package main

import (
	"context"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
)

func TestGitAnalyzer(t *testing.T) {
	if _, e := exec.LookPath("git"); e != nil {
		t.Skip("git unavailable")
	}
	d := t.TempDir()
	run := func(args ...string) {
		c := exec.Command("git", append([]string{"-C", d}, args...)...)
		c.Env = append(os.Environ(), "GIT_AUTHOR_NAME=Test User", "GIT_AUTHOR_EMAIL=test@example.com", "GIT_COMMITTER_NAME=Test User", "GIT_COMMITTER_EMAIL=test@example.com")
		if b, e := c.CombinedOutput(); e != nil {
			t.Fatalf("git %v: %v %s", args, e, b)
		}
	}
	run("init")
	if e := os.WriteFile(filepath.Join(d, "main.go"), []byte("package main\n"), 0644); e != nil {
		t.Fatal(e)
	}
	run("add", ".")
	run("commit", "-m", "initial")
	g, e := (GitAnalyzer{}).Analyze(context.Background(), d)
	if e != nil {
		t.Fatal(e)
	}
	if g.CommitCount != 1 || g.Added != 1 || g.ContributorCount != 1 {
		t.Fatalf("unexpected git stats: %#v", g)
	}
}

func TestGitRefDetailsAndSafeCheckout(t *testing.T) {
	if _, e := exec.LookPath("git"); e != nil {
		t.Skip("git unavailable")
	}
	d := t.TempDir()
	run := func(args ...string) {
		c := exec.Command("git", append([]string{"-C", d}, args...)...)
		c.Env = append(os.Environ(), "GIT_AUTHOR_NAME=Test User", "GIT_AUTHOR_EMAIL=test@example.com", "GIT_COMMITTER_NAME=Test User", "GIT_COMMITTER_EMAIL=test@example.com")
		if b, e := c.CombinedOutput(); e != nil {
			t.Fatalf("git %v: %v %s", args, e, b)
		}
	}
	run("init")
	if e := os.WriteFile(filepath.Join(d, "main.go"), []byte("package main\n"), 0644); e != nil {
		t.Fatal(e)
	}
	run("add", ".")
	run("commit", "-m", "initial")
	run("switch", "-c", "feature")
	if e := os.WriteFile(filepath.Join(d, "main.go"), []byte("package main\n// feature\n"), 0644); e != nil {
		t.Fatal(e)
	}
	run("add", ".")
	run("commit", "-m", "feature")
	g := GitAnalyzer{}
	stats, e := g.AnalyzeRef(context.Background(), d, "feature")
	if e != nil {
		t.Fatal(e)
	}
	if stats.ViewRef != "feature" || stats.CommitCount != 2 {
		t.Fatalf("unexpected ref stats: %#v", stats)
	}
	detail, e := g.CommitDetail(context.Background(), d, stats.Commits[0].Hash)
	if e != nil {
		t.Fatal(e)
	}
	if len(detail.Files) == 0 {
		t.Fatal("commit files missing")
	}
	if e = os.WriteFile(filepath.Join(d, "dirty.txt"), []byte("dirty"), 0644); e != nil {
		t.Fatal(e)
	}
	if _, e = g.CheckoutBranch(context.Background(), d, "master"); e == nil || !strings.Contains(e.Error(), "GIT_WORKTREE_DIRTY") {
		t.Fatalf("dirty checkout error=%v", e)
	}
}