package config

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

const valid = `{
  "radarr":  {"url": "http://localhost:7878/", "apikey": "r"},
  "sonarr":  {"url": "http://localhost:8989",  "apikey": "s"},
  "sabnzbd": {"url": "https://sab.example.com", "apikey": "n"}
}`

func TestParseValid(t *testing.T) {
	cfg, err := Parse([]byte(valid))
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Radarr.URL != "http://localhost:7878" {
		t.Errorf("trailing slash not trimmed: %q", cfg.Radarr.URL)
	}
	if cfg.UI.RefreshSeconds != defaultRefreshSeconds {
		t.Errorf("refresh default = %d", cfg.UI.RefreshSeconds)
	}
}

func TestParseErrors(t *testing.T) {
	tests := map[string]struct {
		json string
		want string
	}{
		"unknown field": {`{"radar": {}}`, "unknown field"},
		"missing key":   {`{"radarr":{"url":"http://a"},"sonarr":{"url":"http://b","apikey":"x"},"sabnzbd":{"url":"http://c","apikey":"x"}}`, "radarr: apikey is required"},
		"bad url":       {`{"radarr":{"url":"localhost","apikey":"x"},"sonarr":{"url":"http://b","apikey":"x"},"sabnzbd":{"url":"http://c","apikey":"x"}}`, "must be an http(s) URL"},
		"invalid json":  {`{`, "parsing config"},
	}
	for name, tc := range tests {
		t.Run(name, func(t *testing.T) {
			_, err := Parse([]byte(tc.json))
			if err == nil || !strings.Contains(err.Error(), tc.want) {
				t.Fatalf("err = %v, want containing %q", err, tc.want)
			}
		})
	}
}

func TestEnvOverride(t *testing.T) {
	t.Setenv("ARR_TUI_RADARR_APIKEY", "from-env")
	cfg, err := Parse([]byte(valid))
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Radarr.APIKey != "from-env" {
		t.Errorf("apikey = %q", cfg.Radarr.APIKey)
	}
}

func TestLoadPermissionWarning(t *testing.T) {
	path := filepath.Join(t.TempDir(), "config.json")
	if err := os.WriteFile(path, []byte(valid), 0o644); err != nil {
		t.Fatal(err)
	}
	_, warnings, err := Load(path)
	if err != nil {
		t.Fatal(err)
	}
	if len(warnings) != 1 {
		t.Fatalf("warnings = %v", warnings)
	}
	if err := os.Chmod(path, 0o600); err != nil {
		t.Fatal(err)
	}
	if _, warnings, _ = Load(path); len(warnings) != 0 {
		t.Fatalf("unexpected warnings: %v", warnings)
	}
}

func TestShowCovers(t *testing.T) {
	base := `{"radarr":{"url":"http://r","apikey":"k"},"sonarr":{"url":"http://s","apikey":"k"},"sabnzbd":{"url":"http://a","apikey":"k"}`
	for _, tc := range []struct {
		ui   string
		want bool
	}{
		{``, true},
		{`,"ui":{}`, true},
		{`,"ui":{"covers":true}`, true},
		{`,"ui":{"covers":false}`, false},
	} {
		cfg, err := Parse([]byte(base + tc.ui + `}`))
		if err != nil {
			t.Fatal(err)
		}
		if got := cfg.UI.ShowCovers(); got != tc.want {
			t.Errorf("%q: ShowCovers = %v, want %v", tc.ui, got, tc.want)
		}
	}
}

func TestCoverStyleValidation(t *testing.T) {
	base := `{"radarr":{"url":"http://r","apikey":"k"},"sonarr":{"url":"http://s","apikey":"k"},"sabnzbd":{"url":"http://a","apikey":"k"},"ui":{"cover_style":`
	for _, ok := range []string{`"auto"`, `"quadrant"`, `"sextant"`, `"cells"`, `"kitty"`, `""`} {
		if _, err := Parse([]byte(base + ok + `}}`)); err != nil {
			t.Errorf("%s rejected: %v", ok, err)
		}
	}
	if _, err := Parse([]byte(base + `"sixel"}}`)); err == nil {
		t.Error("unknown style accepted")
	}
}

