import { Crown } from "lucide-react";
import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import { wrap } from "popmotion";
import { useEffect, useMemo, useRef, useState } from "react";

export interface ResponsiveSize {
  "2xl"?: number | string;
  base?: number | string;
  lg?: number | string;
  md?: number | string;
  sm?: number | string;
  xl?: number | string;
}

const breakpoints = {
  "2xl": 1536,
  lg: 1024,
  md: 768,
  sm: 640,
  xl: 1280,
} as const;

const DEFAULT_CARD_WIDTH = 240;
const DEFAULT_ASPECT_RATIO = 1.5625; // 5:8 ratio (500/320)

// Base sizes for responsive scaling (based on DEFAULT_CARD_WIDTH = 240)
const BASE_BADGE_FONT_SIZE = 12;
const BASE_BADGE_PADDING_X = 12;
const BASE_BADGE_PADDING_Y = 3;
const BASE_BADGE_ICON_SIZE = 14;
const BASE_TITLE_FONT_SIZE = 18;
const BASE_SUBTITLE_FONT_SIZE = 12;
const BASE_LOCATION_FONT_SIZE = 12;
const BASE_AVATAR_SIZE = 24;
const BASE_CONTENT_PADDING = 24;
const BASE_BADGE_TOP = 16;
const BASE_BADGE_LEFT = 16;
const BASE_BADGE_GAP = 8;
const BASE_AVATAR_GAP = 8;
const BASE_AVATAR_MARGIN_BOTTOM = 8;
const BASE_TITLE_MARGIN_BOTTOM = 4;
const BASE_LINE_HEIGHT = 1.4;
const BADGE_PADDING_Y_SCALE_FACTOR = 0.7; // Reduce vertical padding scaling for more compact badges

// Minimum sizes to ensure readability
const MIN_BADGE_FONT_SIZE = 10;
const MIN_BADGE_PADDING_X = 8;
const MIN_BADGE_PADDING_Y = 1;
const MIN_BADGE_ICON_SIZE = 12;
const MIN_TITLE_FONT_SIZE = 14;
const MIN_SUBTITLE_FONT_SIZE = 10;
const MIN_LOCATION_FONT_SIZE = 10;
const MIN_AVATAR_SIZE = 20;
const MIN_CONTENT_PADDING = 12;
const MIN_BADGE_TOP = 8;
const MIN_BADGE_LEFT = 8;
const MIN_BADGE_GAP = 4;
const MIN_AVATAR_GAP = 4;
const MIN_AVATAR_MARGIN_BOTTOM = 4;
const MIN_TITLE_MARGIN_BOTTOM = 2;

function formatSize(size: number | string): string {
  return typeof size === "number" ? `${size}px` : size;
}

function getInitialSize(
  size: number | string | ResponsiveSize | undefined,
  defaultValue: number | string
): string {
  if (!size) {
    return formatSize(defaultValue);
  }
  if (typeof size === "number" || typeof size === "string") {
    return formatSize(size);
  }
  // Responsive object - start with base or first available value
  if (size.base !== undefined) {
    return formatSize(size.base);
  }
  return formatSize(defaultValue);
}

function getSizeForBreakpoint(
  size: ResponsiveSize,
  width: number
): number | string | undefined {
  if (width >= breakpoints["2xl"]) {
    return size["2xl"] ?? size.xl ?? size.lg ?? size.md ?? size.sm ?? size.base;
  }
  if (width >= breakpoints.xl) {
    return size.xl ?? size.lg ?? size.md ?? size.sm ?? size.base;
  }
  if (width >= breakpoints.lg) {
    return size.lg ?? size.md ?? size.sm ?? size.base;
  }
  if (width >= breakpoints.md) {
    return size.md ?? size.sm ?? size.base;
  }
  if (width >= breakpoints.sm) {
    return size.sm ?? size.base;
  }
  return size.base;
}

function useResponsiveSize(
  size: number | string | ResponsiveSize | undefined,
  defaultValue: number | string
): string {
  const [currentSize, setCurrentSize] = useState<string>(() =>
    getInitialSize(size, defaultValue)
  );

