// LR MIX surface layout (splash).
//
// This file is DATA: it describes how the mixing surface looks — which
// widgets each strip shows and how they are arranged. Anyone (or any
// model) can write a different surface by editing/replacing this file and
// starting the app with --layout=<name>; the Rust host rebinds by widget name.
//
// == The palette ==
// A Splash body runs in its own isolate VM, which registers a FRESH stock
// `mod.theme` and never sees the app's retint — so the host PREPENDS one line
// binding `mp` to the desktop palette (src/theme.rs) before handing this file
// to the Splash. A script error therefore reports this file's line + 1.
// The keys, all `#rrggbb`:
//
//   mp.bg          strip fill                mp.accent   selection, gain
//   mp.bg_dark     gutter and inset panels   mp.red      mute lit, meter hot
//   mp.bg_light    idle control fill         mp.green    meter low
//   mp.fg          readouts                  mp.yellow   EQ, meter mid
//   mp.fg_bright   the value that matters    mp.cyan     dynamics, pan
//   mp.fg_dim      labels, scales
//   mp.muted       1px borders, tracks, ticks
//
// The look is Omarchy: flat fills, square corners, one 1px border per state,
// no bevels and no gradients. Colours belong to the theme — a layout that
// wants a new one asks for a palette key, not a literal.
//
// == The slot contract ==
// The host looks for strip slots named strip_0 .. strip_15 and binds the
// mixer's own strip list (derived from the console's stereo-link state) to
// them in order, hiding unused slots. Inside a slot, ALL of these child
// names are OPTIONAL — a layout may show any subset:
//
//   eq        SolidView whose shader reads instances:
//               eq_on, b1..b6 = vec4(type, freq01, gain01, q01),
//               sel_f = freq01 of the band the eq slider drives.
//               Clicking it picks the nearest band.
//   eq_lbl   / eq_sl     EQ gain of the selected band (every strip), the
//                         slider that bends the curve above it
//   gain_lbl / gain_sl   preamp gain readout + slider (input strips only;
//                         the host hides the row on bus/main strips)
//   dyn       SolidView with instances: comp_on, thr_db, ratio, gate_on,
//               gate_thr_db, gr_db (live gain reduction, dB <= 0)
//   pan_lbl / pan_sl     pan readout + slider
//   fader_db  Label — the fader value in dB
//   fader     Slider (min 0, max 1) — the wire float, four-segment taper
//   meter     SolidView with instances: level_db, peak_db (-90..0)
//   strip_lbl Label — "Ch 1" / "Bus 5" / "Main 1"
//   mute      clickable SolidView with instance: muted; child text "MUTE"
//   name_plate clickable SolidView with instances: plate_rgb (vec3),
//               plate_filled; child name_lbl Label
//   surface_note (top level) Label the host uses for status text
//
// Sliders carry the raw wire value 0..1; every dB conversion lives host-side.
// SAFETY: a layout can only NAME these visual slots. It cannot express OSC
// addresses — the host's closed whitelist (safety.rs) is the only place
// wire addresses exist, and its deny-list gate sits at the socket either way.

let ValueLabel = Label{
    width: Fill
    height: 13
    flow: Right
    align: Align{x: 0.5}
    text: "—"
    draw_text.color: mp.fg
    draw_text.text_style: theme.font_code{font_size: 8.0}
}

let RowSlider = Slider{
    width: Fill
    height: 13
    min: 0.0
    max: 1.0
    step: 0.0
    text: ""
    text_input: TextInput{width: 0, height: 0}
    draw_bg +: {
        track: uniform(mp.muted)
        fill: uniform(mp.accent)
        knob: uniform(mp.fg_bright)
        pixel: fn() {
            let sdf = Sdf2d.viewport(self.pos * self.rect_size)
            let cy = self.rect_size.y * 0.5
            let x0 = 4.0
            let x1 = self.rect_size.x - 4.0
            sdf.rect(x0, cy - 1.0, x1 - x0, 2.0)
            sdf.fill(self.track)
            let px = x0 + (x1 - x0) * self.slide_pos
            sdf.rect(x0, cy - 1.0, max(px - x0, 1.0), 2.0)
            sdf.fill(self.fill)
            // A square tab, not a bead: the position is a value, and a flat
            // edge is easier to read one against the next.
            sdf.rect(px - 1.5, cy - 4.5, 3.0, 9.0)
            sdf.fill(self.knob)
            return sdf.result
        }
    }
}

