import * as plugins from '../plugins.js';
import type { Cloudly } from '../classes.cloudly.js';
import { logger } from '../logger.js';
import { JumpCode } from './classes.jumpcode.js';

type IReqCreateNodeJumpCommand = plugins.servezoneInterfaces.requests.node.IReq_Any_Cloudly_CreateNodeJumpCommand['request'];
type IResCreateNodeJumpCommand = plugins.servezoneInterfaces.requests.node.IReq_Any_Cloudly_CreateNodeJumpCommand['response'];

interface IClaimJumpCodeRequest {
  jumpCode?: string;
  hostname?: string;
}

interface IClaimJumpCodeResponse {
  accepted: boolean;
  message?: string;
  nodeId?: string;
  cloudlyUrl?: string;
  coreflowJumpCode?: string;
}

export class CloudlyJumpManager {
  public cloudlyRef: Cloudly;
  public typedRouter = new plugins.typedrequest.TypedRouter();
  public CJumpCode = plugins.smartdata.setDefaultManagerForDoc(this, JumpCode);

  public get db() {
    return this.cloudlyRef.mongodbConnector.smartdataDb;
  }

  private defaultTtlMs = 1000 * 60 * 30;
  private maxTtlMs = 1000 * 60 * 60 * 24;

  constructor(cloudlyRefArg: Cloudly) {
    this.cloudlyRef = cloudlyRefArg;
    this.cloudlyRef.typedrouter.addTypedRouter(this.typedRouter);

    this.typedRouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.servezoneInterfaces.requests.node.IReq_Any_Cloudly_CreateNodeJumpCommand>('createNodeJumpCommand', async (requestDataArg) => {
        await plugins.smartguard.passGuardsOrReject(
          { identity: requestDataArg.identity },
          [this.cloudlyRef.authManager.adminIdentityGuard],
        );
        return await this.createNodeJumpCommand(requestDataArg);
      }),
    );
  }

  public async start() {
    logger.log('info', 'Jump manager started');
  }

  public async stop() {
    logger.log('info', 'Jump manager stopped');
  }

  public async createNodeJumpCommand(optionsArg: IReqCreateNodeJumpCommand): Promise<IResCreateNodeJumpCommand> {
    const cluster = await this.cloudlyRef.clusterManager.CCluster.getInstance({
      id: optionsArg.clusterId,
    });
    if (!cluster) {
      throw new plugins.typedrequest.TypedResponseError(`Cluster ${optionsArg.clusterId} not found`);
    }

    const now = Date.now();
    const ttlMs = this.normalizeTtl(optionsArg.ttlMs);
    const jumpCode = this.createJumpCode();
    const jumpCodeDoc = new this.CJumpCode({
      id: await this.CJumpCode.getNewId(),
      tokenHash: this.hashSecret(jumpCode),
      data: {
        clusterId: cluster.id,
        createdBy: optionsArg.identity.userId,
        role: optionsArg.role || 'worker',
        nodeType: optionsArg.nodeType || 'baremetal',
        createdAt: now,
        expiresAt: now + ttlMs,
      },
    });
    await jumpCodeDoc.save();

    const jumpUrl = `${this.getPublicCloudlyUrl()}/jump/${encodeURIComponent(jumpCode)}`;
    const setupUrl = `${jumpUrl}/setup.sh`;
    return {
      jumpCode,
      jumpUrl,
      setupUrl,
      command: `curl -fsSL '${jumpUrl}' | sudo bash`,
      expiresAt: jumpCodeDoc.data.expiresAt,
    };
  }

  public async handleJumpHttpRequest(ctxArg: plugins.typedserver.IRequestContext): Promise<Response> {
    const jumpCode = this.getCodeFromContext(ctxArg);
    if (this.shouldRenderHtml(ctxArg)) {
      return await this.createLandingPageResponse(jumpCode);
    }
    return await this.createSetupScriptResponse(jumpCode);
  }

