package main

import (
	_ "embed"
	"fmt"
	"net/url"
	"os"
	"path"
	"strings"

	"sigs.k8s.io/yaml"
)

type Upstream struct {
	URLs []string `json:"urls"`
	Name string   `json:"name"`
	Desc string   `json:"desc"`
}

func ReadUpstreams(filename string) ([]Upstream, error) {
	bs, err := os.ReadFile(filename)
	if err != nil {
		return nil, fmt.Errorf("upstreams: %q: %w", filename, err)
	}
	var ret []Upstream
	if err := yaml.UnmarshalStrict(bs, &ret); err != nil {
		return nil, fmt.Errorf("upstreams: %q: %w", filename, err)
	}
	for i := range ret {
		upstream := ret[i]
		if err := upstream.Fill(); err != nil {
			return nil, fmt.Errorf("upstreams: %q: %w", filename, err)
		}
		ret[i] = upstream
	}
	return ret, nil
}

func (upstream *Upstream) Fill() error {
	if upstream.Name == "" {
		u, err := url.Parse(upstream.URLs[0])
		if err != nil {
			return err
		}
		_, upstream.Name = path.Split(strings.TrimSuffix(path.Clean(u.Path), ".git"))
	}
	return nil
}