let EqSlider = RowSlider{
    draw_bg +: {
        fill: uniform(mp.yellow)
        detent: uniform(mp.fg_dim)
        pixel: fn() {
            let sdf = Sdf2d.viewport(self.pos * self.rect_size)
            let cy = self.rect_size.y * 0.5
            let x0 = 4.0
            let x1 = self.rect_size.x - 4.0
            sdf.rect(x0, cy - 1.0, x1 - x0, 2.0)
            sdf.fill(self.track)
            // fill grows out of the centre: this slider is a +/- 15 dB cut/boost
            let mid = (x0 + x1) * 0.5
            let px = x0 + (x1 - x0) * self.slide_pos
            sdf.rect(min(px, mid), cy - 1.0, max(abs(px - mid), 1.0), 2.0)
            sdf.fill(self.fill)
            sdf.rect(mid - 0.5, cy - 3.5, 1.0, 7.0)
            sdf.fill(self.detent)
            sdf.rect(px - 1.5, cy - 4.5, 3.0, 9.0)
            sdf.fill(self.knob)
            return sdf.result
        }
    }
}

let PanSlider = RowSlider{
    draw_bg +: {
        fill: uniform(mp.cyan)
    }
}

let EqCurve = SolidView{
    width: Fill
    height: 38
    cursor: MouseCursor.Hand
    draw_bg +: {
        c_panel: uniform(mp.bg_dark)
        c_zero: uniform(mp.muted)
        c_ink: uniform(mp.yellow)
        c_ink_off: uniform(mp.fg_dim)
        c_sel: uniform(mp.accent)
        c_dot: uniform(mp.fg_bright)
        eq_on: instance(1.0)
        b1: instance(vec4(2.0, 0.15, 0.5, 0.5))
        b2: instance(vec4(2.0, 0.40, 0.5, 0.5))
        b3: instance(vec4(2.0, 0.65, 0.5, 0.5))
        b4: instance(vec4(2.0, 0.88, 0.5, 0.5))
        b5: instance(vec4(2.0, 0.94, 0.5, 0.5))
        b6: instance(vec4(2.0, 0.98, 0.5, 0.5))
        sel_f: instance(0.40)
        band_db: fn(b: vec4, x: float) -> float {
            let gd = (b.z - 0.5) * 30.0
            let sig = 0.035 + 0.24 * b.w
            let d = x - b.y
            let bell = gd * exp(-(d * d) / (2.0 * sig * sig))
            let lsh = gd * (1.0 - smoothstep(b.y - 0.14, b.y + 0.14, x))
            let hsh = gd * smoothstep(b.y - 0.14, b.y + 0.14, x)
            let lcut = -90.0 * max(b.y - x, 0.0)
            let hcut = -90.0 * max(x - b.y, 0.0)
            if b.x < 0.5 { return lcut }
            if b.x < 1.5 { return lsh }
            if b.x < 3.5 { return bell }
            if b.x < 4.5 { return hsh }
            return hcut
        }
        pixel: fn() {
            let x = self.pos.x
            var db = self.band_db(self.b1, x) + self.band_db(self.b2, x)
                + self.band_db(self.b3, x) + self.band_db(self.b4, x)
                + self.band_db(self.b5, x) + self.band_db(self.b6, x)
            db = clamp(db, -16.0, 16.0)
            let h = self.rect_size.y
            let w = self.rect_size.x
            let y = h * 0.5 - db * (h / 36.0)
            let py = self.pos.y * h
            let curve = 1.0 - smoothstep(0.8, 1.9, abs(py - y))
            let center = 1.0 - smoothstep(0.2, 0.9, abs(py - h * 0.5))
            // A flat inset panel, a muted zero line, and the curve — dimmed to
            // the quiet foreground while the console reports EQ off, so an
            // unknown state never reads as a confident flat response.
            let ink = self.c_ink_off.mix(self.c_ink, self.eq_on)
            var col = self.c_panel.mix(self.c_zero, center).mix(ink, curve)
            // The band the gain slider drives: a dim accent hairline plus a
            // bright dot where it meets the curve.
            let dx = abs(x - self.sel_f) * w
            col = col.mix(self.c_sel, 0.4 * (1.0 - smoothstep(0.4, 1.3, dx)))
            let hit = 1.0 - smoothstep(1.6, 2.9, length(vec2(dx, py - y)))
            col = col.mix(self.c_dot, hit)
            return col
        }
    }
}

