"use client";

import React, { useState, useEffect } from "react";
import { Plus, Trash2, GripVertical, Check, ChevronsUpDown } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Switch } from "@/components/ui/switch";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
import { Command, CommandEmpty, CommandGroup, CommandInput, CommandItem, CommandList } from "@/components/ui/command";
import { cn } from "@/lib/utils";
import { ProcessWorkStandardConfig, WorkPhaseDefinition, DetailTypeDefinition } from "./types";
import { defaultConfig } from "./config";

interface TableInfo { tableName: string; displayName?: string; }
interface ColumnInfo { columnName: string; displayName?: string; dataType?: string; }

function TableCombobox({ value, onChange, tables, loading }: {
  value: string; onChange: (v: string) => void; tables: TableInfo[]; loading: boolean;
}) {
  const [open, setOpen] = useState(false);
  const selected = tables.find((t) => t.tableName === value);
  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button variant="outline" role="combobox" aria-expanded={open} className="mt-1 h-8 w-full justify-between text-xs" disabled={loading}>
          {loading ? "로딩 중..." : selected ? selected.displayName || selected.tableName : "테이블 선택"}
          <ChevronsUpDown className="ml-2 h-3 w-3 shrink-0 opacity-50" />
        </Button>
      </PopoverTrigger>
      <PopoverContent className="p-0" style={{ width: "var(--radix-popover-trigger-width)" }} align="start">
        <Command>
          <CommandInput placeholder="테이블 검색..." className="text-xs" />
          <CommandList>
            <CommandEmpty className="py-4 text-center text-xs">테이블을 찾을 수 없습니다.</CommandEmpty>
            <CommandGroup className="max-h-[200px] overflow-auto">
              {tables.map((t) => (
                <CommandItem key={t.tableName} value={`${t.displayName || ""} ${t.tableName}`}
                  onSelect={() => { onChange(t.tableName); setOpen(false); }} className="text-xs">
                  <Check className={cn("mr-2 h-3 w-3", value === t.tableName ? "opacity-100" : "opacity-0")} />
                  <div className="flex flex-col">
                    <span className="font-medium">{t.displayName || t.tableName}</span>
                    {t.displayName && <span className="text-[10px] text-muted-foreground">{t.tableName}</span>}
                  </div>
                </CommandItem>
              ))}
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  );
}

function ColumnCombobox({ value, onChange, tableName, placeholder }: {
  value: string; onChange: (v: string) => void; tableName: string; placeholder?: string;
}) {
  const [open, setOpen] = useState(false);
  const [columns, setColumns] = useState<ColumnInfo[]>([]);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    if (!tableName) { setColumns([]); return; }
    const load = async () => {
      setLoading(true);
      try {
        const { tableManagementApi } = await import("@/lib/api/tableManagement");
        const res = await tableManagementApi.getColumnList(tableName);
        if (res.success && res.data?.columns) setColumns(res.data.columns);
      } catch { /* ignore */ } finally { setLoading(false); }
    };
    load();
  }, [tableName]);

  const selected = columns.find((c) => c.columnName === value);
  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button variant="outline" role="combobox" aria-expanded={open} className="mt-1 h-8 w-full justify-between text-xs" disabled={loading || !tableName}>
          <span className="truncate">
            {loading ? "로딩..." : !tableName ? "테이블 먼저 선택" : selected ? selected.displayName || selected.columnName : placeholder || "컬럼 선택"}
          </span>
          <ChevronsUpDown className="ml-2 h-3 w-3 shrink-0 opacity-50" />
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-[240px] p-0" align="start">
        <Command>
          <CommandInput placeholder="컬럼 검색..." className="text-xs" />
          <CommandList>
            <CommandEmpty className="py-4 text-center text-xs">컬럼을 찾을 수 없습니다.</CommandEmpty>
            <CommandGroup className="max-h-[200px] overflow-auto">
              {columns.map((c) => (
                <CommandItem key={c.columnName} value={`${c.displayName || ""} ${c.columnName}`}
                  onSelect={() => { onChange(c.columnName); setOpen(false); }} className="text-xs">
                  <Check className={cn("mr-2 h-3 w-3", value === c.columnName ? "opacity-100" : "opacity-0")} />
                  <div className="flex flex-col">
                    <span className="font-medium">{c.displayName || c.columnName}</span>
                    {c.displayName && <span className="text-[10px] text-muted-foreground">{c.columnName}</span>}
                  </div>
                </CommandItem>
              ))}
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  );
}

interface ConfigPanelProps {
  config: Partial<ProcessWorkStandardConfig>;
  onChange: (config: Partial<ProcessWorkStandardConfig>) => void;
}

export function ProcessWorkStandardConfigPanel({
  config: configProp,
  onChange,
}: ConfigPanelProps) {
  const [tables, setTables] = useState<TableInfo[]>([]);
  const [loadingTables, setLoadingTables] = useState(false);

