import React, { useState } from "react";
import {
  View,
  ScrollView,
  Pressable,
  Image,
  Switch,
  InteractionManager,
} from "react-native";
import { useSirouRouter } from "@sirou/react-native";
import { AppRoutes } from "@/lib/routes";
import { Text } from "@/components/ui/text";
import {
  ArrowLeft,
  Settings,
  ChevronRight,
  CreditCard,
  ShieldCheck,
  FileText,
  HelpCircle,
  History,
  Bell,
  LogOut,
  User,
  Lock,
  Globe,
} from "@/lib/icons";
import { ScreenWrapper } from "@/components/ScreenWrapper";
import { ShadowWrapper } from "@/components/ShadowWrapper";
import { useColorScheme } from "nativewind";
import { saveTheme, AppTheme } from "@/lib/theme";
import { useAuthStore } from "@/lib/auth-store";
import { useLanguageStore, AppLanguage } from "@/lib/language-store";
import { LanguageModal } from "@/components/LanguageModal";
import { ThemeModal } from "@/components/ThemeModal";

// ── Constants ─────────────────────────────────────────────────────
const AVATAR_FALLBACK_BASE =
  "https://ui-avatars.com/api/?background=ea580c&color=fff&name=";

// ── Theme bottom sheet ────────────────────────────────────────────
const THEME_OPTIONS = [
  { value: "light", label: "Light" },
  { value: "dark", label: "Dark" },
  { value: "system", label: "System Default" },
] as const;

type ThemeOption = (typeof THEME_OPTIONS)[number]["value"];

const LANGUAGE_OPTIONS = [
  { value: "en", label: "English" },
  { value: "am", label: "Amharic" },
] as const;

type LanguageOption = (typeof LANGUAGE_OPTIONS)[number]["value"];

// ── Shared menu components ────────────────────────────────────────
function MenuGroup({
  label,
  children,
}: {
  label: string;
  children: React.ReactNode;
}) {
  return (
    <View className="mb-5">
      <Text variant="muted" className="text-xs font-semibold mb-2 px-1">
        {label}
      </Text>
      <ShadowWrapper>
        <View className="bg-card rounded-[10px] overflow-hidden">
          {children}
        </View>
      </ShadowWrapper>
    </View>
  );
}

function MenuItem({
  icon,
  label,
  sublabel,
  onPress,
  right,
  destructive = false,
  isLast = false,
}: {
  icon: React.ReactNode;
  label: string;
  sublabel?: string;
  onPress?: () => void;
  right?: React.ReactNode;
  destructive?: boolean;
  isLast?: boolean;
}) {
  return (
    <Pressable
      onPress={onPress}
      className={`flex-row items-center px-4 py-3 ${
        !isLast ? "border-b border-border/40" : ""
      }`}
    >
      <View className="h-9 w-9 rounded-[8px] items-center justify-center mr-3">
        {icon}
      </View>
      <View className="flex-1 mt-[-10px]">
        <Text
          variant="p"
          className={`font-medium ${destructive ? "text-red-500" : "text-foreground"}`}
        >
          {label}
        </Text>
        {sublabel ? (
          <Text variant="muted" className="text-xs mt-0.5">
            {sublabel}
          </Text>
        ) : null}
      </View>
      {right !== undefined ? (
        right
      ) : (
        <ChevronRight color={destructive ? "#ef4444" : "#94a3b8"} size={18} />
      )}
    </Pressable>
  );
}

// ── Screen ────────────────────────────────────────────────────────
export default function ProfileScreen() {
  const nav = useSirouRouter<AppRoutes>();
  const { user, logout } = useAuthStore();
  const { setColorScheme, colorScheme } = useColorScheme();
  const { language, setLanguage } = useLanguageStore();
  const [notifications, setNotifications] = useState(true);
  const [themeSheetVisible, setThemeSheetVisible] = useState(false);
  const [languageSheetVisible, setLanguageSheetVisible] = useState(false);

  const currentTheme: ThemeOption = (colorScheme as ThemeOption) ?? "system";
  const currentLanguage: LanguageOption = (language as LanguageOption) ?? "en";

  const handleThemeSelect = (val: AppTheme) => {
    // NativeWind 4 handles system/light/dark
    setColorScheme(val);
    saveTheme(val); // persist across restarts
  };

