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import fs from 'node:fs/promises';
import path from 'node:path';
import { statePath } from './runtime-paths.js';

export const DELETED_MESSAGES_PATH = statePath('deleted-messages.json');
export const HIDDEN_SESSIONS_PATH = statePath('hidden-sessions.json');


export function emptyDeletedMessagesState() {
  return { version: 1, sessions: {} };
}

export function emptyHiddenSessionsState() {
  return { version: 1, sessions: {} };
}

export async function readDeletedMessagesState() {
  try {
    const raw = await fs.readFile(DELETED_MESSAGES_PATH, 'utf8');
    const parsed = JSON.parse(raw);
    return {
      version: 1,
      sessions: parsed && typeof parsed.sessions === 'object' && !Array.isArray(parsed.sessions)
        ? parsed.sessions
        : {}
    };
  } catch (error) {
    if (error.code !== 'ENOENT') {
      console.warn('[sessions] Failed to read deleted message state:', error.message);
    }
    return emptyDeletedMessagesState();
  }
}

export async function writeDeletedMessagesState(state) {
  await fs.mkdir(path.dirname(DELETED_MESSAGES_PATH), { recursive: true });
  await fs.writeFile(
    DELETED_MESSAGES_PATH,
    JSON.stringify({ version: 1, sessions: state.sessions || {} }, null, 2),
    'utf8'
  );
}

export async function readHiddenSessionsState() {
  try {
    const raw = await fs.readFile(HIDDEN_SESSIONS_PATH, 'utf8');
    const parsed = JSON.parse(raw);
    return {
      version: 1,
      sessions: parsed && typeof parsed.sessions === 'object' && !Array.isArray(parsed.sessions)
        ? parsed.sessions
        : {}
    };
  } catch (error) {
    if (error.code !== 'ENOENT') {
      console.warn('[sessions] Failed to read hidden session state:', error.message);
    }
    return emptyHiddenSessionsState();
  }
}

export async function writeHiddenSessionsState(state) {
  await fs.mkdir(path.dirname(HIDDEN_SESSIONS_PATH), { recursive: true });
  await fs.writeFile(
    HIDDEN_SESSIONS_PATH,
    JSON.stringify({ version: 1, sessions: state.sessions || {} }, null, 2),
    'utf8'
  );
}

export async function readHiddenSessionIds() {
  const state = await readHiddenSessionsState();
  return new Set(Object.keys(state.sessions || {}));
}

export async function hideSessionInMobile(session) {
  const id = String(session?.id || '').trim();
  if (!id) {
    const error = new Error('Session id is required');
    error.statusCode = 400;
    throw error;
  }

  const state = await readHiddenSessionsState();
  const existing = state.sessions[id];
  state.sessions[id] = {
    hiddenAt: existing?.hiddenAt || new Date().toISOString(),
    projectId: session.projectId || existing?.projectId || null,
    projectPath: session.cwd || existing?.projectPath || null,
    title: session.title || existing?.title || null
  };
  await writeHiddenSessionsState(state);
  return { sessionId: id, hiddenAt: state.sessions[id].hiddenAt };
}

export async function readDeletedMessageIds(sessionId) {
  const id = String(sessionId || '').trim();
  if (!id) {
    return new Set();
  }
  const state = await readDeletedMessagesState();
  return new Set(Object.keys(state.sessions?.[id] || {}));
}

export function filterDeletedMessages(messages, deletedIds) {
  if (!deletedIds.size) {
    return messages;
  }
  return messages.filter((message) => !deletedIds.has(String(message.id || '')));
}


export async function hideSessionMessage(sessionId, messageId) {
  const id = String(sessionId || '').trim();
  const itemId = String(messageId || '').trim();
  if (!id || !itemId) {
    const error = new Error('sessionId and messageId are required');
    error.statusCode = 400;
    throw error;
  }

  const state = await readDeletedMessagesState();
  if (!state.sessions[id] || typeof state.sessions[id] !== 'object' || Array.isArray(state.sessions[id])) {
    state.sessions[id] = {};
  }
  const existing = state.sessions[id][itemId];
  const deletedAt = existing?.deletedAt || new Date().toISOString();
  state.sessions[id][itemId] = { deletedAt };
  await writeDeletedMessagesState(state);
  return { sessionId: id, messageId: itemId, deletedAt };
}