import React, {
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from "react";
import { Image as ExpoImage } from "expo-image";
import { Pressable, ScrollView, StyleSheet, Text, View } from "react-native";
import useMinuit from "react-native-minuit/src/hooks/useMinuit.js";
import { background, cardsImg, icons } from "../../assets";
import Alert from "../../components/Alert";
import BorderGradient from "../../components/BorderGradient/BorderGradient";
import { LinearGradient } from "../../components/LinearGradient/LinearGradient";
import FullscreenIntroVideo from "../../components/FullscreenIntroVideo";
import GradientButton from "../../components/GradientButton";
import MoreMenu from "../../components/MoreMenu";
import ProjectDropDown from "../../components/ProjectDropDown/ProjectDropDown";
import CoinPackModal from "../../components/modal/CoinPackModal";
import { projectsRef, usersRef } from "../../config/firebase";
import { isWeb } from "../../hooks/useLayoutType.js";
import Page from "../../layouts/Page";
import LandingPage from "../LandingPage";
import { navigate } from "../../navigation/NavigationService";
import { Routes } from "../../navigation/Routes";
import { useUser } from "../../providers/UserDataProvider";
import CreditAmount from "../../components/CreditAmount";
import ShareBtn from "../../components/ShareBtn/ShareBtn";
import { Palette, gutters } from "../../styles";
import { FONT_FAMILY } from "../../styles/Fonts";
import {
  getCreationStageStates,
  getStageAction,
} from "../../utils/projectStages";
import { openCoinPackModal } from "../../utils/coinPackModal";
import useNavigateToMusicDetails from "../../hooks/useNavigateToMusicDetails";
import StageCard from "./components/StageCard";
import ClubCard from "./components/ClubCard";

const isProjectEmpty = (project) => {
  if (!project) {
    return false;
  }

  return !(
    typeof project?.title === "string" && project.title.trim().length > 0
  );
};

const HOME_BACKGROUND_WIDTH = isWeb ? 1280 : 520;
const HOME_BACKGROUND_HEIGHT = isWeb ? 760 : 360;
const HOME_BACKGROUND_STYLE_WIDTH = HOME_BACKGROUND_WIDTH + 120;
const HOME_BACKGROUND_STYLE_HEIGHT = HOME_BACKGROUND_HEIGHT + 80;

const STAGE_CARD_CONTENT = [
  {
    key: "songwriter",
    step: "ÉTAPE 1",
    description:
      "Ensemble, nous allons écrire ta chanson.\nMéthodiquement je vais te guider pour construire une oeuvre unique et authentique.",
    image: cardsImg.writing,
    imagePosition: "left",
    textAlign: "left",
    lockSide: "right",
  },
  {
    key: "beatmaker",
    step: "ÉTAPE 2",
    description:
      "Je suis Malik, responsable du studio de MusicLand.\nJe vais mettre en musique tes paroles en fonction de tes goûts musicaux, ça va être top !",
    image: cardsImg.studio,
    imagePosition: "right",
    textAlign: "right",
    lockSide: "left",
  },
  {
    key: "director",
    step: "ÉTAPE 3",
    description:
      "Tu vas faire une expérience extraordinaire, tu vas te filmer en train d’interpreter ta chanson en Play Back et je vais te guider pour te faciliter la tâche!",
    image: cardsImg.video,
    imagePosition: "left",
    textAlign: "left",
    lockSide: "right",
  },
  {
    key: "publisher",
    step: "ÉTAPE 4",
    description:
      "Je suis Mr Benhaï, Producteur de MusicLand, et je vais te faire une proposition qui pourrait t’intéresser. On se retrouve à la sortie du studio !",
    image: cardsImg.production,
    imagePosition: "right",
    textAlign: "right",
    lockSide: "left",
  },
];

const ACTIVE_SUBSCRIPTION_STATUSES = new Set([
  "trialing",
  "active",
  "past_due",
  "unpaid",
]);

const Home = ({ navigation, route }) => {
  const {
    userProjects = [],
    selectProject,
    selectedProject,
    selectedProjectId,
    currentUserData,
    currentUID,
    createNewProject,
    videos,
    hasActiveSubscription,
  } = useUser();
  const { setTooltip } = useMinuit();
  const [videoUrl, setVideoUrl] = useState(null);
  const navigateToMusicDetails = useNavigateToMusicDetails();

