import os
import json
from fastapi import APIRouter

router = APIRouter(prefix="/version", tags=["版本信息"])


@router.get("")
async def get_version():
    """Return platform version information for display on login/dashboard"""
    # Read VERSIONS.json from project root (2 levels up from backend/)
    backend_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))

    # Try multiple paths for VERSIONS.json
    for path in [
        os.path.join(backend_dir, "VERSIONS.json"),            # standalone
        os.path.join(backend_dir, "..", "VERSIONS.json"),       # inside core/ subtree
        os.path.join(backend_dir, "..", "..", "VERSIONS.json"), # customer project root
    ]:
        if os.path.exists(path):
            with open(path, 'r', encoding='utf-8') as f:
                versions = json.load(f)
            return versions

    # Fallback: read VERSION file
    version_file = os.path.join(backend_dir, "VERSION")
    version = "unknown"
    if os.path.exists(version_file):
        with open(version_file, 'r') as f:
            version = f.read().strip()

    return {"project_version": version, "project": "ems-core"}