"use client";

import {
	DEFAULT_STACK,
	PRESET_TEMPLATES,
	type StackState,
	TECH_OPTIONS,
} from "@/lib/constant";
import {
	Check,
	Circle,
	CircleCheck,
	ClipboardCopy,
	HelpCircle,
	InfoIcon,
	RefreshCw,
	Settings,
	Star,
	Terminal,
} from "lucide-react";
import { motion } from "motion/react";
import { useCallback, useEffect, useMemo, useRef, useState } from "react";

const validateProjectName = (name: string): string | undefined => {
	const INVALID_CHARS = ["<", ">", ":", '"', "|", "?", "*"];
	const MAX_LENGTH = 255;

	if (name === ".") return undefined;

	if (!name) return "Project name cannot be empty";
	if (name.length > MAX_LENGTH) {
		return `Project name must be less than ${MAX_LENGTH} characters`;
	}
	if (INVALID_CHARS.some((char) => name.includes(char))) {
		return "Project name contains invalid characters";
	}
	if (name.startsWith(".") || name.startsWith("-")) {
		return "Project name cannot start with a dot or dash";
	}
	if (
		name.toLowerCase() === "node_modules" ||
		name.toLowerCase() === "favicon.ico"
	) {
		return "Project name is reserved";
	}
	return undefined;
};

const CATEGORY_ORDER: Array<keyof typeof TECH_OPTIONS> = [
	"frontend",
	"runtime",
	"backendFramework",
	"api",
	"database",
	"orm",
	"dbSetup",
	"auth",
	"packageManager",
	"addons",
	"examples",
	"git",
	"install",
];

const hasWebFrontend = (frontend: string[]) =>
	frontend.some((f) =>
		["tanstack-router", "react-router", "tanstack-start", "next"].includes(f),
	);

const hasPWACompatibleFrontend = (frontend: string[]) =>
	frontend.some((f) => ["tanstack-router", "react-router"].includes(f));

const hasNativeFrontend = (frontend: string[]) => frontend.includes("native");

const StackArchitect = () => {
	const [stack, setStack] = useState<StackState>(DEFAULT_STACK);
	const [command, setCommand] = useState("");
	const [copied, setCopied] = useState(false);
	const [compatNotes, setCompatNotes] = useState<
		Record<string, { notes: string[]; hasIssue: boolean }>
	>({});
	const [projectNameError, setProjectNameError] = useState<string | undefined>(
		undefined,
	);
	const [showPresets, setShowPresets] = useState(false);
	const [showHelp, setShowHelp] = useState(false);
	const [lastSavedStack, setLastSavedStack] = useState<StackState | null>(null);
	const [activeCategory, setActiveCategory] = useState<string | null>(
		CATEGORY_ORDER[0],
	);

	const sectionRefs = useRef<Record<string, HTMLElement | null>>({});
	const contentRef = useRef<HTMLDivElement>(null);

	const currentHasWebFrontend = useMemo(
		() => hasWebFrontend(stack.frontend),
		[stack.frontend],
	);
	const currentHasPWACompatibleFrontend = useMemo(
		() => hasPWACompatibleFrontend(stack.frontend),
		[stack.frontend],
	);
	const currentHasNativeFrontend = useMemo(
		() => hasNativeFrontend(stack.frontend),
		[stack.frontend],
	);

	useEffect(() => {
		const savedStack = localStorage.getItem("betterTStackPreference");
		if (savedStack) {
			try {
				const parsedStack = JSON.parse(savedStack) as StackState;
				setLastSavedStack(parsedStack);
			} catch (e) {
				console.error("Failed to parse saved stack", e);
				localStorage.removeItem("betterTStackPreference");
			}
		}
	}, []);

	// biome-ignore lint/correctness/useExhaustiveDependencies: Dependencies are logically required for validation inside updater
	useEffect(() => {
		setStack((currentStack) => {
			const nextStack = { ...currentStack };
			let changed = false;

			const isWeb = hasWebFrontend(nextStack.frontend);
			const isPWACompat = hasPWACompatibleFrontend(nextStack.frontend);
			const isNative = hasNativeFrontend(nextStack.frontend);

			if (nextStack.database === "none") {
				if (nextStack.orm !== "none") {
					nextStack.orm = "none";
					changed = true;
				}
				if (nextStack.auth === "true") {
					nextStack.auth = "false";
					changed = true;
				}
				if (nextStack.dbSetup !== "none") {
					nextStack.dbSetup = "none";
					changed = true;
				}
			} else if (nextStack.database === "mongodb") {
				if (nextStack.orm !== "prisma") {
					nextStack.orm = "prisma";
					changed = true;
				}
			}

