from __future__ import annotations

import json
import os
import urllib.parse
from datetime import datetime, timezone
from pathlib import Path
from typing import Any

from .core import BotRuntime
from .db import load_document, save_document


def load_state(path: Path) -> dict[str, Any]:
    data = load_document(path)
    if data is None:
        return {}
    return data if isinstance(data, dict) else {}


def save_state(path: Path, state: dict[str, Any]) -> None:
    save_document(path, state)


def validate_channel_id(value: str, label: str) -> str:
    channel_id = value.strip()
    if not channel_id:
        raise ValueError(f"{label} channel ID is required")
    if not channel_id.isdigit():
        raise ValueError(f"{label} channel ID must be a Discord numeric channel ID")
    return channel_id


def channel_settings(runtime: BotRuntime) -> dict[str, str]:
    data = load_state(runtime.settings_path)
    status_channel = str(data.get("status_channel_id", "")).strip() or runtime.default_channel_id
    media_channel = str(data.get("media_channel_id", "")).strip() or status_channel
    catalog_url = str(data.get("catalog_url", "")).strip() or os.getenv("PUBLIC_CATALOG_URL", "").strip()
    return {
        "statusChannelId": status_channel,
        "mediaChannelId": media_channel,
        "catalogUrl": catalog_url,
    }


def validate_catalog_url(value: str) -> str:
    catalog_url = value.strip()
    if not catalog_url:
        return ""
    parsed = urllib.parse.urlparse(catalog_url)
    if parsed.scheme not in {"http", "https"} or not parsed.netloc:
        raise ValueError("Catalog URL must be a valid http(s) URL")
    return catalog_url


def save_channel_settings(
    runtime: BotRuntime,
    status_channel_id: str,
    media_channel_id: str,
    catalog_url: str = "",
) -> dict[str, str]:
    status_channel = validate_channel_id(status_channel_id, "Status")
    media_channel = validate_channel_id(media_channel_id or status_channel, "Media")
    state = load_state(runtime.settings_path)
    state.update(
        {
            "status_channel_id": status_channel,
            "media_channel_id": media_channel,
            "catalog_url": validate_catalog_url(catalog_url),
            "updated_at": datetime.now(timezone.utc).isoformat(),
        }
    )
    save_state(runtime.settings_path, state)
    return channel_settings(runtime)


def save_media_channel_setting(runtime: BotRuntime, media_channel_id: str) -> dict[str, str]:
    media_channel = validate_channel_id(media_channel_id, "Media")
    state = load_state(runtime.settings_path)
    state["media_channel_id"] = media_channel
    state["updated_at"] = datetime.now(timezone.utc).isoformat()
    save_state(runtime.settings_path, state)
    return channel_settings(runtime)


def jellyfin_settings(runtime: BotRuntime) -> dict[str, Any]:
    data = load_state(runtime.settings_path)
    api_key = str(data.get("jellyfin_api_key", "")).strip()
    library_names = data.get("jellyfin_library_names", [])
    if not isinstance(library_names, list):
        library_names = []
    return {
        "url": str(data.get("jellyfin_url", "")).strip(),
        "configured": bool(api_key),
        "libraryNames": [str(name) for name in library_names if str(name).strip()],
        "autoSync": bool(data.get("jellyfin_auto_sync", False)),
        "lastSyncAt": data.get("jellyfin_last_sync_at"),
        "lastSyncError": data.get("jellyfin_last_sync_error"),
        "lastPublishedAt": data.get("jellyfin_last_published_at"),
        "lastFingerprint": data.get("jellyfin_last_fingerprint"),
        "lastPublishedFingerprint": data.get("jellyfin_last_published_fingerprint"),
        "lastChanges": data.get("jellyfin_last_changes"),
    }


def save_jellyfin_settings(runtime: BotRuntime, data: dict[str, Any]) -> dict[str, Any]:
    state = load_state(runtime.settings_path)
    url = str(data.get("url", "")).strip().rstrip("/")
    if url:
        parsed = urllib.parse.urlparse(url)
        if parsed.scheme not in {"http", "https"} or not parsed.netloc:
            raise ValueError("Jellyfin URL must be a valid http(s) URL")

    api_key = str(data.get("apiKey", "")).strip()
    state["jellyfin_url"] = url
    if api_key:
        state["jellyfin_api_key"] = api_key
    elif data.get("clearApiKey"):
        state["jellyfin_api_key"] = ""
    raw_library_names = data.get("libraryNames", [])
    if isinstance(raw_library_names, str):
        library_names = [name.strip() for name in raw_library_names.split(",") if name.strip()]
    elif isinstance(raw_library_names, list):
        library_names = [str(name).strip() for name in raw_library_names if str(name).strip()]
    else:
        raise ValueError("Jellyfin libraries must be a list or comma-separated string")
    state["jellyfin_library_names"] = library_names
    state["jellyfin_auto_sync"] = bool(data.get("autoSync", False))
    state["updated_at"] = datetime.now(timezone.utc).isoformat()
    save_state(runtime.settings_path, state)
    return jellyfin_settings(runtime)


def save_catalog_url_setting(runtime: BotRuntime, catalog_url: str) -> dict[str, str]:
    state = load_state(runtime.settings_path)
    state["catalog_url"] = validate_catalog_url(catalog_url)
    state["updated_at"] = datetime.now(timezone.utc).isoformat()
    save_state(runtime.settings_path, state)
    return channel_settings(runtime)