"use client";

/**
 * ShippingPlanBatchModal — 출하계획 동시 등록 모달
 */

import React, { useState, useEffect, useCallback } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
import { Plus, X, Loader2, Package, Truck, Clock } from "lucide-react";
import { cn } from "@/lib/utils";
import { toast } from "sonner";
import { FormDatePicker } from "@/components/screen/filters/FormDatePicker";
import { FullscreenDialog } from "@/components/common/FullscreenDialog";
import {
  getShippingPlanAggregate,
  batchSaveShippingPlans,
  type AggregateResponse,
  type BatchSavePlan,
} from "@/lib/api/shipping";

// --- 시간 선택 컴포넌트 (오전/오후 + 시 + 분) ---
function TimePicker({ value, onChange }: { value: string; onChange: (v: string) => void }) {
  const [open, setOpen] = useState(false);

  // value: "HH:MM" or ""
  const parsed = value ? value.split(":") : ["", ""];
  const hour24 = parsed[0] ? parseInt(parsed[0]) : -1;
  const minute = parsed[1] ? parseInt(parsed[1]) : -1;
  const isAM = hour24 >= 0 && hour24 < 12;
  const [period, setPeriod] = useState<"오전" | "오후">(isAM ? "오전" : "오후");

  const hours = Array.from({ length: 12 }, (_, i) => i); // 0-11
  const minutes = Array.from({ length: 12 }, (_, i) => i * 5); // 0,5,10...55

  const displayHour = hour24 >= 0 ? (hour24 % 12 || 12) : null;
  const displayMinute = minute >= 0 ? minute : null;

  const select = (p: "오전" | "오후", h: number, m: number) => {
    const h24 = p === "오전" ? (h === 12 ? 0 : h) : (h === 12 ? 12 : h + 12);
    onChange(`${String(h24).padStart(2, "0")}:${String(m).padStart(2, "0")}`);
  };

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button variant="outline" className="h-7 w-full justify-start text-xs font-normal gap-1 px-2">
          <Clock className="h-3 w-3 shrink-0 opacity-50" />
          {value || "--:--"}
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-auto p-0" align="start">
        <div className="flex">
          {/* 오전/오후 */}
          <div className="border-r p-1 flex flex-col gap-0.5">
            {(["오전", "오후"] as const).map((p) => (
              <button key={p} onClick={() => setPeriod(p)}
                className={cn("px-3 py-1.5 text-xs rounded", period === p ? "bg-primary text-primary-foreground" : "hover:bg-muted")}>
                {p}
              </button>
            ))}
          </div>
          {/* 시 */}
          <div className="border-r p-1 max-h-48 overflow-auto flex flex-col gap-0.5">
            {[12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11].map((h) => (
              <button key={h} onClick={() => select(period, h, displayMinute ?? 0)}
                className={cn("px-3 py-1 text-xs rounded min-w-[32px]",
                  displayHour === h ? "bg-primary text-primary-foreground" : "hover:bg-muted")}>
                {String(h).padStart(2, "0")}
              </button>
            ))}
          </div>
          {/* 분 */}
          <div className="p-1 max-h-48 overflow-auto flex flex-col gap-0.5">
            {minutes.map((m) => (
              <button key={m} onClick={() => select(period, displayHour ?? 12, m)}
                className={cn("px-3 py-1 text-xs rounded min-w-[32px]",
                  displayMinute === m ? "bg-primary text-primary-foreground" : "hover:bg-muted")}>
                {String(m).padStart(2, "0")}
              </button>
            ))}
          </div>
        </div>
      </PopoverContent>
    </Popover>
  );
}

// --- 타입 ---
interface NewPlanRow {
  _id: string;
  sourceId: string;
  partCode: string;
  planQty: string;
  planDate: string;
  planTime: string;
  shipInfo: string;
}

interface ShippingPlanBatchModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  selectedDetailIds: string[];
  onSuccess?: () => void;
}

function StatCard({ label, value, color }: { label: string; value: number; color: string }) {
  return (
    <div className={cn("rounded-lg px-3 py-2.5 flex-1 min-w-0", color)}>
      <div className="text-[10px] opacity-80 whitespace-nowrap">{label}</div>
      <div className="text-lg font-bold">{value.toLocaleString()}</div>
    </div>
  );
}

