// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package routers

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/base"
	"code.gitea.io/gitea/modules/context"
	code_indexer "code.gitea.io/gitea/modules/indexer/code"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/structs"
	"code.gitea.io/gitea/modules/util"
	"code.gitea.io/gitea/routers/user"
)

const (
	// tplHome home page template
	tplHome base.TplName = "home"
	// tplExploreRepos explore repositories page template
	tplExploreRepos base.TplName = "explore/repos"
	// tplExploreDataset explore datasets page template
	tplExploreDataset base.TplName = "explore/datasets"
	// tplExploreUsers explore users page template
	tplExploreUsers base.TplName = "explore/users"
	// tplExploreOrganizations explore organizations page template
	tplExploreOrganizations base.TplName = "explore/organizations"
	// tplExploreCode explore code page template
	tplExploreCode                base.TplName = "explore/code"
	tplExploreImages              base.TplName = "explore/images"
	tplExploreExploreDataAnalysis base.TplName = "explore/data_analysis"
)

// Home render home page
func Home(ctx *context.Context) {
	ctx.Data["PageIsHome"] = true
	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled
	setRecommendURL(ctx)
	ctx.HTML(200, tplHome)
}

func setRecommendURL(ctx *context.Context) {
	addr := setting.RecommentRepoAddr[10:]
	start := strings.Index(addr, "/")
	end := strings.Index(addr, "raw")
	if start != -1 && end != -1 {
		ctx.Data["RecommendURL"] = addr[start:end]
	} else {
		ctx.Data["RecommendURL"] = setting.RecommentRepoAddr
	}

	ctx.Data["page_title"] = ctx.Tr("home.page_title")
	ctx.Data["page_small_title"] = ctx.Tr("home.page_small_title")
	ctx.Data["page_description"] = ctx.Tr("home.page_description")
	ctx.Data["page_use"] = ctx.Tr("home.page_use")
	ctx.Data["page_only_dynamic"] = ctx.Tr("home.page_only_dynamic")
	ctx.Data["page_recommend_org"] = ctx.Tr("home.page_recommend_org")
	ctx.Data["page_recommend_org_desc"] = ctx.Tr("home.page_recommend_org_desc")
	ctx.Data["page_recommend_org_commit"] = ctx.Tr("home.page_recommend_org_commit")
	ctx.Data["page_recommend_org_more"] = ctx.Tr("home.page_recommend_org_more")
	ctx.Data["page_recommend_repo"] = ctx.Tr("home.page_recommend_repo")
	ctx.Data["page_recommend_repo_desc"] = ctx.Tr("home.page_recommend_repo_desc")
	ctx.Data["page_recommend_repo_commit"] = ctx.Tr("home.page_recommend_repo_commit")
	ctx.Data["page_recommend_repo_go"] = ctx.Tr("home.page_recommend_repo_go")
	ctx.Data["page_recommend_repo_more"] = ctx.Tr("home.page_recommend_repo_more")
	ctx.Data["page_dev_env"] = ctx.Tr("home.page_dev_env")
	ctx.Data["page_dev_env_desc"] = ctx.Tr("home.page_dev_env_desc")
	ctx.Data["page_dev_env_desc_title"] = ctx.Tr("home.page_dev_env_desc_title")
	ctx.Data["page_dev_env_desc_desc"] = ctx.Tr("home.page_dev_env_desc_desc")
	ctx.Data["page_dev_env_desc1_title"] = ctx.Tr("home.page_dev_env_desc1_title")
	ctx.Data["page_dev_env_desc1_desc"] = ctx.Tr("home.page_dev_env_desc1_desc")
	ctx.Data["page_dev_env_desc2_title"] = ctx.Tr("home.page_dev_env_desc2_title")
	ctx.Data["page_dev_env_desc2_desc"] = ctx.Tr("home.page_dev_env_desc2_desc")
	ctx.Data["page_dev_env_desc3_title"] = ctx.Tr("home.page_dev_env_desc3_title")
	ctx.Data["page_dev_env_desc3_desc"] = ctx.Tr("home.page_dev_env_desc3_desc")
	ctx.Data["page_dev_yunlao"] = ctx.Tr("home.page_dev_yunlao")
	ctx.Data["page_dev_yunlao_desc1"] = ctx.Tr("home.page_dev_yunlao_desc1")
	ctx.Data["page_dev_yunlao_desc2"] = ctx.Tr("home.page_dev_yunlao_desc2")
	ctx.Data["page_dev_yunlao_desc3"] = ctx.Tr("home.page_dev_yunlao_desc3")
	ctx.Data["page_dev_yunlao_desc4"] = ctx.Tr("home.page_dev_yunlao_desc4")
	ctx.Data["page_dev_yunlao_apply"] = ctx.Tr("home.page_dev_yunlao_apply")
}

