package config

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

func TestLoadSeeds(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.DefaultVersion != "vul" || cfg.Offline {
		t.Errorf("defaults wrong: %+v", cfg)
	}
	// Versions defaults to the corpora actually available in this build, Vulgate
	// first then the rest sorted. Tests build with -tags fullbible, so all four
	// are present (see Makefile); a default vul-only binary would list just vul.
	wantVersions := []string{"vul", "drb", "grb", "wuj"}
	if len(cfg.Versions) != len(wantVersions) {
		t.Errorf("versions default = %v, want %v", cfg.Versions, wantVersions)
	} else {
		for i, v := range wantVersions {
			if cfg.Versions[i] != v {
				t.Errorf("versions default = %v, want %v", cfg.Versions, wantVersions)
				break
			}
		}
	}
	if cfg.Lectionary != "new" {
		t.Errorf("lectionary default wrong: %+v", cfg)
	}
	if _, err := os.Stat(filepath.Join(dir, "lectio", "config.ini")); err != nil {
		t.Error("config not seeded")
	}
}

// TestLoadMigratesBT checks a legacy config still carrying the retired "bt"
// version (both as default_version and in the versions list) loads and is
// migrated to wuj: bt is dropped from the list when wuj is already present
// (no duplicate column) and default_version bt becomes wuj.
func TestLoadMigratesBT(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("LECTIO_CONFIG", filepath.Join(dir, "config.ini"))
	os.WriteFile(filepath.Join(dir, "config.ini"),
		[]byte("default_version = bt\nversions = bt, wuj, vul\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.DefaultVersion != "wuj" {
		t.Errorf("default_version bt not migrated: %q", cfg.DefaultVersion)
	}
	for _, v := range cfg.Versions {
		if v == "bt" {
			t.Errorf("versions still carries bt: %v", cfg.Versions)
		}
	}
	if len(cfg.Versions) != 2 || cfg.Versions[0] != "wuj" || cfg.Versions[1] != "vul" {
		t.Errorf("versions after migration = %v, want [wuj vul]", cfg.Versions)
	}
}

func TestLoadOverride(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	os.MkdirAll(filepath.Join(dir, "lectio"), 0o755)
	os.WriteFile(filepath.Join(dir, "lectio", "config.ini"),
		[]byte("offline = true\ndefault_version = wuj\n"), 0o644)
	cfg, _ := Load()
	if !cfg.Offline || cfg.DefaultVersion != "wuj" {
		t.Errorf("override not applied: %+v", cfg)
	}
}

func TestWebDefaults(t *testing.T) {
	def := Default()
	if def.WebMono {
		t.Errorf("WebMono default should be false")
	}
	if len(def.WebVersions) != 0 {
		t.Errorf("WebVersions default should be empty, got %v", def.WebVersions)
	}
	if def.WebTheme != "transfiguration" {
		t.Errorf("WebTheme default wrong: got %q, want %q", def.WebTheme, "transfiguration")
	}
	if def.WebPort != 0 {
		t.Errorf("WebPort default wrong: got %d, want 0", def.WebPort)
	}
}

func TestWebLoadsFromSeed(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.WebTheme != "transfiguration" {
		t.Errorf("WebTheme from seed wrong: got %q, want %q", cfg.WebTheme, "transfiguration")
	}
	if cfg.WebPort != 0 {
		t.Errorf("WebPort from seed wrong: got %d, want 0", cfg.WebPort)
	}
	if cfg.WebDisplay != "horizontal" {
		t.Errorf("WebDisplay from seed wrong: got %q, want %q", cfg.WebDisplay, "horizontal")
	}
}

func TestWebDisplayDefault(t *testing.T) {
	def := Default()
	if def.WebDisplay != "horizontal" {
		t.Errorf("WebDisplay default wrong: got %q, want %q", def.WebDisplay, "horizontal")
	}
}

func TestWebDisplayLoadsSetting(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	os.MkdirAll(filepath.Join(dir, "lectio"), 0o755)
	os.WriteFile(filepath.Join(dir, "lectio", "config.ini"),
		[]byte("web_display = vertical\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.WebDisplay != "vertical" {
		t.Errorf("WebDisplay = %q, want %q", cfg.WebDisplay, "vertical")
	}
}

func TestWebDisplayNormalizesUnknown(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	os.MkdirAll(filepath.Join(dir, "lectio"), 0o755)
	os.WriteFile(filepath.Join(dir, "lectio", "config.ini"),
		[]byte("web_display = bogus\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.WebDisplay != "horizontal" {
		t.Errorf("WebDisplay = %q, want %q (normalized from bogus)", cfg.WebDisplay, "horizontal")
	}
}

func TestUILanguageDefault(t *testing.T) {
	def := Default()
	if def.UILanguage != "en" {
		t.Errorf("UILanguage default wrong: got %q, want %q", def.UILanguage, "en")
	}
}

func TestUILanguageLoadsPL(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	os.MkdirAll(filepath.Join(dir, "lectio"), 0o755)
	os.WriteFile(filepath.Join(dir, "lectio", "config.ini"),
		[]byte("ui_language = pl\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.UILanguage != "pl" {
		t.Errorf("UILanguage = %q, want %q", cfg.UILanguage, "pl")
	}
}

