import React, { useState, useEffect, useRef } from "react";
import { Button } from "@/components/ui/button.tsx";
import { Input } from "@/components/ui/input.tsx";
import { FormControl, FormItem, FormLabel } from "@/components/ui/form.tsx";
import { getCredentials } from "@/ui/main-axios.ts";
import { useTranslation } from "react-i18next";
import type { Credential } from "../../../../types";

interface CredentialSelectorProps {
  value?: number | null;
  onValueChange: (credentialId: number | null) => void;
  onCredentialSelect?: (credential: Credential | null) => void;
}

export function CredentialSelector({
  value,
  onValueChange,
  onCredentialSelect,
}: CredentialSelectorProps) {
  const { t } = useTranslation();
  const [credentials, setCredentials] = useState<Credential[]>([]);
  const [loading, setLoading] = useState(true);
  const [dropdownOpen, setDropdownOpen] = useState(false);
  const [searchQuery, setSearchQuery] = useState("");

  const buttonRef = useRef<HTMLButtonElement>(null);
  const dropdownRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const fetchCredentials = async () => {
      try {
        setLoading(true);
        const data = await getCredentials();
        const credentialsArray = Array.isArray(data)
          ? data
          : data.credentials || data.data || [];
        setCredentials(credentialsArray);
      } catch {
        const { toast } = await import("sonner");
        toast.error(t("credentials.failedToFetchCredentials"));
        setCredentials([]);
      } finally {
        setLoading(false);
      }
    };

    fetchCredentials();
  }, []);

  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      if (
        dropdownRef.current &&
        !dropdownRef.current.contains(event.target as Node) &&
        buttonRef.current &&
        !buttonRef.current.contains(event.target as Node)
      ) {
        setDropdownOpen(false);
      }
    }

    if (dropdownOpen) {
      document.addEventListener("mousedown", handleClickOutside);
    } else {
      document.removeEventListener("mousedown", handleClickOutside);
    }

    return () => {
      document.removeEventListener("mousedown", handleClickOutside);
    };
  }, [dropdownOpen]);

  const selectedCredential = credentials.find((c) => c.id === value);

  const filteredCredentials = credentials.filter((credential) => {
    if (!searchQuery) return true;
    const searchLower = searchQuery.toLowerCase();
    return (
      credential.name.toLowerCase().includes(searchLower) ||
      credential.username.toLowerCase().includes(searchLower) ||
      (credential.folder &&
        credential.folder.toLowerCase().includes(searchLower))
    );
  });

  const handleCredentialSelect = (credential: Credential) => {
    onValueChange(credential.id);
    if (onCredentialSelect) {
      onCredentialSelect(credential);
    }
    setDropdownOpen(false);
    setSearchQuery("");
  };

  const handleClear = () => {
    onValueChange(null);
    if (onCredentialSelect) {
      onCredentialSelect(null);
    }
    setDropdownOpen(false);
    setSearchQuery("");
  };

  return (
    <FormItem>
      <FormLabel>{t("hosts.selectCredential")}</FormLabel>
      <FormControl>
        <div className="relative">
          <Button
            ref={buttonRef}
            type="button"
            variant="outline"
            className="w-full justify-between text-left rounded-lg px-3 py-2 bg-muted/50 focus:bg-background focus:ring-1 focus:ring-ring border border-border text-foreground transition-all duration-200"
            onClick={() => setDropdownOpen(!dropdownOpen)}
          >
            {loading ? (
              t("common.loading")
            ) : value === "existing_credential" ? (
              <div className="flex items-center justify-between w-full">
                <div>
                  <span className="font-medium">
                    {t("hosts.existingCredential")}
                  </span>
                </div>
              </div>
            ) : selectedCredential ? (
              <div className="flex items-center justify-between w-full">
                <div>
                  <span className="font-medium">{selectedCredential.name}</span>
                  <span className="text-sm text-muted-foreground ml-2">
                    ({selectedCredential.username} •{" "}
                    {selectedCredential.authType})
                  </span>
                </div>
              </div>
            ) : (
              t("hosts.selectCredentialPlaceholder")
            )}
            <svg
              className="h-4 w-4"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M19 9l-7 7-7-7"
              />
            </svg>
          </Button>

          {dropdownOpen && (
            <div
              ref={dropdownRef}
              className="absolute top-full left-0 z-50 mt-1 w-full bg-card border border-border rounded-lg shadow-lg max-h-80 overflow-hidden backdrop-blur-sm"
            >
              <div className="p-2 border-b border-border">
                <Input
                  placeholder={t("credentials.searchCredentials")}
                  value={searchQuery}
                  onChange={(e) => setSearchQuery(e.target.value)}
                  className="h-8"
                />
              </div>

              <div className="max-h-60 overflow-y-auto p-2">
                {loading ? (
                  <div className="p-3 text-center text-sm text-muted-foreground">
                    {t("common.loading")}
                  </div>
                ) : filteredCredentials.length === 0 ? (
                  <div className="p-3 text-center text-sm text-muted-foreground">
                    {searchQuery
                      ? t("credentials.noCredentialsMatchFilters")
                      : t("credentials.noCredentialsYet")}
                  </div>
                ) : (
                  <div className="grid grid-cols-1 gap-2.5">
                    {value && (
                      <Button
                        type="button"
                        variant="ghost"
                        size="sm"
                        className="w-full justify-start text-left rounded-lg px-3 py-2 text-destructive hover:bg-destructive/10 transition-colors duration-200"
                        onClick={handleClear}
                      >
                        {t("common.clear")}
                      </Button>
                    )}
                    {filteredCredentials.map((credential) => (
                      <Button
                        key={credential.id}
                        type="button"
                        variant="ghost"
                        size="sm"
                        className={`w-full justify-start text-left rounded-lg px-3 py-7 hover:bg-muted focus:bg-muted focus:outline-none transition-colors duration-200 ${
                          credential.id === value ? "bg-muted" : ""
                        }`}
                        onClick={() => handleCredentialSelect(credential)}
                      >
                        <div className="w-full">
                          <div className="flex items-center justify-between">
                            <span className="font-medium">
                              {credential.name}
                            </span>
                          </div>
                          <div className="text-xs text-muted-foreground mt-0.5">
                            {credential.username} • {credential.authType}
                            {credential.description &&
                              ` • ${credential.description}`}
                          </div>
                        </div>
                      </Button>
                    ))}
                  </div>
                )}
              </div>
            </div>
          )}
        </div>
      </FormControl>
    </FormItem>
  );
}