"use client";

import React, { useState, useEffect } from "react";
import { apiClient } from "@/lib/api/client";

/* ------------------------------------------------------------------ */
/* Types                                                               */
/* ------------------------------------------------------------------ */

export interface ProcessStep {
  no: number;
  name: string;
  code: string;
  status: "completed" | "in_progress" | "waiting" | "acceptable";
  inputQty: number;
  goodQty: number;
  defectQty: number;
  planQty: number;
  availableQty: number;
}

interface ReworkChainItem {
  id: string;
  seq_no: string;
  process_code: string;
  process_name: string;
  status: string;
  input_qty: string;
  good_qty: string;
  defect_qty: string;
  concession_qty: string;
  is_rework: string;
  rework_source_id: string | null;
  started_at: string | null;
  completed_at: string | null;
}

interface ReworkChain {
  source: ReworkChainItem;
  reworks: ReworkChainItem[];
  totalReworkCount: number;
}

interface ProcessDetailModalProps {
  open: boolean;
  onClose: () => void;
  workInstructionNo: string;
  totalQty: number;
  steps: ProcessStep[];
  woId?: string;
  showReworkHistory?: boolean;
}

/* ------------------------------------------------------------------ */
/* Component                                                           */
/* ------------------------------------------------------------------ */

export function ProcessDetailModal({
  open,
  onClose,
  workInstructionNo,
  totalQty,
  steps,
  woId,
  showReworkHistory,
}: ProcessDetailModalProps) {
  const [activeTab, setActiveTab] = useState<"steps" | "rework">("steps");
  const [reworkChains, setReworkChains] = useState<ReworkChain[]>([]);
  const [reworkLoading, setReworkLoading] = useState(false);
  const [totalReworkCount, setTotalReworkCount] = useState(0);

  // Fetch rework history when tab switches to rework
  useEffect(() => {
    if (!open || !woId || activeTab !== "rework") return;
    let cancelled = false;
    const fetchHistory = async () => {
      setReworkLoading(true);
      try {
        const res = await apiClient.get(`/pop/production/rework-history/${woId}`);
        if (!cancelled && res.data?.success) {
          setReworkChains(res.data.data.chains || []);
          setTotalReworkCount(res.data.data.total_rework_count || 0);
        }
      } catch {
        // Non-fatal
      } finally {
        if (!cancelled) setReworkLoading(false);
      }
    };
    fetchHistory();
    return () => { cancelled = true; };
  }, [open, woId, activeTab]);

  // Reset tab on close
  useEffect(() => {
    if (!open) setActiveTab("steps");
  }, [open]);

  if (!open) return null;

  const completedCount = steps.filter((s) => s.status === "completed").length;
  const overallPct = steps.length > 0 ? Math.round((completedCount / steps.length) * 100) : 0;
  const hasReworkData = showReworkHistory && woId;

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center" style={{ background: "rgba(0,0,0,0.5)" }}>
      <div className="bg-white rounded-2xl shadow-2xl w-full max-w-lg mx-4 max-h-[90vh] flex flex-col overflow-hidden">
        {/* Header */}
        <div className="px-5 py-4 border-b border-gray-100 flex items-center justify-between">
          <div>
            <h3 className="text-lg font-bold text-gray-900">공정 순서 상세</h3>
            <p className="text-xs text-gray-400 mt-0.5">{workInstructionNo}</p>
          </div>
          <button
            onClick={onClose}
            className="w-8 h-8 rounded-lg bg-gray-100 flex items-center justify-center text-gray-500 hover:bg-gray-200 active:scale-95 transition-all"
          >
            <svg className="w-4 h-4" fill="none" stroke="currentColor" strokeWidth={2.5} viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" d="M6 18L18 6M6 6l12 12" />
            </svg>
          </button>
        </div>

