#!/usr/bin/env python
"""
Два пайплайна:
  1) MD → LaTeX  (этот модуль пишет project/)
  2) LaTeX → PDF (XeLaTeX; флаг --pdf или scripts/md2pdf.ps1)
"""

from __future__ import annotations

import argparse
import shutil
import subprocess
import sys
from pathlib import Path

from .converter import convert_md_to_latex_project


def _run_xelatex(project_dir: Path, passes: int = 2) -> int:
    main = project_dir / "main.tex"
    if not main.is_file():
        print(f"Error: {main} not found", file=sys.stderr)
        return 2

    xelatex = shutil.which("xelatex")
    latexmk = shutil.which("latexmk")

    if latexmk:
        cmd = [
            latexmk, "-xelatex", "-interaction=nonstopmode",
            "-halt-on-error", "main.tex",
        ]
        print("Pipeline 2 (LaTeX → PDF):", " ".join(cmd))
        r = subprocess.run(cmd, cwd=project_dir)
        return r.returncode

    if not xelatex:
        print(
            "Error: XeLaTeX not found (install MiKTeX/TeX Live and add to PATH).\n"
            "Pipeline 1 done — compile manually:\n"
            f"  cd {project_dir}\n"
            "  xelatex main.tex && xelatex main.tex",
            file=sys.stderr,
        )
        return 3

    for i in range(passes):
        cmd = [xelatex, "-interaction=nonstopmode", "-halt-on-error", "main.tex"]
        print(f"Pipeline 2 pass {i + 1}/{passes}:", " ".join(cmd))
        r = subprocess.run(cmd, cwd=project_dir)
        if r.returncode != 0:
            return r.returncode
    return 0


def main() -> None:
    p = argparse.ArgumentParser(
        prog="md2latex",
        description=(
            "Пайплайн 1: MD (диалект md2gost) → LaTeX-проект (шаблон МИРЭА). "
            "Пайплайн 2: XeLaTeX → PDF (опция --pdf)."
        ),
    )
    p.add_argument("filename", help="Исходный .md")
    p.add_argument(
        "-o", "--output-dir",
        default=None,
        help="Каталог LaTeX-проекта (по умолчанию: <stem>_latex рядом с md)",
    )
    p.add_argument("--titlepage", help="PDF титульного листа → titlepage.pdf")
    p.add_argument(
        "--pdf",
        action="store_true",
        help="Пайплайн 2: сразу собрать PDF через XeLaTeX/latexmk",
    )
    p.add_argument(
        "--xelatex-passes",
        type=int,
        default=2,
        help="Число проходов xelatex, если нет latexmk (по умолчанию 2)",
    )
    args = p.parse_args()

    md = Path(args.filename)
    if not md.suffix.lower() == ".md":
        print("Error: filename must be .md", file=sys.stderr)
        sys.exit(1)
    if not md.is_file():
        print(f"Error: file not found: {md}", file=sys.stderr)
        sys.exit(1)

    out = Path(args.output_dir) if args.output_dir else md.with_name(md.stem + "_latex")
    main_tex = convert_md_to_latex_project(md, out, titlepage=args.titlepage)
    print(f"Pipeline 1 (MD → LaTeX): {main_tex}")

    if args.pdf:
        code = _run_xelatex(out, passes=args.xelatex_passes)
        pdf = out / "main.pdf"
        if code == 0 and pdf.is_file():
            print(f"Pipeline 2 (LaTeX → PDF): {pdf.resolve()}")
        sys.exit(code)


if __name__ == "__main__":
    main()