			if (nextStack.dbSetup === "turso") {
				if (nextStack.database !== "sqlite") {
					nextStack.database = "sqlite";
					changed = true;
				}
				if (nextStack.orm !== "drizzle") {
					nextStack.orm = "drizzle";
					changed = true;
				}
			} else if (nextStack.dbSetup === "prisma-postgres") {
				if (nextStack.database !== "postgres") {
					nextStack.database = "postgres";
					changed = true;
				}
				if (nextStack.orm !== "prisma") {
					nextStack.orm = "prisma";
					changed = true;
				}
			} else if (nextStack.dbSetup === "mongodb-atlas") {
				if (nextStack.database !== "mongodb") {
					nextStack.database = "mongodb";
					changed = true;
				}
				if (nextStack.orm !== "prisma") {
					nextStack.orm = "prisma";
					changed = true;
				}
			} else if (nextStack.dbSetup === "neon") {
				if (nextStack.database !== "postgres") {
					nextStack.database = "postgres";
					changed = true;
				}
			}

			if (isNative && nextStack.api !== "trpc") {
				nextStack.api = "trpc";
				changed = true;
			}

			const incompatibleAddons: string[] = [];
			if (!isPWACompat) {
				incompatibleAddons.push("pwa", "tauri");
			}
			const originalAddonsLength = nextStack.addons.length;
			nextStack.addons = nextStack.addons.filter(
				(addon) => !incompatibleAddons.includes(addon),
			);
			if (nextStack.addons.length !== originalAddonsLength) {
				changed = true;
			}
			if (
				nextStack.addons.includes("husky") &&
				!nextStack.addons.includes("biome")
			) {
				nextStack.addons.push("biome");
				nextStack.addons = [...new Set(nextStack.addons)];
				changed = true;
			}

			const incompatibleExamples: string[] = [];
			if (!isWeb) {
				incompatibleExamples.push("todo", "ai");
			}
			if (nextStack.database === "none") {
				incompatibleExamples.push("todo");
			}
			if (nextStack.backendFramework === "elysia") {
				incompatibleExamples.push("ai");
			}

			const originalExamplesLength = nextStack.examples.length;
			nextStack.examples = nextStack.examples.filter(
				(ex) => !incompatibleExamples.includes(ex),
			);
			if (nextStack.examples.length !== originalExamplesLength) {
				changed = true;
			}

			return changed ? nextStack : currentStack;
		});
	}, [
		stack.database,
		stack.orm,
		stack.auth,
		stack.dbSetup,
		stack.frontend,
		stack.api,
		stack.addons,
		stack.examples,
		stack.backendFramework,
	]);

	const generateCommand = useCallback((stackState: StackState) => {
		let base: string;
		switch (stackState.packageManager) {
			case "npm":
				base = "npx create-better-t-stack@latest";
				break;
			case "pnpm":
				base = "pnpm create better-t-stack@latest";
				break;
			default:
				base = "bun create better-t-stack@latest";
				break;
		}

		const projectName = stackState.projectName || "my-better-t-app";
		const flags: string[] = [];

		const isDefault = <K extends keyof StackState>(
			key: K,
			value: StackState[K],
		) => {
			const defaultValue = DEFAULT_STACK[key];

			if (Array.isArray(defaultValue) && Array.isArray(value)) {
				return (
					defaultValue.length === value.length &&
					defaultValue.every((item) => value.includes(item)) &&
					value.every((item) => defaultValue.includes(item))
				);
			}
			return defaultValue === value;
		};

		if (!isDefault("frontend", stackState.frontend)) {
			if (
				stackState.frontend.length === 0 ||
				stackState.frontend[0] === "none"
			) {
				flags.push("--frontend none");
			} else {
				flags.push(`--frontend ${stackState.frontend.join(" ")}`);
			}
		}

		if (!isDefault("database", stackState.database)) {
			flags.push(`--database ${stackState.database}`);
		}

		if (stackState.database !== "none" && !isDefault("orm", stackState.orm)) {
			flags.push(`--orm ${stackState.orm}`);
		}

		if (!isDefault("auth", stackState.auth)) {
			if (stackState.auth === "false") {
				flags.push("--no-auth");
			}
		}

		if (!isDefault("dbSetup", stackState.dbSetup)) {
			flags.push(`--db-setup ${stackState.dbSetup}`);
		}

		if (!isDefault("backendFramework", stackState.backendFramework)) {
			flags.push(`--backend ${stackState.backendFramework}`);
		}

		if (!isDefault("runtime", stackState.runtime)) {
			flags.push(`--runtime ${stackState.runtime}`);
		}

		if (!isDefault("api", stackState.api)) {
			flags.push(`--api ${stackState.api}`);
		}

		if (!isDefault("packageManager", stackState.packageManager)) {
			flags.push(`--package-manager ${stackState.packageManager}`);
		}

		if (!isDefault("git", stackState.git)) {
			if (stackState.git === "false") {
				flags.push("--no-git");
			}
		}

		if (!isDefault("install", stackState.install)) {
			if (stackState.install === "false") {
				flags.push("--no-install");
			}
		}

		if (!isDefault("addons", stackState.addons)) {
			if (stackState.addons.length > 0) {
				flags.push(`--addons ${stackState.addons.join(" ")}`);
			}
		}

		if (!isDefault("examples", stackState.examples)) {
			if (stackState.examples.length > 0) {
				flags.push(`--examples ${stackState.examples.join(" ")}`);
			}
		}

		return `${base} ${projectName}${flags.length > 0 ? ` ${flags.join(" ")}` : ""}`;
	}, []);

