import { memo, useEffect, useId, useRef, useState } from "react";
import { EvooCharacterSvg } from "./evoo-character/EvooCharacterSvg.js";
import { normalizeEvooPose } from "./evoo-character/pose-map.js";
import type { EvooPose } from "./evoo-character/types.js";
import { cn } from "./lib/utils.js";

export type { EvooPose } from "./evoo-character/types.js";
export {
  mapBotStatusToPose,
  mapCollaborationToPose,
  mapOnboardingToPose,
  mapPersonaArchetypeToIdlePose,
  mapStreamingToPose,
  mapVoicePhaseToPose,
  mapWelcomeContextToPose,
  EVOO_OO_TRADEMARK,
  normalizeEvooPose,
  resolveEvooPose,
  type VoicePresencePhase,
} from "./evoo-character/index.js";

/** `none` = calm idle only; `hover` = track while pointer is over mascot; `global` = legacy window tracking */
export type PointerTracking = "none" | "hover" | "global";

export interface EvooMascotProps {
  pose?: EvooPose;
  size?: number;
  /** Enables click / keyboard delight. Does not enable cursor tracking. */
  interactive?: boolean;
  trackPointer?: PointerTracking;
  className?: string;
  onClick?: () => void;
  showWordmark?: boolean;
}

type Point = { x: number; y: number };

/** Maps pointer position to clamped pupil offset relative to mascot center. */
export function pupilOffsetFromPointer(
  clientX: number,
  clientY: number,
  rect: DOMRect,
  maxOffset = 5.8,
  maxDistance = 450,
): Point {
  const centerX = rect.left + rect.width / 2;
  const centerY = rect.top + rect.height / 2;
  const dx = clientX - centerX;
  const dy = clientY - centerY;
  const distance = Math.hypot(dx, dy);
  const factor = Math.min(distance / maxDistance, 1);
  const angle = Math.atan2(dy, dx);
  return {
    x: Math.cos(angle) * factor * maxOffset,
    y: Math.sin(angle) * factor * maxOffset,
  };
}

const LOOK_AROUND_TARGETS = [
  { x: -2.8, y: 0.4 },
  { x: 2.2, y: -0.6 },
  { x: 0.4, y: -1.6 },
  { x: 1.6, y: 1.2 },
  { x: -1.4, y: -1.1 },
] as const satisfies readonly Point[];

export const EvooMascot = memo(function EvooMascot({
  pose: initialPose = "idle",
  size = 40,
  interactive = false,
  trackPointer = "none",
  className,
  onClick,
  showWordmark = false,
}: EvooMascotProps) {
  const [activePose, setActivePose] = useState<EvooPose>(initialPose);
  const [pupilOffset, setPupilOffset] = useState<Point>({ x: 0, y: 0 });
  const [saccadeOffset, setSaccadeOffset] = useState<Point>({ x: 0, y: 0 });
  const [isBlinking, setIsBlinking] = useState(false);
  const [isWinking, setIsWinking] = useState(false);
  const [isAsleep, setIsAsleep] = useState(false);
  const [hapticRipple, setHapticRipple] = useState(false);
  const containerRef = useRef<HTMLDivElement>(null);
  const filterId = useId();

  useEffect(() => {
    setActivePose(initialPose);
  }, [initialPose]);

  useEffect(() => {
    let blinkTimeout: ReturnType<typeof setTimeout>;
    const scheduleBlink = () => {
      const delay = Math.random() * 4000 + 3000;
      blinkTimeout = setTimeout(() => {
        if (!isAsleep) {
          setIsBlinking(true);
          setTimeout(() => {
            setIsBlinking(false);
            scheduleBlink();
          }, 140);
        } else {
          scheduleBlink();
        }
      }, delay);
    };
    scheduleBlink();
    return () => clearTimeout(blinkTimeout);
  }, [isAsleep]);

