/**
 * 採購單管理主頁面
 */

import { useState, useEffect } from "react";
import { Plus, ShoppingCart, Search, RotateCcw, Calendar, ChevronDown, ChevronUp } from 'lucide-react';
import { Button } from "@/Components/ui/button";
import AuthenticatedLayout from "@/Layouts/AuthenticatedLayout";
import { Head, router } from "@inertiajs/react";
import PurchaseOrderTable from "@/Components/PurchaseOrder/PurchaseOrderTable";
import type { PurchaseOrder } from "@/types/purchase-order";
import Pagination from "@/Components/shared/Pagination";
import { getBreadcrumbs } from "@/utils/breadcrumb";
import { getDateRange } from "@/utils/format";
import { Can } from "@/Components/Permission/Can";
import { SearchableSelect } from "@/Components/ui/searchable-select";
import { Input } from "@/Components/ui/input";
import { Label } from "@/Components/ui/label";
import {
    Select,
    SelectContent,
    SelectItem,
    SelectTrigger,
    SelectValue,
} from "@/Components/ui/select";

interface Props {
    orders: {
        data: PurchaseOrder[];
        links: any[];
        total: number;
        from: number;
        to: number;
    };
    filters: {
        search?: string;
        status?: string;
        warehouse_id?: string;
        date_start?: string;
        date_end?: string;
        sort_field?: string;
        sort_direction?: string;
        per_page?: string;
    };
    warehouses: { id: number; name: string }[];
}

export default function PurchaseOrderIndex({ orders, filters, warehouses }: Props) {
    // 篩選狀態
    const [search, setSearch] = useState(filters.search || "");
    const [status, setStatus] = useState<string>(filters.status || "all");
    const [warehouseId, setWarehouseId] = useState<string>(filters.warehouse_id || "all");
    const [dateStart, setDateStart] = useState(filters.date_start || "");
    const [dateEnd, setDateEnd] = useState(filters.date_end || "");
    const [perPage, setPerPage] = useState<string>(filters.per_page || "10");
    const [dateRangeType, setDateRangeType] = useState('custom');

    // Advanced Filter Toggle
    const [showAdvancedFilter, setShowAdvancedFilter] = useState(
        !!(filters.date_start || filters.date_end)
    );

    // 同步 URL 參數到 State (雖有初始值，但若由外部連結進入可確保同步)
    useEffect(() => {
        setSearch(filters.search || "");
        setStatus(filters.status || "all");
        setWarehouseId(filters.warehouse_id || "all");
        setDateStart(filters.date_start || "");
        setDateEnd(filters.date_end || "");
        setPerPage(filters.per_page || "10");
    }, [filters]);

    const handleFilter = () => {
        router.get(
            route('purchase-orders.index'),
            {
                search,
                status: status === 'all' ? undefined : status,
                warehouse_id: warehouseId === 'all' ? undefined : warehouseId,
                date_start: dateStart,
                date_end: dateEnd,
                per_page: perPage,
                sort_field: filters.sort_field,
                sort_direction: filters.sort_direction,
            },
            { preserveState: true, replace: true }
        );
    };

    const handleReset = () => {
        setSearch("");
        setStatus("all");
        setWarehouseId("all");
        setDateStart("");
        setDateEnd("");
        setDateRangeType("custom");

        router.get(route('purchase-orders.index'));
    };

    const handleDateRangeChange = (type: string) => {
        setDateRangeType(type);
        if (type === 'custom') return;

        const { start, end } = getDateRange(type);
        setDateStart(start);
        setDateEnd(end);
    };

    const handlePerPageChange = (value: string) => {
        setPerPage(value);
        router.get(
            route("purchase-orders.index"),
            {
                ...filters,
                per_page: value,
            },
            { preserveState: false, replace: true, preserveScroll: true }
        );
    };

    const handleNavigateToCreateOrder = () => {
        router.get(route('purchase-orders.create'));
    };

