/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright 2013 Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */

'use strict';

var module = angular.module('xe.datasources', []);


module.service('Breakpoint', function() {
  // http://stackoverflow.com/a/2117523/377392
  var uuidFormat = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
  function uuid4() {
    return uuidFormat.replace(/[xy]/g, function(c) {
      var r = Math.random()*16|0, v = c === 'x' ? r : (r&0x3|0x8);
      return v.toString(16);
    });
  };

  var Breakpoint = function(opt_id) {
    this.id = opt_id || uuid4();
    this.type = Breakpoint.Type.TEMP;
    this.fnAddress = 0;
    this.address = 0;
    this.enabled = true;
  };
  Breakpoint.Type = {
    TEMP: 'temp',
    CODE: 'code'
  };
  Breakpoint.fromJSON = function(json) {
    var breakpoint = new Breakpoint(json.id);
    breakpoint.type = json.type;
    breakpoint.fnAddress = json.fnAddress;
    breakpoint.address = json.address;
    breakpoint.enabled = json.enabled;
    return breakpoint;
  };
  Breakpoint.prototype.toJSON = function() {
    return {
      'id': this.id,
      'type': this.type,
      'fnAddress': this.fnAddress,
      'address': this.address,
      'enabled': this.enabled
    };
  };
  return Breakpoint;
});


module.service('DataSource', function($q) {
  var DataSource = function(source, delegate) {
    EventEmitter.call(this);
    this.source = source;
    this.delegate = delegate;
    this.online = false;
    this.status = 'disconnected';
  };
  inherits(DataSource, EventEmitter);
  DataSource.prototype.open = function() {};
  DataSource.prototype.dispose = function() {};
  DataSource.prototype.issue = function(command) {};

  DataSource.prototype.makeReady = function() {
    return this.issue({
      command: 'debug.make_ready'
    });
  };

  DataSource.prototype.getModuleList = function() {
    return this.issue({
      command: 'cpu.get_module_list'
    });
  };

  DataSource.prototype.getModule = function(moduleName) {
    return this.issue({
      command: 'cpu.get_module',
      module: moduleName
    });
  };

  DataSource.prototype.getFunctionList = function(moduleName, opt_since) {
    return this.issue({
      command: 'cpu.get_function_list',
      module: moduleName,
      since: opt_since || 0
    });
  };

  DataSource.prototype.getFunction = function(address) {
    return this.issue({
      command: 'cpu.get_function',
      address: address
    });
  };

  DataSource.prototype.getThreadStates = function() {
    return this.issue({
      command: 'cpu.get_thread_states'
    });
  };

  // set registers/etc?

  DataSource.prototype.addBreakpoint = function(breakpoint) {
    return this.addBreakpoints([breakpoint]);
  };

  DataSource.prototype.addBreakpoints = function(breakpoints) {
    if (!breakpoints.length) {
      var d = $q.defer();
      d.resolve();
      return d.promise;
    }
    return this.issue({
      command: 'cpu.add_breakpoints',
      breakpoints: breakpoints.map(function(breakpoint) {
        return breakpoint.toJSON();
      })
    });
  };

  DataSource.prototype.removeBreakpoint = function(breakpointId) {
    return this.removeBreakpoints([breakpointId]);
  };

  DataSource.prototype.removeBreakpoints = function(breakpointIds) {
    return this.issue({
      command: 'cpu.remove_breakpoints',
      breakpointIds: breakpointIds
    });
  };

  DataSource.prototype.removeAllBreakpoints = function() {
    return this.issue({
      command: 'cpu.remove_all_breakpoints'
    });
  };

  DataSource.prototype.continueExecution = function() {
    return this.issue({
      command: 'cpu.continue'
    });
  };

  DataSource.prototype.breakExecution = function() {
    return this.issue({
      command: 'cpu.break'
    });
  };

  DataSource.prototype.stepNext = function(threadId) {
    return this.issue({
      command: 'cpu.step',
      threadId: threadId
    });
  };

  return DataSource;
});

module.service('RemoteDataSource', function(
    $rootScope, $q, log, DataSource) {
  var RemoteDataSource = function(url, delegate) {
    DataSource.call(this, url, delegate);
    this.url = url;
    this.socket = null;
    this.nextRequestId_ = 1;
    this.pendingRequests_ = {};
  };
  inherits(RemoteDataSource, DataSource);

  RemoteDataSource.prototype.open = function() {
    var url = this.url;

    this.online = false;
    this.status = 'connecting';

    var d = $q.defer();

    this.socket = new WebSocket(url, []);
    this.socket.onopen = (function() {
      $rootScope.$apply((function() {
        // TODO(benvanik): handshake

        this.online = true;
        this.status = 'connected';
        this.emit('online');
        d.resolve();
      }).bind(this));
    }).bind(this);

    this.socket.onclose = (function(e) {
      $rootScope.$apply((function() {
        this.online = false;
        if (this.status == 'connecting') {
          this.status = 'disconnected';
          d.reject(e.code + ' ' + e.reason);
        } else {
          this.status = 'disconnected';
          log.info('Disconnected');
          this.emit('offline');
        }
      }).bind(this));
    }).bind(this);

    this.socket.onerror = (function(e) {
      // ?
    }).bind(this);

    this.socket.onmessage = (function(e) {
      $rootScope.$apply((function() {
        this.socketMessage(e);
      }).bind(this));
    }).bind(this);

    return d.promise;
  };

  RemoteDataSource.prototype.socketMessage = function(e) {
    console.log('message', e.data);
    var json = JSON.parse(e.data);
    if (json.requestId) {
      // Response to a previous request.
      var request = this.pendingRequests_[json.requestId];
      if (request) {
        delete this.pendingRequests_[json.requestId];
        if (json.status) {
          request.deferred.resolve(json.result);
        } else {
          request.deferred.reject(json.result);
        }
      }
    } else {
      // Notification.
      switch (json.type) {
      case 'breakpoint':
        this.delegate.onBreakpointHit(
            json.breakpointId, json.threadId);
        break;
      default:
        log.error('Unknown notification type: ' + json.type);
        break;
      }
    }
  };

  RemoteDataSource.prototype.dispose = function() {
    this.pendingRequests_ = {};
    this.online = false;
    this.status = 'disconnected';
    if (this.socket) {
      this.socket.close();
      this.socket = null;
    }
    DataSource.prototype.dispose.call(this);
  };

  RemoteDataSource.prototype.issue = function(command) {
    var d = $q.defer();
    command.requestId = this.nextRequestId_++;
    this.socket.send(JSON.stringify(command));
    command.deferred = d;
    this.pendingRequests_[command.requestId] = command;
    return d.promise;
  };

  return RemoteDataSource;
});


module.service('FileDataSource', function($q, DataSource) {
  var FileDataSource = function(file, delegate) {
    DataSource.call(this, file.name, delegate);
    this.file = file;
  };
  inherits(FileDataSource, DataSource);

  FileDataSource.prototype.open = function() {
    this.status = 'connecting';

    var d = $q.defer();

    var self = this;
    window.setTimeout(function() {
      $scope.$apply((function() {
        // TODO(benvanik): scan/load trace

        this.online = true;
        this.status = 'connected';
        d.resolve();
      }).bind(self));
    });

    return d.promise;
  };

  FileDataSource.prototype.dispose = function() {
    this.online = false;
    if (this.file) {
      if (this.file.close) {
        this.file.close();
      }
      this.file = null;
    }
    DataSource.prototype.dispose.call(this);
  };

  return FileDataSource;
});