//! Tool Settings panel — shows all properties for the active tool.
//!
//! **Purpose:** Right-side panel showing tool-specific settings like the reference images.
//! - Brush: Size, Opacity, Hardness, Flow, Spacing
//! - Eraser: Size, Opacity, Hardness
//! - Vector: Fill, Stroke Width, Opacity, Radius/Points/Sides (shape-specific)
//! - Select: Feather, Anti-alias
//! - Magic Wand: Tolerance, Anti-alias, Contiguous
//! - Text: Font, Size, Angle, Color, Alignment, Orientation
//! - Gradient: Type, Opacity
//!
//! All controls emit real Messages wired to `app.rs` handlers; no `NoOp` remains.

use crate::app::{Message, ToolState};
use crate::panels::styles;
use crate::settings::AppSettings;
use crate::theme::ThemeColors;
use crate::widgets::plain_slider::plain_slider;
use hcie_engine_api::Tool;
use iced::widget::{button, checkbox, column, container, horizontal_rule, row, scrollable, text, text_input};
use iced::{Element, Length};

/// Build the tool settings panel for the active tool.
pub fn view<'a>(
    tool_state: &'a ToolState,
    settings: &'a AppSettings,
    fg_color: [u8; 4],
    text_draft: Option<&'a crate::app::TextDraft>,
    colors: ThemeColors,
) -> Element<'a, Message> {
    let content = match tool_state.active_tool {
        Tool::Brush | Tool::Eraser | Tool::Pen => brush_settings(tool_state, settings, colors),
        Tool::Spray => spray_settings(tool_state, settings, colors),
        Tool::VectorLine
        | Tool::VectorRect
        | Tool::VectorCircle
        | Tool::VectorArrow
        | Tool::VectorStar
        | Tool::VectorPolygon
        | Tool::VectorRhombus
        | Tool::VectorCylinder
        | Tool::VectorHeart
        | Tool::VectorBubble
        | Tool::VectorGear
        | Tool::VectorCross
        | Tool::VectorCrescent
        | Tool::VectorBolt
        | Tool::VectorArrow4 => vector_settings(tool_state, settings, colors),
        Tool::Select | Tool::Lasso | Tool::PolygonSelect => select_settings(settings, colors),
        Tool::MagicWand | Tool::SmartSelect => magic_wand_settings(settings, colors),
        Tool::Text => text_settings(settings, fg_color, text_draft, colors),
        Tool::Move => move_settings(settings, colors),
        Tool::Gradient => gradient_settings(settings, colors),
        Tool::FloodFill => flood_fill_settings(settings, colors),
        _ => column![text("No settings").size(11)].spacing(4),
    };

    let reset_btn = button(text("Reset to Defaults").size(10))
        .on_press(Message::ResetToolDefaults)
        .padding([4, 8])
        .width(Length::Fill);

    let panel = column![
        scrollable(content).height(Length::Fill),
        horizontal_rule(1),
        reset_btn,
    ]
    .spacing(2)
    .padding(4);

    container(panel)
        .width(Length::Fill)
        .height(Length::Fill)
        .style(move |_theme| styles::panel_background(colors))
        .into()
}

