import Docker, { ContainerInfo } from "dockerode";
import { writeFileSync } from "fs";
import * as process from "process";
import rimraf from "rimraf";
import * as tmp from 'tmp';import getPort, {portNumbers} from 'get-port';
import { INTERNAL_IP } from "../config.js";


const docker = new Docker();

export async function createContainer(imageName: string, containerName: string): Promise<{
  id: string,
  port: number
}> {

  const port = await getPort({ host: INTERNAL_IP, port: portNumbers(52300, 52399)});

  if(await isContainerNameInUse(containerName)) {
    await stopAndRemoveContainerByName(containerName);
  }

  const containerOptions: Docker.ContainerCreateOptions = {
    Image: imageName,
    name: containerName,
    WorkingDir: '/app',
    HostConfig: {
      AutoRemove: false,
      RestartPolicy: {
        Name: "always"
      },
      PortBindings: {
        '3000/tcp': [{ HostPort: '' + port }]
      }
    },
  };

  try {
    const container = await docker.createContainer(containerOptions);
    await container.start();
    console.log("Started", containerName, "with port", port, '> 3000');
    await checkContainerStatus(container.id);
    return {
      id: container.id,
      port
    };
  } catch (err) {
    console.error("Error creating container:", err);
    throw err;
  }
}

export async function listContainers() {
  return (await docker.listContainers())
    .filter((container) => {
      return container.Names[0].startsWith('/deploy-');
    });
}

export async function getContainerInfo(containerId: string): Promise<Docker.ContainerInspectInfo> {
  const docker = new Docker();
  const container = docker.getContainer(containerId);
  const containerInfo = await container.inspect();
  return containerInfo;
}

export async function checkImageExists(imageName: string) {
  const images = await docker.listImages();
  const imageExists = images.some(image => {
    if (image.RepoTags) {
      return image.RepoTags.includes(imageName);
    } else {
      return false;
    }
  });
  return imageExists;
}

export async function pullImage(imageName: string): Promise<void> {
  const imageExists = await checkImageExists(imageName);

  if (!imageExists) {
    console.log(`Pulling image ${imageName}`);
    return new Promise((resolve, reject) => {
      docker.pull(imageName, (err, stream) => {
        if (err) {
          reject(err);
        }
        docker.modem.followProgress(stream, (err: Error | null, output: unknown[]) => {
          if (err) {
            reject(err);
          }
          console.log(`Image ${imageName} has been pulled`);
          resolve();
        });
      });
    });
  } else {
    console.log(`Image ${imageName} already exists`);
    return Promise.resolve();
  }
}

export async function attachLogs(containerId: string): Promise<NodeJS.ReadableStream> {
  const container = docker.getContainer(containerId);
  const logsStream = await container.logs({
    follow: true,
    stdout: true,
    stderr: true,
  });
  return logsStream;
}

export async function isContainerNameInUse(name: string): Promise<boolean> {
  const containers = await docker.listContainers({ all: true });
  return containers.some((container: ContainerInfo) =>
    container.Names.includes(`/${name}`)
  );
}

async function stopAndRemoveContainerByName(name) {
  const containers = await docker.listContainers({ all: true });
  const matchingContainers = containers.filter(container => container.Names.includes(`/${name}`));
  if (matchingContainers.length === 0) {
    throw new Error(`No container with name '${name}' was found`);
  }
  const stoppedContainer = docker.getContainer(matchingContainers[0].Id);
  try {
    await stoppedContainer.stop();
  } catch (error) {
    console.error(`Failed to stop container ${name}: ${error.message}`);
  }
  try {
    await stoppedContainer.remove();
    console.log(`Container ${name} removed`);
  } catch (error) {
    console.error(`Failed to remove container ${name}: ${error.message}`);
  }
}

async function checkContainerStatus(containerId) {
  const container = docker.getContainer(containerId);
  const containerInfo = await container.inspect();
  const status = containerInfo.State.Status;
  console.log(`Container status: ${status}`);
  return status;
}

export async function runCommandInContainer(containerId: string, command: string[]) {
  console.log('$', ...command);
  const container = await docker.getContainer(containerId);

  const exec = await container.exec({
    Cmd: command,
    AttachStdout: true,
    AttachStderr: true,
  });

  const stream = await exec.start({});
  await new Promise((resolve, reject) => {
    container.modem.demuxStream(stream, process.stdout, process.stderr);
    stream.on('end', resolve);
    stream.on('error', reject);
  });
}

export async function restartContainer(containerId: string) {
  const docker = new Docker();
  const container = await docker.getContainer(containerId);

  console.log(`Restarting container ${containerId}...`);
  await container.restart();

  await checkContainerStatus(containerId);
}

export async function stopContainer(id: string) {
  const docker = new Docker();
  const container = await docker.getContainer(id);
  await container.stop();
  await checkContainerStatus(id);
}

export async function startContainer(id: string) {
  const docker = new Docker();
  const container = await docker.getContainer(id);
  await container.start();
  await checkContainerStatus(id);
}

interface BuildDockerImageOptions {
  cloneUrl: string;
  user: string;
  name: string;
  branch: string;
}

function createDockerfile(cloneUrl: string, branch: string) {
  return `
  FROM node:lts-alpine3.17
  
  RUN apk add git

  WORKDIR /app
  
  RUN git clone "${cloneUrl}" /app --depth 1 -b ${branch}
  
  RUN yarn && yarn build
  
  EXPOSE 3000
  
  CMD yarn start`.trim();
}

export async function buildDockerImage(options: BuildDockerImageOptions) {

  const {
    name: context
  } = tmp.dirSync();

  const {
    user,
    name,
    branch,
    cloneUrl
  } = options;

  const imageName = `${user}/${name}:${branch}`;
  
  let id = null;

  try {
    
    writeFileSync(context + '/Dockerfile', createDockerfile(cloneUrl, branch));

    const stream = await docker.buildImage({
      src: [ 'Dockerfile' ],
      context,
    }, {
      //@ts-ignore
      nocache: true,
      t: imageName
    });

    //@ts-ignore
    stream.on('data', d => {
      const data = JSON.parse(d);
      const text = data.stream ?? '';
      process.stdout.write(text);
      if(text.startsWith("Successfully built")) {
        const potentialId = text.split(" ")[2];
        id = potentialId;
      }
    });

    await new Promise((resolve) => {
      //@ts-ignore
      docker.modem.followProgress(stream, () => {
        resolve(void 0);
      });
    });

    if(id === null) throw new Error("Unable to generate image " + imageName)

    console.log("Built Image", imageName);

  } catch (e) {
    console.log('do we get here?')
    await rimraf(context);
    throw e;
  }
  await rimraf(context);
  return imageName
}