// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package sqlstore

import (
	"net/http"
	"strconv"
	"strings"

	"github.com/mattermost/mattermost-server/model"
	"github.com/mattermost/mattermost-server/store"
)

type SqlComplianceStore struct {
	SqlStore
}

func NewSqlComplianceStore(sqlStore SqlStore) store.ComplianceStore {
	s := &SqlComplianceStore{sqlStore}

	for _, db := range sqlStore.GetAllConns() {
		table := db.AddTableWithName(model.Compliance{}, "Compliances").SetKeys(false, "Id")
		table.ColMap("Id").SetMaxSize(26)
		table.ColMap("UserId").SetMaxSize(26)
		table.ColMap("Status").SetMaxSize(64)
		table.ColMap("Desc").SetMaxSize(512)
		table.ColMap("Type").SetMaxSize(64)
		table.ColMap("Keywords").SetMaxSize(512)
		table.ColMap("Emails").SetMaxSize(1024)
	}

	return s
}

func (s SqlComplianceStore) CreateIndexesIfNotExists() {
}

func (s SqlComplianceStore) Save(compliance *model.Compliance) store.StoreChannel {
	return store.Do(func(result *store.StoreResult) {
		compliance.PreSave()
		if result.Err = compliance.IsValid(); result.Err != nil {
			return
		}

		if err := s.GetMaster().Insert(compliance); err != nil {
			result.Err = model.NewAppError("SqlComplianceStore.Save", "store.sql_compliance.save.saving.app_error", nil, err.Error(), http.StatusInternalServerError)
		} else {
			result.Data = compliance
		}
	})
}

func (us SqlComplianceStore) Update(compliance *model.Compliance) store.StoreChannel {
	return store.Do(func(result *store.StoreResult) {
		if result.Err = compliance.IsValid(); result.Err != nil {
			return
		}

		if _, err := us.GetMaster().Update(compliance); err != nil {
			result.Err = model.NewAppError("SqlComplianceStore.Update", "store.sql_compliance.save.saving.app_error", nil, err.Error(), http.StatusInternalServerError)
		} else {
			result.Data = compliance
		}
	})
}

func (s SqlComplianceStore) GetAll(offset, limit int) store.StoreChannel {
	return store.Do(func(result *store.StoreResult) {
		query := "SELECT * FROM Compliances ORDER BY CreateAt DESC LIMIT :Limit OFFSET :Offset"

		var compliances model.Compliances
		if _, err := s.GetReplica().Select(&compliances, query, map[string]interface{}{"Offset": offset, "Limit": limit}); err != nil {
			result.Err = model.NewAppError("SqlComplianceStore.Get", "store.sql_compliance.get.finding.app_error", nil, err.Error(), http.StatusInternalServerError)
		} else {
			result.Data = compliances
		}
	})
}

func (us SqlComplianceStore) Get(id string) store.StoreChannel {
	return store.Do(func(result *store.StoreResult) {
		if obj, err := us.GetReplica().Get(model.Compliance{}, id); err != nil {
			result.Err = model.NewAppError("SqlComplianceStore.Get", "store.sql_compliance.get.finding.app_error", nil, err.Error(), http.StatusInternalServerError)
		} else if obj == nil {
			result.Err = model.NewAppError("SqlComplianceStore.Get", "store.sql_compliance.get.finding.app_error", nil, err.Error(), http.StatusNotFound)
		} else {
			result.Data = obj.(*model.Compliance)
		}
	})
}

func (s SqlComplianceStore) ComplianceExport(job *model.Compliance) store.StoreChannel {
	return store.Do(func(result *store.StoreResult) {
		props := map[string]interface{}{"StartTime": job.StartAt, "EndTime": job.EndAt}

		keywordQuery := ""
		keywords := strings.Fields(strings.TrimSpace(strings.ToLower(strings.Replace(job.Keywords, ",", " ", -1))))
		if len(keywords) > 0 {

			keywordQuery = "AND ("

			for index, keyword := range keywords {
				if index >= 1 {
					keywordQuery += " OR LOWER(Posts.Message) LIKE :Keyword" + strconv.Itoa(index)
				} else {
					keywordQuery += "LOWER(Posts.Message) LIKE :Keyword" + strconv.Itoa(index)
				}

				props["Keyword"+strconv.Itoa(index)] = "%" + keyword + "%"
			}

			keywordQuery += ")"
		}

		emailQuery := ""
		emails := strings.Fields(strings.TrimSpace(strings.ToLower(strings.Replace(job.Emails, ",", " ", -1))))
		if len(emails) > 0 {

			emailQuery = "AND ("

			for index, email := range emails {
				if index >= 1 {
					emailQuery += " OR Users.Email = :Email" + strconv.Itoa(index)
				} else {
					emailQuery += "Users.Email = :Email" + strconv.Itoa(index)
				}

