package modules

import (
	"net/http"

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

func init() {
	core.Register("commit", commitMod)
	core.Register("diff", diffMod)
}

// commit: metadata for the single commit at Ctx.Commit.
func commitMod(c *core.Ctx, args ...string) (any, error) {
	if c.Commit == "" {
		return nil, core.Errorf(http.StatusNotFound, "no commit")
	}
	log, err := c.Repo.Log(c.Commit, 1, 0, false)
	if err != nil {
		return nil, err
	}
	if len(log) == 0 {
		return nil, core.Errorf(http.StatusNotFound, "commit %s not found", c.Commit)
	}
	return log[0], nil
}

// diff: the patch for Ctx.Commit. This is the module that static
// generation made impractical -- here it is one git process, cached
// forever against an immutable SHA.
func diffMod(c *core.Ctx, args ...string) (any, error) {
	if c.Commit == "" {
		return gitx.Diff{}, nil
	}
	return c.Repo.DiffCommit(c.Commit)
}