from __future__ import annotations

from pathlib import Path
from typing import Any

import yaml

from .model import Declaration

DECLARATION_DIRS = ("services", "capabilities", "interfaces", "dependencies", "bindings")


def repo_root() -> Path:
    return Path(__file__).resolve().parents[1]


def declaration_files(path: Path) -> list[Path]:
    path = path.resolve()
    if path.is_file():
        return [path]

    fabric = path if path.name == "fabric" else path / "fabric"
    files: list[Path] = []
    for directory in DECLARATION_DIRS:
        root = fabric / directory
        if root.is_dir():
            files.extend(sorted(root.glob("*.yaml")))
            files.extend(sorted(root.glob("*.yml")))
    return files


def load_yaml(path: Path) -> Any:
    return yaml.safe_load(path.read_text(encoding="utf-8"))


def load_declarations(paths: list[Path]) -> tuple[list[Declaration], list[tuple[Path, str]]]:
    declarations: list[Declaration] = []
    errors: list[tuple[Path, str]] = []
    seen_files: set[Path] = set()

    for raw in paths:
        for path in declaration_files(raw):
            if path in seen_files:
                continue
            seen_files.add(path)
            try:
                data = load_yaml(path)
            except Exception as exc:
                errors.append((path, str(exc)))
                continue
            if not isinstance(data, dict):
                errors.append((path, "declaration must be a YAML mapping"))
                continue
            declarations.append(Declaration(path=path, data=data))

    return declarations, errors