  if (!currentUID) {
    return <LandingPage />;
  }

  const projects = useMemo(
    () => (Array.isArray(userProjects) ? userProjects : []),
    [userProjects],
  );

  const currentProject = useMemo(() => {
    if (!projects.length) return null;
    if (selectedProjectId === null) {
      return null;
    }
    const activeId = selectedProject?.id || selectedProjectId;
    if (!activeId) {
      return projects[0];
    }
    return projects.find((project) => project?.id === activeId) || projects[0];
  }, [projects, selectedProject?.id, selectedProjectId]);

  const formatDate = useCallback((timestamp) => {
    try {
      const value = timestamp?.toDate ? timestamp.toDate() : timestamp;
      const date = value ? new Date(value) : null;
      if (!date || Number.isNaN(date.getTime())) {
        return "";
      }
      const day = date.getDate().toString().padStart(2, "0");
      const month = (date.getMonth() + 1).toString().padStart(2, "0");
      return `${day}/${month}`;
    } catch (error) {
      console.warn("Home.web: formatDate error", error);
      return "";
    }
  }, []);

  const stageStates = useMemo(
    () => getCreationStageStates(currentProject),
    [currentProject],
  );

  const stageStatesByKey = useMemo(() => {
    if (!Array.isArray(stageStates)) {
      return {};
    }
    return stageStates.reduce((acc, stage) => {
      if (stage?.key) {
        acc[stage.key] = stage;
      }
      return acc;
    }, {});
  }, [stageStates]);

  const [menuVisible, setMenuVisible] = useState(false);
  const [menuAnchor, setMenuAnchor] = useState(null);
  const [menuProject, setMenuProject] = useState(null);
  const menuAnchorRef = useRef(null);
  const projectDropdownRef = useRef(null);
  const [hasLocalAdventureFlag, setHasLocalAdventureFlag] = useState(false);

  const handleSelectProject = useCallback(
    (project) => {
      if (!project?.id) return;
      selectProject(project.id);
    },
    [selectProject],
  );

  const handleCloseMenu = useCallback(() => {
    setMenuVisible(false);
    setMenuAnchor(null);
    setMenuProject(null);
    menuAnchorRef.current = null;
  }, []);

  const handleDeleteProject = useCallback(async () => {
    if (!menuProject?.id) return;
    try {
      await projectsRef.doc(menuProject.id).delete();
      setTooltip?.({ type: "success", text: "Projet supprimé" });
    } catch (error) {
      setTooltip?.({
        type: "error",
        text: error?.message || "Suppression impossible",
      });
    } finally {
      handleCloseMenu();
    }
  }, [handleCloseMenu, menuProject?.id, setTooltip]);

  const handleModifyProject = useCallback((project, anchor) => {
    if (!project?.id) return;

    const prevAnchor = menuAnchorRef.current;
    const normalizedAnchor =
      typeof anchor === "number"
        ? { top: anchor }
        : anchor && typeof anchor === "object"
          ? anchor
          : {};

    setMenuProject(project);
    setMenuAnchor(normalizedAnchor);
    setMenuVisible((prev) => {
      if (!prev) return true;
      const prevTop =
        typeof prevAnchor?.top === "number" ? prevAnchor.top : null;
      const nextTop =
        typeof normalizedAnchor?.top === "number" ? normalizedAnchor.top : null;
      return prevTop !== nextTop;
    });
    menuAnchorRef.current = normalizedAnchor;
  }, []);

  const moreMenuItems = useMemo(() => {
    if (!menuProject?.id) return [];

    const items = [];
    const hasSongUrl =
      typeof menuProject?.songUrl === "string" &&
      menuProject.songUrl.length > 0;

    if (hasSongUrl) {
      items.push({
        label: "Jouer la musique",
        onPress: () => {
          projectDropdownRef.current?.close?.();
          navigateToMusicDetails({
            projectId: menuProject.id,
            songUrl: menuProject.songUrl,
            project: menuProject,
          });
        },
      });
    }