	useEffect(() => {
		const cmd = generateCommand(stack);
		setCommand(cmd);

		const notes: Record<string, { notes: string[]; hasIssue: boolean }> = {};
		for (const cat of CATEGORY_ORDER) {
			notes[cat] = { notes: [], hasIssue: false };
		}

		const isWeb = currentHasWebFrontend;
		const isPWACompat = currentHasPWACompatibleFrontend;
		const isNative = currentHasNativeFrontend;

		if (isNative && stack.frontend.length > 1) {
			notes.frontend.notes.push(
				"React Native requires the tRPC API when used with other frontends. oRPC will be disabled.",
			);
			if (stack.api !== "trpc") notes.frontend.hasIssue = true;
		}
		if (
			!isPWACompat &&
			stack.addons.some((a) => ["pwa", "tauri"].includes(a))
		) {
			notes.frontend.notes.push(
				"PWA/Tauri addons require TanStack or React Router.",
			);
			notes.frontend.hasIssue = true;
			notes.addons.hasIssue = true;
		}
		if (!isWeb && stack.examples.length > 0) {
			notes.frontend.notes.push("Examples require a web frontend.");
			notes.frontend.hasIssue = true;
			notes.examples.hasIssue = true;
		}

		if (isNative && stack.api !== "trpc") {
			notes.api.notes.push(
				"React Native requires tRPC. It will be selected automatically.",
			);
			notes.api.hasIssue = true;
		}

		if (stack.database === "mongodb" && stack.orm !== "prisma") {
			notes.database.notes.push(
				"MongoDB requires Prisma ORM. It will be selected automatically.",
			);
			notes.database.hasIssue = true;
			notes.orm.hasIssue = true;
		}
		if (stack.database === "none") {
			if (stack.orm !== "none") notes.database.hasIssue = true;
			if (stack.auth === "true") notes.database.hasIssue = true;
			if (stack.dbSetup !== "none") notes.database.hasIssue = true;
			if (stack.examples.includes("todo")) notes.database.hasIssue = true;
		}

		if (stack.database === "none" && stack.orm !== "none") {
			notes.orm.notes.push(
				"ORM requires a database. It will be set to 'None'.",
			);
			notes.orm.hasIssue = true;
		}
		if (stack.database === "mongodb" && stack.orm !== "prisma") {
			notes.orm.notes.push("MongoDB requires Prisma ORM. It will be selected.");
			notes.orm.hasIssue = true;
		}
		if (stack.dbSetup === "turso" && stack.orm !== "drizzle") {
			notes.orm.notes.push(
				"Turso DB setup requires Drizzle ORM. It will be selected.",
			);
			notes.orm.hasIssue = true;
		}
		if (stack.dbSetup === "prisma-postgres" && stack.orm !== "prisma") {
			notes.orm.notes.push(
				"Prisma PostgreSQL setup requires Prisma ORM. It will be selected.",
			);
			notes.orm.hasIssue = true;
		}
		if (stack.dbSetup === "mongodb-atlas" && stack.orm !== "prisma") {
			notes.orm.notes.push(
				"MongoDB Atlas setup requires Prisma ORM. It will be selected.",
			);
			notes.orm.hasIssue = true;
		}

		if (stack.database === "none" && stack.dbSetup !== "none") {
			notes.dbSetup.notes.push(
				"DB Setup requires a database. It will be set to 'Basic Setup'.",
			);
			notes.dbSetup.hasIssue = true;
		} else if (stack.dbSetup !== "none") {
			const db = stack.database;
			const orm = stack.orm;
			if (stack.dbSetup === "turso" && (db !== "sqlite" || orm !== "drizzle")) {
				notes.dbSetup.notes.push(
					"Turso requires SQLite & Drizzle. They will be selected.",
				);
				notes.dbSetup.hasIssue = true;
				if (db !== "sqlite") notes.database.hasIssue = true;
				if (orm !== "drizzle") notes.orm.hasIssue = true;
			} else if (
				stack.dbSetup === "prisma-postgres" &&
				(db !== "postgres" || orm !== "prisma")
			) {
				notes.dbSetup.notes.push(
					"Requires PostgreSQL & Prisma. They will be selected.",
				);
				notes.dbSetup.hasIssue = true;
				if (db !== "postgres") notes.database.hasIssue = true;
				if (orm !== "prisma") notes.orm.hasIssue = true;
			} else if (
				stack.dbSetup === "mongodb-atlas" &&
				(db !== "mongodb" || orm !== "prisma")
			) {
				notes.dbSetup.notes.push(
					"Requires MongoDB & Prisma. They will be selected.",
				);
				notes.dbSetup.hasIssue = true;
				if (db !== "mongodb") notes.database.hasIssue = true;
				if (orm !== "prisma") notes.orm.hasIssue = true;
			} else if (stack.dbSetup === "neon" && db !== "postgres") {
				notes.dbSetup.notes.push(
					"Neon requires PostgreSQL. It will be selected.",
				);
				notes.dbSetup.hasIssue = true;
				if (db !== "postgres") notes.database.hasIssue = true;
			}
		}

