import { FieldEncryption } from "./encryption.js";
import { EncryptionKeyManager } from "./encryption-key-manager.js";
import { databaseLogger } from "./logger.js";

interface EncryptionContext {
  masterPassword: string;
  encryptionEnabled: boolean;
  forceEncryption: boolean;
  migrateOnAccess: boolean;
}

class DatabaseEncryption {
  private static context: EncryptionContext | null = null;

  static async initialize(config: Partial<EncryptionContext> = {}) {
    const keyManager = EncryptionKeyManager.getInstance();
    const masterPassword =
      config.masterPassword || (await keyManager.initializeKey());

    this.context = {
      masterPassword,
      encryptionEnabled: config.encryptionEnabled ?? true,
      forceEncryption: config.forceEncryption ?? false,
      migrateOnAccess: config.migrateOnAccess ?? true,
    };

    databaseLogger.info("Database encryption initialized", {
      operation: "encryption_init",
      enabled: this.context.encryptionEnabled,
      forceEncryption: this.context.forceEncryption,
      dynamicKey: !config.masterPassword,
    });
  }

  static getContext(): EncryptionContext {
    if (!this.context) {
      throw new Error(
        "DatabaseEncryption not initialized. Call initialize() first.",
      );
    }
    return this.context;
  }

  static encryptRecord(tableName: string, record: any): any {
    const context = this.getContext();
    if (!context.encryptionEnabled) return record;

    const encryptedRecord = { ...record };
    let hasEncryption = false;

    for (const [fieldName, value] of Object.entries(record)) {
      if (FieldEncryption.shouldEncryptField(tableName, fieldName) && value) {
        try {
          const fieldKey = FieldEncryption.getFieldKey(
            context.masterPassword,
            `${tableName}.${fieldName}`,
          );
          encryptedRecord[fieldName] = FieldEncryption.encryptField(
            value as string,
            fieldKey,
          );
          hasEncryption = true;
        } catch (error) {
          databaseLogger.error(
            `Failed to encrypt field ${tableName}.${fieldName}`,
            error,
            {
              operation: "field_encryption",
              table: tableName,
              field: fieldName,
            },
          );
          throw error;
        }
      }
    }

    if (hasEncryption) {
      databaseLogger.debug(`Encrypted sensitive fields for ${tableName}`, {
        operation: "record_encryption",
        table: tableName,
      });
    }

    return encryptedRecord;
  }

  static decryptRecord(tableName: string, record: any): any {
    const context = this.getContext();
    if (!record) return record;

    const decryptedRecord = { ...record };
    let hasDecryption = false;
    let needsMigration = false;

    for (const [fieldName, value] of Object.entries(record)) {
      if (FieldEncryption.shouldEncryptField(tableName, fieldName) && value) {
        try {
          const fieldKey = FieldEncryption.getFieldKey(
            context.masterPassword,
            `${tableName}.${fieldName}`,
          );

          if (FieldEncryption.isEncrypted(value as string)) {
            decryptedRecord[fieldName] = FieldEncryption.decryptField(
              value as string,
              fieldKey,
            );
            hasDecryption = true;
          } else if (context.encryptionEnabled && !context.forceEncryption) {
            decryptedRecord[fieldName] = value;
            needsMigration = context.migrateOnAccess;
          } else if (context.forceEncryption) {
            databaseLogger.warn(
              `Unencrypted field detected in force encryption mode`,
              {
                operation: "decryption_warning",
                table: tableName,
                field: fieldName,
              },
            );
            decryptedRecord[fieldName] = value;
          }
        } catch (error) {
          databaseLogger.error(
            `Failed to decrypt field ${tableName}.${fieldName}`,
            error,
            {
              operation: "field_decryption",
              table: tableName,
              field: fieldName,
            },
          );

          if (context.forceEncryption) {
            throw error;
          } else {
            decryptedRecord[fieldName] = value;
          }
        }
      }
    }

    if (needsMigration) {
      this.scheduleFieldMigration(tableName, record);
    }

    return decryptedRecord;
  }

  static decryptRecords(tableName: string, records: any[]): any[] {
    if (!Array.isArray(records)) return records;
    return records.map((record) => this.decryptRecord(tableName, record));
  }

  private static scheduleFieldMigration(tableName: string, record: any) {
    setTimeout(async () => {
      try {
        await this.migrateRecord(tableName, record);
      } catch (error) {
        databaseLogger.error(
          `Failed to migrate record ${tableName}:${record.id}`,
          error,
          {
            operation: "migration_failed",
            table: tableName,
            recordId: record.id,
          },
        );
      }
    }, 1000);
  }

  static async migrateRecord(tableName: string, record: any): Promise<any> {
    const context = this.getContext();
    if (!context.encryptionEnabled || !context.migrateOnAccess) return record;

    let needsUpdate = false;
    const updatedRecord = { ...record };

    for (const [fieldName, value] of Object.entries(record)) {
      if (
        FieldEncryption.shouldEncryptField(tableName, fieldName) &&
        value &&
        !FieldEncryption.isEncrypted(value as string)
      ) {
        try {
          const fieldKey = FieldEncryption.getFieldKey(
            context.masterPassword,
            `${tableName}.${fieldName}`,
          );
          updatedRecord[fieldName] = FieldEncryption.encryptField(
            value as string,
            fieldKey,
          );
          needsUpdate = true;
        } catch (error) {
          databaseLogger.error(
            `Failed to migrate field ${tableName}.${fieldName}`,
            error,
            {
              operation: "field_migration",
              table: tableName,
              field: fieldName,
              recordId: record.id,
            },
          );
          throw error;
        }
      }
    }

    return updatedRecord;
  }

  static validateConfiguration(): boolean {
    try {
      const context = this.getContext();
      const testData = "test-encryption-data";
      const testKey = FieldEncryption.getFieldKey(
        context.masterPassword,
        "test",
      );

      const encrypted = FieldEncryption.encryptField(testData, testKey);
      const decrypted = FieldEncryption.decryptField(encrypted, testKey);

      return decrypted === testData;
    } catch (error) {
      databaseLogger.error(
        "Encryption configuration validation failed",
        error,
        {
          operation: "config_validation",
        },
      );
      return false;
    }
  }

  static getEncryptionStatus() {
    try {
      const context = this.getContext();
      return {
        enabled: context.encryptionEnabled,
        forceEncryption: context.forceEncryption,
        migrateOnAccess: context.migrateOnAccess,
        configValid: this.validateConfiguration(),
      };
    } catch {
      return {
        enabled: false,
        forceEncryption: false,
        migrateOnAccess: false,
        configValid: false,
      };
    }
  }

  static async getDetailedStatus() {
    const keyManager = EncryptionKeyManager.getInstance();
    const keyStatus = await keyManager.getEncryptionStatus();
    const encryptionStatus = this.getEncryptionStatus();

    return {
      ...encryptionStatus,
      key: keyStatus,
      initialized: this.context !== null,
    };
  }

  static async reinitializeWithNewKey(): Promise<void> {
    const keyManager = EncryptionKeyManager.getInstance();
    const newKey = await keyManager.regenerateKey();

    this.context = null;
    await this.initialize({ masterPassword: newKey });

    databaseLogger.warn("Database encryption reinitialized with new key", {
      operation: "encryption_reinit",
      requiresMigration: true,
    });
  }
}

export { DatabaseEncryption };
export type { EncryptionContext };