    return (
        <AuthenticatedLayout breadcrumbs={getBreadcrumbs("purchaseOrders")}>
            <Head title="採購單管理" />
            <div className="container mx-auto p-6 max-w-7xl">
                <div className="flex items-center justify-between mb-6">
                    <div>
                        <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                            <ShoppingCart className="h-6 w-6 text-primary-main" />
                            採購單管理
                        </h1>
                        <p className="text-gray-500 mt-1">
                            建立與管理採購訂單，追蹤入庫狀態
                        </p>
                    </div>
                    <div className="flex gap-2">
                        <Can permission="purchase_orders.create">
                            <Button
                                onClick={handleNavigateToCreateOrder}
                                className="gap-2 button-filled-primary"
                            >
                                <Plus className="h-4 w-4" />
                                建立採購單
                            </Button>
                        </Can>
                    </div>
                </div>

                {/* 篩選區塊 */}
                <div className="bg-white p-5 rounded-lg shadow-sm border border-gray-200 mb-6">
                    {/* Row 1: Search, Status, Warehouse */}
                    <div className="grid grid-cols-1 md:grid-cols-12 gap-4 mb-4">
                        <div className="md:col-span-4 space-y-1">
                            <Label className="text-xs font-medium text-grey-1">關鍵字搜尋</Label>
                            <div className="relative">
                                <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 h-4 w-4" />
                                <Input
                                    placeholder="搜尋採購單號、廠商..."
                                    value={search}
                                    onChange={(e) => setSearch(e.target.value)}
                                    className="pl-10 h-9 block"
                                    onKeyDown={(e) => e.key === 'Enter' && handleFilter()}
                                />
                            </div>
                        </div>

                        <div className="md:col-span-4 space-y-1">
                            <Label className="text-xs font-medium text-grey-1">訂單狀態</Label>
                            <Select value={status} onValueChange={setStatus}>
                                <SelectTrigger className="h-9">
                                    <SelectValue placeholder="選擇狀態" />
                                </SelectTrigger>
                                <SelectContent>
                                    <SelectItem value="all">全部狀態</SelectItem>
                                    <SelectItem value="draft">草稿</SelectItem>
                                    <SelectItem value="pending">待審核</SelectItem>
                                    <SelectItem value="processing">處理中</SelectItem>
                                    <SelectItem value="shipping">運送中</SelectItem>
                                    <SelectItem value="confirming">待確認</SelectItem>
                                    <SelectItem value="completed">已完成</SelectItem>
                                    <SelectItem value="partial">部分進貨</SelectItem>
                                    <SelectItem value="cancelled">已取消</SelectItem>
                                </SelectContent>
                            </Select>
                        </div>

                        <div className="md:col-span-4 space-y-1">
                            <Label className="text-xs font-medium text-grey-1">入庫倉庫</Label>
                            <SearchableSelect
                                value={warehouseId}
                                onValueChange={setWarehouseId}
                                options={[
                                    { label: "全部倉庫", value: "all" },
                                    ...warehouses.map(w => ({ label: w.name, value: String(w.id) }))
                                ]}
                                placeholder="選擇倉庫"
                                className="w-full h-9"
                            />
                        </div>
                    </div>

                    {/* Row 2: Date Filters (Collapsible) */}
                    {showAdvancedFilter && (
                        <div className="grid grid-cols-1 md:grid-cols-12 gap-4 items-end animate-in fade-in slide-in-from-top-2 duration-200">
                            <div className="md:col-span-6 space-y-2">
                                <Label className="text-xs font-medium text-grey-1">快速時間區間</Label>
                                <div className="flex flex-wrap gap-2">
                                    {[
                                        { label: "今日", value: "today" },
                                        { label: "昨日", value: "yesterday" },
                                        { label: "本週", value: "this_week" },
                                        { label: "本月", value: "this_month" },
                                        { label: "上月", value: "last_month" },
                                    ].map((opt) => (
                                        <Button
                                            key={opt.value}
                                            size="sm"
                                            onClick={() => handleDateRangeChange(opt.value)}
                                            className={
                                                dateRangeType === opt.value
                                                    ? 'button-filled-primary h-9 px-4 shadow-sm'
                                                    : 'button-outlined-primary h-9 px-4 bg-white'
                                            }
                                        >
                                            {opt.label}
                                        </Button>
                                    ))}
                                </div>
                            </div>

