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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package explore

import (
	"net/http"

	"code.gitea.io/gitea/models/db"
	repo_model "code.gitea.io/gitea/models/repo"
	"code.gitea.io/gitea/modules/base"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/sitemap"
)

const (
	// tplExploreRepos explore repositories page template
	tplExploreRepos        base.TplName = "explore/repos"
	relevantReposOnlyParam string       = "no_filter"
)

// RepoSearchOptions when calling search repositories
type RepoSearchOptions struct {
	OwnerID    int64
	Private    bool
	Restricted bool
	PageSize   int
	TplName    base.TplName
}

// RenderRepoSearch render repositories search page
func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
	// Sitemap index for sitemap paths
	page := int(ctx.ParamsInt64("idx"))
	isSitemap := ctx.Params("idx") != ""
	if page <= 1 {
		page = ctx.FormInt("page")
	}

	if page <= 0 {
		page = 1
	}

	if isSitemap {
		opts.PageSize = setting.UI.SitemapPagingNum
	}

	var (
		repos            []*repo_model.Repository
		count            int64
		err              error
		orderBy          db.SearchOrderBy
		onlyShowRelevant bool
	)

	ctx.Data["SortType"] = ctx.FormString("sort")
	switch ctx.FormString("sort") {
	case "newest":
		orderBy = db.SearchOrderByNewest
	case "oldest":
		orderBy = db.SearchOrderByOldest
	case "leastupdate":
		orderBy = db.SearchOrderByLeastUpdated
	case "reversealphabetically":
		orderBy = db.SearchOrderByAlphabeticallyReverse
	case "alphabetically":
		orderBy = db.SearchOrderByAlphabetically
	case "reversesize":
		orderBy = db.SearchOrderBySizeReverse
	case "size":
		orderBy = db.SearchOrderBySize
	case "moststars":
		orderBy = db.SearchOrderByStarsReverse
	case "feweststars":
		orderBy = db.SearchOrderByStars
	case "mostforks":
		orderBy = db.SearchOrderByForksReverse
	case "fewestforks":
		orderBy = db.SearchOrderByForks
	default:
		ctx.Data["SortType"] = "recentupdate"
		orderBy = db.SearchOrderByRecentUpdated
	}

	onlyShowRelevant = !ctx.FormBool(relevantReposOnlyParam)

	keyword := ctx.FormTrim("q")

	ctx.Data["OnlyShowRelevant"] = onlyShowRelevant

	topicOnly := ctx.FormBool("topic")
	ctx.Data["TopicOnly"] = topicOnly

	language := ctx.FormTrim("language")
	ctx.Data["Language"] = language

	repos, count, err = repo_model.SearchRepository(ctx, &repo_model.SearchRepoOptions{
		ListOptions: db.ListOptions{
			Page:     page,
			PageSize: opts.PageSize,
		},
		Actor:              ctx.Doer,
		OrderBy:            orderBy,
		Private:            opts.Private,
		Keyword:            keyword,
		OwnerID:            opts.OwnerID,
		AllPublic:          true,
		AllLimited:         true,
		TopicOnly:          topicOnly,
		Language:           language,
		IncludeDescription: setting.UI.SearchRepoDescription,
		OnlyShowRelevant:   onlyShowRelevant,
	})
	if err != nil {
		ctx.ServerError("SearchRepository", err)
		return
	}
	if isSitemap {
		m := sitemap.NewSitemap()
		for _, item := range repos {
			m.Add(sitemap.URL{URL: item.HTMLURL(), LastMod: item.UpdatedUnix.AsTimePtr()})
		}
		ctx.Resp.Header().Set("Content-Type", "text/xml")
		if _, err := m.WriteTo(ctx.Resp); err != nil {
			log.Error("Failed writing sitemap: %v", err)
		}
		return
	}

	ctx.Data["Keyword"] = keyword
	ctx.Data["Total"] = count
	ctx.Data["Repos"] = repos
	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled

	pager := context.NewPagination(int(count), opts.PageSize, page, 5)
	pager.SetDefaultParams(ctx)
	pager.AddParam(ctx, "topic", "TopicOnly")
	pager.AddParam(ctx, "language", "Language")
	pager.AddParamString(relevantReposOnlyParam, ctx.FormString(relevantReposOnlyParam))
	ctx.Data["Page"] = pager

	ctx.HTML(http.StatusOK, opts.TplName)
}

// Repos render explore repositories page
func Repos(ctx *context.Context) {
	ctx.Data["UsersIsDisabled"] = setting.Service.Explore.DisableUsersPage
	ctx.Data["Title"] = ctx.Tr("explore")
	ctx.Data["PageIsExplore"] = true
	ctx.Data["PageIsExploreRepositories"] = true
	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled

	var ownerID int64
	if ctx.Doer != nil && !ctx.Doer.IsAdmin {
		ownerID = ctx.Doer.ID
	}

	RenderRepoSearch(ctx, &RepoSearchOptions{
		PageSize: setting.UI.ExplorePagingNum,
		OwnerID:  ownerID,
		Private:  ctx.Doer != nil,
		TplName:  tplExploreRepos,
	})
}