class_name Style
## Farben, Schriften, Theme und Zeichenhilfen.

const FONT: FontFile = preload("res://assets/fonts/DejaVuSans.ttf")
static var font_scale := 1.0  # Einstellung „Große Schrift“


static func fs(size: int) -> int:
    return int(round(size * font_scale))
const FONT_BOLD: FontFile = preload("res://assets/fonts/DejaVuSans-Bold.ttf")

const BG := Color("1a1c24")
const PANEL := Color("282b36")
const PANEL_LIGHT := Color("3a3e4c")
const TEXT := Color("ececf0")
const MUTED := Color("9698a5")
const GOLD := Color("f5c850")
const GREEN := Color("5ad282")
const RED := Color("e65555")
const BLUE := Color("6eaaf0")
const YELLOW := Color("ffe65a")
const ORANGE := Color("ff963c")


static func darker(c: Color, f: float = 0.65) -> Color:
    return Color(c.r * f, c.g * f, c.b * f, c.a)


static func lighter(c: Color, d: float = 0.1) -> Color:
    return Color(minf(1, c.r + d), minf(1, c.g + d), minf(1, c.b + d), c.a)


static func box(bg: Color, radius: int = 8, border_col = null, border_w: int = 0) -> StyleBoxFlat:
    var sb := StyleBoxFlat.new()
    sb.bg_color = bg
    sb.set_corner_radius_all(radius)
    if border_col != null:
        sb.border_color = border_col
        sb.set_border_width_all(border_w)
    return sb


static func make_theme() -> Theme:
    var t := Theme.new()
    t.default_font = FONT
    t.default_font_size = fs(16)
    t.set_stylebox("normal", "Button", box(PANEL_LIGHT, 8, MUTED, 2))
    t.set_stylebox("hover", "Button", box(lighter(PANEL_LIGHT), 8, MUTED, 2))
    t.set_stylebox("pressed", "Button", box(darker(PANEL_LIGHT), 8, MUTED, 2))
    t.set_stylebox("disabled", "Button", box(darker(PANEL, 0.9), 8, PANEL, 2))
    t.set_stylebox("focus", "Button", box(Color(0, 0, 0, 0), 8, GOLD, 3))
    for name in ["font_color", "font_hover_color", "font_pressed_color", "font_focus_color", "font_hover_pressed_color"]:
        t.set_color(name, "Button", TEXT)
    t.set_color("font_disabled_color", "Button", MUTED)
    t.set_font_size("font_size", "Button", fs(18))
    t.set_color("font_color", "Label", TEXT)
    t.set_stylebox("panel", "Panel", box(PANEL, 8))
    t.set_stylebox("normal", "RichTextLabel", StyleBoxEmpty.new())
    t.set_stylebox("focus", "RichTextLabel", StyleBoxEmpty.new())
    t.set_stylebox("panel", "ScrollContainer", StyleBoxEmpty.new())
    t.set_stylebox("normal", "LineEdit", box(PANEL_LIGHT, 6, MUTED, 1))
    t.set_stylebox("focus", "LineEdit", box(PANEL_LIGHT, 6, BLUE, 2))
    t.set_color("font_color", "LineEdit", TEXT)
    t.set_color("font_placeholder_color", "LineEdit", MUTED)
    t.set_stylebox("normal", "OptionButton", box(PANEL_LIGHT, 6, MUTED, 1))
    t.set_stylebox("hover", "OptionButton", box(lighter(PANEL_LIGHT), 6, MUTED, 1))
    t.set_stylebox("pressed", "OptionButton", box(darker(PANEL_LIGHT), 6, MUTED, 1))
    t.set_stylebox("focus", "OptionButton", StyleBoxEmpty.new())
    t.set_color("font_color", "OptionButton", TEXT)
    t.set_color("font_color", "CheckButton", TEXT)
    t.set_stylebox("focus", "CheckButton", StyleBoxEmpty.new())
    return t


