package services

import (
	"github.com/mitchellh/mapstructure"
	"github.com/rackspace/gophercloud"
	"github.com/rackspace/gophercloud/pagination"
)

// Domain represents a domain used by users to access their website.
type Domain struct {
	// Specifies the domain used to access the assets on their website, for which
	// a CNAME is given to the CDN provider.
	Domain string `mapstructure:"domain"`
	// Specifies the protocol used to access the assets on this domain. Only "http"
	// or "https" are currently allowed. The default is "http".
	Protocol string `mapstructure:"protocol"`
}

// OriginRule represents a rule that defines when an origin should be accessed.
type OriginRule struct {
	// Specifies the name of this rule.
	Name string `mapstructure:"name"`
	// Specifies the request URL this rule should match for this origin to be used. Regex is supported.
	RequestURL string `mapstructure:"request_url"`
}

// Origin specifies a list of origin domains or IP addresses where the original assets are stored.
type Origin struct {
	// Specifies the URL or IP address to pull origin content from.
	Origin string `mapstructure:"origin"`
	// Specifies the port used to access the origin. The default is port 80.
	Port int `mapstructure:"port"`
	// Specifies whether or not to use HTTPS to access the origin. The default
	// is false.
	SSL bool `mapstructure:"ssl"`
	// Specifies a collection of rules that define the conditions when this origin
	// should be accessed. If there is more than one origin, the rules parameter is required.
	Rules []OriginRule `mapstructure:"rules"`
}

// CacheRule specifies a rule that determines if a TTL should be applied to an asset.
type CacheRule struct {
	// Specifies the name of this rule.
	Name string `mapstructure:"name"`
	// Specifies the request URL this rule should match for this TTL to be used. Regex is supported.
	RequestURL string `mapstructure:"request_url"`
}

// Cache specifies the TTL rules for the assets under this service.
type Cache struct {
	// Specifies the name of this caching rule. Note: 'default' is a reserved name used for the default TTL setting.
	Name string `mapstructure:"name"`
	// Specifies the TTL to apply.
	TTL int `mapstructure:"ttl"`
	// Specifies a collection of rules that determine if this TTL should be applied to an asset.
	Rules []CacheRule `mapstructure:"rules"`
}

// RestrictionRule specifies a rule that determines if this restriction should be applied to an asset.
type RestrictionRule struct {
	// Specifies the name of this rule.
	Name string `mapstructure:"name"`
	// Specifies the http host that requests must come from.
	Referrer string `mapstructure:"referrer"`
}

// Restriction specifies a restriction that defines who can access assets (content from the CDN cache).
type Restriction struct {
	// Specifies the name of this restriction.
	Name string `mapstructure:"name"`
	// Specifies a collection of rules that determine if this TTL should be applied to an asset.
	Rules []RestrictionRule `mapstructure:"rules"`
}

// Error specifies an error that occurred during the previous service action.
type Error struct {
	// Specifies an error message detailing why there is an error.
	Message string `mapstructure:"message"`
}

// Service represents a CDN service resource.
type Service struct {
	// Specifies the service ID that represents distributed content. The value is
	// a UUID, such as 96737ae3-cfc1-4c72-be88-5d0e7cc9a3f0, that is generated by the server.
	ID string `mapstructure:"id"`
	// Specifies the name of the service.
	Name string `mapstructure:"name"`
	// Specifies a list of domains used by users to access their website.
	Domains []Domain `mapstructure:"domains"`
	// Specifies a list of origin domains or IP addresses where the original assets are stored.
	Origins []Origin `mapstructure:"origins"`
	// Specifies the TTL rules for the assets under this service. Supports wildcards for fine grained control.
	Caching []Cache `mapstructure:"caching"`
	// Specifies the restrictions that define who can access assets (content from the CDN cache).
	Restrictions []Restriction `mapstructure:"restrictions"`
	// Specifies the CDN provider flavor ID to use. For a list of flavors, see the operation to list the available flavors.
	FlavorID string `mapstructure:"flavor_id"`
	// Specifies the current status of the service.
	Status string `mapstructure:"status"`
	// Specifies the list of errors that occurred during the previous service action.
	Errors []Error `mapstructure:"errors"`
	// Specifies the self-navigating JSON document paths.
	Links []gophercloud.Link `mapstructure:"links"`
}

// ServicePage is the page returned by a pager when traversing over a
// collection of CDN services.
type ServicePage struct {
	pagination.MarkerPageBase
}

// IsEmpty returns true if a ListResult contains no services.
func (r ServicePage) IsEmpty() (bool, error) {
	services, err := ExtractServices(r)
	if err != nil {
		return true, err
	}
	return len(services) == 0, nil
}

// LastMarker returns the last service in a ListResult.
func (r ServicePage) LastMarker() (string, error) {
	services, err := ExtractServices(r)
	if err != nil {
		return "", err
	}
	if len(services) == 0 {
		return "", nil
	}
	return (services[len(services)-1]).ID, nil
}

// ExtractServices is a function that takes a ListResult and returns the services' information.
func ExtractServices(page pagination.Page) ([]Service, error) {
	untyped := page.(ServicePage).Body.([]interface{})
	results := make([]Service, len(untyped))
	for index, each := range untyped {
		service := each.(map[string]interface{})
		err := mapstructure.Decode(service, &results[index])
		if err != nil {
			return results, err
		}
	}
	return results, nil
}

// CreateResult represents the result of a Create operation.
type CreateResult struct {
	gophercloud.HeaderResult
}

// Extract is a method that extracts the location of a newly created service.
func (cr CreateResult) Extract() string {
	return cr.Header["Location"][0]
}

// GetResult represents the result of a get operation.
type GetResult struct {
	gophercloud.Result
}

// Extract is a function that extracts a service from a GetResult.
func (r GetResult) Extract() (*Service, error) {
	if r.Err != nil {
		return nil, r.Err
	}

	var res Service

	err := mapstructure.Decode(r.Body, &res)

	return &res, err
}

// UpdateResult represents the result of a Update operation.
type UpdateResult struct {
	gophercloud.HeaderResult
}

// Extract is a method that extracts the location of an updated service.
func (ur UpdateResult) Extract() string {
	return ur.Header["Location"][0]
}

// DeleteResult represents the result of a Delete operation.
type DeleteResult struct {
	gophercloud.ErrResult
}