  const config: ProcessWorkStandardConfig = {
    ...defaultConfig,
    ...configProp,
    dataSource: { ...defaultConfig.dataSource, ...configProp?.dataSource },
    phases: configProp?.phases?.length ? configProp.phases : defaultConfig.phases,
    detailTypes: configProp?.detailTypes?.length ? configProp.detailTypes : defaultConfig.detailTypes,
  };

  useEffect(() => {
    const loadTables = async () => {
      setLoadingTables(true);
      try {
        const { tableManagementApi } = await import("@/lib/api/tableManagement");
        const res = await tableManagementApi.getTableList();
        if (res.success && res.data) {
          setTables(res.data.map((t: any) => ({ tableName: t.tableName, displayName: t.displayName || t.tableName })));
        }
      } catch { /* ignore */ } finally { setLoadingTables(false); }
    };
    loadTables();
  }, []);

  const update = (partial: Partial<ProcessWorkStandardConfig>) => {
    onChange({ ...configProp, ...partial });
  };

  const updateDataSource = (field: string, value: string) => {
    update({
      dataSource: { ...config.dataSource, [field]: value },
    });
  };

  // 작업 단계 관리
  const addPhase = () => {
    const nextOrder = config.phases.length + 1;
    update({
      phases: [
        ...config.phases,
        { key: `PHASE_${nextOrder}`, label: `단계 ${nextOrder}`, sortOrder: nextOrder },
      ],
    });
  };

  const removePhase = (idx: number) => {
    update({ phases: config.phases.filter((_, i) => i !== idx) });
  };

  const updatePhase = (idx: number, field: keyof WorkPhaseDefinition, value: string | number) => {
    const next = [...config.phases];
    next[idx] = { ...next[idx], [field]: value };
    update({ phases: next });
  };

  // 상세 유형 관리
  const addDetailType = () => {
    update({
      detailTypes: [
        ...config.detailTypes,
        { value: `TYPE_${config.detailTypes.length + 1}`, label: "신규 유형" },
      ],
    });
  };

  const removeDetailType = (idx: number) => {
    update({ detailTypes: config.detailTypes.filter((_, i) => i !== idx) });
  };

  const updateDetailType = (idx: number, field: keyof DetailTypeDefinition, value: string) => {
    const next = [...config.detailTypes];
    next[idx] = { ...next[idx], [field]: value };
    update({ detailTypes: next });
  };

  return (
    <div className="space-y-5 p-4">
      <h3 className="text-sm font-semibold">공정 작업기준 설정</h3>

      {/* 품목 목록 모드 */}
      <section className="space-y-3">
        <p className="text-xs font-medium text-muted-foreground">품목 목록 모드</p>
        <div>
          <Select
            value={config.itemListMode || "all"}
            onValueChange={(v) => update({ itemListMode: v as "all" | "registered" })}
          >
            <SelectTrigger className="h-8 text-xs">
              <SelectValue />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="all">전체 품목</SelectItem>
              <SelectItem value="registered">등록 품목만</SelectItem>
            </SelectContent>
          </Select>
          <p className="mt-1 text-[10px] text-muted-foreground">
            {config.itemListMode === "registered"
              ? "품목별 라우팅 탭에서 등록한 품목만 표시됩니다. screenCode는 화면 ID 기준으로 자동 설정됩니다."
              : "모든 품목을 표시합니다."}
          </p>
        </div>
      </section>

      {/* 데이터 소스 설정 */}
      <section className="space-y-3">
        <p className="text-xs font-medium text-muted-foreground">데이터 소스 설정</p>

        <div>
          <Label className="text-xs">품목 테이블</Label>
          <TableCombobox value={config.dataSource.itemTable} onChange={(v) => updateDataSource("itemTable", v)} tables={tables} loading={loadingTables} />
        </div>
        <div className="grid grid-cols-2 gap-2">
          <div>
            <Label className="text-xs">품목명 컬럼</Label>
            <ColumnCombobox value={config.dataSource.itemNameColumn} onChange={(v) => updateDataSource("itemNameColumn", v)} tableName={config.dataSource.itemTable} placeholder="품목명" />
          </div>
          <div>
            <Label className="text-xs">품목코드 컬럼</Label>
            <ColumnCombobox value={config.dataSource.itemCodeColumn} onChange={(v) => updateDataSource("itemCodeColumn", v)} tableName={config.dataSource.itemTable} placeholder="품목코드" />
          </div>
        </div>

        <div>
          <Label className="text-xs">라우팅 버전 테이블</Label>
          <TableCombobox value={config.dataSource.routingVersionTable} onChange={(v) => updateDataSource("routingVersionTable", v)} tables={tables} loading={loadingTables} />
        </div>
        <div>
          <Label className="text-xs">품목 연결 FK 컬럼</Label>
          <ColumnCombobox value={config.dataSource.routingFkColumn} onChange={(v) => updateDataSource("routingFkColumn", v)} tableName={config.dataSource.routingVersionTable} placeholder="FK 컬럼" />
        </div>

