from __future__ import annotations

import argparse
import json
from pathlib import Path
from typing import Iterable

CONFIG_NAME = "release_config.json"
DEFAULT_MANIFEST_EXCLUDE_DIRS = {
    ".cache",
    ".git",
    ".ipynb_checkpoints",
    ".pytest_cache",
    "__pycache__",
    "essd",
    "essd_scripts",
    "eval_events",
    "eval_picks",
    "eval_snr",
    "figures",
    "notebooks",
    "paired_eval_all",
    "paired_eval_full_pnsn_v3_diff",
    "paired_eval_mini",
    "paired_eval_mini_station_windows",
    "publish_mini",
    "temp",
}
DEFAULT_MANIFEST_EXCLUDE_NAMES = {
    ".DS_Store",
    "manifest_filesizes.tsv",
    "manifest_sha256.txt",
}
DEFAULT_MANIFEST_EXCLUDE_PREFIXES = (
    "._",
    "overleaf-",
    "paired_eval",
)
DEFAULT_MANIFEST_EXCLUDE_SUFFIXES = {
    ".aux",
    ".doc",
    ".docx",
    ".log",
    ".out",
    ".pdf",
    ".pyc",
    ".tex",
    ".zip",
}


def find_release_root(start: str | Path | None = None) -> Path:
    current = Path(start or Path.cwd()).resolve()
    if current.is_file():
        current = current.parent
    for path in (current, *current.parents):
        if (path / CONFIG_NAME).is_file():
            return path
    raise FileNotFoundError(f"Could not find {CONFIG_NAME} from {current}")


def load_config(config_path: str | Path | None = None) -> tuple[Path, dict]:
    if config_path is None:
        root = find_release_root()
        path = root / CONFIG_NAME
    else:
        path = Path(config_path).resolve()
        root = path.parent
    with path.open("r", encoding="utf-8") as f:
        config = json.load(f)
    return root, config


def manifest_paths(root: Path, config: dict, *, code_only: bool = False) -> list[str]:
    manifest = config.get("upload_manifest", "upload_manifest.txt")
    selected: list[str] = []
    if code_only:
        prefixes = tuple(config.get("code_prefixes", ["scripts/", "utils/"]))
        selected.extend(
            rel
            for p in root.rglob("*")
            if p.is_file()
            for rel in [p.relative_to(root).as_posix()]
            if rel.startswith(prefixes) and should_include_in_upload_manifest(p, root, config)
        )
        selected.extend([CONFIG_NAME, manifest])
        return sorted(dict.fromkeys(selected))

    manifest_path = root / manifest
    if not manifest_path.is_file():
        raise FileNotFoundError(f"Manifest not found: {manifest_path}")
    for raw in manifest_path.read_text(encoding="utf-8").splitlines():
        line = raw.strip()
        if not line or line.startswith("#"):
            continue
        selected.append(line)
    return sorted(dict.fromkeys(selected))


def should_include_in_upload_manifest(path: Path, root: Path, config: dict) -> bool:
    rel = path.relative_to(root)
    parts = rel.parts
    name = path.name
    exclude_dirs = set(DEFAULT_MANIFEST_EXCLUDE_DIRS)
    exclude_dirs.update(config.get("manifest_exclude_dirs", []))
    exclude_names = set(DEFAULT_MANIFEST_EXCLUDE_NAMES)
    exclude_names.update(config.get("manifest_exclude_names", []))
    exclude_prefixes = tuple(DEFAULT_MANIFEST_EXCLUDE_PREFIXES) + tuple(
        config.get("manifest_exclude_prefixes", [])
    )
    exclude_suffixes = set(DEFAULT_MANIFEST_EXCLUDE_SUFFIXES)
    exclude_suffixes.update(config.get("manifest_exclude_suffixes", []))

    if any(part in exclude_dirs for part in parts):
        return False
    if parts and parts[0].startswith(exclude_prefixes):
        return False
    if name in exclude_names or name.startswith(exclude_prefixes):
        return False
    if path.suffix in exclude_suffixes:
        return False
    return True


def build_upload_manifest(root: Path, config: dict) -> list[str]:
    selected = []
    for path in root.rglob("*"):
        if path.is_file() and should_include_in_upload_manifest(path, root, config):
            selected.append(path.relative_to(root).as_posix())
    return sorted(dict.fromkeys(selected))


def existing_files(root: Path, paths: Iterable[str]) -> list[tuple[str, Path]]:
    out: list[tuple[str, Path]] = []
    missing: list[str] = []
    for rel in paths:
        path = root / rel
        if path.is_file():
            out.append((rel, path))
        else:
            missing.append(rel)
    if missing:
        raise FileNotFoundError("Missing manifest files:\n" + "\n".join(missing))
    return out


def parser(description: str) -> argparse.ArgumentParser:
    p = argparse.ArgumentParser(description=description)
    p.add_argument("--config", default=None, help="Path to release_config.json")
    p.add_argument("--repo-id", default=None, help="Override destination repo id")
    p.add_argument("--dry-run", action="store_true", help="Print files without uploading")
    p.add_argument("--code-only", action="store_true", help="Upload only scripts, utils, config, and manifest")
    return p


def main() -> None:
    p = argparse.ArgumentParser(description="Build the canonical release upload manifest")
    p.add_argument("--config", default=None, help="Path to release_config.json")
    p.add_argument("--write", action="store_true", help="Write upload_manifest.txt instead of printing paths")
    args = p.parse_args()
    root, config = load_config(args.config)
    paths = build_upload_manifest(root, config)
    if args.write:
        manifest = root / config.get("upload_manifest", "upload_manifest.txt")
        manifest.write_text("\n".join(paths) + "\n", encoding="utf-8")
        print(f"wrote {manifest} ({len(paths)} files)")
    else:
        print("\n".join(paths))


if __name__ == "__main__":
    main()