"use client";

import { Label } from "@/components/ui/label";
import { BranchAutocomplete } from "@/components/ui/branch-autocomplete";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { cn } from "@/lib/utils";

interface BranchSelectorProps {
  useCurrentBranch: boolean;
  onUseCurrentBranchChange: (useCurrent: boolean) => void;
  branchName: string;
  onBranchNameChange: (branchName: string) => void;
  branchSuggestions: string[];
  currentBranch?: string;
  disabled?: boolean;
  testIdPrefix?: string;
}

export function BranchSelector({
  useCurrentBranch,
  onUseCurrentBranchChange,
  branchName,
  onBranchNameChange,
  branchSuggestions,
  currentBranch,
  disabled = false,
  testIdPrefix = "branch",
}: BranchSelectorProps) {
  // Validate: if "other branch" is selected, branch name is required
  const isBranchRequired = !useCurrentBranch;
  const hasError = isBranchRequired && !branchName.trim();

  return (
    <div className="space-y-2">
      <Label htmlFor={`${testIdPrefix}-selector`}>Target Branch</Label>
      <RadioGroup
        value={useCurrentBranch ? "current" : "other"}
        onValueChange={(value) => onUseCurrentBranchChange(value === "current")}
        disabled={disabled}
        data-testid={`${testIdPrefix}-radio-group`}
      >
        <div className="flex items-center space-x-2">
          <RadioGroupItem value="current" id={`${testIdPrefix}-current`} />
          <Label
            htmlFor={`${testIdPrefix}-current`}
            className="font-normal cursor-pointer"
          >
            Use current selected branch
            {currentBranch && (
              <span className="text-muted-foreground ml-1">
                ({currentBranch})
              </span>
            )}
          </Label>
        </div>
        <div className="flex items-center space-x-2">
          <RadioGroupItem value="other" id={`${testIdPrefix}-other`} />
          <Label
            htmlFor={`${testIdPrefix}-other`}
            className="font-normal cursor-pointer"
          >
            Other branch
          </Label>
        </div>
      </RadioGroup>
      {!useCurrentBranch && (
        <div className="ml-6 space-y-1">
          <BranchAutocomplete
            value={branchName}
            onChange={onBranchNameChange}
            branches={branchSuggestions}
            placeholder="Select or create branch..."
            data-testid={`${testIdPrefix}-input`}
            disabled={disabled}
            error={hasError}
          />
          {hasError && (
            <p className="text-xs text-destructive">
              Branch name is required when "Other branch" is selected.
            </p>
          )}
        </div>
      )}
      {disabled ? (
        <p className="text-xs text-muted-foreground">
          Branch cannot be changed after work has started.
        </p>
      ) : (
        <p className="text-xs text-muted-foreground">
          {useCurrentBranch
            ? "Work will be done in the currently selected branch. A worktree will be created if needed."
            : "Work will be done in this branch. A worktree will be created if needed."}
        </p>
      )}
    </div>
  );
}