"use client";

import {
	Check,
	ChevronsUpDown,
	FileText,
	FolderTree,
	Loader2,
	Package,
	Palette,
	Save,
	Settings,
	Trash2,
} from "lucide-react";
import { useEffect, useRef, useState } from "react";
import { deleteCatalogPage, updateCatalogPage } from "@/actions/catalog";
import { CatalogImagePicker } from "@/components/admin/catalog/catalog-image-picker";
import {
	CatalogIcon,
	LAYOUT_COLORS,
} from "@/components/admin/catalog/catalog-visuals";
import { IconPicker } from "@/components/admin/catalog/icon-picker";
import { ImagePreview } from "@/components/admin/catalog/image-preview";
import { useConfirmDialog } from "@/components/admin/confirm-dialog";
import Link from "@/components/link";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import {
	Command,
	CommandEmpty,
	CommandGroup,
	CommandInput,
	CommandItem,
	CommandList,
} from "@/components/ui/command";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
	Popover,
	PopoverContent,
	PopoverTrigger,
} from "@/components/ui/popover";
import {
	Select,
	SelectContent,
	SelectItem,
	SelectTrigger,
	SelectValue,
} from "@/components/ui/select";
import { Switch } from "@/components/ui/switch";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { Textarea } from "@/components/ui/textarea";
import { useServerAction } from "@/hooks/use-server-action";
import {
	CATALOG_LAYOUTS,
	type CatalogLayout,
	LAYOUT_DESCRIPTIONS,
} from "@/lib/catalog-layouts";
import { cn } from "@/lib/utils";

interface CatalogPageData {
	id: number;
	caption: string;
	parentId: number;
	pageLayout: string;
	enabled: string;
	visible: string;
	minRank: number;
	clubOnly: string;
	orderNum: number;
	iconImage: number;
	iconColor: number;
	pageHeadline: string;
	pageTeaser: string;
	pageSpecial: string | null;
	pageText1: string | null;
	pageText2: string | null;
	pageTextDetails: string | null;
	pageTextTeaser: string | null;
}

interface CatalogPageFormProps {
	catalogPage: CatalogPageData;
	childPages: { id: number; caption: string; enabled: string }[];
	canEdit: boolean;
	allPages: { id: number; caption: string }[];
}

export function CatalogPageForm({
	catalogPage,
	childPages,
	canEdit,
	allPages,
}: CatalogPageFormProps) {
	const { isPending, run } = useServerAction();
	const { confirm, dialog: confirmDialog } = useConfirmDialog();
	const formRef = useRef<HTMLFormElement>(null);

	const [form, setForm] = useState({
		caption: catalogPage.caption,
		parentId: catalogPage.parentId,
		pageLayout: catalogPage.pageLayout,
		enabled: catalogPage.enabled as "0" | "1",
		visible: catalogPage.visible as "0" | "1",
		minRank: catalogPage.minRank,
		clubOnly: catalogPage.clubOnly as "0" | "1",
		orderNum: catalogPage.orderNum,
		iconImage: catalogPage.iconImage,
		iconColor: catalogPage.iconColor,
		pageHeadline: catalogPage.pageHeadline,
		pageTeaser: catalogPage.pageTeaser,
		pageSpecial: catalogPage.pageSpecial || "",
		pageText1: catalogPage.pageText1 || "",
		pageText2: catalogPage.pageText2 || "",
		pageTextDetails: catalogPage.pageTextDetails || "",
		pageTextTeaser: catalogPage.pageTextTeaser || "",
	});

