"use client";

import Image from "next/image";
import { useRouter } from "next/navigation";
import { useEffect, useMemo, useState } from "react";
import { IoClose } from "react-icons/io5";
import { getSubmitPath } from "@/lib/get-submit-path";
import {
  getLocalSectionProgress,
  getStoredAge,
} from "@/components/Componentes/progress-helper";
import QuestionCard from "@/components/Componentes/question-card";
import RequiredStepsCard from "@/components/Componentes/required-steps-card";
import Button from "@/components/Componentes/button";
import InformationSheet from "@/components/Componentes/information-sheet";
import NavigationButton from "@/components/Componentes/navigation-button";
import { PageBackground } from "@/components/Componentes/page-background";
import ErrorToast from "@/components/Componentes/error-toast";
import {
  getQuestionListItems,
  isQuestionListItemVisibleForProfile,
  type QuestionListItem,
} from "@/data/question-data";
import { toFrontendSlug } from "@/data/section-slug-map";
import { useQueryClient } from "@tanstack/react-query";
import { useStartMarriageMatchMutation } from "@/hooks/marriage/use-match-start";
import { useMarriageProfileQuery } from "@/hooks/marriage/use-profile-main";
import { useMarriageSectionsQuery } from "@/hooks/marriage/use-sections";
import { useCloseServiceOnBack } from "@/hooks/use-close-service-on-back";
import {
  clearMatchStartGrace,
  markMatchStarted,
} from "@/lib/match-start-grace";
import { localizePath } from "@/translations/config";
import { useI18n } from "@/translations/provider";
import SectionsRequest from "./sections-request";

export default function QuestionsListPage() {
  useCloseServiceOnBack();
  const { dictionary: t, locale } = useI18n();
  const router = useRouter();
  const queryClient = useQueryClient();
  const { data: profile } = useMarriageProfileQuery();
  const { data: sections } = useMarriageSectionsQuery({
    refetchOnMount: "always",
  });


  const startMatchMutation = useStartMarriageMatchMutation({
    onSuccess: () => {
      markMatchStarted();
      router.push(localizePath("/finding-match", locale));
    },
    onError: () => {
      // Never pretend the request went through – the user stays here and can
      // retry instead of being parked on the waiting screen forever.
      clearMatchStartGrace();
    },
  });
  const [isOptionalInfoSheetOpen, setIsOptionalInfoSheetOpen] = useState(false);
  const [selectedSection, setSelectedSection] =
    useState<QuestionListItem | null>(null);
  const questionListItems = useMemo(
    () =>
      getQuestionListItems(locale).filter((item) =>
        isQuestionListItemVisibleForProfile(item, {
          gender: profile?.gender,
        }),
      ),
    [locale, profile?.gender],
  );

  const sectionProgressBySlug = useMemo(() => {
    const progressBySlug = new Map<string, number>();
    const age = getStoredAge();

    sections?.forEach((section) => {
      const frontendSlug = toFrontendSlug(section.slug);
      const progress = Math.max(
        0,
        Math.min(100, Math.round(section.completion_percent)),
      );
      progressBySlug.set(frontendSlug, progress);
      progressBySlug.set(section.slug, progress);
    });

    const fbSec = sections?.find((s) => s.slug === "family_background");
    const mhSec = sections?.find((s) => s.slug === "marital_history");
    if (fbSec || mhSec) {
      const fbTotal = fbSec?.total_steps ?? 6;
      const fbCurrent = fbSec
        ? Math.round((fbSec.completion_percent / 100) * fbTotal)
        : 0;
      const mhTotal = mhSec?.total_steps ?? 6;
      const mhCurrent = mhSec
        ? Math.round((mhSec.completion_percent / 100) * mhTotal)
        : 0;
      const combinedProgress =
        fbTotal + mhTotal > 0
          ? ((fbCurrent + mhCurrent) / (fbTotal + mhTotal)) * 100
          : 0;
      progressBySlug.set(
        "family_marital_history",
        Math.max(0, Math.min(100, Math.round(combinedProgress))),
      );
    }

    questionListItems.forEach((item) => {
      const localProgress = getLocalSectionProgress(item, profile, age);
      if (localProgress !== null) {
        progressBySlug.set(item.slug, localProgress);
      }
    });

    return progressBySlug;
  }, [sections, questionListItems, profile]);

  const requiredQuestionListItems = useMemo(
    () => questionListItems.filter((item) => Boolean(item.required)),
    [questionListItems],
  );

  const allRequiredSectionsCompleted = useMemo(() => {
    if (requiredQuestionListItems.length === 0) {
      return false;
    }

    return requiredQuestionListItems.every((item) => {
      const progress = sectionProgressBySlug.get(item.slug) ?? 0;
      return progress >= 100;
    });
  }, [requiredQuestionListItems, sectionProgressBySlug]);

  const profileStatus = profile?.status;
  const isProfileSuspended = profileStatus === "suspended";
  const isProfileBlocked =
    profileStatus === "in_case" ||
    profileStatus === "matched";
  const canStartMatch =
    !isProfileSuspended && !isProfileBlocked && allRequiredSectionsCompleted;
  const [isSyncError, setIsSyncError] = useState(false);
  const [isSyncing, setIsSyncing] = useState(false);
  const [toastMessage, setToastMessage] = useState<string | null>(null);

  useEffect(() => {
    if (startMatchMutation.isError || isSyncError) {
      setToastMessage(t.questions.startMatchFailed);
    }
  }, [startMatchMutation.isError, isSyncError, t.questions.startMatchFailed]);

