package cloudflare

import (
	"context"
	"fmt"
	"net/http"

	"github.com/goccy/go-json"
)

// FallbackDomainResponse represents the response from the get fallback
// domain endpoints.
type FallbackDomainResponse struct {
	Response
	Result []FallbackDomain `json:"result"`
}

// FallbackDomain represents the individual domain struct.
type FallbackDomain struct {
	Suffix      string   `json:"suffix,omitempty"`
	Description string   `json:"description,omitempty"`
	DNSServer   []string `json:"dns_server,omitempty"`
}

// ListFallbackDomains returns all fallback domains within an account.
//
// API reference: https://api.cloudflare.com/#devices-get-local-domain-fallback-list
func (api *API) ListFallbackDomains(ctx context.Context, accountID string) ([]FallbackDomain, error) {
	uri := fmt.Sprintf("/%s/%s/devices/policy/fallback_domains", AccountRouteRoot, accountID)

	res, err := api.makeRequestContext(ctx, http.MethodGet, uri, nil)
	if err != nil {
		return []FallbackDomain{}, err
	}

	var fallbackDomainResponse FallbackDomainResponse
	err = json.Unmarshal(res, &fallbackDomainResponse)
	if err != nil {
		return []FallbackDomain{}, fmt.Errorf("%s: %w", errUnmarshalError, err)
	}

	return fallbackDomainResponse.Result, nil
}

// ListFallbackDomainsDeviceSettingsPolicy returns all fallback domains within an account for a specific device settings policy.
//
// API reference: https://api.cloudflare.com/#devices-get-local-domain-fallback-list
func (api *API) ListFallbackDomainsDeviceSettingsPolicy(ctx context.Context, accountID, policyID string) ([]FallbackDomain, error) {
	uri := fmt.Sprintf("/%s/%s/devices/policy/%s/fallback_domains", AccountRouteRoot, accountID, policyID)

	res, err := api.makeRequestContext(ctx, http.MethodGet, uri, nil)
	if err != nil {
		return []FallbackDomain{}, err
	}

	var fallbackDomainResponse FallbackDomainResponse
	err = json.Unmarshal(res, &fallbackDomainResponse)
	if err != nil {
		return []FallbackDomain{}, fmt.Errorf("%s: %w", errUnmarshalError, err)
	}

	return fallbackDomainResponse.Result, nil
}

// UpdateFallbackDomain updates the existing fallback domain policy.
//
// API reference: https://api.cloudflare.com/#devices-set-local-domain-fallback-list
func (api *API) UpdateFallbackDomain(ctx context.Context, accountID string, domains []FallbackDomain) ([]FallbackDomain, error) {
	uri := fmt.Sprintf("/%s/%s/devices/policy/fallback_domains", AccountRouteRoot, accountID)

	res, err := api.makeRequestContext(ctx, http.MethodPut, uri, domains)
	if err != nil {
		return []FallbackDomain{}, err
	}

	var fallbackDomainResponse FallbackDomainResponse
	err = json.Unmarshal(res, &fallbackDomainResponse)
	if err != nil {
		return []FallbackDomain{}, fmt.Errorf("%s: %w", errUnmarshalError, err)
	}

	return fallbackDomainResponse.Result, nil
}

// UpdateFallbackDomainDeviceSettingsPolicy updates the existing fallback domain policy for a specific device settings policy.
//
// API reference: https://api.cloudflare.com/#devices-set-local-domain-fallback-list
func (api *API) UpdateFallbackDomainDeviceSettingsPolicy(ctx context.Context, accountID, policyID string, domains []FallbackDomain) ([]FallbackDomain, error) {
	uri := fmt.Sprintf("/%s/%s/devices/policy/%s/fallback_domains", AccountRouteRoot, accountID, policyID)

	res, err := api.makeRequestContext(ctx, http.MethodPut, uri, domains)
	if err != nil {
		return []FallbackDomain{}, err
	}

	var fallbackDomainResponse FallbackDomainResponse
	err = json.Unmarshal(res, &fallbackDomainResponse)
	if err != nil {
		return []FallbackDomain{}, fmt.Errorf("%s: %w", errUnmarshalError, err)
	}

	return fallbackDomainResponse.Result, nil
}

// RestoreFallbackDomainDefaultsDeviceSettingsPolicy resets the domain fallback values to the default
// list for a specific device settings policy.
//
// API reference: TBA.
func (api *API) RestoreFallbackDomainDefaults(ctx context.Context, accountID string) error {
	uri := fmt.Sprintf("/%s/%s/devices/policy/fallback_domains?reset_defaults=true", AccountRouteRoot, accountID)

	_, err := api.makeRequestContext(ctx, http.MethodDelete, uri, []string{})
	if err != nil {
		return err
	}

	return nil
}

// RestoreFallbackDomainDefaults resets the domain fallback values to the default
// list.
//
// API reference: TBA.
func (api *API) RestoreFallbackDomainDefaultsDeviceSettingsPolicy(ctx context.Context, accountID, policyID string) error {
	uri := fmt.Sprintf("/%s/%s/devices/policy/%s/fallback_domains?reset_defaults=true", AccountRouteRoot, accountID, policyID)

	_, err := api.makeRequestContext(ctx, http.MethodDelete, uri, []string{})
	if err != nil {
		return err
	}

	return nil
}