//go:build !bindings

package main

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

	"encoding/json/v2"
)

func TestResolveConfigPathDefaultIsHome(t *testing.T) {
	got, err := resolveConfigPath(nil)
	if err != nil {
		t.Fatal(err)
	}
	home, err := os.UserHomeDir()
	if err != nil {
		t.Fatal(err)
	}
	want := filepath.Join(home, ".funknetz.json")
	if got != want {
		t.Fatalf("resolveConfigPath(nil) = %q, want %q", got, want)
	}
}

func TestResolveConfigPathLongAndShort(t *testing.T) {
	dir := t.TempDir()
	abs := filepath.Join(dir, "lab.json")

	got, err := resolveConfigPath([]string{"--config", abs})
	if err != nil {
		t.Fatal(err)
	}
	if got != abs {
		t.Fatalf("--config = %q, want %q", got, abs)
	}

	got, err = resolveConfigPath([]string{"-c", abs})
	if err != nil {
		t.Fatal(err)
	}
	if got != abs {
		t.Fatalf("-c = %q, want %q", got, abs)
	}
}

func TestResolveConfigPathRelativeBecomesAbsolute(t *testing.T) {
	dir := t.TempDir()
	cwd, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = os.Chdir(cwd) })
	if err := os.Chdir(dir); err != nil {
		t.Fatal(err)
	}

	got, err := resolveConfigPath([]string{"-c", "./funknetz.json"})
	if err != nil {
		t.Fatal(err)
	}
	want, err := filepath.EvalSymlinks(filepath.Join(dir, "funknetz.json"))
	if err != nil {
		// File need not exist; resolve the directory and join.
		base, err := filepath.EvalSymlinks(dir)
		if err != nil {
			t.Fatal(err)
		}
		want = filepath.Join(base, "funknetz.json")
	}
	gotEval, err := filepath.EvalSymlinks(filepath.Dir(got))
	if err != nil {
		t.Fatal(err)
	}
	got = filepath.Join(gotEval, filepath.Base(got))
	if got != want {
		t.Fatalf("relative -c = %q, want %q", got, want)
	}
}

func TestOpenStationUsesResolvedPath(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "custom.json")

	_, err := openStation([]string{"-c", path})
	if err == nil {
		t.Fatal("openStation() error = nil, want rejection after creating the file")
	}
	if !strings.Contains(err.Error(), "created") {
		t.Fatalf("openStation() error = %q, want it to say the file was created", err.Error())
	}

	info, err := os.Stat(path)
	if err != nil {
		t.Fatal(err)
	}
	if got, want := info.Mode().Perm(), os.FileMode(0o600); got != want {
		t.Fatalf("mode = %o, want %o", got, want)
	}

	// Same rules as the home file: a second open with a filled config works.
	body := `{
  "host": "127.0.0.1",
  "port": 5300,
  "callsign": "DL0FN-1",
  "authKey": "local-lab-secret-change-me",
  "talkGroup": 9,
  "enableLogging": false,
  "logFile": "` + filepath.Join(dir, "funknetz.log") + `"
}
`
	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
		t.Fatal(err)
	}
	st, err := openStation([]string{"--config", path})
	if err != nil {
		t.Fatal(err)
	}
	if st.State().Callsign != "DL0FN-1" {
		t.Fatalf("callsign = %q, want DL0FN-1", st.State().Callsign)
	}
}

func TestConfigEqualsFlagSelectsTheFile(t *testing.T) {
	abs := filepath.Join(t.TempDir(), "lab.json")
	got, err := resolveConfigPath([]string{"--config=" + abs})
	if err != nil {
		t.Fatal(err)
	}
	if got != abs {
		t.Fatalf("--config= = %q, want %q", got, abs)
	}
}

func TestCreatedFileViaFlagMatchesHomeTemplate(t *testing.T) {
	path := filepath.Join(t.TempDir(), "lab.json")
	var stderr bytes.Buffer
	st, err := openStationReported([]string{"-c", path}, &stderr)
	if st != nil {
		t.Fatal("station = non-nil, want nil before the window")
	}
	if err == nil {
		t.Fatal("error = nil, want the file created")
	}
	if got, want := err.Error(), "created "+path; got != want {
		t.Fatalf("error = %q, want %q", got, want)
	}
	if got, want := stderr.String(), err.Error()+"\n"; got != want {
		t.Fatalf("stderr = %q, want %q", got, want)
	}
	info, err := os.Stat(path)
	if err != nil {
		t.Fatal(err)
	}
	if got, want := info.Mode().Perm(), os.FileMode(0o600); got != want {
		t.Fatalf("mode = %o, want %o", got, want)
	}
	body, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	var got map[string]any
	if err := json.Unmarshal(body, &got); err != nil {
		t.Fatalf("created file is not JSON: %v\n%s", err, body)
	}
	if got["host"] != "" || got["callsign"] != "" || got["authKey"] != "" {
		t.Fatalf("string fields = %#v, want empty host, callsign, and authKey", got)
	}
	if got["port"] != float64(0) || got["talkGroup"] != float64(0) {
		t.Fatalf("numeric fields = %#v, want port and talkGroup at zero", got)
	}
	if got["enableLogging"] != false {
		t.Fatalf("enableLogging = %#v, want false", got["enableLogging"])
	}
	home, err := os.UserHomeDir()
	if err != nil {
		t.Fatal(err)
	}
	if got["logFile"] != filepath.Join(home, "funknetz.log") {
		t.Fatalf("logFile = %#v, want funknetz.log in the home directory", got["logFile"])
	}
}

