"""项目路径解析与输入范围校验。"""

from __future__ import annotations

from datetime import datetime
from pathlib import Path
import uuid


PROJECT_ROOT = Path(__file__).resolve().parents[2]
TASKS_ROOT = PROJECT_ROOT / "data" / "skills-bench" / "tasks"
RESULTS_ROOT = PROJECT_ROOT / "results" / "compile-pipeline"


def task_directory(value: str) -> Path:
    requested = Path(value).expanduser()
    if requested.is_absolute():
        candidate = requested.resolve()
    elif len(requested.parts) == 1:
        candidate = (TASKS_ROOT / requested).resolve()
    else:
        candidate = (PROJECT_ROOT / requested).resolve()
    try:
        candidate.relative_to(TASKS_ROOT.resolve())
    except ValueError as exc:
        raise ValueError(f"--task must resolve below {TASKS_ROOT}") from exc
    if not (candidate / "task.md").is_file():
        raise ValueError(f"not a SkillsBench task directory: {candidate}")
    skills = candidate / "environment" / "skills"
    if not skills.is_dir():
        raise ValueError(f"SkillsBench task has no environment/skills directory: {candidate}")
    return candidate


def single_skill_source(task_dir: Path) -> Path:
    skills_root = task_dir / "environment" / "skills"
    skill_files = sorted(skills_root.rglob("SKILL.md"))
    if len(skill_files) != 1:
        raise ValueError(
            "the complete pipeline currently requires exactly one task Skill because "
            f"Fast and Deep accept one Skill package; found {len(skill_files)} under {skills_root}"
        )
    return skills_root


def requested_run_root(value: str | Path | None) -> Path:
    if value is None:
        run_id = datetime.now().strftime("%Y%m%d-%H%M%S") + "-" + uuid.uuid4().hex[:6]
        return (RESULTS_ROOT / run_id).resolve()
    requested = Path(value).expanduser()
    candidate = (
        requested.resolve()
        if requested.is_absolute()
        else (PROJECT_ROOT / requested).resolve()
    )
    try:
        candidate.relative_to(RESULTS_ROOT.resolve())
    except ValueError as exc:
        raise ValueError(f"--run-dir must resolve below {RESULTS_ROOT}") from exc
    return candidate