package gomod

import (
	"os"

	"git.yetaga.in/deltamualpha/libyear/pkg/libyear"
	"golang.org/x/mod/modfile"
)

func LoadAndComputePairs(filename string) ([]libyear.Pair, error) {
	b, err := os.ReadFile(filename)
	if err != nil {
		return nil, err
	}
	f, err := modfile.Parse(filename, b, nil)
	if err != nil {
		return nil, err
	}
	q := Queryer{}

	pairs := []libyear.Pair{}

	for v := range f.Require {
		if f.Require[v].Mod.Path != "" && f.Require[v].Mod.Version != "" {
			latest := q.GetLatestVersion(f.Require[v].Mod.Path)
			current := q.GetVersion(f.Require[v].Mod.Path, f.Require[v].Mod.Version)
			pairs = append(pairs, libyear.Pair{
				Name:    f.Require[v].Mod.Path,
				Current: current,
				Latest:  latest,
			})
		}
	}
	return pairs, nil
}