        <div>
          <Label className="text-xs">공정 마스터 테이블</Label>
          <TableCombobox value={config.dataSource.processTable} onChange={(v) => updateDataSource("processTable", v)} tables={tables} loading={loadingTables} />
        </div>
        <div className="grid grid-cols-2 gap-2">
          <div>
            <Label className="text-xs">공정명 컬럼</Label>
            <ColumnCombobox value={config.dataSource.processNameColumn} onChange={(v) => updateDataSource("processNameColumn", v)} tableName={config.dataSource.processTable} placeholder="공정명" />
          </div>
          <div>
            <Label className="text-xs">공정코드 컬럼</Label>
            <ColumnCombobox value={config.dataSource.processCodeColumn} onChange={(v) => updateDataSource("processCodeColumn", v)} tableName={config.dataSource.processTable} placeholder="공정코드" />
          </div>
        </div>
      </section>

      {/* 작업 단계 설정 */}
      <section className="space-y-3">
        <div className="flex items-center justify-between">
          <p className="text-xs font-medium text-muted-foreground">작업 단계 설정</p>
          <Button variant="outline" size="sm" className="h-6 gap-1 text-[10px]" onClick={addPhase}>
            <Plus className="h-3 w-3" />
            단계 추가
          </Button>
        </div>

        <div className="space-y-1.5">
          {config.phases.map((phase, idx) => (
            <div
              key={idx}
              className="flex items-center gap-1.5 rounded border bg-muted/30 p-1.5"
            >
              <GripVertical className="h-3.5 w-3.5 shrink-0 text-muted-foreground/50" />
              <Input
                value={phase.key}
                onChange={(e) => updatePhase(idx, "key", e.target.value)}
                className="h-7 w-20 text-[10px]"
                placeholder="키"
              />
              <Input
                value={phase.label}
                onChange={(e) => updatePhase(idx, "label", e.target.value)}
                className="h-7 flex-1 text-[10px]"
                placeholder="표시명"
              />
              <Button
                variant="ghost"
                size="icon"
                className="h-6 w-6 shrink-0 text-destructive hover:text-destructive"
                onClick={() => removePhase(idx)}
                disabled={config.phases.length <= 1}
              >
                <Trash2 className="h-3 w-3" />
              </Button>
            </div>
          ))}
        </div>
      </section>

      {/* 상세 유형 옵션 */}
      <section className="space-y-3">
        <div className="flex items-center justify-between">
          <p className="text-xs font-medium text-muted-foreground">상세 유형 옵션</p>
          <Button
            variant="outline"
            size="sm"
            className="h-6 gap-1 text-[10px]"
            onClick={addDetailType}
          >
            <Plus className="h-3 w-3" />
            유형 추가
          </Button>
        </div>

        <div className="space-y-1.5">
          {config.detailTypes.map((dt, idx) => (
            <div key={idx} className="flex items-center gap-1.5 rounded border bg-muted/30 p-1.5">
              <Input
                value={dt.value}
                onChange={(e) => updateDetailType(idx, "value", e.target.value)}
                className="h-7 w-24 text-[10px]"
                placeholder="값"
              />
              <Input
                value={dt.label}
                onChange={(e) => updateDetailType(idx, "label", e.target.value)}
                className="h-7 flex-1 text-[10px]"
                placeholder="표시명"
              />
              <Button
                variant="ghost"
                size="icon"
                className="h-6 w-6 shrink-0 text-destructive hover:text-destructive"
                onClick={() => removeDetailType(idx)}
                disabled={config.detailTypes.length <= 1}
              >
                <Trash2 className="h-3 w-3" />
              </Button>
            </div>
          ))}
        </div>
      </section>

      {/* UI 설정 */}
      <section className="space-y-3">
        <p className="text-xs font-medium text-muted-foreground">UI 설정</p>

        <div>
          <Label className="text-xs">좌우 분할 비율 (%)</Label>
          <Input
            type="number"
            value={config.splitRatio || 30}
            onChange={(e) => update({ splitRatio: Number(e.target.value) })}
            min={15}
            max={50}
            className="mt-1 h-8 w-20 text-xs"
          />
        </div>

        <div>
          <Label className="text-xs">좌측 패널 제목</Label>
          <Input
            value={config.leftPanelTitle || ""}
            onChange={(e) => update({ leftPanelTitle: e.target.value })}
            className="mt-1 h-8 text-xs"
          />
        </div>

        <div className="flex items-center gap-2">
          <Switch
            checked={config.readonly || false}
            onCheckedChange={(v) => update({ readonly: v })}
          />
          <Label className="text-xs">읽기 전용 모드</Label>
        </div>
      </section>
    </div>
  );
}