package briefing

type factRequirementCategory string

const (
	collectedFactRequirement factRequirementCategory = "collected"
	derivedFactRequirement   factRequirementCategory = "derived"
)

type factRequirement struct {
	identity  string
	category  factRequirementCategory
	available func(ModuleContext) bool
}

func (r factRequirement) String() string {
	return r.identity
}

var (
	currentConditionsRequirement = &factRequirement{identity: "collected.current_conditions", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Collected.Current != nil
	}}
	narrativeForecastRequirement = &factRequirement{identity: "collected.narrative_forecast", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Collected.Narrative != nil
	}}
	hourlyForecastRequirement = &factRequirement{identity: "collected.hourly_forecast", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Collected.Hourly != nil
	}}
	alertsRequirement = &factRequirement{identity: "collected.alerts", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Collected.Alerts != nil
	}}
	discussionRequirement = &factRequirement{identity: "collected.discussion", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Collected.Discussion != nil
	}}
	weatherStoryRequirement = &factRequirement{identity: "collected.weather_story", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Collected.WeatherStory != nil
	}}
	spcOutlooksRequirement = &factRequirement{identity: "collected.spc_convective_outlooks", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Collected.SPCConvectiveOutlooks != nil
	}}
	sourceMetadataRequirement = &factRequirement{identity: "collected.source_metadata", category: collectedFactRequirement, available: func(ctx ModuleContext) bool {
		return len(ctx.Collected.SourceProvenance) > 0 || len(ctx.Collected.SourceWarnings) > 0
	}}

	hourlyPeriodsRequirement = &factRequirement{identity: "derived.hourly_periods", category: derivedFactRequirement, available: func(ctx ModuleContext) bool {
		return len(ctx.Derived.ValidPeriodHourlyPeriods) > 0
	}}
	narrativePeriodsRequirement = &factRequirement{identity: "derived.narrative_periods", category: derivedFactRequirement, available: func(ctx ModuleContext) bool {
		return len(ctx.Derived.ValidPeriodNarrativePeriods) > 0
	}}
	alertOverlapsRequirement = &factRequirement{identity: "derived.alert_overlaps", category: derivedFactRequirement, available: func(ModuleContext) bool {
		return true
	}}
	dailySummariesRequirement = &factRequirement{identity: "derived.daily_summaries", category: derivedFactRequirement, available: func(ctx ModuleContext) bool {
		return len(ctx.Derived.DailySummaries) > 0
	}}
	daypartSummariesRequirement = &factRequirement{identity: "derived.daypart_summaries", category: derivedFactRequirement, available: func(ctx ModuleContext) bool {
		return len(ctx.Derived.DaypartSummaries) > 0
	}}
	precipTimingRequirement = &factRequirement{identity: "derived.precip_timing", category: derivedFactRequirement, available: func(ModuleContext) bool {
		return true
	}}
	spcDerivedOutlooksRequirement = &factRequirement{identity: "derived.spc_convective_outlooks", category: derivedFactRequirement, available: func(ctx ModuleContext) bool {
		return ctx.Derived.SPCConvectiveOutlooks != nil
	}}
)

var factRequirementVocabulary = []*factRequirement{
	currentConditionsRequirement,
	narrativeForecastRequirement,
	hourlyForecastRequirement,
	alertsRequirement,
	discussionRequirement,
	weatherStoryRequirement,
	spcOutlooksRequirement,
	sourceMetadataRequirement,
	hourlyPeriodsRequirement,
	narrativePeriodsRequirement,
	alertOverlapsRequirement,
	dailySummariesRequirement,
	daypartSummariesRequirement,
	precipTimingRequirement,
	spcDerivedOutlooksRequirement,
}