	// Ctrl+S / Cmd+S to save
	useEffect(() => {
		if (!canEdit) return;
		function onKeyDown(e: KeyboardEvent) {
			if ((e.metaKey || e.ctrlKey) && e.key === "s") {
				e.preventDefault();
				formRef.current?.requestSubmit();
			}
		}
		document.addEventListener("keydown", onKeyDown);
		return () => document.removeEventListener("keydown", onKeyDown);
	}, [canEdit]);

	function update<K extends keyof typeof form>(
		key: K,
		value: (typeof form)[K],
	) {
		setForm((prev) => ({ ...prev, [key]: value }));
	}

	function handleSubmit(e: React.FormEvent) {
		e.preventDefault();
		run(() => updateCatalogPage({ id: catalogPage.id, ...form }), {
			successMessage: "Page updated and catalog synced.",
			errorMessage: "Failed to update.",
		});
	}

	async function handleDelete() {
		const childCount = childPages.length;
		const description =
			childCount > 0
				? `Delete this catalog page? Its ${childCount} child page(s) will be moved to the parent. All items on this page will be deleted.`
				: "Delete this catalog page and all its items?";
		const ok = await confirm({
			title: "Delete catalog page",
			description,
			confirmLabel: "Delete",
		});
		if (!ok) return;
		run(() => deleteCatalogPage({ id: catalogPage.id }), {
			successMessage: "Page deleted.",
			redirectTo: "/ase/economy/catalog",
		});
	}

	const layoutColorClass =
		LAYOUT_COLORS[form.pageLayout] || "bg-muted text-muted-foreground";

	return (
		<>
			{confirmDialog}
			<form ref={formRef} onSubmit={handleSubmit}>
				<div className="grid gap-4 lg:grid-cols-3">
					{/* ── Left column (2/3): tabs ─────────────────────────── */}
					<div className="lg:col-span-2 space-y-4">
						<Card>
							<CardContent className="pt-4">
								<Tabs defaultValue="general">
									<TabsList className="mb-4">
										<TabsTrigger value="general" className="gap-2">
											<Settings className="h-4 w-4" />
											General
										</TabsTrigger>
										<TabsTrigger value="texts" className="gap-2">
											<FileText className="h-4 w-4" />
											Texts
										</TabsTrigger>
										<TabsTrigger value="appearance" className="gap-2">
											<Palette className="h-4 w-4" />
											Appearance
										</TabsTrigger>
									</TabsList>

									{/* ── General ──────────────────────────────────── */}
									<TabsContent value="general" className="space-y-4">
										<div className="grid gap-4 sm:grid-cols-2">
											<div className="space-y-2">
												<Label htmlFor="caption">Caption</Label>
												<Input
													id="caption"
													value={form.caption}
													onChange={(e) => update("caption", e.target.value)}
													disabled={!canEdit}
												/>
											</div>
											<div className="space-y-2">
												<Label>Parent Page</Label>
												<ParentCombobox
													value={form.parentId}
													onChange={(id) => update("parentId", id)}
													pages={allPages}
													currentPageId={catalogPage.id}
													disabled={!canEdit}
												/>
											</div>
										</div>

										<div className="space-y-2">
											<Label>Layout</Label>
											<LayoutSelect
												value={form.pageLayout}
												onChange={(v) => update("pageLayout", v)}
												disabled={!canEdit}
											/>
											<p className="text-xs text-muted-foreground">
												{LAYOUT_DESCRIPTIONS[
													form.pageLayout as CatalogLayout
												] ?? "Custom layout"}
											</p>
										</div>

										<div className="grid gap-4 sm:grid-cols-2">
											<div className="space-y-2">
												<Label htmlFor="orderNum">Order</Label>
												<Input
													id="orderNum"
													type="number"
													value={form.orderNum}
													onChange={(e) =>
														update(
															"orderNum",
															parseInt(e.target.value, 10) || 0,
														)
													}
													disabled={!canEdit}
												/>
											</div>
											<div className="space-y-2">
												<Label htmlFor="minRank">Min Rank</Label>
												<Input
													id="minRank"
													type="number"
													min={1}
													max={100}
													value={form.minRank}
													onChange={(e) =>
														update("minRank", parseInt(e.target.value, 10) || 1)
													}
													disabled={!canEdit}
												/>
											</div>
										</div>
									</TabsContent>