    items.push({
      label: "Supprimer",
      onPress: () =>
        Alert(
          "Confirmer la suppression",
          "Cette action supprimera définitivement ce projet.",
          [
            { text: "Annuler", style: "cancel" },
            {
              text: "Supprimer",
              style: "destructive",
              onPress: () => {
                handleDeleteProject();
              },
            },
          ],
          { cancelable: true },
        ),
    });

    return items;
  }, [handleDeleteProject, menuProject, navigateToMusicDetails]);

  useEffect(() => {
    if (!route?.params?.showLyricsCongrats) {
      return;
    }
    const beatmakerStage = currentProject
      ? getStageAction("beatmaker", currentProject)
      : null;
    Alert(
      "Céline",
      "Bravo ! Vous venez de terminer de créer les paroles de votre musique ! Maintenant vous pouvez passer à la prochaine étape : le Studio pour donner vie à votre chanson !",
      [
        {
          text: "Retour à l'accueil",
          style: "cancel",
        },
        {
          text: "Continuer vers le Studio",
          onPress: () => {
            if (!currentProject?.id) {
              return;
            }
            if (selectedProject?.id !== currentProject.id) {
              selectProject(currentProject.id);
            }
            const targetRoute = beatmakerStage?.route || Routes.Compose;
            navigate(targetRoute, beatmakerStage?.params);
          },
        },
      ],
    );
    navigation?.setParams?.({ showLyricsCongrats: false });
  }, [
    currentProject,
    navigation,
    selectProject,
    selectedProject?.id,
    route?.params?.showLyricsCongrats,
  ]);

  const hasActiveProject = !!currentProject;

  const ensureProjectSelected = useCallback(() => {
    if (!currentProject?.id) {
      return;
    }
    if (selectedProject?.id !== currentProject.id) {
      selectProject(currentProject.id);
    }
  }, [currentProject?.id, selectProject, selectedProject?.id]);

  const songwriterAction = useMemo(
    () => getStageAction("songwriter", null),
    [],
  );

  const handleStartNew = useCallback(async () => {
    const targetRoute = songwriterAction?.route || Routes.WritingLyrics;
    const targetParams = songwriterAction?.params;

    try {
      const emptyProject =
        projects.find((project) => isProjectEmpty(project)) || null;

      if (emptyProject?.id) {
        selectProject(emptyProject.id);
        navigate(targetRoute, targetParams);
        return;
      }

      const newProjectId = await createNewProject({ hasLyrics: false });
      if (!newProjectId) {
        return;
      }
      navigate(targetRoute, targetParams);
    } catch (error) {
      console.warn("Home: unable to start new project", error);
      setTooltip?.({
        type: "error",
        text: "Impossible de démarrer un nouveau projet",
      });
    }
  }, [createNewProject, projects, selectProject, setTooltip, songwriterAction]);

  useEffect(() => {
    if (currentUserData?.adventureStarted) {
      setHasLocalAdventureFlag(true);
    }
  }, [currentUserData?.adventureStarted]);

  const persistAdventureStarted = useCallback(async () => {
    if (!currentUID) {
      return;
    }
    await usersRef
      .doc(currentUID)
      .set({ adventureStarted: true }, { merge: true });
  }, [currentUID]);

  const markAdventureStarted = useCallback(() => {
    if (hasLocalAdventureFlag) {
      return;
    }
    setHasLocalAdventureFlag(true);
    persistAdventureStarted().catch((error) => {
      console.warn("Home: adventureStarted update failed", error);
      setHasLocalAdventureFlag(false);
      setTooltip?.({
        type: "error",
        text: "Impossible de mettre à jour votre profil",
      });
    });
  }, [hasLocalAdventureFlag, persistAdventureStarted, setTooltip]);

  const handleStartVisit = useCallback(() => {
    setVideoUrl(isWeb ? videos?.landingWeb : videos?.landing);
  }, []);

  const handleIntroVideoClose = useCallback(() => {
    setVideoUrl(null);
    markAdventureStarted();
  }, [markAdventureStarted]);

  const adventureStarted =
    hasLocalAdventureFlag || !!currentUserData?.adventureStarted;