		if (stack.database === "none" && stack.auth === "true") {
			notes.auth.notes.push(
				"Authentication requires a database. It will be disabled.",
			);
			notes.auth.hasIssue = true;
		}

		if (
			!isPWACompat &&
			stack.addons.some((a) => ["pwa", "tauri"].includes(a))
		) {
			notes.addons.notes.push(
				"PWA/Tauri require TanStack/React Router. They will be removed.",
			);
			notes.addons.hasIssue = true;
		}
		if (stack.addons.includes("husky") && !stack.addons.includes("biome")) {
			notes.addons.notes.push(
				"Husky automatically enables Biome. It will be added.",
			);
		}

		if (!isWeb && stack.examples.length > 0) {
			notes.examples.notes.push(
				"Examples require a web frontend. They will be removed.",
			);
			notes.examples.hasIssue = true;
		}
		if (stack.database === "none" && stack.examples.includes("todo")) {
			notes.examples.notes.push(
				"Todo example requires a database. It will be removed.",
			);
			notes.examples.hasIssue = true;
		}
		if (stack.backendFramework === "elysia" && stack.examples.includes("ai")) {
			notes.examples.notes.push(
				"AI example is not compatible with Elysia. It will be removed.",
			);
			notes.examples.hasIssue = true;
			notes.backendFramework.hasIssue = true;
		}

		setCompatNotes(notes);
	}, [
		stack,
		generateCommand,
		currentHasWebFrontend,
		currentHasPWACompatibleFrontend,
		currentHasNativeFrontend,
	]);

	const handleTechSelect = useCallback(
		(category: keyof typeof TECH_OPTIONS, techId: string) => {
			setStack((prev) => {
				const currentStack = { ...prev };
				const catKey = category as keyof StackState;

				if (
					catKey === "frontend" ||
					catKey === "addons" ||
					catKey === "examples"
				) {
					const currentArray = [...(currentStack[catKey] as string[])];
					let nextArray = [...currentArray];
					const isSelected = currentArray.includes(techId);

					if (catKey === "frontend") {
						const webTypes = [
							"tanstack-router",
							"react-router",
							"tanstack-start",
							"next",
						];
						if (techId === "none") {
							nextArray = ["none"];
						} else if (isSelected) {
							nextArray = nextArray.filter((id) => id !== techId);
							if (nextArray.length === 0) {
								return prev;
							}
						} else {
							nextArray = nextArray.filter((id) => id !== "none");
							if (webTypes.includes(techId)) {
								nextArray = nextArray.filter((id) => !webTypes.includes(id));
							}
							nextArray.push(techId);
						}
					} else {
						if (isSelected) {
							nextArray = nextArray.filter((id) => id !== techId);
						} else {
							nextArray.push(techId);
						}
					}
					return { ...currentStack, [catKey]: [...new Set(nextArray)] };
				}

				if (currentStack[catKey] === techId) {
					return prev;
				}
				return { ...currentStack, [catKey]: techId };
			});
		},
		[],
	);

	const getDisabledReason = useCallback(
		(category: keyof typeof TECH_OPTIONS, techId: string): string | null => {
			const catKey = category as keyof StackState;

			if (catKey === "api" && techId !== "trpc" && currentHasNativeFrontend) {
				return "Only tRPC API is supported with React Native.";
			}

			if (catKey === "orm") {
				if (stack.database === "none")
					return "Select a database to enable ORM options.";
				if (stack.database === "mongodb" && techId === "drizzle")
					return "MongoDB requires the Prisma ORM.";
				if (stack.dbSetup === "turso" && techId === "prisma")
					return "Turso DB setup requires the Drizzle ORM.";
			}

			if (catKey === "dbSetup" && techId !== "none") {
				if (stack.database === "none")
					return "Select a database before choosing a cloud setup.";

				if (techId === "turso") {
					if (stack.database !== "sqlite")
						return "Turso requires SQLite database.";
					if (stack.orm === "prisma") return "Turso requires Drizzle ORM.";
				} else if (techId === "prisma-postgres") {
					if (stack.database !== "postgres")
						return "Requires PostgreSQL database.";
					if (stack.orm !== "prisma") return "Requires Prisma ORM.";
				} else if (techId === "mongodb-atlas") {
					if (stack.database !== "mongodb") return "Requires MongoDB database.";
					if (stack.orm !== "prisma") return "Requires Prisma ORM.";
				} else if (techId === "neon") {
					if (stack.database !== "postgres")
						return "Requires PostgreSQL database.";
				}
			}

			if (catKey === "auth" && techId === "true" && stack.database === "none") {
				return "Authentication requires a database.";
			}

			if (catKey === "addons") {
				if (
					(techId === "pwa" || techId === "tauri") &&
					!currentHasPWACompatibleFrontend
				) {
					return "Requires TanStack Router or React Router frontend.";
				}
			}

