package core
import (
"sync"
"github.com/xuri/excelize/v2"
"github.com/xiidea/easy-excel/extension/compat"
)
// styleInterner memoizes excelize style IDs per canonical style spec
// (PLAN.md §6): repeated applyFromArray-style calls hit a map instead of
// growing the stylesheet. Reset on degrade because style IDs belong to the
// underlying excelize.File instance.
type styleInterner struct {
mu sync.Mutex
bySpec map[string]int
}
// specID returns the excelize style ID for a spec, creating and caching it on
// first use. The cache key is the spec's canonical JSON form.
func (si *styleInterner) specID(f *excelize.File, spec compat.StyleSpec) (int, error) {
key := spec.CanonicalKey()
si.mu.Lock()
defer si.mu.Unlock()
if id, ok := si.bySpec[key]; ok {
return id, nil
}
style, err := compat.TranslateStyle(spec)
if err != nil {
return 0, err
}
id, err := f.NewStyle(style)
if err != nil {
return 0, err
}
if si.bySpec == nil {
si.bySpec = make(map[string]int)
}
si.bySpec[key] = id
return id, nil
}
func (si *styleInterner) numFmtID(f *excelize.File, code string) (int, error) {
return si.specID(f, compat.StyleSpec{
"numberFormat": map[string]any{"formatCode": code},
})
}
func (si *styleInterner) reset() {
si.mu.Lock()
si.bySpec = nil
si.mu.Unlock()
}
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