#!/usr/bin/env python3
from __future__ import annotations

import argparse
from collections import Counter
from datetime import datetime
import json
import os
from pathlib import Path
import sys
import time
from typing import Any


ROOT = Path(__file__).resolve().parent.parent
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from push_up.analysis_service import TEMPLATE_SOURCE, analyze_pushup, prepare_template_cache
from push_up.processor import VideoProcessor


VIDEO_EXTENSIONS = {".mp4", ".mov", ".m4v", ".avi", ".webm"}
DEFAULT_TESTS_DIR = ROOT / "data" / "tests"
DEFAULT_OUTPUT_DIR = ROOT / "analysis_artifacts" / "video_test_runs"
EXPECTED_REJECTION_LABELS = {"vo_teakwondo"}


def parse_args() -> argparse.Namespace:
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    parser = argparse.ArgumentParser(
        description="Run push-up analysis against every video in data/tests and write one JSON result file."
    )
    parser.add_argument(
        "--tests-dir",
        type=Path,
        default=DEFAULT_TESTS_DIR,
        help="Directory containing test videos. Default: data/tests",
    )
    parser.add_argument(
        "--output",
        type=Path,
        default=DEFAULT_OUTPUT_DIR / f"pushup_eval_{timestamp}.json",
        help="Single JSON file to write. Default: analysis_artifacts/video_test_runs/pushup_eval_<timestamp>.json",
    )
    parser.add_argument(
        "--artifact-root",
        type=Path,
        default=DEFAULT_OUTPUT_DIR / f"artifacts_{timestamp}",
        help="Root directory for annotated images when --save-artifacts is used.",
    )
    parser.add_argument(
        "--save-artifacts",
        action="store_true",
        help="Save per-rep annotated student/expert frames. Also enables deterministic rule-based arrows.",
    )
    parser.add_argument(
        "--enable-vlm",
        action="store_true",
        help="Allow NVIDIA VLM calls for per-rep text feedback. By default VLM is disabled for repeatable tests.",
    )
    parser.add_argument(
        "--include-template",
        action="store_true",
        help="Also test template video against itself.",
    )
    return parser.parse_args()


def main() -> int:
    args = parse_args()
    tests_dir = (ROOT / args.tests_dir).resolve() if not args.tests_dir.is_absolute() else args.tests_dir
    output_path = (ROOT / args.output).resolve() if not args.output.is_absolute() else args.output
    artifact_root = (
        (ROOT / args.artifact_root).resolve() if not args.artifact_root.is_absolute() else args.artifact_root
    )

    if not tests_dir.exists():
        print(f"[error] Test directory does not exist: {tests_dir}")
        return 1

    videos = discover_videos(tests_dir)
    if args.include_template:
        videos = [TEMPLATE_SOURCE] + videos

    if not videos:
        print(f"[error] No test videos found in: {tests_dir}")
        return 1

    if not args.enable_vlm:
        os.environ["NVIDIA_API_KEY"] = "nvapi-..."

    print(f"[setup] template={TEMPLATE_SOURCE}")
    print(f"[setup] tests_dir={tests_dir}")
    print(f"[setup] output={output_path}")
    print(f"[setup] save_artifacts={args.save_artifacts}")
    print(f"[setup] vlm={'enabled' if args.enable_vlm else 'disabled'}")
    prepare_template_cache()

    batch_started = time.perf_counter()
    results = []
    for index, video_path in enumerate(videos, start=1):
        label = video_path.stem if video_path != TEMPLATE_SOURCE else "template_vs_template"
        print("=" * 88)
        print(f"[case {index}/{len(videos)}] {label}")
        print(f"[video] {video_path}")

        started = time.perf_counter()
        orientation = orientation_label(video_path)
        try:
            result = analyze_pushup(
                video_path,
                artifact_root if args.save_artifacts else None,
                save_artifacts=args.save_artifacts,
            )
            elapsed = time.perf_counter() - started
            entry = compact_result(
                label=label,
                video_path=video_path,
                orientation=orientation,
                elapsed_seconds=elapsed,
                result=result,
            )
        except Exception as exc:
            elapsed = time.perf_counter() - started
            entry = {
                "label": label,
                "video_path": project_relative_path(video_path),
                "orientation": orientation,
                "elapsed_seconds": round(elapsed, 2),
                "error": f"{type(exc).__name__}: {exc}",
                "ok": False,
            }

        results.append(entry)
        print_case_summary(entry)

    payload = {
        "created_at": datetime.now().isoformat(timespec="seconds"),
        "tests_dir": project_relative_path(tests_dir),
        "template_video_path": project_relative_path(TEMPLATE_SOURCE),
        "save_artifacts": args.save_artifacts,
        "artifact_root": project_relative_path(artifact_root) if args.save_artifacts else "",
        "vlm_enabled": args.enable_vlm,
        "total_videos": len(results),
        "passed_videos": sum(1 for item in results if item.get("ok")),
        "failed_videos": sum(1 for item in results if not item.get("ok")),
        "elapsed_seconds": round(time.perf_counter() - batch_started, 2),
        "error_distribution": error_distribution(results),
        "results": results,
    }

