package plugin

import "maps"

// CSSManifest declares a plugin's CSS dependencies and customizations.
type CSSManifest struct {
	NPMPackages    map[string]string `json:"npm_packages,omitempty"`
	CSSDirectives  []string          `json:"css_directives,omitempty"`
	InputCSSAppend string            `json:"input_css_append,omitempty"`
}

// MergedCSSManifest aggregates CSS manifests from all plugins.
type MergedCSSManifest struct {
	NPMPackages    map[string]string `json:"npm_packages"`
	CSSDirectives  []string          `json:"css_directives"`
	InputCSSAppend string            `json:"input_css_append"`
	Sources        []string          `json:"sources"`
}

// MergeCSSManifests combines multiple plugin CSS manifests into one.
func MergeCSSManifests(manifests map[string]*CSSManifest) *MergedCSSManifest {
	merged := &MergedCSSManifest{
		NPMPackages: make(map[string]string),
	}

	for name, m := range manifests {
		if m == nil {
			continue
		}
		merged.Sources = append(merged.Sources, name)
		maps.Copy(merged.NPMPackages, m.NPMPackages)
		merged.CSSDirectives = append(merged.CSSDirectives, m.CSSDirectives...)

		if m.InputCSSAppend != "" {
			if merged.InputCSSAppend != "" {
				merged.InputCSSAppend += "\n"
			}
			merged.InputCSSAppend += "/* === Plugin: " + name + " === */\n"
			merged.InputCSSAppend += m.InputCSSAppend
		}
	}

	return merged
}