Advanced Operations

/**
 * Generic operation dispatch on fulfilled value
 * @param op - Operation name to dispatch
 * @param args - Arguments for the operation
 * @returns Promise for operation result
 */
promise.dispatch(op, args);

/**
 * Low-level dispatch without promise wrapping
 * @param resolve - Resolver function for the result
 * @param op - Operation name to dispatch
 * @param args - Arguments for the operation
 * @returns void (calls resolve with result)
 */
promise.rawDispatch(resolve, op, args);

/**
 * Generic operation dispatch on values (deprecated)
 * @param value - Value to operate on
 * @param op - Operation name
 * @param operands - Operation arguments
 * @returns Promise for operation result
 */
function Q.dispatch(value, op, operands);

const Q = require("q");

// Custom dispatch operations
const objectPromise = Q.resolve({
  values: [1, 2, 3, 4, 5],
  transform: function(fn) { return this.values.map(fn); },
  sum: function() { return this.values.reduce((a, b) => a + b, 0); }
});

// Dispatch custom operations
objectPromise.dispatch("transform", [x => x * 2])
  .then(doubled => console.log("Doubled:", doubled)); // [2, 4, 6, 8, 10]

objectPromise.dispatch("sum", [])
  .then(sum => console.log("Sum:", sum)); // 15

// Raw dispatch for performance-critical operations
function performRawOperation(promise, operation, args) {
  return new Q.Promise((resolve, reject) => {
    promise.rawDispatch((result) => {
      try {
        const operationResult = result[operation].apply(result, args);
        resolve(operationResult);
      } catch (error) {
        reject(error);
      }
    }, operation, args);
  });
}

// Using Q.dispatch (deprecated but still functional)
Q.dispatch({ name: "John" }, "get", ["name"])
  .then(name => console.log("Name:", name));

// Advanced dispatch patterns
class PromiseDispatcher {
  constructor(promise) {
    this.promise = promise;
  }
  
  dispatchOperation(op, ...args) {
    return this.promise.dispatch(op, args);
  }
  
  dispatchMultiple(operations) {
    const dispatches = operations.map(({ op, args }) => 
      this.promise.dispatch(op, args)
    );
    return Q.all(dispatches);
  }
}

// Usage
const dispatcher = new PromiseDispatcher(objectPromise);
dispatcher.dispatchMultiple([
  { op: "sum", args: [] },
  { op: "transform", args: [x => x + 1] }
]).then(results => {
  console.log("Dispatch results:", results);
});

/**
 * Marks value for pass-by-copy semantics
 * @param value - Value to mark for pass-by-copy
 * @returns Value marked for pass-by-copy
 */
function Q.passByCopy(value);
// Alias: Q.push(value)

/**
 * Checks if value is marked for pass-by-copy
 * @param value - Value to check
 * @returns True if value is marked for pass-by-copy
 */
function Q.isPortable(value);

/**
 * Marks promise for pass-by-copy semantics
 * @returns Promise marked for pass-by-copy
 */
promise.pass();

/**
 * Checks if promise is marked for pass-by-copy
 * @returns True if promise is marked for pass-by-copy
 */
promise.toBePassed();

/**
 * Creates pass-by-copy snapshot of fulfilled object
 * @returns Promise for serializable snapshot
 */
promise.pull();

const Q = require("q");

// Mark values for pass-by-copy
const portableData = Q.passByCopy({
  name: "John",
  age: 30,
  preferences: { theme: "dark" }
});

console.log(Q.isPortable(portableData)); // true

// Mark promises for pass-by-copy
const userPromise = fetchUser(123).pass();

console.log(userPromise.toBePassed()); // true

// Create serializable snapshots
const complexObjectPromise = Q.resolve({
  id: 1,
  data: new Map([["key1", "value1"], ["key2", "value2"]]),
  timestamp: new Date(),
  process: () => "cannot be serialized"
});

complexObjectPromise.pull()
  .then(snapshot => {
    console.log("Serializable snapshot:", snapshot);
    // Contains only serializable properties
  });

// Distributed computing example
function createDistributableTask(data) {
  const portableData = Q.passByCopy(data);
  
  return Q.resolve(portableData)
    .pass() // Mark promise as portable
    .then(data => {
      // This promise can be serialized and sent to remote workers
      return processOnRemoteWorker(data);
    });
}

// Serialization utility
function serializePromiseChain(promise) {
  if (promise.toBePassed()) {
    return promise.pull().then(data => ({
      type: "serialized_promise",
      data: JSON.stringify(data),
      portable: true
    }));
  } else {
    throw new Error("Promise is not marked for serialization");
  }
}