  public async handleSetupScriptHttpRequest(ctxArg: plugins.typedserver.IRequestContext): Promise<Response> {
    return await this.createSetupScriptResponse(this.getCodeFromContext(ctxArg));
  }

  public async handleClaimHttpRequest(ctxArg: plugins.typedserver.IRequestContext): Promise<Response> {
    try {
      const requestData = await this.readJsonBody<IClaimJumpCodeRequest>(ctxArg);
      const response = await this.claimJumpCode(requestData);
      return this.createJsonResponse(200, response);
    } catch (error) {
      return this.createJsonResponse(400, {
        accepted: false,
        message: (error as Error).message,
      } satisfies IClaimJumpCodeResponse);
    }
  }

  public async claimJumpCode(requestDataArg: IClaimJumpCodeRequest): Promise<IClaimJumpCodeResponse> {
    if (!requestDataArg.jumpCode) {
      throw new Error('Jump code is missing');
    }

    const jumpCodeDoc = await this.getJumpCodeByCode(requestDataArg.jumpCode);
    if (!jumpCodeDoc) {
      throw new Error('Jump code is invalid');
    }
    if (jumpCodeDoc.data.consumedAt) {
      throw new Error('Jump code has already been used');
    }
    if (jumpCodeDoc.data.expiresAt <= Date.now()) {
      throw new Error('Jump code has expired');
    }

    const cluster = await this.cloudlyRef.clusterManager.CCluster.getInstance({
      id: jumpCodeDoc.data.clusterId,
    });
    if (!cluster) {
      throw new Error('Jump code references a missing cluster');
    }

    const clusterUser = await this.cloudlyRef.authManager.CUser.getInstance({
      id: cluster.data.userId,
    });
    const coreflowJumpCode = clusterUser?.data.tokens?.find((tokenArg) => tokenArg.expiresAt > Date.now())?.token;
    if (!coreflowJumpCode) {
      throw new Error('Cluster runtime token is missing or expired');
    }

    const nodeId = plugins.smartunique.shortId(8);
    const now = Date.now();
    const node = new this.cloudlyRef.nodeManager.CClusterNode();
    node.id = nodeId;
    node.data = {
      clusterId: cluster.id,
      nodeType: jumpCodeDoc.data.nodeType,
      status: 'initializing',
      role: jumpCodeDoc.data.role,
      joinedAt: now,
      lastHealthCheck: now,
      sshKeys: [],
      requiredDebianPackages: [],
    };
    await node.save();

    cluster.data.nodes = [
      ...(cluster.data.nodes || []).filter((nodeArg) => nodeArg.id !== node.id),
      await node.createSavableObject(),
    ];
    await cluster.save();

    jumpCodeDoc.data = {
      ...jumpCodeDoc.data,
      consumedAt: now,
      consumedByNodeId: node.id,
    };
    await jumpCodeDoc.save();

    return {
      accepted: true,
      nodeId: node.id,
      cloudlyUrl: cluster.data.cloudlyUrl || `${this.getPublicCloudlyUrl()}/`,
      coreflowJumpCode,
    };
  }

