package api

import "time"

// Deployment states, as they appear on the wire.
const (
	StatePending   = "pending"
	StateUploading = "uploading"
	StateReady     = "ready"
	StateFailed    = "failed"
	StateDeleting  = "deleting"
)

// Key scopes, as they appear on the wire.
const (
	ScopeAdmin   = "admin"
	ScopeProject = "project"
)

// ---------------------------------------------------------------- projects

// Project is the server's view of a project.
//
// Every mutable setting also appears in ProjectPatch. Adding a field here that
// cannot be changed afterwards is a deliberate choice, not an oversight: Name
// is immutable because renaming would invalidate every deployed URL and every
// webroot symlink pointing at it.
type Project struct {
	Name         string `json:"name"`
	DisplayName  string `json:"display_name,omitempty"`
	IndexFile    string `json:"index_file"`
	NotFoundFile string `json:"not_found_file,omitempty"`
	SPAFallback  bool   `json:"spa_fallback"`
	CacheControl string `json:"cache_control"`

	RetentionCount int   `json:"retention_count"`
	RetentionGrace int   `json:"retention_grace_s"`
	MaxFiles       int   `json:"max_files"`
	MaxFileBytes   int64 `json:"max_file_bytes"`
	MaxTotalBytes  int64 `json:"max_total_bytes"`

	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`

	// ActiveDeployment is nil when the project has never been deployed, which
	// is why it is a pointer rather than a zero-valued struct.
	ActiveDeployment *Deployment `json:"active_deployment,omitempty"`
	// URL is where the active deployment is served, when the server knows its
	// public base URL.
	URL string `json:"url,omitempty"`
}

// CreateProjectRequest creates a project. Everything except Name is optional
// and falls back to the server's defaults.
type CreateProjectRequest struct {
	Name  string        `json:"name"`
	Patch *ProjectPatch `json:"config,omitempty"`
}

// ProjectPatch is a partial update.
//
// Every field is a pointer so the server can tell "leave this alone" from "set
// this to the zero value" — without that, PATCH could never clear a custom 404
// document or turn the SPA fallback off.
type ProjectPatch struct {
	DisplayName    *string `json:"display_name,omitempty"`
	IndexFile      *string `json:"index_file,omitempty"`
	NotFoundFile   *string `json:"not_found_file,omitempty"`
	SPAFallback    *bool   `json:"spa_fallback,omitempty"`
	CacheControl   *string `json:"cache_control,omitempty"`
	RetentionCount *int    `json:"retention_count,omitempty"`
	RetentionGrace *int    `json:"retention_grace_s,omitempty"`
	MaxFiles       *int    `json:"max_files,omitempty"`
	MaxFileBytes   *int64  `json:"max_file_bytes,omitempty"`
	MaxTotalBytes  *int64  `json:"max_total_bytes,omitempty"`
}

// ProjectList is the paged response for GET /api/v1/projects.
type ProjectList struct {
	Projects   []Project `json:"projects"`
	NextCursor string    `json:"next_cursor,omitempty"`
}

// -------------------------------------------------------------------- keys

// Key describes an API key. It never carries the secret: the full token exists
// on the wire exactly once, in CreateKeyResponse.
type Key struct {
	ID        string     `json:"id"`
	Scope     string     `json:"scope"`
	Project   string     `json:"project,omitempty"`
	Name      string     `json:"name,omitempty"`
	CreatedAt time.Time  `json:"created_at"`
	ExpiresAt *time.Time `json:"expires_at,omitempty"`
	LastUsed  *time.Time `json:"last_used_at,omitempty"`
	RevokedAt *time.Time `json:"revoked_at,omitempty"`
}

// Revoked reports whether the key has been revoked.
func (k Key) Revoked() bool { return k.RevokedAt != nil }

// CreateKeyRequest mints a key. Project is set by the URL for the
// project-scoped endpoint and must be empty otherwise.
type CreateKeyRequest struct {
	Name string `json:"name,omitempty"`
	// ExpiresAt is absolute, not a duration: the CLI parses "90d" locally so a
	// clock skew between client and server cannot silently shift expiry.
	ExpiresAt *time.Time `json:"expires_at,omitempty"`
}

// CreateKeyResponse is the only place a full token ever appears.
type CreateKeyResponse struct {
	Key Key `json:"key"`
	// Token is shown once and never retrievable again. Clients must not log it.
	Token string `json:"token"`
}

// KeyList is the response for the key listing endpoints.
type KeyList struct {
	Keys []Key `json:"keys"`
}

// WhoAmI describes the caller's own credential.
type WhoAmI struct {
	KeyID     string     `json:"key_id"`
	Scope     string     `json:"scope"`
	Project   string     `json:"project,omitempty"`
	Name      string     `json:"name,omitempty"`
	ExpiresAt *time.Time `json:"expires_at,omitempty"`
}

