// Data model for the map renderer.
//
// World coordinates are TypeScript numbers (float64). The world is a
// rectangle [0, W) × [0, H). When wrap mode is 'torus', the world
// behaves toroidally — primitives near the right edge are visible at
// the left edge once the camera scrolls past, etc. When wrap mode is
// 'no-wrap', the world is a bounded plane and the camera is clamped
// at its edges.
//
// The algorithm specification for hit-test, torus wrap, and no-wrap
// camera behaviour lives in ui/docs/renderer.md. See that document
// before changing the contract of the types in this file.

export type PrimitiveID = number;

export type WrapMode = "torus" | "no-wrap";

// Style describes the visual appearance of a primitive. Any field may
// be omitted; missing fields fall back to the active theme defaults.
export interface Style {
	fillColor?: number; // 0xRRGGBB
	fillAlpha?: number; // 0..1
	strokeColor?: number; // 0xRRGGBB
	strokeAlpha?: number; // 0..1
	strokeWidthPx?: number; // pixels at any zoom
	pointRadiusPx?: number; // pixels at any zoom (for kind === 'point')
	// strokeDashPx — when set on a `LinePrim`, the line is rendered as
	// a dashed pattern whose dash and gap are both this length. When
	// unset (or zero), the stroke is solid. Interpreted in the same
	// world-unit space as `strokeWidthPx`, so the dash spacing scales
	// with the camera. Phase 19 uses this for the IncomingGroup
	// trajectory line; ignored on point and circle primitives.
	strokeDashPx?: number;
}

// PrimitiveBase carries the fields shared by every primitive kind.
//
// priority is used for deterministic ordering during hit-test: higher
// priority wins ties. hitSlopPx is an optional per-primitive override
// of the kind default, in screen pixels.
export interface PrimitiveBase {
	id: PrimitiveID;
	priority: number;
	style: Style;
	hitSlopPx: number; // 0 = use kind default
}

export interface PointPrim extends PrimitiveBase {
	kind: "point";
	x: number;
	y: number;
}

export interface CirclePrim extends PrimitiveBase {
	kind: "circle";
	x: number;
	y: number;
	radius: number; // world units
}

export interface LinePrim extends PrimitiveBase {
	kind: "line";
	x1: number;
	y1: number;
	x2: number;
	y2: number;
}

export type Primitive = PointPrim | CirclePrim | LinePrim;

export type PrimitiveKind = Primitive["kind"];

// Default hit slop in screen pixels per primitive kind. Added on top
// of the visible footprint of each primitive — for points, the
// effective hit radius is `pointRadiusPx + slopPx`. Chosen for touch
// ergonomics; per-primitive `hitSlopPx` overrides the default.
export const DEFAULT_HIT_SLOP_PX: Record<PrimitiveKind, number> = {
	point: 4,
	circle: 6,
	line: 6,
};

// Default world-unit radius drawn for a `PointPrim` when its
// `style.pointRadiusPx` is unset. Shared between the renderer
// (`render.ts.drawPoint`) and the hit-test
// (`hit-test.ts.matchPoint`) so the click target always covers the
// visible disc.
export const DEFAULT_POINT_RADIUS_PX = 3;

// kindOrder is the deterministic tie-break order used during hit-test
// when two primitives match a cursor at identical priority and
// distance. Smaller value wins.
export const KIND_ORDER: Record<PrimitiveKind, number> = {
	point: 0,
	line: 1,
	circle: 2,
};

// Camera describes the world point at the centre of the viewport and
// the scale (pixels per world unit). Pan/zoom mutate this struct;
// `pixi-viewport` keeps its own internal state and we mirror it here
// for hit-test and for tests that read camera state directly.
export interface Camera {
	centerX: number;
	centerY: number;
	scale: number;
}

export interface Viewport {
	widthPx: number;
	heightPx: number;
}

// World is the immutable container of primitives plus the toroidal
// dimensions. The renderer reindexes nothing — the brute-force
// hit-test walks all primitives on every pointer event, which is
// adequate for the ~1000-primitive Phase 9 budget.
export class World {
	readonly width: number;
	readonly height: number;
	readonly primitives: Primitive[];

	constructor(width: number, height: number, primitives: Primitive[] = []) {
		if (!(width > 0) || !(height > 0)) {
			throw new Error(`World: width and height must be positive, got ${width}×${height}`);
		}
		this.width = width;
		this.height = height;
		this.primitives = primitives;
	}
}

