package sdk

import (
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"github.com/mainflux/mainflux/pkg/errors"
)

const (
	usersEndpoint        = "users"
	enableEndpoint       = "enable"
	disableEndpoint      = "disable"
	issueTokenEndpoint   = "tokens/issue"
	refreshTokenEndpoint = "tokens/refresh"
	membersEndpoint      = "members"
)

// User represents mainflux user its credentials.
type User struct {
	ID          string      `json:"id"`
	Name        string      `json:"name,omitempty"`
	Credentials Credentials `json:"credentials"`
	Tags        []string    `json:"tags,omitempty"`
	Owner       string      `json:"owner,omitempty"`
	Metadata    Metadata    `json:"metadata,omitempty"`
	CreatedAt   time.Time   `json:"created_at,omitempty"`
	UpdatedAt   time.Time   `json:"updated_at,omitempty"`
	Status      string      `json:"status,omitempty"`
	Role        string      `json:"role,omitempty"`
}

func (sdk mfSDK) CreateUser(user User, token string) (User, errors.SDKError) {
	data, err := json.Marshal(user)
	if err != nil {
		return User{}, errors.NewSDKError(err)
	}

	url := fmt.Sprintf("%s/%s", sdk.usersURL, usersEndpoint)

	_, body, sdkerr := sdk.processRequest(http.MethodPost, url, token, string(CTJSON), data, http.StatusCreated)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	user = User{}
	if err := json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}

	return user, nil
}

func (sdk mfSDK) Users(pm PageMetadata, token string) (UsersPage, errors.SDKError) {
	url, err := sdk.withQueryParams(sdk.usersURL, usersEndpoint, pm)
	if err != nil {
		return UsersPage{}, errors.NewSDKError(err)
	}

	_, body, sdkerr := sdk.processRequest(http.MethodGet, url, token, string(CTJSON), nil, http.StatusOK)
	if sdkerr != nil {
		return UsersPage{}, sdkerr
	}

	var cp UsersPage
	if err := json.Unmarshal(body, &cp); err != nil {
		return UsersPage{}, errors.NewSDKError(err)
	}

	return cp, nil
}

func (sdk mfSDK) Members(groupID string, meta PageMetadata, token string) (MembersPage, errors.SDKError) {
	url, err := sdk.withQueryParams(sdk.usersURL, fmt.Sprintf("%s/%s/%s", groupsEndpoint, groupID, membersEndpoint), meta)
	if err != nil {
		return MembersPage{}, errors.NewSDKError(err)
	}

	_, body, sdkerr := sdk.processRequest(http.MethodGet, url, token, string(CTJSON), nil, http.StatusOK)
	if sdkerr != nil {
		return MembersPage{}, sdkerr
	}

	var mp MembersPage
	if err := json.Unmarshal(body, &mp); err != nil {
		return MembersPage{}, errors.NewSDKError(err)
	}

	return mp, nil
}

func (sdk mfSDK) User(id, token string) (User, errors.SDKError) {
	url := fmt.Sprintf("%s/%s/%s", sdk.usersURL, usersEndpoint, id)

	_, body, sdkerr := sdk.processRequest(http.MethodGet, url, token, string(CTJSON), nil, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	var user User
	if err := json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}

	return user, nil
}

func (sdk mfSDK) UserProfile(token string) (User, errors.SDKError) {
	url := fmt.Sprintf("%s/%s/profile", sdk.usersURL, usersEndpoint)

	_, body, sdkerr := sdk.processRequest(http.MethodGet, url, token, string(CTJSON), nil, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	var user User
	if err := json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}

	return user, nil
}

func (sdk mfSDK) UpdateUser(user User, token string) (User, errors.SDKError) {
	data, err := json.Marshal(user)
	if err != nil {
		return User{}, errors.NewSDKError(err)
	}

	url := fmt.Sprintf("%s/%s/%s", sdk.usersURL, usersEndpoint, user.ID)

	_, body, sdkerr := sdk.processRequest(http.MethodPatch, url, token, string(CTJSON), data, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	user = User{}
	if err := json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}
	
	return user, nil
}

func (sdk mfSDK) UpdateUserTags(user User, token string) (User, errors.SDKError) {
	data, err := json.Marshal(user)
	if err != nil {
		return User{}, errors.NewSDKError(err)
	}

	url := fmt.Sprintf("%s/%s/%s/tags", sdk.usersURL, usersEndpoint, user.ID)

	_, body, sdkerr := sdk.processRequest(http.MethodPatch, url, token, string(CTJSON), data, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	user = User{}
	if err := json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}
	
	return user, nil
}

func (sdk mfSDK) UpdateUserIdentity(user User, token string) (User, errors.SDKError) {
	ucir := updateClientIdentityReq{token: token, id: user.ID, Identity: user.Credentials.Identity}

	data, err := json.Marshal(ucir)
	if err != nil {
		return User{}, errors.NewSDKError(err)
	}

	url := fmt.Sprintf("%s/%s/%s/identity", sdk.usersURL, usersEndpoint, user.ID)

	_, body, sdkerr := sdk.processRequest(http.MethodPatch, url, token, string(CTJSON), data, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	user = User{}
	if err := json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}

	return user, nil
}

func (sdk mfSDK) UpdatePassword(oldPass, newPass, token string) (User, errors.SDKError) {
	var ucsr = updateClientSecretReq{OldSecret: oldPass, NewSecret: newPass}

	data, err := json.Marshal(ucsr)
	if err != nil {
		return User{}, errors.NewSDKError(err)
	}

	url := fmt.Sprintf("%s/%s/secret", sdk.usersURL, usersEndpoint)

	_, body, sdkerr := sdk.processRequest(http.MethodPatch, url, token, string(CTJSON), data, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	var user User
	if err = json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}

	return user, nil
}

func (sdk mfSDK) UpdateUserOwner(user User, token string) (User, errors.SDKError) {
	data, err := json.Marshal(user)
	if err != nil {
		return User{}, errors.NewSDKError(err)
	}

	url := fmt.Sprintf("%s/%s/%s/owner", sdk.usersURL, usersEndpoint, user.ID)

	_, body, sdkerr := sdk.processRequest(http.MethodPatch, url, token, string(CTJSON), data, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	user = User{}
	if err = json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}

	return user, nil
}

func (sdk mfSDK) EnableUser(id, token string) (User, errors.SDKError) {
	return sdk.changeClientStatus(token, id, enableEndpoint)
}

func (sdk mfSDK) DisableUser(id, token string) (User, errors.SDKError) {
	return sdk.changeClientStatus(token, id, disableEndpoint)
}

func (sdk mfSDK) changeClientStatus(token, id, status string) (User, errors.SDKError) {
	url := fmt.Sprintf("%s/%s/%s/%s", sdk.usersURL, usersEndpoint, id, status)
	_, body, sdkerr := sdk.processRequest(http.MethodPost, url, token, string(CTJSON), nil, http.StatusOK)
	if sdkerr != nil {
		return User{}, sdkerr
	}

	user := User{}
	if err := json.Unmarshal(body, &user); err != nil {
		return User{}, errors.NewSDKError(err)
	}

	return user, nil
}