const (
	// Possible values for AlertState.
	AlertStateFiring   AlertState = "firing"
	AlertStateInactive AlertState = "inactive"
	AlertStatePending  AlertState = "pending"

	// Possible values for ErrorType.
	ErrBadData     ErrorType = "bad_data"
	ErrTimeout     ErrorType = "timeout"
	ErrCanceled    ErrorType = "canceled"
	ErrExec        ErrorType = "execution"
	ErrBadResponse ErrorType = "bad_response"
	ErrServer      ErrorType = "server_error"
	ErrClient      ErrorType = "client_error"

	// Possible values for HealthStatus.
	HealthGood    HealthStatus = "up"
	HealthUnknown HealthStatus = "unknown"
	HealthBad     HealthStatus = "down"

	// Possible values for RuleType.
	RuleTypeRecording RuleType = "recording"
	RuleTypeAlerting  RuleType = "alerting"

	// Possible values for RuleHealth.
	RuleHealthGood    = "ok"
	RuleHealthUnknown = "unknown"
	RuleHealthBad     = "err"
)

type API interface {
	// Alerts returns a list of all active alerts.
	Alerts(ctx context.Context) (AlertsResult, error)
	// AlertManagers returns an overview of the current state of the Prometheus alert manager discovery.
	AlertManagers(ctx context.Context) (AlertManagersResult, error)
	// CleanTombstones removes the deleted data from disk and cleans up the existing tombstones.
	CleanTombstones(ctx context.Context) error
	// Config returns the current Prometheus configuration.
	Config(ctx context.Context) (ConfigResult, error)
	// DeleteSeries deletes data for a selection of series in a time range.
	DeleteSeries(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) error
	// Flags returns the flag values that Prometheus was launched with.
	Flags(ctx context.Context) (FlagsResult, error)
	// LabelValues performs a query for the values of the given label.
	LabelValues(ctx context.Context, label string) (model.LabelValues, error)
	// Query performs a query for the given time.
	Query(ctx context.Context, query string, ts time.Time) (model.Value, error)
	// QueryRange performs a query for the given range.
	QueryRange(ctx context.Context, query string, r Range) (model.Value, error)
	// Series finds series by label matchers.
	Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, error)
	// Snapshot creates a snapshot of all current data into snapshots/<datetime>-<rand>
	// under the TSDB's data directory and returns the directory as response.
	Snapshot(ctx context.Context, skipHead bool) (SnapshotResult, error)
	// Rules returns a list of alerting and recording rules that are currently loaded.
	Rules(ctx context.Context) (RulesResult, error)
	// Targets returns an overview of the current state of the Prometheus target discovery.
	Targets(ctx context.Context) (TargetsResult, error)
}

type ActiveTarget struct {
	DiscoveredLabels map[string]string `json:"discoveredLabels"`
	Labels           model.LabelSet    `json:"labels"`
	ScrapeURL        string            `json:"scrapeUrl"`
	LastError        string            `json:"lastError"`
	LastScrape       time.Time         `json:"lastScrape"`
	Health           HealthStatus      `json:"health"`
}

type Alert struct {
	ActiveAt    time.Time `json:"activeAt"`
	Annotations model.LabelSet
	Labels      model.LabelSet
	State       AlertState
	Value       float64
}

type AlertManager struct {
	URL string `json:"url"`
}

type AlertManagersResult struct {
	Active  []AlertManager `json:"activeAlertManagers"`
	Dropped []AlertManager `json:"droppedAlertManagers"`
}

type AlertState string

type AlertingRule struct {
	Name        string         `json:"name"`
	Query       string         `json:"query"`
	Duration    float64        `json:"duration"`
	Labels      model.LabelSet `json:"labels"`
	Annotations model.LabelSet `json:"annotations"`
	Alerts      []*Alert       `json:"alerts"`
	Health      RuleHealth     `json:"health"`
	LastError   string         `json:"lastError,omitempty"`
}

type AlertsResult struct {
	Alerts []Alert `json:"alerts"`
}

type ConfigResult struct {
	YAML string `json:"yaml"`
}

type DroppedTarget struct {
	DiscoveredLabels map[string]string `json:"discoveredLabels"`
}

type Error struct {
	Type   ErrorType
	Msg    string
	Detail string
}

type ErrorType string

type FlagsResult map[string]string

type HealthStatus string

type Range struct {
	// The boundaries of the time range.
	Start, End time.Time
	// The maximum time between two slices within the boundaries.
	Step time.Duration
}

type RecordingRule struct {
	Name      string         `json:"name"`
	Query     string         `json:"query"`
	Labels    model.LabelSet `json:"labels,omitempty"`
	Health    RuleHealth     `json:"health"`
	LastError string         `json:"lastError,omitempty"`
}

type RuleGroup struct {
	Name     string  `json:"name"`
	File     string  `json:"file"`
	Interval float64 `json:"interval"`
	Rules    Rules   `json:"rules"`
}

type RuleHealth string

type RuleType string

type Rules []interface{}

type RulesResult struct {
	Groups []RuleGroup `json:"groups"`
}

type SnapshotResult struct {
	Name string `json:"name"`
}

type TargetsResult struct {
	Active  []ActiveTarget  `json:"activeTargets"`
	Dropped []DroppedTarget `json:"droppedTargets"`
}