import { ChannelSession } from '@webdrop/core';
import { cacheResource, getResource, listResources, removeResource, saveResource, type SavedResource } from '../database';
import { shareCache, isOfflineFailure } from './resourceMetadata';
import type { ShareSettingsPatch } from '../generated/api';
import { readShareInfo } from './shareState';
import type { Share, ShareSettings } from '../types';

import { active, blobs, getSession, sessions } from './sessions';
import { apiFetch, fail, readJson } from './http';
import { apiShareSettings, toShareInfo, type ShareWire } from './wire';
import { makeLink, toShareLink } from './links';
import { requireAccount } from './accountSession';




export async function createShare(settings: ShareSettings, captchaToken?: string): Promise<Share> {
  requireAccount();
  const endpointSecret = crypto.getRandomValues(new Uint8Array(32));
  const { session, request } = await ChannelSession.create({ mode: 'enc', endpointSecret });
  try {
    const body = {
      id: request.body.id,
      read_hash: request.body.read_hash,
      owner_hash: request.body.owner_hash,
      settings: apiShareSettings(settings),
    };
    const response = await apiFetch('/shares', {
      method: 'POST', cache: 'no-store',
      headers: { 'Content-Type': 'application/json', 'X-WD-Endpoint': request.headers['X-WD-Endpoint']!, ...(captchaToken ? { 'X-WD-Cap': captchaToken } : {}) },
      body: JSON.stringify(body),
    });
    const raw = await response.json() as ShareWire;
    const resource: SavedResource = {
      ...shareCache(raw),
      id: raw.id, kind: 'share', mode: 'enc', role: 'owner', mine: true,
      link: toShareLink(session.link(self.location.origin)),
      ownerLink: toShareLink(session.link(self.location.origin, 'owner')),
      endpointSecret: Uint8Array.from(session.endpointSecret),
      createdAt: raw.created_at, expiresAt: raw.expires_at, seats: 0,
      state: 'draft', maxVisitors: raw.settings.max_visitors,
      ttlSeconds: raw.settings.ttl_seconds,
      maxDownloads: raw.settings.file_max_downloads === 0 ? null : raw.settings.file_max_downloads,
      draftItems: [], manifestEntries: [],
    };
    await saveResource(resource);
    sessions.set(raw.id, session);
    return toShareInfo(raw, resource);
  } catch (error) {
    session.dispose();
    throw error;
  }
}

export async function joinShare(input: { link: { id: string; key: string } }): Promise<Share> {
  const existing = await getResource(input.link.id);
  const endpointSecret = existing?.endpointSecret ?? crypto.getRandomValues(new Uint8Array(32));
  const session = await ChannelSession.open(makeLink(self.location.origin, input.link.id, { k: input.link.key }), { endpointSecret });
  try {
    const raw = await readJson<ShareWire>(`/shares/${input.link.id}`, session.authHeaders('read'));
    if (raw.state !== 'sealed') throw fail(404, 'not_found');
    const resource: SavedResource = {
      ...shareCache(raw),
      id: input.link.id, kind: 'share', mode: 'enc', role: 'member', mine: false,
      link: toShareLink(makeLink(self.location.origin, input.link.id, { k: input.link.key })),
      endpointSecret: Uint8Array.from(session.endpointSecret), createdAt: raw.created_at, expiresAt: raw.expires_at,
      seats: 0, state: raw.state,
      ttlSeconds: raw.settings.ttl_seconds,
      maxVisitors: raw.settings.max_visitors, maxDownloads: raw.settings.file_max_downloads === 0 ? null : raw.settings.file_max_downloads,
    };
    await saveResource(resource);
    sessions.set(resource.id, session);
    return toShareInfo(raw, resource);
  } catch (error) {
    session.dispose();
    throw error;
  }
}

export async function updateShareSettings(id: string, patch: Partial<ShareSettings>): Promise<Share> {
  const { session, resource } = await getSession(id);
  if (resource.kind !== 'share' || !session.can('owner')) throw new Error('此分享不再可修改');
  const body: ShareSettingsPatch = {};
  if (patch.ttlSeconds !== undefined) body.ttl_seconds = patch.ttlSeconds;
  if (patch.maxVisitors !== undefined) body.max_visitors = patch.maxVisitors;
  if (patch.maxDownloads !== undefined) body.file_max_downloads = patch.maxDownloads ?? 0;
  const raw = await apiFetch(`/shares/${id}/settings`, {
    method: 'PATCH', headers: { ...session.authHeaders('owner'), 'Content-Type': 'application/json' }, body: JSON.stringify(body),
  }).then((response) => response.json() as Promise<ShareWire>);
  const updated = await cacheResource(resource, shareCache(raw));
  return toShareInfo(raw, updated);
}

export async function removeShare(id: string): Promise<void> {
  active.get(id)?.abort();
  active.delete(id);
  sessions.get(id)?.dispose();
  sessions.delete(id);
  for (const key of blobs.keys()) if (key.startsWith(`${id}:`)) blobs.delete(key);
  await removeResource(id);
}

export async function listSavedShares(): Promise<Share[]> {
  const saved = await listResources('share');
  const rows = await Promise.all(saved.map(async (resource): Promise<Share | null> => {
    try {
      const { session } = await getSession(resource.id);
      const raw = await readShareInfo(session, resource);
      const info = toShareInfo(raw, resource);
      await cacheResource(resource, shareCache(raw));
      return { ...info, dataSource: 'server' };
    } catch (error) {
      if (error instanceof Error && 'status' in error && (error.status === 404 || error.status === 410)) return null;
      if (!isOfflineFailure(error)) throw error;
      if (resource.shareMetadata) return { ...toShareInfo(resource.shareMetadata, resource), dataSource: 'cache' };
      return {
    id: resource.id, state: resource.state ?? 'draft', mine: resource.mine ?? false,
    link: resource.link, createdAt: resource.createdAt, expiresAt: resource.expiresAt,
    ttlSeconds: resource.ttlSeconds ?? Math.max(0, (resource.expiresAt - resource.createdAt) / 1000), maxVisitors: resource.maxVisitors ?? 0,
    maxDownloads: resource.maxDownloads ?? null,
    dataSource: 'cache',
      };
    }
  }));
  return rows.filter((row): row is Share => row !== null);
}