package main

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

var now = time.Date(2026, 10, 23, 20, 45, 12, 345_000_000, time.UTC)

func do(t *testing.T, args ...string) (code int, stdout, stderr string) {
	t.Helper()
	var out, errw bytes.Buffer
	code = run(args, &out, &errw, now)
	return code, out.String(), errw.String()
}

func TestCLI(t *testing.T) {
	root := t.TempDir()
	t.Chdir(root)

	if code, out, _ := do(t, "check"); code != 0 || out != "ok: 0 records checked\n" {
		t.Fatalf("empty check: %d %q", code, out)
	}
	code, out, _ := do(t, "new", "adr", "Use X")
	if code != 0 || out != "docs/adr/20261023T204512345Z-use-x.md\n" {
		t.Fatalf("new: %d %q", code, out)
	}
	code, out, _ = do(t, "check")
	var want strings.Builder
	for _, line := range []string{"6", "8", "20", "24", "28", "32"} { // numeric, not lexical, order
		want.WriteString("docs/adr/20261023T204512345Z-use-x.md:" + line + ": unfinished placeholder {{docs:todo}}\n")
	}
	if code != 1 || out != want.String() {
		t.Fatalf("check with markers: %d %q", code, out)
	}
	// --root checks another directory; the working directory is not used.
	t.Chdir(t.TempDir())
	if code, _, _ := do(t, "check", "--root", root); code != 1 {
		t.Errorf("--root: %d", code)
	}
	if code, out, _ := do(t, "check"); code != 0 || !strings.HasPrefix(out, "ok: ") {
		t.Errorf("cwd root: %d %q", code, out)
	}
}

func TestCLIExitCodes(t *testing.T) {
	t.Chdir(t.TempDir())
	must := func(err error) {
		t.Helper()
		if err != nil {
			t.Fatal(err)
		}
	}
	must(os.MkdirAll("docs/adr", 0o755))
	must(os.WriteFile(filepath.Join("docs", "adr", "bad.md"), nil, 0o644))
	for _, tt := range []struct {
		args []string
		code int
	}{
		{nil, 2},
		{[]string{"bogus"}, 2},
		{[]string{"new"}, 2},
		{[]string{"new", "adr"}, 2},
		{[]string{"new", "note", "T"}, 2},
		{[]string{"new", "adr", "T", "extra"}, 2},
		{[]string{"new", "adr", "!!!"}, 1},
		{[]string{"check", "--bogus"}, 2},
		{[]string{"check", "extra"}, 2},
		{[]string{"check", "--root", "missing-dir"}, 1},
		{[]string{"check"}, 1}, // bad.md is not a valid name
	} {
		if code, _, stderr := do(t, tt.args...); code != tt.code {
			t.Errorf("docs %v = %d, want %d (stderr %q)", tt.args, code, tt.code, stderr)
		}
	}
}