let DynCurve = SolidView{
    width: Fill
    height: 32
    draw_bg +: {
        c_panel: uniform(mp.bg_dark)
        c_ink: uniform(mp.cyan)
        c_gate: uniform(mp.cyan)
        c_gr: uniform(mp.red)
        comp_on: instance(0.0)
        thr_db: instance(0.0)
        ratio: instance(1.0)
        gate_on: instance(0.0)
        gate_thr_db: instance(-80.0)
        gr_db: instance(0.0)
        pixel: fn() {
            let h = self.rect_size.y
            let w = self.rect_size.x
            let in_db = -60.0 + 60.0 * self.pos.x
            var out_db = in_db
            if self.comp_on > 0.5 {
                if in_db > self.thr_db {
                    out_db = self.thr_db + (in_db - self.thr_db) / max(self.ratio, 1.0)
                }
            }
            let y = h * (-out_db / 60.0)
            let py = self.pos.y * h
            let curve = 1.0 - smoothstep(0.8, 1.9, abs(py - y))
            var col = self.c_panel.mix(self.c_ink, curve)
            // gate region: a flat wash below the gate threshold
            if self.gate_on > 0.5 {
                let gx = (self.gate_thr_db + 60.0) / 60.0
                if self.pos.x < gx && py > y {
                    col = col.mix(self.c_gate, 0.22)
                }
            }
            // live gain reduction: a bar dropping from the top right
            let grn = clamp(-self.gr_db / 20.0, 0.0, 1.0)
            if self.pos.x > 1.0 - 3.5 / w && self.pos.y < grn {
                col = self.c_gr
            }
            return col
        }
    }
}

let MeterBar = SolidView{
    width: Fill{weight: 14.0}
    height: Fill
    draw_bg +: {
        gutter: uniform(mp.bg)
        trough: uniform(mp.bg_dark)
        low: uniform(mp.green)
        mid: uniform(mp.yellow)
        hot: uniform(mp.red)
        tick: uniform(mp.fg_bright)
        level_db: instance(-90.0)
        peak_db: instance(-90.0)
        pixel: fn() {
            let h = self.rect_size.y
            let w = self.rect_size.x
            let norm = clamp((self.level_db + 60.0) / 60.0, 0.0, 1.0)
            let peakn = clamp((self.peak_db + 60.0) / 60.0, 0.0, 1.0)
            let frac = 1.0 - self.pos.y
            // The ladder: green, into yellow from about -18 dB, into red over
            // the last three. Unlit, the red zone stays visible as a dim cap.
            let ladder = self.low.mix(self.mid, smoothstep(0.70, 0.88, frac))
                .mix(self.hot, smoothstep(0.88, 0.97, frac))
            // segment shading so the bar reads "LED-ish"
            let seg = 0.88 + 0.12 * smoothstep(0.35, 0.5, abs(fract(frac * 30.0) - 0.5))
            var col = self.trough.mix(self.hot, 0.16 * step(0.955, frac))
            if frac < norm {
                col = self.trough.mix(ladder, seg)
            }
            // peak-hold tick
            if abs(frac - peakn) < 1.5 / h && peakn > 0.01 {
                col = self.tick
            }
            let x = self.pos.x * w
            if x < 1.0 || x > w - 1.0 {
                col = self.gutter
            }
            return col
        }
    }
}