func Dashboard(ctx *context.Context) {
	if ctx.IsSigned {
		if !ctx.User.IsActive && setting.Service.RegisterEmailConfirm {
			ctx.Data["Title"] = ctx.Tr("auth.active_your_account")
			ctx.HTML(200, user.TplActivate)
		} else if !ctx.User.IsActive || ctx.User.ProhibitLogin {
			log.Info("Failed authentication attempt for %s from %s", ctx.User.Name, ctx.RemoteAddr())
			ctx.Data["Title"] = ctx.Tr("auth.prohibit_login")
			ctx.HTML(200, "user/auth/prohibit_login")
		} else if ctx.User.MustChangePassword {
			ctx.Data["Title"] = ctx.Tr("auth.must_change_password")
			ctx.Data["ChangePasscodeLink"] = setting.AppSubURL + "/user/change_password"
			ctx.SetCookie("redirect_to", setting.AppSubURL+ctx.Req.URL.RequestURI(), 0, setting.AppSubURL)
			ctx.Redirect(setting.AppSubURL + "/user/settings/change_password")
		} else {
			user.Dashboard(ctx)
		}
		return
		// Check non-logged users landing page.
	} else if setting.LandingPageURL != setting.LandingPageHome {
		ctx.Redirect(setting.AppSubURL + string(setting.LandingPageURL))
		return
	}

	// Check auto-login.
	uname := ctx.GetCookie(setting.CookieUserName)
	if len(uname) != 0 {
		ctx.Redirect(setting.AppSubURL + "/user/login")
		return
	}
	setRecommendURL(ctx)
	ctx.Data["PageIsHome"] = true
	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled
	ctx.HTML(200, tplHome)
}

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

var (
	nullByte = []byte{0x00}
)

func isKeywordValid(keyword string) bool {
	return !bytes.Contains([]byte(keyword), nullByte)
}

// RenderRepoSearch render repositories search page
func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
	page := ctx.QueryInt("page")
	if page <= 0 {
		page = 1
	}

	var (
		repos   []*models.Repository
		count   int64
		err     error
		orderBy models.SearchOrderBy
	)

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

	default:
		ctx.Data["SortType"] = "hot"
		orderBy = models.SearchOrderByHot
	}
	orderBy = orderBy + ",id"
	//todo:support other topics
	keyword := strings.Trim(ctx.Query("q"), " ")
	topic := strings.Trim(ctx.Query("topic"), " ")

	repos, count, err = models.SearchRepository(&models.SearchRepoOptions{
		ListOptions: models.ListOptions{
			Page:     page,
			PageSize: opts.PageSize,
		},
		Actor:              ctx.User,
		OrderBy:            orderBy,
		Private:            opts.Private,
		Keyword:            keyword,
		OwnerID:            opts.OwnerID,
		AllPublic:          true,
		AllLimited:         true,
		TopicName:          topic,
		IncludeDescription: setting.UI.SearchRepoDescription,
	})
	if err != nil {
		ctx.ServerError("SearchRepository", err)
		return
	}

	for _, repo := range repos {
		repo.Hot = int64(repo.NumWatches) + int64(repo.NumStars) + int64(repo.NumForks) + int64(repo.CloneCnt)
		repo.Active = int64(repo.NumIssues) + int64(repo.NumPulls) + int64(repo.NumCommit)
	}
	ctx.Data["Keyword"] = keyword
	ctx.Data["Topic"] = topic

	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")
	ctx.Data["Page"] = pager

	recommendOrgs, err := models.GetRecommendOrgInfos()
	if err != nil {
		log.Error("GetRecommendOrgInfos failed:%v", err.Error(), ctx.Data["MsgID"])
		ctx.ServerError("GetRecommendOrgInfos", err)
		return
	}
	ctx.Data["RecommendOrgs"] = recommendOrgs

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

// ExploreRepos render explore repositories page
func ExploreRepos(ctx *context.Context) {
	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.User != nil && !ctx.User.IsAdmin {
		ownerID = ctx.User.ID
	}

