import { useState, useEffect, useCallback } from "react";
import { AxiosError } from "axios";

import {
	getDepartmentsApi,
	createDepartmentApi,
	updateDepartmentApi,
	deleteDepartmentApi,
} from "@/api/department";

import {
	Table,
	TableBody,
	TableCell,
	TableHead,
	TableHeader,
	TableRow,
} from "@/components/ui/table";

import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";

import {
	Dialog,
	DialogContent,
	DialogHeader,
	DialogTitle,
	DialogFooter,
} from "@/components/ui/dialog";

import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";

import { Loader2, RefreshCw, Plus, Pencil, Trash, Eye } from "lucide-react";

interface Department {
	departmentId: string;
	name: string;
	para1: string;
	para2: string;
	para3: string;
	facilities: string;
	services: string;
}

export default function DepartmentPage() {
	const [departments, setDepartments] = useState<Department[]>([]);
	const [loading, setLoading] = useState(true);
	const [error, setError] = useState("");

	const [openModal, setOpenModal] = useState(false);
	const [editing, setEditing] = useState<Department | null>(null);

	const [viewOpen, setViewOpen] = useState(false);
	const [viewData, setViewData] = useState<Department | null>(null);

	const [searchText, setSearchText] = useState("");

	const [form, setForm] = useState<Department>({
		departmentId: "",
		name: "",
		para1: "",
		para2: "",
		para3: "",
		facilities: "",
		services: "",
	});

	const fetchDepartments = useCallback(async () => {
		setLoading(true);
		setError("");

		try {
			const res = await getDepartmentsApi();
			setDepartments(res?.data || []);
		} catch (err) {
			if (err instanceof AxiosError) {
				setError(err.response?.data?.message || "Failed to load departments");
			} else {
				setError("Something went wrong");
			}
		} finally {
			setLoading(false);
		}
	}, []);

	useEffect(() => {
		fetchDepartments();
	}, [fetchDepartments]);

	const filteredDepartments = departments.filter((dep) =>
		dep.name.toLowerCase().includes(searchText.toLowerCase()),
	);

	function handleChange(e: any) {
		setForm({ ...form, [e.target.name]: e.target.value });
	}

	function truncate(text: string, limit = 60) {
		if (!text) return "-";
		return text.length > limit ? text.substring(0, limit) + "..." : text;
	}

	function openAdd() {
		setEditing(null);
		setForm({
			departmentId: "",
			name: "",
			para1: "",
			para2: "",
			para3: "",
			facilities: "",
			services: "",
		});
		setOpenModal(true);
	}

	function openEdit(dep: Department) {
		setEditing(dep);
		setForm(dep);
		setOpenModal(true);
	}

	function openView(dep: Department) {
		setViewData(dep);
		setViewOpen(true);
	}

	async function handleSubmit() {
		try {
			if (editing) {
				const { departmentId, ...updateData } = form;
				await updateDepartmentApi(editing.departmentId, updateData);
			} else {
				await createDepartmentApi(form);
			}

			setOpenModal(false);
			fetchDepartments();
		} catch (error) {
			console.error(error);
		}
	}

	async function handleDelete(id: string) {
		if (!confirm("Delete this department?")) return;

		try {
			await deleteDepartmentApi(id);
			fetchDepartments();
		} catch (error) {
			console.error(error);
		}
	}

	return (
		<div className="p-6 space-y-6">
			<div className="flex flex-col md:flex-row md:justify-between md:items-center gap-3">
				<h1 className="text-2xl font-bold">Departments</h1>

				<div className="flex flex-wrap gap-3">
					<Input
						placeholder="Search department..."
						value={searchText}
						onChange={(e) => setSearchText(e.target.value)}
						className="w-[220px]"
					/>

					<Button
						variant="outline"
						onClick={fetchDepartments}
						disabled={loading}>
						<RefreshCw className="mr-2 h-4 w-4" />
						Refresh
					</Button>

					<Button onClick={openAdd}>
						<Plus className="mr-2 h-4 w-4" />
						Add Department
					</Button>
				</div>
			</div>

			{error && (
				<div className="p-4 text-red-600 bg-red-50 border rounded-md">
					{error}
				</div>
			)}

			<Card>
				<CardHeader>
					<CardTitle>Department List</CardTitle>
				</CardHeader>

				<CardContent>
					<div className="border rounded-md max-h-[500px] overflow-y-auto">
						<Table className="w-full table-fixed">
							<TableHeader>
								<TableRow>
									<TableHead className="w-[80px]">ID</TableHead>
									<TableHead className="w-[180px]">Name</TableHead>
									<TableHead className="w-[250px]">Para1</TableHead>
									<TableHead className="w-[220px]">Facilities</TableHead>
									<TableHead className="w-[220px]">Services</TableHead>
									<TableHead className="w-[120px]">Actions</TableHead>
								</TableRow>
							</TableHeader>