  useEffect(() => {
    if (!size || typeof size === "number" || typeof size === "string") {
      return;
    }

    const updateSize = () => {
      const width = window.innerWidth;
      const selectedSize = getSizeForBreakpoint(size, width);

      if (selectedSize !== undefined) {
        const newSize = formatSize(selectedSize);
        setCurrentSize(newSize);
      }
    };

    updateSize();
    window.addEventListener("resize", updateSize);
    return () => window.removeEventListener("resize", updateSize);
  }, [size]);

  return currentSize;
}

function parseSize(size: string): number {
  const num = Number.parseFloat(size);
  return Number.isNaN(num) ? 0 : num;
}

function calculateHeightFromWidth(width: string, aspectRatio: number): string {
  const widthNum = parseSize(width);
  if (widthNum === 0) {
    return width;
  }
  const heightNum = widthNum * aspectRatio;
  return `${heightNum}px`;
}

export interface Participant {
  avatar: string;
}

export interface Event {
  backgroundClassName?: string;
  badge?: string;
  id: number;
  image?: string;
  location: string;
  participants?: Participant[];
  subtitle?: string;
  title?: string;
}

export interface AppleInvitesProps {
  activeIndex?: number;
  aspectRatio?: number;
  cardClassName?: string;
  cardHeight?: number | string | ResponsiveSize;
  cardWidth?: number | string | ResponsiveSize;
  className?: string;
  events: Event[];
  interval?: number;
  onChange?: (index: number) => void;
}

export default function AppleInvites({
  events,
  interval = 3000,
  className = "",
  cardClassName = "",
  activeIndex: controlledIndex,
  onChange,
  cardWidth = DEFAULT_CARD_WIDTH,
  cardHeight,
  aspectRatio = DEFAULT_ASPECT_RATIO,
}: AppleInvitesProps) {
  const shouldReduceMotion = useReducedMotion();
  const [internalPage, setInternalPage] = useState(0);
  const [direction, setDirection] = useState(0);
  const responsiveWidth = useResponsiveSize(cardWidth, DEFAULT_CARD_WIDTH);

  const variants = useMemo(
    () => ({
      center: {
        opacity: 1,
        rotate: 0,
        scale: 1,
        transition: shouldReduceMotion
          ? { duration: 0 }
          : {
              damping: 30,
              duration: 0.25,
              stiffness: 300,
              type: "spring" as const,
            },
        x: "-50%",
        zIndex: 3,
      },
      hidden: {
        opacity: 0,
        transition: shouldReduceMotion ? { duration: 0 } : { duration: 0.3 },
        zIndex: 1,
      },
      left: {
        opacity: 0.8,
        rotate: -12,
        scale: 0.9,
        transition: shouldReduceMotion
          ? { duration: 0 }
          : {
              damping: 30,
              duration: 0.25,
              stiffness: 300,
              type: "spring" as const,
            },
        x: "-130%",
        zIndex: 2,
      },
      right: {
        opacity: 0.8,
        rotate: 12,
        scale: 0.9,
        transition: shouldReduceMotion
          ? { duration: 0 }
          : {
              damping: 30,
              duration: 0.25,
              stiffness: 300,
              type: "spring" as const,
            },
        x: "30%",
        zIndex: 2,
      },
    }),
    [shouldReduceMotion]
  );
  const explicitHeight = useResponsiveSize(
    cardHeight,
    calculateHeightFromWidth(responsiveWidth, aspectRatio)
  );
  const [calculatedHeight, setCalculatedHeight] = useState<string>(() =>
    calculateHeightFromWidth(responsiveWidth, aspectRatio)
  );

  // Update calculated height when width changes (if using aspect ratio)
  useEffect(() => {
    if (cardHeight === undefined) {
      setCalculatedHeight(
        calculateHeightFromWidth(responsiveWidth, aspectRatio)
      );
    }
  }, [responsiveWidth, aspectRatio, cardHeight]);

  const responsiveHeight =
    cardHeight === undefined ? calculatedHeight : explicitHeight;

  // Calculate responsive sizes based on card width
  const cardWidthNum = parseSize(responsiveWidth);
  const scaleFactor = cardWidthNum / DEFAULT_CARD_WIDTH;