// ------------------------------------------------------------- deployments

// Deployment is the server's view of one upload.
type Deployment struct {
	ID         string            `json:"id"`
	Project    string            `json:"project"`
	State      string            `json:"state"`
	Active     bool              `json:"active"`
	FileCount  int               `json:"file_count"`
	TotalBytes int64             `json:"total_bytes"`
	Meta       map[string]string `json:"meta,omitempty"`
	Error      string            `json:"error,omitempty"`

	CreatedAt   time.Time  `json:"created_at"`
	FinalizedAt *time.Time `json:"finalized_at,omitempty"`
	ActivatedAt *time.Time `json:"activated_at,omitempty"`

	// URL is where this deployment is served, set on the response to an
	// activation when the server knows its public base URL. It is the project's
	// URL: only the active deployment has one, since there are no per-version
	// preview addresses.
	URL string `json:"url,omitempty"`

	// Files is populated only by GET .../deployments/{id}?files=true.
	Files []FileEntry `json:"files,omitempty"`
}

// FileEntry is one line of a manifest. Digest is lowercase hex; the server
// stores the raw 32 bytes, and hex exists only at this boundary.
type FileEntry struct {
	Path   string `json:"path"`
	Digest string `json:"digest"`
	Size   int64  `json:"size"`
}

// CreateDeploymentRequest starts a deployment.
type CreateDeploymentRequest struct {
	Meta map[string]string `json:"meta,omitempty"`
}

// ManifestRequest declares the complete file list of a deployment.
type ManifestRequest struct {
	Files []FileEntry `json:"files"`
}

// ManifestResponse tells the client which blobs the server does not have yet.
//
// Missing is the number that makes content-addressed upload worth having, so
// the CLI prints it: "142 files, 3.1 MiB; 11 new blobs, 402 KiB to upload".
type ManifestResponse struct {
	Missing      []string `json:"missing"`
	MissingBytes int64    `json:"missing_bytes"`
	Have         int      `json:"have"`
	FileCount    int      `json:"file_count"`
	TotalBytes   int64    `json:"total_bytes"`
}

// BlobResponse acknowledges an uploaded blob.
type BlobResponse struct {
	Digest string `json:"digest"`
	Size   int64  `json:"size"`
}

// DeploymentList is the paged response for the deployment listing endpoint.
type DeploymentList struct {
	Deployments []Deployment `json:"deployments"`
	NextCursor  string       `json:"next_cursor,omitempty"`
}

// ------------------------------------------------------------------ system

// SystemInfo is the response for GET /api/v1/system/info.
type SystemInfo struct {
	Version     string `json:"version"`
	UptimeS     int64  `json:"uptime_s"`
	Projects    int64  `json:"projects"`
	Deployments int64  `json:"deployments"`
	Blobs       int64  `json:"blobs"`
	CASBytes    int64  `json:"cas_bytes"`
	LinkMode    string `json:"link_mode"`
	SchemaVer   int    `json:"schema_version"`
}

// GCRequest asks for a garbage collection pass.
type GCRequest struct {
	DryRun bool `json:"dry_run,omitempty"`
}

// GCStats reports what a collection pass did, or would have done.
//
// On a dry run the blob numbers count what is collectable right now, not what
// deleting the listed deployments would additionally free: nothing was deleted,
// so those blobs are still referenced. The figures are a floor.
type GCStats struct {
	DryRun             bool  `json:"dry_run"`
	DeploymentsDeleted int   `json:"deployments_deleted"`
	BlobsDeleted       int   `json:"blobs_deleted"`
	BytesFreed         int64 `json:"bytes_freed"`
}

// FsckRequest asks for a consistency check, optionally correcting what it
// finds.
type FsckRequest struct {
	Repair bool `json:"repair,omitempty"`
}

// FsckReport is the result of a consistency check.
type FsckReport struct {
	// Blobs is how many were examined, DriftCount how many disagreed with the
	// manifests that reference them. Drift lists the first hundred of them,
	// because the list is for a person to read.
	Blobs      int64       `json:"blobs"`
	DriftCount int         `json:"drift_count"`
	Drift      []BlobDrift `json:"drift,omitempty"`
	Repaired   int         `json:"repaired"`
}

// BlobDrift is one blob whose stored reference count is not the number of
// manifest entries that name it.
type BlobDrift struct {
	Digest string `json:"digest"`
	// Stored above Actual only wastes disk. Stored below Actual is the
	// dangerous direction: the collector may remove content a deployment still
	// needs.
	Stored int64 `json:"stored"`
	Actual int64 `json:"actual"`
}