"""
LRU Bicep module catalog — loaded from the bundled catalog file at startup.

The catalog (bicep_modules_catalog.json) is baked into the Docker image at build time.
No runtime dependency on DevOpsMCP or any external service.

Provides completion items for LRU-internal Bicep modules with
higher sort priority than standard Azure modules.
"""

import json
import logging
import pathlib
from typing import Any

logger = logging.getLogger(__name__)

# Catalog is baked into the image root at /bicep_modules_catalog.json
_CATALOG_PATHS = [
    pathlib.Path("/bicep_modules_catalog.json"),
    pathlib.Path(__file__).parent.parent.parent / "bicep_modules_catalog.json",
]


def _load_catalog() -> list[dict[str, Any]]:
    """Load modules from the bundled catalog file."""
    for path in _CATALOG_PATHS:
        if path.exists():
            try:
                data = json.loads(path.read_text())
                modules_raw = data.get("modules", {})
                registry = data.get("registry", "iactemplatereg.azurecr.io")
                modules = []
                # modules is a dict: { "bicep/modules/appservice": { versions: [...], ... }, ... }
                for mod_path, info in modules_raw.items():
                    versions = info.get("versions", ["latest"])
                    name = mod_path.split("/")[-1] if "/" in mod_path else mod_path
                    modules.append({
                        "name": name,
                        "path": mod_path,
                        "versions": versions,
                        "latest": versions[-1] if versions else "latest",
                        "registry": registry,
                    })
                logger.info("Bicep catalog loaded from %s: %d modules", path, len(modules))
                return modules
            except Exception:
                logger.exception("Failed to parse catalog at %s", path)
    logger.warning("No bicep_modules_catalog.json found — completions disabled")
    return []


class BicepModuleCatalog:
    """In-memory catalog of LRU Bicep modules, loaded once at startup."""

    _modules: list[dict[str, Any]] = []

    @classmethod
    def load(cls) -> None:
        """Load catalog from disk. Call once at startup."""
        cls._modules = _load_catalog()

    @classmethod
    def get_modules(cls) -> list[dict[str, Any]]:
        return cls._modules

    @classmethod
    def as_completion_items(cls) -> list[dict[str, Any]]:
        items = []
        for mod in cls._modules:
            ref = f"br/modules:{mod['path']}:{mod['latest']}"
            items.append({
                "label": mod["name"],
                "kind": 9,  # Module
                "detail": f"LRU Bicep module — {mod['registry']}",
                "insertText": ref,
                "sortText": f"0_lru_{mod['name']}",
                "documentation": {
                    "kind": "markdown",
                    "value": (
                        f"**{mod['name']}** (LRU internal)\n\n"
                        f"Registry: `{mod['registry']}`\n"
                        f"Versions: {', '.join(mod['versions'])}\n\n"
                        f"```bicep\nmodule {mod['name'].lower()} '{ref}' = {{\n"
                        f"  name: '{mod['name'].lower()}'\n  params: {{}}\n}}\n```"
                    ),
                },
            })
        return items