import type {
	BestiaryIndexEntry,
	Creature,
	CreatureId,
} from "@initiative/domain";
import { useCallback, useEffect, useState } from "react";
import {
	normalizeBestiary,
	setSourceDisplayNames,
} from "../adapters/bestiary-adapter.js";
import * as bestiaryCache from "../adapters/bestiary-cache.js";
import {
	getSourceDisplayName,
	loadBestiaryIndex,
} from "../adapters/bestiary-index-adapter.js";

export interface SearchResult extends BestiaryIndexEntry {
	readonly sourceDisplayName: string;
}

interface BestiaryHook {
	search: (query: string) => SearchResult[];
	getCreature: (id: CreatureId) => Creature | undefined;
	isLoaded: boolean;
	isSourceCached: (sourceCode: string) => Promise<boolean>;
	fetchAndCacheSource: (sourceCode: string, url: string) => Promise<void>;
	uploadAndCacheSource: (
		sourceCode: string,
		jsonData: unknown,
	) => Promise<void>;
	refreshCache: () => Promise<void>;
}

export function useBestiary(): BestiaryHook {
	const [isLoaded, setIsLoaded] = useState(false);
	const [creatureMap, setCreatureMap] = useState(
		() => new Map<CreatureId, Creature>(),
	);

	useEffect(() => {
		const index = loadBestiaryIndex();
		setSourceDisplayNames(index.sources as Record<string, string>);
		if (index.creatures.length > 0) {
			setIsLoaded(true);
		}

		void bestiaryCache.loadAllCachedCreatures().then((map) => {
			setCreatureMap(map);
		});
	}, []);

	const search = useCallback((query: string): SearchResult[] => {
		if (query.length < 2) return [];
		const lower = query.toLowerCase();
		const index = loadBestiaryIndex();
		return index.creatures
			.filter((c) => c.name.toLowerCase().includes(lower))
			.sort((a, b) => a.name.localeCompare(b.name))
			.slice(0, 10)
			.map((c) => ({
				...c,
				sourceDisplayName: getSourceDisplayName(c.source),
			}));
	}, []);

	const getCreature = useCallback(
		(id: CreatureId): Creature | undefined => {
			return creatureMap.get(id);
		},
		[creatureMap],
	);

	const isSourceCachedFn = useCallback(
		(sourceCode: string): Promise<boolean> => {
			return bestiaryCache.isSourceCached(sourceCode);
		},
		[],
	);

	const fetchAndCacheSource = useCallback(
		async (sourceCode: string, url: string): Promise<void> => {
			const response = await fetch(url);
			if (!response.ok) {
				throw new Error(
					`Failed to fetch: ${response.status} ${response.statusText}`,
				);
			}
			const json = await response.json();
			const creatures = normalizeBestiary(json);
			const displayName = getSourceDisplayName(sourceCode);
			await bestiaryCache.cacheSource(sourceCode, displayName, creatures);
			setCreatureMap((prev) => {
				const next = new Map(prev);
				for (const c of creatures) {
					next.set(c.id, c);
				}
				return next;
			});
		},
		[],
	);

	const uploadAndCacheSource = useCallback(
		async (sourceCode: string, jsonData: unknown): Promise<void> => {
			// biome-ignore lint/suspicious/noExplicitAny: raw JSON shape varies
			const creatures = normalizeBestiary(jsonData as any);
			const displayName = getSourceDisplayName(sourceCode);
			await bestiaryCache.cacheSource(sourceCode, displayName, creatures);
			setCreatureMap((prev) => {
				const next = new Map(prev);
				for (const c of creatures) {
					next.set(c.id, c);
				}
				return next;
			});
		},
		[],
	);

	const refreshCache = useCallback(async (): Promise<void> => {
		const map = await bestiaryCache.loadAllCachedCreatures();
		setCreatureMap(map);
	}, []);

	return {
		search,
		getCreature,
		isLoaded,
		isSourceCached: isSourceCachedFn,
		fetchAndCacheSource,
		uploadAndCacheSource,
		refreshCache,
	};
}