package modules

import (
	"sort"
	"strconv"

	"gsg/internal/core"
)

// This file is the ENTIRE cost of adding a feature. No core change, no
// route change, no registration list to update -- write the module, then
// call `mod "authors"` from any template that wants it.

type Author struct {
	Name    string
	Commits int
}

func init() { core.Register("authors", authorsMod) }

// authors: commit counts per author over the last N commits (default 500).
func authorsMod(c *core.Ctx, args ...string) (any, error) {
	n := 500
	if len(args) > 0 {
		if v, err := strconv.Atoi(args[0]); err == nil {
			n = v
		}
	}
	rev := c.Commit
	if rev == "" {
		rev = c.Ref
	}
	log, err := c.Repo.Log(rev, n)
	if err != nil {
		return nil, err
	}
	counts := map[string]int{}
	for _, cm := range log {
		counts[cm.Author]++
	}
	out := make([]Author, 0, len(counts))
	for name, n := range counts {
		out = append(out, Author{Name: name, Commits: n})
	}
	sort.Slice(out, func(i, j int) bool {
		if out[i].Commits != out[j].Commits {
			return out[i].Commits > out[j].Commits
		}
		return out[i].Name < out[j].Name
	})
	return out, nil
}