'use strict';

var uri = require('url');

var ValidationError = exports.ValidationError = function ValidationError (message, instance, schema, propertyPath, name, argument) {
  if (propertyPath) {
    this.property = propertyPath;
  }
  if (message) {
    this.message = message;
  }
  if (schema) {
    if (schema.id) {
      this.schema = schema.id;
    } else {
      this.schema = schema;
    }
  }
  if (instance) {
    this.instance = instance;
  }
  this.name = name;
  this.argument = argument;
  this.stack = this.toString();
};

ValidationError.prototype.toString = function toString() {
  return this.property + ' ' + this.message;
};

var ValidatorResult = exports.ValidatorResult = function ValidatorResult(instance, schema, options, ctx) {
  this.instance = instance;
  this.schema = schema;
  this.propertyPath = ctx.propertyPath;
  this.errors = [];
  this.throwError = options && options.throwError;
  this.disableFormat = options && options.disableFormat === true;
};

ValidatorResult.prototype.addError = function addError(detail) {
  var err;
  if (typeof detail == 'string') {
    err = new ValidationError(detail, this.instance, this.schema, this.propertyPath);
  } else {
    if (!detail) throw new Error('Missing error detail');
    if (!detail.message) throw new Error('Missing error message');
    if (!detail.name) throw new Error('Missing validator type');
    err = new ValidationError(detail.message, this.instance, this.schema, this.propertyPath, detail.name, detail.argument);
  }

  if (this.throwError) {
    throw err;
  }
  this.errors.push(err);
  return err;
};

ValidatorResult.prototype.importErrors = function importErrors(res) {
  if (typeof res == 'string' || (res && res.validatorType)) {
    this.addError(res);
  } else if (res && res.errors) {
    var errs = this.errors;
    res.errors.forEach(function (v) {
      errs.push(v);
    });
  }
};

ValidatorResult.prototype.toString = function toString(res) {
  return this.errors.map(function(v,i){ return i+': '+v.toString()+'\n'; }).join('');
};

Object.defineProperty(ValidatorResult.prototype, "valid", { get: function() {
  return !this.errors.length;
} });

/**
 * Describes a problem with a Schema which prevents validation of an instance
 * @name SchemaError
 * @constructor
 */
var SchemaError = exports.SchemaError = function SchemaError (msg, schema) {
  this.message = msg;
  this.schema = schema;
  Error.call(this, msg);
  Error.captureStackTrace(this, SchemaError);
};
SchemaError.prototype = Object.create(Error.prototype,
  { constructor: {value: SchemaError, enumerable: false}
  , name: {value: 'SchemaError', enumerable: false}
  });

var SchemaContext = exports.SchemaContext = function SchemaContext (schema, options, propertyPath, base, schemas) {
  this.schema = schema;
  this.options = options;
  this.propertyPath = propertyPath;
  this.base = base;
  this.schemas = schemas;
};

SchemaContext.prototype.resolve = function resolve (target) {
  return uri.resolve(this.base, target);
};

SchemaContext.prototype.makeChild = function makeChild(schema, propertyName){
  var propertyPath = (propertyName===undefined) ? this.propertyPath : this.propertyPath+makeSuffix(propertyName);
  var base = uri.resolve(this.base, schema.id||'');
  var ctx = new SchemaContext(schema, this.options, propertyPath, base, Object.create(this.schemas));
  if(schema.id && !ctx.schemas[base]){
    ctx.schemas[base] = schema;
  }
  return ctx;
}

var FORMAT_REGEXPS = exports.FORMAT_REGEXPS = {
  'date-time': /^\d{4}-(?:0[0-9]{1}|1[0-2]{1})-(3[01]|0[1-9]|[12][0-9])[tT ](2[0-4]|[01][0-9]):([0-5][0-9]):(60|[0-5][0-9])(\.\d+)?([zZ]|[+-]([0-5][0-9]):(60|[0-5][0-9]))$/,
  'date': /^\d{4}-(?:0[0-9]{1}|1[0-2]{1})-(3[01]|0[1-9]|[12][0-9])$/,
  'time': /^(2[0-4]|[01][0-9]):([0-5][0-9]):(60|[0-5][0-9])$/,

  'email': /^(?:[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}[a-zA-Z0-9]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\]))$/,
  'ip-address': /^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/,
  'ipv6': /^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$/,
  'uri': /^[a-zA-Z][a-zA-Z0-9+-.]*:[^\s]*$/,

  'color': /^(#?([0-9A-Fa-f]{3}){1,2}\b|aqua|black|blue|fuchsia|gray|green|lime|maroon|navy|olive|orange|purple|red|silver|teal|white|yellow|(rgb\(\s*\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b\s*,\s*\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b\s*,\s*\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b\s*\))|(rgb\(\s*(\d?\d%|100%)+\s*,\s*(\d?\d%|100%)+\s*,\s*(\d?\d%|100%)+\s*\)))$/,