  const homeBackgroundImage = background.bgTrans;
  const landingBackgroundImage = homeBackgroundImage;

  const stageCards = useMemo(
    () =>
      STAGE_CARD_CONTENT.map((card) => ({
        ...card,
        isLocked: stageStatesByKey[card.key]?.isLocked ?? true,
      })),
    [stageStatesByKey],
  );

  const [isCoinModalVisible, setCoinModalVisible] = useState(false);

  const handleStagePress = useCallback(
    (stageKey, isLocked) => {
      if (isLocked) {
        return;
      }

      if (!hasActiveProject || !currentProject) {
        if (stageKey === "songwriter") {
          handleStartNew();
        }
        return;
      }

      ensureProjectSelected();
      const action = getStageAction(stageKey, currentProject);
      if (!action?.route) {
        return;
      }
      navigate(action.route, action.params);
    },
    [currentProject, ensureProjectSelected, hasActiveProject, handleStartNew],
  );

  const handleClubPress = useCallback(() => {
    navigate(Routes.Payments);
  }, []);

  const handleOpenCoinModal = useCallback(() => {
    if (isWeb) {
      openCoinPackModal();
      return;
    }
    setCoinModalVisible(true);
  }, []);

  const handleCloseCoinModal = useCallback(() => {
    setCoinModalVisible(false);
  }, []);

  const handleNavigateToLanding = useCallback(() => {
    navigate(Routes.LandingPage);
  }, []);

  const stageCardContainerStyle = isWeb ? styles.cardsGrid : styles.cardsStack;
  const stageCardItemStyle = isWeb
    ? styles.webStageCard
    : styles.mobileStageCard;

  const stageCardsList = (
    <View style={stageCardContainerStyle}>
      {stageCards.map((card) => (
        <StageCard
          key={card.key}
          step={card.step}
          description={card.description}
          image={card.image}
          imagePosition={card.imagePosition}
          textAlign={card.textAlign}
          isLocked={card.isLocked}
          lockSide={card.lockSide}
          onPress={() => handleStagePress(card.key, card.isLocked)}
          containerStyle={stageCardItemStyle}
          variant={isWeb ? "web" : "mobile"}
        />
      ))}
    </View>
  );

  const coinBalance = useMemo(() => {
    const value = currentUserData?.coins;
    if (typeof value === "number" && Number.isFinite(value)) {
      return value;
    }
    if (typeof value === "string") {
      const parsed = Number(value);
      if (Number.isFinite(parsed)) {
        return parsed;
      }
    }
    return 0;
  }, [currentUserData?.coins]);

  const mobileInfoRow = !isWeb ? (
    <View style={styles.mobileInfoRow}>
      <Pressable
        onPress={handleOpenCoinModal}
        accessibilityRole="button"
        style={styles.mobileCoinButton}
      >
        <CreditAmount
          value={coinBalance}
          style={styles.mobileCoinAmount}
          textStyle={styles.mobileCoinText}
          iconSize={20}
          iconPosition="left"
        />
      </Pressable>
      <ShareBtn style={styles.mobileShareButton} label="Partager" />
    </View>
  ) : null;

  const topBar = (
    <View style={styles.topBar}>
      <Pressable
        onPress={handleNavigateToLanding}
        accessibilityRole="button"
        style={[
          styles.returnLandingButton,
          isWeb ? styles.returnLandingButtonWeb : null,
        ]}
      >
        <Text style={styles.returnLandingButtonText}>
          Retour à l'accueil
        </Text>
      </Pressable>
      <View style={styles.topBarContent}>
        {mobileInfoRow}
        <ProjectDropDown
          ref={projectDropdownRef}
          style={styles.projectDropDown}
          projects={projects}
          selectedProject={currentProject}
          allowEmptySelection
          onSelectProject={handleSelectProject}
          onModifyProject={handleModifyProject}
          onCreateProject={handleStartNew}
          formatDate={formatDate}
        />
      </View>
    </View>
  );

  const journeyContent = (
    <>
      <MoreMenu
        visible={menuVisible}
        top={menuAnchor?.top ?? 0}
        position={menuAnchor}
        onClose={handleCloseMenu}
        inPlaylist={false}
        projectId={menuProject?.id || null}
        extraItems={moreMenuItems}
      />