									{/* ── Texts ────────────────────────────────────── */}
									<TabsContent value="texts" className="space-y-4">
										<div className="space-y-1.5">
											<Label>Headline</Label>
											<CatalogImagePicker
												value={form.pageHeadline}
												onChange={(v) => update("pageHeadline", v)}
												type="header"
												label="Headline image"
												disabled={!canEdit}
											/>
											<ImagePreview value={form.pageHeadline} height={50} />
										</div>
										<div className="space-y-1.5">
											<Label>Teaser</Label>
											<CatalogImagePicker
												value={form.pageTeaser}
												onChange={(v) => update("pageTeaser", v)}
												type="teaser"
												label="Teaser image"
												disabled={!canEdit}
											/>
											<ImagePreview value={form.pageTeaser} height={50} />
										</div>
										<div className="grid gap-4 sm:grid-cols-2">
											<TextareaField
												id="pageText1"
												label="Text 1"
												value={form.pageText1}
												onChange={(v) => update("pageText1", v)}
												disabled={!canEdit}
												rows={4}
												max={5000}
											/>
											<TextareaField
												id="pageText2"
												label="Text 2"
												value={form.pageText2}
												onChange={(v) => update("pageText2", v)}
												disabled={!canEdit}
												rows={4}
												max={5000}
											/>
										</div>
										<div className="grid gap-4 sm:grid-cols-2">
											<TextareaField
												id="pageTextDetails"
												label="Details"
												value={form.pageTextDetails}
												onChange={(v) => update("pageTextDetails", v)}
												disabled={!canEdit}
												rows={3}
												max={5000}
											/>
											<TextareaField
												id="pageTextTeaser"
												label="Text Teaser"
												value={form.pageTextTeaser}
												onChange={(v) => update("pageTextTeaser", v)}
												disabled={!canEdit}
												rows={3}
												max={5000}
											/>
										</div>
										<TextareaField
											id="pageSpecial"
											label="Special"
											value={form.pageSpecial}
											onChange={(v) => update("pageSpecial", v)}
											disabled={!canEdit}
											rows={2}
											max={2048}
										/>
									</TabsContent>

									{/* ── Appearance ───────────────────────────────── */}
									<TabsContent value="appearance" className="space-y-4">
										<div className="space-y-2">
											<Label>Icon</Label>
											<div className="flex items-center gap-3">
												<IconPicker
													value={form.iconImage}
													onChange={(id) => update("iconImage", id)}
													disabled={!canEdit}
												/>
												<p className="text-xs text-muted-foreground">
													Icon shown in the catalog tree navigation.
												</p>
											</div>
										</div>
										<div className="space-y-2">
											<Label htmlFor="iconColor">Icon Color</Label>
											<div className="flex items-center gap-2">
												<Input
													id="iconColor"
													type="number"
													min={0}
													className="w-32"
													value={form.iconColor}
													onChange={(e) =>
														update(
															"iconColor",
															parseInt(e.target.value, 10) || 0,
														)
													}
													disabled={!canEdit}
												/>
												<p className="text-xs text-muted-foreground">
													Legacy tint value. Leave at default unless you need to
													match a specific theme.
												</p>
											</div>
										</div>
									</TabsContent>
								</Tabs>
							</CardContent>
						</Card>

						{/* Child pages list */}
						{childPages.length > 0 && (
							<Card>
								<CardHeader className="pb-3">
									<CardTitle className="text-base flex items-center gap-2">
										<FolderTree className="h-4 w-4" />
										Child Pages ({childPages.length})
									</CardTitle>
								</CardHeader>
								<CardContent>
									<div className="space-y-1">
										{childPages.map((child) => (
											<Link
												key={child.id}
												href={`/ase/economy/catalog/${child.id}`}
												className="flex items-center justify-between rounded-md px-3 py-2 hover:bg-accent text-sm"
											>
												<span>
													{child.caption}
													<span className="ml-2 text-muted-foreground font-mono text-xs">
														#{child.id}
													</span>
												</span>
												<Badge
													variant={
														child.enabled === "1" ? "default" : "outline"
													}
												>
													{child.enabled === "1" ? "Enabled" : "Disabled"}
												</Badge>
											</Link>
										))}
									</div>
								</CardContent>
							</Card>
						)}
					</div>