// --- 메인 ---
export function ShippingPlanBatchModal({
  open, onOpenChange, selectedDetailIds, onSuccess,
}: ShippingPlanBatchModalProps) {
  const [loading, setLoading] = useState(false);
  const [saving, setSaving] = useState(false);
  const [aggregate, setAggregate] = useState<AggregateResponse>({});
  const [newPlans, setNewPlans] = useState<Record<string, NewPlanRow[]>>({});

  useEffect(() => {
    if (!open || selectedDetailIds.length === 0) return;
    const load = async () => {
      setLoading(true);
      try {
        const result = await getShippingPlanAggregate(selectedDetailIds);
        if (result.success && result.data) {
          setAggregate(result.data);
          const plans: Record<string, NewPlanRow[]> = {};
          for (const partCode of Object.keys(result.data)) {
            plans[partCode] = [makeNewRow(partCode, result.data[partCode].orders[0]?.sourceId || "")];
          }
          setNewPlans(plans);
        }
      } catch (err) {
        console.error("출하계획 집계 조회 실패:", err);
        toast.error("출하계획 정보를 불러오는데 실패했습니다.");
      } finally {
        setLoading(false);
      }
    };
    load();
  }, [open, selectedDetailIds]);

  const makeNewRow = (partCode: string, sourceId: string): NewPlanRow => ({
    _id: `new_${Date.now()}_${Math.random()}`,
    sourceId, partCode, planQty: "", planDate: "", planTime: "", shipInfo: "",
  });

  const addRow = (partCode: string) => {
    const sourceId = aggregate[partCode]?.orders[0]?.sourceId || "";
    setNewPlans((prev) => ({ ...prev, [partCode]: [...(prev[partCode] || []), makeNewRow(partCode, sourceId)] }));
  };

  const removeRow = (partCode: string, rowId: string) => {
    setNewPlans((prev) => ({ ...prev, [partCode]: (prev[partCode] || []).filter((r) => r._id !== rowId) }));
  };

  const updateRow = (partCode: string, rowId: string, field: keyof NewPlanRow, value: string) => {
    // planQty 변경 시 총수주잔량 초과 검증
    if (field === "planQty" && value) {
      const agg = aggregate[partCode];
      if (agg) {
        const maxQty = agg.totalBalance - agg.totalPlanQty; // 기존 계획 제외한 잔여 가능량
        const otherSum = (newPlans[partCode] || [])
          .filter((r) => r._id !== rowId)
          .reduce((sum, r) => sum + (Number(r.planQty) || 0), 0);
        const remaining = maxQty - otherSum;
        if (Number(value) > remaining) {
          toast.error(`출하계획량이 잔여 가능량(${remaining.toLocaleString()})을 초과할 수 없습니다.`);
          value = String(Math.max(0, remaining));
        }
      }
    }
    setNewPlans((prev) => ({
      ...prev,
      [partCode]: (prev[partCode] || []).map((r) => r._id === rowId ? { ...r, [field]: value } : r),
    }));
  };

  const totalNewPlans = Object.values(newPlans).flat().filter((r) => r.planQty && Number(r.planQty) > 0).length;

  const handleSave = async () => {
    const plans: BatchSavePlan[] = [];
    for (const rows of Object.values(newPlans)) {
      for (const row of rows) {
        const qty = Number(row.planQty);
        if (qty <= 0) continue;
        plans.push({ sourceId: row.sourceId, planQty: qty, planDate: row.planDate || undefined });
      }
    }
    if (plans.length === 0) { toast.error("출하계획 수량을 입력해주세요."); return; }

    setSaving(true);
    try {
      const result = await batchSaveShippingPlans(plans, "detail");
      if (result.success) {
        toast.success(`출하계획 ${plans.length}건이 등록되었습니다.`);
        onSuccess?.();
        onOpenChange(false);
      } else {
        toast.error(result.message || "등록 실패");
      }
    } catch { toast.error("등록 실패"); } finally { setSaving(false); }
  };

  const partCodes = Object.keys(aggregate);

