/*
 * Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
 * Author: Alex Yatskov <alex@foosoft.net>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package main

import (
	"errors"
	"fmt"
	"strconv"
	"strings"

	"github.com/PuerkitoBio/goquery"
)

type tripadvisor struct {
	scrapeCtx
}

func (tripadvisor) define(keyword string) semantics {
	return map[string]semantics{
		"food":       {Accomodating: 0.0, Affordable: 0.0, Atmospheric: 0.0, Delicious: 1.0},
		"service":    {Accomodating: 1.0, Affordable: 0.0, Atmospheric: 0.0, Delicious: 0.0},
		"value":      {Accomodating: 0.0, Affordable: 1.0, Atmospheric: 0.0, Delicious: 0.0},
		"atmosphere": {Accomodating: 0.0, Affordable: 0.0, Atmospheric: 1.0, Delicious: 0.0},
	}[keyword]
}

func (tripadvisor) index(doc *goquery.Document) (string, []string) {
	var reviewUrls []string
	doc.Find("a.property_title").Each(func(index int, sel *goquery.Selection) {
		if href, ok := sel.Attr("href"); ok {
			reviewUrls = append(reviewUrls, href)
		}
	})

	var nextIndexUrl string
	if href, ok := doc.Find("div.deckTools.btm a.nav.next.rndBtn.rndBtnGreen.taLnk").Attr("href"); ok {
		nextIndexUrl = href
	}

	return nextIndexUrl, reviewUrls
}

func (tripadvisor) review(doc *goquery.Document) (name, address string, features map[string]float64, weight float64, err error) {
	if name = strings.TrimSpace(doc.Find("h1#HEADING").Text()); len(name) == 0 {
		err = errors.New("invalid name")
		return
	}

	{
		var addressParts []string
		doc.Find("address span.format_address > span:not(.extended-address)").Each(func(index int, sel *goquery.Selection) {
			addressParts = append(addressParts, strings.TrimSpace(sel.Text()))
		})

		if len(addressParts) == 0 {
			err = errors.New("invalid address")
			return
		}

		address = strings.Join(addressParts, " ")
	}

	{
		ratings := doc.Find("ul.barChart div.ratingRow img.sprite-rating_s_fill")
		if ratings.Length() != 4 {
			err = errors.New("invalid ratings")
			return
		}

		features = make(map[string]float64)
		for index, category := range []string{"food", "service", "value", "atmosphere"} {
			altText, _ := ratings.Eq(index).Attr("alt")
			valueText := strings.Split(altText, " ")[0]

			var value float64
			if value, err = strconv.ParseFloat(valueText, 8); err != nil {
				err = fmt.Errorf("invalid rating for %s", category)
				return
			}

			features[category] = value/2.5 - 1.0
		}
	}

	{
		weightValid := false
		if weightParts := strings.Split(doc.Find("h3.reviews_header").Text(), " "); len(weightParts) > 0 {
			if weight, err = strconv.ParseFloat(weightParts[0], 8); err == nil {
				weightValid = true
				return
			}
		}

		if !weightValid {
			err = fmt.Errorf("invalid review count")
			return
		}
	}

	return
}