import * as plugins from '../plugins.ts';
import { defaultConfig, type IObjectStorageConfig } from '../types.ts';
import type * as interfaces from '../../ts_interfaces/index.ts';
import { OpsServer } from '../opsserver/index.ts';
import { PolicyManager } from './policymanager.ts';
import { AuditLogger } from './auditlogger.ts';

interface IPersistedAdminConfig {
  accessCredentials?: Array<{ accessKeyId: string; secretAccessKey: string }>;
}

export class ObjectStorageContainer {
  public config: IObjectStorageConfig;
  public smartstorageInstance!: plugins.smartstorage.SmartStorage;
  public s3Client!: plugins.S3Client;
  public opsServer: OpsServer;
  public policyManager: PolicyManager;
  public auditLogger: AuditLogger;
  public startedAt: number = 0;
  private envAccessCredentialsProvided = false;

  constructor(configArg?: Partial<IObjectStorageConfig>) {
    this.config = { ...defaultConfig, ...configArg };

    // Read environment variables (override config)
    const envPort = Deno.env.get('OBJST_PORT');
    if (envPort) this.config.objstPort = parseInt(envPort, 10);

    const envUiPort = Deno.env.get('UI_PORT');
    if (envUiPort) this.config.uiPort = parseInt(envUiPort, 10);

    const envStorageDir = Deno.env.get('OBJST_STORAGE_DIR');
    if (envStorageDir) this.config.storageDirectory = envStorageDir;

    const envAccessKey = Deno.env.get('OBJST_ACCESS_KEY');
    const envSecretKey = Deno.env.get('OBJST_SECRET_KEY');
    if (envAccessKey && envSecretKey) {
      this.envAccessCredentialsProvided = true;
      this.config.accessCredentials = [
        { accessKeyId: envAccessKey, secretAccessKey: envSecretKey },
      ];
    }

    const envAdminPassword = Deno.env.get('OBJST_ADMIN_PASSWORD');
    if (envAdminPassword) this.config.adminPassword = envAdminPassword;

    const envRegion = Deno.env.get('OBJST_REGION');
    if (envRegion) this.config.region = envRegion;

    // Cluster environment variables
    const envClusterEnabled = Deno.env.get('OBJST_CLUSTER_ENABLED');
    if (envClusterEnabled) {
      this.config.clusterEnabled = envClusterEnabled === 'true' || envClusterEnabled === '1';
    }

    const envClusterNodeId = Deno.env.get('OBJST_CLUSTER_NODE_ID');
    if (envClusterNodeId) this.config.clusterNodeId = envClusterNodeId;

    const envClusterQuicPort = Deno.env.get('OBJST_CLUSTER_QUIC_PORT');
    if (envClusterQuicPort) this.config.clusterQuicPort = parseInt(envClusterQuicPort, 10);

    const envClusterSeedNodes = Deno.env.get('OBJST_CLUSTER_SEED_NODES');
    if (envClusterSeedNodes) {
      this.config.clusterSeedNodes = envClusterSeedNodes.split(',').map((s) => s.trim()).filter(
        Boolean,
      );
    }

    const envDrivePaths = Deno.env.get('OBJST_DRIVE_PATHS');
    if (envDrivePaths) {
      this.config.drivePaths = envDrivePaths.split(',').map((s) => s.trim()).filter(Boolean);
    }

    const envErasureDataShards = Deno.env.get('OBJST_ERASURE_DATA_SHARDS');
    if (envErasureDataShards) this.config.erasureDataShards = parseInt(envErasureDataShards, 10);

    const envErasureParityShards = Deno.env.get('OBJST_ERASURE_PARITY_SHARDS');
    if (envErasureParityShards) {
      this.config.erasureParityShards = parseInt(envErasureParityShards, 10);
    }

    const envErasureChunkSize = Deno.env.get('OBJST_ERASURE_CHUNK_SIZE');
    if (envErasureChunkSize) this.config.erasureChunkSizeBytes = parseInt(envErasureChunkSize, 10);

    const envHeartbeatInterval = Deno.env.get('OBJST_HEARTBEAT_INTERVAL_MS');
    if (envHeartbeatInterval) {
      this.config.clusterHeartbeatIntervalMs = parseInt(envHeartbeatInterval, 10);
    }

    const envHeartbeatTimeout = Deno.env.get('OBJST_HEARTBEAT_TIMEOUT_MS');
    if (envHeartbeatTimeout) {
      this.config.clusterHeartbeatTimeoutMs = parseInt(envHeartbeatTimeout, 10);
    }

