package api

import (
	"fmt"
	"regexp"
	"strings"
	"time"

	"github.com/doug-martin/goqu/v9"
	"github.com/graphql-go/graphql"
	"github.com/thoas/go-funk"
)

type Game struct {
	ID           int       `json:"id" gorm:"primaryKey"`
	Title        string    `json:"title"`
	Orientation  string    `json:"orientation"`
	Device       string    `json:"device"`
	Era          string    `json:"era"`
	Tags         string    `json:"tags"`
	UserId       int       `json:"user_id"`
	Content      string    `json:"content"`
	Image        string    `json:"image"`
	Images       string    `json:"images"`
	User         User      `json:"user"          gorm:"foreignKey:UserId"`
	Collect      bool      `json:"collect"       gorm:"column:is_collect"`
	Praise       bool      `json:"praise"        gorm:"column:is_praise"`
	CollectCount int       `json:"collect_count" gorm:"column:collect_num"`
	PraiseCount  int       `json:"praise_count"  gorm:"column:praise"`
	CommentCount int       `json:"comment_count" gorm:"column:comment_num"`
	TextCount    int       `json:"text_count"    gorm:"column:text_count"`
	CreateTime   time.Time `json:"create_time"`
	UpdateTime   time.Time `json:"update_time"`
}

func (Game) TableName() string {
	return "web_article"
}

var gameType = graphql.NewObject(graphql.ObjectConfig{
	Name:        "Game",
	Description: "游戏",
	Fields: graphql.Fields{
		"id":            &graphql.Field{Type: graphql.Int, Description: "游戏ID"},
		"title":         &graphql.Field{Type: graphql.String, Description: "游戏标题"},
		"era":           &graphql.Field{Type: graphql.String, Description: "游戏上线年份"},
		"create_time":   &graphql.Field{Type: graphql.DateTime, Description: "游戏创建时间"},
		"update_time":   &graphql.Field{Type: graphql.DateTime, Description: "游戏更新时间"},
		"praise":        &graphql.Field{Type: graphql.Boolean, Description: "当前用户是否点赞"},
		"collect":       &graphql.Field{Type: graphql.Boolean, Description: "当前用户是否收藏"},
		"praise_count":  &graphql.Field{Type: graphql.Int, Description: "点赞数"},
		"collect_count": &graphql.Field{Type: graphql.Int, Description: "收藏数"},
		"text_count":    &graphql.Field{Type: graphql.Int, Description: "文字数量"},
	},
})

var GameItems = &graphql.Field{
	Name:        "games",
	Description: "游戏列表",
	Type: graphql.NewObject(graphql.ObjectConfig{
		Name:        "GameConnection",
		Description: "条件筛选游戏列表",
		Fields: graphql.Fields{
			"list":  &graphql.Field{Type: graphql.NewList(gameType), Description: "游戏列表"},
			"total": &graphql.Field{Type: graphql.Int, Description: "游戏总数"},
		},
	}),
	Args: graphql.FieldConfigArgument{
		"collect":     &graphql.ArgumentConfig{Type: graphql.Int, Description: "按指定用户收藏筛选"},
		"praise":      &graphql.ArgumentConfig{Type: graphql.Int, Description: "按指定用户点赞筛选"},
		"style":       &graphql.ArgumentConfig{Type: graphql.String, Description: "按风格筛选游戏"},
		"device":      &graphql.ArgumentConfig{Type: graphql.String, Description: "按平台筛选游戏"},
		"orientation": &graphql.ArgumentConfig{Type: graphql.String, Description: "按屏幕方向筛选游戏"},
		"era":         &graphql.ArgumentConfig{Type: graphql.String, Description: "按年份筛选游戏"},
		"category_id": &graphql.ArgumentConfig{Type: graphql.Int, Description: "按分类ID筛选游戏"},
		"tags":        &graphql.ArgumentConfig{Type: graphql.String, Description: "按标签筛选游戏"},
		"user_id":     &graphql.ArgumentConfig{Type: graphql.Int, Description: "按用户ID筛选游戏"},
		"id":          &graphql.ArgumentConfig{Type: graphql.Int, Description: "筛选游戏中指定ID的"},
		"title":       &graphql.ArgumentConfig{Type: graphql.String, Description: "筛选游戏中含有指定标题的"},
		"rank":        &graphql.ArgumentConfig{Type: graphql.String, Description: "筛选游戏中含有指定排名的"},
		"create_time": &graphql.ArgumentConfig{Type: graphql.DateTime, Description: "按创建时间筛选游戏"},
		"update_time": &graphql.ArgumentConfig{Type: graphql.DateTime, Description: "按修改时间筛选游戏"},
		"sort":        &graphql.ArgumentConfig{Type: graphql.String, Description: "按指定字段排序游戏", DefaultValue: "id"},
		"order":       &graphql.ArgumentConfig{Type: orderType, Description: "排序类型(升序或降序)", DefaultValue: "ASC"},
		"first":       &graphql.ArgumentConfig{Type: graphql.Int, Description: "翻页参数(傳回清單中的前n個元素)"},
		"last":        &graphql.ArgumentConfig{Type: graphql.Int, Description: "翻页参数(傳回清單中的最後n個元素)"},
		"after":       &graphql.ArgumentConfig{Type: graphql.String, Description: "翻页参数(傳回清單中指定遊標之後的元素)"},
		"before":      &graphql.ArgumentConfig{Type: graphql.String, Description: "翻页参数(傳回清單中指定遊標之前的元素)"},
	},
	Resolve: func(p graphql.ResolveParams) (interface{}, error) {
		var games []Game
		var total int
		var err error

