import { type ReactNode } from "react";
import { authApiClient } from "../lib/api-client";
import { SettingsContext, type AppSettings } from "./settings-context";
import { useQuery } from "@tanstack/react-query";
import { useAuth } from "./auth-context";

// --- Case Conversion Utility ---
// This is added here to simplify the fix and avoid module resolution issues.
function snakeToCamel(str: string): string {
	return str.replace(/(_\w)/g, (m) => m[1].toUpperCase());
}

function convertKeysToCamelCase(obj: unknown): unknown {
	if (Array.isArray(obj)) {
		return obj.map((v) => convertKeysToCamelCase(v));
	}
	if (typeof obj === "object" && obj !== null) {
		return Object.keys(obj).reduce((acc: Record<string, unknown>, key: string) => {
			const camelKey = snakeToCamel(key);
			acc[camelKey] = convertKeysToCamelCase((obj as Record<string, unknown>)[key]);
			return acc;
		}, {});
	}
	return obj;
}

// Redefine AppSettings to match the flat structure of the API response
export type FlatAppSettings = {
	service: "spotify" | "deezer";
	spotify: string;
	spotifyQuality: "NORMAL" | "HIGH" | "VERY_HIGH";
	deezer: string;
	deezerQuality: "MP3_128" | "MP3_320" | "FLAC";
	maxConcurrentDownloads: number;
	utilityConcurrency: number;
	realTime: boolean;
	fallback: boolean;
	convertTo: "MP3" | "AAC" | "OGG" | "OPUS" | "FLAC" | "WAV" | "ALAC" | "";
	bitrate: string;
	maxRetries: number;
	retryDelaySeconds: number;
	retryDelayIncrease: number;
	customDirFormat: string;
	customTrackFormat: string;
	tracknumPadding: boolean;
	saveCover: boolean;
	explicitFilter: boolean;
	// Add other fields from the old AppSettings as needed by other parts of the app
	watch: AppSettings["watch"];
	// Add defaults for the new download properties
	threads: number;
	path: string;
	skipExisting: boolean;
	m3u: boolean;
	hlsThreads: number;
	// Frontend-only flag used in DownloadsTab
	recursiveQuality: boolean;
	separateTracksByUser: boolean;
	// Add defaults for the new formatting properties
	track: string;
	album: string;
	playlist: string;
	compilation: string;
	artistSeparator: string;
	spotifyMetadata: boolean;
	realTimeMultiplier: number;
};

const defaultSettings: FlatAppSettings = {
	service: "spotify",
	spotify: "",
	spotifyQuality: "NORMAL",
	deezer: "",
	deezerQuality: "MP3_128",
	maxConcurrentDownloads: 3,
	utilityConcurrency: 1,
	realTime: false,
	fallback: false,
	convertTo: "",
	bitrate: "",
	maxRetries: 3,
	retryDelaySeconds: 5,
	retryDelayIncrease: 5,
	customDirFormat: "%ar_album%/%album%",
	customTrackFormat: "%tracknum%. %music%",
	tracknumPadding: true,
	saveCover: true,
	explicitFilter: false,
	// Add defaults for the new download properties
	threads: 4,
	path: "/downloads",
	skipExisting: true,
	m3u: false,
	hlsThreads: 8,
	// Frontend-only default
	recursiveQuality: false,
	separateTracksByUser: false,
	// Add defaults for the new formatting properties
	track: "{artist_name}/{album_name}/{track_number} - {track_name}",
	album: "{artist_name}/{album_name}",
	playlist: "Playlists/{playlist_name}",
	compilation: "Compilations/{album_name}",
	artistSeparator: "; ",
	spotifyMetadata: true,
	watch: {
		enabled: false,
		maxItemsPerRun: 50,
		watchPollIntervalSeconds: 3600,
		watchedArtistAlbumGroup: ["album", "single"],
	},
	realTimeMultiplier: 0,
};

interface FetchedCamelCaseSettings {
	watchEnabled?: boolean;
	watch?: { enabled: boolean; maxItemsPerRun?: number; watchPollIntervalSeconds?: number; watchedArtistAlbumGroup?: string[] };
	[key: string]: unknown;
}

const fetchSettings = async (): Promise<FlatAppSettings> => {
	try {
		const [{ data: generalConfig }, { data: watchConfig }] = await Promise.all([
			authApiClient.client.get("/config"),
			authApiClient.client.get("/config/watch"),
		]);

		const combinedConfig = {
			...generalConfig,
			watch: watchConfig,
		};

		// Transform the keys before returning the data
		const camelData = convertKeysToCamelCase(combinedConfig) as FetchedCamelCaseSettings;

		const withDefaults: FlatAppSettings = {
			...(camelData as unknown as FlatAppSettings),
			// Ensure required frontend-only fields exist
			recursiveQuality: Boolean((camelData as any).recursiveQuality ?? false),
			realTimeMultiplier: Number((camelData as any).realTimeMultiplier ?? 0),
			utilityConcurrency: Number((camelData as any).utilityConcurrency ?? 1),
			// Ensure watch subkeys default if missing
			watch: {
				...(camelData.watch as any),
				enabled: Boolean((camelData.watch as any)?.enabled ?? false),
				maxItemsPerRun: Number((camelData.watch as any)?.maxItemsPerRun ?? 50),
				watchPollIntervalSeconds: Number((camelData.watch as any)?.watchPollIntervalSeconds ?? 3600),
				watchedArtistAlbumGroup: (camelData.watch as any)?.watchedArtistAlbumGroup ?? ["album", "single"],
			},
		};

		return withDefaults;
	} catch (error: any) {
		// If we get authentication errors, return default settings
		if (error.response?.status === 401 || error.response?.status === 403) {
			console.log("Authentication required for config access, using default settings");
			return defaultSettings;
		}
		// Re-throw other errors for React Query to handle
		throw error;
	}
};

export function SettingsProvider({ children }: { children: ReactNode }) {
	const { isLoading, authEnabled, isAuthenticated, user } = useAuth();
	
	// Only fetch settings when auth is ready and user is admin (or auth is disabled)
	const shouldFetchSettings = !isLoading && (!authEnabled || (isAuthenticated && user?.role === "admin"));
	
	const {
		data: settings,
		isLoading: isSettingsLoading,
		isError,
	} = useQuery({
		queryKey: ["config"],
		queryFn: fetchSettings,
		staleTime: 1000 * 60 * 5, // 5 minutes
		refetchOnWindowFocus: false,
		enabled: shouldFetchSettings, // Only run query when auth is ready and user is admin
	});

	// Use default settings on error to prevent app crash
	const value = { settings: isError ? defaultSettings : settings || null, isLoading: isSettingsLoading };

	return <SettingsContext.Provider value={value}>{children}</SettingsContext.Provider>;
}