      <View style={styles.subtitleWrapper}>
        {isWeb ? (
          <LinearGradient
            colors={["#F94697", "#7023F7"]}
            start={{ x: 0, y: 0.5 }}
            end={{ x: 1, y: 0.5 }}
            style={[styles.subtitleGradient, styles.subtitleGradientWeb]}
          >
            <View style={[styles.subtitleInner, styles.subtitleInnerWeb]}>
              <Text style={styles.subtitle}>5 espaces à découvrir</Text>
            </View>
          </LinearGradient>
        ) : (
          <BorderGradient
            style={[styles.subtitleGradient, styles.subtitleBorder]}
            gradientProps={{
              colors: ["#F94697", "#7023F7"],
              start: { x: 0, y: 0.5 },
              end: { x: 1, y: 0.5 },
              locations: [0, 1],
            }}
          >
            <View style={styles.subtitleInner}>
              <Text style={styles.subtitle}>5 espaces à découvrir</Text>
            </View>
          </BorderGradient>
        )}
      </View>

      {stageCardsList}

      <ClubCard
        onPress={handleClubPress}
      />
    </>
  );

  return (
    <>
      {adventureStarted ? (
        <View style={styles.root}>
          <Page
            shareBtn
            headerType="NONE"
            scrollEnabled={false}
            containerStyle={styles.page}
            contentContainerStyle={styles.pageContent}
            maxWidth={1600}
            width="100%"
            backgroundColor="#303438"
          >
            <View style={styles.inner}>
              <ExpoImage
                source={homeBackgroundImage}
                contentFit="cover"
                style={styles.centerImage}
              />
              {isWeb ? (
                <View style={styles.contentOverlay}>
                  {topBar}
                  {journeyContent}
                </View>
              ) : (
                <View style={[styles.contentOverlay, styles.mobileContent]}>
                  {topBar}
                  <ScrollView
                    style={styles.mobileScrollView}
                    contentContainerStyle={styles.mobileScrollContent}
                    showsVerticalScrollIndicator={false}
                  >
                    {journeyContent}
                  </ScrollView>
                </View>
              )}
            </View>
          </Page>
        </View>
      ) : (
        <>
          <Page
            shareBtn
            title="Landing Page"
            backgroundImg={landingBackgroundImage}
            contentContainerStyle={styles.pageContent}
            backgroundColor="#303438"
          >
            <View
              style={{
                flex: 1,
                justifyContent: "center",
                alignItems: "center",
              }}
            >
              <GradientButton
                title="Commencer l'aventure MusicLand"
                onPress={handleStartVisit}
              />
            </View>
          </Page>
          <FullscreenIntroVideo
            url={videoUrl}
            visible={!!videoUrl}
            onClose={handleIntroVideoClose}
          />
        </>
      )}
      {!isWeb ? (
        <CoinPackModal
          visible={isCoinModalVisible}
          onClose={handleCloseCoinModal}
        />
      ) : null}
    </>
  );
};

export default Home;