        {/* Tab switcher — only show if rework data available */}
        {hasReworkData && (
          <div className="flex border-b border-gray-100">
            <button
              onClick={() => setActiveTab("steps")}
              className={`flex-1 py-3 text-sm font-bold transition-all ${
                activeTab === "steps"
                  ? "text-blue-600 border-b-2 border-blue-500"
                  : "text-gray-400 hover:text-gray-600"
              }`}
            >
              공정순서
            </button>
            <button
              onClick={() => setActiveTab("rework")}
              className={`flex-1 py-3 text-sm font-bold transition-all ${
                activeTab === "rework"
                  ? "text-orange-600 border-b-2 border-orange-500"
                  : "text-gray-400 hover:text-gray-600"
              }`}
            >
              재작업 이력
            </button>
          </div>
        )}

        {/* Scrollable body */}
        <div className="flex-1 overflow-y-auto">
        {/* Summary bar */}
        {activeTab === "steps" && (
        <div className="px-5 py-4">
          <div className="mb-4 p-4 bg-gray-50 rounded-xl">
            <div className="flex items-center justify-between mb-2">
              <span className="text-sm font-bold text-gray-900">작업지시 총량</span>
              <span className="text-xl font-extrabold text-gray-900">
                {totalQty.toLocaleString()} EA
              </span>
            </div>
            <div className="flex items-center gap-2">
              <div className="h-3 flex-1 bg-gray-200 rounded-full overflow-hidden">
                <div
                  className="h-full bg-blue-500 rounded-full transition-all"
                  style={{ width: `${overallPct}%` }}
                />
              </div>
              <span className="text-sm font-bold text-blue-600">
                {completedCount}/{steps.length} 공정
              </span>
            </div>
          </div>
        </div>
        )}

        {/* Steps — shown when activeTab is "steps" */}
        {activeTab === "steps" && (
        <div className="px-5 pb-4 max-h-[400px] overflow-y-auto -mt-2">
          {steps.map((s) => {
            const borderColor =
              s.status === "completed"
                ? "border-green-400 bg-green-50"
                : s.status === "in_progress"
                ? "border-blue-400 bg-blue-50"
                : s.status === "acceptable"
                ? "border-amber-400 bg-amber-50"
                : "border-gray-200 bg-gray-50";

            const dotColor =
              s.status === "completed"
                ? "bg-green-500"
                : s.status === "in_progress"
                ? "bg-blue-500"
                : s.status === "acceptable"
                ? "bg-amber-500"
                : "bg-gray-400";

            const badge =
              s.status === "completed" ? (
                <span className="text-xs font-bold px-3 py-1 rounded-full bg-green-100 text-green-700">완료</span>
              ) : s.status === "in_progress" ? (
                <span className="text-xs font-bold px-3 py-1 rounded-full bg-blue-100 text-blue-700">진행중</span>
              ) : s.status === "acceptable" ? (
                <span className="text-xs font-bold px-3 py-1 rounded-full bg-amber-100 text-amber-700">접수가능</span>
              ) : (
                <span className="text-xs font-bold px-3 py-1 rounded-full bg-gray-100 text-gray-500">대기</span>
              );

            const barColor =
              s.status === "completed"
                ? "bg-green-500"
                : s.status === "in_progress"
                ? "bg-blue-500"
                : s.status === "acceptable"
                ? "bg-amber-500"
                : "bg-gray-300";

            const barTextColor =
              s.status === "completed"
                ? "text-green-600"
                : s.status === "in_progress"
                ? "text-blue-600"
                : s.status === "acceptable"
                ? "text-amber-600"
                : "text-gray-400";

            const pct = s.planQty > 0 ? Math.round((s.inputQty / s.planQty) * 100) : 0;
            const unaccept = s.planQty - s.inputQty;

            return (
              <div key={s.code + "-" + s.no} className={`rounded-xl border-2 ${borderColor} mb-3 overflow-hidden`}>
                {/* Header */}
                <div className="flex items-center gap-3 p-4 pb-2">
                  <div
                    className={`w-10 h-10 rounded-full ${dotColor} text-white flex items-center justify-center text-base font-bold shrink-0`}
                  >
                    {s.no}
                  </div>
                  <div className="flex-1 min-w-0">
                    <div className="flex items-center justify-between">
                      <span className="text-base font-bold text-gray-900 truncate">{s.name}</span>
                      {badge}
                    </div>
                    <span className="text-xs text-gray-400">{s.code}</span>
                  </div>
                </div>