  // Responsive sizes for internal content
  const badgeFontSize = Math.max(
    MIN_BADGE_FONT_SIZE,
    Math.round(BASE_BADGE_FONT_SIZE * scaleFactor)
  );
  const badgePaddingX = Math.max(
    MIN_BADGE_PADDING_X,
    Math.round(BASE_BADGE_PADDING_X * scaleFactor)
  );
  // Use a more aggressive scaling for vertical padding to keep it compact
  // Scale padding Y less aggressively to keep badges more compact
  const badgePaddingY = Math.max(
    MIN_BADGE_PADDING_Y,
    Math.round(
      BASE_BADGE_PADDING_Y * scaleFactor * BADGE_PADDING_Y_SCALE_FACTOR
    )
  );
  const badgeIconSize = Math.max(
    MIN_BADGE_ICON_SIZE,
    Math.round(BASE_BADGE_ICON_SIZE * scaleFactor)
  );
  const titleFontSize = Math.max(
    MIN_TITLE_FONT_SIZE,
    Math.round(BASE_TITLE_FONT_SIZE * scaleFactor)
  );
  const subtitleFontSize = Math.max(
    MIN_SUBTITLE_FONT_SIZE,
    Math.round(BASE_SUBTITLE_FONT_SIZE * scaleFactor)
  );
  const locationFontSize = Math.max(
    MIN_LOCATION_FONT_SIZE,
    Math.round(BASE_LOCATION_FONT_SIZE * scaleFactor)
  );
  const avatarSize = Math.max(
    MIN_AVATAR_SIZE,
    Math.round(BASE_AVATAR_SIZE * scaleFactor)
  );
  const contentPadding = Math.max(
    MIN_CONTENT_PADDING,
    Math.round(BASE_CONTENT_PADDING * scaleFactor)
  );
  const badgeTop = Math.max(
    MIN_BADGE_TOP,
    Math.round(BASE_BADGE_TOP * scaleFactor)
  );
  const badgeLeft = Math.max(
    MIN_BADGE_LEFT,
    Math.round(BASE_BADGE_LEFT * scaleFactor)
  );
  const badgeGap = Math.max(
    MIN_BADGE_GAP,
    Math.round(BASE_BADGE_GAP * scaleFactor)
  );
  const avatarGap = Math.max(
    MIN_AVATAR_GAP,
    Math.round(BASE_AVATAR_GAP * scaleFactor)
  );
  const avatarMarginBottom = Math.max(
    MIN_AVATAR_MARGIN_BOTTOM,
    Math.round(BASE_AVATAR_MARGIN_BOTTOM * scaleFactor)
  );
  const titleMarginBottom = Math.max(
    MIN_TITLE_MARGIN_BOTTOM,
    Math.round(BASE_TITLE_MARGIN_BOTTOM * scaleFactor)
  );

  const page = controlledIndex === undefined ? internalPage : controlledIndex;
  const setPage = (val: number, dir: number) => {
    if (onChange) {
      onChange(val);
    } else {
      setInternalPage(val);
      setDirection(dir);
    }
  };

  const activeIndex = wrap(0, events.length, page);
  const setPageRef = useRef(setPage);

  useEffect(() => {
    setPageRef.current = setPage;
  });

  useEffect(() => {
    const timer = setInterval(() => {
      setPageRef.current(page + 1, 1);
    }, interval);
    return () => clearInterval(timer);
  }, [page, interval]);

  const visibleEvents = [-1, 0, 1].map(
    (offset) => events[wrap(0, events.length, activeIndex + offset)]
  );

  const getVariant = (index: number) => {
    if (index === 1) {
      return "center";
    }
    if (index === 0) {
      return "left";
    }
    return "right";
  };

  const renderBackground = (event: Event) => {
    if (event.backgroundClassName) {
      return <div className={`h-full w-full ${event.backgroundClassName}`} />;
    }
    if (event.image) {
      return (
        <img
          alt={event.title || ""}
          className="h-full w-full object-cover"
          draggable={false}
          height={400}
          src={event.image}
          width={400}
        />
      );
    }
    return null;
  };