// Theme is the renderer's colour palette. It carries both the generic
// fallbacks used when a primitive's `style` omits a colour and the
// semantic colours every primitive builder paints with (planets, ship
// groups, cargo routes, battle / bombing markers, reach + selection
// rings, pending-Send tracks, and the pick-mode overlay). Two concrete
// palettes are shipped — `DARK_THEME` and `LIGHT_THEME` — and the map
// view selects between them from the resolved app theme
// (`$lib/theme/theme.svelte.ts`), so the canvas follows the user's
// light / dark choice like the rest of the chrome.
//
// Only colours live here: per-primitive alphas, widths, and radii are
// emphasis / geometry, not theme, and stay as constants in the builder
// modules. The light palette mirrors the dark one role-for-role but
// darkens / saturates each hue so it reads against a light background;
// the incoming-group, battle, and bombing accents stay deliberately
// vivid in both palettes.
export interface Theme {
	// Canvas background and the visibility-fog veil drawn over
	// unscanned hyperspace.
	background: number;
	fog: number;
	// Generic fallbacks for primitives whose `style` omits a colour.
	pointFill: number;
	circleStroke: number;
	lineStroke: number;
	// Planet glyphs, one colour per `ReportPlanet.kind`.
	planetLocal: number;
	planetOther: number;
	planetUninhabited: number;
	planetUnidentified: number;
	// Ship groups. The in-space track reuses `shipLocal` and the
	// incoming trajectory line reuses `shipIncoming`.
	shipLocal: number;
	shipOther: number;
	shipIncoming: number;
	shipUnidentified: number;
	// Cargo-route arrows, one colour per load type.
	routeCol: number;
	routeCap: number;
	routeMat: number;
	routeEmp: number;
	// Battle X-crosses and bombing rings (damaged vs wiped).
	battleMarker: number;
	bombingDamaged: number;
	bombingWiped: number;
	// Reach rings, the selected-planet ring, and pending-Send tracks.
	reachCircle: number;
	selectionRing: number;
	pendingSend: number;
	// Pick-mode overlay: the anchor / cursor-line / hover highlight
	// colour and the multiply tint applied to non-reachable primitives.
	pickHighlight: number;
	pickDimTint: number;
}

export const DARK_THEME: Theme = {
	background: 0x0a0e1a,
	fog: 0x12162a,
	pointFill: 0xe8eaf6,
	circleStroke: 0x4fc3f7,
	lineStroke: 0xa5d6a7,
	planetLocal: 0x6dd2ff,
	planetOther: 0xff8a65,
	planetUninhabited: 0xb0bec5,
	planetUnidentified: 0x546e7a,
	shipLocal: 0xfff176,
	shipOther: 0xff6f40,
	shipIncoming: 0xff5252,
	shipUnidentified: 0x9aa3a8,
	routeCol: 0x4fc3f7,
	routeCap: 0xffb74d,
	routeMat: 0x81c784,
	routeEmp: 0x90a4ae,
	battleMarker: 0xffd400,
	bombingDamaged: 0xffd400,
	bombingWiped: 0xff3030,
	reachCircle: 0x6d8cff,
	selectionRing: 0x6d8cff,
	pendingSend: 0x66bb6a,
	pickHighlight: 0xffe082,
	pickDimTint: 0x303841,
};

// LIGHT_THEME mirrors DARK_THEME role-for-role. The background matches
// the app's light shell background (`--color-bg` in `tokens.css`) so
// the canvas blends into the surrounding chrome instead of reading as a
// dark rectangle; the fog is a faint darkening over the lighter base.
// Hues are darkened / saturated relative to the dark palette so small
// glyphs and thin strokes stay legible on a light surface, while the
// incoming (red), battle (amber), and bombing (amber / red) accents are
// kept vivid. Values are a first pass meant to be refined during the
// owner's F8 manual-QA loop.
export const LIGHT_THEME: Theme = {
	background: 0xf3f5fb,
	fog: 0xe2e7f1,
	pointFill: 0x1a2138,
	circleStroke: 0x1565c0,
	lineStroke: 0x2e7d32,
	planetLocal: 0x1565c0,
	planetOther: 0xe64a19,
	planetUninhabited: 0x78909c,
	planetUnidentified: 0x90a4ae,
	shipLocal: 0xc79100,
	shipOther: 0xd84315,
	shipIncoming: 0xd50000,
	shipUnidentified: 0x607d8b,
	routeCol: 0x0288d1,
	routeCap: 0xef6c00,
	routeMat: 0x2e7d32,
	routeEmp: 0x607d8b,
	battleMarker: 0xf57f17,
	bombingDamaged: 0xf57f17,
	bombingWiped: 0xc62828,
	reachCircle: 0x3949ab,
	selectionRing: 0x3949ab,
	pendingSend: 0x388e3c,
	pickHighlight: 0xef6c00,
	pickDimTint: 0xaeb6c4,
};