                {/* Progress bar */}
                <div className="px-4 pb-2">
                  <div className="flex items-center gap-2">
                    <div className="h-2.5 flex-1 bg-gray-100 rounded-full overflow-hidden">
                      <div
                        className={`h-full ${barColor} rounded-full transition-all`}
                        style={{ width: `${Math.min(pct, 100)}%` }}
                      />
                    </div>
                    <span className={`text-xs font-bold ${barTextColor}`}>{pct}%</span>
                  </div>
                </div>

                {/* Qty grid */}
                <div className="grid grid-cols-4 gap-1 px-4 pb-3">
                  <div className="text-center py-1.5">
                    <div className="text-[10px] text-gray-400">지시</div>
                    <div className="text-base font-extrabold text-gray-900">{s.planQty.toLocaleString()}</div>
                  </div>
                  <div className="text-center py-1.5">
                    <div className="text-[10px] text-blue-500">접수</div>
                    <div className="text-base font-extrabold text-blue-700">{s.inputQty.toLocaleString()}</div>
                  </div>
                  <div className="text-center py-1.5">
                    <div className="text-[10px] text-emerald-500">양품</div>
                    <div className="text-base font-extrabold text-emerald-600">{s.goodQty.toLocaleString()}</div>
                  </div>
                  {s.status === "completed" || s.status === "in_progress" ? (
                    <div className="text-center py-1.5">
                      <div className="text-[10px] text-red-500">불량</div>
                      <div className="text-base font-extrabold text-red-600">{s.defectQty.toLocaleString()}</div>
                    </div>
                  ) : (
                    <div className="text-center py-1.5">
                      <div className="text-[10px] text-gray-400">미접수</div>
                      <div className="text-base font-extrabold text-gray-500">{Math.max(0, unaccept).toLocaleString()}</div>
                    </div>
                  )}
                </div>

                {/* Additional accept qty */}
                {s.status === "in_progress" && s.availableQty > 0 && (
                  <div className="px-4 pb-3 text-right">
                    <span className="text-xs text-violet-600 font-semibold">
                      추가접수가능 {s.availableQty.toLocaleString()}
                    </span>
                  </div>
                )}
                {s.status === "acceptable" && s.availableQty > 0 && (
                  <div className="px-4 pb-3 text-right">
                    <span className="text-xs text-amber-600 font-semibold">
                      접수가능 {s.availableQty.toLocaleString()}
                    </span>
                  </div>
                )}
              </div>
            );
          })}
        </div>
        )}

        {/* Rework History — shown when activeTab is "rework" */}
        {activeTab === "rework" && (
          <div className="px-5 py-4 max-h-[450px] overflow-y-auto">
            {reworkLoading ? (
              <div className="flex items-center justify-center py-12">
                <div className="animate-spin w-8 h-8 border-4 border-orange-200 border-t-orange-500 rounded-full" />
              </div>
            ) : reworkChains.length === 0 ? (
              <div className="text-center py-12">
                <div className="text-4xl mb-3">&#128269;</div>
                <p className="text-sm text-gray-400">재작업 이력이 없습니다</p>
              </div>
            ) : (
              <>
                {/* Summary */}
                <div className="mb-4 p-3 bg-orange-50 border border-orange-200 rounded-xl">
                  <div className="flex items-center justify-between">
                    <span className="text-sm font-bold text-orange-700">총 재작업</span>
                    <span className="text-lg font-extrabold text-orange-600">{totalReworkCount}회</span>
                  </div>
                  <p className="text-xs text-orange-500 mt-1">{reworkChains.length}개 불량 발생 지점</p>
                </div>

