package analyzer

// Severity is the heuristic finding severity.
type Severity string

const (
	SeverityInfo     Severity = "info"
	SeverityWarning  Severity = "warning"
	SeverityCritical Severity = "critical"
)

// Finding is a single triggered heuristic rule.
type Finding struct {
	Rule     string         `json:"rule"`
	Severity Severity       `json:"severity"`
	Stage    string         `json:"stage,omitempty"`
	Evidence map[string]any `json:"evidence"`
	Message  string         `json:"message"`
}

// Thresholds holds analyzer thresholds injected at runtime.
type Thresholds struct {
	DataSkewRatio       float64
	GCPressureRatio     float64
	BottleneckShuffleGB float64
}

// Input is the data passed to the heuristic rules.
type Input struct {
	StageMetrics    map[string]StageMetric    `json:"stage_metrics"`
	ExecutorMetrics map[string]ExecutorMetric `json:"executor_metrics"`
}

// StageMetric contains per-stage measurements.
type StageMetric struct {
	DurationMS        int64 `json:"duration_ms"`
	ShuffleReadBytes  int64 `json:"shuffle_read_bytes"`
	ShuffleWriteBytes int64 `json:"shuffle_write_bytes"`
	MaxPartitionBytes int64 `json:"max_partition_bytes"`
	MinPartitionBytes int64 `json:"min_partition_bytes"`
}

// ExecutorMetric contains per-executor measurements.
type ExecutorMetric struct {
	GCTimeMS  int64 `json:"gc_time_ms"`
	CPUTimeMS int64 `json:"cpu_time_ms"`
}