  useEffect(() => {
    if (isAsleep) return;
    let saccadeTimer: ReturnType<typeof setTimeout>;
    const triggerSaccade = () => {
      const delay = Math.random() * 1400 + 1600;
      saccadeTimer = setTimeout(() => {
        const angle = Math.random() * Math.PI * 2;
        const magnitude = Math.random() * 0.9 + 0.3;
        setSaccadeOffset({ x: Math.cos(angle) * magnitude, y: Math.sin(angle) * magnitude });
        setTimeout(() => {
          setSaccadeOffset({ x: 0, y: 0 });
          triggerSaccade();
        }, 650);
      }, delay);
    };
    triggerSaccade();
    return () => clearTimeout(saccadeTimer);
  }, [isAsleep]);

  useEffect(() => {
    if (isAsleep || trackPointer !== "none") return;
    let lookTimer: ReturnType<typeof setTimeout>;
    const scheduleLookAround = () => {
      const delay = Math.random() * 9000 + 11000;
      lookTimer = setTimeout(() => {
        const target = LOOK_AROUND_TARGETS[Math.floor(Math.random() * LOOK_AROUND_TARGETS.length)]!;
        setPupilOffset(target);
        setTimeout(() => {
          setPupilOffset({ x: 0, y: 0 });
          scheduleLookAround();
        }, 850);
      }, delay);
    };
    scheduleLookAround();
    return () => clearTimeout(lookTimer);
  }, [isAsleep, trackPointer]);

  useEffect(() => {
    if (trackPointer === "none") {
      setIsAsleep(false);
      return;
    }
    let sleepTimer: ReturnType<typeof setTimeout>;
    const resetSleepTimer = () => {
      if (isAsleep) setIsAsleep(false);
      clearTimeout(sleepTimer);
      sleepTimer = setTimeout(() => setIsAsleep(true), 20_000);
    };
    const handleGlobalActivity = () => resetSleepTimer();
    resetSleepTimer();
    if (trackPointer === "global") {
      window.addEventListener("pointermove", handleGlobalActivity, { passive: true });
    }
    window.addEventListener("keydown", handleGlobalActivity, { passive: true });
    window.addEventListener("touchstart", handleGlobalActivity, { passive: true });
    return () => {
      clearTimeout(sleepTimer);
      if (trackPointer === "global") {
        window.removeEventListener("pointermove", handleGlobalActivity);
      }
      window.removeEventListener("keydown", handleGlobalActivity);
      window.removeEventListener("touchstart", handleGlobalActivity);
    };
  }, [trackPointer, isAsleep]);

  useEffect(() => {
    if (trackPointer !== "global" || isAsleep) return;
    const handlePointerMove = (e: PointerEvent) => {
      if (!containerRef.current) return;
      setPupilOffset(
        pupilOffsetFromPointer(e.clientX, e.clientY, containerRef.current.getBoundingClientRect()),
      );
    };
    window.addEventListener("pointermove", handlePointerMove, { passive: true });
    return () => window.removeEventListener("pointermove", handlePointerMove);
  }, [trackPointer, isAsleep]);

  const handleLocalPointerMove = (event: React.PointerEvent<HTMLDivElement>) => {
    if (trackPointer !== "hover" || isAsleep || !containerRef.current) return;
    setPupilOffset(
      pupilOffsetFromPointer(
        event.clientX,
        event.clientY,
        containerRef.current.getBoundingClientRect(),
        4.2,
        220,
      ),
    );
  };

  const handleLocalPointerLeave = () => {
    if (trackPointer === "hover") setPupilOffset({ x: 0, y: 0 });
  };

  const handleClick = () => {
    setIsAsleep(false);
    if (onClick) {
      onClick();
      return;
    }
    setHapticRipple(true);
    setIsWinking(true);
    setTimeout(() => setIsWinking(false), 260);
    setTimeout(() => setHapticRipple(false), 550);
    const canonical = normalizeEvooPose(activePose);
    const nextPose: EvooPose =
      canonical === "idle" ? "greeting" : canonical === "greeting" ? "success" : "idle";
    setActivePose(nextPose);
    setTimeout(() => setActivePose(initialPose), 2800);
  };

  const finalPupilX = pupilOffset.x + saccadeOffset.x;
  const finalPupilY = pupilOffset.y + saccadeOffset.y;