  return (
    <ScreenWrapper className="bg-background">
      {/* Header */}
      <View className="px-6 pt-4 flex-row justify-between items-center">
        <Pressable
          onPress={() => nav.back()}
          className="h-10 w-10 rounded-[10px] bg-card items-center justify-center border border-border"
        >
          <ArrowLeft
            color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
            size={20}
          />
        </Pressable>
        <Text variant="h4" className="text-foreground font-semibold">
          Profile
        </Text>
        {/* Edit Profile shortcut */}
        <Pressable
          onPress={() => nav.go("edit-profile")}
          className="h-10 w-10 rounded-[10px] bg-card items-center justify-center border border-border"
        >
          <User
            color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
            size={18}
          />
        </Pressable>
      </View>

      <ScrollView
        showsVerticalScrollIndicator={false}
        contentContainerStyle={{
          paddingHorizontal: 16,
          paddingTop: 24,
          paddingBottom: 80,
        }}
      >
        {/* Avatar */}
        <View className="items-center mb-8">
          <View className="h-20 w-20 rounded-full overflow-hidden bg-muted mb-3">
            <Image
              source={{
                uri:
                  user?.avatar ||
                  `${AVATAR_FALLBACK_BASE}${encodeURIComponent(`${user?.firstName} ${user?.lastName}`)}`,
              }}
              className="h-full w-full"
            />
          </View>
          <Text variant="h4" className="text-foreground">
            {user?.firstName} {user?.lastName}
          </Text>
          <Text variant="muted" className="text-sm mt-0.5">
            {user?.email}
          </Text>
        </View>

        <MenuGroup label="Account">
          {/* <MenuItem
            icon={
              <CreditCard
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Subscription"
            sublabel="Pro Plan — active"
            onPress={() => {}}
          /> */}
          <MenuItem
            icon={
              <History
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Transaction History"
            onPress={() => nav.go("history")}
            isLast
          />
        </MenuGroup>

        {/* Preferences */}
        <MenuGroup label="Preferences">
          {/* <MenuItem
            icon={
              <Bell
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Push Notifications"
            right={
              <Switch
                value={notifications}
                onValueChange={setNotifications}
                trackColor={{ true: "#ea580c" }}
              />
            }
          /> */}
          <MenuItem
            icon={
              <Settings
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Appearance"
            sublabel={
              THEME_OPTIONS.find((o) => o.value === currentTheme)?.label ??
              "System Default"
            }
            onPress={() => setThemeSheetVisible(true)}
          />
          <MenuItem
            icon={
              <Globe
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Language"
            sublabel={
              LANGUAGE_OPTIONS.find((o) => o.value === currentLanguage)?.label ??
              "English"
            }
            onPress={() => setLanguageSheetVisible(true)}
          />
          <MenuItem
            icon={
              <Lock
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Security"
            sublabel="PIN & Biometrics"
            onPress={() => {}}
            isLast
          />
        </MenuGroup>

        {/* Support & Legal */}
        <MenuGroup label="Support & Legal">
          <MenuItem
            icon={
              <HelpCircle
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Help & Support"
            onPress={() => nav.go("help")}
          />
          <MenuItem
            icon={
              <ShieldCheck
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Privacy Policy"
            onPress={() => nav.go("privacy")}
          />
          <MenuItem
            icon={
              <FileText
                color={colorScheme === "dark" ? "#f8fafc" : "#0f172a"}
                size={17}
              />
            }
            label="Terms of Use"
            onPress={() => nav.go("terms")}
            isLast
          />
        </MenuGroup>

        {/* Logout */}
        <ShadowWrapper>
          <View className="bg-card rounded-[10px] overflow-hidden">
            <MenuItem
              icon={
                <LogOut
                  color="#ef4444"
                  size={17}
                />
              }
              label="Log Out"
              destructive
              onPress={async () => {
                await logout();
                nav.go("login");
              }}
              right={null}
              isLast
            />
          </View>
        </ShadowWrapper>
      </ScrollView>

      {/* Theme sheet */}
      <ThemeModal
        visible={themeSheetVisible}
        current={currentTheme}
        onSelect={(theme) => handleThemeSelect(theme)}
        onClose={() => setThemeSheetVisible(false)}
      />

      <LanguageModal
        visible={languageSheetVisible}
        current={currentLanguage}
        onSelect={(lang) => setLanguage(lang)}
        onClose={() => setLanguageSheetVisible(false)}
      />
    </ScreenWrapper>
  );
}