					{/* ── Right column (1/3): status sticky ────────────────── */}
					<div className="lg:col-span-1">
						<Card className="lg:sticky lg:top-4">
							<CardHeader className="pb-3">
								<CardTitle className="text-base">Status & Preview</CardTitle>
							</CardHeader>
							<CardContent className="space-y-4">
								{/* Preview */}
								<div className="flex items-center gap-3 rounded-md border bg-muted/30 p-3">
									<div className="flex h-12 w-12 items-center justify-center rounded bg-background shrink-0">
										<CatalogIcon iconImage={form.iconImage} size={36} />
									</div>
									<div className="min-w-0">
										<p className="truncate text-sm font-medium">
											{form.caption || "Untitled"}
										</p>
										<Badge
											className={cn(
												"mt-1 h-5 px-1.5 text-[10px] font-mono border-0",
												layoutColorClass,
											)}
										>
											{form.pageLayout}
										</Badge>
									</div>
								</div>

								{/* Toggles */}
								<div className="space-y-3">
									<ToggleRow
										id="tg-enabled"
										label="Enabled"
										description="Active in the catalog"
										checked={form.enabled === "1"}
										onChange={(v) => update("enabled", v ? "1" : "0")}
										disabled={!canEdit}
									/>
									<ToggleRow
										id="tg-visible"
										label="Visible"
										description="Shown in navigation"
										checked={form.visible === "1"}
										onChange={(v) => update("visible", v ? "1" : "0")}
										disabled={!canEdit}
									/>
									<ToggleRow
										id="tg-club"
										label="Club Only"
										description="Requires HC subscription"
										checked={form.clubOnly === "1"}
										onChange={(v) => update("clubOnly", v ? "1" : "0")}
										disabled={!canEdit}
									/>
								</div>

								{/* Stats */}
								<div className="flex items-center gap-4 border-t pt-3 text-xs text-muted-foreground">
									<span className="flex items-center gap-1">
										<FolderTree className="h-3.5 w-3.5" />
										{childPages.length} sub
									</span>
									<span className="flex items-center gap-1">
										<Package className="h-3.5 w-3.5" />#{catalogPage.id}
									</span>
								</div>

								{/* Actions */}
								{canEdit && (
									<div className="space-y-2 border-t pt-3">
										<Button
											type="submit"
											disabled={isPending}
											className="w-full"
										>
											{isPending ? (
												<Loader2 className="mr-2 h-4 w-4 animate-spin" />
											) : (
												<Save className="mr-2 h-4 w-4" />
											)}
											Save & Sync
										</Button>
										<Button
											type="button"
											variant="destructive"
											onClick={handleDelete}
											disabled={isPending}
											className="w-full"
										>
											<Trash2 className="mr-2 h-4 w-4" />
											Delete Page
										</Button>
										<p className="text-center text-[10px] text-muted-foreground">
											Press <kbd className="rounded border px-1">Ctrl+S</kbd> to
											save
										</p>
									</div>
								)}
							</CardContent>
						</Card>
					</div>
				</div>
			</form>
		</>
	);
}

// ── Toggle row ─────────────────────────────────────────────────

function ToggleRow({
	id,
	label,
	description,
	checked,
	onChange,
	disabled,
}: {
	id: string;
	label: string;
	description: string;
	checked: boolean;
	onChange: (v: boolean) => void;
	disabled?: boolean;
}) {
	return (
		<div className="flex items-start justify-between gap-3">
			<div className="min-w-0 flex-1">
				<Label htmlFor={id} className="text-sm font-medium cursor-pointer">
					{label}
				</Label>
				<p className="text-[11px] text-muted-foreground">{description}</p>
			</div>
			<Switch
				id={id}
				checked={checked}
				onCheckedChange={onChange}
				disabled={disabled}
			/>
		</div>
	);
}