  return (
    <FullscreenDialog
      open={open}
      onOpenChange={onOpenChange}
      title={<><Truck className="h-5 w-5 inline mr-2" />출하계획 동시 등록</>}
      description={<>출하계획 설정: <strong>{totalNewPlans}개</strong></>}
      defaultMaxWidth="max-w-[1200px]"
      footer={
        <div className="flex items-center justify-between w-full">
          <span className="text-sm text-muted-foreground">💡 수주 등 시 출하계획도 함께 저장됩니다</span>
          <div className="flex gap-2">
            <Button variant="outline" onClick={() => onOpenChange(false)}>닫기</Button>
            <Button onClick={handleSave} disabled={saving || totalNewPlans === 0}>
              {saving && <Loader2 className="w-4 h-4 mr-1.5 animate-spin" />} 적용
            </Button>
          </div>
        </div>
      }
    >

        <div className="flex-1 overflow-auto space-y-6 py-2 px-1">
          {loading ? (
            <div className="flex items-center justify-center h-40"><Loader2 className="h-8 w-8 animate-spin text-muted-foreground" /></div>
          ) : partCodes.length === 0 ? (
            <div className="text-center text-muted-foreground py-10">선택된 품목이 없습니다.</div>
          ) : partCodes.map((partCode) => {
            const agg = aggregate[partCode];
            const orders = agg.orders || [];
            const existingPlans = agg.existingPlans || [];
            const rows = newPlans[partCode] || [];
            const firstOrder = orders[0];

            return (
              <div key={partCode} className="border rounded-xl overflow-hidden bg-card">
                {/* 품목 헤더 */}
                <div className="flex items-center justify-between px-5 py-3 bg-muted/30 border-b">
                  <div className="flex items-center gap-3">
                    <Package className="h-7 w-7 text-muted-foreground shrink-0" />
                    <div>
                      <div className="text-[10px] text-muted-foreground">품목코드</div>
                      <div className="font-bold">{partCode}</div>
                    </div>
                  </div>
                  <div className="text-right">
                    <div className="text-[10px] text-muted-foreground">품명</div>
                    <div className="font-bold">{firstOrder?.partName || "-"}</div>
                  </div>
                </div>

                {/* 통계 카드 (신규 입력량 반영) */}
                {(() => {
                  const newQtySum = (newPlans[partCode] || []).reduce((sum, r) => sum + (Number(r.planQty) || 0), 0);
                  const totalPlanQty = agg.totalPlanQty + newQtySum;
                  const availableStock = agg.currentStock - totalPlanQty;
                  return (
                    <div className="flex gap-2 px-4 py-2.5">
                      <StatCard label="총수주잔량" value={agg.totalBalance} color="bg-violet-100 text-violet-900 dark:bg-violet-900/30 dark:text-violet-200" />
                      <StatCard label="총출하계획량" value={totalPlanQty} color="bg-blue-100 text-blue-900 dark:bg-blue-900/30 dark:text-blue-200" />
                      <StatCard label="현재고" value={agg.currentStock} color="bg-amber-100 text-amber-900 dark:bg-amber-900/30 dark:text-amber-200" />
                      <StatCard label="가용재고" value={availableStock} color="bg-emerald-100 text-emerald-900 dark:bg-emerald-900/30 dark:text-emerald-200" />
                      <StatCard label="생산중수량" value={agg.inProductionQty} color="bg-cyan-100 text-cyan-900 dark:bg-cyan-900/30 dark:text-cyan-200" />
                    </div>
                  );
                })()}

