/*

Copyright 2017 Mikael Berthe

Licensed under the MIT license.  Please see the LICENSE file is this directory.

*/

package madon

import (

	"fmt"

	"strings"

	"github.com/sendgrid/rest"

)

// GetTimelines returns a timeline (a list of statuses

// timeline can be "home", "public", or a hashtag (use ":hashtag" or "#hashtag")

// For the public timelines, you can set 'local' to true to get only the

// local instance.

// If lopt.All is true, several requests will be made until the API server

// has nothing to return.

// If lopt.Limit is set (and not All), several queries can be made until the

// limit is reached.

func (mc *Client) GetTimelines(timeline string, local bool, lopt *LimitParams) ([]Status, error) {

	var endPoint string

	switch {

	case timeline == "home", timeline == "public":

		endPoint = "timelines/" + timeline

	case strings.HasPrefix(timeline, ":"), strings.HasPrefix(timeline, "#"):

		hashtag := timeline[1:]

		if hashtag == "" {

			return nil, fmt.Errorf("timelines API: empty hashtag")

		}

		endPoint = "timelines/tag/" + hashtag

	default:

		return nil, fmt.Errorf("GetTimelines: bad timelines argument")

	}

	params := make(apiCallParams)

	if timeline == "public" && local {

		params["local"] = "true"

	}

	var tl []Status

	var links apiLinks

	if err := mc.apiCall(endPoint, rest.Get, params, lopt, &links, &tl); err != nil {

		return nil, err

	}

	if lopt != nil { // Fetch more pages to reach our limit

		var statusSlice []Status

		for (lopt.All || lopt.Limit > len(tl)) && links.next != nil {

			newlopt := links.next

			links = apiLinks{}

			if err := mc.apiCall(endPoint, rest.Get, params, newlopt, &links, &statusSlice); err != nil {

				return nil, err

			}

			tl = append(tl, statusSlice...)

			statusSlice = statusSlice[:0] // Clear struct

		}

	}

	return tl, nil

}