func TestThemeValidation(t *testing.T) {
	base := `{"radarr":{"url":"http://r","apikey":"k"},"sonarr":{"url":"http://s","apikey":"k"},"sabnzbd":{"url":"http://a","apikey":"k"},"ui":{"theme":`
	for _, ok := range []string{`"auto"`, `"dark"`, `"light"`, `""`} {
		if _, err := Parse([]byte(base + ok + `}}`)); err != nil {
			t.Errorf("%s rejected: %v", ok, err)
		}
	}
	if _, err := Parse([]byte(base + `"solarized"}}`)); err == nil {
		t.Error("unknown theme accepted")
	}
}

func TestSaveRoundTripAndPermissions(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.json")
	covers := false
	cfg := &Config{
		Radarr:  Arr{Service: Service{URL: "http://r:7878", APIKey: "rk"}, DefaultQualityProfile: "HD-1080p"},
		Sonarr:  Arr{Service: Service{URL: "http://s:8989", APIKey: "sk"}},
		SABnzbd: Service{URL: "http://a:8080", APIKey: "ak"},
		UI:      UI{RefreshSeconds: 5, Covers: &covers, CoverStyle: "sextant", Bell: true},
	}
	if err := Save(path, cfg); err != nil {
		t.Fatal(err)
	}
	info, err := os.Stat(path)
	if err != nil || info.Mode().Perm() != 0o600 {
		t.Fatalf("new file mode = %v, want 0600 (it holds API keys): %v", info.Mode().Perm(), err)
	}
	got, err := LoadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if got.Radarr.DefaultQualityProfile != "HD-1080p" || got.UI.RefreshSeconds != 5 || got.UI.Covers == nil || *got.UI.Covers || got.UI.CoverStyle != "sextant" || !got.UI.Bell {
		t.Errorf("round trip lost values: %+v", got)
	}
	// Unset optional settings stay out of the file.
	if data, _ := os.ReadFile(path); strings.Contains(string(data), "notify_downloads") || strings.Contains(string(data), "default_root_folder") {
		t.Errorf("unset settings written:\n%s", data)
	}

	// An existing file keeps its permissions and no temporary file is left behind.
	if err := os.Chmod(path, 0o640); err != nil {
		t.Fatal(err)
	}
	if err := Save(path, cfg); err != nil {
		t.Fatal(err)
	}
	if info, _ := os.Stat(path); info.Mode().Perm() != 0o640 {
		t.Errorf("existing mode changed to %v", info.Mode().Perm())
	}
	entries, _ := os.ReadDir(dir)
	if len(entries) != 1 {
		t.Errorf("leftover files in the config directory: %v", entries)
	}
}

func TestLoadFileIgnoresEnvironmentAndDefaults(t *testing.T) {
	t.Setenv("ARR_TUI_RADARR_APIKEY", "from-env")
	path := filepath.Join(t.TempDir(), "config.json")
	os.WriteFile(path, []byte(`{"radarr":{"url":"http://r/","apikey":"from-file"},"sonarr":{"url":"http://s","apikey":"k"},"sabnzbd":{"url":"http://a","apikey":"k"}}`), 0o600)

	raw, err := LoadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if raw.Radarr.APIKey != "from-file" || raw.Radarr.URL != "http://r/" || raw.UI.RefreshSeconds != 0 {
		t.Errorf("raw = %+v: environment, trailing slash trimming and defaults must not be applied", raw)
	}
	eff, err := raw.Effective(os.Getenv)
	if err != nil {
		t.Fatal(err)
	}
	if eff.Radarr.APIKey != "from-env" || eff.Radarr.URL != "http://r" || eff.UI.RefreshSeconds != 3 {
		t.Errorf("effective = %+v", eff)
	}
	if raw.Radarr.APIKey != "from-file" {
		t.Error("Effective must not modify the raw config")
	}
	if got := Overrides(os.Getenv); len(got) != 1 || got["radarr.apikey"] != "ARR_TUI_RADARR_APIKEY" {
		t.Errorf("overrides = %v", got)
	}
}

func TestEffectiveValidates(t *testing.T) {
	raw := &Config{Radarr: Arr{Service: Service{URL: "ftp://x", APIKey: "k"}}}
	if _, err := raw.Effective(func(string) string { return "" }); err == nil {
		t.Error("an invalid config must not become effective")
	}
}