/*
 * VM Auto Scaling API
 *
 * The VM Auto Scaling Service enables IONOS clients to horizontally scale the number of VM replicas based on configured rules. You can use VM Auto Scaling to ensure that you have a sufficient number of replicas to handle your application loads at all times.  For this purpose, create a VM Auto Scaling Group that contains the server replicas. The VM Auto Scaling Service ensures that the number of replicas in the group is always within the defined limits.   When scaling policies are set, VM Auto Scaling creates or deletes replicas according to the requirements of your applications. For each policy, specified 'scale-in' and 'scale-out' actions are performed when the corresponding thresholds are reached.
 *
 * API version: 1-SDK.1
 * Contact: support@cloud.ionos.com
 */

// Code generated by OpenAPI Generator (https://openapi-generator.tech); DO NOT EDIT.

package ionoscloud

import (
	"context"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"strings"
	"time"
)

const (
	IonosUsernameEnvVar   = "IONOS_USERNAME"
	IonosPasswordEnvVar   = "IONOS_PASSWORD"
	IonosTokenEnvVar      = "IONOS_TOKEN"
	IonosApiUrlEnvVar     = "IONOS_API_URL"
	IonosPinnedCertEnvVar = "IONOS_PINNED_CERT"
	IonosLogLevelEnvVar   = "IONOS_LOG_LEVEL"
	DefaultIonosServerUrl = "https://api.ionos.com/autoscaling"
	DefaultIonosBasePath  = "/autoscaling"
	defaultMaxRetries     = 3
	defaultWaitTime       = time.Duration(100) * time.Millisecond
	defaultMaxWaitTime    = time.Duration(2000) * time.Millisecond
)

// contextKeys are used to identify the type of value in the context.
// Since these are string, it is possible to get a short description of the
// context key for logging and debugging using key.String().

type contextKey string

func (c contextKey) String() string {
	return "auth " + string(c)
}

var (
	// ContextOAuth2 takes an oauth2.TokenSource as authentication for the request.
	ContextOAuth2 = contextKey("token")

	// ContextBasicAuth takes BasicAuth as authentication for the request.
	ContextBasicAuth = contextKey("basic")

	// ContextAccessToken takes a string oauth2 access token as authentication for the request.
	ContextAccessToken = contextKey("accesstoken")

	// ContextAPIKeys takes a string apikey as authentication for the request
	ContextAPIKeys = contextKey("apiKeys")

	// ContextHttpSignatureAuth takes HttpSignatureAuth as authentication for the request.
	ContextHttpSignatureAuth = contextKey("httpsignature")

	// ContextServerIndex uses a server configuration from the index.
	ContextServerIndex = contextKey("serverIndex")

	// ContextOperationServerIndices uses a server configuration from the index mapping.
	ContextOperationServerIndices = contextKey("serverOperationIndices")

	// ContextServerVariables overrides a server configuration variables.
	ContextServerVariables = contextKey("serverVariables")

	// ContextOperationServerVariables overrides a server configuration variables using operation specific values.
	ContextOperationServerVariables = contextKey("serverOperationVariables")
)

// BasicAuth provides basic http authentication to a request passed via context using ContextBasicAuth
type BasicAuth struct {
	UserName string `json:"userName,omitempty"`
	Password string `json:"password,omitempty"`
}

// APIKey provides API key based authentication to a request passed via context using ContextAPIKey
type APIKey struct {
	Key    string
	Prefix string
}

// ServerVariable stores the information about a server variable
type ServerVariable struct {
	Description  string
	DefaultValue string
	EnumValues   []string
}

// ServerConfiguration stores the information about a server
type ServerConfiguration struct {
	URL         string
	Description string
	Variables   map[string]ServerVariable
}

// ServerConfigurations stores multiple ServerConfiguration items
type ServerConfigurations []ServerConfiguration

// Configuration stores the configuration of the API client
type Configuration struct {
	Host               string            `json:"host,omitempty"`
	Scheme             string            `json:"scheme,omitempty"`
	DefaultHeader      map[string]string `json:"defaultHeader,omitempty"`
	DefaultQueryParams url.Values        `json:"defaultQueryParams,omitempty"`
	UserAgent          string            `json:"userAgent,omitempty"`
	Debug              bool              `json:"debug,omitempty"`
	Servers            ServerConfigurations
	OperationServers   map[string]ServerConfigurations
	HTTPClient         *http.Client
	LogLevel           LogLevel
	Logger             Logger
	Username           string        `json:"username,omitempty"`
	Password           string        `json:"password,omitempty"`
	Token              string        `json:"token,omitempty"`
	MaxRetries         int           `json:"maxRetries,omitempty"`
	WaitTime           time.Duration `json:"waitTime,omitempty"`
	MaxWaitTime        time.Duration `json:"maxWaitTime,omitempty"`
}

