#!/usr/bin/env python3
"""Run a single-fna BtToxin_Digger -> Shotter -> Plots pipeline.

- Input: one .fna file (nucleotide scaffold)
- Steps:
  1) Stage this single file, run BtToxin_Digger via PixiRunner (pixi environment)
  2) Run Shotter scoring on Digger's All_Toxins.txt via pixi run -e pipeline
  3) Render heatmaps + paper-style report via pixi run -e pipeline
  4) Organize outputs under one root folder:
     <out_root>/
       ├─ digger/   (pixi digger env outputs)
       ├─ shotter/  (Shotter TSV/JSON + plots + report)
       └─ pipeline_results.tar.gz (bundle)

Notes
- Digger is executed in the pixi 'digger' environment with bioconda dependencies.
- Shotter and plotting are executed in the pixi 'pipeline' environment with Python dependencies.
- This script exposes CLI flags for Shotter filters to allow strict/loose runs.
- 默认使用 external_dbs/bt_toxin 作为外部数据库（若存在）。

Example
  python scripts/run_single_fna_pipeline.py \\
    --fna tests/test_data/HAN055.fna \\
    --toxicity_csv Data/toxicity-data.csv \\
    --out_root runs/HAN055_run \\
    --min_identity 0.50 --min_coverage 0.60 \\
    --disallow_unknown_families --require_index_hit --lang zh

  # 使用自定义数据库路径
  python scripts/run_single_fna_pipeline.py \\
    --fna tests/test_data/HAN055.fna \\
    --bttoxin_db_dir /path/to/custom/bt_toxin

  # 使用 pixi 任务运行
  pixi run pipeline --fna tests/test_data/HAN055.fna
"""
from __future__ import annotations

import argparse
import os
import shutil
import subprocess
import sys
import tarfile
from pathlib import Path
from typing import Dict, Any, List

# Import PixiRunner and command builders from scripts
from pixi_runner import PixiRunner, build_shotter_command, build_plot_command


def _shell(cmd: list[str]) -> subprocess.CompletedProcess:
    return subprocess.run(cmd, text=True)


def _read_first_strain(strain_scores_tsv: Path) -> str:
    try:
        with strain_scores_tsv.open("r", encoding="utf-8") as f:
            header = f.readline().strip().split("\t")
            idx_strain = header.index("Strain")
            # next non-empty line
            for line in f:
                if not line.strip():
                    continue
                parts = line.rstrip("\n").split("\t")
                if len(parts) > idx_strain:
                    return parts[idx_strain]
    except Exception:
        pass
    return ""


def run_single_fna_pipeline(
    fna_path: Path,
    out_root: Path,
    toxicity_csv: Path = Path("Data/toxicity-data.csv"),
    min_identity: float = 0.0,
    min_coverage: float = 0.0,
    allow_unknown_families: bool = True,
    require_index_hit: bool = False,
    lang: str = "zh",
    bttoxin_db_dir: Path | None = None,
    threads: int = 4,
) -> Dict[str, Any]:
    """运行单个 fna 文件的完整 pipeline（使用 pixi 环境）。

    Args:
        fna_path: 输入 .fna 文件路径
        out_root: 输出根目录
        toxicity_csv: 毒性数据 CSV 文件路径
        min_identity: 最小 identity 阈值
        min_coverage: 最小 coverage 阈值
        allow_unknown_families: 是否允许未知家族
        require_index_hit: 是否要求索引命中
        lang: 报告语言 (zh/en)
        bttoxin_db_dir: 外部 bt_toxin 数据库目录。若为 None，则自动检测
                       项目根目录下的 external_dbs/bt_toxin。
        threads: 线程数
    """
    fna_path = fna_path.resolve()
    out_root = out_root.resolve()
    out_root.mkdir(parents=True, exist_ok=True)

    # 自动检测外部数据库
    if bttoxin_db_dir is None:
        default_db = Path(__file__).resolve().parents[1] / "external_dbs" / "bt_toxin"
        if default_db.exists() and (default_db / "db").exists():
            bttoxin_db_dir = default_db
            print(f"[pipeline] 使用外部数据库: {bttoxin_db_dir}")
        else:
            print("[pipeline] 未找到外部数据库，将使用 pixi 环境内置数据库")

    digger_dir = out_root / "digger"
    shotter_dir = out_root / "shotter"
    logs_dir = out_root / "logs"
    stage_dir = out_root / "stage"
    for d in (digger_dir, shotter_dir, logs_dir, stage_dir):
        d.mkdir(parents=True, exist_ok=True)

