'use client';

import { useState } from 'react';
import { useSelectionStore } from '@/store/selection-store';
import { useToolStore } from '@/store/tool-store';
import { useHistoryStore } from '@/store/history-store';
import {
  copySelection,
  cutSelection,
  deleteSelection,
  fillSelection,
  strokeSelection,
  pasteCanvas,
} from '@/lib/selection-operations';
import {
  ClearSelectionCommand,
  InvertSelectionCommand,
} from '@/core/commands/selection-command';
import type { SelectionType, SelectionMode } from '@/types/selection';
import {
  Square,
  Circle,
  Lasso,
  Wand2,
  Copy,
  Scissors,
  Trash2,
  FlipVertical,
  X,
  PlusSquare,
  MinusSquare,
  Layers,
  Paintbrush,
  Clipboard,
} from 'lucide-react';
import { cn } from '@/lib/utils';

const SELECTION_TOOLS: Array<{
  type: SelectionType;
  label: string;
  icon: React.ComponentType<{ className?: string }>;
}> = [
  { type: 'rectangular', label: 'Rectangle', icon: Square },
  { type: 'elliptical', label: 'Ellipse', icon: Circle },
  { type: 'lasso', label: 'Lasso', icon: Lasso },
  { type: 'magic-wand', label: 'Magic Wand', icon: Wand2 },
];

const SELECTION_MODES: Array<{
  mode: SelectionMode;
  label: string;
  icon: React.ComponentType<{ className?: string }>;
}> = [
  { mode: 'new', label: 'New', icon: Square },
  { mode: 'add', label: 'Add', icon: PlusSquare },
  { mode: 'subtract', label: 'Subtract', icon: MinusSquare },
  { mode: 'intersect', label: 'Intersect', icon: Layers },
];

export function SelectionPanel() {
  const {
    activeSelection,
    selectionType,
    selectionMode,
    feather,
    tolerance,
    setSelectionType,
    setSelectionMode,
    setFeather,
    setTolerance,
    clearSelection,
    invertSelection,
  } = useSelectionStore();

  const { setActiveTool, settings } = useToolStore();
  const { executeCommand } = useHistoryStore();
  const [copiedCanvas, setCopiedCanvas] = useState<HTMLCanvasElement | null>(
    null
  );

  const hasSelection = !!activeSelection;

  const handleToolSelect = (type: SelectionType) => {
    setSelectionType(type);
    setActiveTool('select');
  };

  const handleCopy = () => {
    const canvas = copySelection();
    if (canvas) {
      setCopiedCanvas(canvas);
    }
  };

  const handleCut = () => {
    const canvas = cutSelection();
    if (canvas) {
      setCopiedCanvas(canvas);
    }
  };

  const handlePaste = () => {
    if (copiedCanvas) {
      pasteCanvas(copiedCanvas);
    }
  };

  const handleDelete = () => {
    deleteSelection();
  };

  const handleClear = () => {
    const command = new ClearSelectionCommand();
    executeCommand(command);
  };

  const handleInvert = () => {
    const command = new InvertSelectionCommand();
    executeCommand(command);
  };

  const handleFill = () => {
    fillSelection(settings.color);
  };

  const handleStroke = () => {
    strokeSelection(settings.color, 2);
  };

  return (
    <div className="w-64 border-l border-border bg-card flex flex-col">
      {/* Header */}
      <div className="flex items-center gap-2 border-b border-border p-3">
        <Square className="h-5 w-5 text-primary" />
        <h2 className="text-sm font-semibold">Selection</h2>
      </div>

      {/* Selection Tools */}
      <div className="border-b border-border p-3">
        <h3 className="text-xs font-semibold text-muted-foreground uppercase mb-2">
          Tools
        </h3>
        <div className="grid grid-cols-2 gap-1">
          {SELECTION_TOOLS.map((tool) => (
            <button
              key={tool.type}
              onClick={() => handleToolSelect(tool.type)}
              className={cn(
                'flex items-center gap-2 rounded-md p-2 text-xs transition-colors',
                selectionType === tool.type
                  ? 'bg-primary text-primary-foreground'
                  : 'hover:bg-accent text-foreground'
              )}
            >
              <tool.icon className="h-4 w-4" />
              <span>{tool.label}</span>
            </button>
          ))}
        </div>
      </div>

