package bulk

import (
	"sort"

	"tangled.org/odd.computer/isomorph/internal/distro"
	"tangled.org/odd.computer/isomorph/internal/distro/alpine"
	"tangled.org/odd.computer/isomorph/internal/model"
)

// FromAlpine builds one row per origin (source package) of the edge APKINDEX of each section.
// The APKINDEX supplies the built version, url and binary names; the origin's APKBUILD (keyed
// "<section>/<origin>") supplies the source URLs. OSV defines Alpine ecosystems per release
// (Alpine:v3.22), not for edge, so OSVEcosystem stays empty for these rows.
func FromAlpine(index map[string][]alpine.IndexEntry, apkbuilds map[string]*alpine.APKBUILD) []Package {
	var out []Package
	for _, section := range sortedKeys(index) {
		type origin struct {
			version, url string
			bins         []string
		}
		origins := map[string]*origin{}
		for _, e := range index[section] {
			name := e.Origin
			if name == "" {
				name = e.Name
			}
			o := origins[name]
			if o == nil {
				o = &origin{version: e.Version, url: e.URL}
				origins[name] = o
			}
			o.bins = append(o.bins, e.Name)
		}
		for _, name := range sortedKeys(origins) {
			o := origins[name]
			p := Package{Distro: model.Alpine, Suite: "edge-" + section, Name: name, Version: o.version,
				Binaries: dedupe(o.bins), Homepage: o.url, Status: StatusUnresolved}
			if ab := apkbuilds[section+"/"+name]; ab != nil {
				if ab.URL != "" {
					p.Homepage = ab.URL
				}
				fill(&p, distro.RankCandidates(alpine.Candidates(ab)))
			} else if o.url != "" {
				fill(&p, distro.RankCandidates(distro.AddCandidate(nil, o.url, model.Evidence{Source: "APKINDEX:url", Value: o.url, Weight: 0.5})))
			}
			out = append(out, p)
		}
	}
	return out
}

func sortedKeys[V any](m map[string]V) []string {
	out := make([]string, 0, len(m))
	for k := range m {
		out = append(out, k)
	}
	sort.Strings(out)
	return out
}