import {
	type Creature,
	calculateInitiative,
	formatInitiativeModifier,
} from "@initiative/domain";

interface StatBlockProps {
	creature: Creature;
}

function abilityMod(score: number): string {
	const mod = Math.floor((score - 10) / 2);
	return mod >= 0 ? `+${mod}` : `${mod}`;
}

function PropertyLine({
	label,
	value,
}: Readonly<{
	label: string;
	value: string | undefined;
}>) {
	if (!value) return null;
	return (
		<div className="text-sm">
			<span className="font-semibold">{label}</span> {value}
		</div>
	);
}

function SectionDivider() {
	return (
		<div className="my-2 h-px bg-gradient-to-r from-amber-800/60 via-amber-700/40 to-transparent" />
	);
}

export function StatBlock({ creature }: Readonly<StatBlockProps>) {
	const abilities = [
		{ label: "STR", score: creature.abilities.str },
		{ label: "DEX", score: creature.abilities.dex },
		{ label: "CON", score: creature.abilities.con },
		{ label: "INT", score: creature.abilities.int },
		{ label: "WIS", score: creature.abilities.wis },
		{ label: "CHA", score: creature.abilities.cha },
	];

	const initiative = calculateInitiative({
		dexScore: creature.abilities.dex,
		cr: creature.cr,
		initiativeProficiency: creature.initiativeProficiency,
	});

	return (
		<div className="space-y-1 text-foreground">
			{/* Header */}
			<div>
				<h2 className="font-bold text-amber-400 text-xl">{creature.name}</h2>
				<p className="text-muted-foreground text-sm italic">
					{creature.size} {creature.type}, {creature.alignment}
				</p>
				<p className="text-muted-foreground text-xs">
					{creature.sourceDisplayName}
				</p>
			</div>

			<SectionDivider />

			{/* Stats bar */}
			<div className="space-y-0.5 text-sm">
				<div>
					<span className="font-semibold">Armor Class</span> {creature.ac}
					{!!creature.acSource && (
						<span className="text-muted-foreground">
							{" "}
							({creature.acSource})
						</span>
					)}
					<span className="ml-3">
						<span className="font-semibold">Initiative</span>{" "}
						{formatInitiativeModifier(initiative.modifier)} (
						{initiative.passive})
					</span>
				</div>
				<div>
					<span className="font-semibold">Hit Points</span>{" "}
					{creature.hp.average}{" "}
					<span className="text-muted-foreground">({creature.hp.formula})</span>
				</div>
				<div>
					<span className="font-semibold">Speed</span> {creature.speed}
				</div>
			</div>

			<SectionDivider />

			{/* Ability scores */}
			<div className="grid grid-cols-6 gap-1 text-center text-sm">
				{abilities.map(({ label, score }) => (
					<div key={label}>
						<div className="font-semibold">{label}</div>
						<div>
							{score}{" "}
							<span className="text-muted-foreground">
								({abilityMod(score)})
							</span>
						</div>
					</div>
				))}
			</div>

			<SectionDivider />

			{/* Properties */}
			<div className="space-y-0.5">
				<PropertyLine label="Saving Throws" value={creature.savingThrows} />
				<PropertyLine label="Skills" value={creature.skills} />
				<PropertyLine
					label="Damage Vulnerabilities"
					value={creature.vulnerable}
				/>
				<PropertyLine label="Damage Resistances" value={creature.resist} />
				<PropertyLine label="Damage Immunities" value={creature.immune} />
				<PropertyLine
					label="Condition Immunities"
					value={creature.conditionImmune}
				/>
				<PropertyLine label="Senses" value={creature.senses} />
				<PropertyLine label="Languages" value={creature.languages} />
				<div className="text-sm">
					<span className="font-semibold">Challenge</span> {creature.cr}{" "}
					<span className="text-muted-foreground">
						(Proficiency Bonus +{creature.proficiencyBonus})
					</span>
				</div>
			</div>

			{/* Traits */}
			{creature.traits && creature.traits.length > 0 && (
				<>
					<SectionDivider />
					<div className="space-y-2">
						{creature.traits.map((t) => (
							<div key={t.name} className="text-sm">
								<span className="font-semibold italic">{t.name}.</span> {t.text}
							</div>
						))}
					</div>
				</>
			)}

			{/* Spellcasting */}
			{creature.spellcasting && creature.spellcasting.length > 0 && (
				<>
					<SectionDivider />
					{creature.spellcasting.map((sc) => (
						<div key={sc.name} className="space-y-1 text-sm">
							<div>
								<span className="font-semibold italic">{sc.name}.</span>{" "}
								{sc.headerText}
							</div>
							{sc.atWill && sc.atWill.length > 0 && (
								<div className="pl-2">
									<span className="font-semibold">At Will:</span>{" "}
									{sc.atWill.join(", ")}
								</div>
							)}
							{sc.daily?.map((d) => (
								<div key={`${d.uses}${d.each ? "e" : ""}`} className="pl-2">
									<span className="font-semibold">
										{d.uses}/day
										{d.each ? " each" : ""}:
									</span>{" "}
									{d.spells.join(", ")}
								</div>
							))}
							{sc.restLong?.map((d) => (
								<div
									key={`rest-${d.uses}${d.each ? "e" : ""}`}
									className="pl-2"
								>
									<span className="font-semibold">
										{d.uses}/long rest
										{d.each ? " each" : ""}:
									</span>{" "}
									{d.spells.join(", ")}
								</div>
							))}
						</div>
					))}
				</>
			)}

			{/* Actions */}
			{creature.actions && creature.actions.length > 0 && (
				<>
					<SectionDivider />
					<h3 className="font-bold text-amber-400 text-base">Actions</h3>
					<div className="space-y-2">
						{creature.actions.map((a) => (
							<div key={a.name} className="text-sm">
								<span className="font-semibold italic">{a.name}.</span> {a.text}
							</div>
						))}
					</div>
				</>
			)}

			{/* Bonus Actions */}
			{creature.bonusActions && creature.bonusActions.length > 0 && (
				<>
					<SectionDivider />
					<h3 className="font-bold text-amber-400 text-base">Bonus Actions</h3>
					<div className="space-y-2">
						{creature.bonusActions.map((a) => (
							<div key={a.name} className="text-sm">
								<span className="font-semibold italic">{a.name}.</span> {a.text}
							</div>
						))}
					</div>
				</>
			)}

			{/* Reactions */}
			{creature.reactions && creature.reactions.length > 0 && (
				<>
					<SectionDivider />
					<h3 className="font-bold text-amber-400 text-base">Reactions</h3>
					<div className="space-y-2">
						{creature.reactions.map((a) => (
							<div key={a.name} className="text-sm">
								<span className="font-semibold italic">{a.name}.</span> {a.text}
							</div>
						))}
					</div>
				</>
			)}

			{/* Legendary Actions */}
			{!!creature.legendaryActions && (
				<>
					<SectionDivider />
					<h3 className="font-bold text-amber-400 text-base">
						Legendary Actions
					</h3>
					<p className="text-muted-foreground text-sm italic">
						{creature.legendaryActions.preamble}
					</p>
					<div className="space-y-2">
						{creature.legendaryActions.entries.map((a) => (
							<div key={a.name} className="text-sm">
								<span className="font-semibold italic">{a.name}.</span> {a.text}
							</div>
						))}
					</div>
				</>
			)}
		</div>
	);
}