import {
	type CombatantId,
	type ConditionId,
	deriveHpStatus,
} from "@initiative/domain";
import { Brain, X } from "lucide-react";
import { type Ref, useCallback, useEffect, useRef, useState } from "react";
import { cn } from "../lib/utils";
import { AcShield } from "./ac-shield";
import { ConditionPicker } from "./condition-picker";
import { ConditionTags } from "./condition-tags";
import { D20Icon } from "./d20-icon";
import { HpAdjustPopover } from "./hp-adjust-popover";
import { ConfirmButton } from "./ui/confirm-button";
import { Input } from "./ui/input";

interface Combatant {
	readonly id: CombatantId;
	readonly name: string;
	readonly initiative?: number;
	readonly maxHp?: number;
	readonly currentHp?: number;
	readonly ac?: number;
	readonly conditions?: readonly ConditionId[];
	readonly isConcentrating?: boolean;
}

interface CombatantRowProps {
	combatant: Combatant;
	isActive: boolean;
	onRename: (id: CombatantId, newName: string) => void;
	onSetInitiative: (id: CombatantId, value: number | undefined) => void;
	onRemove: (id: CombatantId) => void;
	onSetHp: (id: CombatantId, maxHp: number | undefined) => void;
	onAdjustHp: (id: CombatantId, delta: number) => void;
	onSetAc: (id: CombatantId, value: number | undefined) => void;
	onToggleCondition: (id: CombatantId, conditionId: ConditionId) => void;
	onToggleConcentration: (id: CombatantId) => void;
	onShowStatBlock?: () => void;
	onRollInitiative?: (id: CombatantId) => void;
}

function EditableName({
	name,
	combatantId,
	onRename,
	onShowStatBlock,
}: {
	name: string;
	combatantId: CombatantId;
	onRename: (id: CombatantId, newName: string) => void;
	onShowStatBlock?: () => void;
}) {
	const [editing, setEditing] = useState(false);
	const [draft, setDraft] = useState(name);
	const inputRef = useRef<HTMLInputElement>(null);
	const clickTimerRef = useRef<ReturnType<typeof setTimeout>>(undefined);
	const longPressTimerRef = useRef<ReturnType<typeof setTimeout>>(undefined);
	const longPressTriggeredRef = useRef(false);

	const commit = useCallback(() => {
		const trimmed = draft.trim();
		if (trimmed !== "" && trimmed !== name) {
			onRename(combatantId, trimmed);
		}
		setEditing(false);
	}, [draft, name, combatantId, onRename]);

	const startEditing = useCallback(() => {
		setDraft(name);
		setEditing(true);
		requestAnimationFrame(() => inputRef.current?.select());
	}, [name]);

	useEffect(() => {
		return () => {
			clearTimeout(clickTimerRef.current);
			clearTimeout(longPressTimerRef.current);
		};
	}, []);

	const handleClick = useCallback(
		(e: React.MouseEvent) => {
			e.stopPropagation();
			if (longPressTriggeredRef.current) {
				longPressTriggeredRef.current = false;
				return;
			}
			if (clickTimerRef.current) {
				clearTimeout(clickTimerRef.current);
				clickTimerRef.current = undefined;
				startEditing();
			} else {
				clickTimerRef.current = setTimeout(() => {
					clickTimerRef.current = undefined;
					onShowStatBlock?.();
				}, 250);
			}
		},
		[startEditing, onShowStatBlock],
	);

	const handleTouchStart = useCallback(() => {
		longPressTriggeredRef.current = false;
		longPressTimerRef.current = setTimeout(() => {
			longPressTriggeredRef.current = true;
			startEditing();
		}, 500);
	}, [startEditing]);

	const cancelLongPress = useCallback(() => {
		clearTimeout(longPressTimerRef.current);
	}, []);

	if (editing) {
		return (
			<Input
				ref={inputRef}
				type="text"
				value={draft}
				className="h-7 text-sm"
				onChange={(e) => setDraft(e.target.value)}
				onBlur={commit}
				onKeyDown={(e) => {
					if (e.key === "Enter") commit();
					if (e.key === "Escape") setEditing(false);
				}}
			/>
		);
	}

	return (
		<>
			<button
				type="button"
				onClick={handleClick}
				onTouchStart={handleTouchStart}
				onTouchEnd={cancelLongPress}
				onTouchCancel={cancelLongPress}
				onTouchMove={cancelLongPress}
				className="truncate text-left text-sm text-foreground cursor-text hover:text-hover-neutral transition-colors"
			>
				{name}
			</button>
		</>
	);
}