				props["Email"+strconv.Itoa(index)] = email
			}

			emailQuery += ")"
		}

		query :=
			`(SELECT
			    Teams.Name AS TeamName,
			    Teams.DisplayName AS TeamDisplayName,
			    Channels.Name AS ChannelName,
			    Channels.DisplayName AS ChannelDisplayName,
			    Channels.Type AS ChannelType,
			    Users.Username AS UserUsername,
			    Users.Email AS UserEmail,
			    Users.Nickname AS UserNickname,
			    Posts.Id AS PostId,
			    Posts.CreateAt AS PostCreateAt,
			    Posts.UpdateAt AS PostUpdateAt,
			    Posts.DeleteAt AS PostDeleteAt,
			    Posts.RootId AS PostRootId,
			    Posts.ParentId AS PostParentId,
			    Posts.OriginalId AS PostOriginalId,
			    Posts.Message AS PostMessage,
			    Posts.Type AS PostType,
			    Posts.Props AS PostProps,
			    Posts.Hashtags AS PostHashtags,
			    Posts.FileIds AS PostFileIds
			FROM
			    Teams,
			    Channels,
			    Users,
			    Posts
			WHERE
			    Teams.Id = Channels.TeamId
			        AND Posts.ChannelId = Channels.Id
			        AND Posts.UserId = Users.Id
			        AND Posts.CreateAt > :StartTime
			        AND Posts.CreateAt <= :EndTime
			        ` + emailQuery + `
			        ` + keywordQuery + `)
			UNION ALL
			(SELECT
			    'direct-messages' AS TeamName,
			    'Direct Messages' AS TeamDisplayName,
			    Channels.Name AS ChannelName,
			    Channels.DisplayName AS ChannelDisplayName,
			    Channels.Type AS ChannelType,
			    Users.Username AS UserUsername,
			    Users.Email AS UserEmail,
			    Users.Nickname AS UserNickname,
			    Posts.Id AS PostId,
			    Posts.CreateAt AS PostCreateAt,
			    Posts.UpdateAt AS PostUpdateAt,
			    Posts.DeleteAt AS PostDeleteAt,
			    Posts.RootId AS PostRootId,
			    Posts.ParentId AS PostParentId,
			    Posts.OriginalId AS PostOriginalId,
			    Posts.Message AS PostMessage,
			    Posts.Type AS PostType,
			    Posts.Props AS PostProps,
			    Posts.Hashtags AS PostHashtags,
			    Posts.FileIds AS PostFileIds
			FROM
			    Channels,
			    Users,
			    Posts
			WHERE
			    Channels.TeamId = ''
			        AND Posts.ChannelId = Channels.Id
			        AND Posts.UserId = Users.Id
			        AND Posts.CreateAt > :StartTime
			        AND Posts.CreateAt <= :EndTime
			        ` + emailQuery + `
			        ` + keywordQuery + `)
			ORDER BY PostCreateAt
			LIMIT 30000`

		var cposts []*model.CompliancePost

		if _, err := s.GetReplica().Select(&cposts, query, props); err != nil {
			result.Err = model.NewAppError("SqlPostStore.ComplianceExport", "store.sql_post.compliance_export.app_error", nil, err.Error(), http.StatusInternalServerError)
		} else {
			result.Data = cposts
		}
	})
}

func (s SqlComplianceStore) MessageExport(after int64, limit int) store.StoreChannel {
	return store.Do(func(result *store.StoreResult) {
		props := map[string]interface{}{"StartTime": after, "Limit": limit}
		query :=
			`SELECT
				Posts.Id AS PostId,
				Posts.CreateAt AS PostCreateAt,
				Posts.Message AS PostMessage,
				Posts.Type AS PostType,
				Posts.OriginalId AS PostOriginalId,
				Posts.RootId AS PostRootId,
				Posts.FileIds AS PostFileIds,
				Teams.Id AS TeamId,
				Teams.Name AS TeamName,
				Teams.DisplayName AS TeamDisplayName,
				Channels.Id AS ChannelId,
				CASE
					WHEN Channels.Type = 'D' THEN 'Direct Message'
					WHEN Channels.Type = 'G' THEN 'Group Message'
					ELSE Channels.DisplayName
				END AS ChannelDisplayName,
				Channels.Name AS ChannelName,
				Channels.Type AS ChannelType,
				Users.Id AS UserId,
				Users.Email AS UserEmail,
				Users.Username
			FROM
				Posts
				LEFT OUTER JOIN Channels ON Posts.ChannelId = Channels.Id
				LEFT OUTER JOIN Teams ON Channels.TeamId = Teams.Id
				LEFT OUTER JOIN Users ON Posts.UserId = Users.Id
			WHERE
				Posts.CreateAt > :StartTime AND
				Posts.Type = ''
			ORDER BY PostCreateAt
			LIMIT :Limit`

		var cposts []*model.MessageExport
		if _, err := s.GetReplica().Select(&cposts, query, props); err != nil {
			result.Err = model.NewAppError("SqlComplianceStore.MessageExport", "store.sql_compliance.message_export.app_error", nil, err.Error(), http.StatusInternalServerError)
		} else {
			result.Data = cposts
		}
	})
}