import { AnimatePresence, motion } from "motion/react";
import { useEffect, useRef, useState, type RefObject } from "react";
import { Compass, Focus, HelpCircle, LayoutTemplate, Minus, Plus } from "lucide-react";

import { FloatingDock, type FloatingDockEntry } from "@/components/ui/aceternity/floating-dock";
import { aceternityMotion } from "@/lib/aceternity-motion";
import { canvasDockStyle } from "@/lib/canvas/canvas-aceternity-style";
import { canvasThemes } from "@/lib/canvas-theme";
import { subscribeCanvasViewportPreview } from "@/lib/canvas/canvas-live-viewport";
import { useActiveTheme } from "@/stores/canvas/use-canvas-theme-store";

type CanvasZoomControlsProps = {
    scale: number;
    onScaleChange: (scale: number) => void;
    onFitContent: () => void;
    onAutoArrange?: () => void;
    isMiniMapOpen: boolean;
    onToggleMiniMap: () => void;
    onOpenShortcuts: () => void;
    containerRef?: RefObject<HTMLDivElement | null>;
};

const QUICK_ZOOM_LEVELS = [0.25, 0.5, 1, 2] as const;

export function CanvasZoomControls({ scale, onScaleChange, onFitContent, onAutoArrange, isMiniMapOpen, onToggleMiniMap, onOpenShortcuts, containerRef }: CanvasZoomControlsProps) {
    const theme = canvasThemes[useActiveTheme()];
    const rootRef = useRef<HTMLDivElement>(null);
    const liveScaleRef = useRef(scale);
    const rangeRef = useRef<HTMLInputElement>(null);
    const dockLabelRef = useRef<HTMLSpanElement>(null);
    const panelLabelRef = useRef<HTMLSpanElement>(null);
    const [precisionOpen, setPrecisionOpen] = useState(false);

    useEffect(() => updateScaleDisplay(scale), [scale]);

    useEffect(() => {
        const container = containerRef?.current;
        if (!container) return;
        return subscribeCanvasViewportPreview(container, (viewport) => updateScaleDisplay(viewport.k));
    }, [containerRef]);

    useEffect(() => {
        if (!precisionOpen) return;
        const close = (event: PointerEvent) => {
            if (event.target instanceof Node && !rootRef.current?.contains(event.target)) setPrecisionOpen(false);
        };
        const closeOnEscape = (event: KeyboardEvent) => {
            if (event.key === "Escape") setPrecisionOpen(false);
        };
        document.addEventListener("pointerdown", close, true);
        document.addEventListener("keydown", closeOnEscape);
        return () => {
            document.removeEventListener("pointerdown", close, true);
            document.removeEventListener("keydown", closeOnEscape);
        };
    }, [precisionOpen]);

    function updateScaleDisplay(nextScale: number) {
        liveScaleRef.current = nextScale;
        const percent = String(Math.round(nextScale * 100));
        if (rangeRef.current) rangeRef.current.value = percent;
        if (dockLabelRef.current) dockLabelRef.current.textContent = percent;
        if (panelLabelRef.current) panelLabelRef.current.textContent = `${percent}%`;
    }

    function commitScale(nextScale: number) {
        const clampedScale = Math.min(2, Math.max(0.05, nextScale));
        updateScaleDisplay(clampedScale);
        onScaleChange(clampedScale);
    }