function MaxHpDisplay({
	maxHp,
	onCommit,
}: {
	maxHp: number | undefined;
	onCommit: (value: number | undefined) => void;
}) {
	const [editing, setEditing] = useState(false);
	const [draft, setDraft] = useState(maxHp?.toString() ?? "");
	const inputRef = useRef<HTMLInputElement>(null);

	const commit = useCallback(() => {
		if (draft === "") {
			onCommit(undefined);
		} else {
			const n = Number.parseInt(draft, 10);
			if (!Number.isNaN(n) && n >= 1) {
				onCommit(n);
			}
		}
		setEditing(false);
	}, [draft, onCommit]);

	const startEditing = useCallback(() => {
		setDraft(maxHp?.toString() ?? "");
		setEditing(true);
		requestAnimationFrame(() => inputRef.current?.select());
	}, [maxHp]);

	if (editing) {
		return (
			<Input
				ref={inputRef}
				type="text"
				inputMode="numeric"
				value={draft}
				placeholder="Max"
				className="h-7 w-[7ch] text-center text-sm tabular-nums"
				onChange={(e) => setDraft(e.target.value)}
				onBlur={commit}
				onKeyDown={(e) => {
					if (e.key === "Enter") commit();
					if (e.key === "Escape") setEditing(false);
				}}
			/>
		);
	}

	return (
		<button
			type="button"
			onClick={startEditing}
			className="inline-block h-7 min-w-[3ch] text-center text-sm leading-7 tabular-nums text-muted-foreground transition-colors hover:text-hover-neutral"
		>
			{maxHp ?? "Max"}
		</button>
	);
}

function ClickableHp({
	currentHp,
	maxHp,
	onAdjust,
	dimmed,
}: {
	currentHp: number | undefined;
	maxHp: number | undefined;
	onAdjust: (delta: number) => void;
	dimmed?: boolean;
}) {
	const [popoverOpen, setPopoverOpen] = useState(false);
	const status = deriveHpStatus(currentHp, maxHp);

	if (maxHp === undefined) {
		return (
			<span
				className={cn(
					"inline-block h-7 w-[4ch] text-center text-sm leading-7 tabular-nums text-muted-foreground",
					dimmed && "opacity-50",
				)}
			>
				--
			</span>
		);
	}

	return (
		<div className="relative">
			<button
				type="button"
				onClick={() => setPopoverOpen(true)}
				className={cn(
					"inline-block h-7 min-w-[3ch] text-center text-sm font-medium leading-7 tabular-nums transition-colors hover:text-hover-neutral",
					status === "bloodied" && "text-amber-400",
					status === "unconscious" && "text-red-400",
					status === "healthy" && "text-foreground",
					dimmed && "opacity-50",
				)}
			>
				{currentHp}
			</button>
			{popoverOpen && (
				<HpAdjustPopover
					onAdjust={onAdjust}
					onClose={() => setPopoverOpen(false)}
				/>
			)}
		</div>
	);
}

function AcDisplay({
	ac,
	onCommit,
}: {
	ac: number | undefined;
	onCommit: (value: number | undefined) => void;
}) {
	const [editing, setEditing] = useState(false);
	const [draft, setDraft] = useState(ac?.toString() ?? "");
	const inputRef = useRef<HTMLInputElement>(null);

	const commit = useCallback(() => {
		if (draft === "") {
			onCommit(undefined);
		} else {
			const n = Number.parseInt(draft, 10);
			if (!Number.isNaN(n) && n >= 0) {
				onCommit(n);
			}
		}
		setEditing(false);
	}, [draft, onCommit]);

	const startEditing = useCallback(() => {
		setDraft(ac?.toString() ?? "");
		setEditing(true);
		requestAnimationFrame(() => inputRef.current?.select());
	}, [ac]);

	if (editing) {
		return (
			<Input
				ref={inputRef}
				type="text"
				inputMode="numeric"
				value={draft}
				placeholder="AC"
				className="h-7 w-[6ch] text-center text-sm tabular-nums"
				onChange={(e) => setDraft(e.target.value)}
				onBlur={commit}
				onKeyDown={(e) => {
					if (e.key === "Enter") commit();
					if (e.key === "Escape") setEditing(false);
				}}
			/>
		);
	}

	return <AcShield value={ac} onClick={startEditing} />;
}

function InitiativeDisplay({
	initiative,
	combatantId,
	dimmed,
	onSetInitiative,
	onRollInitiative,
}: {
	initiative: number | undefined;
	combatantId: CombatantId;
	dimmed: boolean;
	onSetInitiative: (id: CombatantId, value: number | undefined) => void;
	onRollInitiative?: (id: CombatantId) => void;
}) {
	const [editing, setEditing] = useState(false);
	const [draft, setDraft] = useState(initiative?.toString() ?? "");
	const inputRef = useRef<HTMLInputElement>(null);