    this.opsServer = new OpsServer(this);
    this.policyManager = new PolicyManager(this);
    this.auditLogger = new AuditLogger(this.config.storageDirectory);
  }

  public async start(): Promise<void> {
    this.assertSecureStartupConfig();
    await this.loadPersistedAdminConfig();

    console.log(`Starting ObjectStorage...`);
    console.log(`  Storage port: ${this.config.objstPort}`);
    console.log(`  UI port: ${this.config.uiPort}`);
    console.log(`  Storage: ${this.config.storageDirectory}`);
    console.log(`  Region:  ${this.config.region}`);
    console.log(`  Cluster: ${this.config.clusterEnabled ? 'enabled' : 'disabled'}`);
    if (this.config.clusterEnabled) {
      console.log(`  Node ID: ${this.config.clusterNodeId || '(auto-generated)'}`);
      console.log(`  QUIC Port: ${this.config.clusterQuicPort}`);
      console.log(`  Seed Nodes: ${this.config.clusterSeedNodes.join(', ') || '(none)'}`);
      console.log(
        `  Drives: ${
          this.config.drivePaths.length > 0
            ? this.config.drivePaths.join(', ')
            : this.config.storageDirectory
        }`,
      );
      console.log(`  Erasure: ${this.config.erasureDataShards}+${this.config.erasureParityShards}`);
    }

    this.smartstorageInstance = await plugins.smartstorage.SmartStorage.createAndStart(
      this.buildSmartstorageConfig(),
    );

    this.startedAt = Date.now();
    console.log(`Storage server started on port ${this.config.objstPort}`);

    await this.refreshManagementClient();

    // Load named policies
    await this.policyManager.load();

    // Start UI server
    await this.opsServer.start(this.config.uiPort);
    console.log(`Management UI started on port ${this.config.uiPort}`);
  }

  public async stop(): Promise<void> {
    console.log('Stopping ObjectStorage...');
    await this.opsServer.stop();
    await this.smartstorageInstance.stop();
    console.log('ObjectStorage stopped.');
  }

  public async replaceAccessCredentials(
    credentials: Array<{ accessKeyId: string; secretAccessKey: string }>,
  ): Promise<void> {
    const nextCredentials = credentials.map((credential) => ({ ...credential }));
    const previousCredentials = this.config.accessCredentials.map((credential) => ({
      ...credential,
    }));

    if (this.smartstorageInstance) {
      await this.smartstorageInstance.replaceCredentials(nextCredentials);
    }

    this.config.accessCredentials = nextCredentials;
    try {
      await this.savePersistedAdminConfig();
    } catch (error) {
      this.config.accessCredentials = previousCredentials;
      if (this.smartstorageInstance) {
        await this.smartstorageInstance.replaceCredentials(previousCredentials);
        await this.refreshManagementClient();
      }
      throw error;
    }

    if (this.smartstorageInstance) {
      await this.refreshManagementClient();
    }
  }

  public async listAccessCredentials(): Promise<Array<{ accessKeyId: string }>> {
    if (!this.smartstorageInstance) {
      return this.config.accessCredentials.map((credential) => ({
        accessKeyId: credential.accessKeyId,
      }));
    }
    return await this.smartstorageInstance.listCredentials();
  }

  // ── Management methods ──

  public async listBuckets(): Promise<interfaces.data.IBucketInfo[]> {
    const summaries = await this.smartstorageInstance.listBucketSummaries();
    return summaries.map((bucket) => ({
      name: bucket.name,
      creationDate: bucket.creationDate || 0,
      objectCount: bucket.objectCount,
      totalSizeBytes: bucket.totalSizeBytes,
    }));
  }

  public async createBucket(bucketName: string): Promise<void> {
    await this.smartstorageInstance.createBucket(bucketName);
  }

  public async deleteBucket(bucketName: string): Promise<void> {
    await this.s3Client.send(new plugins.DeleteBucketCommand({ Bucket: bucketName }));
  }

  public async listObjects(
    bucketName: string,
    prefix?: string,
    delimiter?: string,
    maxKeys?: number,
  ): Promise<interfaces.data.IObjectListResult> {
    const response = await this.s3Client.send(
      new plugins.ListObjectsV2Command({
        Bucket: bucketName,
        Prefix: prefix || '',
        Delimiter: delimiter || '/',
        MaxKeys: maxKeys || 1000,
      }),
    );