    const items: FloatingDockEntry[] = [
        { id: "zoom-minimap", label: isMiniMapOpen ? "关闭小地图" : "打开小地图", icon: <Compass />, active: isMiniMapOpen, onClick: onToggleMiniMap },
        { id: "zoom-fit", label: "适应画布", icon: <Focus />, onClick: onFitContent },
        ...(onAutoArrange ? [{ id: "zoom-auto-arrange", label: "自动整理节点", icon: <LayoutTemplate />, onClick: onAutoArrange }] : []),
        { kind: "separator", id: "zoom-separator" },
        { id: "zoom-out", label: "缩小画布", icon: <Minus />, onClick: () => commitScale(liveScaleRef.current - 0.1) },
        {
            id: "zoom-precision",
            label: "精确缩放",
            wide: true,
            quiet: true,
            icon: <span className="inline-flex h-full items-center justify-center whitespace-nowrap text-[var(--fs-caption)] font-semibold leading-none tabular-nums"><span ref={dockLabelRef}>{Math.round(scale * 100)}</span><span className="ml-px text-[var(--fs-micro)] font-medium leading-none opacity-50">%</span></span>,
            active: precisionOpen,
            onClick: () => setPrecisionOpen((value) => !value),
        },
        { id: "zoom-in", label: "放大画布", icon: <Plus />, onClick: () => commitScale(liveScaleRef.current + 0.1) },
        { kind: "separator", id: "help-separator" },
        { id: "zoom-shortcuts", label: "画布快捷键", icon: <HelpCircle />, onClick: onOpenShortcuts },
    ];

    return (
        <div ref={rootRef} data-canvas-no-zoom className="relative z-[var(--z-toolbar)]" onMouseDown={(event) => event.stopPropagation()} onPointerDown={(event) => event.stopPropagation()} onWheel={(event) => event.stopPropagation()}>
            <AnimatePresence>
                {precisionOpen ? (
                    <motion.div
                        initial={{ opacity: 0, y: 14, scale: 0.92 }}
                        animate={{ opacity: 1, y: 0, scale: 1 }}
                        exit={{ opacity: 0, y: 9, scale: 0.96 }}
                        transition={aceternityMotion.spring.panel}
                        className="aceternity-floating-panel absolute bottom-[var(--canvas-dock-popover-offset)] left-0 w-[220px] overflow-hidden rounded-[var(--panel-radius)] border p-2.5 backdrop-blur-2xl"
                        style={{ background: theme.spatial.elevated, borderColor: theme.toolbar.border, color: theme.node.text, boxShadow: `0 28px 80px ${theme.spatial.shadow}` }}
                    >
                        <div className="absolute inset-x-10 top-0 h-px" style={{ background: `linear-gradient(90deg, transparent, ${theme.spatial.glowStrong}, transparent)` }} />
                        <div className="flex items-center justify-between gap-3">
                            <span>
                                <span className="block text-[var(--fs-tiny)] font-semibold">画布尺度</span>
                                <span className="mt-0.5 block text-[var(--fs-micro)]" style={{ color: theme.node.muted }}>精确控制视野密度</span>
                            </span>
                            <span ref={panelLabelRef} className="rounded-full border px-2 py-0.5 text-[var(--fs-tiny)] font-semibold tabular-nums" style={{ background: theme.spatial.surface, borderColor: theme.toolbar.border, color: theme.accent.primary }}>
                                {Math.round(scale * 100)}%
                            </span>
                        </div>
                        <input
                            ref={rangeRef}
                            type="range"
                            min="5"
                            max="200"
                            step="1"
                            defaultValue={Math.round(scale * 100)}
                            className="aceternity-zoom-range mt-3 h-4 w-full"
                            style={{ accentColor: theme.accent.primary }}
                            onChange={(event) => commitScale(Number(event.target.value) / 100)}
                            aria-label="精确缩放画布"
                        />
                        <div className="mt-2.5 grid grid-cols-4 gap-1">
                            {QUICK_ZOOM_LEVELS.map((level) => (
                                <motion.button
                                    key={level}
                                    type="button"
                                    whileHover={{ y: -1 }}
                                    whileTap={{ scale: 0.95 }}
                                    transition={aceternityMotion.spring.dock}
                                    className="h-7 rounded-[var(--dock-item-radius)] border text-[var(--fs-micro)] font-semibold tabular-nums outline-none focus-visible:ring-2"
                                    style={{ background: theme.spatial.surface, borderColor: theme.toolbar.border, color: theme.node.muted }}
                                    onClick={() => commitScale(level)}
                                >
                                    {Math.round(level * 100)}%
                                </motion.button>
                            ))}
                        </div>
                    </motion.div>
                ) : null}
            </AnimatePresence>

            <FloatingDock items={items} className="canvas-floating-dock" style={canvasDockStyle(theme)} ariaLabel="画布视图控制" />
        </div>
    );
}