			if (catKey === "examples") {
				if ((techId === "todo" || techId === "ai") && !currentHasWebFrontend) {
					return "Requires a web frontend (TanStack Router, React Router, etc.).";
				}
				if (techId === "todo" && stack.database === "none") {
					return "Todo example requires a database.";
				}
				if (techId === "ai" && stack.backendFramework === "elysia") {
					return "AI example is not compatible with Elysia backend.";
				}
			}

			return null;
		},
		[
			stack.database,
			stack.orm,
			stack.dbSetup,
			stack.backendFramework,
			currentHasNativeFrontend,
			currentHasPWACompatibleFrontend,
			currentHasWebFrontend,
		],
	);

	const copyToClipboard = useCallback(() => {
		navigator.clipboard.writeText(command);
		setCopied(true);
		setTimeout(() => setCopied(false), 2000);
	}, [command]);

	const resetStack = useCallback(() => {
		setStack(DEFAULT_STACK);
		setProjectNameError(validateProjectName(DEFAULT_STACK.projectName || ""));
		setShowHelp(false);
		setShowPresets(false);
		setActiveCategory(CATEGORY_ORDER[0]);
		contentRef.current?.scrollTo(0, 0);
	}, []);

	useEffect(() => {
		setProjectNameError(validateProjectName(stack.projectName || ""));
	}, [stack.projectName]);

	const saveCurrentStack = useCallback(() => {
		localStorage.setItem("betterTStackPreference", JSON.stringify(stack));
		setLastSavedStack(stack);
	}, [stack]);

	const loadSavedStack = useCallback(() => {
		if (lastSavedStack) {
			setStack(lastSavedStack);
			setProjectNameError(
				validateProjectName(lastSavedStack.projectName || ""),
			);
			setShowHelp(false);
			setShowPresets(false);
			setActiveCategory(CATEGORY_ORDER[0]);
			contentRef.current?.scrollTo(0, 0);
		}
	}, [lastSavedStack]);

	const applyPreset = useCallback((presetId: string) => {
		const preset = PRESET_TEMPLATES.find(
			(template) => template.id === presetId,
		);
		if (preset) {
			setStack(preset.stack);
			setProjectNameError(validateProjectName(preset.stack.projectName || ""));
			setShowPresets(false);
			setShowHelp(false);
			setActiveCategory(CATEGORY_ORDER[0]);
			contentRef.current?.scrollTo(0, 0);
		}
	}, []);

	const handleSidebarClick = (category: string) => {
		setActiveCategory(category);
		const element = sectionRefs.current[category];
		if (element) {
			element.scrollIntoView({ behavior: "smooth", block: "start" });
		}
	};

	const getCategoryDisplayName = (categoryKey: string): string => {
		const result = categoryKey.replace(/([A-Z])/g, " $1");
		return result.charAt(0).toUpperCase() + result.slice(1);
	};

	return (
		<div className="flex h-screen flex-col overflow-hidden border-gray-300 bg-gray-100 text-gray-800 shadow-xl dark:border-gray-700 dark:bg-gray-900 dark:text-white">
			<div className="flex flex-shrink-0 items-center justify-between border-gray-300 border-b bg-gray-200 px-2 py-2 sm:px-4 dark:border-gray-700 dark:bg-gray-800">
				<div className="flex space-x-2">
					<div className="h-3 w-3 rounded-full bg-red-500" />
					<div className="h-3 w-3 rounded-full bg-yellow-500" />
					<div className="h-3 w-3 rounded-full bg-green-500" />
				</div>
				<div className="hidden font-mono text-gray-600 text-xs sm:block dark:text-gray-400">
					Stack Architect Terminal
				</div>
				<div className="flex space-x-2">
					<button
						type="button"
						onClick={() => setShowHelp(!showHelp)}
						className="text-gray-600 transition-colors hover:text-gray-800 dark:text-gray-400 dark:hover:text-white"
						title="Help"
					>
						<HelpCircle className="h-4 w-4" />
					</button>
					<button
						type="button"
						onClick={() => setShowPresets(!showPresets)}
						className="text-gray-600 transition-colors hover:text-gray-800 dark:text-gray-400 dark:hover:text-white"
						title="Presets"
					>
						<Star className="h-4 w-4" />
					</button>
				</div>
			</div>

			{showHelp && (
				<div className="flex-shrink-0 border-gray-300 border-b bg-blue-50 p-3 sm:p-4 dark:border-gray-700 dark:bg-blue-900/20">
					<h3 className="mb-2 font-medium text-blue-800 text-sm dark:text-blue-300">
						How to Use Stack Architect
					</h3>
					<ul className="list-disc space-y-1 pl-5 text-blue-700 text-xs dark:text-blue-400">
						<li>Use the sidebar to navigate between configuration sections.</li>
						<li>Select your preferred technologies in the main area.</li>
						<li>
							Some selections may disable or automatically change other options
							based on compatibility (check notes within each section!).
						</li>
						<li>
							The command below updates automatically based on your selections.
						</li>
						<li>
							Click the copy button (
							<ClipboardCopy className="inline h-3 w-3" />) next to the command
							to copy it.
						</li>
						<li>
							Use presets (<Star className="inline h-3 w-3" />) for quick setup
							or reset (<RefreshCw className="inline h-3 w-3" />) to defaults.
						</li>
						<li>
							Save (<Star className="inline h-3 w-3" />) your preferences to
							load (<Settings className="inline h-3 w-3" />) them later.
						</li>
					</ul>
				</div>
			)}

