package handler

import (
	"github.com/ArtalkJS/Artalk/internal/config"
	"github.com/ArtalkJS/Artalk/internal/core"
	"github.com/ArtalkJS/Artalk/internal/entity"
	"github.com/ArtalkJS/Artalk/internal/i18n"
	"github.com/ArtalkJS/Artalk/internal/utils"
	"github.com/ArtalkJS/Artalk/server/common"
	"github.com/gofiber/fiber/v2"
	"gorm.io/gorm"
)

type ParamsStat struct {
	Type string `form:"type" validate:"required"`

	SiteName string
	PageKeys string `form:"page_keys"`

	Limit int `form:"limit"`

	SiteID  uint
	SiteAll bool
}

// @Summary      Statistics
// @Description  Get the statistics of various data analysed
// @Tags         Statistics
// @Param        type        formData  string  true   "the type of statistics"  Enums(latest_comments, latest_pages, pv_most_pages, comment_most_pages, page_pv, site_pv, page_comment, site_comment, rand_comments, rand_pages)
// @Param        page_keys   formData  string  false  "multiple page keys separated by commas"
// @Param        site_name   formData  string  false  "the site name of your content scope"
// @Param        limit       formData  int     false  "the amount of items you want"
// @Success      200  {object}  common.JSONResult
// @Router       /stat  [post]
func Stat(app *core.App, router fiber.Router) {
	router.Post("/stat", func(c *fiber.Ctx) error {
		var p ParamsStat
		if isOK, resp := common.ParamsDecode(c, &p); !isOK {
			return resp
		}

		// use site
		common.UseSite(c, &p.SiteName, &p.SiteID, &p.SiteAll)

		// Limit 限定
		if p.Limit <= 0 {
			p.Limit = 5
		}
		if p.Limit > 100 {
			p.Limit = 100
		}

		// 公共查询规则
		QueryPages := func(d *gorm.DB) *gorm.DB {
			return d.Model(&entity.Page{}).Where("site_name = ?", p.SiteName)
		}
		QueryComments := func(d *gorm.DB) *gorm.DB {
			return d.Model(&entity.Comment{}).Where("site_name = ? AND is_pending = ?", p.SiteName, false)
		}
		QueryOrderRand := func(d *gorm.DB) *gorm.DB {
			if app.Conf().DB.Type == config.TypeSQLite {
				return d.Order("RANDOM()") // SQLite case
			} else {
				return d.Order("RAND()")
			}
		}

		switch p.Type {
		case "latest_comments":
			// 最新评论
			var comments []entity.Comment
			app.Dao().DB().Scopes(QueryComments).
				Order("created_at DESC").
				Limit(p.Limit).
				Find(&comments)

			return common.RespData(c, app.Dao().CookAllComments(comments))

		case "latest_pages":
			// 最新页面
			var pages []entity.Page
			app.Dao().DB().Scopes(QueryPages).
				Order("created_at DESC").
				Limit(p.Limit).
				Find(&pages)

			return common.RespData(c, app.Dao().CookAllPages(pages))

		case "pv_most_pages":
			// PV 数最多的页面
			var pages []entity.Page
			app.Dao().DB().Scopes(QueryPages).
				Order("pv DESC").
				Limit(p.Limit).
				Find(&pages)

			return common.RespData(c, app.Dao().CookAllPages(pages))

		case "comment_most_pages":
			// 评论数最多的页面
			var pages []entity.Page
			app.Dao().DB().Raw(
				"SELECT * FROM pages p WHERE p.site_name = ? ORDER BY (SELECT COUNT(*) FROM comments c WHERE c.page_key = p.key AND c.is_pending = ?) DESC LIMIT ?",
				p.SiteName, false, p.Limit,
			).Find(&pages)

			return common.RespData(c, app.Dao().CookAllPages(pages))

		case "page_pv":
			// 查询页面的 PV 数
			keys := utils.SplitAndTrimSpace(p.PageKeys, ",")
			pvs := map[string]int{}
			for _, k := range keys {
				page := app.Dao().FindPage(k, p.SiteName)
				if !page.IsEmpty() {
					pvs[k] = page.PV
				} else {
					pvs[k] = 0
				}
			}

			return common.RespData(c, pvs)

		case "site_pv":
			// 全站 PV 数
			var pv int64
			app.Dao().DB().Raw("SELECT SUM(pv) FROM pages WHERE site_name = ?", p.SiteName).Row().Scan(&pv)

			return common.RespData(c, pv)

		case "page_comment":
			// 查询页面的评论数
			keys := utils.SplitAndTrimSpace(p.PageKeys, ",")
			counts := map[string]int64{}
			for _, k := range keys {
				var count int64
				app.Dao().DB().Scopes(QueryComments).Where("page_key = ?", k).Count(&count)

				counts[k] = count
			}

			return common.RespData(c, counts)

		case "site_comment":
			// 全站评论数
			var count int64
			app.Dao().DB().Scopes(QueryComments).Count(&count)

			return common.RespData(c, count)

		case "rand_comments":
			// 随机评论
			var comments []entity.Comment
			app.Dao().DB().Scopes(QueryComments, QueryOrderRand).
				Limit(p.Limit).
				Find(&comments)

			return common.RespData(c, app.Dao().CookAllComments(comments))

		case "rand_pages":
			// 随机页面
			var pages []entity.Page
			app.Dao().DB().Scopes(QueryPages, QueryOrderRand).
				Limit(p.Limit).
				Find(&pages)

			return common.RespData(c, app.Dao().CookAllPages(pages))
		}

		return common.RespError(c, i18n.T("Invalid {{name}}", Map{"name": i18n.T("Type")}))
	})
}