import type { IncomingMessage, ServerResponse } from 'http';
import { app } from 'electron';
import { existsSync, cpSync, mkdirSync, rmSync, readFileSync } from 'node:fs';
import { homedir } from 'node:os';
import { join } from 'node:path';
import {
  deleteChannelConfig,
  getChannelFormValues,
  listConfiguredChannels,
  saveChannelConfig,
  setChannelEnabled,
  validateChannelConfig,
  validateChannelCredentials,
} from '../../utils/channel-config';
import { assignChannelToAgent, clearAllBindingsForChannel } from '../../utils/agent-config';
import { whatsAppLoginManager } from '../../utils/whatsapp-login';
import type { HostApiContext } from '../context';
import { parseJsonBody, sendJson } from '../route-utils';

function scheduleGatewayChannelRestart(ctx: HostApiContext, reason: string): void {
  if (ctx.gatewayManager.getStatus().state === 'stopped') {
    return;
  }
  ctx.gatewayManager.debouncedRestart();
  void reason;
}

const FORCE_RESTART_CHANNELS = new Set(['dingtalk', 'wecom', 'feishu', 'whatsapp']);

function scheduleGatewayChannelSaveRefresh(
  ctx: HostApiContext,
  channelType: string,
  reason: string,
): void {
  if (ctx.gatewayManager.getStatus().state === 'stopped') {
    return;
  }
  if (FORCE_RESTART_CHANNELS.has(channelType)) {
    ctx.gatewayManager.debouncedRestart();
    void reason;
    return;
  }
  ctx.gatewayManager.debouncedReload();
  void reason;
}

// ── Generic plugin installer with version-aware upgrades ─────────

function readPluginVersion(pkgJsonPath: string): string | null {
  try {
    const raw = readFileSync(pkgJsonPath, 'utf-8');
    const parsed = JSON.parse(raw) as { version?: string };
    return parsed.version ?? null;
  } catch {
    return null;
  }
}

function ensurePluginInstalled(
  pluginDirName: string,
  candidateSources: string[],
  pluginLabel: string,
): { installed: boolean; warning?: string } {
  const targetDir = join(homedir(), '.openclaw', 'extensions', pluginDirName);
  const targetManifest = join(targetDir, 'openclaw.plugin.json');
  const targetPkgJson = join(targetDir, 'package.json');

  const sourceDir = candidateSources.find((dir) => existsSync(join(dir, 'openclaw.plugin.json')));

  // If already installed, check whether an upgrade is available
  if (existsSync(targetManifest)) {
    if (!sourceDir) return { installed: true }; // no bundled source to compare, keep existing
    const installedVersion = readPluginVersion(targetPkgJson);
    const sourceVersion = readPluginVersion(join(sourceDir, 'package.json'));
    if (!sourceVersion || !installedVersion || sourceVersion === installedVersion) {
      return { installed: true }; // same version or unable to compare
    }
    // Version differs — fall through to overwrite install
    console.log(
      `[plugin] Upgrading ${pluginLabel} plugin: ${installedVersion} → ${sourceVersion}`,
    );
  }

  // Fresh install or upgrade
  if (!sourceDir) {
    return {
      installed: false,
      warning: `Bundled ${pluginLabel} plugin mirror not found. Checked: ${candidateSources.join(' | ')}`,
    };
  }

  try {
    mkdirSync(join(homedir(), '.openclaw', 'extensions'), { recursive: true });
    rmSync(targetDir, { recursive: true, force: true });
    cpSync(sourceDir, targetDir, { recursive: true, dereference: true });
    if (!existsSync(join(targetDir, 'openclaw.plugin.json'))) {
      return { installed: false, warning: `Failed to install ${pluginLabel} plugin mirror (manifest missing).` };
    }
    return { installed: true };
  } catch {
    return { installed: false, warning: `Failed to install bundled ${pluginLabel} plugin mirror` };
  }
}