    const objects: interfaces.data.IObjectInfo[] = (response.Contents || []).map((obj) => ({
      key: obj.Key || '',
      size: obj.Size || 0,
      lastModified: obj.LastModified?.getTime() || 0,
      etag: obj.ETag || '',
      contentType: '',
    }));

    const commonPrefixes = (response.CommonPrefixes || []).map((p) => p.Prefix || '');

    return {
      objects,
      commonPrefixes,
      isTruncated: response.IsTruncated || false,
      currentPrefix: prefix || '',
    };
  }

  public async deleteObject(bucketName: string, key: string): Promise<void> {
    await this.s3Client.send(
      new plugins.DeleteObjectCommand({ Bucket: bucketName, Key: key }),
    );
  }

  public async getObject(bucketName: string, key: string): Promise<{
    content: string;
    contentType: string;
    size: number;
    lastModified: string;
  }> {
    const response = await this.s3Client.send(
      new plugins.GetObjectCommand({ Bucket: bucketName, Key: key }),
    );
    const bodyBytes = await response.Body!.transformToByteArray();
    // Convert to base64
    let binary = '';
    for (const byte of bodyBytes) {
      binary += String.fromCharCode(byte);
    }
    const base64Content = btoa(binary);

    return {
      content: base64Content,
      contentType: response.ContentType || 'application/octet-stream',
      size: response.ContentLength || 0,
      lastModified: response.LastModified?.toISOString() || new Date().toISOString(),
    };
  }

  public async putObject(
    bucketName: string,
    key: string,
    base64Content: string,
    contentType: string,
  ): Promise<void> {
    const binaryString = atob(base64Content);
    const bytes = new Uint8Array(binaryString.length);
    for (let i = 0; i < binaryString.length; i++) {
      bytes[i] = binaryString.charCodeAt(i);
    }
    await this.s3Client.send(
      new plugins.PutObjectCommand({
        Bucket: bucketName,
        Key: key,
        Body: bytes,
        ContentType: contentType,
      }),
    );
  }

  public async deletePrefix(bucketName: string, prefix: string): Promise<void> {
    let continuationToken: string | undefined;
    do {
      const listResp = await this.s3Client.send(
        new plugins.ListObjectsV2Command({
          Bucket: bucketName,
          Prefix: prefix,
          ContinuationToken: continuationToken,
        }),
      );
      for (const obj of listResp.Contents || []) {
        if (obj.Key) {
          await this.s3Client.send(
            new plugins.DeleteObjectCommand({ Bucket: bucketName, Key: obj.Key }),
          );
        }
      }
      continuationToken = listResp.IsTruncated ? listResp.NextContinuationToken : undefined;
    } while (continuationToken);
  }

  public async getObjectUrl(bucketName: string, key: string): Promise<string> {
    const descriptor = await this.smartstorageInstance.getStorageDescriptor();
    return `http://${descriptor.endpoint}:${descriptor.port}/${bucketName}/${key}`;
  }

  public async moveObject(
    bucketName: string,
    sourceKey: string,
    destKey: string,
  ): Promise<{ success: boolean; error?: string }> {
    try {
      await this.s3Client.send(
        new plugins.CopyObjectCommand({
          Bucket: bucketName,
          CopySource: `${bucketName}/${sourceKey}`,
          Key: destKey,
        }),
      );
      await this.s3Client.send(
        new plugins.DeleteObjectCommand({ Bucket: bucketName, Key: sourceKey }),
      );
      return { success: true };
    } catch (err: any) {
      return { success: false, error: err.message };
    }
  }

  public async movePrefix(
    bucketName: string,
    sourcePrefix: string,
    destPrefix: string,
  ): Promise<{ success: boolean; movedCount?: number; error?: string }> {
    try {
      let movedCount = 0;
      let continuationToken: string | undefined;
      do {
        const listResp = await this.s3Client.send(
          new plugins.ListObjectsV2Command({
            Bucket: bucketName,
            Prefix: sourcePrefix,
            ContinuationToken: continuationToken,
          }),
        );
        for (const obj of listResp.Contents || []) {
          if (!obj.Key) continue;
          const newKey = destPrefix + obj.Key.slice(sourcePrefix.length);
          await this.s3Client.send(
            new plugins.CopyObjectCommand({
              Bucket: bucketName,
              CopySource: `${bucketName}/${obj.Key}`,
              Key: newKey,
            }),
          );
          await this.s3Client.send(
            new plugins.DeleteObjectCommand({ Bucket: bucketName, Key: obj.Key }),
          );
          movedCount++;
        }
        continuationToken = listResp.IsTruncated ? listResp.NextContinuationToken : undefined;
      } while (continuationToken);
      return { success: true, movedCount };
    } catch (err: any) {
      return { success: false, error: err.message };
    }
  }

