary = "CORRECT" if target == "CORRECT" else "ERROR"
            pred_binary = None if pred is None else ("CORRECT" if pred == "CORRECT" else "ERROR")
            binary_pairs.append((target_binary, pred_binary))
            option_pairs.append((target, None if pred is None else str(pred)))
            if target != "CORRECT":
                error_type_pairs.append((target, None if pred in (None, "CORRECT") else str(pred)))
        binary = classification_scores(binary_pairs, labels=["CORRECT", "ERROR"])
        option = classification_scores(option_pairs, labels=sorted(PMD_OPTIONS))
        error_type = classification_scores(
            error_type_pairs,
            labels=sorted(option for option in PMD_OPTIONS if option != "CORRECT"),
        )
        parse_errors = sum(1 for row in scored if row.get("pred_option") is None)
        return {
            "task": self.name,
            "display_name": self.display_name,
            "rows": len(rows),
            "scored": len(scored),
            "errors": sum(1 for row in rows if row.get("error")),
            "parse_errors": parse_errors,
            "parse_success_rate": (len(scored) - parse_errors) / len(scored) if scored else None,
            "binary_accuracy": binary["accuracy"],
            "binary_balanced_accuracy": binary["balanced_accuracy"],
            "binary_macro_f1": binary["macro_f1"],
            "binary_macro_precision": binary["macro_precision"],
            "binary_macro_recall": binary["macro_recall"],
            "binary_precision": binary["precision"],
            "binary_recall": binary["recall"],
            "binary_f1": binary["f1"],
            "binary_confusion": binary["confusion"],
            "option_accuracy": option["accuracy"],
            "option_balanced_accuracy": option["balanced_accuracy"],
            "option_macro_f1": option["macro_f1"],
            "option_confusion": option["confusion"],
            "error_type_accuracy": error_type["accuracy"],
            "error_type_balanced_accuracy": error_type["balanced_accuracy"],
            "error_type_macro_f1": error_type["macro_f1"],
            "error_type_macro_precision": error_type["macro_precision"],
            "error_type_macro_recall": error_type["macro_recall"],
            "error_type_precision": error_type["precision"],
            "error_type_recall": error_type["recall"],
            "error_type_f1": error_type["f1"],
            "error_type_confusion": error_type["confusion"],
            "target_counts": dict(Counter(str(row.get("target_option")) for row in scored)),
            "pred_counts": dict(Counter(str(row.get("pred_option")) for row in scored)),
        }

    def score(self, rows: list[dict[str, Any]]) -> dict[str, Any]:
        parsed = self.parse_rows(rows)
        summary = self._summary(parsed)
        for metric in (
            "binary_accuracy",
            "binary_balanced_accuracy",
            "binary_macro_f1",
            "binary_macro_precision",
            "binary_macro_recall",
            "error_type_accuracy",
            "error_type_balanced_accuracy",
            "error_type_macro_f1",
            "error_type_macro_precision",
            "error_type_macro_recall",
        ):
            summary[f"{metric}_sem"] = bootstrap_sem(parsed, metric, self._summary, iterations=200)
        return summary