// Copyright (c) Ultraviolet
// SPDX-License-Identifier: Apache-2.0
package agent

import (
	"context"
	"encoding/json"
	"fmt"

	"google.golang.org/grpc/metadata"
)

var _ fmt.Stringer = (*Datasets)(nil)

type AgentConfig struct {
	CertFile     string `json:"cert_file,omitempty"`
	KeyFile      string `json:"server_key,omitempty"`
	ServerCAFile string `json:"server_ca_file,omitempty"`
	ClientCAFile string `json:"client_ca_file,omitempty"`
	AttestedTls  bool   `json:"attested_tls,omitempty"`
}

// ResourceSource specifies the location of a remote encrypted resource.
type ResourceSource struct {
	// Type is the type of resource source.
	// Supported values: "oci-image", "s3", "gcs", "https", "http"
	Type string `json:"type,omitempty"`
	// URL is the location of the resource.
	// Examples:
	//   - OCI:   "docker://registry/repo:tag"
	//   - S3:    "s3://bucket/key"
	//   - GCS:   "gs://bucket/key"
	//   - HTTPS: "https://host/path/to/file"
	//   - HTTP:  "http://host/path/to/file"
	URL string `json:"url,omitempty"`
	// KBSResourcePath is the path to the decryption key in KBS (e.g., "default/key/my-key")
	KBSResourcePath string `json:"kbs_resource_path,omitempty"`
	// Encrypted indicates whether the resource is encrypted and requires KBS
	Encrypted bool `json:"encrypted,omitempty"`
}

// KBSConfig holds configuration for Key Broker Service.
type KBSConfig struct {
	// URL is the KBS endpoint (e.g., "https://kbs.example.com")
	URL string `json:"url,omitempty"`
	// Enabled indicates whether to use KBS for key retrieval
	Enabled bool `json:"enabled,omitempty"`
}

type Computation struct {
	ID              string           `json:"id,omitempty"`
	Name            string           `json:"name,omitempty"`
	Description     string           `json:"description,omitempty"`
	Datasets        Datasets         `json:"datasets,omitempty"`
	Algorithm       *Algorithm       `json:"algorithm,omitempty"`
	ResultConsumers []ResultConsumer `json:"result_consumers,omitempty"`
}

type ResultConsumer struct {
	UserKey []byte `json:"user_key,omitempty"`
}

func (d *Datasets) String() string {
	dat, err := json.Marshal(d)
	if err != nil {
		return ""
	}
	return string(dat)
}

type Dataset struct {
	Dataset    []byte          `json:"-"`
	Hash       [32]byte        `json:"hash,omitempty"`
	UserKey    []byte          `json:"user_key,omitempty"`
	Filename   string          `json:"filename,omitempty"`
	Source     *ResourceSource `json:"source,omitempty"` // Optional remote source
	Decompress bool            `json:"decompress,omitempty"`
	KBS        *KBSConfig      `json:"kbs,omitempty"`
}

type Datasets []Dataset

type Algorithm struct {
	Algorithm    []byte          `json:"-"`
	Hash         [32]byte        `json:"hash,omitempty"`
	UserKey      []byte          `json:"user_key,omitempty"`
	Requirements []byte          `json:"-"`
	Source       *ResourceSource `json:"source,omitempty"` // Optional remote source
	AlgoType     string          `json:"algo_type,omitempty"`
	AlgoArgs     []string        `json:"algo_args,omitempty"`
	KBS          *KBSConfig      `json:"kbs,omitempty"`
}

type ManifestIndexKey struct{}

func IndexToContext(ctx context.Context, index int) context.Context {
	return context.WithValue(ctx, ManifestIndexKey{}, index)
}

func IndexFromContext(ctx context.Context) (int, bool) {
	index, ok := ctx.Value(ManifestIndexKey{}).(int)
	return index, ok
}

const DecompressKey = "decompress"

func DecompressFromContext(ctx context.Context) bool {
	vals := metadata.ValueFromIncomingContext(ctx, DecompressKey)
	if len(vals) == 0 {
		return false
	}

	return vals[0] == "true"
}

func DecompressToContext(ctx context.Context, decompress bool) context.Context {
	return metadata.AppendToOutgoingContext(ctx, DecompressKey, fmt.Sprintf("%t", decompress))
}