// BULL TERMINAL — the green-on-black trading floor. A random-walk OHLC
// tape commits ONE candle per beat (beats detected from the phase wrap —
// no wiring needed), the live candle ticks every frame with volatility
// that spikes on the beat envelope, and the whole terminal is mono
// phosphor: bright green up-candles, dim green down-candles, scanlines,
// a glowing crosshair riding the live price. NO text — the effect stack
// has no glyph path, so the axis is dash ticks, which is the terminal
// anyway. Pattern taught: per_beat is the tape clock; drift > 0 = bull.
{
    name: "Bull Terminal"
    engine: "stockcharts"
    seed: 21

    candles: 110
    per_beat: 1
    vol: 1.1
    drift: 0.15
    spike: 1.6
    ma: 14
    grid_x: 4
    grid_y: 7
    scan: 16
    width: 15
    height: 7.5

    beat_pulse: 0.5
    p0: 0.15                     // phosphor gain
    p1: "0.3 + 0.7*pulse"        // crosshair pumps on the beat

    // PERFORMANCE DIALS — the chart engine's own p-levers: GAIN drives
    // the phosphor, XHAIR holds the crosshair pump when touched, PANIC
    // floods the board red.
    dials: [
        {name: "GAIN", bind: "p0", default: 0.15},
        {name: "XHAIR", bind: "p1", default: 0.5},
        {name: "PANIC", bind: "p2", default: 0.0}
    ]

    color_bg: #x020604
    color_a: #x39ff6a
    color_b: #x117a34
    color_c: #xd8ffe4

    cam_orbit: 0.0
    cam_fov: 40
    fog: 0.0
    glow: 1.2

    stages: [
        {kind: "bloom", threshold: 0.4, strength: 1.3, levels: 2}
    ]

    // THE LOOK LIVES HERE. This block is not a reference to the
    // engine's shader — it IS the pixel math this effect runs.
    // Rewrite it and the effect looks different; everything else
    // (geometry, motion, the content coupling, the beat) keeps
    // working, because the block SUBCLASSES the engine shader.
    // Inputs: t = candle age 0..1, attr = (element class, age, up/down, move size).
    // Signals: self.time_beat (time, beat, phase, pulse),
    // self.sig (bar, bpm, energy, dt), self.user (p0..p3),
    // self.col_a/b/c/bg, self.fog (density, glow, content, -).
    shader: draw.DrawVjFxCharts {
        fx_color: fn(t: float, attr: vec4, normal: vec3, wpos: vec3) -> vec4 {
            let class = attr.x
            if class < 0.5 {
                // Candle body: col_a up / col_b down, big moves burn.
                let base = self.col_b.mix(self.col_a, step(0.5, attr.z))
                let burn = 0.75 + attr.w * 0.7 + self.time_beat.w * (1.0 - t) * 0.6
                return vec4(base.xyz * burn, 1.0 - t * 0.55)
            }
            if class < 1.5 {
                let base = self.col_b.mix(self.col_a, step(0.5, attr.z))
                return vec4(base.xyz * 0.55, (1.0 - t * 0.55) * 0.8)
            }
            if class < 2.5 {
                return vec4(self.col_a.xyz * 0.16, 0.5)
            }
            if class < 3.5 {
                // Kept modest: the bloom stage amplifies this line, and an
                // over-gained crosshair blows out into a white bar.
                let g = 0.55 + self.user.y * 0.5 + self.time_beat.w * 0.25
                return vec4(self.col_c.xyz * g, 0.8)
            }
            if class < 4.5 {
                return vec4(self.col_c.xyz * 0.5 + self.col_a.xyz * 0.4, 0.85)
            }
            return vec4(self.col_a.xyz * 0.6, 0.9)
        }
    }
}