// ── Per-channel plugin helpers (thin wrappers around ensurePluginInstalled) ──

function buildCandidateSources(pluginDirName: string): string[] {
  return app.isPackaged
    ? [
      join(process.resourcesPath, 'openclaw-plugins', pluginDirName),
      join(process.resourcesPath, 'app.asar.unpacked', 'build', 'openclaw-plugins', pluginDirName),
      join(process.resourcesPath, 'app.asar.unpacked', 'openclaw-plugins', pluginDirName),
    ]
    : [
      join(app.getAppPath(), 'build', 'openclaw-plugins', pluginDirName),
      join(process.cwd(), 'build', 'openclaw-plugins', pluginDirName),
      join(__dirname, '../../../build/openclaw-plugins', pluginDirName),
    ];
}

function ensureDingTalkPluginInstalled(): { installed: boolean; warning?: string } {
  return ensurePluginInstalled('dingtalk', buildCandidateSources('dingtalk'), 'DingTalk');
}

function ensureWeComPluginInstalled(): { installed: boolean; warning?: string } {
  return ensurePluginInstalled('wecom', buildCandidateSources('wecom'), 'WeCom');
}

function ensureFeishuPluginInstalled(): { installed: boolean; warning?: string } {
  return ensurePluginInstalled(
    'feishu-openclaw-plugin',
    buildCandidateSources('feishu-openclaw-plugin'),
    'Feishu',
  );
}

function ensureQQBotPluginInstalled(): { installed: boolean; warning?: string } {
  return ensurePluginInstalled('qqbot', buildCandidateSources('qqbot'), 'QQ Bot');
}

function toComparableConfig(input: Record<string, unknown>): Record<string, string> {
  const next: Record<string, string> = {};
  for (const [key, value] of Object.entries(input)) {
    if (value === undefined || value === null) continue;
    if (typeof value === 'string') {
      next[key] = value.trim();
      continue;
    }
    if (typeof value === 'number' || typeof value === 'boolean') {
      next[key] = String(value);
    }
  }
  return next;
}

function isSameConfigValues(
  existing: Record<string, string> | undefined,
  incoming: Record<string, unknown>,
): boolean {
  if (!existing) return false;
  const next = toComparableConfig(incoming);
  const keys = new Set([...Object.keys(existing), ...Object.keys(next)]);
  if (keys.size === 0) return false;
  for (const key of keys) {
    if ((existing[key] ?? '') !== (next[key] ?? '')) {
      return false;
    }
  }
  return true;
}

function inferAgentIdFromAccountId(accountId: string): string {
  if (accountId === 'default') return 'main';
  return accountId;
}

async function ensureScopedChannelBinding(channelType: string, accountId?: string): Promise<void> {
  // Multi-agent safety: only bind when the caller explicitly scopes the account.
  // Global channel saves (no accountId) must not override routing to "main".
  if (!accountId) return;
  await assignChannelToAgent(inferAgentIdFromAccountId(accountId), channelType).catch(() => undefined);
}

export async function handleChannelRoutes(
  req: IncomingMessage,
  res: ServerResponse,
  url: URL,
  ctx: HostApiContext,
): Promise<boolean> {
  if (url.pathname === '/api/channels/configured' && req.method === 'GET') {
    sendJson(res, 200, { success: true, channels: await listConfiguredChannels() });
    return true;
  }

  if (url.pathname === '/api/channels/config/validate' && req.method === 'POST') {
    try {
      const body = await parseJsonBody<{ channelType: string }>(req);
      sendJson(res, 200, { success: true, ...(await validateChannelConfig(body.channelType)) });
    } catch (error) {
      sendJson(res, 500, { success: false, valid: false, errors: [String(error)], warnings: [] });
    }
    return true;
  }

  if (url.pathname === '/api/channels/credentials/validate' && req.method === 'POST') {
    try {
      const body = await parseJsonBody<{ channelType: string; config: Record<string, string> }>(req);
      sendJson(res, 200, { success: true, ...(await validateChannelCredentials(body.channelType, body.config)) });
    } catch (error) {
      sendJson(res, 500, { success: false, valid: false, errors: [String(error)], warnings: [] });
    }
    return true;
  }