			{showPresets && (
				<div className="flex-shrink-0 border-gray-300 border-b bg-amber-50 p-3 sm:p-4 dark:border-gray-700 dark:bg-amber-900/20">
					<h3 className="mb-2 font-medium text-amber-800 text-sm dark:text-amber-300">
						Quick Start Presets
					</h3>
					<div className="grid grid-cols-1 gap-2 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4">
						{PRESET_TEMPLATES.map((preset) => (
							<button
								type="button"
								key={preset.id}
								onClick={() => applyPreset(preset.id)}
								className="rounded border border-amber-200 p-2 text-left transition-colors hover:bg-amber-100 dark:border-amber-700 dark:hover:bg-amber-800/30"
							>
								<div className="font-medium text-amber-700 text-sm dark:text-amber-300">
									{preset.name}
								</div>
								<div className="text-amber-600 text-xs dark:text-amber-400">
									{preset.description}
								</div>
							</button>
						))}
					</div>
				</div>
			)}

			<div className="flex-shrink-0 p-3 font-mono sm:p-4">
				<div className="mb-3 flex flex-col justify-between gap-y-3 sm:flex-row sm:items-start">
					<label className="flex flex-col">
						<span className="mb-1 text-gray-600 text-xs dark:text-gray-400">
							Project Name:
						</span>
						<input
							type="text"
							value={stack.projectName || ""}
							onChange={(e) => {
								const newValue = e.target.value;
								setStack((prev) => ({ ...prev, projectName: newValue }));
								setProjectNameError(validateProjectName(newValue));
							}}
							className={`w-full rounded border px-2 py-1 font-mono text-sm focus:outline-none sm:w-auto ${
								projectNameError
									? "border-red-500 bg-red-50 dark:border-red-500 dark:bg-red-900/20"
									: "border-gray-300 bg-gray-200 focus:border-blue-500 dark:border-gray-700 dark:bg-gray-800 dark:focus:border-blue-400"
							}`}
							placeholder="my-better-t-app"
						/>
						{projectNameError && (
							<p className="mt-1 text-red-500 text-xs">{projectNameError}</p>
						)}
					</label>
					<div className="flex flex-wrap gap-2">
						<button
							type="button"
							onClick={resetStack}
							className="flex items-center gap-1 rounded border border-gray-300 bg-gray-200 px-2 py-1 text-gray-700 text-xs transition-colors hover:bg-gray-300 dark:border-gray-700 dark:bg-gray-800 dark:text-gray-300 dark:hover:bg-gray-700"
							title="Reset to defaults"
						>
							<RefreshCw className="h-3 w-3" />
							Reset
						</button>
						{lastSavedStack && (
							<button
								type="button"
								onClick={loadSavedStack}
								className="flex items-center gap-1 rounded border border-blue-300 bg-blue-100 px-2 py-1 text-blue-700 text-xs transition-colors hover:bg-blue-200 dark:border-blue-700 dark:bg-blue-900/50 dark:text-blue-300 dark:hover:bg-blue-800/50"
								title="Load saved preferences"
							>
								<Settings className="h-3 w-3" />
								Load Saved
							</button>
						)}
						<button
							id="save-stack-button"
							type="button"
							onClick={saveCurrentStack}
							className="flex items-center gap-1 rounded border border-green-300 bg-green-100 px-2 py-1 text-green-700 text-xs transition-colors hover:bg-green-200 dark:border-green-700 dark:bg-green-900/50 dark:text-green-300 dark:hover:bg-green-800/50"
							title="Save current preferences"
						>
							<Star className="h-3 w-3" />
							<span>Save</span>
						</button>
					</div>
				</div>

				<div className="relative mb-4 overflow-hidden rounded border border-gray-300 bg-gray-200 p-2 dark:border-gray-700 dark:bg-gray-800">
					<div className="flex overflow-x-auto pr-10">
						<span className="mr-2 select-none text-green-600 dark:text-green-400">
							$
						</span>
						<code className="whitespace-pre break-words text-gray-700 text-xs sm:text-sm dark:text-gray-300">
							{command}
						</code>
					</div>
					<button
						type="button"
						onClick={copyToClipboard}
						className="absolute top-1 right-1 rounded p-1 text-gray-500 transition-colors hover:bg-gray-300 hover:text-gray-700 dark:text-gray-400 dark:hover:bg-gray-700 dark:hover:text-gray-200"
						title={copied ? "Copied!" : "Copy command"}
					>
						{copied ? (
							<Check className="h-4 w-4 text-green-500" />
						) : (
							<ClipboardCopy className="h-4 w-4" />
						)}
					</button>
				</div>

