import type { OAuthUserAgent } from "@atcute/oauth-browser-client";
import { createCob, eraseCob, updateCob, type CobRecord, type CobRef } from "#lib/api/cob.ts";
import { datetimeOf, nsidOf, type Did, type KnotOrigin, type LabelKey } from "#lib/api/syntax.ts";
import type { TicketRecord, TicketState } from "#lib/api/records.ts";

// a pull is a ticket with a target branch
export const TICKET_COLLECTION = nsidOf("org.tangled.track.ticket");

export interface TicketProse {
	title: string;
	body: string;
	targetBranch?: string;
	tangledLabels?: readonly LabelKey[];
}

const titleOf = (text: string): TicketRecord["title"] => ({
	$type: "org.tangled.markup.markdown#inline",
	text
});

// the knot refuses an empty markdown body, so leave a blank one out
const bodyOf = (text: string, current?: TicketRecord["body"]): TicketRecord["body"] =>
	text.trim() ? { ...current, $type: "org.tangled.markup.markdown", text } : undefined;

const labelsOf = (keys: readonly LabelKey[]) =>
	keys.length
		? keys.map((key) => ({ $type: "org.tangled.label.defs#labelToken" as const, key }))
		: undefined;

export const createTicket = async (
	agent: OAuthUserAgent,
	knot: KnotOrigin,
	repo: Did,
	{ title, body, targetBranch, tangledLabels }: TicketProse
): Promise<CobRecord<TicketRecord>> => {
	const record: TicketRecord = {
		$type: "org.tangled.track.ticket",
		title: titleOf(title),
		body: bodyOf(body),
		state: "open",
		targetBranch,
		...(tangledLabels ? { tangledLabels: labelsOf(tangledLabels) } : {}),
		createdAt: datetimeOf(new Date().toISOString())
	};
	return { ...(await createCob(agent, knot, repo, TICKET_COLLECTION, record)), value: record };
};

// a put replaces everything, so start from the stored record
export const editTicket = (
	agent: OAuthUserAgent,
	knot: KnotOrigin,
	from: CobRef,
	{ title, body, targetBranch, tangledLabels }: TicketProse
): Promise<CobRecord<TicketRecord>> =>
	updateCob<TicketRecord>(agent, knot, from, (current) => ({
		...current,
		title: titleOf(title),
		body: bodyOf(body, current.body),
		targetBranch: targetBranch ?? current.targetBranch,
		...(tangledLabels ? { tangledLabels: labelsOf(tangledLabels) } : {})
	}));

export const setTicketState = (
	agent: OAuthUserAgent,
	knot: KnotOrigin,
	from: CobRef,
	state: TicketState
): Promise<CobRecord<TicketRecord>> =>
	updateCob<TicketRecord>(agent, knot, from, (current) => ({ ...current, state }));

export const setTicketLabels = (
	agent: OAuthUserAgent,
	knot: KnotOrigin,
	from: CobRef,
	keys: readonly LabelKey[]
): Promise<CobRecord<TicketRecord>> =>
	updateCob<TicketRecord>(agent, knot, from, (current) => ({
		...current,
		tangledLabels: labelsOf(keys)
	}));

export const eraseTicket = (agent: OAuthUserAgent, knot: KnotOrigin, from: CobRef): Promise<void> =>
	eraseCob(agent, knot, from);