package release

import (
	"fmt"

	"github.com/charmbracelet/bubbles/list"
	"github.com/google/go-github/v55/github"
	"golang.org/x/mod/semver"
)

// ImageFormat describes the format of the installer container image for the given release.
var ImageFormat = `ghcr.io/siderolabs/installer:%s`

type ListItem struct {
	Release string
	Note    string
}

func (i *ListItem) Title() string {
	return i.Release
}

func (i *ListItem) Description() string {
	return i.Note
}

func (i *ListItem) FilterValue() string {
	return i.Release
}

func (i *ListItem) Image() string {
	return fmt.Sprintf(ImageFormat, i.Release)
}

func ToList(releases []*github.RepositoryRelease, lowestInstalled, highestInstalled string) list.Model {
	items := make([]list.Item, len(releases))

	nextRelease := FindNextRelease(releases, lowestInstalled, highestInstalled)

	for i, r := range releases {
		item := &ListItem{
			Release: r.GetName(),
		}

		if semver.Compare(lowestInstalled, r.GetName()) == 0 {
			item.Note = "lowest installed"
		}

		if semver.Compare(highestInstalled, r.GetName()) == 0 {
			item.Note = "highest installed"
		}

		if semver.Compare(nextRelease, r.GetName()) == 0 {
			item.Note = "recommended"
		}

		items[i] = item
	}

	return list.New(items, list.NewDefaultDelegate(), 0, 0)
}

func FindNextRelease(releases []*github.RepositoryRelease, lowestInstalled, highestInstalled string) string {
	nextRelease := highestInstalled

	// If we internally differ, we should upgrade everyone to the current highest installed release, first.
	if lowestInstalled != highestInstalled {
		return highestInstalled
	}

	for _, r := range releases {
		if semver.Compare(highestInstalled, r.GetName()) > 0 { // if this release is older than or the same age as the current
			// highest-installed release, ignore it
			continue
		}

		// if we haven't selected a next-highest release yet, set us as it
		if nextRelease == highestInstalled {
			nextRelease = r.GetName()

			continue
		}

		// If the "next" release is higher than this release, set this release to next, instead
		if semver.Compare(nextRelease, r.GetName()) < 0 {
			nextRelease = r.GetName()
		}
	}

	return nextRelease
}