import type { Did, Nsid } from "@atcute/lexicons/syntax";
import type { OAuthUserAgent } from "@atcute/oauth-browser-client";
import { ClientResponseError, type BobbinContext } from "$lib/api/client";
import { jsonGet } from "$lib/api/_request";
import { httpStatusFor } from "$lib/api/load";
import { didFromUri, rkeyFromUri } from "$lib/api/uri";
import { createRecord, deleteRecord, putRecord } from "$lib/api/write";
import type { VouchRecord } from "$lib/api/records";
import type * as ShTangledFeedGetStar from "$lib/api/lexicons/types/sh/tangled/feed/getStar";
import type * as ShTangledGraphFollow from "$lib/api/lexicons/types/sh/tangled/graph/follow";
import type * as ShTangledGraphGetFollow from "$lib/api/lexicons/types/sh/tangled/graph/getFollow";
import type * as ShTangledGraphListNetworkVouches from "$lib/api/lexicons/types/sh/tangled/graph/listNetworkVouches";

export type FollowRecord = ShTangledGraphFollow.Main;
export type { VouchRecord };

const FOLLOW_COLLECTION = "sh.tangled.graph.follow" as Nsid;
const STAR_COLLECTION = "sh.tangled.feed.star" as Nsid;
const VOUCH_COLLECTION = "sh.tangled.graph.vouch" as Nsid;
export const getFollowRkey = async (
	ctx: BobbinContext,
	actor: string,
	subject: string
): Promise<string | null> => {
	try {
		const { uri } = await jsonGet<ShTangledGraphGetFollow.$output>(
			ctx,
			"sh.tangled.graph.getFollow",
			{
				actor: actor as Did,
				subject: subject as Did
			} satisfies ShTangledGraphGetFollow.$params
		);
		return rkeyFromUri(uri);
	} catch (cause) {
		if (cause instanceof ClientResponseError && httpStatusFor(cause) === 404) return null;
		throw cause;
	}
};

// 404 means no star exists, other errors propagate
export const getStarRkey = async (
	ctx: BobbinContext,
	actor: string,
	subject: string
): Promise<string | null> => {
	try {
		const { uri } = await jsonGet<ShTangledFeedGetStar.$output>(
			ctx,
			"sh.tangled.feed.getStar",
			{
				actor: actor as Did,
				subject
			} satisfies ShTangledFeedGetStar.$params
		);
		return rkeyFromUri(uri);
	} catch (cause) {
		if (cause instanceof ClientResponseError && httpStatusFor(cause) === 404) return null;
		throw cause;
	}
};

export const createFollow = async (agent: OAuthUserAgent, subject: string): Promise<string> => {
	const { uri } = await createRecord(agent, FOLLOW_COLLECTION, {
		$type: "sh.tangled.graph.follow",
		subject: subject as Did,
		createdAt: new Date().toISOString()
	});
	return rkeyFromUri(uri);
};

export const deleteFollow = async (agent: OAuthUserAgent, rkey: string): Promise<void> => {
	await deleteRecord(agent, FOLLOW_COLLECTION, rkey);
};

export const createStar = async (agent: OAuthUserAgent, repoDid: string): Promise<string> => {
	const { uri } = await createRecord(agent, STAR_COLLECTION, {
		$type: "sh.tangled.feed.star",
		subject: {
			$type: "sh.tangled.feed.star#repo",
			did: repoDid as Did
		},
		createdAt: new Date().toISOString()
	});
	return rkeyFromUri(uri);
};

export const deleteStar = async (agent: OAuthUserAgent, rkey: string): Promise<void> => {
	await deleteRecord(agent, STAR_COLLECTION, rkey);
};
const SUBSCRIPTION_COLLECTION = "org.tangled.feed.subscription" as Nsid;

export const createSubscription = async (
	agent: OAuthUserAgent,
	repoDid: string
): Promise<string> => {
	const { uri } = await createRecord(agent, SUBSCRIPTION_COLLECTION, {
		$type: SUBSCRIPTION_COLLECTION,
		subject: {
			$type: "org.tangled.feed.subscription#repo",
			did: repoDid as Did
		},
		createdAt: new Date().toISOString()
	});
	return rkeyFromUri(uri);
};

export const deleteSubscription = async (agent: OAuthUserAgent, rkey: string): Promise<void> => {
	await deleteRecord(agent, SUBSCRIPTION_COLLECTION, rkey);
};

export const createEntitySubscription = async (
	agent: OAuthUserAgent,
	entityUri: string
): Promise<string> => {
	const { uri } = await createRecord(agent, SUBSCRIPTION_COLLECTION, {
		$type: SUBSCRIPTION_COLLECTION,
		subject: {
			$type: "org.tangled.feed.subscription#uri",
			uri: entityUri
		},
		createdAt: new Date().toISOString()
	});
	return rkeyFromUri(uri);
};

// 404 means no subscription exists, other errors propagate.
export const getSubscriptionRkey = async (
	ctx: BobbinContext,
	actor: string,
	subject: string
): Promise<string | null> => {
	try {
		const { uri } = await jsonGet<{ uri: string }>(
			ctx,
			"org.tangled.feed.subscription.getForActor",
			{ actor: actor as Did, subject }
		);
		return rkeyFromUri(uri);
	} catch (cause) {
		if (cause instanceof ClientResponseError && httpStatusFor(cause) === 404) return null;
		throw cause;
	}
};

// creating always mints a record and unsubscribe only deletes one, so
// reuse an existing subscription instead of stacking
export const ensureEntitySubscription = async (
	agent: OAuthUserAgent,
	ctx: BobbinContext,
	actor: string,
	entityUri: string
): Promise<string> => {
	const existing = await getSubscriptionRkey(ctx, actor, entityUri);
	return existing ?? (await createEntitySubscription(agent, entityUri));
};

export type VouchKind = "vouch" | "denounce";

export interface VouchInput {
	kind: VouchKind;
	reason?: string;
	evidences?: string[];
}

export const putVouch = async (
	agent: OAuthUserAgent,
	subject: string,
	input: VouchInput
): Promise<string> => {
	const { uri } = await putRecord(agent, VOUCH_COLLECTION, subject, {
		$type: "sh.tangled.graph.vouch",
		kind: input.kind,
		...(input.reason ? { reason: input.reason } : {}),
		...(input.evidences?.length ? { evidences: input.evidences } : {}),
		createdAt: new Date().toISOString()
	});
	return rkeyFromUri(uri);
};

export const deleteVouch = async (agent: OAuthUserAgent, subject: string): Promise<void> => {
	await deleteRecord(agent, VOUCH_COLLECTION, subject);
};
export const getViewerVouch = async (
	ctx: BobbinContext,
	viewer: string,
	subject: string
): Promise<VouchInput | null> => {
	const { items } = await jsonGet<ShTangledGraphListNetworkVouches.$output>(
		ctx,
		"sh.tangled.graph.listNetworkVouches",
		{ actor: viewer as Did, limit: 100 } satisfies ShTangledGraphListNetworkVouches.$params
	);
	const match = items.find(
		(item) => didFromUri(item.uri) === viewer && rkeyFromUri(item.uri) === subject
	);
	if (!match) return null;
	const value = match.value as VouchRecord;
	return { kind: value.kind === "denounce" ? "denounce" : "vouch", reason: value.reason };
};