  const mascotTitle = interactive
    ? isAsleep && trackPointer !== "none"
      ? "evOo schläft tief… Bewege die Maus zum Aufwecken!"
      : "evOo · Klick mich!"
    : undefined;

  return (
    // biome-ignore lint/a11y/noStaticElementInteractions: role is conditionally applied based on interactive prop
    <div
      ref={containerRef}
      onClick={interactive ? handleClick : undefined}
      onPointerMove={trackPointer === "hover" ? handleLocalPointerMove : undefined}
      onPointerLeave={trackPointer === "hover" ? handleLocalPointerLeave : undefined}
      onKeyDown={
        interactive
          ? (event) => {
              if (event.key === "Enter" || event.key === " ") {
                event.preventDefault();
                handleClick();
              }
            }
          : undefined
      }
      role={interactive ? "button" : undefined}
      tabIndex={interactive ? 0 : undefined}
      title={mascotTitle}
      className={cn(
        "evoo-mascot-container relative inline-flex items-end select-none group/mascot outline-none",
        interactive && "cursor-pointer",
        className,
      )}
    >
      {showWordmark && (
        <div
          className="mr-[2px] flex flex-col justify-end"
          style={{ height: size * 0.86, paddingBottom: size * 0.23 }}
        >
          <span
            className="font-['EvOo_Display',sans-serif] font-bold tracking-tight text-emerald-400 leading-none inline-flex items-baseline select-none"
            style={{ fontSize: size * 0.65 }}
          >
            <span className="tracking-[-0.03em]">e</span>
            <span className="tracking-[-0.05em]">v</span>
          </span>
        </div>
      )}
      <div
        className={cn(
          "relative flex items-center justify-center transition-transform",
          "duration-300 ease-[cubic-bezier(0.16,1,0.3,1)] group-hover/mascot:scale-105 active:scale-95",
        )}
        style={{ width: size, height: size * 0.88 }}
      >
        <svg viewBox="0 0 140 120" width={size} height={size * 0.86} className="overflow-visible" aria-hidden="true">
          <defs>
            <linearGradient id={`${filterId}-aura`} x1="0" y1="0" x2="1" y2="1">
              <stop offset="0%" stopColor="#00E676" />
              <stop offset="100%" stopColor="#00B0FF" />
            </linearGradient>
            <linearGradient id={`${filterId}-capsule-glass`} x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stopColor="#FFFFFF" stopOpacity="0.95" />
              <stop offset="100%" stopColor="#E2E8F0" stopOpacity="0.8" />
            </linearGradient>
            <radialGradient id={`${filterId}-solar-core`} cx="0.5" cy="0.5" r="0.5">
              <stop offset="0%" stopColor="#10B981" stopOpacity="0.75" />
              <stop offset="60%" stopColor="#059669" stopOpacity="0.35" />
              <stop offset="100%" stopColor="#047857" stopOpacity="0" />
            </radialGradient>
            <radialGradient id={`${filterId}-quantum-pulse`} cx="0.5" cy="0.5" r="0.5">
              <stop offset="0%" stopColor="#38BDF8" stopOpacity="0.9" />
              <stop offset="70%" stopColor="#0284C7" stopOpacity="0.4" />
              <stop offset="100%" stopColor="#0369A1" stopOpacity="0" />
            </radialGradient>
          </defs>
          <EvooCharacterSvg
            filterId={filterId}
            pose={activePose}
            pupilX={finalPupilX}
            pupilY={finalPupilY}
            isBlinking={isBlinking}
            isWinking={isWinking}
            isAsleep={isAsleep}
            hapticRipple={hapticRipple}
          />
        </svg>
      </div>
    </div>
  );
});

/** Sidebar / chrome logo — calm idle life, click delight, no global eye-tracking. */
export function Wordmark({ className }: { className?: string }) {
  return (
    <div className={cn("flex items-center gap-2", className)}>
      <EvooMascot size={46} interactive showWordmark trackPointer="none" />
    </div>
  );
}