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

package store

import (
	"strconv"
	"strings"

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

type SqlComplianceStore struct {
	SqlStore
}

func NewSqlComplianceStore(sqlStore SqlStore) 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) StoreChannel {

	storeChannel := make(StoreChannel, 1)

	go func() {
		result := StoreResult{}

		compliance.PreSave()
		if result.Err = compliance.IsValid(); result.Err != nil {
			storeChannel <- result
			close(storeChannel)
			return
		}

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

		storeChannel <- result
		close(storeChannel)
	}()

	return storeChannel
}

func (us SqlComplianceStore) Update(compliance *model.Compliance) StoreChannel {

	storeChannel := make(StoreChannel, 1)

	go func() {
		result := StoreResult{}

		if result.Err = compliance.IsValid(); result.Err != nil {
			storeChannel <- result
			close(storeChannel)
			return
		}

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

		storeChannel <- result
		close(storeChannel)
	}()

	return storeChannel
}

func (s SqlComplianceStore) GetAll(offset, limit int) StoreChannel {

	storeChannel := make(StoreChannel, 1)

	go func() {
		result := 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.NewLocAppError("SqlComplianceStore.Get", "store.sql_compliance.get.finding.app_error", nil, err.Error())
		} else {
			result.Data = compliances
		}

		storeChannel <- result
		close(storeChannel)
	}()

	return storeChannel
}

func (us SqlComplianceStore) Get(id string) StoreChannel {

	storeChannel := make(StoreChannel, 1)

	go func() {
		result := StoreResult{}

		if obj, err := us.GetReplica().Get(model.Compliance{}, id); err != nil {
			result.Err = model.NewLocAppError("SqlComplianceStore.Get", "store.sql_compliance.get.finding.app_error", nil, err.Error())
		} else if obj == nil {
			result.Err = model.NewLocAppError("SqlComplianceStore.Get", "store.sql_compliance.get.finding.app_error", nil, err.Error())
		} else {
			result.Data = obj.(*model.Compliance)
		}

		storeChannel <- result
		close(storeChannel)

	}()

	return storeChannel
}

func (s SqlComplianceStore) ComplianceExport(job *model.Compliance) StoreChannel {
	storeChannel := make(StoreChannel, 1)

	go func() {
		result := 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,
			    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-message" AS TeamName,
			    "Direct Message" AS TeamDisplayName,
			    Channels.Name AS ChannelName,
			    Channels.DisplayName AS ChannelDisplayName,
			    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.NewLocAppError("SqlPostStore.ComplianceExport", "store.sql_post.compliance_export.app_error", nil, err.Error())
		} else {
			result.Data = cposts
		}

		storeChannel <- result
		close(storeChannel)
	}()

	return storeChannel
}