package web

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

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

func TestRenderReadings(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Ewangelia (J 20, 1. 11-18)", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"wuj"}, "new", "horizontal", "pl", liturgy.DayInfo{}))
	if !strings.Contains(html, "Ewangelia") || !strings.Contains(html, "class=") {
		t.Errorf("reading pane missing heading/classes: %q", html[:min(200, len(html))])
	}
}

// TestRenderReadingsDayInfoHeader checks RenderReadings prepends a
// "<p class="dayinfo">" header carrying the celebration Name (heading role)
// and Season (citation role, muted) ahead of the reading sections, and that
// it reuses the existing role classes rather than inventing new ones.
func TestRenderReadingsDayInfoHeader(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Ewangelia (J 20, 1. 11-18)", PartID: "ewangelia"}}
	info := liturgy.DayInfo{Name: "Święto św. Marii Magdaleny", Colour: "white"}
	html := string(RenderReadings(secs, []string{"wuj"}, "new", "horizontal", "pl", info))
	if !strings.Contains(html, `class="dayinfo"`) {
		t.Errorf("missing dayinfo header: %q", html[:min(300, len(html))])
	}
	if !strings.Contains(html, "Święto św. Marii Magdaleny") {
		t.Errorf("dayinfo header missing the day name: %q", html[:min(300, len(html))])
	}
	if i := strings.Index(html, `class="dayinfo"`); i > strings.Index(html, "reading-section") && strings.Index(html, "reading-section") != -1 {
		t.Errorf("dayinfo header should come before the reading sections: %q", html[:min(400, len(html))])
	}
}

// TestRenderReadingsDayInfoSeason checks the Season (traditional lectionary
// only) renders as a muted citation-role span alongside Name.
func TestRenderReadingsDayInfoSeason(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Gospel", PartID: "evangelium"}}
	info := liturgy.DayInfo{Name: "St. Mary Magdalene", Season: "Feria IV after VIII Sunday after Pentecost", Colour: "white"}
	html := string(RenderReadings(secs, []string{"wuj"}, "traditional", "horizontal", "en", info))
	if !strings.Contains(html, "Feria IV after VIII Sunday after Pentecost") {
		t.Errorf("dayinfo header missing Season: %q", html[:min(400, len(html))])
	}
}

// TestRenderReadingsNoDayInfoHeaderWhenEmpty checks the header is entirely
// omitted (never an empty/error stub) when the source yielded no DayInfo.
func TestRenderReadingsNoDayInfoHeaderWhenEmpty(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Ewangelia (J 20, 1. 11-18)", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"wuj"}, "new", "horizontal", "pl", liturgy.DayInfo{}))
	if strings.Contains(html, `class="dayinfo"`) {
		t.Errorf("dayinfo header should be omitted when Name is empty: %q", html)
	}
}

func TestBuiltinThemes(t *testing.T) {
	t.Setenv("XDG_CONFIG_HOME", t.TempDir()) // no user themes
	for _, name := range []string{
		"transfiguration", "desert_fathers", "benedictines", "franciscans",
		"memento_mori", "dominicans", "advent", "nativity", "lent",
		"easter", "pentecost", "ordinary", "epiphany", "marian",
	} {
		if b, err := themeCSS(name); err != nil || len(b) == 0 {
			t.Errorf("built-in theme %s not embedded: %v", name, err)
		}
	}
}

func TestThemeCSSGuardRejectsInvalidNames(t *testing.T) {
	t.Setenv("XDG_CONFIG_HOME", t.TempDir()) // no user themes
	for _, name := range []string{"../../etc/passwd", "..", "a/b", ""} {
		if _, err := themeCSS(name); err == nil {
			t.Errorf("themeCSS(%q): expected error, got nil", name)
		}
	}
}

