"""Define and initialize all durable filesystem paths.

Only this module decides where application data files live.
"""

from dataclasses import dataclass
from pathlib import Path


@dataclass(frozen=True)
class Paths:
    """Concrete files rooted below the configured data directory."""

    root: Path

    def __init__(self, root: str | Path) -> None:
        object.__setattr__(self, "root", Path(root))

    @property
    def config(self) -> Path:
        return self.root / "config.json"

    @property
    def entries(self) -> Path:
        return self.root / "entries.jsonl"

    @property
    def daily(self) -> Path:
        return self.root / "daily.jsonl"

    @property
    def traces(self) -> Path:
        return self.root / "traces.jsonl"

    @property
    def coach_brief(self) -> Path:
        return self.root / "coach_brief.md"

    @property
    def schedule_dir(self) -> Path:
        return self.root / "schedule"

    @property
    def schedule_priors(self) -> Path:
        return self.schedule_dir / "priors.json"

    @property
    def schedule_feedback(self) -> Path:
        return self.schedule_dir / "feedback.jsonl"

    @property
    def schedule_meta(self) -> Path:
        return self.schedule_dir / "meta.json"

    def plan_path(self, day: str) -> Path:
        """Return the JSON path for one calendar day's plan."""

        return self.schedule_dir / f"plan-{day}.json"

    def ensure(self) -> None:
        """Create the data directory and initial empty JSONL files."""

        self.root.mkdir(parents=True, exist_ok=True)
        self.schedule_dir.mkdir(parents=True, exist_ok=True)
        for path in (self.entries, self.daily, self.traces, self.schedule_feedback):
            path.touch(exist_ok=True)