	const commit = useCallback(() => {
		if (draft === "") {
			onSetInitiative(combatantId, undefined);
		} else {
			const n = Number.parseInt(draft, 10);
			if (!Number.isNaN(n)) {
				onSetInitiative(combatantId, n);
			}
		}
		setEditing(false);
	}, [draft, combatantId, onSetInitiative]);

	const startEditing = useCallback(() => {
		setDraft(initiative?.toString() ?? "");
		setEditing(true);
		requestAnimationFrame(() => inputRef.current?.select());
	}, [initiative]);

	if (editing) {
		return (
			<Input
				ref={inputRef}
				type="text"
				inputMode="numeric"
				value={draft}
				placeholder="--"
				className={cn(
					"h-7 w-[6ch] text-center text-sm tabular-nums",
					dimmed && "opacity-50",
				)}
				onChange={(e) => setDraft(e.target.value)}
				onBlur={commit}
				onKeyDown={(e) => {
					if (e.key === "Enter") commit();
					if (e.key === "Escape") setEditing(false);
				}}
			/>
		);
	}

	// Empty + bestiary creature → d20 roll button
	if (initiative === undefined && onRollInitiative) {
		return (
			<button
				type="button"
				onClick={() => onRollInitiative(combatantId)}
				className={cn(
					"flex h-7 w-full items-center justify-center text-muted-foreground transition-colors hover:text-hover-neutral",
					dimmed && "opacity-50",
				)}
				title="Roll initiative"
				aria-label="Roll initiative"
			>
				<D20Icon className="h-7 w-7" />
			</button>
		);
	}

	// Has value → bold number, click to edit
	// Empty + manual → "--" placeholder, click to edit
	return (
		<button
			type="button"
			onClick={startEditing}
			className={cn(
				"h-7 w-full text-center text-sm leading-7 tabular-nums transition-colors",
				initiative !== undefined
					? "font-medium text-foreground hover:text-hover-neutral"
					: "text-muted-foreground hover:text-hover-neutral",
				dimmed && "opacity-50",
			)}
		>
			{initiative ?? "--"}
		</button>
	);
}

function rowBorderClass(
	isActive: boolean,
	isConcentrating: boolean | undefined,
): string {
	if (isActive) return "border-l-2 border-l-accent bg-accent/10";
	if (isConcentrating) return "border-l-2 border-l-purple-400";
	return "border-l-2 border-l-transparent";
}

function concentrationIconClass(
	isConcentrating: boolean | undefined,
	dimmed: boolean,
): string {
	if (!isConcentrating)
		return "opacity-0 group-hover:opacity-50 text-muted-foreground";
	return dimmed ? "opacity-50 text-purple-400" : "opacity-100 text-purple-400";
}

function activateOnKeyDown(
	handler: () => void,
): (e: { key: string; preventDefault: () => void }) => void {
	return (e) => {
		if (e.key === "Enter" || e.key === " ") {
			e.preventDefault();
			handler();
		}
	};
}

export function CombatantRow({
	ref,
	combatant,
	isActive,
	onRename,
	onSetInitiative,
	onRemove,
	onSetHp,
	onAdjustHp,
	onSetAc,
	onToggleCondition,
	onToggleConcentration,
	onShowStatBlock,
	onRollInitiative,
}: CombatantRowProps & { ref?: Ref<HTMLDivElement> }) {
	const { id, name, initiative, maxHp, currentHp } = combatant;
	const status = deriveHpStatus(currentHp, maxHp);
	const dimmed = status === "unconscious";
	const [pickerOpen, setPickerOpen] = useState(false);

	const prevHpRef = useRef(currentHp);
	const [isPulsing, setIsPulsing] = useState(false);
	const pulseTimerRef = useRef<ReturnType<typeof setTimeout>>(undefined);

	useEffect(() => {
		const prevHp = prevHpRef.current;
		prevHpRef.current = currentHp;

		if (
			prevHp !== undefined &&
			currentHp !== undefined &&
			currentHp < prevHp &&
			combatant.isConcentrating
		) {
			setIsPulsing(true);
			clearTimeout(pulseTimerRef.current);
			pulseTimerRef.current = setTimeout(() => setIsPulsing(false), 1200);
		}
	}, [currentHp, combatant.isConcentrating]);