  private async createLandingPageResponse(jumpCodeArg: string) {
    const jumpCodeDoc = await this.getJumpCodeByCode(jumpCodeArg);
    let clusterName = 'Unknown cluster';
    let isUsable = false;
    if (jumpCodeDoc && !jumpCodeDoc.data.consumedAt && jumpCodeDoc.data.expiresAt > Date.now()) {
      const cluster = await this.cloudlyRef.clusterManager.CCluster.getInstance({
        id: jumpCodeDoc.data.clusterId,
      });
      clusterName = cluster?.data.name || jumpCodeDoc.data.clusterId;
      isUsable = true;
    }
    const jumpUrl = `${this.getPublicCloudlyUrl()}/jump/${encodeURIComponent(jumpCodeArg)}`;
    const command = `curl -fsSL '${jumpUrl}' | sudo bash`;
    const html = `<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Cloudly Jump</title>
    <style>
      body { margin: 0; font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: #0d1117; color: #f0f6fc; }
      main { max-width: 760px; margin: 10vh auto; padding: 32px; }
      .card { border: 1px solid #30363d; border-radius: 18px; background: #161b22; padding: 28px; box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35); }
      .label { color: #8b949e; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; }
      h1 { margin: 8px 0 12px; font-size: 34px; }
      p { color: #c9d1d9; line-height: 1.55; }
      pre { white-space: pre-wrap; word-break: break-all; background: #0d1117; border: 1px solid #30363d; border-radius: 12px; padding: 16px; color: #7ee787; }
      .status { display: inline-block; margin-top: 16px; padding: 6px 10px; border-radius: 999px; background: ${isUsable ? '#17391f' : '#3d1d1d'}; color: ${isUsable ? '#7ee787' : '#ff7b72'}; }
    </style>
  </head>
  <body>
    <main>
      <div class="card">
        <div class="label">Cloudly Jump</div>
        <h1>Connect System</h1>
        <p>Cluster: <strong>${this.escapeHtml(clusterName)}</strong></p>
        <p>Run this command on the Linux system you want to connect:</p>
        <pre>${this.escapeHtml(command)}</pre>
        <div class="status">${isUsable ? 'Ready to use' : 'This jump code is invalid, expired, or already used'}</div>
      </div>
    </main>
  </body>
</html>`;
    return new Response(html, {
      status: isUsable ? 200 : 404,
      headers: {
        'Content-Type': 'text/html; charset=utf-8',
      },
    });
  }

  private async createSetupScriptResponse(jumpCodeArg: string) {
    if (!jumpCodeArg || !(await this.isJumpCodeUsable(jumpCodeArg))) {
      return new Response('jump code is invalid, expired, or already used\n', {
        status: 404,
        headers: {
          'Content-Type': 'text/plain; charset=utf-8',
        },
      });
    }
    return new Response(this.createSetupScript(jumpCodeArg), {
      headers: {
        'Content-Type': 'application/x-sh; charset=utf-8',
      },
    });
  }

  private createSetupScript(jumpCodeArg: string) {
    const claimUrl = `${this.getPublicCloudlyUrl()}/jump/v1/claim`;
    return `#!/usr/bin/env bash
set -euo pipefail

if [ "$(id -u)" -ne 0 ]; then
  echo "Cloudly jump setup must run as root. Re-run with sudo." >&2
  exit 1
fi

export DEBIAN_FRONTEND=noninteractive
export JUMP_CODE='${this.escapeShellValue(jumpCodeArg)}'
export CLAIM_URL='${this.escapeShellValue(claimUrl)}'

echo "Preparing system for Cloudly jump..."
apt-get update
apt-get install -y --force-yes curl ca-certificates git

if ! command -v docker >/dev/null 2>&1; then
  curl -sSL https://get.docker.com/ | sh
fi

if ! command -v node >/dev/null 2>&1; then
  curl -sL https://deb.nodesource.com/setup_18.x | bash
  apt-get install -y --force-yes nodejs
fi

if ! command -v pnpm >/dev/null 2>&1; then
  curl -fsSL https://get.pnpm.io/install.sh | sh -
fi

export PNPM_HOME="\${PNPM_HOME:-/root/.local/share/pnpm}"
export PATH="\${PNPM_HOME}:\${PATH}"

pnpm install -g @serve.zone/spark

REQUEST_BODY="$(node -e 'process.stdout.write(JSON.stringify({ jumpCode: process.env.JUMP_CODE, hostname: require("os").hostname() }))')"
CLAIM_RESPONSE="$(curl -fsSL -X POST "\${CLAIM_URL}" -H 'content-type: application/json' --data "\${REQUEST_BODY}")"

