// Speedway — a complete 4-car race built only from blocks.
// The engine drives the cars, tracks the laps and sorts the standings; this
// file is layout and rules. Compare with sandbox3d.splash, where every actor
// hand-rolled its own physics and AI.

let LAPS = 3
let TRACK = [
    vec3(0, 0, -60), vec3(34, 0, -52), vec3(52, 0, -30), vec3(56, 0, 0),
    vec3(52, 0, 30), vec3(34, 0, 52), vec3(0, 0, 60), vec3(-34, 0, 52),
    vec3(-52, 0, 30), vec3(-56, 0, 0), vec3(-52, 0, -30), vec3(-34, 0, -52),
]
let COLORS = [#xe8594f, #x4f8fe8, #x4fe87a, #xe8d24f]
let NAMES = ["You", "Rosa", "Kim", "Bex"]

game.sky({})
game.terrain({size: 260, cells: 81, smooth: true, seed: 4, freq: 0.006, amp: 3,
              plaza: {r: 120, ramp: 20, h: 0}, color: #x6b8f4a})

// Track surface: a slab under every corner, plus barriers on the outside.
for p in TRACK {
    game.box({pos: vec3(p.x, 0.1, p.z), size: vec3(22, 0.2, 22), color: #x3b3f47, collide: false})
    let out = p.normalized()
    game.box({pos: vec3(out.x * 15 + p.x, 1.2, out.z * 15 + p.z),
              size: vec3(6, 2.4, 6), color: #xd8d8d8, tag: "wall"})
}

// Start grid + gates. One spawnpoint and one checkpoint per corner.
for i in 0..TRACK.len() {
    game.checkpoint({pos: vec3(TRACK[i].x, 3, TRACK[i].z), size: vec3(11, 6, 11)})
}
for i in 0..4 {
    game.spawnpoint({pos: vec3(-6 + i * 4, 1.5, -60 + (i % 2) * 6), yaw: 0})
}

// Four cars: seat 0 is the player, the rest follow the racing line.
let cars = []
for i in 0..4 {
    let car = game.car({color: COLORS[i], player: i == 0, top_speed: 26 - i * 0.5})
    game.place(car, i)
    game.label(car, NAMES[i])
    if i > 0 {
        game.autodrive(car, {points: TRACK, pace: 0.86 + i * 0.03})
    }
    cars.push(car)
}
game.camera({chase: cars[0], height: 3.2, boom: 13, pitch: -0.22, lag: 0.25})
game.race({laps: LAPS})

let done = false
game.on_tick(|dt, input| {
    // Standings board, leader first.
    let board = ""
    let order = game.standings()
    for i in 0..order.len() {
        let s = order[i]
        board = board + (i + 1) + ". " + game.tag(s.entity) + "  lap " + min(s.lap + 1, LAPS) + "/" + LAPS + "\n"
    }
    game.text("board", board, {anchor: "top_left"})
    game.bar("speed", game.speed(cars[0]) / 26, {anchor: "bottom"})

    if !done && game.finished(cars[0]) {
        done = true
        game.text("center", "P" + game.rank(cars[0]) + " — press R to race again", {})
        game.jingle("C5 E5 G5 C6", 140)
    }
    if input.reset_pressed {
        done = false
        game.text("center", "", {})
        for i in 0..4 { game.place(cars[i], i) }
        game.race({laps: LAPS})
    }
})