func TestRenderReadingsEscapesScriptText(t *testing.T) {
	// An attacker-controlled version code (?v=... reaches RenderReadings
	// unfiltered) flows to render.GatherVersion as both the column label and the
	// "(not in %s)" note. RenderReadings must HTML-escape it: it renders through
	// html/template, never wrapping untrusted text in template.HTML.
	const evil = "<script>alert(1)</script>"
	secs := []liturgy.Section{{
		Heading:  "Ewangelia",
		Citation: "J 20, 1. 11-18",
		Ref:      "John 20:1,11-18",
		PartID:   "pierwsze_czytanie",
	}}
	html := string(RenderReadings(secs, []string{evil}, "new", "horizontal", "pl", liturgy.DayInfo{}))
	if strings.Contains(html, evil) {
		t.Errorf("raw <script> leaked into rendered output: %q", html)
	}
	if !strings.Contains(html, "&lt;script&gt;alert(1)&lt;/script&gt;") {
		t.Errorf("expected escaped script tag in output: %q", html)
	}
}

func TestRenderReadingsVertical(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Ewangelia (J 20, 1. 11-18)", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"wuj", "vul"}, "new", "vertical", "pl", liturgy.DayInfo{}))
	if !strings.Contains(html, "display-vertical") {
		t.Errorf("vertical output missing display-vertical container: %q", html[:min(300, len(html))])
	}
	if !strings.Contains(html, "vcol") {
		t.Errorf("vertical output missing vcol columns: %q", html[:min(300, len(html))])
	}
	if !strings.Contains(html, "Wujek") || !strings.Contains(html, "Wulgata") {
		t.Errorf("vertical output missing both version labels: %q", html[:min(300, len(html))])
	}
}

func TestRenderReadingsInterlinear(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Ewangelia", Citation: "J 20, 1. 11-18", Ref: "John 20:1,11-18", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"wuj", "vul"}, "new", "interlinear", "pl", liturgy.DayInfo{}))
	if !strings.Contains(html, "ilverse") {
		t.Errorf("interlinear output missing ilverse: %q", html[:min(300, len(html))])
	}
	if !strings.Contains(html, `class="vnum"`) {
		t.Errorf("interlinear output missing vnum: %q", html[:min(300, len(html))])
	}
	// The first ilverse block should group both version labels under one key.
	// Bound it by the next vnum span (each ilverse carries exactly one). The
	// Wujek line appears only when the optional wuj corpus is embedded and
	// contributes versified text to the alignment.
	t.Run("both version labels", func(t *testing.T) {
		requireCorpus(t, "wuj")
		i := strings.Index(html, `class="vnum"`)
		block := html[i:]
		if j := strings.Index(html[i+1:], `class="vnum"`); j != -1 {
			block = html[i : i+1+j]
		}
		if !strings.Contains(block, "Wujek") || !strings.Contains(block, "Wulgata") {
			t.Errorf("first interlinear verse block missing both version labels: %q", block)
		}
	})
}

func TestRenderReadingsInterlinearExcludesBT(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Ewangelia", Citation: "J 20, 1. 11-18", Ref: "John 20:1,11-18", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"bt", "vul"}, "new", "interlinear", "pl", liturgy.DayInfo{}))
	// bt is dropped before rendering regardless, so its own label never shows.
	if strings.Contains(html, "Biblia Tysiąclecia (niedziela.pl)") {
		t.Errorf("interlinear output should substitute wuj for bt, not carry bt's label: %q", html[:min(300, len(html))])
	}
	// bt maps to wuj, but the Wujek label only renders when wuj is embedded and
	// supplies versified text to the alignment.
	t.Run("wuj substituted", func(t *testing.T) {
		requireCorpus(t, "wuj")
		if !strings.Contains(html, "Wujek") {
			t.Errorf("interlinear output should substitute wuj for bt: %q", html[:min(300, len(html))])
		}
	})
}

func TestRenderReadingsInterlinearNoVersifiedNote(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Bez odwołania", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"wuj"}, "new", "interlinear", "pl", liturgy.DayInfo{}))
	if strings.Contains(html, "ilverse") {
		t.Errorf("expected no ilverse blocks when nothing resolves: %q", html)
	}
	if !strings.Contains(html, "brak wersetów do zestawienia interlinearnego") {
		t.Errorf("pl no-verses note missing/wrong: %q", html)
	}
}

