import type { Creature } from "@initiative/domain";
import { useCallback, useEffect, useRef, useState } from "react";
import { ActionBar } from "./components/action-bar";
import { CombatantRow } from "./components/combatant-row";
import { StatBlockPanel } from "./components/stat-block-panel";
import { TurnNavigation } from "./components/turn-navigation";
import { useBestiary } from "./hooks/use-bestiary";
import { useEncounter } from "./hooks/use-encounter";

export function App() {
	const {
		encounter,
		advanceTurn,
		retreatTurn,
		addCombatant,
		removeCombatant,
		editCombatant,
		setInitiative,
		setHp,
		adjustHp,
		setAc,
		toggleCondition,
		toggleConcentration,
		addFromBestiary,
	} = useEncounter();

	const { search, getCreature, isLoaded } = useBestiary();

	const [selectedCreature, setSelectedCreature] = useState<Creature | null>(
		null,
	);
	const [suggestions, setSuggestions] = useState<Creature[]>([]);

	const handleAddFromBestiary = useCallback(
		(creature: Creature) => {
			addFromBestiary(creature);
			setSelectedCreature(creature);
		},
		[addFromBestiary],
	);

	const handleShowStatBlock = useCallback((creature: Creature) => {
		setSelectedCreature(creature);
	}, []);

	const handleCombatantStatBlock = useCallback(
		(creatureId: string) => {
			const creature = getCreature(
				creatureId as import("@initiative/domain").CreatureId,
			);
			if (creature) setSelectedCreature(creature);
		},
		[getCreature],
	);

	const handleSearchChange = useCallback(
		(query: string) => {
			if (!isLoaded || query.length < 2) {
				setSuggestions([]);
				return;
			}
			setSuggestions(search(query));
		},
		[isLoaded, search],
	);

	// Auto-scroll to the active combatant when the turn changes
	const activeRowRef = useRef<HTMLDivElement>(null);
	useEffect(() => {
		activeRowRef.current?.scrollIntoView({
			block: "nearest",
			behavior: "smooth",
		});
	}, [encounter.activeIndex]);

	// Auto-show stat block for the active combatant when turn changes,
	// but only when the viewport is wide enough to show it alongside the tracker
	useEffect(() => {
		if (!window.matchMedia("(min-width: 1024px)").matches) return;
		const active = encounter.combatants[encounter.activeIndex];
		if (!active?.creatureId || !isLoaded) return;
		const creature = getCreature(
			active.creatureId as import("@initiative/domain").CreatureId,
		);
		if (creature) setSelectedCreature(creature);
	}, [encounter.activeIndex, encounter.combatants, getCreature, isLoaded]);

	return (
		<div className="flex h-screen flex-col">
			<div className="mx-auto flex w-full max-w-2xl flex-1 flex-col gap-6 px-4 min-h-0">
				{/* Turn Navigation — fixed at top */}
				<div className="shrink-0 pt-8">
					<TurnNavigation
						encounter={encounter}
						onAdvanceTurn={advanceTurn}
						onRetreatTurn={retreatTurn}
					/>
				</div>

				{/* Scrollable area — combatant list */}
				<div className="flex-1 overflow-y-auto min-h-0">
					<header className="space-y-1 mb-6">
						<h1 className="text-2xl font-bold tracking-tight">
							Initiative Tracker
						</h1>
					</header>

					<div className="flex flex-col gap-1 pb-2">
						{encounter.combatants.length === 0 ? (
							<p className="py-12 text-center text-sm text-muted-foreground">
								No combatants yet — add one to get started
							</p>
						) : (
							encounter.combatants.map((c, i) => (
								<CombatantRow
									key={c.id}
									ref={i === encounter.activeIndex ? activeRowRef : null}
									combatant={c}
									isActive={i === encounter.activeIndex}
									onRename={editCombatant}
									onSetInitiative={setInitiative}
									onRemove={removeCombatant}
									onSetHp={setHp}
									onAdjustHp={adjustHp}
									onSetAc={setAc}
									onToggleCondition={toggleCondition}
									onToggleConcentration={toggleConcentration}
									onShowStatBlock={
										c.creatureId
											? () => handleCombatantStatBlock(c.creatureId as string)
											: undefined
									}
								/>
							))
						)}
					</div>
				</div>

				{/* Action Bar — fixed at bottom */}
				<div className="shrink-0 pb-8">
					<ActionBar
						onAddCombatant={addCombatant}
						onAddFromBestiary={handleAddFromBestiary}
						bestiarySearch={search}
						bestiaryLoaded={isLoaded}
						suggestions={suggestions}
						onSearchChange={handleSearchChange}
						onShowStatBlock={handleShowStatBlock}
					/>
				</div>
			</div>

			{/* Stat Block Panel */}
			<StatBlockPanel
				creature={selectedCreature}
				onClose={() => setSelectedCreature(null)}
			/>
		</div>
	);
}