# --- Knoten-Hilfen -------------------------------------------------------------

static func panel(parent: Node, rect: Rect2, bg: Color = PANEL, radius: int = 8, border_col = null, border_w: int = 0) -> Panel:
    var p := Panel.new()
    p.position = rect.position
    p.size = rect.size
    p.add_theme_stylebox_override("panel", box(bg, radius, border_col, border_w))
    p.mouse_filter = Control.MOUSE_FILTER_IGNORE
    parent.add_child(p)
    return p


static func label(parent: Node, text: String, size: int, color: Color, rect: Rect2, align: String = "left", bold: bool = false) -> Label:
    var l := Label.new()
    l.text = text
    l.position = rect.position
    l.size = rect.size
    l.add_theme_font_size_override("font_size", fs(size))
    l.add_theme_color_override("font_color", color)
    if bold:
        l.add_theme_font_override("font", FONT_BOLD)
    match align:
        "center":
            l.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
        "right":
            l.horizontal_alignment = HORIZONTAL_ALIGNMENT_RIGHT
    l.mouse_filter = Control.MOUSE_FILTER_IGNORE
    parent.add_child(l)
    return l


static func button(parent: Node, text: String, rect: Rect2, on_pressed: Callable, color = null) -> Button:
    var b := Button.new()
    b.text = text
    b.position = rect.position
    b.size = rect.size
    b.pressed.connect(on_pressed)
    if color != null:
        b.add_theme_stylebox_override("normal", box(color, 8, MUTED, 2))
        b.add_theme_stylebox_override("hover", box(lighter(color), 8, MUTED, 2))
        b.add_theme_stylebox_override("pressed", box(darker(color), 8, MUTED, 2))
    parent.add_child(b)
    return b


## Vertikal zentrierte Spalte (Container-Layout für Menübildschirme).
static func column(parent: Node, width: float, top: float, sep: int = 12) -> VBoxContainer:
    var v := VBoxContainer.new()
    v.anchor_left = 0.5
    v.anchor_right = 0.5
    v.anchor_top = 0
    v.anchor_bottom = 0
    v.offset_left = -width / 2
    v.offset_right = width / 2
    v.offset_top = top
    v.add_theme_constant_override("separation", sep)
    v.mouse_filter = Control.MOUSE_FILTER_IGNORE
    parent.add_child(v)
    return v


static func row(parent: Node, sep: int = 12) -> HBoxContainer:
    var h := HBoxContainer.new()
    h.add_theme_constant_override("separation", sep)
    h.mouse_filter = Control.MOUSE_FILTER_IGNORE
    parent.add_child(h)
    return h


## Label in einem Container.
static func clabel(parent: Node, text: String, size: int, color: Color, align: String = "center", bold: bool = false, min_w: float = 0) -> Label:
    var l := label(parent, text, size, color, Rect2(0, 0, 0, 0), align, bold)
    l.size_flags_horizontal = Control.SIZE_EXPAND_FILL if min_w == 0 else Control.SIZE_FILL
    if min_w > 0:
        l.custom_minimum_size = Vector2(min_w, 0)
    return l


## Knopf in einem Container.
static func cbutton(parent: Node, text: String, size: Vector2, on_pressed: Callable, color = null) -> Button:
    var b := button(parent, text, Rect2(Vector2.ZERO, size), on_pressed, color)
    b.custom_minimum_size = size
    return b


static func spacer(parent: Node, h: float) -> Control:
    var c := Control.new()
    c.custom_minimum_size = Vector2(0, h)
    c.mouse_filter = Control.MOUSE_FILTER_IGNORE
    parent.add_child(c)
    return c


## Unsichtbare Vollbild-Ebene mit abgedunkeltem Hintergrund, die Klicks schluckt.
static func overlay(parent: Node) -> Control:
    var o := Control.new()
    o.set_anchors_preset(Control.PRESET_FULL_RECT)
    o.visible = false
    var dark := ColorRect.new()
    dark.color = Color(0, 0, 0, 0.67)
    dark.set_anchors_preset(Control.PRESET_FULL_RECT)
    dark.mouse_filter = Control.MOUSE_FILTER_STOP
    o.add_child(dark)
    parent.add_child(o)
    return o


## Bestätigungsdialog (unsichtbar): Titel, Hinweis, Ja-Knopf mit Aktion und ein Abbrechen-Knopf.
static func confirm(parent: Node, title: String, text: String, yes: String, on_yes: Callable, no: String = "Abbrechen", color: Color = MUTED) -> Control:
    var o := overlay(parent)
    panel(o, Rect2(340, 290, 600, 200), PANEL, 10, color, 2)
    label(o, title, 26, TEXT, Rect2(340, 312, 600, 40), "center", true)
    label(o, text, 16, MUTED, Rect2(340, 360, 600, 24), "center")
    button(o, yes, Rect2(380, 420, 240, 46), on_yes, Color("5a2828"))
    button(o, no, Rect2(660, 420, 240, 46), func(): o.visible = false)
    return o


static func clear(node: Node) -> void:
    for c in node.get_children():
        node.remove_child(c)
        c.queue_free()