// TestRenderReadingsInterlinearNoVersifiedNoteLang checks the interlinear
// "no verses to align" note (finding §1) follows lang, not always Polish.
func TestRenderReadingsInterlinearNoVersifiedNoteLang(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Bez odwołania", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"wuj"}, "new", "interlinear", "en", liturgy.DayInfo{}))
	if !strings.Contains(html, "(no verses to align)") {
		t.Errorf("en no-verses note missing/wrong: %q", html)
	}
	if strings.Contains(html, "brak wersetów") {
		t.Errorf("en output should not carry the Polish no-verses note: %q", html)
	}
}

// TestRenderReadingsLocalizesEN checks that lang="en" localises both the
// version-column label (via render.GatherVersion) and the section heading's
// part-label word (via render.LocalizeHeading, brief §3b), while the
// citation stays exactly as scraped.
func TestRenderReadingsLocalizesEN(t *testing.T) {
	secs := []liturgy.Section{{Heading: "Ewangelia (J 20, 1. 11-18)", PartID: "ewangelia"}}
	html := string(RenderReadings(secs, []string{"vul"}, "new", "horizontal", "en", liturgy.DayInfo{}))
	if !strings.Contains(html, "Gospel (J 20, 1. 11-18)") {
		t.Errorf("en output missing localised heading: %q", html[:min(300, len(html))])
	}
	if !strings.Contains(html, "Vulgate (Latin)") {
		t.Errorf("en output missing localised version label: %q", html[:min(300, len(html))])
	}
	if strings.Contains(html, "Ewangelia") {
		t.Errorf("en output should not carry the Polish heading label: %q", html[:min(300, len(html))])
	}
}

func TestRenderPassageColumns(t *testing.T) {
	html := string(RenderPassage("John", "John", 3, []string{"wuj"}, "vertical", "en", nil))
	if !strings.Contains(html, "John 3") { // passage heading, independent of the corpus
		t.Errorf("passage columns missing heading:\n%s", html)
	}
	t.Run("verse", func(t *testing.T) {
		requireCorpus(t, "wuj") // the verse text comes from the optional wuj corpus
		if !strings.Contains(html, "3:16") {
			t.Errorf("passage columns missing verse:\n%s", html)
		}
	})
}

func TestRenderPassageInterlinear(t *testing.T) {
	html := string(RenderPassage("John", "John", 3, []string{"wuj", "vul"}, "interlinear", "en", nil))
	if !strings.Contains(html, "3:16") {
		t.Errorf("interlinear missing verse:\n%s", html)
	}
}

func TestRenderPassageMissingVersion(t *testing.T) {
	// A non-existent chapter yields no verses: the column must carry the
	// "(not in wuj)" note, never a panic or an empty column.
	html := string(RenderPassage("John", "John", 999, []string{"wuj"}, "vertical", "en", nil))
	if !strings.Contains(html, "wuj") {
		t.Errorf("missing-passage note absent:\n%s", html)
	}
}

func TestUserTheme(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	td := filepath.Join(dir, "lectio", "themes")
	os.MkdirAll(td, 0o755)
	os.WriteFile(filepath.Join(td, "mine.css"), []byte(".heading{color:#f00}"), 0o644)
	found := false
	for _, n := range Themes() {
		if n == "mine" {
			found = true
		}
	}
	if !found {
		t.Error("user theme 'mine' not listed by Themes()")
	}
	if b, err := themeCSS("mine"); err != nil || len(b) == 0 {
		t.Errorf("user theme not read: %v", err)
	}
}