let FaderSlider = Slider{
    axis: Vertical
    width: Fill{weight: 46.0}
    height: Fill
    min: 0.0
    max: 1.0
    step: 0.0
    text: ""
    text_input: TextInput{width: 0, height: 0}
    draw_bg +: {
        body: uniform(mp.bg_dark)
        slot: uniform(mp.muted)
        tick: uniform(mp.muted)
        cap: uniform(mp.fg_dim)
        cap_edge: uniform(mp.accent)
        cap_line: uniform(mp.fg_bright)
        pixel: fn() {
            let sdf = Sdf2d.viewport(self.pos * self.rect_size)
            let h = self.rect_size.y
            let w = self.rect_size.x
            sdf.rect(0.0, 0.0, w, h)
            sdf.fill(self.body)
            // tick marks every 1/8 of travel (the taper puts the printed
            // dB scale exactly on these lines)
            let rel = self.pos.y
            let grid = abs(fract(rel * 8.0 + 0.5) - 0.5) * (h / 8.0)
            let mark = 1.0 - smoothstep(0.4, 0.9, grid)
            let px = self.pos.x * w
            if px < 6.0 {
                sdf.rect(0.0, rel * h - 0.5, 5.0, 1.0)
                sdf.fill(self.tick * mark)
            }
            // centre slot
            sdf.rect(w * 0.5 - 1.0, 3.0, 2.0, h - 6.0)
            sdf.fill(self.slot)
            // handle: a flat square cap, edged in the accent, with the
            // pointer line across it
            let cap_h = 22.0
            let cy = (1.0 - self.slide_pos) * (h - cap_h)
            sdf.rect(3.5, cy + 0.5, w - 7.0, cap_h - 1.0)
            sdf.fill_keep(self.cap)
            sdf.stroke(self.cap_edge, 1.0)
            sdf.rect(3.0, cy + cap_h * 0.5 - 1.0, w - 6.0, 2.0)
            sdf.fill(self.cap_line)
            return sdf.result
        }
    }
}

let ScaleMark = Label{
    width: Fill
    height: Fill
    flow: Right
    align: Align{x: 1.0}
    draw_text.color: mp.fg_dim
    draw_text.text_style: theme.font_code{font_size: 7.0}
    text: ""
}

let ScaleCol = View{
    width: Fill{weight: 26.0}
    height: Fill
    flow: Down
    ScaleMark{text: "10"}
    ScaleMark{text: "5"}
    ScaleMark{text: "0" draw_text.color: mp.fg}
    ScaleMark{text: "-5"}
    ScaleMark{text: "-10"}
    ScaleMark{text: "-20"}
    ScaleMark{text: "-30"}
    ScaleMark{text: "-50"}
}

let MutePlate = SolidView{
    width: Fill
    height: 21
    cursor: MouseCursor.Hand
    new_batch: true
    align: Align{x: 0.5, y: 0.5}
    draw_bg +: {
        idle: uniform(mp.bg_light)
        idle_edge: uniform(mp.muted)
        lit: uniform(mp.red)
        deep: uniform(mp.bg_dark)
        muted: instance(0.0)
        pixel: fn() {
            let sdf = Sdf2d.viewport(self.pos * self.rect_size)
            sdf.rect(0.5, 0.5, self.rect_size.x - 1.0, self.rect_size.y - 1.0)
            // Lit is red laid over the deepest background: a red plate that
            // still carries its own word, edged in the full-strength hue.
            let fill = self.idle.mix(self.lit.mix(self.deep, 0.5), self.muted)
            // fill_keep, not fill: `fill` clears the shape, so a stroke after
            // it draws nothing at all.
            sdf.fill_keep(fill)
            sdf.stroke(self.idle_edge.mix(self.lit, self.muted), 1.0)
            return sdf.result
        }
    }
    Label{
        text: "MUTE"
        draw_text.color: mp.fg_bright
        draw_text.text_style: theme.font_code{font_size: 7.0}
    }
}