func TestUILanguagePreservesAnyCode(t *testing.T) {
	// Any ui_language code is kept (lower-cased): it drives day/saint-name
	// localisation via names/<code>.ini. The UI chrome, resolved through
	// i18n.Get, still falls back to English for a code it has no table for.
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	os.MkdirAll(filepath.Join(dir, "lectio"), 0o755)
	os.WriteFile(filepath.Join(dir, "lectio", "config.ini"),
		[]byte("ui_language = FR\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.UILanguage != "fr" {
		t.Errorf("UILanguage = %q, want %q (lower-cased, not clamped)", cfg.UILanguage, "fr")
	}
}

func TestPagerDefault(t *testing.T) {
	def := Default()
	if def.Pager != "" {
		t.Errorf("Pager default should be empty, got %q", def.Pager)
	}
}

func TestPagerLoadsFromSeed(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Pager != "" {
		t.Errorf("Pager from seed wrong: got %q, want empty", cfg.Pager)
	}
}

func TestPagerLoadsSetting(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	os.MkdirAll(filepath.Join(dir, "lectio"), 0o755)
	os.WriteFile(filepath.Join(dir, "lectio", "config.ini"),
		[]byte("pager = less -R\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Pager != "less -R" {
		t.Errorf("Pager = %q, want %q", cfg.Pager, "less -R")
	}
}

func TestSiglaStyleDefaultsAndDialect(t *testing.T) {
	if got := Default().SiglaStyle; got != "auto" {
		t.Errorf("default SiglaStyle=%q want auto", got)
	}
	cases := []struct{ style, ui, want string }{
		{"auto", "en", "en"},
		{"auto", "pl", "pl"},
		{"polish", "en", "pl"},
		{"english", "pl", "en"},
	}
	for _, c := range cases {
		cfg := Config{SiglaStyle: NormalizeSiglaStyle(c.style), UILanguage: c.ui}
		if got := cfg.SiglaLang(); got != c.want {
			t.Errorf("SiglaLang(style=%q,ui=%q)=%q want %q", c.style, c.ui, got, c.want)
		}
	}
	if NormalizeSiglaStyle("nonsense") != "auto" {
		t.Error("unknown sigla_style should normalize to auto")
	}
}

func TestSaveRoundTrip(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.ini")
	t.Setenv("LECTIO_CONFIG", path)

	cfg := Default()
	cfg.UILanguage = "pl"
	cfg.SiglaStyle = "english"
	cfg.WebMono = true
	cfg.WebVersions = []string{"wuj", "vul"}
	cfg.Pager = "less -R"
	cfg.Parts = map[string]map[string]bool{"new": {"psalm": false}}
	if err := Save(cfg); err != nil {
		t.Fatal(err)
	}
	got, err := Load()
	if err != nil {
		t.Fatalf("reload: %v", err)
	}
	if got.UILanguage != "pl" || got.SiglaStyle != "english" || !got.WebMono ||
		len(got.WebVersions) != 2 || got.Pager != "less -R" || got.PartShown("new", "psalm") {
		t.Errorf("round-trip mismatch: %+v", got)
	}
}

func TestSelectionFromINI(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("LECTIO_CONFIG", filepath.Join(dir, "config.ini"))
	os.WriteFile(filepath.Join(dir, "config.ini"),
		[]byte("lectionary = new\n[calendar]\nepiphany = sunday\nascension = sunday\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	sel := cfg.Selection()
	if sel.Form != "new" || sel.Epiphany != "sunday" || sel.Ascension != "sunday" || sel.CorpusChristi != "thursday" {
		t.Fatalf("selection = %+v", sel)
	}
}

func TestUseLayers(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("LECTIO_CONFIG", filepath.Join(dir, "config.ini"))
	os.WriteFile(filepath.Join(dir, "config.ini"), []byte("use = poland, krakow\n"), 0o644)
	cfg, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if len(cfg.Use) != 2 || cfg.Use[0] != "poland" || cfg.Use[1] != "krakow" {
		t.Fatalf("Use = %v", cfg.Use)
	}
	// round-trips through Save
	if err := Save(cfg); err != nil {
		t.Fatal(err)
	}
	got, _ := Load()
	if len(got.Use) != 2 || got.Use[1] != "krakow" {
		t.Errorf("Use after round-trip = %v", got.Use)
	}
}

func TestPartShown(t *testing.T) {
	var empty Config
	if !empty.PartShown("new", "psalm") {
		t.Error("nil Parts: psalm should be shown")
	}
	if !empty.PartShown("new", "ewangelia") {
		t.Error("nil Parts: ewangelia should be shown")
	}

	hidden := Config{Parts: map[string]map[string]bool{
		"new": {"psalm": false},
	}}
	if hidden.PartShown("new", "psalm") {
		t.Error("psalm explicitly false should be hidden")
	}
	if !hidden.PartShown("new", "ewangelia") {
		t.Error("ewangelia not mentioned should still be shown")
	}
}

func TestReadingCorpusResolution(t *testing.T) {
	// drb is an embedded corpus with lang=en.
	c := Config{ReadingVersion: "drb"}
	if got := c.ReadingCorpus(); got != "drb" {
		t.Fatalf("explicit reading_version: got %q", got)
	}
	c = Config{ReadingLang: "en"}
	if got := c.ReadingCorpus(); got != "drb" {
		t.Fatalf("reading_lang match: got %q", got)
	}
	c = Config{UILanguage: "en"}
	if got := c.ReadingCorpus(); got != "drb" {
		t.Fatalf("ui_language fallback: got %q", got)
	}
	c = Config{UILanguage: "pl"} // no pl corpus embedded
	if got := c.ReadingCorpus(); got != "" {
		t.Fatalf("no match should be empty: got %q", got)
	}
}