		// 游戏的顶级ID为 22
		var query = goqu.Dialect("mysql").From("web_article").Where(goqu.Ex{"category_top_id": 22})

		// 筛选条件
		for _, format := range []string{"id", "title", "style", "device", "orientation", "era", "category_id", "tags"} {
			if p.Args[format] != nil {
				query = query.Where(goqu.C(format).Eq(p.Args[format]))
			}
		}

		// 按指定用户点赞筛选
		if p.Args["praise"] != nil {
			query = query.Join(goqu.T("web_praise"), goqu.On(
				goqu.I("web_article.id").Eq(goqu.I("web_praise.praise_id")),
				goqu.I("web_praise.user_id").Eq(p.Args["praise"]),
				goqu.I("web_praise.type").Eq(0),
			))
		}

		// 按指定用户收藏筛选
		if p.Args["collect"] != nil {
			query = query.Join(goqu.T("web_collect"), goqu.On(
				goqu.I("web_article.id").Eq(goqu.I("web_collect.collect_id")),
				goqu.I("web_collect.user_id").Eq(p.Args["collect"]),
				goqu.I("web_collect.type").Eq(0),
			))
		}

		// 如果查询了 total 字段
		if existField(p.Info.FieldASTs[0].SelectionSet.Selections, "total") {
			sql, _, _ := query.ToSQL()
			sql = strings.Replace(sql, "SELECT *", "SELECT COUNT(*)", 1)
			if err := db.Raw(sql).Scan(&total).Error; err != nil {
				return nil, err
			}
		}

		// 如果没有外部排序则使用指定排序(正则sort只能是字母数字下划下)
		if p.Args["text"] == nil && p.Args["similar"] == nil && p.Args["interest"] == nil {
			sort := regexp.MustCompile(`[^a-zA-Z0-9_]`).ReplaceAllString(p.Args["sort"].(string), "")
			query = query.Select("web_article.id", goqu.L(
				fmt.Sprintf("ROW_NUMBER() OVER(ORDER BY web_article.%s %s)", sort, p.Args["order"]),
			).As("row_num"))
		} else {
			// 排序条件
			if p.Args["sort"] != nil {
				if p.Args["order"].(string) == "ASC" {
					query = query.Order(goqu.C(p.Args["sort"].(string)).Asc())
				}
				if p.Args["order"].(string) == "DESC" {
					query = query.Order(goqu.C(p.Args["sort"].(string)).Desc())
				}
			}
		}

		// 取所有数据的前N条
		sql, _, _ := query.ToSQL()

		// 遊標截取篩選結果集的前N条
		var cursor string
		if p.Args["after"] != nil {
			cursor = fmt.Sprintf(`WHERE row_num > (SELECT row_num FROM RankedArticles WHERE RankedArticles.id = %d)`, p.Args["after"].(int))
		}

		var limit int = 10
		if p.Args["first"] != nil {
			limit = p.Args["first"].(int)
		} else if p.Args["last"] != nil {
			limit = p.Args["last"].(int)
		}

		// 字段选择
		var user_id = p.Context.Value("user_id").(int)
		var fields = ListItem(p.Info.FieldASTs[0].SelectionSet.Selections)
		var praise, praise_join, collect, collect_join, text_count string
		if funk.Contains(fields, "praise") {
			praise = ",CASE WHEN web_praise.id IS NOT NULL THEN TRUE ELSE FALSE END AS is_praise"
			praise_join = fmt.Sprintf("LEFT JOIN web_praise ON web_praise.praise_id = web_article.id AND web_praise.user_id = %d AND web_praise.type = 0", user_id)
		}
		if funk.Contains(fields, "collect") {
			collect = ",CASE WHEN web_collect.id IS NOT NULL THEN TRUE ELSE FALSE END AS is_collect"
			collect_join = fmt.Sprintf("LEFT JOIN web_collect ON web_collect.collect_id = web_article.id AND web_collect.user_id = %d AND web_collect.type = 0", user_id)
		}
		if funk.Contains(fields, "text_count") {
			text_count = ",(SELECT COUNT(*) FROM web_images wi WHERE wi.article_id = web_article.id AND wi.text != '') AS text_count"
		}

		sql = fmt.Sprintf(`
		WITH RankedArticles AS (%s)
		SELECT * %s %s %s FROM web_article INNER JOIN(
			SELECT id, row_num FROM RankedArticles %s
		) AS LimitedRanked ON LimitedRanked.id = web_article.id %s %s
		ORDER BY LimitedRanked.row_num ASC LIMIT %d
		`, sql, praise, collect, text_count, cursor, praise_join, collect_join, limit)

		fmt.Println(sql)

		if err := db.Raw(sql).Scan(&games).Error; err != nil {
			fmt.Println("获取游戏列表失败", err)
			return nil, err
		}

		return map[string]interface{}{
			"list":  games,
			"total": total,
		}, err
	},
}