fn brush_settings(
    ts: &ToolState,
    settings: &AppSettings,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    column![
        section_header("Brush Settings", c),
        prop_slider(
            "Size",
            ts.brush_size,
            1.0,
            500.0,
            Message::BrushSizeChanged,
            c
        ),
        prop_slider(
            "Opacity",
            ts.brush_opacity * 100.0,
            0.0,
            100.0,
            |v| Message::BrushOpacityChanged(v / 100.0),
            c
        ),
        prop_slider(
            "Hardness",
            ts.brush_hardness * 100.0,
            0.0,
            100.0,
            |v| Message::BrushHardnessChanged(v / 100.0),
            c
        ),
        prop_slider(
            "Flow",
            ts2.brush_flow * 100.0,
            0.0,
            100.0,
            |v| Message::BrushFlowChanged(v / 100.0),
            c
        ),
        prop_slider(
            "Spacing",
            ts.brush_spacing * 100.0,
            1.0,
            100.0,
            |v| Message::BrushSpacingChanged(v / 100.0),
            c
        ),
        checkbox("Color Variant", ts.brush_color_variant)
            .on_toggle(Message::BrushColorVariantToggled)
            .size(11),
        prop_slider(
            "Variant Amount",
            ts.brush_variant_amount * 100.0,
            0.0,
            100.0,
            |v| Message::BrushVariantAmountChanged(v / 100.0),
            c
        ),
        checkbox("Cyclic Color", ts.brush_cyclic_color)
            .on_toggle(Message::BrushCyclicColorToggled)
            .size(11),
        prop_slider(
            "Cyclic Speed",
            ts.brush_cyclic_speed.clamp(0.01, 5.0),
            0.01,
            5.0,
            Message::BrushCyclicSpeedChanged,
            c
        ),
    ]
    .spacing(4)
}

fn spray_settings(
    ts: &ToolState,
    settings: &AppSettings,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    column![
        section_header("Spray Settings", c),
        prop_slider(
            "Size",
            ts.brush_size,
            1.0,
            500.0,
            Message::BrushSizeChanged,
            c
        ),
        prop_slider(
            "Particle Size",
            ts2.spray_particle_size,
            1.0,
            20.0,
            Message::SprayParticleSizeChanged,
            c
        ),
        prop_slider(
            "Density",
            ts2.spray_density as f32,
            10.0,
            1000.0,
            |v| Message::SprayDensityChanged(v as u32),
            c
        ),
        prop_slider(
            "Opacity",
            ts.brush_opacity * 100.0,
            0.0,
            100.0,
            |v| Message::BrushOpacityChanged(v / 100.0),
            c
        ),
        prop_slider(
            "Hardness",
            ts.brush_hardness * 100.0,
            0.0,
            100.0,
            |v| Message::BrushHardnessChanged(v / 100.0),
            c
        ),
        checkbox("Color Variant", ts.brush_color_variant)
            .on_toggle(Message::BrushColorVariantToggled)
            .size(11),
        prop_slider(
            "Variant Amount",
            ts.brush_variant_amount * 100.0,
            0.0,
            100.0,
            |v| Message::BrushVariantAmountChanged(v / 100.0),
            c
        ),
        checkbox("Cyclic Color", ts.brush_cyclic_color)
            .on_toggle(Message::BrushCyclicColorToggled)
            .size(11),
        prop_slider(
            "Cyclic Speed",
            ts.brush_cyclic_speed.clamp(0.01, 5.0),
            0.01,
            5.0,
            Message::BrushCyclicSpeedChanged,
            c
        ),
    ]
    .spacing(4)
}

fn vector_settings(
    ts: &ToolState,
    settings: &AppSettings,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    let mut col = column![
        section_header("Vector Settings", c),
        prop_slider(
            "Stroke Width",
            ts2.vector_stroke_width,
            0.0,
            50.0,
            Message::VectorStrokeChanged,
            c
        ),
        prop_slider(
            "Opacity",
            ts2.vector_opacity * 100.0,
            0.0,
            100.0,
            |v| Message::VectorOpacityChanged(v / 100.0),
            c
        ),
        iced::widget::checkbox("Fill", ts2.vector_fill)
            .on_toggle(Message::VectorFillToggled)
            .size(11),
    ]
    .spacing(4);

