package modules

import (
	"net/http"
	"strings"

	"gsg/internal/core"
	"gsg/internal/gitx"
)

type Tree struct {
	Path    string
	Crumbs  []Crumb
	Entries []gitx.Entry
}

type Crumb struct{ Name, Path string }

func init() { core.Register("tree", treeMod) }

// tree: one directory level at Ctx.Path, with breadcrumbs.
// Optional arg overrides the path:  {{ mod "tree" "docs" }}
func treeMod(c *core.Ctx, args ...string) (any, error) {
	path := c.Path
	if len(args) > 0 {
		path = args[0]
	}
	// Resolve against the SHA, not the ref name: the ref could move between
	// the resolve in buildCtx and here, which would make the ETag a lie.
	rev := c.Commit
	if rev == "" {
		rev = c.Ref
	}
	entries, err := c.Repo.Tree(rev, path)
	if err != nil {
		// A valid commit with a bad path is a 404, not a server error.
		return nil, core.Errorf(http.StatusNotFound, "no such path %q", path)
	}
	t := Tree{Path: path, Entries: entries}
	if path != "" {
		var acc []string
		for _, seg := range strings.Split(path, "/") {
			acc = append(acc, seg)
			t.Crumbs = append(t.Crumbs, Crumb{Name: seg, Path: strings.Join(acc, "/")})
		}
	}
	return t, nil
}