    # Stage single input file
    staged_fna = stage_dir / fna_path.name
    shutil.copy2(fna_path, staged_fna)

    # 1) Run BtToxin_Digger via PixiRunner (pixi digger environment)
    runner = PixiRunner(env_name="digger")
    result = runner.run_bttoxin_digger(
        input_dir=stage_dir,
        output_dir=digger_dir,
        log_dir=logs_dir,
        sequence_type="nucl",
        scaf_suffix=fna_path.suffix or ".fna",
        threads=threads,
        bttoxin_db_dir=bttoxin_db_dir,
    )
    if not result.get("success"):
        return {
            "ok": False,
            "stage": "digger",
            "error": result.get("error") or f"Digger failed (exit={result.get('exit_code')})",
            "logs": (logs_dir / "digger_execution.log").read_text(encoding="utf-8") if (logs_dir / "digger_execution.log").exists() else "",
        }

    toxins_dir = digger_dir / "Results" / "Toxins"
    all_toxins = toxins_dir / "All_Toxins.txt"
    if not all_toxins.exists():
        return {"ok": False, "stage": "digger", "error": f"Missing All_Toxins.txt at {all_toxins}"}

    # 2) Run Shotter scoring via pixi run -e pipeline
    shotter_dir.mkdir(parents=True, exist_ok=True)
    scripts_dir = Path(__file__).resolve().parents[0]
    pixi_project_dir = Path(__file__).resolve().parents[1]
    
    shoter_cmd = build_shotter_command(
        pixi_project_dir=pixi_project_dir,
        script_path=scripts_dir / "bttoxin_shoter.py",
        toxicity_csv=toxicity_csv,
        all_toxins=all_toxins,
        output_dir=shotter_dir,
        min_identity=min_identity,
        min_coverage=min_coverage,
        allow_unknown_families=allow_unknown_families,
        require_index_hit=require_index_hit,
    )

    r1 = _shell(shoter_cmd)
    if r1.returncode != 0:
        return {"ok": False, "stage": "shotter", "error": f"Shotter failed: {' '.join(shoter_cmd)}"}

    strain_scores = shotter_dir / "strain_target_scores.tsv"
    toxin_support = shotter_dir / "toxin_support.tsv"
    species_scores = shotter_dir / "strain_target_species_scores.tsv"

    # 3) Plot & report via pixi run -e pipeline
    strain_for_plot = _read_first_strain(strain_scores)
    plot_cmd = build_plot_command(
        pixi_project_dir=pixi_project_dir,
        script_path=scripts_dir / "plot_shotter.py",
        strain_scores=strain_scores,
        toxin_support=toxin_support,
        species_scores=species_scores,
        out_dir=shotter_dir,
        merge_unresolved=True,
        report_mode="paper",
        lang=lang,
        per_hit_strain=strain_for_plot if strain_for_plot else None,
    )

    r2 = _shell(plot_cmd)
    if r2.returncode != 0:
        # plotting/report optional; continue
        pass

    # 4) Bundle
    bundle = out_root / "pipeline_results.tar.gz"
    with tarfile.open(bundle, "w:gz") as tar:
        tar.add(digger_dir, arcname="digger")
        tar.add(shotter_dir, arcname="shotter")

    return {
        "ok": True,
        "digger_dir": str(digger_dir),
        "shotter_dir": str(shotter_dir),
        "bundle": str(bundle),
        "all_toxins": str(all_toxins),
        "strain": strain_for_plot,
    }


def main() -> int:
    ap = argparse.ArgumentParser(description="Run single-fna Digger -> Shotter pipeline (pixi-based)")
    ap.add_argument("--fna", type=Path, required=True, help="Path to a single .fna file")
    ap.add_argument("--toxicity_csv", type=Path, default=Path("Data/toxicity-data.csv"))
    ap.add_argument("--out_root", type=Path, default=Path("runs/single_run"))
    ap.add_argument("--min_identity", type=float, default=0.0)
    ap.add_argument("--min_coverage", type=float, default=0.0)
    ap.add_argument("--disallow_unknown_families", action="store_true", default=False)
    ap.add_argument("--require_index_hit", action="store_true", default=False)
    ap.add_argument("--lang", type=str, choices=["zh", "en"], default="zh")
    ap.add_argument("--bttoxin_db_dir", type=Path, default=None,
                    help="外部 bt_toxin 数据库目录路径（默认自动检测 external_dbs/bt_toxin）")
    ap.add_argument("--threads", type=int, default=4, help="线程数")
    args = ap.parse_args()

    # derive per-run default out_root using file stem
    if str(args.out_root) == "runs/single_run":
        stem = args.fna.stem
        args.out_root = Path("runs") / f"{stem}_run"

    res = run_single_fna_pipeline(
        fna_path=args.fna,
        out_root=args.out_root,
        toxicity_csv=args.toxicity_csv,
        min_identity=args.min_identity,
        min_coverage=args.min_coverage,
        allow_unknown_families=not args.disallow_unknown_families,
        require_index_hit=args.require_index_hit,
        lang=args.lang,
        bttoxin_db_dir=args.bttoxin_db_dir,
        threads=args.threads,
    )

    if not res.get("ok"):
        print(f"[pipeline] FAILED at stage={res.get('stage')}: {res.get('error')}")
        logs = res.get("logs")
        if logs:
            print(logs[:2000])
        return 1

    print("[pipeline] ✓ Done")
    print(f"  Digger: {res['digger_dir']}")
    print(f"  Shotter: {res['shotter_dir']}")
    print(f"  Bundle: {res['bundle']}")
    print(f"  Strain: {res.get('strain','')}")
    return 0


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