'use client';

import { useState } from 'react';
import { Button } from '@/components/ui/button';
import { Select } from '@/components/ui/select';
import { Input } from '@/components/ui/input';
import { PaletteGrid } from '@/components/color/PaletteGrid';
import { ExportMenu } from '@/components/tools/ExportMenu';
import { useLighten, useDarken, useSaturate, useDesaturate, useRotate } from '@/lib/api/queries';
import { Loader2, Upload, Download } from 'lucide-react';
import { toast } from 'sonner';

type Operation = 'lighten' | 'darken' | 'saturate' | 'desaturate' | 'rotate';

export default function BatchPage() {
  const [inputColors, setInputColors] = useState('');
  const [operation, setOperation] = useState<Operation>('lighten');
  const [amount, setAmount] = useState(0.2);
  const [outputColors, setOutputColors] = useState<string[]>([]);

  const lightenMutation = useLighten();
  const darkenMutation = useDarken();
  const saturateMutation = useSaturate();
  const desaturateMutation = useDesaturate();
  const rotateMutation = useRotate();

  const parseColors = (text: string): string[] => {
    // Parse colors from text (one per line, or comma-separated)
    return text
      .split(/[\n,]/)
      .map((c) => c.trim())
      .filter((c) => c.length > 0 && c.match(/^#?[0-9a-fA-F]{3,8}$/));
  };

  const handleProcess = async () => {
    const colors = parseColors(inputColors);

    if (colors.length === 0) {
      toast.error('No valid colors found');
      return;
    }

    if (colors.length > 100) {
      toast.error('Maximum 100 colors allowed');
      return;
    }

    try {
      let result;

      switch (operation) {
        case 'lighten':
          result = await lightenMutation.mutateAsync({ colors, amount });
          break;
        case 'darken':
          result = await darkenMutation.mutateAsync({ colors, amount });
          break;
        case 'saturate':
          result = await saturateMutation.mutateAsync({ colors, amount });
          break;
        case 'desaturate':
          result = await desaturateMutation.mutateAsync({ colors, amount });
          break;
        case 'rotate':
          result = await rotateMutation.mutateAsync({ colors, amount: amount * 360 });
          break;
      }

      // Extract output colors from the result
      const processed = result.colors.map((c) => c.output);
      setOutputColors(processed);
      toast.success(`Processed ${processed.length} colors`);
    } catch (error) {
      toast.error('Failed to process colors');
      console.error(error);
    }
  };

  const isPending =
    lightenMutation.isPending ||
    darkenMutation.isPending ||
    saturateMutation.isPending ||
    desaturateMutation.isPending ||
    rotateMutation.isPending;

  return (
    <div className="min-h-screen px-8 py-12">
      <div className="max-w-7xl mx-auto space-y-8">
        <div>
          <h1 className="text-4xl font-bold mb-2">Batch Operations</h1>
          <p className="text-muted-foreground">
            Process multiple colors at once with manipulation operations
          </p>
        </div>

        <div className="grid grid-cols-1 lg:grid-cols-2 gap-8">
          {/* Input */}
          <div className="space-y-6">
            <div className="p-6 border rounded-lg bg-card">
              <h2 className="text-xl font-semibold mb-4">Input Colors</h2>
              <p className="text-sm text-muted-foreground mb-4">
                Enter colors (one per line or comma-separated). Supports hex format.
              </p>

              <textarea
                value={inputColors}
                onChange={(e) => setInputColors(e.target.value)}
                placeholder="#ff0099, #00ff99, #9900ff&#10;#ff5533&#10;#3355ff"
                className="w-full h-48 p-3 border rounded-lg bg-background font-mono text-sm"
              />

              <p className="text-xs text-muted-foreground mt-2">
                {parseColors(inputColors).length} valid colors found
              </p>
            </div>

            <div className="p-6 border rounded-lg bg-card">
              <h2 className="text-xl font-semibold mb-4">Operation</h2>
              <div className="space-y-4">
                <Select
                  label="Operation"
                  value={operation}
                  onChange={(e) => setOperation(e.target.value as Operation)}
                >
                  <option value="lighten">Lighten</option>
                  <option value="darken">Darken</option>
                  <option value="saturate">Saturate</option>
                  <option value="desaturate">Desaturate</option>
                  <option value="rotate">Rotate Hue</option>
                </Select>

                <div>
                  <label className="text-sm font-medium mb-2 block">
                    Amount: {operation === 'rotate' ? (amount * 360).toFixed(0) + '°' : (amount * 100).toFixed(0) + '%'}
                  </label>
                  <Input
                    type="range"
                    min="0"
                    max="1"
                    step="0.01"
                    value={amount}
                    onChange={(e) => setAmount(parseFloat(e.target.value))}
                  />
                </div>

                <Button
                  onClick={handleProcess}
                  disabled={isPending || parseColors(inputColors).length === 0}
                  className="w-full"
                >
                  {isPending ? (
                    <>
                      <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                      Processing...
                    </>
                  ) : (
                    <>
                      <Upload className="mr-2 h-4 w-4" />
                      Process Colors
                    </>
                  )}
                </Button>
              </div>
            </div>
          </div>

          {/* Output */}
          <div className="space-y-6">
            {outputColors.length > 0 ? (
              <>
                <div className="p-6 border rounded-lg bg-card">
                  <h2 className="text-xl font-semibold mb-4">
                    Output Colors ({outputColors.length})
                  </h2>
                  <PaletteGrid colors={outputColors} />
                </div>

                <div className="p-6 border rounded-lg bg-card">
                  <ExportMenu colors={outputColors} />
                </div>
              </>
            ) : (
              <div className="p-12 border rounded-lg bg-card text-center text-muted-foreground">
                <Download className="h-12 w-12 mx-auto mb-4 opacity-50" />
                <p>Enter colors and click Process to see results</p>
              </div>
            )}
          </div>
        </div>
      </div>
    </div>
  );
}