// 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
	ReportId       string
	EmojiId        string
	Email          string
	Username       string
	TeamName       string
	ChannelName    string
	PreferenceName string
	Category       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["report_id"]; ok {
		params.ReportId = 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, ok := props["team_name"]; ok {
		params.TeamName = val
	}

	if val, ok := props["channel_name"]; ok {
		params.ChannelName = val
	}

	if val, ok := props["category"]; ok {
		params.Category = val
	}

	if val, ok := props["preference_name"]; ok {
		params.PreferenceName = val
	}

	if val, err := strconv.Atoi(r.URL.Query().Get("page")); err != nil || val < 0 {
		params.Page = PAGE_DEFAULT
	} else {
		params.Page = val
	}

	if val, err := strconv.Atoi(r.URL.Query().Get("per_page")); err != nil || val < 0 {
		params.PerPage = PER_PAGE_DEFAULT
	} else if val > PER_PAGE_MAXIMUM {
		params.PerPage = PER_PAGE_MAXIMUM
	} else {
		params.PerPage = val
	}

	return params
}