// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package api4

import (
	"net/http"
	"strconv"

	"github.com/gorilla/mux"
)

const (
	PAGE_DEFAULT     = 0
	PER_PAGE_DEFAULT = 60
	PER_PAGE_MAXIMUM = 200
)

type ApiParams struct {
	UserId    string
	TeamId    string
	ChannelId string
	PostId    string
	FileId    string
	CommandId string
	HookId    string
	EmojiId   string
	Email     string
	Username  string
	Page      int
	PerPage   int
}

func ApiParamsFromRequest(r *http.Request) *ApiParams {
	params := &ApiParams{}

	props := mux.Vars(r)

	if val, ok := props["user_id"]; ok {
		params.UserId = val
	}

	if val, ok := props["team_id"]; ok {
		params.TeamId = val
	}

	if val, ok := props["channel_id"]; ok {
		params.ChannelId = val
	}

	if val, ok := props["post_id"]; ok {
		params.PostId = val
	}

	if val, ok := props["file_id"]; ok {
		params.FileId = val
	}

	if val, ok := props["command_id"]; ok {
		params.CommandId = val
	}

	if val, ok := props["hook_id"]; ok {
		params.HookId = val
	}

	if val, ok := props["emoji_id"]; ok {
		params.EmojiId = val
	}

	if val, ok := props["email"]; ok {
		params.Email = val
	}

	if val, ok := props["username"]; ok {
		params.Username = val
	}

	if val, err := strconv.Atoi(r.URL.Query().Get("page")); err != nil {
		params.Page = PAGE_DEFAULT
	} else {
		params.Page = val
	}

	if val, err := strconv.Atoi(r.URL.Query().Get("per_page")); err != nil {
		params.PerPage = PER_PAGE_DEFAULT
	} else if val > PER_PAGE_MAXIMUM {
		params.PerPage = PER_PAGE_MAXIMUM
	} else {
		params.PerPage = val
	}

	return params
}