  return (
    <div
      className={`relative flex h-full w-full items-center justify-center ${className}`}
    >
      <AnimatePresence custom={direction} initial={false}>
        {visibleEvents.map((event, index) => (
          <motion.div
            animate={getVariant(index)}
            className={`absolute top-1/2 left-1/2 origin-center -translate-y-1/2 ${cardClassName}`}
            custom={direction}
            exit="hidden"
            initial="hidden"
            key={event.id}
            style={{
              height: responsiveHeight,
              width: responsiveWidth,
            }}
            variants={variants}
          >
            <div className="relative h-full w-full overflow-hidden rounded-3xl bg-primary">
              {renderBackground(event)}
              {/* Badge */}
              <div
                className="absolute z-3"
                style={{
                  left: `${badgeLeft}px`,
                  top: `${badgeTop}px`,
                }}
              >
                <span
                  className="flex flex-row items-center rounded-full bg-black/30 font-medium text-white backdrop-blur-xl"
                  style={{
                    fontSize: `${badgeFontSize}px`,
                    gap: `${badgeGap}px`,
                    paddingBottom: `${badgePaddingY}px`,
                    paddingLeft: `${badgePaddingX}px`,
                    paddingRight: `${badgePaddingX}px`,
                    paddingTop: `${badgePaddingY}px`,
                  }}
                >
                  <Crown size={badgeIconSize} />
                  {event.badge}
                </span>
              </div>
              {/* Content */}
              <div
                className="absolute bottom-0 z-3 w-full rounded-b-3xl text-white"
                style={{ padding: `${contentPadding}px` }}
              >
                {/* Participant Avatars */}
                <div
                  className="mx-auto flex items-center justify-center"
                  style={{
                    gap: `${avatarGap}px`,
                    marginBottom: `${avatarMarginBottom}px`,
                  }}
                >
                  {event.participants?.map((participant, idx) => (
                    <img
                      alt={`Participant ${idx + 1}`}
                      className="rounded-full"
                      draggable={false}
                      height={avatarSize}
                      key={`participant-${participant.avatar}-${idx}`}
                      src={participant.avatar}
                      style={{
                        height: `${avatarSize}px`,
                        width: `${avatarSize}px`,
                      }}
                      width={avatarSize}
                    />
                  ))}
                </div>
                {event.title ? (
                  <p
                    className="wrap-break-word text-center font-bold"
                    style={{
                      fontSize: `${titleFontSize}px`,
                      lineHeight: BASE_LINE_HEIGHT,
                      marginBottom: `${titleMarginBottom}px`,
                    }}
                  >
                    {event.title}
                  </p>
                ) : null}
                {event.subtitle ? (
                  <p
                    className="wrap-break-word text-center opacity-90"
                    style={{
                      fontSize: `${subtitleFontSize}px`,
                      lineHeight: BASE_LINE_HEIGHT,
                    }}
                  >
                    {event.subtitle}
                  </p>
                ) : null}
                <p
                  className="wrap-break-word text-center opacity-90"
                  style={{
                    fontSize: `${locationFontSize}px`,
                    lineHeight: BASE_LINE_HEIGHT,
                  }}
                >
                  {event.location}
                </p>
              </div>
              <div className="fixed inset-x-0 bottom-0 isolate z-2 h-1/2">
                <div className="gradient-mask-t-0 absolute inset-0 overflow-hidden rounded-3xl backdrop-blur-[1px]" />
                <div className="gradient-mask-t-0 absolute inset-0 overflow-hidden rounded-3xl backdrop-blur-[2px]" />
                <div className="gradient-mask-t-0 absolute inset-0 overflow-hidden rounded-3xl backdrop-blur-[3px]" />
                <div className="gradient-mask-t-0 absolute inset-0 overflow-hidden rounded-3xl backdrop-blur-[6px]" />
                <div className="gradient-mask-t-0 absolute inset-0 overflow-hidden rounded-3xl backdrop-blur-[12px]" />
              </div>
            </div>
          </motion.div>
        ))}
      </AnimatePresence>
    </div>
  );
}
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