// 基础输入件：单行输入（含占位文本）、搜索框、开关、分段控件、复选框。
// 一律自绘（Metro 需要方角 + accent 高亮）。占位文本手绘：内置 TextInput 没有
// placeholder-text（那是 std-widgets 的 LineEdit，外观不可控）。
import { Theme } from "../theme/tokens.slint";
import { Metrics } from "../theme/metrics.slint";
import { AppIcon, IconKind } from "../components/icons.slint";
import { UiText, TextRole } from "../components/label.slint";

/// 单行输入：内置 TextInput + 占位文本层（Focus 态由外部读 `focused`）。
export component PlainInput inherits Rectangle {
    in-out property <string> text: "";
    in property <string> placeholder: "";
    in property <color> text-color: Theme.fg-primary;
    in property <length> text-padding: 0px;
    out property <bool> focused: input.has-focus;
    callback edited(string);
    callback accepted(string);

    background: transparent;

    input := TextInput {
        x: root.text-padding;
        y: 0;
        width: root.width - 2 * root.text-padding;
        height: root.height;
        color: root.text-color;
        font-family: Theme.font-family;
        font-size: Theme.font-size-body;
        vertical-alignment: center;
        single-line: true;
        text <=> root.text;
        edited => { root.edited(self.text); }
        accepted => { root.accepted(self.text); }
    }

    if root.text == "" && root.placeholder != "" : UiText {
        x: root.text-padding;
        y: 0;
        width: root.width - 2 * root.text-padding;
        height: root.height;
        role: TextRole.body;
        text: root.placeholder;
        color: Theme.fg-disabled;
    }
}

export component SearchField inherits Rectangle {
    in-out property <string> text: "";
    in property <string> placeholder: "搜索";
    callback edited(string);
    callback accepted(string);

    height: Metrics.control-height;
    background: Theme.bg-input;
    border-radius: Metrics.radius-sm;
    border-width: 1px;
    border-color: field.focused ? Theme.accent : Theme.stroke;

    HorizontalLayout {
        padding-left: Metrics.gap-2;
        padding-right: Metrics.gap-2;
        spacing: Metrics.gap-2;

        AppIcon { kind: IconKind.search; icon-size: 14px; }

        field := PlainInput {
            placeholder: root.placeholder;
            text <=> root.text;
            edited(t) => { root.edited(t); }
            accepted(t) => { root.accepted(t); }
        }
    }
}

export component TextField inherits Rectangle {
    in-out property <string> text: "";
    in property <string> placeholder: "";
    callback edited(string);

    height: Metrics.control-height;
    background: Theme.bg-input;
    border-radius: Metrics.radius-sm;
    border-width: 1px;
    border-color: field.focused ? Theme.accent : Theme.stroke;

    field := PlainInput {
        text-padding: Metrics.gap-2;
        placeholder: root.placeholder;
        text <=> root.text;
        edited(t) => { root.edited(t); }
    }
}

export component ToggleSwitch inherits Rectangle {
    in-out property <bool> checked: false;
    callback toggled(bool);

    width: 40px;
    height: 20px;
    border-radius: 10px;
    background: checked ? Theme.accent : Theme.stroke-strong;
    animate background { duration: Theme.motion-normal; }

    Rectangle {
        width: 14px;
        height: 14px;
        y: 3px;
        x: root.checked ? root.width - self.width - 3px : 3px;
        border-radius: 7px;
        background: Theme.fg-on-accent;
        animate x { duration: Theme.motion-normal; easing: ease-in-out; }
    }

    TouchArea {
        mouse-cursor: pointer;
        clicked => {
            root.checked = !root.checked;
            root.toggled(root.checked);
        }
    }
}

/// 分段控件（视图切换、磁贴尺寸、主题三态共用）
export component SegmentedControl inherits Rectangle {
    in property <[string]> options;
    in-out property <int> selected: 0;
    callback changed(int);

    height: Metrics.control-height;
    background: Theme.bg-canvas;
    border-radius: Metrics.radius-sm;
    border-width: 1px;
    border-color: Theme.stroke;

    HorizontalLayout {
        padding: 2px;
        spacing: 2px;
        for o[i] in options : Rectangle {
            border-radius: Metrics.radius-sm;
            background: i == root.selected
                ? Theme.accent
                : (seg.has-hover ? Theme.bg-hover : transparent);
            animate background { duration: Theme.motion-fast; }