				<div className="mb-4">
					<h3 className="mb-2 font-semibold text-gray-600 text-sm dark:text-gray-400">
						Selected Stack Summary
					</h3>
					<div className="flex flex-wrap gap-1.5">
						{CATEGORY_ORDER.flatMap((category) => {
							const categoryKey = category as keyof StackState;
							const options =
								TECH_OPTIONS[category as keyof typeof TECH_OPTIONS];
							const selectedValue = stack[categoryKey];

							if (!options) return [];

							if (Array.isArray(selectedValue)) {
								if (selectedValue.length === 0 || selectedValue[0] === "none")
									return [];

								return selectedValue
									.map((id) => options.find((opt) => opt.id === id))
									.filter((tech): tech is NonNullable<typeof tech> =>
										Boolean(tech),
									)
									.map((tech) => (
										<span
											key={`${category}-${tech.id}`}
											className={`inline-flex items-center gap-1 rounded-full border px-2 py-0.5 text-xs ${getBadgeColors(category)}`}
										>
											{tech.icon} {tech.name}
										</span>
									));
							}
							const tech = options.find((opt) => opt.id === selectedValue);

							if (
								!tech ||
								tech.id === "none" ||
								tech.id === "false" ||
								((category === "git" ||
									category === "install" ||
									category === "auth") &&
									tech.id === "true")
							) {
								return [];
							}

							return (
								<span
									key={`${category}-${tech.id}`}
									className={`inline-flex items-center gap-1 rounded-full border px-2 py-0.5 text-xs ${getBadgeColors(category)}`}
								>
									{tech.icon} {tech.name}
								</span>
							);
						})}
					</div>
				</div>
			</div>

			<div className="flex flex-grow overflow-hidden">
				<nav className="w-48 flex-shrink-0 overflow-y-auto border-gray-300 border-r bg-gray-200/50 p-2 dark:border-gray-700 dark:bg-gray-800/50">
					<ul className="space-y-1">
						{CATEGORY_ORDER.map((category) => (
							<li key={category}>
								<button
									type="button"
									onClick={() => handleSidebarClick(category)}
									className={`flex w-full items-center justify-between rounded px-2 py-1.5 text-left font-mono text-xs transition-colors ${
										activeCategory === category
											? "bg-blue-100 text-blue-700 dark:bg-blue-900/50 dark:text-blue-300"
											: "text-gray-600 hover:bg-gray-300/50 dark:text-gray-400 dark:hover:bg-gray-700/50"
									}`}
								>
									<span>{getCategoryDisplayName(category)}</span>
									{compatNotes[category]?.hasIssue && (
										<span title="Compatibility issue affects this section">
											<InfoIcon className="h-3 w-3 flex-shrink-0 text-orange-500 dark:text-orange-400" />
										</span>
									)}
								</button>
							</li>
						))}
					</ul>
				</nav>

				<main
					ref={contentRef}
					className="flex-grow overflow-y-auto scroll-smooth p-4"
				>
					{CATEGORY_ORDER.map((categoryKey) => {
						const categoryOptions =
							TECH_OPTIONS[categoryKey as keyof typeof TECH_OPTIONS] || [];
						const categoryDisplayName = getCategoryDisplayName(categoryKey);
						const notesInfo = compatNotes[categoryKey];

						return (
							<section
								ref={(el) => {
									sectionRefs.current[categoryKey] = el;
								}}
								key={categoryKey}
								id={`section-${categoryKey}`}
								className="mb-8 scroll-mt-4"
							>
								<div className="mb-3 flex items-center border-gray-300 border-b pb-2 text-gray-700 dark:border-gray-700 dark:text-gray-300">
									<Terminal className="mr-2 h-5 w-5 flex-shrink-0" />
									<h2 className="font-semibold text-base">
										{categoryDisplayName}
									</h2>
								</div>

								{notesInfo?.notes && notesInfo.notes.length > 0 && (
									<div
										className={`mb-4 rounded-md border p-3 ${notesInfo.hasIssue ? "border-orange-200 bg-orange-50 dark:border-orange-800 dark:bg-orange-900/20" : "border-blue-200 bg-blue-50 dark:border-blue-800 dark:bg-blue-900/20"}`}
									>
										<div
											className={`mb-1 flex items-center gap-2 font-medium text-xs sm:text-sm ${notesInfo.hasIssue ? "text-orange-800 dark:text-orange-300" : "text-blue-800 dark:text-blue-300"}`}
										>
											<InfoIcon className="h-4 w-4 flex-shrink-0" />
											<span>
												{notesInfo.hasIssue
													? "Compatibility Issues / Auto-Adjustments"
													: "Notes"}
											</span>
										</div>
										<ul
											className={`list-inside list-disc space-y-1 text-xs ${notesInfo.hasIssue ? "text-orange-700 dark:text-orange-400" : "text-blue-700 dark:text-blue-400"}`}
										>
											{notesInfo.notes.map((note, index) => (
												// biome-ignore lint/suspicious/noArrayIndexKey: Static notes per render
												<li key={index}>{note}</li>
											))}
										</ul>
									</div>
								)}