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

func ExploreDatasets(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("explore")
	ctx.Data["PageIsExplore"] = true
	ctx.Data["PageIsExploreDatasets"] = true
	// ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled

	var (
		datasets []*models.Dataset
		count    int64
		err      error
		orderBy  models.SearchOrderBy
	)
	page := ctx.QueryInt("page")
	if page <= 0 {
		page = 1
	}
	ctx.Data["SortType"] = ctx.Query("sort")
	switch ctx.Query("sort") {
	case "newest":
		orderBy = models.SearchOrderByNewest
	case "oldest":
		orderBy = models.SearchOrderByOldest
	case "recentupdate":
		orderBy = models.SearchOrderByRecentUpdated
	case "leastupdate":
		orderBy = models.SearchOrderByLeastUpdated
	case "reversealphabetically":
		orderBy = models.SearchOrderByAlphabeticallyReverse
	case "alphabetically":
		orderBy = models.SearchOrderByAlphabetically
	case "reversesize":
		orderBy = models.SearchOrderBySizeReverse
	case "downloadtimes":
		orderBy = models.SearchOrderByDownloadTimes
	default:
		ctx.Data["SortType"] = "recentupdate"
		orderBy = models.SearchOrderByRecentUpdated
	}

	keyword := strings.Trim(ctx.Query("q"), " ")

	var ownerID int64
	if ctx.User != nil && !ctx.User.IsAdmin {
		ownerID = ctx.User.ID
	}
	opts := &models.SearchDatasetOptions{
		Keyword:       keyword,
		IncludePublic: true,
		SearchOrderBy: orderBy,
		OwnerID:       ownerID,
		ListOptions: models.ListOptions{
			Page:     page,
			PageSize: setting.UI.ExplorePagingNum,
		},
	}

	datasets, count, err = models.SearchDataset(opts)
	if err != nil {
		ctx.ServerError("SearchDatasets", err)
		return
	}

	pager := context.NewPagination(int(count), opts.PageSize, page, 5)
	ctx.Data["Keyword"] = opts.Keyword
	pager.SetDefaultParams(ctx)
	ctx.Data["Page"] = pager

	ctx.Data["Datasets"] = datasets
	ctx.Data["Total"] = count
	ctx.Data["PageIsDatasets"] = true
	ctx.HTML(200, tplExploreDataset)
}

// RenderUserSearch render user search page
func RenderUserSearch(ctx *context.Context, opts *models.SearchUserOptions, tplName base.TplName) {
	opts.Page = ctx.QueryInt("page")
	if opts.Page <= 1 {
		opts.Page = 1
	}

	var (
		users   []*models.User
		count   int64
		err     error
		orderBy models.SearchOrderBy
	)

	ctx.Data["SortType"] = ctx.Query("sort")
	switch ctx.Query("sort") {
	case "newest":
		orderBy = models.SearchOrderByIDReverse
	case "oldest":
		orderBy = models.SearchOrderByID
	case "recentupdate":
		orderBy = models.SearchOrderByRecentUpdated
	case "leastupdate":
		orderBy = models.SearchOrderByLeastUpdated
	case "reversealphabetically":
		orderBy = models.SearchOrderByAlphabeticallyReverse
	case "alphabetically":
		orderBy = models.SearchOrderByAlphabetically
	default:
		ctx.Data["SortType"] = "alphabetically"
		orderBy = models.SearchOrderByAlphabetically
	}

	opts.Keyword = strings.Trim(ctx.Query("q"), " ")
	opts.OrderBy = orderBy
	if len(opts.Keyword) == 0 || isKeywordValid(opts.Keyword) {
		users, count, err = models.SearchUsers(opts)
		if err != nil {
			ctx.ServerError("SearchUsers", err)
			return
		}
	}
	ctx.Data["Keyword"] = opts.Keyword
	ctx.Data["Total"] = count
	ctx.Data["Users"] = users
	ctx.Data["ShowUserEmail"] = setting.UI.ShowUserEmail
	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled

	pager := context.NewPagination(int(count), opts.PageSize, opts.Page, 5)
	pager.SetDefaultParams(ctx)
	ctx.Data["Page"] = pager

	ctx.HTML(200, tplName)
}

// ExploreUsers render explore users page
func ExploreUsers(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("explore")
	ctx.Data["PageIsExplore"] = true
	ctx.Data["PageIsExploreUsers"] = true
	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled

	RenderUserSearch(ctx, &models.SearchUserOptions{
		Actor:       ctx.User,
		Type:        models.UserTypeIndividual,
		ListOptions: models.ListOptions{PageSize: setting.UI.ExplorePagingNum},
		IsActive:    util.OptionalBoolTrue,
		Visible:     []structs.VisibleType{structs.VisibleTypePublic, structs.VisibleTypeLimited, structs.VisibleTypePrivate},
	}, tplExploreUsers)
}

// ExploreOrganizations render explore organizations page
func ExploreOrganizations(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("explore")
	ctx.Data["PageIsExplore"] = true
	ctx.Data["PageIsExploreOrganizations"] = true
	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled

	visibleTypes := []structs.VisibleType{structs.VisibleTypePublic}
	if ctx.User != nil {
		visibleTypes = append(visibleTypes, structs.VisibleTypeLimited, structs.VisibleTypePrivate)
	}

	RenderUserSearch(ctx, &models.SearchUserOptions{
		Actor:       ctx.User,
		Type:        models.UserTypeOrganization,
		ListOptions: models.ListOptions{PageSize: setting.UI.ExplorePagingNum},
		Visible:     visibleTypes,
	}, tplExploreOrganizations)
}

// ExploreCode render explore code page
func ExploreCode(ctx *context.Context) {
	if !setting.Indexer.RepoIndexerEnabled {
		ctx.Redirect(setting.AppSubURL+"/explore", 302)
		return
	}

	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled
	ctx.Data["Title"] = ctx.Tr("explore")
	ctx.Data["PageIsExplore"] = true
	ctx.Data["PageIsExploreCode"] = true

	language := strings.TrimSpace(ctx.Query("l"))
	keyword := strings.TrimSpace(ctx.Query("q"))
	page := ctx.QueryInt("page")
	if page <= 0 {
		page = 1
	}

	var (
		repoIDs []int64
		err     error
		isAdmin bool
		userID  int64
	)
	if ctx.User != nil {
		userID = ctx.User.ID
		isAdmin = ctx.User.IsAdmin
	}

	// guest user or non-admin user
	if ctx.User == nil || !isAdmin {
		repoIDs, err = models.FindUserAccessibleRepoIDs(ctx.User)
		if err != nil {
			ctx.ServerError("SearchResults", err)
			return
		}
	}

	var (
		total                 int
		searchResults         []*code_indexer.Result
		searchResultLanguages []*code_indexer.SearchResultLanguages
	)

	// if non-admin login user, we need check UnitTypeCode at first
	if ctx.User != nil && len(repoIDs) > 0 {
		repoMaps, err := models.GetRepositoriesMapByIDs(repoIDs)
		if err != nil {
			ctx.ServerError("SearchResults", err)
			return
		}

		var rightRepoMap = make(map[int64]*models.Repository, len(repoMaps))
		repoIDs = make([]int64, 0, len(repoMaps))
		for id, repo := range repoMaps {
			if repo.CheckUnitUser(userID, isAdmin, models.UnitTypeCode) {
				rightRepoMap[id] = repo
				repoIDs = append(repoIDs, id)
			}
		}

		ctx.Data["RepoMaps"] = rightRepoMap

		total, searchResults, searchResultLanguages, err = code_indexer.PerformSearch(repoIDs, language, keyword, page, setting.UI.RepoSearchPagingNum)
		if err != nil {
			ctx.ServerError("SearchResults", err)
			return
		}
		// if non-login user or isAdmin, no need to check UnitTypeCode
	} else if (ctx.User == nil && len(repoIDs) > 0) || isAdmin {
		total, searchResults, searchResultLanguages, err = code_indexer.PerformSearch(repoIDs, language, keyword, page, setting.UI.RepoSearchPagingNum)
		if err != nil {
			ctx.ServerError("SearchResults", err)
			return
		}

		var loadRepoIDs = make([]int64, 0, len(searchResults))
		for _, result := range searchResults {
			var find bool
			for _, id := range loadRepoIDs {
				if id == result.RepoID {
					find = true
					break
				}
			}
			if !find {
				loadRepoIDs = append(loadRepoIDs, result.RepoID)
			}
		}

