/*

Copyright 2017 Mikael Berthe

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

*/

package madon

import (

	"fmt"

	"strconv"

	"github.com/pkg/errors"

	"github.com/sendgrid/rest"

)

// updateStatusOptions contains option fields for POST and DELETE API calls

type updateStatusOptions struct {

	// The ID is used for most commands

	ID int64

	// The following fields are used for posting a new status

	Status      string

	InReplyToID int64

	MediaIDs    []int64

	Sensitive   bool

	SpoilerText string

	Visibility  string // "direct", "private", "unlisted" or "public"

}

// getMultipleStatuses returns a list of status entities

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

// has nothing to return.

func (mc *Client) getMultipleStatuses(endPoint string, params apiCallParams, lopt *LimitParams) ([]Status, error) {

	var statuses []Status

	var links apiLinks

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

		return nil, err

	}

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

		var statusSlice []Status

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

			newlopt := links.next

			links = apiLinks{}

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

				return nil, err

			}

			statuses = append(statuses, statusSlice...)

			statusSlice = statusSlice[:0] // Clear struct

		}

	}

	return statuses, nil

}

// queryStatusData queries the statuses API

// The operation 'op' can be empty or "status" (the status itself), "context",

// "card", "reblogged_by", "favourited_by".

// The data argument will receive the object(s) returned by the API server.

func (mc *Client) queryStatusData(statusID int64, op string, data interface{}) error {

	if statusID < 1 {

		return ErrInvalidID

	}

	endPoint := "statuses/" + strconv.FormatInt(statusID, 10)

	if op != "" && op != "status" {

		switch op {

		case "context", "card", "reblogged_by", "favourited_by":

		default:

			return ErrInvalidParameter

		}

		endPoint += "/" + op

	}

	return mc.apiCall(endPoint, rest.Get, nil, nil, nil, data)

}

// updateStatusData updates the statuses

// The operation 'op' can be empty or "status" (to post a status), "delete"

// (for deleting a status), "reblog", "unreblog", "favourite", "unfavourite".

// The data argument will receive the object(s) returned by the API server.

func (mc *Client) updateStatusData(op string, opts updateStatusOptions, data interface{}) error {

	method := rest.Post

	endPoint := "statuses"

	params := make(apiCallParams)

	switch op {

	case "", "status":

		op = "status"

		if opts.Status == "" {

			return ErrInvalidParameter

		}

		switch opts.Visibility {

		case "", "direct", "private", "unlisted", "public":

			// Okay

		default:

			return ErrInvalidParameter

		}

		if len(opts.MediaIDs) > 4 {

			return errors.New("too many (>4) media IDs")

		}

	case "delete":

		method = rest.Delete

		if opts.ID < 1 {

			return ErrInvalidID

		}

		endPoint += "/" + strconv.FormatInt(opts.ID, 10)

	case "reblog", "unreblog", "favourite", "unfavourite":

		if opts.ID < 1 {

			return ErrInvalidID

		}

		endPoint += "/" + strconv.FormatInt(opts.ID, 10) + "/" + op

	default:

		return ErrInvalidParameter

	}

	// Form items for a new toot

	if op == "status" {

		params["status"] = opts.Status

		if opts.InReplyToID > 0 {

			params["in_reply_to_id"] = strconv.FormatInt(opts.InReplyToID, 10)

		}

		for i, id := range opts.MediaIDs {

			if id < 1 {

				return ErrInvalidID

			}

			qID := fmt.Sprintf("media_ids[%d]", i+1)

			params[qID] = strconv.FormatInt(id, 10)

		}

		if opts.Sensitive {

			params["sensitive"] = "true"

		}

		if opts.SpoilerText != "" {

			params["spoiler_text"] = opts.SpoilerText

		}

		if opts.Visibility != "" {

			params["visibility"] = opts.Visibility

		}

	}

	return mc.apiCall(endPoint, method, params, nil, nil, data)

}

// GetStatus returns a status

// The returned status can be nil if there is an error or if the

// requested ID does not exist.

func (mc *Client) GetStatus(statusID int64) (*Status, error) {

	var status Status

	if err := mc.queryStatusData(statusID, "status", &status); err != nil {

		return nil, err

	}

	if status.ID == 0 {

		return nil, ErrEntityNotFound

	}

	return &status, nil

}

// GetStatusContext returns a status context

func (mc *Client) GetStatusContext(statusID int64) (*Context, error) {

	var context Context

	if err := mc.queryStatusData(statusID, "context", &context); err != nil {

		return nil, err

	}

	return &context, nil

}

// GetStatusCard returns a status card

func (mc *Client) GetStatusCard(statusID int64) (*Card, error) {

	var card Card

	if err := mc.queryStatusData(statusID, "card", &card); err != nil {

		return nil, err

	}

	return &card, nil

}

// GetStatusRebloggedBy returns a list of the accounts who reblogged a status

func (mc *Client) GetStatusRebloggedBy(statusID int64, lopt *LimitParams) ([]Account, error) {

	o := &getAccountsOptions{ID: statusID, Limit: lopt}

	return mc.getMultipleAccountsHelper("reblogged_by", o)

}

// GetStatusFavouritedBy returns a list of the accounts who favourited a status

func (mc *Client) GetStatusFavouritedBy(statusID int64, lopt *LimitParams) ([]Account, error) {

	o := &getAccountsOptions{ID: statusID, Limit: lopt}

	return mc.getMultipleAccountsHelper("favourited_by", o)

}

// PostStatus posts a new "toot"

// All parameters but "text" can be empty.

// Visibility must be empty, or one of "direct", "private", "unlisted" and "public".

func (mc *Client) PostStatus(text string, inReplyTo int64, mediaIDs []int64, sensitive bool, spoilerText string, visibility string) (*Status, error) {

	var status Status

	o := updateStatusOptions{

		Status:      text,

		InReplyToID: inReplyTo,

		MediaIDs:    mediaIDs,

		Sensitive:   sensitive,

		SpoilerText: spoilerText,

		Visibility:  visibility,

	}

	err := mc.updateStatusData("status", o, &status)

	if err != nil {

		return nil, err

	}

	if status.ID == 0 {

		return nil, ErrEntityNotFound // TODO Change error message

	}

	return &status, err

}

// DeleteStatus deletes a status

func (mc *Client) DeleteStatus(statusID int64) error {

	var status Status

	o := updateStatusOptions{ID: statusID}

	err := mc.updateStatusData("delete", o, &status)

	return err

}

// ReblogStatus reblogs a status

func (mc *Client) ReblogStatus(statusID int64) error {

	var status Status

	o := updateStatusOptions{ID: statusID}

	err := mc.updateStatusData("reblog", o, &status)

	return err

}

// UnreblogStatus unreblogs a status

func (mc *Client) UnreblogStatus(statusID int64) error {

	var status Status

	o := updateStatusOptions{ID: statusID}

	err := mc.updateStatusData("unreblog", o, &status)

	return err

}

// FavouriteStatus favourites a status

func (mc *Client) FavouriteStatus(statusID int64) error {

	var status Status

	o := updateStatusOptions{ID: statusID}

	err := mc.updateStatusData("favourite", o, &status)

	return err

}

// UnfavouriteStatus unfavourites a status

func (mc *Client) UnfavouriteStatus(statusID int64) error {

	var status Status

	o := updateStatusOptions{ID: statusID}

	err := mc.updateStatusData("unfavourite", o, &status)

	return err

}