from __future__ import annotations

import re
from dataclasses import dataclass
from datetime import datetime
from pathlib import Path


class WorkspaceNotFoundError(FileNotFoundError):
    pass


class WorkspaceValidationError(ValueError):
    def __init__(self, root: Path, missing: list[str]) -> None:
        self.root = root
        self.missing = missing
        super().__init__(
            f"Invalid evaluation workspace {root}: missing {', '.join(missing)}"
        )


@dataclass(frozen=True, slots=True)
class EvaluationWorkspace:
    root: Path
    repository: Path | None = None

    def __post_init__(self) -> None:
        object.__setattr__(self, "root", Path(self.root).expanduser().resolve())
        if self.repository is not None:
            object.__setattr__(
                self, "repository", Path(self.repository).expanduser().resolve()
            )

    @classmethod
    def discover(
        cls,
        target: str | Path,
        *,
        repository: str | Path | None = None,
    ) -> EvaluationWorkspace:
        candidate = Path(target).expanduser().resolve()
        if candidate.is_file():
            candidate = candidate.parent
        repository_path = Path(repository).expanduser().resolve() if repository else None

        for directory in (candidate, *candidate.parents):
            if cls.looks_like_evaluation(directory):
                return cls(directory, repository_path)
            if repository_path is not None and directory == repository_path:
                break
        raise WorkspaceNotFoundError(
            f"Could not find an evaluation workspace from: {target}"
        )

    @staticmethod
    def looks_like_evaluation(path: Path) -> bool:
        markers = (
            "enonce.pdf",
            "enonce.tex",
            "labels",
            "Copies",
            "correction.json",
            ".copienator",
            ".copienator-gui.json",
        )
        return path.is_dir() and any((path / marker).exists() for marker in markers)

    @property
    def name(self) -> str:
        return self.root.name

    @property
    def metadata_dir(self) -> Path:
        return self.root / ".copienator"

    @property
    def logs_dir(self) -> Path:
        return self.metadata_dir / "logs"

    @property
    def runs_dir(self) -> Path:
        return self.metadata_dir / "runs"

    @property
    def state_database(self) -> Path:
        return self.metadata_dir / "state.sqlite3"

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

    @property
    def labels_file(self) -> Path:
        return self.root / "labels"

    @property
    def label_groups_file(self) -> Path:
        return self.root / "label_groups"

    @property
    def gemini_exam_items_file(self) -> Path:
        return self.root / "Tmp" / "exam_items.txt"

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

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

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

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

    @property
    def manual_resolutions_file(self) -> Path:
        return self.root / "manual_resolutions.txt"

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

    @property
    def copies_dir(self) -> Path:
        return self.root / "Copies"

    @property
    def original_copies_dir(self) -> Path:
        return self.root / "Copies Originales"

    @property
    def cutleft_dir(self) -> Path:
        return self.root / "Cutleft"

    @property
    def groups_dir(self) -> Path:
        return self.root / "Par label"

    @property
    def text_dir(self) -> Path:
        return self.root / "Text"

    @property
    def solution_dir(self) -> Path:
        return self.root / "Sol"

    @property
    def rendered_text_dir(self) -> Path:
        return self.root / "Text2"

    @property
    def rendered_solution_dir(self) -> Path:
        return self.root / "Sol2"

    @property
    def rubric_dir(self) -> Path:
        return self.root / "Persp"

    @property
    def return_dir(self) -> Path:
        return self.root / "A Rendre"

    def annotation_dir(self, mode: str) -> Path:
        directories = {
            "simple": "Anot",
            "checks": "Bnot",
            "grouped": "BGnot",
            "refaire": "BRnot",
        }
        try:
            return self.root / directories[mode]
        except KeyError as exc:
            choices = ", ".join(directories)
            raise ValueError(
                f"Unknown annotation mode {mode!r}; expected one of: {choices}"
            ) from exc

    def names_file(self) -> Path:
        local = self.root / "names"
        if local.exists() or self.repository is None:
            return local
        return self.repository / "names"

    def read_labels(self) -> list[str]:
        return [
            line.strip()
            for line in self.labels_file.read_text(encoding="utf-8").splitlines()
            if line.strip()
        ]

    def require(self, *relative_paths: str) -> None:
        missing = [
            relative_path
            for relative_path in relative_paths
            if not (self.root / relative_path).exists()
        ]
        if missing:
            raise WorkspaceValidationError(self.root, missing)

    def require_files(self, *relative_paths: str) -> None:
        missing = [
            relative_path
            for relative_path in relative_paths
            if not (self.root / relative_path).is_file()
        ]
        if missing:
            raise WorkspaceValidationError(self.root, missing)

    def require_directories(self, *relative_paths: str) -> None:
        missing = [
            relative_path
            for relative_path in relative_paths
            if not (self.root / relative_path).is_dir()
        ]
        if missing:
            raise WorkspaceValidationError(self.root, missing)

    def ensure_control_directories(self) -> None:
        self.logs_dir.mkdir(parents=True, exist_ok=True)
        self.runs_dir.mkdir(parents=True, exist_ok=True)

    def command_argument(self) -> str:
        if self.repository is not None:
            try:
                return str(self.root.relative_to(self.repository))
            except ValueError:
                pass
        return str(self.root)

    def log_path(self, step_id: str, when: datetime | None = None) -> Path:
        timestamp = (when or datetime.now().astimezone()).strftime("%Y%m%d-%H%M%S")
        safe_step = re.sub(r"[^A-Za-z0-9_.-]+", "_", step_id)
        return self.logs_dir / f"{timestamp}-{safe_step}.log"