// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

package web

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

	"github.com/gorilla/mux"

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

const (
	PageDefault        = 0
	PerPageDefault     = 60
	PerPageMaximum     = 200
	LogsPerPageDefault = 10000
	LogsPerPageMaximum = 10000
	LimitDefault       = 60
	LimitMaximum       = 200
)

type Params struct {
	UserId                             string
	OtherUserId                        string
	TeamId                             string
	InviteId                           string
	TokenId                            string
	ThreadId                           string
	Timestamp                          int64
	TimeRange                          string
	ChannelId                          string
	PostId                             string
	PolicyId                           string
	FileId                             string
	Filename                           string
	UploadId                           string
	PluginId                           string
	CommandId                          string
	HookId                             string
	ReportId                           string
	EmojiId                            string
	AppId                              string
	Email                              string
	Username                           string
	TeamName                           string
	ChannelName                        string
	PreferenceName                     string
	EmojiName                          string
	Category                           string
	Service                            string
	JobId                              string
	JobType                            string
	ActionId                           string
	RoleId                             string
	RoleName                           string
	SchemeId                           string
	Scope                              string
	GroupId                            string
	Page                               int
	PerPage                            int
	LogsPerPage                        int
	Permanent                          bool
	RemoteId                           string
	SyncableId                         string
	SyncableType                       model.GroupSyncableType
	BotUserId                          string
	Q                                  string
	IsLinked                           *bool
	IsConfigured                       *bool
	NotAssociatedToTeam                string
	NotAssociatedToChannel             string
	Paginate                           *bool
	IncludeMemberCount                 bool
	IncludeMemberIDs                   bool
	NotAssociatedToGroup               string
	ExcludeDefaultChannels             bool
	LimitAfter                         int
	LimitBefore                        int
	GroupIDs                           string
	IncludeTotalCount                  bool
	IncludeDeleted                     bool
	FilterAllowReference               bool
	FilterArchived                     bool
	FilterParentTeamPermitted          bool
	CategoryId                         string
	ExportName                         string
	ImportName                         string
	ExcludePolicyConstrained           bool
	GroupSource                        model.GroupSource
	FilterHasMember                    string
	IncludeChannelMemberCount          string
	OutgoingOAuthConnectionID          string
	ExcludeOffline                     bool
	InChannel                          string
	NotInChannel                       string
	Topic                              string
	CreatorId                          string
	OnlyConfirmed                      bool
	OnlyPlugins                        bool
	IncludeUnconfirmed                 bool
	ExcludeConfirmed                   bool
	ExcludePlugins                     bool
	ExcludeHome                        bool
	ExcludeRemote                      bool
	AccessControlPolicyEnforced        bool
	ExcludeAccessControlPolicyEnforced bool
	ContentReviewerId                  string

	//Bookmarks
	ChannelBookmarkId string
	BookmarksSince    int64

	// Cloud
	InvoiceId string

	// Custom Profile Attributes
	FieldId string
}

var getChannelMembersForUserRegex = regexp.MustCompile("/api/v4/users/[A-Za-z0-9]{26}/channel_members")

func ParamsFromRequest(r *http.Request) *Params {
	params := &Params{}

	props := mux.Vars(r)
	query := r.URL.Query()

	params.UserId = props["user_id"]
	params.OtherUserId = props["other_user_id"]
	params.TeamId = props["team_id"]
	params.CategoryId = props["category_id"]
	params.InviteId = props["invite_id"]
	params.TokenId = props["token_id"]
	params.ThreadId = props["thread_id"]

	if val, ok := props["channel_id"]; ok {
		params.ChannelId = val
	} else {
		params.ChannelId = query.Get("channel_id")
	}

	params.PostId = props["post_id"]
	params.PolicyId = props["policy_id"]
	params.FileId = props["file_id"]
	params.Filename = query.Get("filename")
	params.UploadId = props["upload_id"]
	if val, ok := props["plugin_id"]; ok {
		params.PluginId = val
	} else {
		params.PluginId = query.Get("plugin_id")
	}
	params.CommandId = props["command_id"]
	params.HookId = props["hook_id"]
	params.ReportId = props["report_id"]
	params.EmojiId = props["emoji_id"]
	params.AppId = props["app_id"]
	params.Email = props["email"]
	params.Username = props["username"]
	params.TeamName = strings.ToLower(props["team_name"])
	params.ChannelName = strings.ToLower(props["channel_name"])
	params.Category = props["category"]
	params.Service = props["service"]
	params.PreferenceName = props["preference_name"]
	params.EmojiName = props["emoji_name"]
	params.JobId = props["job_id"]
	params.JobType = props["job_type"]
	params.ActionId = props["action_id"]
	params.RoleId = props["role_id"]
	params.RoleName = props["role_name"]
	params.SchemeId = props["scheme_id"]
	params.GroupId = props["group_id"]
	params.RemoteId = props["remote_id"]
	params.InvoiceId = props["invoice_id"]
	params.OutgoingOAuthConnectionID = props["outgoing_oauth_connection_id"]
	params.ExcludeOffline, _ = strconv.ParseBool(query.Get("exclude_offline"))
	params.InChannel = query.Get("in_channel")
	params.NotInChannel = query.Get("not_in_channel")
	params.Topic = query.Get("topic")
	params.CreatorId = query.Get("creator_id")
	params.OnlyConfirmed, _ = strconv.ParseBool(query.Get("only_confirmed"))
	params.OnlyPlugins, _ = strconv.ParseBool(query.Get("only_plugins"))
	params.IncludeUnconfirmed, _ = strconv.ParseBool(query.Get("include_unconfirmed"))
	params.ExcludeConfirmed, _ = strconv.ParseBool(query.Get("exclude_confirmed"))
	params.ExcludePlugins, _ = strconv.ParseBool(query.Get("exclude_plugins"))
	params.ExcludeHome, _ = strconv.ParseBool(query.Get("exclude_home"))
	params.ExcludeRemote, _ = strconv.ParseBool(query.Get("exclude_remote"))
	params.ChannelBookmarkId = props["bookmark_id"]
	params.FieldId = props["field_id"]
	params.Scope = query.Get("scope")