    output_path.parent.mkdir(parents=True, exist_ok=True)
    with output_path.open("w", encoding="utf-8") as file:
        json.dump(payload, file, ensure_ascii=False, indent=2)

    print("=" * 88)
    print(f"[done] wrote {output_path}")
    print(f"[done] passed={payload['passed_videos']} failed={payload['failed_videos']}")
    return 0 if payload["failed_videos"] == 0 else 1


def discover_videos(tests_dir: Path) -> list[Path]:
    return sorted(
        path
        for path in tests_dir.rglob("*")
        if path.is_file() and path.suffix.lower() in VIDEO_EXTENSIONS
    )


def orientation_label(video_path: Path) -> str:
    try:
        processor = VideoProcessor()
        needs_flip = processor._detect_orientation(str(video_path))
    except Exception as exc:
        return f"unknown: {type(exc).__name__}: {exc}"
    return "head-left -> flipped" if needs_flip else "head-right/no-flip"


def compact_result(
    *,
    label: str,
    video_path: Path,
    orientation: str,
    elapsed_seconds: float,
    result: dict[str, Any],
) -> dict[str, Any]:
    if result.get("error"):
        expected_rejection = label in EXPECTED_REJECTION_LABELS
        return {
            "label": label,
            "video_path": project_relative_path(video_path),
            "orientation": orientation,
            "elapsed_seconds": round(elapsed_seconds, 2),
            "ok": expected_rejection,
            "expected_rejection": expected_rejection,
            "error": result["error"],
        }

    return {
        "label": label,
        "video_path": project_relative_path(video_path),
        "orientation": orientation,
        "elapsed_seconds": round(elapsed_seconds, 2),
        "ok": True,
        "expected_rejection": False,
        "error": None,
        "overall_score_pct": result.get("overall_score_pct"),
        "student_reps": result.get("student_reps"),
        "expert_reps": result.get("expert_reps"),
        "good_reps": result.get("good_reps"),
        "serious_reps": result.get("serious_reps"),
        "summary": result.get("summary", ""),
        "main_errors": result.get("main_errors", []),
        "student_video_path": result.get("student_video_path", ""),
        "rep_results": [compact_rep(rep) for rep in result.get("rep_results", [])],
    }


def compact_rep(rep: dict[str, Any]) -> dict[str, Any]:
    return {
        "rep_num": rep.get("rep_num"),
        "score_pct": rep.get("score_pct"),
        "rule_score_pct": rep.get("rule_score_pct"),
        "dtw_score_pct": rep.get("dtw_score_pct"),
        "status": rep.get("status"),
        "primary_error": rep.get("primary_error"),
        "error_labels": rep.get("error_labels", []),
        "rule_feedback": rep.get("rule_feedback") or rep.get("feedback", ""),
        "llm_feedback": rep.get("llm_feedback", ""),
        "llm_feedback_source": rep.get("llm_feedback_source", ""),
        "llm_feedback_error": rep.get("llm_feedback_error", ""),
        "llm_visual_error_label": rep.get("llm_visual_error_label", ""),
        "llm_arrow": rep.get("llm_arrow"),
        "student_frame_path": rep.get("student_frame_path", ""),
        "expert_frame_path": rep.get("expert_frame_path", ""),
    }


def print_case_summary(entry: dict[str, Any]) -> None:
    if not entry.get("ok"):
        print(f"[result] ERROR: {entry.get('error')}")
        print(f"[time] {entry.get('elapsed_seconds')}s")
        return

    if entry.get("expected_rejection"):
        print(f"[result] EXPECTED_REJECTION: {entry.get('error')}")
        print(f"[time] {entry.get('elapsed_seconds')}s")
        return

    print(
        "[result] "
        f"overall={entry.get('overall_score_pct')}%, "
        f"student_reps={entry.get('student_reps')}, "
        f"expert_reps={entry.get('expert_reps')}, "
        f"good_reps={entry.get('good_reps')}, "
        f"serious_reps={entry.get('serious_reps')}"
    )
    print(f"[summary] {entry.get('summary', '')}")
    for rep in entry.get("rep_results", []):
        errors = ", ".join(rep.get("error_labels") or []) or "none"
        print(
            "  "
            f"rep={int(rep['rep_num']):02d} "
            f"score={rep.get('score_pct')}% "
            f"status={rep.get('status')} "
            f"errors={errors}"
        )
    print(f"[time] {entry.get('elapsed_seconds')}s")


def error_distribution(results: list[dict[str, Any]]) -> dict[str, int]:
    counter: Counter[str] = Counter()
    for result in results:
        for error in result.get("main_errors", []):
            label = error.get("label") or error.get("type") or "unknown"
            counter[label] += int(error.get("count") or 0)
    return dict(counter.most_common())


def project_relative_path(path: Path) -> str:
    try:
        return path.resolve().relative_to(ROOT).as_posix()
    except ValueError:
        return path.resolve().as_posix()


if __name__ == "__main__":
    raise SystemExit(main())