                {/* 테이블 — overflow-x-auto로 겹침 방지 */}
                <div className="px-4 pb-3">
                  <table className="w-full text-sm table-fixed">
                    <colgroup>
                      <col style={{ width: 50 }} />
                      <col style={{ width: "16%" }} />
                      <col style={{ width: "9%" }} />
                      <col style={{ width: "7%" }} />
                      <col style={{ width: "6%" }} />
                      <col style={{ width: "7%" }} />
                      <col style={{ width: "17%" }} />
                      <col style={{ width: "10%" }} />
                      <col style={{ width: "14%" }} />
                      <col style={{ width: 42 }} />
                    </colgroup>
                    <thead>
                      <tr className="border-b text-xs text-muted-foreground">
                        <th className="py-2 text-left">구분</th>
                        <th className="py-2 text-left">수주번호</th>
                        <th className="py-2 text-left">거래처</th>
                        <th className="py-2 text-left">납기일</th>
                        <th className="py-2 text-right">미출하</th>
                        <th className="py-2 text-center">출하계획량</th>
                        <th className="py-2 text-center">출하계획일</th>
                        <th className="py-2 text-center">시간</th>
                        <th className="py-2 text-left">출하정보</th>
                        <th className="py-2 text-center">분할</th>
                      </tr>
                    </thead>
                    <tbody>
                      {/* 기존 계획 */}
                      {existingPlans.map((plan) => {
                        const order = orders.find((o) => o.sourceId === plan.sourceId);
                        return (
                          <tr key={`ex-${plan.id}`} className="border-b border-dashed">
                            <td className="py-2"><Badge variant="secondary" className="text-[10px]">기존</Badge></td>
                            <td className="py-2 text-xs truncate max-w-[150px]">{order?.orderNo || "-"}</td>
                            <td className="py-2 text-xs">{order?.partnerName || "-"}</td>
                            <td className="py-2 text-xs">{order?.dueDate?.split("T")[0] || "-"}</td>
                            <td className="py-2 text-right text-xs">{order?.balanceQty?.toLocaleString() || "-"}</td>
                            <td className="py-2 text-center text-xs">{plan.planQty.toLocaleString()}</td>
                            <td className="py-2 text-center text-xs">{plan.planDate?.split("T")[0] || "-"}</td>
                            <td className="py-2 text-center text-xs">-</td>
                            <td className="py-2 text-xs">{plan.shipmentPlanNo || "-"}</td>
                            <td></td>
                          </tr>
                        );
                      })}

                      {/* 신규 입력 행 */}
                      {rows.map((row, rowIdx) => {
                        const order = orders.find((o) => o.sourceId === row.sourceId) || orders[0];
                        return (
                          <tr key={row._id} className="border-b">
                            <td className="py-2.5"><Badge className="text-[10px] bg-primary">신규</Badge></td>
                            <td className="py-2.5 text-xs truncate">{order?.orderNo || "-"}</td>
                            <td className="py-2.5 text-xs">{order?.partnerName || "-"}</td>
                            <td className="py-2.5 text-xs">{order?.dueDate?.split("T")[0] || "-"}</td>
                            <td className="py-2.5 text-right text-xs">{order?.balanceQty?.toLocaleString() || "-"}</td>
                            <td className="py-2 px-1">
                              <Input value={row.planQty}
                                onChange={(e) => {
                                  const raw = e.target.value.replace(/[^0-9]/g, "");
                                  updateRow(partCode, row._id, "planQty", raw ? String(Number(raw)) : "");
                                }}
                                className="h-8 text-xs text-center" placeholder="0" />
                            </td>
                            <td className="py-2 px-1">
                              <FormDatePicker value={row.planDate}
                                onChange={(v) => updateRow(partCode, row._id, "planDate", v)} placeholder="계획일" />
                            </td>
                            <td className="py-2 px-1">
                              <TimePicker value={row.planTime}
                                onChange={(v) => updateRow(partCode, row._id, "planTime", v)} />
                            </td>
                            <td className="py-2 px-1">
                              <Input value={row.shipInfo}
                                onChange={(e) => updateRow(partCode, row._id, "shipInfo", e.target.value)}
                                className="h-8 text-xs" placeholder="출하정보 입력" />
                            </td>
                            <td className="py-2 text-center">
                              {rowIdx === rows.length - 1 ? (
                                <Button variant="outline" size="sm" className="h-7 w-7 p-0 rounded-full"
                                  onClick={() => addRow(partCode)}><Plus className="h-3.5 w-3.5" /></Button>
                              ) : (
                                <Button variant="ghost" size="sm" className="h-7 w-7 p-0 text-destructive"
                                  onClick={() => removeRow(partCode, row._id)}><X className="h-3.5 w-3.5" /></Button>
                              )}
                            </td>
                          </tr>
                        );
                      })}
                    </tbody>
                  </table>
                </div>
              </div>
            );
          })}
        </div>

    </FullscreenDialog>
  );
}