/*!
 * Should
 * Copyright(c) 2010-2014 TJ Holowaychuk <tj@vision-media.ca>
 * MIT Licensed
 */

var util = require('../util'),
  eql = require('../eql');

var aSlice = Array.prototype.slice;

module.exports = function(should, Assertion) {
  var i = should.format;

  Assertion.add('property', function(name, val) {
    if(arguments.length > 1) {
      var p = {};
      p[name] = val;
      this.have.properties(p);
    } else {
      this.have.properties(name);
    }
    this.obj = this.obj[name];
  });

  Assertion.add('properties', function(names) {
    var values = {};
    if(arguments.length > 1) {
      names = aSlice.call(arguments);
    } else if(!Array.isArray(names)) {
      if(util.isString(names)) {
        names = [names];
      } else {
        values = names;
        names = Object.keys(names);
      }
    }

    var obj = Object(this.obj), missingProperties = [];

    //just enumerate properties and check if they all present
    names.forEach(function(name) {
      if(!(name in obj)) missingProperties.push(i(name));
    });

    var props = missingProperties;
    if(props.length === 0) {
      props = names.map(i);
    }

    var operator = (props.length === 1 ?
      'to have property ' : 'to have properties ') + props.join(', ');

    this.params = { operator: operator };

    this.assert(missingProperties.length === 0);

    // check if values in object matched expected
    var valueCheckNames = Object.keys(values);
    if(valueCheckNames.length) {
      var wrongValues = [];
      props = [];

      // now check values, as there we have all properties
      valueCheckNames.forEach(function(name) {
        var value = values[name];
        if(!eql(obj[name], value)) {
          wrongValues.push(i(name) + ' of ' + i(value) + ' (got ' + i(obj[name]) + ')');
        } else {
          props.push(i(name) + ' of ' + i(value));
        }
      });

      if(wrongValues.length > 0) {
        props = wrongValues;
      }

      operator = (props.length === 1 ?
        'to have property ' : 'to have properties ') + props.join(', ');

      this.params = { operator: operator };

      this.assert(wrongValues.length === 0);
    }
  });

  Assertion.add('length', function(n, description) {
    this.have.property('length', n, description);
  });

  Assertion.alias('length', 'lengthOf');

  var hasOwnProperty = Object.prototype.hasOwnProperty;

  Assertion.add('ownProperty', function(name, description) {
    this.params = { operator: 'to have own property ' + i(name), message: description };

    this.assert(hasOwnProperty.call(this.obj, name));

    this.obj = this.obj[name];
  });

  Assertion.alias('hasOwnProperty', 'ownProperty');

  Assertion.add('empty', function() {
    this.params = { operator: 'to be empty' };

    if(util.isString(this.obj) || Array.isArray(this.obj) || util.isArguments(this.obj)) {
      this.have.property('length', 0);
    } else {
      var obj = Object(this.obj); // wrap to reference for booleans and numbers
      for(var prop in obj) {
        this.have.not.ownProperty(prop);
      }
    }
  }, true);

  Assertion.add('keys', function(keys) {
    if(arguments.length > 1) keys = aSlice.call(arguments);
    else if(arguments.length === 1 && util.isString(keys)) keys = [ keys ];
    else if(arguments.length === 0) keys = [];

    var obj = Object(this.obj);

    // first check if some keys are missing
    var missingKeys = [];
    keys.forEach(function(key) {
      if(!hasOwnProperty.call(this.obj, key))
        missingKeys.push(i(key));
    }, this);

    // second check for extra keys
    var extraKeys = [];
    Object.keys(obj).forEach(function(key) {
      if(keys.indexOf(key) < 0) {
        extraKeys.push(i(key));
      }
    });

    var verb = keys.length === 0 ? 'to be empty' :
      'to have ' + (keys.length === 1 ? 'key ' : 'keys ');

    this.params = { operator: verb + keys.map(i).join(', ')};

    if(missingKeys.length > 0)
      this.params.operator += '\n\tmissing keys: ' + missingKeys.join(', ');

    if(extraKeys.length > 0)
      this.params.operator += '\n\textra keys: ' + extraKeys.join(', ');

    this.assert(missingKeys.length === 0 && extraKeys.length === 0);
  });

  Assertion.alias("keys", "key");

  Assertion.add('containEql', function(other) {
    this.params = { operator: 'to contain ' + i(other) };
    var obj = this.obj;
    if(Array.isArray(obj)) {
      this.assert(obj.some(function(item) {
        return eql(item, other);
      }));
    } else if(util.isString(obj)) {
      // expect obj to be string
      this.assert(obj.indexOf(String(other)) >= 0);
    } else if(util.isObject(obj)) {
      // object contains object case
      util.forOwn(other, function(value, key) {
        obj[key].should.eql(value);
      });
    } else {
      //other uncovered cases
      this.assert(false);
    }
  });

  Assertion.add('containDeep', function(other) {
    this.params = { operator: 'to contain ' + i(other) };

    var obj = this.obj;
    if(Array.isArray(obj)) {
      if(Array.isArray(other)) {
        var otherIdx = 0;
        obj.forEach(function(item) {
          try {
            should(item).not.be.null.and.containDeep(other[otherIdx]);
            otherIdx++;
          } catch(e) {
            if(e instanceof should.AssertionError) {
              return;
            }
            throw e;
          }
        });
        this.assert(otherIdx == other.length);
        //search array contain other as sub sequence
      } else {
        this.assert(false);
      }
    } else if(util.isString(obj)) {// expect other to be string
      this.assert(obj.indexOf(String(other)) >= 0);
    } else if(util.isObject(obj)) {// object contains object case
      if(util.isObject(other)) {
        util.forOwn(other, function(value, key) {
          should(obj[key]).not.be.null.and.containDeep(value);
        });
      } else {//one of the properties contain value
        this.assert(false);
      }
    } else {
      this.eql(other);
    }
  });

};