import { ReactiveCache } from '/imports/reactiveCache';
import { Meteor } from 'meteor/meteor';
import { SimpleSchema } from 'meteor/aldeed:simple-schema';
import { STORAGE_NAME_FILESYSTEM, STORAGE_NAME_GRIDFS, STORAGE_NAME_S3 } from '/models/lib/fileStoreStrategy';

// Attachment Storage Settings Collection
AttachmentStorageSettings = new Mongo.Collection('attachmentStorageSettings');

// Schema for attachment storage settings
AttachmentStorageSettings.attachSchema(
  new SimpleSchema({
    // Default storage backend for new uploads
    defaultStorage: {
      type: String,
      allowedValues: [STORAGE_NAME_FILESYSTEM, STORAGE_NAME_GRIDFS, STORAGE_NAME_S3],
      defaultValue: STORAGE_NAME_FILESYSTEM,
      label: 'Default Storage Backend'
    },
    
    // Storage backend configuration
    storageConfig: {
      type: Object,
      optional: true,
      label: 'Storage Configuration'
    },
    
    'storageConfig.filesystem': {
      type: Object,
      optional: true,
      label: 'Filesystem Configuration'
    },
    
    'storageConfig.filesystem.enabled': {
      type: Boolean,
      defaultValue: true,
      label: 'Filesystem Storage Enabled'
    },
    
    'storageConfig.filesystem.path': {
      type: String,
      optional: true,
      label: 'Filesystem Storage Path'
    },
    
    'storageConfig.gridfs': {
      type: Object,
      optional: true,
      label: 'GridFS Configuration'
    },
    
    'storageConfig.gridfs.enabled': {
      type: Boolean,
      defaultValue: true,
      label: 'GridFS Storage Enabled'
    },
    
    'storageConfig.s3': {
      type: Object,
      optional: true,
      label: 'S3 Configuration'
    },
    
    'storageConfig.s3.enabled': {
      type: Boolean,
      defaultValue: false,
      label: 'S3 Storage Enabled'
    },
    
    'storageConfig.s3.endpoint': {
      type: String,
      optional: true,
      label: 'S3 Endpoint'
    },
    
    'storageConfig.s3.bucket': {
      type: String,
      optional: true,
      label: 'S3 Bucket'
    },
    
    'storageConfig.s3.region': {
      type: String,
      optional: true,
      label: 'S3 Region'
    },
    
    'storageConfig.s3.sslEnabled': {
      type: Boolean,
      defaultValue: true,
      label: 'S3 SSL Enabled'
    },
    
    'storageConfig.s3.port': {
      type: Number,
      defaultValue: 443,
      label: 'S3 Port'
    },
    
    // Upload settings
    uploadSettings: {
      type: Object,
      optional: true,
      label: 'Upload Settings'
    },
    
    'uploadSettings.maxFileSize': {
      type: Number,
      optional: true,
      label: 'Maximum File Size (bytes)'
    },
    
    'uploadSettings.allowedMimeTypes': {
      type: Array,
      optional: true,
      label: 'Allowed MIME Types'
    },
    
    'uploadSettings.allowedMimeTypes.$': {
      type: String,
      label: 'MIME Type'
    },
    
    // Migration settings
    migrationSettings: {
      type: Object,
      optional: true,
      label: 'Migration Settings'
    },
    
    'migrationSettings.autoMigrate': {
      type: Boolean,
      defaultValue: false,
      label: 'Auto Migrate to Default Storage'
    },
    
    'migrationSettings.batchSize': {
      type: Number,
      defaultValue: 10,
      min: 1,
      max: 100,
      label: 'Migration Batch Size'
    },
    
    'migrationSettings.delayMs': {
      type: Number,
      defaultValue: 1000,
      min: 100,
      max: 10000,
      label: 'Migration Delay (ms)'
    },
    
    'migrationSettings.cpuThreshold': {
      type: Number,
      defaultValue: 70,
      min: 10,
      max: 90,
      label: 'CPU Threshold (%)'
    },
    
    // Metadata
    createdAt: {
      type: Date,
      autoValue() {
        if (this.isInsert) {
          return new Date();
        } else if (this.isUpsert) {
          return { $setOnInsert: new Date() };
        } else {
          this.unset();
        }
      },
      label: 'Created At'
    },
    
    updatedAt: {
      type: Date,
      autoValue() {
        if (this.isUpdate || this.isUpsert) {
          return new Date();
        }
      },
      label: 'Updated At'
    },
    
    createdBy: {
      type: String,
      optional: true,
      label: 'Created By'
    },
    
    updatedBy: {
      type: String,
      optional: true,
      label: 'Updated By'
    }
  })
);

// Helper methods
AttachmentStorageSettings.helpers({
  // Get default storage backend
  getDefaultStorage() {
    return this.defaultStorage || STORAGE_NAME_FILESYSTEM;
  },
  