# --- Zeichenhilfen für _draw() ---------------------------------------------------

static func text(ci: CanvasItem, s: String, size_in: int, color: Color, pos: Vector2, anchor: String = "topleft", bold: bool = false) -> void:
    var size := fs(size_in)
    var font: Font = FONT_BOLD if bold else FONT
    var dim := font.get_string_size(s, HORIZONTAL_ALIGNMENT_LEFT, -1, size)
    var x := pos.x
    var y := pos.y
    match anchor:
        "center":
            x -= dim.x / 2
            y -= dim.y / 2
        "midtop":
            x -= dim.x / 2
        "topright":
            x -= dim.x
        "midleft":
            y -= dim.y / 2
        "midright":
            x -= dim.x
            y -= dim.y / 2
        "bottomleft":
            y -= dim.y
        "bottomright":
            x -= dim.x
            y -= dim.y
        "midbottom":
            x -= dim.x / 2
            y -= dim.y
    ci.draw_string(font, Vector2(x, y + font.get_ascent(size)), s, HORIZONTAL_ALIGNMENT_LEFT, -1, size, color)


static func fit(s: String, bold: bool, size: int, max_w: float) -> String:
    var font: Font = FONT_BOLD if bold else FONT
    while font.get_string_size(s, HORIZONTAL_ALIGNMENT_LEFT, -1, size).x > max_w and s.length() > 3:
        s = s.substr(0, s.length() - 2) + "…"
    return s


static func border(ci: CanvasItem, rect: Rect2, color: Color, width: int, radius: int) -> void:
    var sb := StyleBoxFlat.new()
    sb.draw_center = false
    sb.border_color = color
    sb.set_border_width_all(width)
    sb.set_corner_radius_all(radius)
    ci.draw_style_box(sb, rect)


static func fill_elements(ci: CanvasItem, rect: Rect2, elements: Array, radius: int = 8) -> void:
    var a: Color = Cards.ELEMENT_COLORS[elements[0]]
    if elements.size() == 1:
        ci.draw_style_box(box(a, radius), rect)
    elif elements[0] == elements[1]:
        # Doppeltes Element: gleiche Farbe mit zweitem, hellem Innenrahmen
        ci.draw_style_box(box(a, radius), rect)
        border(ci, rect.grow(-5), lighter(a, 0.27), 2, maxi(2, radius - 3))
    else:
        var b: Color = Cards.ELEMENT_COLORS[elements[1]]
        var half := floorf(rect.size.x / 2)
        var left := StyleBoxFlat.new()
        left.bg_color = a
        left.corner_radius_top_left = radius
        left.corner_radius_bottom_left = radius
        var right := StyleBoxFlat.new()
        right.bg_color = b
        right.corner_radius_top_right = radius
        right.corner_radius_bottom_right = radius
        ci.draw_style_box(left, Rect2(rect.position, Vector2(half, rect.size.y)))
        ci.draw_style_box(right, Rect2(rect.position + Vector2(half, 0), Vector2(rect.size.x - half, rect.size.y)))


# --- Kartensymbole (prozedural, je Element und Kartenart) --------------------------

static func glyph(ci: CanvasItem, card, center: Vector2, size: float) -> void:
    var variant := absi(hash(card.id)) % 3
    var col := lighter(Cards.ELEMENT_COLORS[card.elements[0]], 0.38)
    col.a = 0.95
    if card.is_trap():
        # Falle: Kreuz im Kreis
        ci.draw_arc(center, size * 0.5, 0, TAU, 32, col, maxf(2, size * 0.08))
        var d := size * 0.28
        ci.draw_line(center + Vector2(-d, -d), center + Vector2(d, d), col, maxf(2, size * 0.1))
        ci.draw_line(center + Vector2(-d, d), center + Vector2(d, -d), col, maxf(2, size * 0.1))
        return
    if card.kind == "Zauber":
        _star(ci, center, size * 0.55, Color(col, 0.35))
    var elems: Array = card.elements
    if elems.size() >= 2 and elems[0] != elems[1]:
        _element_glyph(ci, elems[0], center + Vector2(-size * 0.28, 0), size * 0.62, variant, col)
        var col2 := lighter(Cards.ELEMENT_COLORS[elems[1]], 0.38)
        col2.a = 0.95
        _element_glyph(ci, elems[1], center + Vector2(size * 0.28, 0), size * 0.62, variant, col2)
    else:
        _element_glyph(ci, elems[0], center, size, variant, col)
        if elems.size() >= 2:
            ci.draw_arc(center, size * 0.6, 0, TAU, 32, Color(col, 0.7), 2)
        if elems.size() >= 3:
            ci.draw_arc(center, size * 0.72, 0, TAU, 40, Color(col, 0.5), 2)


