package acme

import (
	"context"
	"encoding/json"
	"time"
)

// Authorization representst an ACME Authorization.
type Authorization struct {
	Identifier Identifier   `json:"identifier"`
	Status     Status       `json:"status"`
	ExpiresAt  time.Time    `json:"expires"`
	Challenges []*Challenge `json:"challenges"`
	Wildcard   bool         `json:"wildcard"`
	Error      *Error       `json:"error,omitempty"`
	ID         string       `json:"-"`
	AccountID  string       `json:"-"`
	Token      string       `json:"-"`
}

// ToLog enables response logging.
func (az *Authorization) ToLog() (interface{}, error) {
	b, err := json.Marshal(az)
	if err != nil {
		return nil, WrapErrorISE(err, "error marshaling authz for logging")
	}
	return string(b), nil
}

// UpdateStatus updates the ACME Authorization Status if necessary.
// Changes to the Authorization are saved using the database interface.
func (az *Authorization) UpdateStatus(ctx context.Context, db DB) error {
	now := clock.Now()

	switch az.Status {
	case StatusInvalid:
		return nil
	case StatusValid:
		return nil
	case StatusPending:
		// check expiry
		if now.After(az.ExpiresAt) {
			az.Status = StatusInvalid
			break
		}

		var isValid = false
		for _, ch := range az.Challenges {
			if ch.Status == StatusValid {
				isValid = true
				break
			}
		}

		if !isValid {
			return nil
		}
		az.Status = StatusValid
		az.Error = nil
	default:
		return NewErrorISE("unrecognized authorization status: %s", az.Status)
	}

	if err := db.UpdateAuthorization(ctx, az); err != nil {
		return WrapErrorISE(err, "error updating authorization")
	}
	return nil
}