  public async getServerStats(): Promise<interfaces.data.IServerStatus> {
    const stats = await this.smartstorageInstance.getStorageStats();

    return {
      running: true,
      objstPort: this.config.objstPort,
      uiPort: this.config.uiPort,
      uptime: Math.floor((Date.now() - this.startedAt) / 1000),
      startedAt: this.startedAt,
      bucketCount: stats.bucketCount,
      totalObjectCount: stats.totalObjectCount,
      totalStorageBytes: stats.totalStorageBytes,
      storageDirectory: stats.storageDirectory,
      region: this.config.region,
      authEnabled: true,
    };
  }

  public async getClusterHealth(): Promise<interfaces.data.IClusterHealth> {
    return await this.smartstorageInstance.getClusterHealth();
  }

  public async getBucketPolicy(bucketName: string): Promise<string | null> {
    try {
      const response = await this.s3Client.send(
        new plugins.GetBucketPolicyCommand({ Bucket: bucketName }),
      );
      return response.Policy || null;
    } catch (err: any) {
      if (err.name === 'NoSuchBucketPolicy' || err.Code === 'NoSuchBucketPolicy') {
        return null;
      }
      throw err;
    }
  }

  public async putBucketPolicy(bucketName: string, policyJson: string): Promise<void> {
    await this.s3Client.send(
      new plugins.PutBucketPolicyCommand({ Bucket: bucketName, Policy: policyJson }),
    );
  }

  public async deleteBucketPolicy(bucketName: string): Promise<void> {
    await this.s3Client.send(
      new plugins.DeleteBucketPolicyCommand({ Bucket: bucketName }),
    );
  }

  public async getConnectionInfo(): Promise<interfaces.data.IConnectionInfo> {
    const descriptor = await this.smartstorageInstance.getStorageDescriptor();
    return {
      endpoint: descriptor.endpoint,
      port: Number(descriptor.port ?? this.config.objstPort),
      useSsl: descriptor.useSsl ?? false,
      accessKey: descriptor.accessKey,
      region: this.config.region,
    };
  }

  public isReady(): boolean {
    return Boolean(this.smartstorageInstance && this.s3Client && this.startedAt);
  }

  public async getOperationalHealth(): Promise<Record<string, unknown>> {
    const clusterHealth = this.smartstorageInstance
      ? await this.getClusterHealth()
      : { enabled: false };
    const stats = this.smartstorageInstance
      ? await this.getServerStats()
      : null;
    const ready = this.isReady();
    return {
      ok: ready,
      status: ready ? 'healthy' : 'starting',
      startedAt: this.startedAt || null,
      uptimeSeconds: this.startedAt ? Math.floor((Date.now() - this.startedAt) / 1000) : 0,
      storageDirectory: this.config.storageDirectory,
      stats,
      cluster: clusterHealth,
    };
  }

  public async getOperationalMetrics(): Promise<string> {
    const stats = this.smartstorageInstance
      ? await this.smartstorageInstance.getStorageStats()
      : null;
    const clusterHealth = this.smartstorageInstance
      ? await this.smartstorageInstance.getClusterHealth()
      : { enabled: false };
    return [
      '# HELP objectstorage_ready ObjectStorage readiness state.',
      '# TYPE objectstorage_ready gauge',
      `objectstorage_ready ${this.isReady() ? 1 : 0}`,
      '# HELP objectstorage_buckets_total Runtime bucket count.',
      '# TYPE objectstorage_buckets_total gauge',
      `objectstorage_buckets_total ${stats?.bucketCount ?? 0}`,
      '# HELP objectstorage_objects_total Runtime object count.',
      '# TYPE objectstorage_objects_total gauge',
      `objectstorage_objects_total ${stats?.totalObjectCount ?? 0}`,
      '# HELP objectstorage_cluster_enabled Cluster mode enabled.',
      '# TYPE objectstorage_cluster_enabled gauge',
      `objectstorage_cluster_enabled ${clusterHealth.enabled ? 1 : 0}`,
      '',
    ].join('\n');
  }

  private get persistedAdminConfigPath(): string {
    return `${this.config.storageDirectory}/.objectstorage/admin-config.json`;
  }

