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package caldata
import (
"time"
"github.com/lukaszkasprzak/lectio/internal/calendar"
)
// Readings resolves a day's Mass readings: the observed celebration's inline
// propers, else the temporal lectionary for its slug, else -- for an EF
// weekday with no proper Mass -- the preceding Sunday's Mass (the 1962 rule
// that green-season ferias repeat the Sunday). Shared by the CLI (cli.dayReadings
// delegates here) and calfeed.Build (injected as its readings func).
func Readings(sel calendar.Selection, layers []calendar.Layer, date time.Time, day calendar.LiturgicalDay) []calendar.Reading {
var rs []calendar.Reading
for _, m := range day.Observed.Masses {
rs = append(rs, m.Readings...)
}
if len(rs) > 0 {
return rs
}
// temporal table: EF by bare slug; OF by slug+cycle. Sundays & solemnities
// use the 3-year Sunday cycle (A/B/C); ferial weekdays use the 2-year
// weekday cycle (I/II). Sunday-slugs and weekday-slugs are disjoint, so
// trying both cycle suffixes is unambiguous.
if sel.Form == "old" {
if r := TemporalReadings("old", day.Observed.Slug); len(r) > 0 {
return r
}
} else {
for _, cyc := range []string{day.SundayCycle, day.WeekdayCycle} {
if cyc == "" {
continue
}
if r := TemporalReadings("new", day.Observed.Slug+"-"+cyc); len(r) > 0 {
return r
}
}
}
// OF: a sanctoral memorial / optional memorial with no proper readings of its
// own reads the FERIAL (weekday) readings of the day -- the ordinary OF rule.
// Compute the pure temporal (no sanctoral) to get the day's ferial slug.
if sel.Form != "old" && day.Observed.Layer != "temporal" &&
day.WeekdayCycle != "" && date.Weekday() != time.Sunday {
temp := calendar.Compute(date, sel, nil)
if temp.Observed.Layer == "temporal" {
if r := TemporalReadings("new", temp.Observed.Slug+"-"+day.WeekdayCycle); len(r) > 0 {
return r
}
}
}
// EF: a green-season weekday with no proper Mass repeats the preceding Sunday.
if sel.Form == "old" && day.Observed.Layer == "temporal" && date.Weekday() != time.Sunday {
sun := date.AddDate(0, 0, -int(date.Weekday())) // preceding Sunday (Sunday = 0)
sd := calendar.Compute(sun, sel, layers)
return TemporalReadings(sel.Form, sd.Observed.Slug)
}
return nil
}
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