// Remote execution pattern
function executeRemoteley(localPromise) {
  return localPromise
    .pass()
    .pull()
    .then(serializableData => {
      return sendToRemoteWorker(serializableData);
    })
    .then(remoteResult => {
      return Q.passByCopy(remoteResult);
    });
}

/**
 * Observes changes to completion time estimates
 * @param emit - Callback for estimate changes
 * @returns Promise with estimate observation
 */
promise.observeEstimate(emit);

/**
 * Gets current completion time estimate
 * @returns Current estimate in milliseconds
 */
promise.getEstimate();

/**
 * Sets completion time estimate on deferred
 * @param estimate - Estimate in milliseconds
 * @returns void
 */
deferred.setEstimate(estimate);

const Q = require("q");

// Set estimates on deferred objects
const deferred = Q.defer();
deferred.setEstimate(5000); // Estimate 5 seconds

// Monitor estimate changes
deferred.promise.observeEstimate((estimate) => {
  console.log(`Estimated completion in: ${estimate}ms`);
});

// Simulate work with estimate updates
setTimeout(() => {
  deferred.setEstimate(3000); // Update to 3 seconds
}, 1000);

setTimeout(() => {
  deferred.setEstimate(1000); // Update to 1 second
}, 2000);

setTimeout(() => {
  deferred.resolve("Task completed");
}, 3000);

// Get current estimates
console.log("Initial estimate:", deferred.promise.getEstimate());

// Progress tracking utility
class ProgressTracker {
  constructor(promise, name) {
    this.promise = promise;
    this.name = name;
    this.startTime = Date.now();
    
    this.setupEstimateObserver();
  }
  
  setupEstimateObserver() {
    this.promise.observeEstimate((estimate) => {
      const elapsed = Date.now() - this.startTime;
      const remaining = Math.max(0, estimate - elapsed);
      
      console.log(`${this.name}: ${remaining}ms remaining (${elapsed}ms elapsed)`);
      
      if (remaining > 0) {
        const percentage = (elapsed / estimate) * 100;
        this.updateProgressBar(Math.min(100, percentage));
      }
    });
  }
  
  updateProgressBar(percentage) {
    const bar = "█".repeat(Math.floor(percentage / 5)) + 
                "░".repeat(20 - Math.floor(percentage / 5));
    console.log(`${this.name}: [${bar}] ${percentage.toFixed(1)}%`);
  }
}

// Usage
function longRunningTask() {
  const deferred = Q.defer();
  deferred.setEstimate(10000); // 10 seconds
  
  let progress = 0;
  const timer = setInterval(() => {
    progress += 1000;
    deferred.setEstimate(10000 - progress);
    
    if (progress >= 10000) {
      clearInterval(timer);
      deferred.resolve("Task completed");
    }
  }, 1000);
  
  return deferred.promise;
}

const tracker = new ProgressTracker(longRunningTask(), "Data Processing");

/**
 * Creates iterator for fulfilled iterable value
 * @returns Promise for iterator object
 */
promise.iterate();

const Q = require("q");

// Create iterator from promised array
const arrayPromise = Q.resolve([1, 2, 3, 4, 5]);

arrayPromise.iterate()
  .then(iterator => {
    console.log(iterator.next()); // { value: 1, done: false }
    console.log(iterator.next()); // { value: 2, done: false }
    console.log(iterator.next()); // { value: 3, done: false }
  });

// Async iteration utility
function asyncIterate(iterablePromise, processor) {
  return iterablePromise.iterate().then(iterator => {
    const results = [];
    
    function processNext() {
      const { value, done } = iterator.next();
      
      if (done) {
        return results;
      }
      
      return Q.resolve(processor(value))
        .then(processedValue => {
          results.push(processedValue);
          return processNext();
        });
    }
    
    return processNext();
  });
}

// Usage
const numbersPromise = Q.resolve([1, 2, 3, 4, 5]);

asyncIterate(numbersPromise, num => Q.delay(num * 2, 100))
  .then(results => console.log("Processed results:", results));

// Stream processing with iterators
function streamProcess(dataPromise, batchSize = 3) {
  return dataPromise.iterate().then(iterator => {
    const batches = [];
    let currentBatch = [];
    
    function processBatch() {
      const { value, done } = iterator.next();
      
      if (done) {
        if (currentBatch.length > 0) {
          batches.push(currentBatch);
        }
        return batches;
      }
      
      currentBatch.push(value);
      
      if (currentBatch.length >= batchSize) {
        batches.push(currentBatch);
        currentBatch = [];
      }
      
      return processBatch();
    }
    
    return processBatch();
  });
}

// Usage
const largeDatasetPromise = Q.resolve(Array.from({ length: 10 }, (_, i) => i + 1));

streamProcess(largeDatasetPromise, 3)
  .then(batches => {
    console.log("Processed in batches:", batches);
    // [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]
  });