function TextareaField({
	id,
	label,
	value,
	onChange,
	disabled,
	rows = 3,
	max,
}: {
	id: string;
	label: string;
	value: string;
	onChange: (v: string) => void;
	disabled?: boolean;
	rows?: number;
	max?: number;
}) {
	return (
		<div className="space-y-2">
			<div className="flex items-center justify-between">
				<Label htmlFor={id}>{label}</Label>
				{max && (
					<span className="text-[10px] tabular-nums text-muted-foreground">
						{value.length}/{max}
					</span>
				)}
			</div>
			<Textarea
				id={id}
				rows={rows}
				value={value}
				onChange={(e) => onChange(e.target.value)}
				disabled={disabled}
				maxLength={max}
			/>
		</div>
	);
}

// ── Layout select with color swatch ────────────────────────────

function LayoutSelect({
	value,
	onChange,
	disabled,
}: {
	value: string;
	onChange: (v: string) => void;
	disabled?: boolean;
}) {
	return (
		<Select value={value} onValueChange={onChange} disabled={disabled}>
			<SelectTrigger>
				<SelectValue />
			</SelectTrigger>
			<SelectContent>
				{CATALOG_LAYOUTS.map((layout) => {
					const colorClass =
						LAYOUT_COLORS[layout] || "bg-muted text-muted-foreground";
					return (
						<SelectItem key={layout} value={layout}>
							<span className="flex items-center gap-2">
								<span
									className={cn(
										"inline-block h-2 w-2 rounded-full",
										colorClass,
									)}
								/>
								{layout}
							</span>
						</SelectItem>
					);
				})}
			</SelectContent>
		</Select>
	);
}

// ── Parent page combobox with search ────────────────────────────

function ParentCombobox({
	value,
	onChange,
	pages,
	currentPageId,
	disabled,
}: {
	value: number;
	onChange: (id: number) => void;
	pages: { id: number; caption: string }[];
	currentPageId: number;
	disabled?: boolean;
}) {
	const [open, setOpen] = useState(false);

	const options = pages.filter((p) => p.id !== currentPageId);
	const selected =
		value === -1
			? { id: -1, caption: "Root" }
			: pages.find((p) => p.id === value);

	return (
		<Popover open={open} onOpenChange={setOpen}>
			<PopoverTrigger asChild>
				<Button
					type="button"
					variant="outline"
					role="combobox"
					aria-expanded={open}
					disabled={disabled}
					className="w-full justify-between font-normal"
				>
					{selected ? (
						<span className="truncate">
							<span className="text-muted-foreground font-mono text-xs mr-1.5">
								{selected.id === -1 ? "—" : `#${selected.id}`}
							</span>
							{selected.caption}
						</span>
					) : (
						<span className="text-muted-foreground">Select parent...</span>
					)}
					<ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
				</Button>
			</PopoverTrigger>
			<PopoverContent
				className="w-[--radix-popover-trigger-width] p-0"
				align="start"
			>
				<Command>
					<CommandInput placeholder="Search pages..." />
					<CommandList>
						<CommandEmpty>No page found.</CommandEmpty>
						<CommandGroup>
							<CommandItem
								value="root"
								onSelect={() => {
									onChange(-1);
									setOpen(false);
								}}
							>
								<Check
									className={cn(
										"mr-2 h-4 w-4",
										value === -1 ? "opacity-100" : "opacity-0",
									)}
								/>
								<span className="text-muted-foreground font-mono text-xs mr-1.5">
									—
								</span>
								Root
							</CommandItem>
							{options.map((page) => (
								<CommandItem
									key={page.id}
									value={`${page.id} ${page.caption}`}
									onSelect={() => {
										onChange(page.id);
										setOpen(false);
									}}
								>
									<Check
										className={cn(
											"mr-2 h-4 w-4",
											value === page.id ? "opacity-100" : "opacity-0",
										)}
									/>
									<span className="text-muted-foreground font-mono text-xs mr-1.5">
										#{page.id}
									</span>
									<span className="truncate">{page.caption}</span>
								</CommandItem>
							))}
						</CommandGroup>
					</CommandList>
				</Command>
			</PopoverContent>
		</Popover>
	);
}