							<TableBody>
								{loading ? (
									<TableRow>
										<TableCell colSpan={6} className="text-center">
											<Loader2 className="h-6 w-6 animate-spin mx-auto" />
										</TableCell>
									</TableRow>
								) : filteredDepartments.length === 0 ? (
									<TableRow>
										<TableCell colSpan={6} className="text-center">
											No departments found
										</TableCell>
									</TableRow>
								) : (
									filteredDepartments.map((dep) => (
										<TableRow key={dep.departmentId}>
											<TableCell>{dep.departmentId}</TableCell>

											<TableCell>
												<div className="break-words">{dep.name}</div>
											</TableCell>

											<TableCell>
												<div className="break-words whitespace-normal">
													{truncate(dep.para1)}
												</div>
											</TableCell>

											<TableCell>
												<div className="break-words whitespace-normal">
													{truncate(dep.facilities)}
												</div>
											</TableCell>

											<TableCell>
												<div className="break-words whitespace-normal">
													{truncate(dep.services)}
												</div>
											</TableCell>

											<TableCell className="flex gap-2 whitespace-nowrap">
												<Button
													size="sm"
													variant="outline"
													onClick={() => openView(dep)}>
													<Eye className="h-4 w-4" />
												</Button>

												<Button
													size="sm"
													variant="outline"
													onClick={() => openEdit(dep)}>
													<Pencil className="h-4 w-4" />
												</Button>

												<Button
													size="sm"
													variant="destructive"
													onClick={() => handleDelete(dep.departmentId)}>
													<Trash className="h-4 w-4" />
												</Button>
											</TableCell>
										</TableRow>
									))
								)}
							</TableBody>
						</Table>
					</div>
				</CardContent>
			</Card>

			<Dialog open={openModal} onOpenChange={setOpenModal}>
				<DialogContent className="w-full !max-w-5xl max-h-[90vh] overflow-y-auto">
					<DialogHeader>
						<DialogTitle>
							{editing ? "Edit Department" : "Add Department"}
						</DialogTitle>
					</DialogHeader>

					<div className="space-y-4">
						<Input
							name="departmentId"
							value={form.departmentId}
							onChange={handleChange}
							disabled={!!editing}
							placeholder="Department ID"
						/>

						<Input
							name="name"
							value={form.name}
							onChange={handleChange}
							placeholder="Department Name"
						/>

						<Textarea
							name="para1"
							value={form.para1}
							onChange={handleChange}
							placeholder="Para1"
						/>
						<Textarea
							name="para2"
							value={form.para2}
							onChange={handleChange}
							placeholder="Para2"
						/>
						<Textarea
							name="para3"
							value={form.para3}
							onChange={handleChange}
							placeholder="Para3"
						/>
						<Textarea
							name="facilities"
							value={form.facilities}
							onChange={handleChange}
							placeholder="Facilities"
						/>
						<Textarea
							name="services"
							value={form.services}
							onChange={handleChange}
							placeholder="Services"
						/>
					</div>

					<DialogFooter>
						<Button variant="outline" onClick={() => setOpenModal(false)}>
							Cancel
						</Button>
						<Button onClick={handleSubmit}>
							{editing ? "Update" : "Create"}
						</Button>
					</DialogFooter>
				</DialogContent>
			</Dialog>

			<Dialog open={viewOpen} onOpenChange={setViewOpen}>
				<DialogContent className="w-full !max-w-5xl max-h-[90vh] overflow-y-auto">
					{" "}
					<DialogHeader>
						<DialogTitle>Department Details</DialogTitle>
					</DialogHeader>
					{viewData && (
						<div className="space-y-4 text-sm">
							<p>
								<b>ID:</b> {viewData.departmentId}
							</p>

							<p>
								<b>Name:</b> {viewData.name}
							</p>

							<p>
								<b>Para1:</b>
								<br />
								{viewData.para1}
							</p>

							<p>
								<b>Para2:</b>
								<br />
								{viewData.para2}
							</p>

							<p>
								<b>Para3:</b>
								<br />
								{viewData.para3}
							</p>

							<p>
								<b>Facilities:</b>
								<br />
								{viewData.facilities}
							</p>

							<p>
								<b>Services:</b>
								<br />
								{viewData.services}
							</p>
						</div>
					)}
					<DialogFooter>
						<Button onClick={() => setViewOpen(false)}>Close</Button>
					</DialogFooter>
				</DialogContent>
			</Dialog>
		</div>
	);
}