  private async loadPersistedAdminConfig(): Promise<void> {
    if (this.envAccessCredentialsProvided) {
      return;
    }

    try {
      const content = await Deno.readTextFile(this.persistedAdminConfigPath);
      const persistedConfig = JSON.parse(content) as IPersistedAdminConfig;
      const persistedCredentials = persistedConfig.accessCredentials;

      if (!Array.isArray(persistedCredentials) || persistedCredentials.length === 0) {
        return;
      }

      const validCredentials = persistedCredentials
        .filter((credential) => credential?.accessKeyId && credential?.secretAccessKey)
        .map((credential) => ({
          accessKeyId: credential.accessKeyId,
          secretAccessKey: credential.secretAccessKey,
        }));

      if (validCredentials.length === 0) {
        return;
      }

      this.config.accessCredentials = validCredentials;
    } catch (error) {
      if (error instanceof Deno.errors.NotFound) {
        return;
      }
      throw error;
    }
  }

  private async savePersistedAdminConfig(): Promise<void> {
    const dirPath = this.persistedAdminConfigPath.substring(
      0,
      this.persistedAdminConfigPath.lastIndexOf('/'),
    );
    await Deno.mkdir(dirPath, { recursive: true });
    const persistedConfig: IPersistedAdminConfig = {
      accessCredentials: this.config.accessCredentials,
    };
    await Deno.writeTextFile(
      this.persistedAdminConfigPath,
      JSON.stringify(persistedConfig, null, 2),
      { mode: 0o600 },
    );
    await this.restrictPersistedAdminConfigPermissions();
  }

  private async refreshManagementClient(): Promise<void> {
    const descriptor = await this.smartstorageInstance.getStorageDescriptor();
    this.s3Client = new plugins.S3Client({
      endpoint: `http://${descriptor.endpoint}:${descriptor.port}`,
      region: this.config.region,
      credentials: {
        accessKeyId: descriptor.accessKey,
        secretAccessKey: descriptor.accessSecret,
      },
      forcePathStyle: true,
    });
  }

  private buildSmartstorageConfig(): any {
    const smartstorageConfig: any = {
      server: {
        port: this.config.objstPort,
        address: '0.0.0.0',
        region: this.config.region,
      },
      storage: {
        directory: this.config.storageDirectory,
      },
      auth: {
        enabled: true,
        credentials: this.config.accessCredentials,
      },
    };

    if (this.config.clusterEnabled) {
      smartstorageConfig.cluster = {
        enabled: true,
        nodeId: this.config.clusterNodeId || crypto.randomUUID().slice(0, 8),
        quicPort: this.config.clusterQuicPort,
        seedNodes: this.config.clusterSeedNodes,
        erasure: {
          dataShards: this.config.erasureDataShards,
          parityShards: this.config.erasureParityShards,
          chunkSizeBytes: this.config.erasureChunkSizeBytes,
        },
        drives: {
          paths: this.config.drivePaths.length > 0
            ? this.config.drivePaths
            : [this.config.storageDirectory],
        },
        heartbeatIntervalMs: this.config.clusterHeartbeatIntervalMs,
        heartbeatTimeoutMs: this.config.clusterHeartbeatTimeoutMs,
      };
    }

    return smartstorageConfig;
  }

  private assertSecureStartupConfig(): void {
    const allowInsecureDefaults = Deno.env.get('OBJST_ALLOW_INSECURE_DEFAULTS') === 'true';
    const usesDefaultAdminPassword = this.config.adminPassword === 'admin';
    const usesDefaultAccessCredential = this.config.accessCredentials.some((credential) => {
      return credential.accessKeyId === 'admin' && credential.secretAccessKey === 'admin';
    });
    const looksLikePersistentProductionStorage = this.config.storageDirectory === '/data';

    if (
      looksLikePersistentProductionStorage &&
      !allowInsecureDefaults &&
      (usesDefaultAdminPassword || usesDefaultAccessCredential)
    ) {
      throw new Error(
        'Refusing to start with default admin credentials on persistent /data storage. Set OBJST_ADMIN_PASSWORD and OBJST_ACCESS_KEY/OBJST_SECRET_KEY, or set OBJST_ALLOW_INSECURE_DEFAULTS=true for disposable development.',
      );
    }
  }

  private async restrictPersistedAdminConfigPermissions(): Promise<void> {
    try {
      await Deno.chmod(this.persistedAdminConfigPath, 0o600);
    } catch {
      // chmod is not available on every platform Deno supports.
    }
  }
}