  if (url.pathname === '/api/channels/whatsapp/start' && req.method === 'POST') {
    try {
      const body = await parseJsonBody<{ accountId: string }>(req);
      await whatsAppLoginManager.start(body.accountId);
      sendJson(res, 200, { success: true });
    } catch (error) {
      sendJson(res, 500, { success: false, error: String(error) });
    }
    return true;
  }

  if (url.pathname === '/api/channels/whatsapp/cancel' && req.method === 'POST') {
    try {
      await whatsAppLoginManager.stop();
      sendJson(res, 200, { success: true });
    } catch (error) {
      sendJson(res, 500, { success: false, error: String(error) });
    }
    return true;
  }

  if (url.pathname === '/api/channels/config' && req.method === 'POST') {
    try {
      const body = await parseJsonBody<{ channelType: string; config: Record<string, unknown>; accountId?: string }>(req);
      if (body.channelType === 'dingtalk') {
        const installResult = await ensureDingTalkPluginInstalled();
        if (!installResult.installed) {
          sendJson(res, 500, { success: false, error: installResult.warning || 'DingTalk plugin install failed' });
          return true;
        }
      }
      if (body.channelType === 'wecom') {
        const installResult = await ensureWeComPluginInstalled();
        if (!installResult.installed) {
          sendJson(res, 500, { success: false, error: installResult.warning || 'WeCom plugin install failed' });
          return true;
        }
      }
      if (body.channelType === 'qqbot') {
        const installResult = await ensureQQBotPluginInstalled();
        if (!installResult.installed) {
          sendJson(res, 500, { success: false, error: installResult.warning || 'QQ Bot plugin install failed' });
          return true;
        }
      }
      if (body.channelType === 'feishu') {
        const installResult = await ensureFeishuPluginInstalled();
        if (!installResult.installed) {
          sendJson(res, 500, { success: false, error: installResult.warning || 'Feishu plugin install failed' });
          return true;
        }
      }
      const existingValues = await getChannelFormValues(body.channelType, body.accountId);
      if (isSameConfigValues(existingValues, body.config)) {
        await ensureScopedChannelBinding(body.channelType, body.accountId);
        sendJson(res, 200, { success: true, noChange: true });
        return true;
      }
      await saveChannelConfig(body.channelType, body.config, body.accountId);
      await ensureScopedChannelBinding(body.channelType, body.accountId);
      scheduleGatewayChannelSaveRefresh(ctx, body.channelType, `channel:saveConfig:${body.channelType}`);
      sendJson(res, 200, { success: true });
    } catch (error) {
      sendJson(res, 500, { success: false, error: String(error) });
    }
    return true;
  }

  if (url.pathname === '/api/channels/config/enabled' && req.method === 'PUT') {
    try {
      const body = await parseJsonBody<{ channelType: string; enabled: boolean }>(req);
      await setChannelEnabled(body.channelType, body.enabled);
      scheduleGatewayChannelRestart(ctx, `channel:setEnabled:${body.channelType}`);
      sendJson(res, 200, { success: true });
    } catch (error) {
      sendJson(res, 500, { success: false, error: String(error) });
    }
    return true;
  }

  if (url.pathname.startsWith('/api/channels/config/') && req.method === 'GET') {
    try {
      const channelType = decodeURIComponent(url.pathname.slice('/api/channels/config/'.length));
      const accountId = url.searchParams.get('accountId') || undefined;
      sendJson(res, 200, {
        success: true,
        values: await getChannelFormValues(channelType, accountId),
      });
    } catch (error) {
      sendJson(res, 500, { success: false, error: String(error) });
    }
    return true;
  }

  if (url.pathname.startsWith('/api/channels/config/') && req.method === 'DELETE') {
    try {
      const channelType = decodeURIComponent(url.pathname.slice('/api/channels/config/'.length));
      await deleteChannelConfig(channelType);
      await clearAllBindingsForChannel(channelType);
      scheduleGatewayChannelRestart(ctx, `channel:deleteConfig:${channelType}`);
      sendJson(res, 200, { success: true });
    } catch (error) {
      sendJson(res, 500, { success: false, error: String(error) });
    }
    return true;
  }

  void ctx;
  return false;
}