const styles = StyleSheet.create({
  root: {
    flex: 1,
    backgroundColor: "#303438",
  },
  page: {
    backgroundColor: "transparent",
    padding: 0,
    paddingTop: 0,
    paddingBottom: 0,
    width: "100%",
  },
  pageContent: {
    flexGrow: 1,
  },
  inner: {
    flex: 1,
    width: "100%",
    alignSelf: "stretch",
    alignItems: "stretch",
    justifyContent: "flex-start",
    position: "relative",
  },
  centerImage: {
    width: HOME_BACKGROUND_STYLE_WIDTH,
    height: HOME_BACKGROUND_STYLE_HEIGHT,
    borderRadius: 22,
    overflow: "hidden",
    position: "absolute",
    top: isWeb ? "45%" : "50%",
    left: "50%",
    transform: [
      { translateX: -HOME_BACKGROUND_STYLE_WIDTH / 2 },
      { translateY: -HOME_BACKGROUND_STYLE_HEIGHT / 2 },
    ],
    pointerEvents: "none",
    zIndex: 0,
  },
  contentOverlay: {
    position: "relative",
    width: "100%",
    flexGrow: 1,
  },
  topBar: {
    width: "100%",
    flexDirection: isWeb ? "row" : "column",
    flexWrap: isWeb ? "wrap" : "nowrap",
    alignItems: isWeb ? "center" : "stretch",
    justifyContent: isWeb ? "center" : "flex-start",
    gap: isWeb ? 0 : 12,
    marginTop: isWeb ? 12 : 0,
    marginBottom: isWeb ? 4 : 16,
    paddingHorizontal: isWeb ? 0 : gutters,
    zIndex: 10,
    position: "relative",
  },
  returnLandingButton: {
    paddingHorizontal: 14,
    paddingVertical: 10,
    borderRadius: 18,
    backgroundColor: "rgba(12, 14, 18, 0.72)",
    borderWidth: 1,
    borderColor: "rgba(255, 255, 255, 0.1)",
    alignSelf: "flex-start",
  },
  returnLandingButtonWeb: {
    position: "absolute",
    left: 0,
    top: 0,
    transform: [{ translateY: -2 }],
  },
  returnLandingButtonText: {
    fontSize: 14,
    color: Palette.white,
    fontFamily: FONT_FAMILY.InterSemiBold,
  },
  topBarContent: {
    flex: 1,
    width: "100%",
    flexDirection: isWeb ? "row" : "column",
    alignItems: isWeb ? "center" : "stretch",
    justifyContent: isWeb ? "center" : "flex-start",
    gap: 12,
  },
  projectDropDown: {
    width: isWeb ? 420 : "100%",
    maxWidth: 420,
    flexGrow: 1,
  },
  mobileInfoRow: {
    width: "100%",
    flexDirection: "row",
    alignItems: "center",
    justifyContent: "space-between",
    gap: 12,
  },
  mobileCoinButton: {
    flexDirection: "row",
    alignItems: "center",
    gap: 8,
    paddingHorizontal: 14,
    paddingVertical: 8,
    borderRadius: 20,
    backgroundColor: "rgba(12, 14, 18, 0.72)",
    borderWidth: 1,
    borderColor: "rgba(255, 255, 255, 0.1)",
    flexShrink: 1,
  },
  mobileCoinAmount: {
    flexDirection: "row",
    alignItems: "center",
    gap: 6,
  },
  mobileCoinText: {
    fontSize: 18,
    color: Palette.white,
    fontFamily: FONT_FAMILY.InterSemiBold,
  },
  mobileShareButton: {
    flexShrink: 0,
  },
  mobileContent: {
    flex: 1,
    width: "100%",
  },
  mobileScrollView: {
    flex: 1,
    width: "100%",
  },
  mobileScrollContent: {
    paddingHorizontal: gutters,
    paddingTop: 0,
    paddingBottom: gutters * 6,
  },
  subtitleWrapper: {
    width: "100%",
    marginBottom: isWeb ? 12 : 16,
    marginTop: isWeb ? 8 : 15,
    alignItems: "center",
  },
  subtitleGradient: {
    width: "100%",
    maxWidth: 420,
    borderRadius: 999,
    alignSelf: "center",
  },
  subtitleBorder: {
    borderWidth: 1,
  },
  subtitleGradientWeb: {
    padding: 2,
  },
  subtitleInner: {
    width: "100%",
    paddingHorizontal: 24,
    paddingVertical: 10,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: 999,
    backgroundColor: Palette.glass,
  },
  subtitleInnerWeb: {
    paddingVertical: 10,
    backgroundColor: Palette.lightPurple,
  },
  subtitle: {
    fontFamily: FONT_FAMILY.InterMedium,
    fontSize: 18,
    color: Palette.white,
    textAlign: "center",
    textTransform: "uppercase",
    letterSpacing: 1,
  },
  cardsGrid: {
    width: "100%",
    flexDirection: "row",
    flexWrap: "wrap",
    justifyContent: "space-between",
    rowGap: isWeb ? 16 : 20,
  },
  cardsStack: {
    width: "100%",
    flexDirection: "column",
    alignItems: "stretch",
  },
  webStageCard: {
    width: "48%",
  },
  mobileStageCard: {
    width: "100%",
    marginBottom: 20,
  },
});