import React, { useState, useEffect } from "react";
import {
  PrimaryButton,
  DefaultButton,
  TextField,
  Dropdown,
  IDropdownOption,
  Stack,
  Text,
  Toggle,
  Spinner,
  SpinnerSize,
  MessageBar,
  MessageBarType,
} from "@fluentui/react";
import {
  SyncProfile,
  StarfaceConnection,
  StarfaceAddressBook,
  OutlookContactFolder,
} from "../../models/types";
import { ProfileManager } from "../../services/profile-manager";
import { SyncEngine } from "../../services/sync-engine";

interface Props {
  profile: SyncProfile | null;
  onSave: () => void;
  onCancel: () => void;
}

const defaultConnection: StarfaceConnection = {
  host: "",
  port: 443,
  useSsl: true,
  loginId: "",
  password: "",
};

export const ProfileEditor: React.FC<Props> = ({
  profile,
  onSave,
  onCancel,
}) => {
  const pm = new ProfileManager();
  const engine = new SyncEngine();
  const isNew = !profile;

  const [name, setName] = useState(profile?.name || "");
  const [connection, setConnection] = useState<StarfaceConnection>(
    profile?.starfaceConnection || { ...defaultConnection }
  );
  const [addressBooks, setAddressBooks] = useState<StarfaceAddressBook[]>([]);
  const [selectedBook, setSelectedBook] = useState<StarfaceAddressBook | null>(
    profile?.starfaceAddressBook || null
  );
  const [outlookFolders, setOutlookFolders] = useState<OutlookContactFolder[]>(
    []
  );
  const [selectedFolderId, setSelectedFolderId] = useState(
    profile?.outlookFolderId || ""
  );
  const [syncDirection, setSyncDirection] = useState<SyncProfile["syncDirection"]>(
    profile?.syncDirection || "both"
  );
  const [enabled, setEnabled] = useState(profile?.enabled ?? true);

  const [loading, setLoading] = useState(false);
  const [testResult, setTestResult] = useState<{
    success: boolean;
    message: string;
  } | null>(null);
  const [error, setError] = useState("");

  // Load Outlook folders on mount
  useEffect(() => {
    loadOutlookFolders();
  }, []);

  const loadOutlookFolders = async () => {
    try {
      const folders = await engine.loadOutlookFolders();
      setOutlookFolders(folders);
      if (!selectedFolderId && folders.length > 0) {
        setSelectedFolderId(folders[0].id);
      }
    } catch (err) {
      console.error("Failed to load Outlook folders:", err);
      // Provide a default folder option
      setOutlookFolders([{ id: "default", displayName: "Kontakte (Standard)" }]);
      if (!selectedFolderId) setSelectedFolderId("default");
    }
  };

  const handleTestConnection = async () => {
    setLoading(true);
    setTestResult(null);
    const result = await engine.testStarfaceConnection(connection);
    setTestResult(result);
    if (!result.success && result.message.toLowerCase().includes("fetch")) {
      result.message +=
        "\n\nMögliche Ursache: Das SSL-Zertifikat der Starface ist nicht vertrauenswürdig. " +
        "Bitte als Administrator ausführen:\n" +
        `import-cert.ps1 -StarfaceHost ${connection.host} -Port ${connection.port}`;
    }
    setLoading(false);
  };

  const handleLoadAddressBooks = async () => {
    setLoading(true);
    setError("");
    try {
      const books = await engine.loadStarfaceAddressBooks(connection);
      setAddressBooks(books);
      if (books.length > 0 && !selectedBook) {
        setSelectedBook(books[0]);
      }
      if (books.length === 0) {
        setError("Keine Adressbücher gefunden");
      }
    } catch (err) {
      setError(`Fehler: ${err}`);
    }
    setLoading(false);
  };

  const handleSave = () => {
    if (!name.trim()) {
      setError("Bitte einen Profilnamen eingeben");
      return;
    }
    if (!connection.host.trim()) {
      setError("Bitte Starface-Host eingeben");
      return;
    }
    if (!selectedBook) {
      setError("Bitte ein Starface-Adressbuch auswählen");
      return;
    }
    if (!selectedFolderId) {
      setError("Bitte einen Outlook-Ordner auswählen");
      return;
    }

    const selectedFolder = outlookFolders.find(
      (f) => f.id === selectedFolderId
    );

    const newProfile: SyncProfile = {
      id: profile?.id || pm.generateId(),
      name: name.trim(),
      starfaceConnection: connection,
      starfaceAddressBook: selectedBook,
      outlookFolderId: selectedFolderId,
      outlookFolderName:
        selectedFolder?.displayName || "Kontakte",
      syncDirection,
      lastSync: profile?.lastSync,
      enabled,
    };

    if (isNew) {
      pm.addProfile(newProfile);
    } else {
      pm.updateProfile(newProfile);
    }