	if val, err := strconv.Atoi(query.Get("page")); err != nil || (val < 0 && params.UserId == "" && !getChannelMembersForUserRegex.MatchString(r.URL.Path)) {
		// We don't want to apply this logic for the getChannelMembersForUser API handler
		// because that API allows page=-1 to switch to streaming mode.
		params.Page = PageDefault
	} else {
		params.Page = val
	}

	if val, err := strconv.ParseInt(props["timestamp"], 10, 64); err != nil || val < 0 {
		params.Timestamp = 0
	} else {
		params.Timestamp = val
	}

	params.TimeRange = query.Get("time_range")
	params.Permanent, _ = strconv.ParseBool(query.Get("permanent"))

	val, err := strconv.Atoi(query.Get("per_page"))
	if err != nil || val < 0 {
		params.PerPage = PerPageDefault
	} else if val > PerPageMaximum {
		params.PerPage = PerPageMaximum
	} else {
		params.PerPage = val
	}

	if val, err := strconv.Atoi(query.Get("logs_per_page")); err != nil || val < 0 {
		params.LogsPerPage = LogsPerPageDefault
	} else if val > LogsPerPageMaximum {
		params.LogsPerPage = LogsPerPageMaximum
	} else {
		params.LogsPerPage = val
	}

	if val, err := strconv.Atoi(query.Get("limit_after")); err != nil || val < 0 {
		params.LimitAfter = LimitDefault
	} else if val > LimitMaximum {
		params.LimitAfter = LimitMaximum
	} else {
		params.LimitAfter = val
	}

	if val, err := strconv.Atoi(query.Get("limit_before")); err != nil || val < 0 {
		params.LimitBefore = LimitDefault
	} else if val > LimitMaximum {
		params.LimitBefore = LimitMaximum
	} else {
		params.LimitBefore = val
	}

	params.SyncableId = props["syncable_id"]

	switch props["syncable_type"] {
	case "teams":
		params.SyncableType = model.GroupSyncableTypeTeam
	case "channels":
		params.SyncableType = model.GroupSyncableTypeChannel
	}

	params.BotUserId = props["bot_user_id"]
	params.Q = query.Get("q")

	if val, err := strconv.ParseBool(query.Get("is_linked")); err == nil {
		params.IsLinked = &val
	}

	if val, err := strconv.ParseBool(query.Get("is_configured")); err == nil {
		params.IsConfigured = &val
	}

	params.NotAssociatedToTeam = query.Get("not_associated_to_team")
	params.NotAssociatedToChannel = query.Get("not_associated_to_channel")
	params.FilterAllowReference, _ = strconv.ParseBool(query.Get("filter_allow_reference"))
	params.FilterArchived, _ = strconv.ParseBool(query.Get("filter_archived"))
	params.FilterParentTeamPermitted, _ = strconv.ParseBool(query.Get("filter_parent_team_permitted"))
	params.IncludeChannelMemberCount = query.Get("include_channel_member_count")

	if val, err := strconv.ParseBool(query.Get("paginate")); err == nil {
		params.Paginate = &val
	}

	params.IncludeMemberCount, _ = strconv.ParseBool(query.Get("include_member_count"))
	params.IncludeMemberIDs, _ = strconv.ParseBool(query.Get("include_member_ids"))
	params.NotAssociatedToGroup = query.Get("not_associated_to_group")
	params.ExcludeDefaultChannels, _ = strconv.ParseBool(query.Get("exclude_default_channels"))
	params.GroupIDs = query.Get("group_ids")
	params.IncludeTotalCount, _ = strconv.ParseBool(query.Get("include_total_count"))
	params.IncludeDeleted, _ = strconv.ParseBool(query.Get("include_deleted"))
	params.ExportName = props["export_name"]
	params.ImportName = props["import_name"]
	params.ExcludePolicyConstrained, _ = strconv.ParseBool(query.Get("exclude_policy_constrained"))
	params.AccessControlPolicyEnforced, _ = strconv.ParseBool(query.Get("access_control_policy_enforced"))
	params.ExcludeAccessControlPolicyEnforced, _ = strconv.ParseBool(query.Get("exclude_access_control_policy_enforced"))
	params.ContentReviewerId = props["content_reviewer_id"]

	if val := query.Get("group_source"); val != "" {
		switch val {
		case "custom":
			params.GroupSource = model.GroupSourceCustom
		default:
			params.GroupSource = model.GroupSourceLdap
		}
	}

	params.FilterHasMember = query.Get("filter_has_member")

	if val, err := strconv.ParseInt(query.Get("bookmarks_since"), 10, 64); err != nil || val < 0 {
		params.BookmarksSince = 0
	} else {
		params.BookmarksSince = val
	}

	return params
}