import { useState, useCallback } from 'react';
import { useNetworks } from '@/hooks/use-networks';
import { cn, removeDuplicates } from '@/lib/utils';
import { metaKey } from '@/lib/platform';
import { useAuthStore } from '@/stores/auth-store';
import { generateRandomName } from '@/lib/random-name';
import { Input } from '@/components/ui/input';
import { KeyHint } from '@/components/key-hint';
import { Label } from '@/components/ui/label';
import { Checkbox } from '@/components/ui/checkbox';
import { ScrollArea } from '@/components/ui/scroll-area';

interface ConfigureStreamStepProps {
  networkId: string | null;
  onCancel: () => void;
  onSubmit: (streamName: string, visibleTo: string[]) => void;
}

export function ConfigureStreamStep({
  networkId,
  onCancel,
  onSubmit,
}: ConfigureStreamStepProps) {
  const { data: networks } = useNetworks();
  const network = networks?.find((n) => n.id === networkId);

  const [name, setName] = useState(() => generateRandomName());
  const [everyone, setEveryone] = useState(true);
  const userId = useAuthStore((s) => s.user?.id);
  const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set());

  const members = (network?.humans ?? []).filter((h) => h.id !== userId);

  const toggleMember = useCallback((id: string) => {
    setSelectedIds((prev) => {
      const next = new Set(prev);
      if (next.has(id)) next.delete(id);
      else next.add(id);
      return next;
    });
  }, []);

  const buildVisibleTo = useCallback((): string[] => {
    if (everyone && networkId) return [`network:${networkId}`];

    return Array.from(
      removeDuplicates([...selectedIds, userId].filter(Boolean) as string[]),
    ).map((id) => `human:${id}`);
  }, [everyone, networkId, selectedIds, userId]);

  const handleSubmit = useCallback(() => {
    if (!name.trim() || !networkId) return;
    onSubmit(name.trim(), buildVisibleTo());
  }, [name, networkId, onSubmit, buildVisibleTo]);

  const handleKeyDown = useCallback(
    (e: React.KeyboardEvent) => {
      switch (e.key) {
        case 'Escape':
          e.preventDefault();
          onCancel();
          return;

        case 'Enter':
          if (e.metaKey || e.ctrlKey) {
            e.preventDefault();
            handleSubmit();
          }
          return;
      }
    },
    [onCancel, handleSubmit],
  );

  return (
    <div
      className="absolute inset-0 z-50 flex flex-col bg-black/90 pt-16"
      onKeyDown={handleKeyDown}
      tabIndex={-1}
    >
      <div className="mx-auto w-full max-w-sm space-y-4 px-6">
        {/* Stream name */}
        <div>
          <Label className="mb-1 text-xs text-white/50">Stream name</Label>
          <Input
            type="text"
            autoFocus
            value={name}
            onChange={(e) => {
              setName(e.target.value);
            }}
            placeholder="Give it a name..."
            className="border-white/10 bg-white/5 text-white placeholder-white/30 focus-visible:border-white/30 focus-visible:ring-0"
          />
        </div>

        {/* Visibility */}
        <div>
          <Label className="mb-1 text-xs text-white/50">Visible to</Label>
          <div className="rounded-md border border-white/10">
            {/* Everyone in network */}
            <div
              role="button"
              onClick={() => setEveryone((prev) => !prev)}
              className={cn(
                'flex w-full cursor-pointer items-center gap-2.5 px-3 py-2 text-left text-sm transition-colors',
                'text-white/70 hover:bg-white/5',
              )}
            >
              <Checkbox
                checked={everyone}
                onCheckedChange={(checked) => setEveryone(checked === true)}
                tabIndex={-1}
                className="pointer-events-none"
              />
              <span className="font-medium">Everyone in network</span>
            </div>

            {/* Per-member selection */}
            {!everyone && members.length > 0 && (
              <ScrollArea className="max-h-48">
                <div className="space-y-0.5 p-1">
                  {members.map((member) => {
                    const isSelected = selectedIds.has(member.id);
                    const initials = member.email_prefix
                      .slice(0, 2)
                      .toUpperCase();

                    return (
                      <div
                        key={member.id}
                        role="button"
                        onClick={() => toggleMember(member.id)}
                        className={cn(
                          'flex w-full cursor-pointer items-center gap-2.5 rounded px-3 py-1.5 text-left text-sm transition-colors',
                          'text-white/70 hover:bg-white/5',
                        )}
                      >
                        <Checkbox
                          checked={isSelected}
                          tabIndex={-1}
                          className="pointer-events-none"
                        />
                        <span className="flex h-6 w-6 items-center justify-center rounded-full bg-white/10 text-[10px] font-medium">
                          {initials}
                        </span>
                        <span className="flex-1 truncate">
                          {member.email_prefix}
                        </span>
                      </div>
                    );
                  })}
                </div>
              </ScrollArea>
            )}
          </div>
        </div>
      </div>

      {/* Keyboard hints */}
      <div className="absolute bottom-8 left-0 right-0 flex items-center justify-center gap-4 text-sm text-white/50">
        <KeyHint keys="Esc" onClick={onCancel} title="Cancel (or press Esc)">
          cancel
        </KeyHint>
        <KeyHint
          keys={`${metaKey}+Enter`}
          onClick={handleSubmit}
          title={`Create stream (or press ${metaKey}+Enter)`}
        >
          create
        </KeyHint>
      </div>
    </div>
  );
}