package store

import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"

	"github.com/grafana/grafana/pkg/services/featuremgmt"
	"github.com/grafana/grafana/pkg/setting"
)

// For now this file is stored in $GRAFANA_HOME/conf/storage.json and updated from the UI
type GlobalStorageConfig struct {
	filepath string // Local file path

	// Defined in grafana.ini
	AllowUnsanitizedSvgUpload bool `json:"allowUnsanitizedSvgUpload"`

	// Add dev environment
	AddDevEnv bool `json:"addDevEnv"`

	// Paths under 'root' (NOTE: this is applied to all orgs)
	Roots []RootStorageConfig `json:"roots"`
}

func LoadStorageConfig(cfg *setting.Cfg, features featuremgmt.FeatureToggles) (*GlobalStorageConfig, error) {
	changed := false
	fpath := filepath.Join(cfg.DataPath, "storage", "storage.json")
	g := &GlobalStorageConfig{}
	if _, err := os.Stat(fpath); err == nil {
		// nolint:gosec
		// We can ignore the gosec G304 warning since the path is hardcoded above
		body, err := os.ReadFile(fpath)
		if err != nil {
			return g, err
		}
		err = json.Unmarshal(body, g)
		if err != nil {
			return g, err
		}
	} else {
		g.AddDevEnv = true
		changed = true
	}

	g.filepath = fpath

	// Also configured from ini files
	if cfg.Storage.AllowUnsanitizedSvgUpload {
		g.AllowUnsanitizedSvgUpload = true
	}

	// Save a template version in config
	if changed && cfg.Env != setting.Prod {
		return g, g.save()
	}
	return g, nil
}

func (c *GlobalStorageConfig) save() error {
	out, err := json.MarshalIndent(c, "", "  ")
	if err != nil {
		return err
	}
	err = os.MkdirAll(filepath.Dir(c.filepath), 0700)
	if err != nil {
		return err
	}
	return os.WriteFile(c.filepath, out, 0600)
}

type RootStorageConfig struct {
	Type             string `json:"type"`
	Prefix           string `json:"prefix"`
	UnderContentRoot bool   `json:"underContentRoot"`
	Name             string `json:"name"`
	Description      string `json:"description"`
	Disabled         bool   `json:"disabled,omitempty"`

	// Depending on type, these will be configured
	Disk *StorageLocalDiskConfig `json:"disk,omitempty"`
	Git  *StorageGitConfig       `json:"git,omitempty"`
	SQL  *StorageSQLConfig       `json:"sql,omitempty"`
	S3   *StorageS3Config        `json:"s3,omitempty"`
	GCS  *StorageGCSConfig       `json:"gcs,omitempty"`
}

type StorageLocalDiskConfig struct {
	Path  string   `json:"path"`
	Roots []string `json:"roots,omitempty"` // null is everything
}

type StorageGitConfig struct {
	Remote string `json:"remote"`
	Branch string `json:"branch"`
	Root   string `json:"root"` // subfolder within the remote

	// Pull interval?
	// Requires pull request?
	RequirePullRequest bool   `json:"requirePullRequest"`
	PullInterval       string `json:"pullInterval"`

	// SECURE JSON :grimicing:
	AccessToken string `json:"accessToken,omitempty"` // Simplest auth method for github
}

type StorageSQLConfig struct {
	// SQLStorage will prefix all paths with orgId for isolation between orgs
}

type StorageS3Config struct {
	Bucket string `json:"bucket"`
	Folder string `json:"folder"`

	// SECURE!!!
	AccessKey string `json:"accessKey"`
	SecretKey string `json:"secretKey"`
	Region    string `json:"region"`
}

type StorageGCSConfig struct {
	Bucket string `json:"bucket"`
	Folder string `json:"folder"`

	CredentialsFile string `json:"credentialsFile"`
}

func newStorage(cfg RootStorageConfig, localWorkCache string) (storageRuntime, error) {
	switch cfg.Type {
	case rootStorageTypeDisk:
		return newDiskStorage(RootStorageMeta{}, cfg), nil
	}

	return nil, fmt.Errorf("unsupported store: " + cfg.Type)
}