                            <div className="md:col-span-6">
                                <div className="grid grid-cols-2 gap-4 items-end">
                                    <div className="space-y-1">
                                        <Label className="text-xs text-grey-2 font-medium">開始日期</Label>
                                        <div className="relative">
                                            <Calendar className="absolute left-2.5 top-1/2 transform -translate-y-1/2 h-4 w-4 text-gray-400 pointer-events-none" />
                                            <Input
                                                type="date"
                                                value={dateStart}
                                                onChange={(e) => {
                                                    setDateStart(e.target.value);
                                                    setDateRangeType('custom');
                                                }}
                                                className="pl-9 block w-full h-9 bg-white"
                                            />
                                        </div>
                                    </div>
                                    <div className="space-y-1">
                                        <Label className="text-xs text-grey-2 font-medium">結束日期</Label>
                                        <div className="relative">
                                            <Calendar className="absolute left-2.5 top-1/2 transform -translate-y-1/2 h-4 w-4 text-gray-400 pointer-events-none" />
                                            <Input
                                                type="date"
                                                value={dateEnd}
                                                onChange={(e) => {
                                                    setDateEnd(e.target.value);
                                                    setDateRangeType('custom');
                                                }}
                                                className="pl-9 block w-full h-9 bg-white text-left"
                                            />
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    )}

                    <div className="flex items-center justify-end border-t border-grey-4 pt-5 gap-3 mt-4">
                        <Button
                            variant="ghost"
                            size="sm"
                            onClick={() => setShowAdvancedFilter(!showAdvancedFilter)}
                            className="mr-auto text-gray-500 hover:text-gray-900 h-9"
                        >
                            {showAdvancedFilter ? (
                                <>
                                    <ChevronUp className="h-4 w-4 mr-1" />
                                    收合篩選
                                </>
                            ) : (
                                <>
                                    <ChevronDown className="h-4 w-4 mr-1" />
                                    進階篩選
                                    {(dateStart || dateEnd) && (
                                        <span className="ml-2 w-2 h-2 rounded-full bg-primary-main" />
                                    )}
                                </>
                            )}
                        </Button>
                        <Button
                            variant="outline"
                            onClick={handleReset}
                            className="flex items-center gap-2 button-outlined-primary h-9"
                        >
                            <RotateCcw className="h-4 w-4" />
                            重置
                        </Button>
                        <Button
                            onClick={handleFilter}
                            className="flex items-center gap-2 button-filled-primary h-9 px-6"
                        >
                            <Search className="h-4 w-4" />
                            查詢
                        </Button>
                    </div>
                </div>

                <PurchaseOrderTable
                    orders={orders.data}
                />

                {/* 分頁元件 - 統一樣式 */}
                <div className="mt-4 flex flex-col sm:flex-row items-start sm:items-center justify-between gap-4">
                    <div className="flex items-center gap-2 text-sm text-gray-500">
                        <span>每頁顯示</span>
                        <SearchableSelect
                            value={perPage}
                            onValueChange={handlePerPageChange}
                            options={[
                                { label: "10", value: "10" },
                                { label: "20", value: "20" },
                                { label: "50", value: "50" },
                                { label: "100", value: "100" }
                            ]}
                            className="w-[100px] h-8"
                            showSearch={false}
                        />
                        <span>筆</span>
                    </div>
                    <div className="w-full sm:w-auto flex justify-center sm:justify-end">
                        <Pagination links={orders.links} />
                    </div>
                </div>
            </div>
        </AuthenticatedLayout>
    );
}
