/**
 * Postiz API client — reads per-space credentials from module settings
 * and forwards authenticated requests to the Postiz public API.
 *
 * Follows the same pattern as listmonk-proxy.ts.
 */

import { loadCommunity, getDocumentData } from "../../../server/community-store";

export interface PostizConfig {
	url: string;
	apiKey: string;
}

/** Read Postiz credentials from the space's module settings. */
export async function getPostizConfig(spaceSlug: string): Promise<PostizConfig | null> {
	await loadCommunity(spaceSlug);
	const data = getDocumentData(spaceSlug);
	if (!data) return null;

	const settings = data.meta.moduleSettings?.rsocials;
	if (!settings) return null;

	const url = settings.postizUrl as string | undefined;
	const apiKey = settings.postizApiKey as string | undefined;

	if (!url || !apiKey) return null;
	return { url: url.replace(/\/+$/, ''), apiKey };
}

/** Make an authenticated request to the Postiz API.
 *
 * Postiz's public API expects the raw API key in the Authorization header
 * (NOT `Bearer <key>`). The API lives at `<hostname>/api/public/v1/*`; we
 * tolerate either `config.url = 'https://host'` or `config.url = 'https://host/api'`
 * by inserting `/api` when missing.
 */
export async function postizFetch(
	config: PostizConfig,
	path: string,
	opts: RequestInit = {},
): Promise<Response> {
	const headers = new Headers(opts.headers);
	headers.set("Authorization", config.apiKey);
	if (!headers.has("Content-Type") && opts.body) {
		headers.set("Content-Type", "application/json");
	}

	const base = config.url.endsWith('/api') ? config.url : `${config.url}/api`;
	return fetch(`${base}${path}`, { ...opts, headers });
}

/** GET /public/v1/integrations — list connected social channels. */
export async function getIntegrations(config: PostizConfig) {
	const res = await postizFetch(config, "/public/v1/integrations");
	if (!res.ok) throw new Error(`Postiz integrations error: ${res.status}`);
	return res.json();
}

/** POST /public/v1/posts — create a single post (draft, schedule, or now).
 *
 * Postiz expects a nested shape:
 *   { type, date, shortLink, tags, posts: [{ integration: {id}, value: [{content}], settings: {__type, ...} }] }
 *
 * Callers pass integrations as {id, identifier} tuples; identifier populates
 * settings.__type which Postiz uses to route to the correct provider handler.
 */
export interface PostizIntegrationRef {
	id: string;
	identifier: string; // e.g. 'x', 'linkedin', 'bluesky'
	/** Per-integration settings overrides merged on top of defaults. */
	settings?: Record<string, unknown>;
	/** Optional title (YouTube/Reddit/Pinterest) — forwarded into settings. */
	title?: string;
}

// Platform-specific settings Postiz validates on POST /posts. Keys that are
// required-non-empty for each provider live here. We merge defaults when the
// caller doesn't supply overrides.
function defaultSettingsFor(identifier: string): Record<string, unknown> {
	const base: Record<string, unknown> = { __type: identifier };
	switch (identifier) {
		case 'x':
			base.who_can_reply_post = 'everyone';
			break;
		case 'linkedin':
			base.post_to_company = false;
			break;
		case 'instagram':
			base.post_type = 'post';
			break;
		case 'youtube':
			base.type = 'public';
			base.title = '';
			base.category = '22';
			break;
		// Others (bluesky, threads, mastodon, reddit, ...) don't require settings
		// beyond __type as of Postiz 5.x.
	}
	return base;
}