    onSave();
  };

  const directionOptions: IDropdownOption[] = [
    { key: "both", text: "Bidirektional (↔)" },
    { key: "outlook-to-starface", text: "Outlook → Starface" },
    { key: "starface-to-outlook", text: "Starface → Outlook" },
  ];

  const bookOptions: IDropdownOption[] = addressBooks.map((b, i) => ({
    key: i.toString(),
    text: b.name,
    data: b,
  }));

  const folderOptions: IDropdownOption[] = outlookFolders.map((f) => ({
    key: f.id,
    text: f.displayName,
  }));

  return (
    <div className="profile-editor">
      <Stack tokens={{ childrenGap: 16 }}>
        <Stack horizontal horizontalAlign="space-between" verticalAlign="center">
          <Text variant="xLarge">
            {isNew ? "Neues Profil" : "Profil bearbeiten"}
          </Text>
          <DefaultButton text="Zurück" onClick={onCancel} />
        </Stack>

        {error && (
          <MessageBar
            messageBarType={MessageBarType.error}
            onDismiss={() => setError("")}
          >
            {error}
          </MessageBar>
        )}

        <TextField
          label="Profilname"
          value={name}
          onChange={(_, v) => setName(v || "")}
          placeholder="z.B. Firmenkontakte Hauptanlage"
          required
        />

        <Text variant="large" className="section-title">
          Starface-Verbindung
        </Text>

        <Stack horizontal tokens={{ childrenGap: 8 }}>
          <Stack.Item grow>
            <TextField
              label="Host / IP-Adresse"
              value={connection.host}
              onChange={(_, v) =>
                setConnection({ ...connection, host: v || "" })
              }
              placeholder="z.B. pbx.firma.de oder 192.168.1.100"
              required
            />
          </Stack.Item>
          <TextField
            label="Port"
            value={connection.port.toString()}
            onChange={(_, v) =>
              setConnection({ ...connection, port: parseInt(v || "443") || 443 })
            }
            styles={{ root: { width: 80 } }}
          />
        </Stack>

        <Toggle
          label="HTTPS verwenden"
          checked={connection.useSsl}
          onChange={(_, checked) =>
            setConnection({
              ...connection,
              useSsl: checked ?? true,
              port: checked ? 443 : 80,
            })
          }
        />

        <TextField
          label="Login-ID"
          value={connection.loginId}
          onChange={(_, v) =>
            setConnection({ ...connection, loginId: v || "" })
          }
          required
        />

        <TextField
          label="Kennwort"
          type="password"
          value={connection.password}
          onChange={(_, v) =>
            setConnection({ ...connection, password: v || "" })
          }
          canRevealPassword
          required
        />

        <Stack horizontal tokens={{ childrenGap: 8 }}>
          <DefaultButton
            text="Verbindung testen"
            onClick={handleTestConnection}
            disabled={loading || !connection.host || !connection.loginId}
          />
          <PrimaryButton
            text="Adressbücher laden"
            onClick={handleLoadAddressBooks}
            disabled={loading || !connection.host || !connection.loginId}
          />
          {loading && <Spinner size={SpinnerSize.small} />}
        </Stack>

        {testResult && (
          <MessageBar
            messageBarType={
              testResult.success
                ? MessageBarType.success
                : MessageBarType.error
            }
          >
            {testResult.message.split("\n").map((line, i) => (
              <span key={i}>
                {i > 0 && <br />}
                {line}
              </span>
            ))}
          </MessageBar>
        )}

        {addressBooks.length > 0 && (
          <Dropdown
            label="Starface-Adressbuch"
            options={bookOptions}
            selectedKey={
              selectedBook
                ? addressBooks.indexOf(selectedBook).toString()
                : undefined
            }
            onChange={(_, option) => {
              if (option?.data) setSelectedBook(option.data);
            }}
            required
          />
        )}

        <Text variant="large" className="section-title">
          Outlook-Einstellungen
        </Text>

        <Dropdown
          label="Outlook Kontakte-Ordner"
          options={folderOptions}
          selectedKey={selectedFolderId}
          onChange={(_, option) => {
            if (option) setSelectedFolderId(option.key as string);
          }}
          required
        />

        <Dropdown
          label="Synchronisationsrichtung"
          options={directionOptions}
          selectedKey={syncDirection}
          onChange={(_, option) => {
            if (option) setSyncDirection(option.key as SyncProfile["syncDirection"]);
          }}
        />

        <Toggle
          label="Profil aktiviert"
          checked={enabled}
          onChange={(_, checked) => setEnabled(checked ?? true)}
        />

        <Stack horizontal tokens={{ childrenGap: 8 }}>
          <PrimaryButton text="Speichern" onClick={handleSave} />
          <DefaultButton text="Abbrechen" onClick={onCancel} />
        </Stack>
      </Stack>
    </div>
  );
};