func TestLaterFlagSelectsTheFile(t *testing.T) {
	dir := t.TempDir()
	first := filepath.Join(dir, "first.json")
	second := filepath.Join(dir, "second.json")

	got, err := resolveConfigPath([]string{"-c", first, "--config", second})
	if err != nil {
		t.Fatal(err)
	}
	if got != second {
		t.Fatalf("later --config = %q, want %q", got, second)
	}

	got, err = resolveConfigPath([]string{"--config", first, "-c", second})
	if err != nil {
		t.Fatal(err)
	}
	if got != second {
		t.Fatalf("later -c = %q, want %q", got, second)
	}
}

func TestEmptyConfigFlagUsesHomeFile(t *testing.T) {
	home, err := os.UserHomeDir()
	if err != nil {
		t.Fatal(err)
	}
	want := filepath.Join(home, ".funknetz.json")
	for _, args := range [][]string{
		{"-c", ""},
		{"--config", ""},
		{"--config="},
	} {
		got, err := resolveConfigPath(args)
		if err != nil {
			t.Fatal(err)
		}
		if got != want {
			t.Fatalf("resolveConfigPath(%q) = %q, want %q", args, got, want)
		}
	}
}

func TestExtraWordsDoNotChangeTheSelectedFile(t *testing.T) {
	abs := filepath.Join(t.TempDir(), "lab.json")
	got, err := resolveConfigPath([]string{"-c", abs, "leftover"})
	if err != nil {
		t.Fatal(err)
	}
	if got != abs {
		t.Fatalf("with leftover = %q, want %q", got, abs)
	}

	home, err := os.UserHomeDir()
	if err != nil {
		t.Fatal(err)
	}
	got, err = resolveConfigPath([]string{"note"})
	if err != nil {
		t.Fatal(err)
	}
	want := filepath.Join(home, ".funknetz.json")
	if got != want {
		t.Fatalf("bare word = %q, want %q", got, want)
	}

	got, err = resolveConfigPath([]string{"note", "-c", abs})
	if err != nil {
		t.Fatal(err)
	}
	if got != abs {
		t.Fatalf("word before -c = %q, want %q", got, abs)
	}

	second := filepath.Join(filepath.Dir(abs), "second.json")
	got, err = resolveConfigPath([]string{"-c", abs, "leftover", "--config", second})
	if err != nil {
		t.Fatal(err)
	}
	if got != second {
		t.Fatalf("flag after a word = %q, want %q", got, second)
	}
}

func TestSelectedFileIsLeftByteForByte(t *testing.T) {
	path := filepath.Join(t.TempDir(), "lab.json")
	original := []byte("{\"host\":\"127.0.0.1\",\"port\":5308,\"callsign\":\"DL1ABC\",\"authKey\":\"a b\",\"talkGroup\":20,\"enableLogging\":false,\"logFile\":\"/tmp/funknetz.log\"}\n")
	if err := os.WriteFile(path, original, 0o640); err != nil {
		t.Fatal(err)
	}

	st, err := openStation([]string{"--config", path})
	if err != nil {
		t.Fatal(err)
	}
	if st.State().Callsign != "DL1ABC" {
		t.Fatalf("callsign = %q, want DL1ABC", st.State().Callsign)
	}
	got, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if string(got) != string(original) {
		t.Fatalf("file = %q, want %q", got, original)
	}
}

func TestEmptyHostOnSelectedFileNamesHost(t *testing.T) {
	path := filepath.Join(t.TempDir(), "lab.json")
	body := []byte("{\"host\":\"\",\"port\":5308,\"callsign\":\"DL1ABC\",\"authKey\":\"key\",\"talkGroup\":20,\"enableLogging\":false,\"logFile\":\"/tmp/funknetz.log\"}\n")
	if err := os.WriteFile(path, body, 0o600); err != nil {
		t.Fatal(err)
	}
	var stderr bytes.Buffer
	st, err := openStationReported([]string{"-c", path}, &stderr)
	if st != nil {
		t.Fatal("station = non-nil, want nil")
	}
	if err == nil || !strings.Contains(err.Error(), "host") {
		t.Fatalf("error = %v, want it to name host", err)
	}
	if stderr.String() != err.Error()+"\n" {
		t.Fatalf("stderr = %q, want the error line", stderr.String())
	}
}

func TestBadFlagPrintsParserError(t *testing.T) {
	cases := []struct {
		args []string
		want string
	}{
		{[]string{"-not-a-flag"}, "flag provided but not defined: -not-a-flag\n"},
		{[]string{"-c"}, "flag needs an argument: -c\n"},
		{[]string{"--config"}, "flag needs an argument: -config\n"},
	}
	for _, tc := range cases {
		var stderr bytes.Buffer
		st, err := openStationReported(tc.args, &stderr)
		if st != nil {
			t.Fatal("station = non-nil, want nil")
		}
		if err == nil {
			t.Fatal("error = nil, want a flag error")
		}
		if got := stderr.String(); got != tc.want {
			t.Fatalf("stderr = %q, want %q", got, tc.want)
		}
		if strings.Contains(strings.ToLower(stderr.String()), "usage") {
			t.Fatalf("stderr = %q, want no usage text", stderr.String())
		}
	}
}