// NewConfiguration returns a new Configuration object
func NewConfiguration(username, password, token, hostUrl string) *Configuration {
	cfg := &Configuration{
		DefaultHeader:      make(map[string]string),
		DefaultQueryParams: url.Values{},
		UserAgent:          "ionos-cloud-sdk-go-vm-autoscaling/v1.0.1",
		Debug:              false,
		Username:           username,
		Password:           password,
		Token:              token,
		MaxRetries:         defaultMaxRetries,
		MaxWaitTime:        defaultMaxWaitTime,
		WaitTime:           defaultWaitTime,
		Logger:             NewDefaultLogger(),
		LogLevel:           getLogLevelFromEnv(),
		Servers: ServerConfigurations{
			{
				URL:         getServerUrl(hostUrl),
				Description: "Production",
			},
		},
		OperationServers: map[string]ServerConfigurations{},
	}
	return cfg
}

func NewConfigurationFromEnv() *Configuration {
	return NewConfiguration(os.Getenv(IonosUsernameEnvVar), os.Getenv(IonosPasswordEnvVar), os.Getenv(IonosTokenEnvVar), os.Getenv(IonosApiUrlEnvVar))
}

// AddDefaultHeader adds a new HTTP header to the default header in the request
func (c *Configuration) AddDefaultHeader(key string, value string) {
	c.DefaultHeader[key] = value
}

func (c *Configuration) AddDefaultQueryParam(key string, value string) {
	c.DefaultQueryParams[key] = []string{value}
}

// URL formats template on a index using given variables
func (sc ServerConfigurations) URL(index int, variables map[string]string) (string, error) {
	if index < 0 || len(sc) <= index {
		return "", fmt.Errorf("Index %v out of range %v", index, len(sc)-1)
	}
	server := sc[index]
	url := server.URL

	// go through variables and replace placeholders
	for name, variable := range server.Variables {
		if value, ok := variables[name]; ok {
			found := bool(len(variable.EnumValues) == 0)
			for _, enumValue := range variable.EnumValues {
				if value == enumValue {
					found = true
				}
			}
			if !found {
				return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
			}
			url = strings.Replace(url, "{"+name+"}", value, -1)
		} else {
			url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
		}
	}
	return url, nil
}

// ServerURL returns URL based on server settings
func (c *Configuration) ServerURL(index int, variables map[string]string) (string, error) {
	return c.Servers.URL(index, variables)
}

func getServerIndex(ctx context.Context) (int, error) {
	si := ctx.Value(ContextServerIndex)
	if si != nil {
		if index, ok := si.(int); ok {
			return index, nil
		}
		return 0, reportError("Invalid type %T should be int", si)
	}
	return 0, nil
}

func getServerOperationIndex(ctx context.Context, endpoint string) (int, error) {
	osi := ctx.Value(ContextOperationServerIndices)
	if osi != nil {
		if operationIndices, ok := osi.(map[string]int); !ok {
			return 0, reportError("Invalid type %T should be map[string]int", osi)
		} else {
			index, ok := operationIndices[endpoint]
			if ok {
				return index, nil
			}
		}
	}
	return getServerIndex(ctx)
}

func getServerVariables(ctx context.Context) (map[string]string, error) {
	sv := ctx.Value(ContextServerVariables)
	if sv != nil {
		if variables, ok := sv.(map[string]string); ok {
			return variables, nil
		}
		return nil, reportError("ctx value of ContextServerVariables has invalid type %T should be map[string]string", sv)
	}
	return nil, nil
}

func getServerOperationVariables(ctx context.Context, endpoint string) (map[string]string, error) {
	osv := ctx.Value(ContextOperationServerVariables)
	if osv != nil {
		if operationVariables, ok := osv.(map[string]map[string]string); !ok {
			return nil, reportError("ctx value of ContextOperationServerVariables has invalid type %T should be map[string]map[string]string", osv)
		} else {
			variables, ok := operationVariables[endpoint]
			if ok {
				return variables, nil
			}
		}
	}
	return getServerVariables(ctx)
}

func getServerUrl(serverUrl string) string {
	if serverUrl == "" {
		return DefaultIonosServerUrl
	}
	// Support both HTTPS & HTTP schemas
	if !strings.HasPrefix(serverUrl, "https://") && !strings.HasPrefix(serverUrl, "http://") {
		serverUrl = fmt.Sprintf("https://%s", serverUrl)
	}
	if !strings.HasSuffix(serverUrl, DefaultIonosBasePath) {
		serverUrl = fmt.Sprintf("%s%s", serverUrl, DefaultIonosBasePath)
	}
	return serverUrl
}

// ServerURLWithContext returns a new server URL given an endpoint
func (c *Configuration) ServerURLWithContext(ctx context.Context, endpoint string) (string, error) {
	sc, ok := c.OperationServers[endpoint]
	if !ok {
		sc = c.Servers
	}

	if ctx == nil {
		return sc.URL(0, nil)
	}

	index, err := getServerOperationIndex(ctx, endpoint)
	if err != nil {
		return "", err
	}

	variables, err := getServerOperationVariables(ctx, endpoint)
	if err != nil {
		return "", err
	}

	return sc.URL(index, variables)
}