let NamePlate = SolidView{
    width: Fill
    height: 23
    cursor: MouseCursor.Hand
    new_batch: true
    align: Align{x: 0.5, y: 0.5}
    draw_bg +: {
        idle: uniform(mp.bg_light)
        // The console's scribble colour, until it reports one. The default is
        // the muted key — nothing on this surface is a neutral grey.
        plate_rgb: instance(vec3(0.254, 0.282, 0.408))
        plate_filled: instance(0.0)
        pixel: fn() {
            let sdf = Sdf2d.viewport(self.pos * self.rect_size)
            sdf.rect(0.5, 0.5, self.rect_size.x - 1.0, self.rect_size.y - 1.0)
            sdf.fill_keep(self.idle.mix(vec4(self.plate_rgb, 1.0), self.plate_filled))
            sdf.stroke(vec4(self.plate_rgb, 1.0), 1.0)
            return sdf.result
        }
    }
    name_lbl := Label{
        flow: Right
        text: "—"
        draw_text.color: mp.fg
        draw_text.text_style: theme.font_code{font_size: 7.5}
    }
}

let Strip = View{
    width: Fill
    height: Fill
    flow: Down
    spacing: 2
    padding: Inset{top: 3, bottom: 3, left: 2, right: 2}
    show_bg: true
    new_batch: true
    draw_bg +: {
        fill: uniform(mp.bg)
        edge: uniform(mp.muted)
        pixel: fn() {
            let sdf = Sdf2d.viewport(self.pos * self.rect_size)
            sdf.rect(0.0, 0.0, self.rect_size.x, self.rect_size.y)
            sdf.fill(self.fill)
            sdf.rect(self.rect_size.x - 1.0, 0.0, 1.0, self.rect_size.y)
            sdf.fill(self.edge)
            return sdf.result
        }
    }

    eq := EqCurve{}
    eq_row := View{
        width: Fill height: 41 flow: Down
        eq_lbl := ValueLabel{}
        eq_sl := EqSlider{}
    }
    gain_slot := View{
        width: Fill height: 41 flow: Down
        gain_row := View{
            width: Fill height: 41 flow: Down
            gain_lbl := ValueLabel{}
            gain_sl := RowSlider{}
        }
    }
    dyn := DynCurve{}
    pan_row := View{
        width: Fill height: 41 flow: Down
        pan_lbl := ValueLabel{}
        pan_sl := PanSlider{}
    }
    fader_db := Label{
        width: Fill
        height: 15
        flow: Right
        align: Align{x: 0.5}
        text: "—"
        draw_text.color: mp.fg_bright
        draw_text.text_style: theme.font_code{font_size: 9.0}
    }
    fader_block := View{
        width: Fill
        height: Fill
        flow: Right
        spacing: 2
        align: Align{x: 0.5}
        scale := ScaleCol{}
        fader := FaderSlider{}
        meter := MeterBar{}
    }
    strip_lbl := Label{
        width: Fill
        height: 12
        flow: Right
        align: Align{x: 0.5}
        text: ""
        draw_text.color: mp.fg_dim
        draw_text.text_style: theme.font_code{font_size: 7.5}
    }
    mute := MutePlate{}
    name_plate := NamePlate{}
}

View{
    width: Fill
    height: Fill
    flow: Down
    show_bg: true
    new_batch: true
    draw_bg.color: mp.bg_dark

    surface_note := Label{
        visible: false
        width: Fill
        height: Fit
        align: Align{x: 0.5}
        text: ""
        draw_text.color: mp.fg_dim
        draw_text.text_style: theme.font_code{font_size: 8.0}
    }
    strip_row := View{
        width: Fill
        height: Fill
        flow: Right
        spacing: 0
        strip_0 := Strip{}
        strip_1 := Strip{}
        strip_2 := Strip{}
        strip_3 := Strip{}
        strip_4 := Strip{}
        strip_5 := Strip{}
        strip_6 := Strip{}
        strip_7 := Strip{}
        strip_8 := Strip{}
        strip_9 := Strip{}
        strip_10 := Strip{}
        strip_11 := Strip{}
        strip_12 := Strip{}
        strip_13 := Strip{}
        strip_14 := Strip{}
        strip_15 := Strip{}
    }
}