import { Color } from 'cc';

/**
 * Shared visual constants. Anything a layout or a colour is tuned by lives here
 * rather than being typed into each scene, so a change lands everywhere at once
 * and the scene files stay free of magic numbers.
 *
 * Lengths are in design units — the screen is always exactly 1080 wide, see
 * docs/DECISIONS.md.
 */
export const Layout = {
    designWidth: 1080,
    designHeight: 1920,

    /** Card sprite size, matching what scripts/build-art.mjs produces. */
    cardWidth: 220,
    cardHeight: 320,

    /** Cards on the table are drawn smaller so six pairs fit comfortably. */
    tableCardScale: 0.62,
    /** The opponent's hand is smaller again — it is only ever card backs. */
    opponentCardScale: 0.5,

    /** Horizontal step between neighbouring cards in the player's hand. */
    handStep: 128,
    /** Never let a hand grow wider than this; the step shrinks instead. */
    handMaxWidth: 940,
    /** How far the tapped card lifts out of the hand. */
    handLift: 48,

    /** Offset of a beating card from the card it beats. */
    beatOffset: { x: 26, y: -34 },

    /** Comfortable minimum for anything tappable, per docs/UI.md. */
    minTapSize: 120,

    screenMargin: 40,

    /**
     * Fixed anchors, in canvas coordinates (origin at the centre, y up).
     *
     * Every one of these is inside ±700, because the widest screen the game
     * supports is 4:3, and fit-width means a 4:3 phone sees only 1440 design
     * units of height — ±720 from the centre. Anything outside that band is
     * simply not on screen for those players. The hand and the action bar are
     * NOT here: they follow the bottom edge, see `bottomAnchors`.
     */
    opponentLabelY: 630,
    opponentHandY: 500,
    messageY: 355,
    deck: { x: -395, y: 215 },
    trump: { x: -300, y: 185 },
    discard: { x: 430, y: 215 },
    deckLabelY: 55,

    /**
     * The table is one row of up to six slots rather than two rows of three.
     * Six cards at 0.62 scale span 950 of the 1080 available units, and the row
     * saves the ~215 units of height that a second row would cost — height the
     * 4:3 layout cannot spare.
     */
    tableY: -30,
    tableColumnStep: 170,
    tableColumns: 6,
} as const;

/**
 * The anchors that follow the bottom of the screen instead of the centre.
 *
 * The player's hand must be reachable by a thumb and fully visible whatever the
 * screen's shape, so it is measured from the bottom edge rather than placed at
 * a fixed design coordinate. On a tall 21:9 screen this simply leaves more felt
 * between the table and the hand.
 */
export function bottomAnchors(halfHeight: number): { handY: number; actionBarY: number } {
    const handY = -halfHeight + Layout.cardHeight / 2 + 24;
    return { handY, actionBarY: handY + Layout.cardHeight / 2 + 85 };
}

/**
 * Centre x of table slot `index` when `count` cards are down.
 *
 * The row is centred on what is actually in play, not on six fixed slots — a
 * lone attacking card belongs in the middle of the table, not parked in the
 * left-hand slot of an empty grid.
 */
export function tableSlotX(index: number, count: number): number {
    return (index - (count - 1) / 2) * Layout.tableColumnStep;
}

export const Palette = {
    gold: new Color(244, 194, 69, 255),
    cream: new Color(247, 240, 222, 255),
    dim: new Color(174, 196, 182, 255),
    good: new Color(126, 217, 140, 255),
    bad: new Color(232, 116, 104, 255),
    shade: new Color(0, 0, 0, 170),
} as const;

/** How long the standard card movements take, in seconds. */
export const Timing = {
    deal: 0.28,
    dealStagger: 0.06,
    play: 0.22,
    collect: 0.3,
    flip: 0.16,
    /** Pause before the bot acts, so its moves can be followed. */
    botThinking: 0.55,
    /** Pause after a turn resolves, before the next one starts. */
    turnBreak: 0.4,
} as const;