package reporting

// AggregateType defines how a metric should be aggregated.
type AggregateType string

const (
	AggregateCount   AggregateType = "count"
	AggregateAverage AggregateType = "average"
)

// MetricDefinition describes a single reporting metric.
// Reference: Chatwoot Reports::ReportMetricRegistry
type MetricDefinition struct {
	AggregateType    AggregateType
	RawEventName     string // maps to ReportingEvent.Name
	RollupMetric     RollupMetric
	SummaryKey       string // key used in summary output
}

// ReportMetricRegistry provides the catalog of all supported reporting metrics.
// Reference: Chatwoot ReportMetricRegistry — defines all metrics with their aggregate type,
// raw event name, rollup metric, and summary key.
var ReportMetricRegistry = map[string]MetricDefinition{
	"avg_first_response_time": {
		AggregateType:    AggregateAverage,
		RawEventName:     "first_response",
		RollupMetric:     MetricFirstResponse,
		SummaryKey:       "avg_first_response_time",
	},
	"avg_resolution_time": {
		AggregateType:    AggregateAverage,
		RawEventName:     "resolution_time",
		RollupMetric:     MetricResolutionTime,
		SummaryKey:       "avg_resolution_time",
	},
	"resolutions_count": {
		AggregateType:    AggregateCount,
		RawEventName:     "resolutions_count",
		RollupMetric:     MetricResolutionsCount,
		SummaryKey:       "resolutions_count",
	},
	"reply_time": {
		AggregateType:    AggregateAverage,
		RawEventName:     "reply_time",
		RollupMetric:     MetricReplyTime,
		SummaryKey:       "reply_time",
	},
	"first_response": {
		AggregateType:    AggregateAverage,
		RawEventName:     "first_response",
		RollupMetric:     MetricFirstResponse,
		SummaryKey:       "first_response",
	},
	"resolution_time": {
		AggregateType:    AggregateAverage,
		RawEventName:     "resolution_time",
		RollupMetric:     MetricResolutionTime,
		SummaryKey:       "resolution_time",
	},
	"bot_resolutions_count": {
		AggregateType:    AggregateCount,
		RawEventName:     "bot_resolutions_count",
		RollupMetric:     MetricBotResolutionsCount,
		SummaryKey:       "bot_resolutions_count",
	},
	"bot_handoffs_count": {
		AggregateType:    AggregateCount,
		RawEventName:     "bot_handoffs_count",
		RollupMetric:     MetricBotHandoffsCount,
		SummaryKey:       "bot_handoffs_count",
	},
}

// GetMetricDefinition returns the metric definition for a given metric key.
func GetMetricDefinition(key string) (MetricDefinition, bool) {
	def, ok := ReportMetricRegistry[key]
	return def, ok
}

// AllMetricKeys returns all registered metric keys.
func AllMetricKeys() []string {
	keys := make([]string, 0, len(ReportMetricRegistry))
	for k := range ReportMetricRegistry {
		keys = append(keys, k)
	}
	return keys
}