    // Shape-specific controls.
    match ts.active_tool {
        Tool::VectorRect => {
            col = col.push(prop_slider(
                "Corner Radius",
                ts2.vector_radius,
                0.0,
                100.0,
                Message::VectorRadiusChanged,
                c,
            ));
        }
        Tool::VectorStar => {
            col = col.push(prop_slider(
                "Points",
                ts2.vector_points as f32,
                3.0,
                20.0,
                |v| Message::VectorPointsChanged(v as u32),
                c,
            ));
        }
        Tool::VectorPolygon => {
            col = col.push(prop_slider(
                "Sides",
                ts2.vector_sides as f32,
                3.0,
                12.0,
                |v| Message::VectorSidesChanged(v as u32),
                c,
            ));
        }
        _ => {}
    }

    col
}

fn select_settings(
    settings: &AppSettings,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    column![
        section_header("Selection Settings", c),
        prop_slider(
            "Feather",
            ts2.select_feather,
            0.0,
            250.0,
            Message::SelectionFeatherChanged,
            c
        ),
        iced::widget::checkbox("Anti-alias", ts2.selection_anti_alias)
            .on_toggle(Message::SelectionAntiAliasToggled)
            .size(11),
    ]
    .spacing(4)
}

fn magic_wand_settings(
    settings: &AppSettings,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    column![
        section_header("Magic Wand Settings", c),
        prop_slider(
            "Tolerance",
            ts2.magic_wand_tolerance,
            0.0,
            255.0,
            |v| Message::SelectionToleranceChanged(v as u8),
            c
        ),
        iced::widget::checkbox("Contiguous", ts2.selection_contiguous)
            .on_toggle(Message::SelectionContiguousToggled)
            .size(11),
        iced::widget::checkbox("Anti-alias", ts2.selection_anti_alias)
            .on_toggle(Message::SelectionAntiAliasToggled)
            .size(11),
    ]
    .spacing(4)
}

fn text_settings(
    settings: &AppSettings,
    fg_color: [u8; 4],
    text_draft: Option<&crate::app::TextDraft>,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    let draft_font = text_draft
        .map(|d| d.font.clone())
        .unwrap_or_else(|| ts2.text_font.clone());
    let draft_size = text_draft.map(|d| d.size).unwrap_or(ts2.text_size);
    let draft_angle = text_draft.map(|d| d.angle).unwrap_or(ts2.text_angle);
    let draft_color = text_draft.map(|d| d.color).unwrap_or(fg_color);
    let draft_content = text_draft.map(|d| d.content.clone()).unwrap_or_default();
    let _alignment = text_draft
        .map(|d| format!("{:?}", d.alignment))
        .unwrap_or_else(|| "Left".to_string());
    let _orientation = text_draft
        .map(|d| format!("{:?}", d.orientation))
        .unwrap_or_else(|| "Horizontal".to_string());

    column![
        section_header("Text Settings", c),
        row![
            text("Font:").size(10).width(Length::Fixed(50.0)),
            text_input("Font", &draft_font)
                .on_input(Message::TextFontChanged)
                .size(10)
                .width(Length::Fill),
        ]
        .spacing(4)
        .align_y(iced::Alignment::Center),
        prop_slider("Size", draft_size, 4.0, 200.0, Message::TextSizeChanged, c),
        prop_slider(
            "Angle",
            draft_angle,
            -180.0,
            180.0,
            Message::TextAngleChanged,
            c
        ),
        color_row("Color:", draft_color, c),
        row![
            text("Content:").size(10).width(Length::Fixed(50.0)),
            text_input("Text", &draft_content)
                .on_input(Message::TextContentChanged)
                .size(10)
                .width(Length::Fill),
        ]
        .spacing(4)
        .align_y(iced::Alignment::Center),
        row![
            text("Align:").size(10).width(Length::Fixed(50.0)),
            button(text("Left").size(9))
                .on_press(Message::TextAlignChanged("Left".to_string()))
                .padding([2, 4]),
            button(text("Center").size(9))
                .on_press(Message::TextAlignChanged("Center".to_string()))
                .padding([2, 4]),
            button(text("Right").size(9))
                .on_press(Message::TextAlignChanged("Right".to_string()))
                .padding([2, 4]),
        ]
        .spacing(3),
        row![
            text("Orient:").size(10).width(Length::Fixed(50.0)),
            button(text("H").size(9))
                .on_press(Message::TextOrientationChanged("Horizontal".to_string()))
                .padding([2, 6]),
            button(text("V").size(9))
                .on_press(Message::TextOrientationChanged("Vertical".to_string()))
                .padding([2, 6]),
        ]
        .spacing(3),
        row![
            button(text("Commit").size(10))
                .on_press(Message::TextCommit)
                .padding([4, 10]),
            button(text("Cancel").size(10))
                .on_press(Message::TextCancel)
                .padding([4, 10]),
        ]
        .spacing(6),
    ]
    .spacing(4)
}

