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package calendar
// mergeLayers folds an ordered layer stack into one raw celebration set. Later
// layers override earlier ones field-by-field; a slug with Fields["suppress"]
// == "true" is removed; variant sub-sections merge per variant.
func mergeLayers(layers []Layer) map[string]RawCelebration {
out := map[string]RawCelebration{}
for _, layer := range layers {
for slug, rc := range layer.Cels {
if rc.Fields["suppress"] == "true" {
delete(out, slug)
continue
}
cur, ok := out[slug]
if !ok {
cur = RawCelebration{Fields: map[string]string{}, Variants: map[string]map[string]string{}}
} else {
cur = cloneRaw(cur)
}
for k, v := range rc.Fields {
cur.Fields[k] = v
}
for variant, fields := range rc.Variants {
if cur.Variants[variant] == nil {
cur.Variants[variant] = map[string]string{}
}
for k, v := range fields {
cur.Variants[variant][k] = v
}
}
cur.Fields["layer"] = layer.ID // provenance: last writer
out[slug] = cur
}
}
return out
}
func cloneRaw(rc RawCelebration) RawCelebration {
nf := make(map[string]string, len(rc.Fields))
for k, v := range rc.Fields {
nf[k] = v
}
nv := make(map[string]map[string]string, len(rc.Variants))
for variant, fields := range rc.Variants {
m := make(map[string]string, len(fields))
for k, v := range fields {
m[k] = v
}
nv[variant] = m
}
return RawCelebration{Fields: nf, Variants: nv}
}
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