import "dart:convert";
import "dart:typed_data";

import "package:flutter/foundation.dart";
import "package:quotegen_client/services/quote_api_v2.dart";
import "package:shadcn_flutter/shadcn_flutter.dart";
import "package:shared_preferences/shared_preferences.dart";


class FormProvider extends ChangeNotifier {

  String displayName = "";
  String handle = "";
  String content = "";
  bool verified = false;
  DateTime date = DateTime.now();
  TimeOfDay time = TimeOfDay.now();
  Uint8List? avatarImage;
  Uint8List? postImage;
  String replies = "";
  String retweets = "";
  String likes = "";
  String views = "";

  int? savedTimestamp;


  void setDisplayName(String v) {
    displayName = v;
    notifyListeners();
  }

  void setHandle(String v) {
    handle = v;
    notifyListeners();
  }

  void setContent(String v) {
    content = v;
    notifyListeners();
  }

  void setVerified(bool v) {
    verified = v;
    notifyListeners();
  }

  void setDate(DateTime v) {
    date = v;
    notifyListeners();
  }

  void setTime(TimeOfDay v) {
    time = v;
    notifyListeners();
  }

  void setAvatarImage(Uint8List? v) {
    avatarImage = v;
    notifyListeners();
  }

  void setPostImage(Uint8List? v) {
    postImage = v;
    notifyListeners();
  }

  void setReplies(String v) {
    replies = v;
    notifyListeners();
  }

  void setRetweets(String v) {
    retweets = v;
    notifyListeners();
  }

  void setLikes(String v) {
    likes = v;
    notifyListeners();
  }

  void setViews(String v) {
    views = v;
    notifyListeners();
  }

  void setSavedTimestamp(int? v) {
    savedTimestamp = v;
    notifyListeners();
  }

  // auto-fill empty engagement fields with "1" if any have a value
  // returns true if anything was filled
  bool fillEmptyEngagement() {
    bool hasValue = replies != "" || retweets != "" || likes != "" || views != "";
    bool didFill = false;

    if (hasValue) {
      if (replies == "") { replies = "1"; didFill = true; }
      if (retweets == "") { retweets = "1"; didFill = true; }
      if (likes == "") { likes = "1"; didFill = true; }
      if (views == "") { views = "1"; didFill = true; }
    }

    if (didFill) notifyListeners();
    return didFill;
  }

  int combineDateTime() {
    DateTime combined = DateTime(
      date.year,
      date.month,
      date.day,
      time.hour,
      time.minute,
    );
    return combined.millisecondsSinceEpoch ~/ 1000;
  }

  int? _parseNum(String val) {
    if (val.isEmpty) return null;
    return int.tryParse(val.replaceAll(",", ""));
  }

  QuoteEngagement? buildEngagement(String field) {
    if (field == "engagement") {
      if (likes == "" && retweets == "" && replies == "" && views == "") {
        return null;
      }
      return QuoteEngagement(
        likes: _parseNum(likes),
        retweets: _parseNum(retweets),
        replies: _parseNum(replies),
        views: _parseNum(views),
      );
    }

    return QuoteEngagement(
      likes: field == "engagement_likes" ? _parseNum(likes) : null,
      retweets: field == "engagement_retweets" ? _parseNum(retweets) : null,
      replies: field == "engagement_replies" ? _parseNum(replies) : null,
      views: field == "engagement_views" ? _parseNum(views) : null,
    );
  }

  QuoteSessionRequest buildFullRequest() {
    QuoteEngagement? engagement;
    if (likes != "" || retweets != "" || replies != "" || views != "") {
      engagement = QuoteEngagement(
        likes: _parseNum(likes),
        retweets: _parseNum(retweets),
        replies: _parseNum(replies),
        views: _parseNum(views),
      );
    }

    return QuoteSessionRequest(
      displayName: displayName,
      username: handle.toLowerCase(),
      text: content,
      timestamp: combineDateTime(),
      verified: verified,
      avatarUrl: avatarImage,
      imageUrl: postImage,
      engagement: engagement,
    );
  }

  // load form data from shared prefs
  Future<void> loadFormData() async {
    try {
      final prefs = await SharedPreferences.getInstance();

      final dn = prefs.getString("display_name") ?? "";
      final h = prefs.getString("handle") ?? "";
      final c = prefs.getString("content") ?? "";
      final ts = prefs.getInt("timestamp") ?? 0;
      final rep = prefs.getString("replies") ?? "";
      final ret = prefs.getString("retweets") ?? "";
      final lk = prefs.getString("likes") ?? "";
      final vw = prefs.getString("views") ?? "";
      final ver = prefs.getBool("verified") ?? false;

      if (ts > 0) savedTimestamp = ts;

      Uint8List? avatarImg;
      Uint8List? postImg;

      String? avatarBase64 = prefs.getString("avatar_image");
      if (avatarBase64 != null && avatarBase64.isNotEmpty) {
        avatarImg = base64Decode(avatarBase64);
      }

      String? postBase64 = prefs.getString("post_image");
      if (postBase64 != null && postBase64.isNotEmpty) {
        postImg = base64Decode(postBase64);
      }

      print("Loaded form data: name=$dn, handle=$h");

      displayName = dn;
      handle = h;
      content = c;
      verified = ver;
      replies = rep;
      retweets = ret;
      likes = lk;
      views = vw;
      avatarImage = avatarImg;
      postImage = postImg;

      notifyListeners();
    } catch (e) {
      print("Error loading form data: $e");
    }
  }

  Future<void> saveFormData() async {
    try {
      final prefs = await SharedPreferences.getInstance();

      print("Saving form data: name=$displayName, handle=$handle");

      int tsMillis = combineDateTime() * 1000;

      await prefs.setString("display_name", displayName);
      await prefs.setString("handle", handle);
      await prefs.setString("content", content);
      await prefs.setInt("timestamp", tsMillis);
      await prefs.setString("replies", replies);
      await prefs.setString("retweets", retweets);
      await prefs.setString("likes", likes);
      await prefs.setString("views", views);
      await prefs.setBool("verified", verified);

      if (avatarImage != null) {
        await prefs.setString("avatar_image", base64Encode(avatarImage!));
      } else {
        await prefs.remove("avatar_image");
      }

      if (postImage != null) {
        await prefs.setString("post_image", base64Encode(postImage!));
      } else {
        await prefs.remove("post_image");
      }

      print("Form data saved");
    } catch (e) {
      print("Error savin form data: $e");
    }
  }
}