								<div className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4">
									{categoryOptions.map((tech) => {
										let isSelected = false;
										const category = categoryKey as keyof StackState;

										if (
											category === "addons" ||
											category === "examples" ||
											category === "frontend"
										) {
											isSelected = (
												(stack[category] as string[]) || []
											).includes(tech.id);
										} else {
											isSelected = stack[category] === tech.id;
										}

										const disabledReason = getDisabledReason(
											categoryKey as keyof typeof TECH_OPTIONS,
											tech.id,
										);
										const isDisabled = !!disabledReason;

										return (
											<motion.div
												key={tech.id}
												className={`relative rounded border p-3 transition-all ${
													isDisabled
														? "cursor-not-allowed opacity-60"
														: "cursor-pointer"
												} ${
													isSelected
														? "border-blue-400 bg-blue-100 ring-1 ring-blue-300 dark:border-blue-600 dark:bg-blue-900/40 dark:ring-blue-700"
														: `border-gray-300 dark:border-gray-700 ${!isDisabled ? "hover:border-gray-400 hover:bg-gray-200/50 dark:hover:border-gray-600 dark:hover:bg-gray-800/50" : ""}`
												}`}
												title={
													isDisabled
														? (disabledReason ?? "Option disabled")
														: tech.description
												}
												whileHover={!isDisabled ? { scale: 1.02 } : undefined}
												whileTap={!isDisabled ? { scale: 0.98 } : undefined}
												onClick={() =>
													!isDisabled &&
													handleTechSelect(
														categoryKey as keyof typeof TECH_OPTIONS,
														tech.id,
													)
												}
											>
												<div className="flex items-start">
													<div className="mt-1 mr-3 flex-shrink-0">
														{isSelected ? (
															<CircleCheck className="h-5 w-5 text-blue-600 dark:text-blue-400" />
														) : (
															<Circle className="h-5 w-5 text-gray-400 dark:text-gray-600" />
														)}
													</div>
													<div className="flex-grow">
														<div className="flex items-center justify-between">
															<div className="flex items-center">
																<span className="mr-2 text-lg">
																	{tech.icon}
																</span>
																<span
																	className={`font-medium ${
																		isSelected
																			? "text-blue-800 dark:text-blue-300"
																			: "text-gray-800 dark:text-gray-200"
																	} text-sm`}
																>
																	{tech.name}
																</span>
															</div>
														</div>
														<p className="mt-1 text-gray-600 text-xs dark:text-gray-400">
															{tech.description}
														</p>
													</div>
												</div>
												{tech.default && !isSelected && !isDisabled && (
													<span className="absolute top-1 right-1 ml-2 flex-shrink-0 rounded bg-gray-300 px-1 py-0.5 text-[10px] text-gray-600 dark:bg-gray-700 dark:text-gray-400">
														Default
													</span>
												)}
											</motion.div>
										);
									})}
								</div>
							</section>
						);
					})}

					<div className="h-10" />
				</main>
			</div>
		</div>
	);
};

const getBadgeColors = (category: string): string => {
	switch (category) {
		case "frontend":
			return "border-blue-300 bg-blue-100 text-blue-800 dark:border-blue-700/30 dark:bg-blue-900/30 dark:text-blue-300";
		case "runtime":
			return "border-amber-300 bg-amber-100 text-amber-800 dark:border-amber-700/30 dark:bg-amber-900/30 dark:text-amber-300";
		case "backendFramework":
			return "border-sky-300 bg-sky-100 text-sky-800 dark:border-sky-700/30 dark:bg-sky-900/30 dark:text-sky-300";
		case "api":
			return "border-indigo-300 bg-indigo-100 text-indigo-800 dark:border-indigo-700/30 dark:bg-indigo-900/30 dark:text-indigo-300";
		case "database":
			return "border-emerald-300 bg-emerald-100 text-emerald-800 dark:border-emerald-700/30 dark:bg-emerald-900/30 dark:text-emerald-300";
		case "orm":
			return "border-cyan-300 bg-cyan-100 text-cyan-800 dark:border-cyan-700/30 dark:bg-cyan-900/30 dark:text-cyan-300";
		case "auth":
			return "border-green-300 bg-green-100 text-green-800 dark:border-green-700/30 dark:bg-green-900/30 dark:text-green-300";
		case "dbSetup":
			return "border-pink-300 bg-pink-100 text-pink-800 dark:border-pink-700/30 dark:bg-pink-900/30 dark:text-pink-300";
		case "addons":
			return "border-violet-300 bg-violet-100 text-violet-800 dark:border-violet-700/30 dark:bg-violet-900/30 dark:text-violet-300";
		case "examples":
			return "border-teal-300 bg-teal-100 text-teal-800 dark:border-teal-700/30 dark:bg-teal-900/30 dark:text-teal-300";
		case "packageManager":
			return "border-orange-300 bg-orange-100 text-orange-800 dark:border-orange-700/30 dark:bg-orange-900/30 dark:text-orange-300";
		case "git":
		case "install":
			return "border-gray-300 bg-gray-100 text-gray-700 dark:border-gray-600 dark:bg-gray-800 dark:text-gray-400";
		default:
			return "border-gray-300 bg-gray-100 text-gray-800 dark:border-gray-700/30 dark:bg-gray-900/30 dark:text-gray-300";
	}
};

export default StackArchitect;