fn move_settings(settings: &AppSettings, c: ThemeColors) -> iced::widget::Column<'static, Message> {
    let _ = settings;
    column![
        section_header("Move Settings", c),
        iced::widget::checkbox("Apply to New Layer", true)
            .on_toggle(Message::ToolApplyToNewLayerToggled)
            .size(11),
    ]
    .spacing(4)
}

fn gradient_settings(
    settings: &AppSettings,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    let gtype = ts2.gradient_type;
    column![
        section_header("Gradient Settings", c),
        row![
            text("Type:").size(10).width(Length::Fixed(40.0)),
            button(text("Linear").size(9))
                .on_press(Message::GradientTypeChanged(0))
                .padding([2, 6]),
            button(text("Radial").size(9))
                .on_press(Message::GradientTypeChanged(1))
                .padding([2, 6]),
        ]
        .spacing(3),
        prop_slider(
            "Opacity",
            ts2.gradient_opacity * 100.0,
            0.0,
            100.0,
            |v| Message::BrushOpacityChanged(v / 100.0),
            c
        ),
        text(if gtype == 1 { "Radial" } else { "Linear" }).size(9),
    ]
    .spacing(4)
}

fn flood_fill_settings(
    settings: &AppSettings,
    c: ThemeColors,
) -> iced::widget::Column<'static, Message> {
    let ts2 = settings.tool_settings.clone();
    column![
        section_header("Flood Fill Settings", c),
        prop_slider(
            "Tolerance",
            ts2.flood_fill_tolerance,
            0.0,
            255.0,
            |v| Message::SelectionToleranceChanged(v as u8),
            c
        ),
        iced::widget::checkbox("Contiguous", ts2.selection_contiguous)
            .on_toggle(Message::SelectionContiguousToggled)
            .size(11),
    ]
    .spacing(4)
}

fn section_header(label: &str, _c: ThemeColors) -> Element<'static, Message> {
    let l = label.to_string();
    row![text(l).size(11)].spacing(4).into()
}

fn prop_slider<F>(
    label: &str,
    value: f32,
    min: f32,
    max: f32,
    msg_fn: F,
    colors: ThemeColors,
) -> Element<'static, Message>
where
    F: Fn(f32) -> Message + 'static,
{
    plain_slider(label, value, min..=max, 0.1, "", 1, colors, msg_fn)
}

fn color_row(label: &str, color: [u8; 4], _c: ThemeColors) -> Element<'static, Message> {
    let l = label.to_string();
    let swatch = container(text(""))
        .width(14)
        .height(14)
        .style(move |_theme| iced::widget::container::Style {
            background: Some(iced::Background::Color(iced::Color::from_rgba(
                color[0] as f32 / 255.0,
                color[1] as f32 / 255.0,
                color[2] as f32 / 255.0,
                color[3] as f32 / 255.0,
            ))),
            border: iced::Border::default()
                .rounded(2)
                .color(iced::Color::from_rgb(0.3, 0.3, 0.3))
                .width(1),
            ..Default::default()
        });

    row![text(l).size(10).width(Length::Fixed(50.0)), swatch,]
        .spacing(4)
        .align_y(iced::Alignment::Center)
        .into()
}