"use client";

import React from "react";
import { BaseLayoutRenderer, LayoutRendererProps } from "./BaseLayoutRenderer";

export default class GridLayoutRenderer extends BaseLayoutRenderer {
  render(): React.ReactElement {
    const { layout, isDesignMode, isSelected, onClick, className } = this.props;

    if (!layout.layoutConfig.grid) {
      return <div className="error-layout">그리드 설정이 없습니다.</div>;
    }

    const gridConfig = layout.layoutConfig.grid;
    const containerStyle = this.getLayoutContainerStyle();

    // 그리드 스타일 설정
    const gridStyle: React.CSSProperties = {
      ...containerStyle,
      display: "grid",
      gridTemplateRows: `repeat(${gridConfig.rows}, 1fr)`,
      gridTemplateColumns: `repeat(${gridConfig.columns}, 1fr)`,
      gap: `${gridConfig.gap}px`,
      gridRowGap: gridConfig.rowGap ? `${gridConfig.rowGap}px` : undefined,
      gridColumnGap: gridConfig.columnGap ? `${gridConfig.columnGap}px` : undefined,
      gridAutoRows: gridConfig.autoRows,
      gridAutoColumns: gridConfig.autoColumns,
    };

    // 디자인 모드 스타일
    if (isDesignMode) {
      gridStyle.border = isSelected ? "2px solid #3b82f6" : "1px solid #e2e8f0";
      gridStyle.borderRadius = "8px";
    }

    return (
      <div
        className={`grid-layout ${isDesignMode ? "design-mode" : ""} ${className || ""}`}
        style={gridStyle}
        onClick={onClick}
        draggable={isDesignMode}
        onDragStart={this.props.onDragStart}
        onDragEnd={this.props.onDragEnd}
      >
        {layout.zones.map((zone) => {
          const zoneChildren = this.getZoneChildren(zone.id);

          // 그리드 위치 설정
          const zoneStyle: React.CSSProperties = {
            gridRow: zone.position.row !== undefined ? zone.position.row + 1 : undefined,
            gridColumn: zone.position.column !== undefined ? zone.position.column + 1 : undefined,
          };

          return this.renderZone(zone, zoneChildren, {
            style: zoneStyle,
            className: "grid-zone",
          });
        })}

        {/* 디자인 모드에서 빈 그리드 셀 표시 */}
        {isDesignMode && this.renderEmptyGridCells()}
      </div>
    );
  }

  /**
   * 빈 그리드 셀들을 렌더링합니다.
   */
  private renderEmptyGridCells(): React.ReactElement[] {
    const { layout } = this.props;
    const gridConfig = layout.layoutConfig.grid!;
    const totalCells = gridConfig.rows * gridConfig.columns;
    const occupiedCells = new Set(
      layout.zones
        .map((zone) =>
          zone.position.row !== undefined && zone.position.column !== undefined
            ? zone.position.row * gridConfig.columns + zone.position.column
            : -1,
        )
        .filter((index) => index >= 0),
    );

    const emptyCells: React.ReactElement[] = [];

    for (let i = 0; i < totalCells; i++) {
      if (!occupiedCells.has(i)) {
        const row = Math.floor(i / gridConfig.columns);
        const column = i % gridConfig.columns;

        emptyCells.push(
          <div
            key={`empty-${i}`}
            className="empty-grid-cell"
            style={{
              gridRow: row + 1,
              gridColumn: column + 1,
              border: isDesignMode ? "1px dashed #cbd5e1" : "1px solid #f1f5f9",
              borderRadius: "4px",
              backgroundColor: isDesignMode ? "rgba(148, 163, 184, 0.05)" : "rgba(248, 250, 252, 0.3)",
              display: "flex",
              alignItems: "center",
              justifyContent: "center",
              fontSize: "10px",
              color: "#94a3b8",
              minHeight: "40px",
              transition: "all 0.2s ease",
            }}
            onMouseEnter={(e) => {
              e.currentTarget.style.backgroundColor = "rgba(59, 130, 246, 0.05)";
              e.currentTarget.style.borderColor = "#3b82f6";
            }}
            onMouseLeave={(e) => {
              e.currentTarget.style.backgroundColor = isDesignMode
                ? "rgba(148, 163, 184, 0.05)"
                : "rgba(248, 250, 252, 0.3)";
              e.currentTarget.style.borderColor = isDesignMode ? "#cbd5e1" : "#f1f5f9";
            }}
          >
            {isDesignMode ? `${row + 1},${column + 1}` : ""}
          </div>,
        );
      }
    }

    return emptyCells;
  }
}

// React 컴포넌트로 래핑
export const GridLayout: React.FC<LayoutRendererProps> = (props) => {
  const renderer = new GridLayoutRenderer(props);
  return renderer.render();
};