            UiText {
                role: TextRole.caption;
                text: o;
                horizontal-alignment: center;
                color: i == root.selected ? Theme.fg-on-accent : Theme.fg-primary;
            }

            seg := TouchArea {
                mouse-cursor: pointer;
                clicked => {
                    root.selected = i;
                    root.changed(i);
                }
            }
        }
    }
}

export component CheckBox inherits Rectangle {    in-out property <bool> checked: false;
    in property <string> text: "";
    callback toggled(bool);

    height: Metrics.touch-target;
    background: transparent;

    HorizontalLayout {
        spacing: Metrics.gap-2;

        Rectangle {
            width: 16px;
            height: 16px;
            border-radius: Metrics.radius-sm;
            border-width: 1px;
            border-color: root.checked ? Theme.accent : Theme.stroke-strong;
            background: root.checked ? Theme.accent : Theme.bg-input;

            if root.checked : AppIcon {
                kind: IconKind.check;
                icon-size: 12px;
                x: 2px;
                y: 2px;
                tint: Theme.fg-on-accent;
            }
        }

        UiText { role: TextRole.body; text: root.text; }

        TouchArea {
            mouse-cursor: pointer;
            clicked => {
                root.checked = !root.checked;
                root.toggled(root.checked);
            }
        }
    }
}

/// 滑条（09 §102/§101 的「强度滑条」：暗化层强度、面板半透明度共用）。
/// 自绘而非 std-widgets 的 Slider：Metro 需要方头轨道 + accent 填充，且要跟主题令牌一起换肤。
export component MetroSlider inherits Rectangle {
    in property <float> minimum: 0.0;
    in property <float> maximum: 1.0;
    in-out property <float> value: 1.0;
    callback changed(float);

    out property <float> ratio: root.maximum > root.minimum
        ? Math.max(0.0, Math.min(1.0, (root.value - root.minimum) / (root.maximum - root.minimum)))
        : 0.0;

    width: 200px;
    height: Metrics.touch-target;
    background: transparent;

    /// 鼠标位置 → 取值（Slint 的 function 不能声明局部变量，所以拆成纯函数；
    /// 函数名不用 kebab-case：`value-at(...)` 会被当成减法解析）
    pure function valueForX(x: length) -> float {
        return root.minimum
            + Math.max(0.0, Math.min(1.0, x / root.width)) * (root.maximum - root.minimum);
    }

    // 轨道 + 已填充段
    Rectangle {
        x: 0;
        y: (root.height - 4px) / 2;
        width: root.width;
        height: 4px;
        border-radius: 2px;
        background: Theme.stroke-strong;
    }
    Rectangle {
        x: 0;
        y: (root.height - 4px) / 2;
        width: root.width * root.ratio;
        height: 4px;
        border-radius: 2px;
        background: Theme.accent;
    }
    // 滑块
    Rectangle {
        x: (root.width - 14px) * root.ratio;
        y: (root.height - 14px) / 2;
        width: 14px;
        height: 14px;
        border-radius: 7px;
        background: Theme.accent;
        border-width: 2px;
        border-color: Theme.surface-solid;
    }

    area := TouchArea {
        mouse-cursor: pointer;
        moved => {
            root.value = root.valueForX(self.mouse-x);
            root.changed(root.value);
        }
        clicked => {
            root.value = root.valueForX(self.mouse-x);
            root.changed(root.value);
        }
    }

    accessible-role: slider;
}

/// 预设色板（09 §104 自定义强调色：预设色板 + 取色器，取色器由十六进制输入承担）。
export component ColorSwatches inherits Rectangle {
    in property <[color]> palette;
    in property <color> current;
    /// 传**索引**而不是 color：Slint 没有「颜色 → #RRGGBB」的格式化，
    /// 预设色板的十六进制串由 Rust 侧同一张表给出（一处真相）。
    callback picked(int);

    width: root.palette.length * 28px;
    height: 28px;
    background: transparent;

    HorizontalLayout {
        spacing: 4px;

        for shade[i] in root.palette : Rectangle {
            width: 24px;
            height: 24px;
            border-radius: Metrics.radius-sm;
            background: shade;
            border-width: shade == root.current ? 2px : 1px;
            border-color: shade == root.current ? Theme.fg-primary : Theme.stroke;

            swatch-touch := TouchArea {
                mouse-cursor: pointer;
                clicked => { root.picked(i); }
            }

            accessible-role: button;
        }
    }
}