/*

Copyright 2017 Mikael Berthe

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

*/

package gondole

import (

	"fmt"

	"strconv"

	"github.com/sendgrid/rest"

)

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

type getAccountsOptions struct {

	// The ID is used for most commands

	ID int

	// The following fields are used when searching for accounts

	Q     string

	Limit int

}

// getSingleAccount returns an account entity

// The operation 'op' can be "account", "verify_credentials", "follow",

// "unfollow", "block", "unblock", "mute", "unmute",

// "follow_requests/authorize" or // "follow_requests/reject".

// The id is optional and depends on the operation.

func (g *Client) getSingleAccount(op string, id int) (*Account, error) {

	var endPoint string

	method := rest.Get

	strID := strconv.Itoa(id)

	switch op {

	case "account":

		endPoint = "accounts/" + strID

	case "verify_credentials":

		endPoint = "accounts/verify_credentials"

	case "follow", "unfollow", "block", "unblock", "mute", "unmute":

		endPoint = "accounts/" + strID + "/" + op

		method = rest.Post

	case "follow_requests/authorize", "follow_requests/reject":

		// The documentation is incorrect, the endpoint actually

		// is "follow_requests/:id/{authorize|reject}"

		endPoint = op[:16] + strID + "/" + op[16:]

		method = rest.Post

	default:

		return nil, ErrInvalidParameter

	}

	var account Account

	if err := g.apiCall(endPoint, method, nil, &account); err != nil {

		return nil, err

	}

	return &account, nil

}

// getMultipleAccounts returns a list of account entities

// The operation 'op' can be "followers", "following", "search", "blocks",

// "mutes", "follow_requests".

// The id is optional and depends on the operation.

func (g *Client) getMultipleAccounts(op string, opts *getAccountsOptions) ([]Account, error) {

	var endPoint string

	switch op {

	case "followers", "following":

		if opts == nil || opts.ID < 1 {

			return []Account{}, ErrInvalidID

		}

		endPoint = "accounts/" + strconv.Itoa(opts.ID) + "/" + op

	case "follow_requests", "blocks", "mutes":

		endPoint = op

	case "search":

		if opts == nil || opts.Q == "" {

			return []Account{}, ErrInvalidParameter

		}

		endPoint = "accounts/" + op

	default:

		return nil, ErrInvalidParameter

	}

	// Handle target-specific query parameters

	params := make(apiCallParams)

	if op == "search" {

		params["q"] = opts.Q

		if opts.Limit > 0 {

			params["limit"] = strconv.Itoa(opts.Limit)

		}

	}

	var accounts []Account

	if err := g.apiCall(endPoint, rest.Get, params, &accounts); err != nil {

		return nil, err

	}

	return accounts, nil

}

// GetAccount returns an account entity

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

// requested ID does not exist.

func (g *Client) GetAccount(accountID int) (*Account, error) {

	account, err := g.getSingleAccount("account", accountID)

	if err != nil {

		return nil, err

	}

	if account != nil && account.ID == 0 {

		return nil, ErrEntityNotFound

	}

	return account, nil

}

// GetCurrentAccount returns the current user account

func (g *Client) GetCurrentAccount() (*Account, error) {

	account, err := g.getSingleAccount("verify_credentials", 0)

	if err != nil {

		return nil, err

	}

	if account != nil && account.ID == 0 {

		return nil, ErrEntityNotFound

	}

	return account, nil

}

// GetAccountFollowers returns the list of accounts following a given account

func (g *Client) GetAccountFollowers(accountID int) ([]Account, error) {

	o := &getAccountsOptions{ID: accountID}

	return g.getMultipleAccounts("followers", o)

}

// GetAccountFollowing returns the list of accounts a given account is following

func (g *Client) GetAccountFollowing(accountID int) ([]Account, error) {

	o := &getAccountsOptions{ID: accountID}

	return g.getMultipleAccounts("following", o)

}

// FollowAccount follows an account

func (g *Client) FollowAccount(accountID int) error {

	account, err := g.getSingleAccount("follow", accountID)

	if err != nil {

		return err

	}

	if account != nil && account.ID != accountID {

		return ErrEntityNotFound

	}

	return nil

}

// UnfollowAccount unfollows an account

func (g *Client) UnfollowAccount(accountID int) error {

	account, err := g.getSingleAccount("unfollow", accountID)

	if err != nil {

		return err

	}

	if account != nil && account.ID != accountID {

		return ErrEntityNotFound

	}

	return nil

}

// FollowRemoteAccount follows a remote account

// The parameter 'uri' is a URI (e.g. "username@domain").