                {/* Chain tree */}
                {reworkChains.map((chain, chainIdx) => {
                  const srcDefect = parseInt(chain.source.defect_qty || "0", 10);
                  const srcGood = parseInt(chain.source.good_qty || "0", 10);

                  return (
                    <div key={chain.source.id} className={`mb-4 ${chainIdx < reworkChains.length - 1 ? "pb-4 border-b border-gray-100" : ""}`}>
                      {/* Source (origin) node */}
                      <div className="flex items-start gap-3 mb-2">
                        <div className="flex flex-col items-center">
                          <div className="w-9 h-9 rounded-full bg-red-500 text-white flex items-center justify-center text-sm font-bold shrink-0">
                            {chain.source.seq_no || "?"}
                          </div>
                          {chain.reworks.length > 0 && (
                            <div className="w-0.5 h-4 bg-orange-300" />
                          )}
                        </div>
                        <div className="flex-1 min-w-0">
                          <div className="flex items-center justify-between">
                            <span className="text-sm font-bold text-gray-900 truncate">
                              {chain.source.process_name || chain.source.process_code}
                            </span>
                            <span className="text-xs font-bold px-2 py-0.5 rounded-full bg-red-100 text-red-600 shrink-0">
                              불량 {srcDefect}
                            </span>
                          </div>
                          <div className="flex gap-3 mt-1 text-xs text-gray-500">
                            <span>양품 {srcGood}</span>
                            <span>불량 {srcDefect}</span>
                          </div>
                        </div>
                      </div>

                      {/* Rework chain nodes */}
                      {chain.reworks.map((rw, rwIdx) => {
                        const rwGood = parseInt(rw.good_qty || "0", 10);
                        const rwDefect = parseInt(rw.defect_qty || "0", 10);
                        const rwInput = parseInt(rw.input_qty || "0", 10);
                        const isLast = rwIdx === chain.reworks.length - 1;

                        const statusColor =
                          rw.status === "completed" ? "bg-green-500"
                          : rw.status === "in_progress" ? "bg-blue-500"
                          : rw.status === "acceptable" ? "bg-amber-500"
                          : "bg-gray-400";

                        const statusLabel =
                          rw.status === "completed" ? "완료"
                          : rw.status === "in_progress" ? "진행중"
                          : rw.status === "acceptable" ? "접수가능"
                          : "대기";

                        return (
                          <div key={rw.id} className="flex items-start gap-3 ml-1">
                            <div className="flex flex-col items-center">
                              {!isLast && <div className="w-0.5 h-2 bg-orange-200" />}
                              <div className={`w-7 h-7 rounded-full ${statusColor} text-white flex items-center justify-center text-xs font-bold shrink-0 ring-2 ring-orange-200`}>
                                R{rwIdx + 1}
                              </div>
                              {!isLast && <div className="w-0.5 h-4 bg-orange-200" />}
                            </div>
                            <div className="flex-1 min-w-0 pb-2">
                              <div className="flex items-center justify-between">
                                <span className="text-sm font-semibold text-gray-800 truncate">
                                  {rw.process_name || rw.process_code}
                                </span>
                                <span className={`text-[10px] font-bold px-2 py-0.5 rounded-full ${
                                  rw.status === "completed" ? "bg-green-100 text-green-700"
                                  : rw.status === "in_progress" ? "bg-blue-100 text-blue-700"
                                  : rw.status === "acceptable" ? "bg-amber-100 text-amber-700"
                                  : "bg-gray-100 text-gray-500"
                                }`}>
                                  {statusLabel}
                                </span>
                              </div>
                              <div className="flex gap-3 mt-1 text-xs text-gray-500">
                                <span>투입 {rwInput}</span>
                                <span>양품 {rwGood}</span>
                                {rwDefect > 0 && <span className="text-red-500">불량 {rwDefect}</span>}
                              </div>
                            </div>
                          </div>
                        );
                      })}
                    </div>
                  );
                })}
              </>
            )}
          </div>
        )}

        </div>{/* end scrollable body */}

        {/* Footer */}
        <div className="shrink-0 px-5 py-3 border-t border-gray-100">
          <button
            onClick={onClose}
            className="w-full py-3 rounded-xl text-sm font-bold text-white bg-blue-500 active:scale-[0.98] transition-all"
          >
            닫기
          </button>
        </div>
      </div>
    </div>
  );
}