package readings

import (
	"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)
	}
}

// TestLoadModern computes the Ordinary Form day offline: the gospel section is
// present and the header carries the celebration name (English by default,
// since the universal sanctoral is authored in English).
func TestLoadModern(t *testing.T) {
	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, "Mary Magdalene") {
		t.Errorf("DayInfo.Name = %q, want it to contain %q", info.Name, "Mary Magdalene")
	}
}

// TestSundayRankIsDisplayOnly guards the Ordinary Form's Sunday display rank.
// Sunday is its own category in the 1969 Universal Norms' Table of Liturgical
// Days -- never a solemnity -- so an ordinary "Nth Sunday of <season>" temporal
// day (Ordinary Time, Advent, Lent, the Easter season, Christmas time; this
// also covers Palm Sunday) must report "sunday". A NAMED solemnity of the Lord
// that happens to fall on a Sunday (Easter Sunday itself, Pentecost) is a
// genuine solemnity and must keep reporting "solemnity"; a feast of the Lord
// (Holy Family) must keep reporting "feast". This is display-only: it must
// never touch the engine's internal precedence, so the 1962 form (which has no
// such Sunday category -- Sundays report their class exactly as before) is
// asserted unchanged too. Dates are the ones from the original bug report,
// plus the Easter/Pentecost/Holy Family dates they imply for the same
// liturgical year.
func TestSundayRankIsDisplayOnly(t *testing.T) {
	cases := []struct {
		date, lect, wantRank, why string
	}{
		{"2026-08-09", "new", "sunday", "19th Sunday in Ordinary Time"},
		{"2026-11-29", "new", "sunday", "1st Sunday of Advent"},
		{"2027-03-28", "new", "solemnity", "Easter Sunday itself"},
		{"2027-05-16", "new", "solemnity", "Pentecost"},
		{"2026-12-27", "new", "feast", "Holy Family"},
		{"2026-08-09", "traditional", "class-2", "1962 Sunday after Pentecost"},
		{"2026-11-29", "traditional", "class-1", "1962 1st Sunday of Advent"},
	}
	for _, c := range cases {
		cfg := config.Config{Lectionary: c.lect}
		_, info, err := Load(cfg, Options{Date: c.date, All: true})
		if err != nil {
			t.Fatalf("%s (%s, %s): Load: %v", c.date, c.lect, c.why, err)
		}
		if info.Rank != c.wantRank {
			t.Errorf("%s (%s, %s): Rank = %q, want %q (name=%q)", c.date, c.lect, c.why, info.Rank, c.wantRank, info.Name)
		}
	}
}

// TestLoadTraditional computes the Extraordinary Form day offline: it never
// needs the network, and yields the EF epistle+gospel with a header name.
func TestLoadTraditional(t *testing.T) {
	cfg := config.Config{Lectionary: "traditional"}
	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 == "evangelium" {
			found = true
		}
	}
	if !found {
		t.Errorf("no EF gospel section (PartID=evangelium) found in %+v", secs)
	}
	if info.Name == "" {
		t.Error("DayInfo.Name empty for a traditional feast day")
	}
}