export CLAIM_RESPONSE
CLOUDLY_URL="$(node -e 'const data = JSON.parse(process.env.CLAIM_RESPONSE); if (!data.accepted) { throw new Error(data.message || "Cloudly rejected jump code"); } process.stdout.write(data.cloudlyUrl);')"
COREFLOW_JUMPCODE="$(node -e 'const data = JSON.parse(process.env.CLAIM_RESPONSE); if (!data.coreflowJumpCode) { throw new Error("Cloudly did not return a Coreflow jump code"); } process.stdout.write(data.coreflowJumpCode);')"

spark installdaemon --mode=coreflow-node --cloudlyUrl="\${CLOUDLY_URL}" --jumpcode="\${COREFLOW_JUMPCODE}"

echo "Cloudly jump completed. This system is now connected."
`;
  }

  private async getJumpCodeByCode(jumpCodeArg: string) {
    const jumpCodes = await this.CJumpCode.getInstances({
      tokenHash: this.hashSecret(jumpCodeArg),
    });
    return jumpCodes[0] || null;
  }

  private async isJumpCodeUsable(jumpCodeArg: string) {
    const jumpCodeDoc = await this.getJumpCodeByCode(jumpCodeArg);
    return Boolean(jumpCodeDoc && !jumpCodeDoc.data.consumedAt && jumpCodeDoc.data.expiresAt > Date.now());
  }

  private getCodeFromContext(ctxArg: plugins.typedserver.IRequestContext) {
    return ctxArg.params.code || ctxArg.url.pathname.split('/').filter(Boolean)[1] || '';
  }

  private shouldRenderHtml(ctxArg: plugins.typedserver.IRequestContext) {
    const acceptHeader = ctxArg.headers.get('accept') || '';
    const userAgent = ctxArg.headers.get('user-agent') || '';
    return acceptHeader.includes('text/html') && !/(curl|wget|httpie|fetch)/i.test(userAgent);
  }

  private createJumpCode() {
    return plugins.crypto.randomBytes(12).toString('base64url');
  }

  private normalizeTtl(ttlMsArg?: number) {
    if (!ttlMsArg || !Number.isFinite(ttlMsArg)) {
      return this.defaultTtlMs;
    }
    return Math.min(Math.max(ttlMsArg, 1000 * 60), this.maxTtlMs);
  }

  private hashSecret(secretArg: string) {
    return plugins.crypto.createHash('sha256').update(secretArg).digest('hex');
  }

  private getPublicCloudlyUrl() {
    const sslMode = this.cloudlyRef.config.data.sslMode;
    const protocol = sslMode === 'none' ? 'http' : 'https';
    const port = String(this.cloudlyRef.config.data.publicPort || (protocol === 'https' ? '443' : '80'));
    const includePort = !((protocol === 'https' && port === '443') || (protocol === 'http' && port === '80'));
    return `${protocol}://${this.cloudlyRef.config.data.publicUrl}${includePort ? `:${port}` : ''}`;
  }

  private async readJsonBody<T>(ctxArg: plugins.typedserver.IRequestContext): Promise<T> {
    const bodyString = (await ctxArg.text()).trim();
    return bodyString ? JSON.parse(bodyString) as T : {} as T;
  }

  private createJsonResponse(statusCodeArg: number, bodyArg: object): Response {
    return new Response(JSON.stringify(bodyArg), {
      status: statusCodeArg,
      headers: {
        'Content-Type': 'application/json',
      },
    });
  }

  private escapeHtml(valueArg: string) {
    return valueArg
      .replaceAll('&', '&amp;')
      .replaceAll('<', '&lt;')
      .replaceAll('>', '&gt;')
      .replaceAll('"', '&quot;')
      .replaceAll("'", '&#39;');
  }

  private escapeShellValue(valueArg: string) {
    return valueArg.replaceAll("'", "'\\''");
  }
}