  // Check if storage backend is enabled
  isStorageEnabled(storageName) {
    if (!this.storageConfig) return false;
    
    switch (storageName) {
      case STORAGE_NAME_FILESYSTEM:
        return this.storageConfig.filesystem?.enabled !== false;
      case STORAGE_NAME_GRIDFS:
        return this.storageConfig.gridfs?.enabled !== false;
      case STORAGE_NAME_S3:
        return this.storageConfig.s3?.enabled === true;
      default:
        return false;
    }
  },
  
  // Get storage configuration
  getStorageConfig(storageName) {
    if (!this.storageConfig) return null;
    
    switch (storageName) {
      case STORAGE_NAME_FILESYSTEM:
        return this.storageConfig.filesystem;
      case STORAGE_NAME_GRIDFS:
        return this.storageConfig.gridfs;
      case STORAGE_NAME_S3:
        return this.storageConfig.s3;
      default:
        return null;
    }
  },
  
  // Get upload settings
  getUploadSettings() {
    return this.uploadSettings || {};
  },
  
  // Get migration settings
  getMigrationSettings() {
    return this.migrationSettings || {};
  }
});

// Server-side methods
if (Meteor.isServer) {
  // Get or create default settings
  Meteor.methods({
    'getAttachmentStorageSettings'() {
      if (!this.userId) {
        throw new Meteor.Error('not-authorized', 'Must be logged in');
      }

      const user = ReactiveCache.getUser(this.userId);
      if (!user || !user.isAdmin) {
        throw new Meteor.Error('not-authorized', 'Admin access required');
      }

      let settings = AttachmentStorageSettings.findOne({});
      
      if (!settings) {
        // Create default settings
        settings = {
          defaultStorage: STORAGE_NAME_FILESYSTEM,
          storageConfig: {
            filesystem: {
              enabled: true,
              path: process.env.WRITABLE_PATH ? `${process.env.WRITABLE_PATH}/attachments` : '/data/attachments'
            },
            gridfs: {
              enabled: true
            },
            s3: {
              enabled: false
            }
          },
          uploadSettings: {
            maxFileSize: process.env.ATTACHMENTS_UPLOAD_MAX_SIZE ? parseInt(process.env.ATTACHMENTS_UPLOAD_MAX_SIZE) : 0,
            allowedMimeTypes: process.env.ATTACHMENTS_UPLOAD_MIME_TYPES ? process.env.ATTACHMENTS_UPLOAD_MIME_TYPES.split(',').map(t => t.trim()) : []
          },
          migrationSettings: {
            autoMigrate: false,
            batchSize: 10,
            delayMs: 1000,
            cpuThreshold: 70
          },
          createdBy: this.userId,
          updatedBy: this.userId
        };
        
        AttachmentStorageSettings.insert(settings);
        settings = AttachmentStorageSettings.findOne({});
      }
      
      return settings;
    },
    
    'updateAttachmentStorageSettings'(settings) {
      if (!this.userId) {
        throw new Meteor.Error('not-authorized', 'Must be logged in');
      }

      const user = ReactiveCache.getUser(this.userId);
      if (!user || !user.isAdmin) {
        throw new Meteor.Error('not-authorized', 'Admin access required');
      }

      // Validate settings
      const schema = AttachmentStorageSettings.simpleSchema();
      schema.validate(settings);
      
      // Update settings
      const result = AttachmentStorageSettings.upsert(
        {},
        {
          $set: {
            ...settings,
            updatedBy: this.userId,
            updatedAt: new Date()
          }
        }
      );
      
      return result;
    },
    
    'getDefaultAttachmentStorage'() {
      if (!this.userId) {
        throw new Meteor.Error('not-authorized', 'Must be logged in');
      }

      const settings = AttachmentStorageSettings.findOne({});
      return settings ? settings.getDefaultStorage() : STORAGE_NAME_FILESYSTEM;
    },
    
    'setDefaultAttachmentStorage'(storageName) {
      if (!this.userId) {
        throw new Meteor.Error('not-authorized', 'Must be logged in');
      }

      const user = ReactiveCache.getUser(this.userId);
      if (!user || !user.isAdmin) {
        throw new Meteor.Error('not-authorized', 'Admin access required');
      }

      if (![STORAGE_NAME_FILESYSTEM, STORAGE_NAME_GRIDFS, STORAGE_NAME_S3].includes(storageName)) {
        throw new Meteor.Error('invalid-storage', 'Invalid storage backend');
      }

      const result = AttachmentStorageSettings.upsert(
        {},
        {
          $set: {
            defaultStorage: storageName,
            updatedBy: this.userId,
            updatedAt: new Date()
          }
        }
      );
      
      return result;
    }
  });

  // Publication for settings
  Meteor.publish('attachmentStorageSettings', function() {
    if (!this.userId) {
      return this.ready();
    }

    const user = ReactiveCache.getUser(this.userId);
    if (!user || !user.isAdmin) {
      return this.ready();
    }

    return AttachmentStorageSettings.find({});
  });
}

export default AttachmentStorageSettings;