  // hostname regex from: http://stackoverflow.com/a/1420225/5628
  'hostname': /^(?=.{1,255}$)[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?(?:\.[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?)*\.?$/,
  'host-name': /^(?=.{1,255}$)[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?(?:\.[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?)*\.?$/,

  'alpha': /^[a-zA-Z]+$/,
  'alphanumeric': /^[a-zA-Z0-9]+$/,
  'utc-millisec': function (input) {
    return (typeof input === 'string') && parseFloat(input) === parseInt(input, 10) && !isNaN(input);
  },
  'regex': function (input) {
    var result = true;
    try {
      new RegExp(input);
    } catch (e) {
      result = false;
    }
    return result;
  },
  'style': /\s*(.+?):\s*([^;]+);?/g,
  'phone': /^\+(?:[0-9] ?){6,14}[0-9]$/
};

FORMAT_REGEXPS.regexp = FORMAT_REGEXPS.regex;
FORMAT_REGEXPS.pattern = FORMAT_REGEXPS.regex;
FORMAT_REGEXPS.ipv4 = FORMAT_REGEXPS['ip-address'];

exports.isFormat = function isFormat (input, format, validator) {
  if (typeof input === 'string' && FORMAT_REGEXPS[format] !== undefined) {
    if (FORMAT_REGEXPS[format] instanceof RegExp) {
      return FORMAT_REGEXPS[format].test(input);
    }
    if (typeof FORMAT_REGEXPS[format] === 'function') {
      return FORMAT_REGEXPS[format](input);
    }
  } else if (validator && validator.customFormats &&
      typeof validator.customFormats[format] === 'function') {
    return validator.customFormats[format](input);
  }
  return true;
};

var makeSuffix = exports.makeSuffix = function makeSuffix (key) {
  key = key.toString();
  // This function could be capable of outputting valid a ECMAScript string, but the
  // resulting code for testing which form to use would be tens of thousands of characters long
  // That means this will use the name form for some illegal forms
  if (!key.match(/[.\s\[\]]/) && !key.match(/^[\d]/)) {
    return '.' + key;
  }
  if (key.match(/^\d+$/)) {
    return '[' + key + ']';
  }
  return '[' + JSON.stringify(key) + ']';
};

exports.deepCompareStrict = function deepCompareStrict (a, b) {
  if (typeof a !== typeof b) {
    return false;
  }
  if (a instanceof Array) {
    if (!(b instanceof Array)) {
      return false;
    }
    if (a.length !== b.length) {
      return false;
    }
    return a.every(function (v, i) {
      return deepCompareStrict(a[i], b[i]);
    });
  }
  if (typeof a === 'object') {
    if (!a || !b) {
      return a === b;
    }
    var aKeys = Object.keys(a);
    var bKeys = Object.keys(b);
    if (aKeys.length !== bKeys.length) {
      return false;
    }
    return aKeys.every(function (v) {
      return deepCompareStrict(a[v], b[v]);
    });
  }
  return a === b;
};

module.exports.deepMerge = function deepMerge (target, src) {
  var array = Array.isArray(src);
  var dst = array && [] || {};

  if (array) {
    target = target || [];
    dst = dst.concat(target);
    src.forEach(function (e, i) {
      if (typeof e === 'object') {
        dst[i] = deepMerge(target[i], e)
      } else {
        if (target.indexOf(e) === -1) {
          dst.push(e)
        }
      }
    });
  } else {
    if (target && typeof target === 'object') {
      Object.keys(target).forEach(function (key) {
        dst[key] = target[key];
      });
    }
    Object.keys(src).forEach(function (key) {
      if (typeof src[key] !== 'object' || !src[key]) {
        dst[key] = src[key];
      }
      else {
        if (!target[key]) {
          dst[key] = src[key];
        } else {
          dst[key] = deepMerge(target[key], src[key])
        }
      }
    });
  }

  return dst;
};

/**
 * Validates instance against the provided schema
 * Implements URI+JSON Pointer encoding, e.g. "%7e"="~0"=>"~", "~1"="%2f"=>"/"
 * @param o
 * @param s The path to walk o along
 * @return any
 */
exports.objectGetPath = function objectGetPath(o, s) {
  var parts = s.split('/').slice(1);
  var k;
  while (typeof (k=parts.shift()) == 'string') {
    var n = decodeURIComponent(k.replace(/~0/,'~').replace(/~1/g,'/'));
    if (!(n in o)) return;
    o = o[n];
  }
  return o;
};

/**
 * Accept an Array of property names and return a JSON Pointer URI fragment
 * @param Array a
 * @return {String}
 */
exports.encodePath = function encodePointer(a){
	// ~ must be encoded explicitly because hacks
	// the slash is encoded by encodeURIComponent
	return a.map(function(v){ return '/'+encodeURIComponent(v).replace(/~/g,'%7E'); }).join('');
};