		repoMaps, err := models.GetRepositoriesMapByIDs(loadRepoIDs)
		if err != nil {
			ctx.ServerError("SearchResults", err)
			return
		}

		ctx.Data["RepoMaps"] = repoMaps
	}

	ctx.Data["Keyword"] = keyword
	ctx.Data["Language"] = language
	ctx.Data["SearchResults"] = searchResults
	ctx.Data["SearchResultLanguages"] = searchResultLanguages
	ctx.Data["RequireHighlightJS"] = true
	ctx.Data["PageIsViewCode"] = true

	pager := context.NewPagination(total, setting.UI.RepoSearchPagingNum, page, 5)
	pager.SetDefaultParams(ctx)
	pager.AddParam(ctx, "l", "Language")
	ctx.Data["Page"] = pager

	ctx.HTML(200, tplExploreCode)
}

func ExploreImages(ctx *context.Context) {
	ctx.HTML(200, tplExploreImages)
}

func ExploreDataAnalysis(ctx *context.Context) {
	ctx.HTML(200, tplExploreExploreDataAnalysis)
}

// NotFound render 404 page
func NotFound(ctx *context.Context) {
	ctx.Data["Title"] = "Page Not Found"
	ctx.NotFound("home.NotFound", nil)
}

func RecommendOrgFromPromote(ctx *context.Context) {
	url := setting.RecommentRepoAddr + "organizations"
	result, err := recommendFromPromote(url)
	if err != nil {
		ctx.ServerError("500", err)
		return
	}
	resultOrg := make([]map[string]interface{}, 0)
	for _, userName := range result {
		user, err := models.GetUserByName(userName)
		if err == nil {
			userMap := make(map[string]interface{})
			userMap["Name"] = user.Name
			userMap["Description"] = user.Description
			userMap["FullName"] = user.FullName
			userMap["ID"] = user.ID
			userMap["Avatar"] = user.RelAvatarLink()
			userMap["NumRepos"] = user.NumRepos
			userMap["NumTeams"] = user.NumTeams
			userMap["NumMembers"] = user.NumMembers
			resultOrg = append(resultOrg, userMap)
		} else {
			log.Info("query user error," + err.Error())
		}
	}

	ctx.JSON(200, resultOrg)
}

func recommendFromPromote(url string) ([]string, error) {
	resp, err := http.Get(url)
	if err != nil || resp.StatusCode != 200 {
		log.Info("Get organizations url error=" + err.Error())
		return nil, err
	}
	bytes, err := ioutil.ReadAll(resp.Body)
	resp.Body.Close()
	if err != nil {
		log.Info("Get organizations url error=" + err.Error())
		return nil, err
	}

	allLineStr := string(bytes)
	lines := strings.Split(allLineStr, "\n")
	result := make([]string, len(lines))
	for i, line := range lines {
		log.Info("i=" + fmt.Sprint(i) + " line=" + line)
		result[i] = strings.Trim(line, " ")
	}
	return result, nil
}

func RecommendRepoFromPromote(ctx *context.Context) {
	url := setting.RecommentRepoAddr + "projects"
	result, err := recommendFromPromote(url)
	if err != nil {
		ctx.ServerError("500", err)
		return
	}
	resultRepo := make([]map[string]interface{}, 0)
	//resultRepo := make([]*models.Repository, 0)
	for _, repoName := range result {
		tmpIndex := strings.Index(repoName, "/")
		if tmpIndex == -1 {
			log.Info("error repo name format.")
		} else {
			ownerName := strings.Trim(repoName[0:tmpIndex], " ")
			repoName := strings.Trim(repoName[tmpIndex+1:], " ")
			repo, err := models.GetRepositoryByOwnerAndName(ownerName, repoName)
			if err == nil {
				repoMap := make(map[string]interface{})
				repoMap["ID"] = fmt.Sprint(repo.ID)
				repoMap["Name"] = repo.Name
				repoMap["OwnerName"] = repo.OwnerName
				repoMap["NumStars"] = repo.NumStars
				repoMap["NumForks"] = repo.NumForks
				repoMap["Description"] = repo.Description
				repoMap["NumWatchs"] = repo.NumWatches
				repoMap["Topics"] = repo.Topics
				repoMap["Avatar"] = repo.RelAvatarLink()
				resultRepo = append(resultRepo, repoMap)
			} else {
				log.Info("query repo error," + err.Error())
			}
		}
	}
	ctx.JSON(200, resultRepo)
}