      {/* Selection Modes */}
      <div className="border-b border-border p-3">
        <h3 className="text-xs font-semibold text-muted-foreground uppercase mb-2">
          Mode
        </h3>
        <div className="grid grid-cols-2 gap-1">
          {SELECTION_MODES.map((mode) => (
            <button
              key={mode.mode}
              onClick={() => setSelectionMode(mode.mode)}
              className={cn(
                'flex items-center gap-2 rounded-md p-2 text-xs transition-colors',
                selectionMode === mode.mode
                  ? 'bg-primary text-primary-foreground'
                  : 'hover:bg-accent text-foreground'
              )}
            >
              <mode.icon className="h-3 w-3" />
              <span>{mode.label}</span>
            </button>
          ))}
        </div>
      </div>

      {/* Selection Parameters */}
      <div className="border-b border-border p-3 space-y-3">
        <h3 className="text-xs font-semibold text-muted-foreground uppercase">
          Parameters
        </h3>

        {/* Feather */}
        <div className="space-y-2">
          <label className="text-xs text-foreground">Feather</label>
          <input
            type="range"
            min="0"
            max="250"
            value={feather}
            onChange={(e) => setFeather(Number(e.target.value))}
            className="w-full"
          />
          <div className="text-xs text-muted-foreground text-center">
            {feather}px
          </div>
        </div>

        {/* Tolerance (for magic wand) */}
        {selectionType === 'magic-wand' && (
          <div className="space-y-2">
            <label className="text-xs text-foreground">Tolerance</label>
            <input
              type="range"
              min="0"
              max="255"
              value={tolerance}
              onChange={(e) => setTolerance(Number(e.target.value))}
              className="w-full"
            />
            <div className="text-xs text-muted-foreground text-center">
              {tolerance}
            </div>
          </div>
        )}
      </div>

      {/* Selection Operations */}
      <div className="flex-1 overflow-y-auto p-3 space-y-2">
        <h3 className="text-xs font-semibold text-muted-foreground uppercase mb-2">
          Operations
        </h3>

        <button
          onClick={handleCopy}
          disabled={!hasSelection}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            hasSelection
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <Copy className="h-4 w-4" />
          <span>Copy</span>
          <span className="ml-auto text-xs text-muted-foreground">Ctrl+C</span>
        </button>

        <button
          onClick={handleCut}
          disabled={!hasSelection}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            hasSelection
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <Scissors className="h-4 w-4" />
          <span>Cut</span>
          <span className="ml-auto text-xs text-muted-foreground">Ctrl+X</span>
        </button>

        <button
          onClick={handlePaste}
          disabled={!copiedCanvas}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            copiedCanvas
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <Clipboard className="h-4 w-4" />
          <span>Paste</span>
          <span className="ml-auto text-xs text-muted-foreground">Ctrl+V</span>
        </button>

        <button
          onClick={handleDelete}
          disabled={!hasSelection}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            hasSelection
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <Trash2 className="h-4 w-4" />
          <span>Delete</span>
          <span className="ml-auto text-xs text-muted-foreground">Del</span>
        </button>

        <div className="h-px bg-border my-2" />

        <button
          onClick={handleFill}
          disabled={!hasSelection}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            hasSelection
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <Paintbrush className="h-4 w-4" />
          <span>Fill Selection</span>
        </button>

        <button
          onClick={handleStroke}
          disabled={!hasSelection}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            hasSelection
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <Paintbrush className="h-4 w-4" />
          <span>Stroke Selection</span>
        </button>

        <div className="h-px bg-border my-2" />

        <button
          onClick={handleInvert}
          disabled={!hasSelection}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            hasSelection
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <FlipVertical className="h-4 w-4" />
          <span>Invert Selection</span>
          <span className="ml-auto text-xs text-muted-foreground">
            Ctrl+Shift+I
          </span>
        </button>

        <button
          onClick={handleClear}
          disabled={!hasSelection}
          className={cn(
            'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
            hasSelection
              ? 'hover:bg-accent text-foreground'
              : 'text-muted-foreground cursor-not-allowed'
          )}
        >
          <X className="h-4 w-4" />
          <span>Clear Selection</span>
          <span className="ml-auto text-xs text-muted-foreground">
            Ctrl+D
          </span>
        </button>
      </div>

      {!hasSelection && (
        <div className="p-3 border-t border-border">
          <p className="text-xs text-muted-foreground text-center">
            Use selection tools to create a selection
          </p>
        </div>
      )}
    </div>
  );
}