"use client";

import { useEffect, useState } from "react";

import { LogoutButton } from "@/components/logout-button";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Checkbox } from "@/components/ui/checkbox";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  clearDailyReminderSentToday,
  getNotificationPermissionLabel,
  getNotificationPermissionState,
  isNotificationSupported,
  requestNotificationPermission,
  showTestDailyReminderNotification,
} from "@/lib/daily-reminders";
import { getDailyReminderStatus } from "@/lib/daily-reminder-status";
import { getTodayDateKey } from "@/lib/habits-storage";
import {
  avatarVibeOptions,
  defaultProfilePreferences,
  focusTopicOptions,
  getProfilePreferences,
  saveProfilePreferences,
  type ProfilePreferences,
} from "@/lib/profile-preferences-storage";

type ProfilePreferencesFormProps = {
  email?: string | null;
};

export function ProfilePreferencesForm({ email }: ProfilePreferencesFormProps) {
  const [preferences, setPreferences] = useState<ProfilePreferences>(
    defaultProfilePreferences,
  );
  const [isReady, setIsReady] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [isSaving, setIsSaving] = useState(false);
  const [notificationPermission, setNotificationPermission] = useState(
    getNotificationPermissionState(),
  );
  const [notificationMessage, setNotificationMessage] = useState<string | null>(
    null,
  );

  useEffect(() => {
    setNotificationPermission(getNotificationPermissionState());
  }, []);

  useEffect(() => {
    async function loadPreferences() {
      try {
        setPreferences(await getProfilePreferences());
      } catch (loadError) {
        setError(
          loadError instanceof Error
            ? loadError.message
            : "Could not load profile preferences.",
        );
      } finally {
        setIsReady(true);
      }
    }

    void loadPreferences();
  }, []);

  const updatePreferences = async (updates: Partial<ProfilePreferences>) => {
    const nextPreferences = { ...preferences, ...updates };
    setPreferences(nextPreferences);
    setIsSaving(true);
    setError(null);

    try {
      const savedPreferences = await saveProfilePreferences(nextPreferences);
      setPreferences(savedPreferences);

      if (
        "dailyReminderEnabled" in updates ||
        "dailyReminderTime" in updates
      ) {
        clearDailyReminderSentToday(getTodayDateKey());
      }
    } catch (saveError) {
      setPreferences(preferences);
      setError(
        saveError instanceof Error
          ? saveError.message
          : "Could not save profile preferences.",
      );
    } finally {
      setIsSaving(false);
    }
  };

  const handleDailyReminderToggle = async (checked: boolean) => {
    if (checked) {
      if (!isNotificationSupported()) {
        setError("This browser does not support notifications.");
        return;
      }

      const permission = await requestNotificationPermission();
      setNotificationPermission(permission);

      if (permission !== "granted") {
        setError(
          permission === "denied"
            ? "Notifications are blocked. Enable them in your browser settings to use daily reminders."
            : "Notification permission was not granted.",
        );
        return;
      }
    }

    setError(null);
    await updatePreferences({ dailyReminderEnabled: checked });
  };

  const handleTestNotification = async () => {
    setNotificationMessage(null);
    setError(null);

    if (!isNotificationSupported()) {
      setError("This browser does not support notifications.");
      return;
    }

    const permission = await requestNotificationPermission();
    setNotificationPermission(permission);

    if (permission !== "granted") {
      setError(
        permission === "denied"
          ? "Notifications are blocked. Enable them in your browser settings."
          : "Notification permission was not granted.",
      );
      return;
    }

    const status = await getDailyReminderStatus();
    const shown = showTestDailyReminderNotification(status);

    if (!shown) {
      setError("Could not show a test notification.");
      return;
    }

    setNotificationMessage(
      "Test notification sent. Check the corner of your screen or Windows notification center.",
    );
  };

  if (!isReady) {
    return (
      <p className="text-sm text-muted-foreground">Loading profile...</p>
    );
  }

  return (
    <div className="flex flex-col gap-6">
      {error ? <p className="text-sm text-red-500">{error}</p> : null}

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Profile information</CardTitle>
          <CardDescription>Your account details.</CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="email">Email</Label>
            <Input id="email" value={email ?? "Guest user"} readOnly />
          </div>
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Focus topic preference</CardTitle>
          <CardDescription>
            Choose the one area you want your pet and daily tasks to focus on.
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-2">
          {focusTopicOptions.map((topic) => (
            <Button
              key={topic}
              type="button"
              variant={preferences.focusTopic === topic ? "default" : "outline"}
              className="w-full justify-start"
              disabled={isSaving}
              onClick={() => void updatePreferences({ focusTopic: topic })}
            >
              {topic}
            </Button>
          ))}
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Avatar preferences</CardTitle>
          <CardDescription>Personalize your pet&apos;s vibe.</CardDescription>
        </CardHeader>
        <CardContent className="flex flex-wrap gap-2">
          {avatarVibeOptions.map((vibe) => (
            <Button
              key={vibe}
              type="button"
              size="sm"
              disabled={isSaving}
              variant={preferences.avatarVibe === vibe ? "default" : "outline"}
              onClick={() => void updatePreferences({ avatarVibe: vibe })}
            >
              {vibe}
            </Button>
          ))}
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Notification preferences</CardTitle>
          <CardDescription>
            Control reminders for your daily quiz and habits.
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="flex items-center justify-between rounded-lg border px-3 py-2">
            <Label htmlFor="daily-reminder">Daily reminder</Label>
            <Checkbox
              id="daily-reminder"
              disabled={isSaving || !isNotificationSupported()}
              checked={preferences.dailyReminderEnabled}
              onCheckedChange={(checked) =>
                void handleDailyReminderToggle(checked === true)
              }
            />
          </div>
          <div className="flex items-center justify-between rounded-lg border px-3 py-2">
            <span className="text-sm">Browser permission</span>
            <Badge variant="secondary">
              {getNotificationPermissionLabel(notificationPermission)}
            </Badge>
          </div>
          <div className="space-y-2">
            <Label htmlFor="reminder-time">Daily reminder time</Label>
            <Input
              id="reminder-time"
              type="time"
              disabled={isSaving || !preferences.dailyReminderEnabled}
              value={preferences.dailyReminderTime}
              onChange={(event) =>
                void updatePreferences({ dailyReminderTime: event.target.value })
              }
            />
          </div>
          <p className="text-xs text-muted-foreground">
            Reminders use your browser&apos;s local time and notify you once
            per day when the quiz or habits are still incomplete. Keep this app
            open in a tab for reminders to fire. On Windows, check Focus Assist
            if notifications are hidden.
          </p>
          <Button
            type="button"
            variant="outline"
            className="w-full"
            disabled={
              isSaving || notificationPermission !== "granted"
            }
            onClick={() => void handleTestNotification()}
          >
            Send test notification
          </Button>
          {notificationMessage ? (
            <p className="text-xs text-emerald-600">{notificationMessage}</p>
          ) : null}
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Account settings</CardTitle>
          <CardDescription>Session and onboarding status.</CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="flex items-center justify-between rounded-lg border px-3 py-2">
            <span className="text-sm">Onboarding</span>
            <Badge variant="secondary">Complete</Badge>
          </div>
          <LogoutButton />
        </CardContent>
      </Card>
    </div>
  );
}