	useEffect(() => {
		if (!combatant.isConcentrating) {
			clearTimeout(pulseTimerRef.current);
			setIsPulsing(false);
		}
	}, [combatant.isConcentrating]);

	return (
		/* biome-ignore lint/a11y/noStaticElementInteractions: role="button" is set conditionally when onShowStatBlock exists */
		<div
			ref={ref}
			role={onShowStatBlock ? "button" : undefined}
			tabIndex={onShowStatBlock ? 0 : undefined}
			className={cn(
				"group rounded-md pr-3 transition-colors",
				rowBorderClass(isActive, combatant.isConcentrating),
				isPulsing && "animate-concentration-pulse",
				onShowStatBlock && "cursor-pointer",
			)}
			onClick={onShowStatBlock}
			onKeyDown={
				onShowStatBlock ? activateOnKeyDown(onShowStatBlock) : undefined
			}
		>
			<div className="grid grid-cols-[2rem_3rem_1fr_auto_auto_2rem] items-center gap-3 py-2">
				{/* Concentration */}
				<button
					type="button"
					onClick={(e) => {
						e.stopPropagation();
						onToggleConcentration(id);
					}}
					title="Concentrating"
					aria-label="Toggle concentration"
					className={cn(
						"flex w-full items-center justify-center self-stretch -my-2 -ml-[2px] pl-[14px] transition-opacity hover:text-hover-neutral hover:opacity-100",
						concentrationIconClass(combatant.isConcentrating, dimmed),
					)}
				>
					<Brain size={16} />
				</button>

				{/* Initiative */}
				{/* biome-ignore lint/a11y/noStaticElementInteractions: stopPropagation wrapper for interactive children */}
				<div
					onClick={(e) => e.stopPropagation()}
					onKeyDown={(e) => e.stopPropagation()}
				>
					<InitiativeDisplay
						initiative={initiative}
						combatantId={id}
						dimmed={dimmed}
						onSetInitiative={onSetInitiative}
						onRollInitiative={onRollInitiative}
					/>
				</div>

				{/* Name + Conditions */}
				<div
					className={cn(
						"relative flex flex-wrap items-center gap-1 min-w-0",
						dimmed && "opacity-50",
					)}
				>
					<EditableName
						name={name}
						combatantId={id}
						onRename={onRename}
						onShowStatBlock={onShowStatBlock}
					/>
					<ConditionTags
						conditions={combatant.conditions}
						onRemove={(conditionId) => onToggleCondition(id, conditionId)}
						onOpenPicker={() => setPickerOpen((prev) => !prev)}
					/>
					{pickerOpen && (
						<ConditionPicker
							activeConditions={combatant.conditions}
							onToggle={(conditionId) => onToggleCondition(id, conditionId)}
							onClose={() => setPickerOpen(false)}
						/>
					)}
				</div>

				{/* AC */}
				{/* biome-ignore lint/a11y/noStaticElementInteractions: stopPropagation wrapper for interactive children */}
				<div
					className={cn(dimmed && "opacity-50")}
					onClick={(e) => e.stopPropagation()}
					onKeyDown={(e) => e.stopPropagation()}
				>
					<AcDisplay ac={combatant.ac} onCommit={(v) => onSetAc(id, v)} />
				</div>

				{/* HP */}
				{/* biome-ignore lint/a11y/noStaticElementInteractions: stopPropagation wrapper for interactive children */}
				<div
					className="flex items-center gap-1"
					onClick={(e) => e.stopPropagation()}
					onKeyDown={(e) => e.stopPropagation()}
				>
					<ClickableHp
						currentHp={currentHp}
						maxHp={maxHp}
						onAdjust={(delta) => onAdjustHp(id, delta)}
						dimmed={dimmed}
					/>
					{maxHp !== undefined && (
						<span
							className={cn(
								"text-sm tabular-nums text-muted-foreground",
								dimmed && "opacity-50",
							)}
						>
							/
						</span>
					)}
					<div className={cn(dimmed && "opacity-50")}>
						<MaxHpDisplay maxHp={maxHp} onCommit={(v) => onSetHp(id, v)} />
					</div>
				</div>

				{/* Actions */}
				<ConfirmButton
					icon={<X size={16} />}
					label="Remove combatant"
					onConfirm={() => onRemove(id)}
					className="h-7 w-7 text-muted-foreground opacity-0 pointer-events-none group-hover:opacity-100 group-hover:pointer-events-auto focus:opacity-100 focus:pointer-events-auto transition-opacity"
				/>
			</div>
		</div>
	);
}