func (g *Client) FollowRemoteAccount(uri string) (*Account, error) {

	if uri == "" {

		return nil, ErrInvalidID

	}

	params := make(apiCallParams)

	params["uri"] = uri

	var account Account

	if err := g.apiCall("follows", rest.Post, params, &account); err != nil {

		return nil, err

	}

	if account.ID == 0 {

		return nil, ErrEntityNotFound

	}

	return &account, nil

}

// BlockAccount blocks an account

func (g *Client) BlockAccount(accountID int) error {

	account, err := g.getSingleAccount("block", accountID)

	if err != nil {

		return err

	}

	if account != nil && account.ID != accountID {

		return ErrEntityNotFound

	}

	return nil

}

// UnblockAccount unblocks an account

func (g *Client) UnblockAccount(accountID int) error {

	account, err := g.getSingleAccount("unblock", accountID)

	if err != nil {

		return err

	}

	if account != nil && account.ID != accountID {

		return ErrEntityNotFound

	}

	return nil

}

// MuteAccount mutes an account

func (g *Client) MuteAccount(accountID int) error {

	account, err := g.getSingleAccount("mute", accountID)

	if err != nil {

		return err

	}

	if account != nil && account.ID != accountID {

		return ErrEntityNotFound

	}

	return nil

}

// UnmuteAccount unmutes an account

func (g *Client) UnmuteAccount(accountID int) error {

	account, err := g.getSingleAccount("unmute", accountID)

	if err != nil {

		return err

	}

	if account != nil && account.ID != accountID {

		return ErrEntityNotFound

	}

	return nil

}

// SearchAccounts returns a list of accounts matching the query string

// The limit parameter is optional (can be 0).

func (g *Client) SearchAccounts(query string, limit int) ([]Account, error) {

	o := &getAccountsOptions{Q: query, Limit: limit}

	return g.getMultipleAccounts("search", o)

}

// GetBlockedAccounts returns the list of blocked accounts

func (g *Client) GetBlockedAccounts() ([]Account, error) {

	return g.getMultipleAccounts("blocks", nil)

}

// GetMutedAccounts returns the list of muted accounts

func (g *Client) GetMutedAccounts() ([]Account, error) {

	return g.getMultipleAccounts("mutes", nil)

}

// GetAccountFollowRequests returns the list of follow requests accounts

func (g *Client) GetAccountFollowRequests() ([]Account, error) {

	return g.getMultipleAccounts("follow_requests", nil)

}

// GetAccountRelationships returns a list of relationship entities for the given accounts

func (g *Client) GetAccountRelationships(accountIDs []int) ([]Relationship, error) {

	if len(accountIDs) < 1 {

		return nil, ErrInvalidID

	}

	params := make(apiCallParams)

	for i, id := range accountIDs {

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

		params[qID] = strconv.Itoa(id)

	}

	var rl []Relationship

	if err := g.apiCall("accounts/relationships", rest.Get, params, &rl); err != nil {

		return nil, err

	}

	return rl, nil

}

// GetAccountStatuses returns a list of status entities for the given account

// If onlyMedia is true, returns only statuses that have media attachments.

// If excludeReplies is true, skip statuses that reply to other statuses.

func (g *Client) GetAccountStatuses(accountID int, onlyMedia, excludeReplies bool) ([]Status, error) {

	if accountID < 1 {

		return nil, ErrInvalidID

	}

	endPoint := "accounts/" + strconv.Itoa(accountID) + "/" + "statuses"

	params := make(apiCallParams)

	if onlyMedia {

		params["only_media"] = "true"

	}

	if excludeReplies {

		params["exclude_replies"] = "true"

	}

	var sl []Status

	if err := g.apiCall(endPoint, rest.Get, params, &sl); err != nil {

		return nil, err

	}

	return sl, nil

}

// FollowRequestAuthorize authorizes or rejects an account follow-request

func (g *Client) FollowRequestAuthorize(accountID int, authorize bool) error {

	endPoint := "follow_requests/reject"

	if authorize {

		endPoint = "follow_requests/authorize"

	}

	_, err := g.getSingleAccount(endPoint, accountID)

	return err

}