static func _star(ci: CanvasItem, c: Vector2, r: float, col: Color) -> void:
    var pts := PackedVector2Array()
    for i in 8:
        var a := TAU * i / 8 - PI / 2
        var rr := r if i % 2 == 0 else r * 0.45
        pts.append(c + Vector2(cos(a), sin(a)) * rr)
    ci.draw_colored_polygon(pts, col)


static func _element_glyph(ci: CanvasItem, element: String, c: Vector2, size: float, variant: int, col: Color) -> void:
    var h := size / 2
    match element:
        "Feuer":
            var n := 1 + variant
            for i in n:
                var off := Vector2((i - (n - 1) / 2.0) * size * 0.32, 0)
                var s := 1.0 if i == n / 2 else 0.7
                _flame(ci, c + off, h * s, col)
        "Wasser":
            for i in 2 + variant % 2:
                var y := c.y + (i - 0.5) * size * 0.3
                for k in 3:
                    var x := c.x - size * 0.4 + k * size * 0.4
                    ci.draw_arc(Vector2(x, y), size * 0.2, PI, TAU, 12, col, maxf(2, size * 0.09))
        "Erde":
            var n := 1 + variant
            for i in n:
                var off := (i - (n - 1) / 2.0) * size * 0.4
                var s := 1.0 if i == n / 2 else 0.65
                var pts := PackedVector2Array([c + Vector2(off - h * s, h * 0.7), c + Vector2(off, -h * s), c + Vector2(off + h * s, h * 0.7)])
                ci.draw_colored_polygon(pts, col)
            ci.draw_line(c + Vector2(-h, h * 0.7), c + Vector2(h, h * 0.7), col, maxf(2, size * 0.08))
        "Luft":
            for i in 2 + variant:
                var r := h * (1.0 - i * 0.28)
                ci.draw_arc(c + Vector2(i * size * 0.06, 0), r, PI * 0.2 + i * 0.4, PI * 1.5 + i * 0.4, 20, col, maxf(2, size * 0.09))


static func _flame(ci: CanvasItem, c: Vector2, h: float, col: Color) -> void:
    var w := h * 0.75
    var pts := PackedVector2Array([
        c + Vector2(0, -h), c + Vector2(w * 0.55, -h * 0.25), c + Vector2(w * 0.4, h * 0.45),
        c + Vector2(0, h), c + Vector2(-w * 0.4, h * 0.45), c + Vector2(-w * 0.55, -h * 0.25)])
    ci.draw_colored_polygon(pts, col)
    var inner := PackedVector2Array([
        c + Vector2(0, -h * 0.35), c + Vector2(w * 0.25, h * 0.35), c + Vector2(0, h * 0.75), c + Vector2(-w * 0.25, h * 0.35)])
    ci.draw_colored_polygon(inner, Color(1.0, 0.9, 0.5, 0.75))


## Dezenter Hintergrund: Farbverlauf und schräge Linien.
class Backdrop extends Control:
    func _draw() -> void:
        var sz := size
        draw_rect(Rect2(Vector2.ZERO, sz), Style.BG)
        var c := Vector2(sz.x * 0.5, sz.y * 0.35)
        for i in range(8, 0, -1):
            var r := sz.x * 0.09 * i
            draw_circle(c, r, Color(0.16, 0.18, 0.26, 0.05))
        for k in range(-20, 40):
            var x := k * 80.0
            draw_line(Vector2(x, 0), Vector2(x + sz.y * 0.6, sz.y), Color(1, 1, 1, 0.012), 1.0)