/** Merge caller overrides on top of defaults while preserving `__type`. */
function mergeSettings(
	identifier: string,
	overrides?: Record<string, unknown>,
	title?: string,
): Record<string, unknown> {
	const merged = { ...defaultSettingsFor(identifier), ...(overrides || {}) };
	if (title !== undefined) merged.title = title;
	merged.__type = identifier; // always wins — Postiz routes on this
	return merged;
}

export async function createPost(
	config: PostizConfig,
	payload: {
		content: string;
		integrations: PostizIntegrationRef[];
		type: 'draft' | 'schedule' | 'now';
		scheduledAt?: string;
		group?: string;
	},
) {
	const body = {
		type: payload.type,
		date: payload.scheduledAt || new Date().toISOString(),
		shortLink: false,
		tags: [] as unknown[],
		posts: payload.integrations.map(integ => ({
			integration: { id: integ.id },
			value: [{ content: payload.content, image: [] as unknown[] }],
			...(payload.group ? { group: payload.group } : {}),
			settings: mergeSettings(integ.identifier, integ.settings, integ.title),
		})),
	};
	const res = await postizFetch(config, "/public/v1/posts", {
		method: "POST",
		body: JSON.stringify(body),
	});
	if (!res.ok) {
		const text = await res.text().catch(() => '');
		throw new Error(`Postiz createPost error: ${res.status} ${text}`);
	}
	return res.json();
}

/** GET /public/v1/posts — list posts in a date range (used for status reconciliation). */
export interface PostizListedPost {
	id: string;
	content?: string;
	publishDate?: string;
	releaseURL?: string;
	state: 'QUEUE' | 'PUBLISHED' | 'ERROR' | 'DRAFT';
	integration?: { id: string; providerIdentifier?: string; name?: string };
}

export async function listPosts(
	config: PostizConfig,
	startDate: Date,
	endDate: Date,
): Promise<PostizListedPost[]> {
	const qs = new URLSearchParams({
		startDate: startDate.toISOString(),
		endDate: endDate.toISOString(),
	});
	const res = await postizFetch(config, `/public/v1/posts?${qs}`);
	if (!res.ok) throw new Error(`Postiz listPosts error: ${res.status}`);
	const data = await res.json();
	// Postiz wraps list as { posts: [...] }; be defensive against raw array.
	if (Array.isArray(data)) return data as PostizListedPost[];
	if (Array.isArray(data?.posts)) return data.posts as PostizListedPost[];
	return [];
}

/** DELETE /public/v1/posts/:id — remove a queued post from Postiz.
 *
 * Used by the planner's "resync" flow: when a local node has drifted from
 * what was sent (detected via postizSyncedHash), we delete + recreate at
 * Postiz so the scheduler publishes the latest content. Postiz returns 404
 * if the post was already published or never existed; we treat that as a
 * no-op so the caller can proceed to recreate.
 */
export async function deletePost(
	config: PostizConfig,
	postizPostId: string,
): Promise<{ ok: true } | { ok: false; status: number; error: string }> {
	const res = await postizFetch(config, `/public/v1/posts/${encodeURIComponent(postizPostId)}`, {
		method: "DELETE",
	});
	if (res.ok || res.status === 404) return { ok: true };
	const text = await res.text().catch(() => "");
	return { ok: false, status: res.status, error: text || res.statusText };
}

/** Create a thread — single Postiz post whose `value` array carries each tweet.
 *
 * Postiz treats the `value` array on a PostItem as the thread segments, so we
 * send ONE request with multiple value entries, not N grouped requests.
 */
export async function createThread(
	config: PostizConfig,
	tweets: string[],
	opts: {
		integrations: PostizIntegrationRef[];
		type: 'draft' | 'schedule' | 'now';
		scheduledAt?: string;
	},
) {
	const body = {
		type: opts.type,
		date: opts.scheduledAt || new Date().toISOString(),
		shortLink: false,
		tags: [] as unknown[],
		posts: opts.integrations.map(integ => ({
			integration: { id: integ.id },
			value: tweets.map(t => ({ content: t, image: [] as unknown[] })),
			settings: mergeSettings(integ.identifier, integ.settings, integ.title),
		})),
	};
	const res = await postizFetch(config, "/public/v1/posts", {
		method: "POST",
		body: JSON.stringify(body),
	});
	if (!res.ok) {
		const text = await res.text().catch(() => '');
		throw new Error(`Postiz createThread error: ${res.status} ${text}`);
	}
	return res.json();
}