package e2e

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

func TestCommitMessageIssueActions(t *testing.T) {
	inst := startInstance(t)
	aliceKey := inst.newKey(t, "alice")
	inst.admin(t, "admin", "user", "create", "alice",
		"--key", aliceKey+".pub", "--email", "alice@example.test", "--verified")

	if _, errOut, code := inst.ssh(t, aliceKey, "", "repo", "create", "alice/app"); code != 0 {
		t.Fatalf("repo create: %s", errOut)
	}
	work := t.TempDir()
	env := inst.gitEnv(aliceKey)
	mustGit(t, work, env, "clone", inst.sshURL("alice/app"), "w")
	dir := filepath.Join(work, "w")
	os.WriteFile(filepath.Join(dir, "a.txt"), []byte("a\n"), 0o644)
	mustGit(t, dir, env, "checkout", "-q", "-b", "main")
	mustGit(t, dir, env, "add", ".")
	mustGit(t, dir, env, "commit", "-q", "-m", "base")
	mustGit(t, dir, env, "push", "-q", "origin", "main")
	for _, title := range []string{"'one'", "'two'", "'three'"} {
		if _, _, code := inst.ssh(t, aliceKey, "", "issue", "create", "alice/app", "--title", title); code != 0 {
			t.Fatal("issue create failed")
		}
	}

	// A closing keyword on the default branch closes the issue with a
	// comment; a bare reference (and a nonexistent #99) only comments.
	os.WriteFile(filepath.Join(dir, "b.txt"), []byte("b\n"), 0o644)
	mustGit(t, dir, env, "add", ".")
	mustGit(t, dir, env, "commit", "-q", "-m", "repair the widget\n\nFixes #1. Related to #2 but not #99.")
	mustGit(t, dir, env, "push", "-q", "origin", "main")

	out, _, _ := inst.ssh(t, aliceKey, "", "issue", "show", "alice/app", "1", "--json")
	if !strings.Contains(out, `"state":"closed"`) || !strings.Contains(out, "closed by commit") {
		t.Fatalf("issue 1 not closed by commit: %s", out)
	}
	out, _, _ = inst.ssh(t, aliceKey, "", "issue", "show", "alice/app", "2", "--json")
	if !strings.Contains(out, `"state":"open"`) || !strings.Contains(out, "referenced in commit") ||
		!strings.Contains(out, "repair the widget") {
		t.Fatalf("issue 2 not referenced: %s", out)
	}

	// Commits on a feature branch do nothing until they land on the
	// default branch via a merge — then the merge path acts exactly once.
	mustGit(t, dir, env, "checkout", "-q", "-b", "feat")
	os.WriteFile(filepath.Join(dir, "c.txt"), []byte("c\n"), 0o644)
	mustGit(t, dir, env, "add", ".")
	mustGit(t, dir, env, "commit", "-q", "-m", "finish the gadget\n\nCloses #3")
	mustGit(t, dir, env, "push", "-q", "origin", "feat")
	out, _, _ = inst.ssh(t, aliceKey, "", "issue", "show", "alice/app", "3", "--json")
	if !strings.Contains(out, `"state":"open"`) {
		t.Fatalf("branch push acted early: %s", out)
	}
	if _, _, code := inst.ssh(t, aliceKey, "", "mr", "create", "alice/app",
		"--source", "feat", "--target", "main", "--title", "'gadget'"); code != 0 {
		t.Fatal("mr create failed")
	}
	if _, errOut, code := inst.ssh(t, aliceKey, "", "mr", "merge", "alice/app", "1"); code != 0 {
		t.Fatalf("merge: %s", errOut)
	}
	out, _, _ = inst.ssh(t, aliceKey, "", "issue", "show", "alice/app", "3", "--json")
	if !strings.Contains(out, `"state":"closed"`) || !strings.Contains(out, "closed by commit") {
		t.Fatalf("merge did not close issue 3: %s", out)
	}
	if strings.Count(out, "closed by commit") != 1 {
		t.Fatalf("duplicate close comments: %s", out)
	}

	// Pushing more commits does not re-act on already-processed shas.
	os.WriteFile(filepath.Join(dir, "d.txt"), []byte("d\n"), 0o644)
	mustGit(t, dir, env, "checkout", "-q", "main")
	mustGit(t, dir, env, "pull", "-q", "origin", "main")
	mustGit(t, dir, env, "add", ".")
	mustGit(t, dir, env, "commit", "-q", "-m", "unrelated")
	mustGit(t, dir, env, "push", "-q", "origin", "main")
	out, _, _ = inst.ssh(t, aliceKey, "", "issue", "show", "alice/app", "2", "--json")
	if strings.Count(out, "referenced in commit") != 1 {
		t.Fatalf("reference duplicated: %s", out)
	}
}