package readings

import (
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/lukaszkasprzak/lectio/internal/config"
	"github.com/lukaszkasprzak/lectio/internal/liturgy"
)

func sectionsForFilterTests() []liturgy.Section {
	return []liturgy.Section{
		{PartID: "pierwsze_czytanie", Heading: "1. czytanie"},
		{PartID: "psalm", Heading: "Psalm"},
		{PartID: "ewangelia", Heading: "Ewangelia"},
	}
}

func TestFilterPartsGospelOnly(t *testing.T) {
	secs := sectionsForFilterTests()
	got := filterParts(secs, config.Config{}, false)

	if len(got) != 1 {
		t.Fatalf("got %d sections, want 1: %+v", len(got), got)
	}
	if got[0].PartID != "ewangelia" {
		t.Errorf("got PartID %q, want ewangelia", got[0].PartID)
	}
}

func TestFilterPartsAll(t *testing.T) {
	secs := sectionsForFilterTests()
	cfg := config.Config{
		Lectionary: "new",
		Parts: map[string]map[string]bool{
			"new": {"psalm": false},
		},
	}
	got := filterParts(secs, cfg, true)

	if len(got) != 2 {
		t.Fatalf("got %d sections, want 2: %+v", len(got), got)
	}
	for _, s := range got {
		if s.PartID == "psalm" {
			t.Errorf("psalm should have been filtered out: %+v", got)
		}
	}
	ids := map[string]bool{got[0].PartID: true, got[1].PartID: true}
	if !ids["pierwsze_czytanie"] || !ids["ewangelia"] {
		t.Errorf("got %+v, want pierwsze_czytanie and ewangelia", got)
	}
}

func TestFilterPartsTraditionalAllReadingsOnly(t *testing.T) {
	secs := []liturgy.Section{
		{PartID: "introitus", Heading: "Introit"},
		{PartID: "oratio", Heading: "Kolekta"},
		{PartID: "lectio", Heading: "Lekcja"},
		{PartID: "graduale", Heading: "Graduał"},
		{PartID: "evangelium", Heading: "Ewangelia"},
		{PartID: "offertorium", Heading: "Ofiarowanie"},
		{PartID: "secreta", Heading: "Sekreta"},
		{PartID: "communio", Heading: "Komunia"},
		{PartID: "postcommunio", Heading: "Pokomunia"},
	}
	cfg := config.Config{Lectionary: "traditional"}
	got := filterParts(secs, cfg, true)

	if len(got) != 2 {
		t.Fatalf("got %d sections, want 2: %+v", len(got), got)
	}
	if got[0].PartID != "lectio" || got[1].PartID != "evangelium" {
		t.Errorf("got %+v, want [lectio evangelium] in order", got)
	}
}

func TestLoadModernRoutes(t *testing.T) {
	html, err := os.ReadFile("../liturgy/testdata/2026-07-22.html")
	if err != nil {
		t.Fatal(err)
	}
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write(html)
	}))
	defer srv.Close()
	liturgy.SetBaseURL(srv.URL + "/liturgia/%s/Ewangelia")
	t.Setenv("XDG_CACHE_HOME", t.TempDir())

	cfg := config.Config{Lectionary: "new"}
	secs, info, err := Load(cfg, Options{Date: "2026-07-22", All: true})
	if err != nil {
		t.Fatalf("Load: %v", err)
	}

	found := false
	for _, s := range secs {
		if s.PartID == "ewangelia" {
			found = true
		}
	}
	if !found {
		t.Errorf("no gospel section (PartID=ewangelia) found in %+v", secs)
	}
	if !strings.Contains(info.Name, "Marii Magdaleny") {
		t.Errorf("DayInfo.Name = %q, want it to contain %q", info.Name, "Marii Magdaleny")
	}
}

// TestLoadTraditionalOfflineErrorsWithoutCache exercises the (formerly
// unsupported) traditional+offline path when nothing has been cached yet
// for that date/lang: it must fail clearly rather than silently falling
// back to the network or to the modern lectionary's sigla store.
func TestLoadTraditionalOfflineErrorsWithoutCache(t *testing.T) {
	t.Setenv("XDG_CACHE_HOME", t.TempDir())

	cfg := config.Config{Lectionary: "traditional", TraditionalLang: "pl"}
	_, _, err := Load(cfg, Options{Date: "2026-07-22", Offline: true})
	if err == nil {
		t.Fatal("expected error, got nil")
	}
	msg := strings.ToLower(err.Error())
	if !strings.Contains(msg, "no cached") {
		t.Errorf("error %q should mention no cached propers", err.Error())
	}
}

// TestLoadTraditionalOfflineReadsCache is the positive counterpart: once a
// prior online Load (or 'lectio update') has cached a date's traditional
// propers, Load(offline=true) must serve them from disk, no network
// involved.
func TestLoadTraditionalOfflineReadsCache(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CACHE_HOME", dir)
	cacheDir := filepath.Join(dir, "lectio")
	if err := os.MkdirAll(cacheDir, 0o755); err != nil {
		t.Fatal(err)
	}
	body, err := os.ReadFile("../tradlit/testdata/2026-07-22.json")
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(cacheDir, "2026-07-22.trad.pl.json"), body, 0o644); err != nil {
		t.Fatal(err)
	}

	cfg := config.Config{Lectionary: "traditional", TraditionalLang: "pl"}
	secs, info, err := Load(cfg, Options{Date: "2026-07-22", Offline: true, All: true})
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if len(secs) == 0 {
		t.Error("expected traditional offline sections, got none")
	}
	if info.Name != "St. Mary Magdalene" {
		t.Errorf("DayInfo.Name = %q, want %q", info.Name, "St. Mary Magdalene")
	}
}