  const handleCloseToast = () => {
    setToastMessage(null);
    setIsSyncError(false);
    startMatchMutation.reset();
  };

  const isStartMatchDisabled =
    startMatchMutation.isPending || isSyncing || !canStartMatch;

  const hasIncompleteOptionalSections = useMemo(() => {
    return questionListItems.some(
      (item) =>
        !item.required && (sectionProgressBySlug.get(item.slug) ?? 0) < 100,
    );
  }, [questionListItems, sectionProgressBySlug]);

  const handleStartMatch = async () => {
    if (isStartMatchDisabled || isSyncing) {
      return;
    }

    setIsSyncing(true);
    setIsSyncError(false);

    try {
      const slugsToCheck = [
        "personal_info",
        "contact_residence_family_communication",
        "appearance_health_activity",
        "education_career_economic_status",
        "family_marital_history",
        "beliefs_lifestyle_boundaries",
        "future_spouse_criteria",
        "identity_verification",
      ];

      for (const slug of slugsToCheck) {
        const rawValue = window.localStorage.getItem(
          `marriage:sections:${slug}:answers`,
        );
        if (rawValue) {
          const storedValue = JSON.parse(rawValue);
          if (storedValue.pending_sync && storedValue.fields) {
            const payload = {
              current_step: storedValue.current_step,
              fields: storedValue.fields,
            };
            const { updateMarriageSectionData } = await import(
              "@/hooks/marriage/use-section-data"
            );
            await updateMarriageSectionData(slug, payload);

            storedValue.pending_sync = false;
            window.localStorage.setItem(
              `marriage:sections:${slug}:answers`,
              JSON.stringify(storedValue),
            );
          }
        }
      }

      await queryClient.invalidateQueries();
      startMatchMutation.mutate();
    } catch (err) {
      console.error("Failed to sync pending sections:", err);
      setIsSyncError(true);
    } finally {
      setIsSyncing(false);
    }
  };

  return (
    <>
      {toastMessage && (
        <ErrorToast message={toastMessage} onClose={handleCloseToast} />
      )}
      {isOptionalInfoSheetOpen ? (
        <InformationSheet
          icon="warning"
          title={t.questions.optionalInfoPromptTitle}
          description={
            <p className="px-0.5 text-sm leading-[1.45] text-[#2D2D2D]">
              {t.questions.optionalInfoPromptDescription}
            </p>
          }
          onClose={() => setIsOptionalInfoSheetOpen(false)}
          buttons={({ close }) => (
            <div className="grid w-full grid-cols-[1fr_2fr] gap-3">
              <Button
                className="rounded-[11px] border border-[#9B9B9B] bg-transparent py-[18px] text-[#8B8B8B]"
                onClick={close}
                variant="outlined"
              >
                {t.common.cancel}
              </Button>
              <Button
                className="rounded-[11px] py-[18px]"
                disabled={isStartMatchDisabled}
                onClick={() => {
                  close();
                  handleStartMatch();
                }}
              >
                {t.questions.findingMatch}
              </Button>
            </div>
          )}
        />
      ) : null}
      {selectedSection ? (
        <InformationSheet
          icon={null}
          title={({ close }) => (
            <span className="flex w-full items-start justify-between gap-3 text-left">
              <span className="group-14 leading-5 font-bold tracking-normal text-[#8B8B8B]">
                {selectedSection.title}
              </span>
              <button
                type="button"
                aria-label={`Close ${selectedSection.title} explanation`}
                className="-mt-0.5 flex size-6 shrink-0 items-center justify-center text-[#8F8F8F]"
                onClick={close}
              >
                <IoClose aria-hidden="true" className="text-[22px]" />
              </button>
            </span>
          )}
          description={
            <p className="px-0.5 group-14 leading-[1.45] text-[#2D2D2D]">
              {selectedSection.summary}
            </p>
          }
          onClose={() => setSelectedSection(null)}
          className="text-left"
        />
      ) : null}
      <SectionsRequest />
      <PageBackground disabled />

      <main
        style={{ paddingBottom: "calc(100px + var(--safe-bottom))" }}
        className="-mx-[17px] relative min-h-screen overflow-x-clip bg-[#F5F5F5] px-[17px] pt-0"
      >
        <div className="pointer-events-none absolute inset-x-0 top-0 h-[240px] bg-[radial-gradient(circle_at_top,rgba(255,255,255,0.98)_0%,rgba(255,255,255,0.7)_42%,rgba(255,255,255,0)_100%)]" />
        <div className="pointer-events-none absolute -top-16 left-1/2 h-[220px] w-[220px] -translate-x-1/2 rounded-full bg-white/70 blur-3xl" />

        <header
          style={{ paddingTop: "calc(var(--safe-top) + 16px)" }}
          className="sticky top-0 z-20 -mx-[17px] flex items-center justify-between bg-[#F5F5F5]/90 px-[17px] pb-3 backdrop-blur-md"
        >
          <NavigationButton
            icon="back"
            iconLabel={t.questions.closeQuestionsList}
            onClick={(e) => {
              e.preventDefault();
              if (typeof window !== "undefined" && (window as any).HabibApp) {
                (window as any).HabibApp.postMessage(
                  JSON.stringify({ action: "close_service" }),
                );
              } else {
                router.push("/");
              }
            }}
          />
          <h1 className="group-16 font-semibold text-[#151515]">
            {t.questions.profileRegistration}
          </h1>
          <NavigationButton
            icon="document"
            iconLabel={t.common.support}
            className="shadow-[0_10px_26px_rgba(15,23,42,0.05)]"
          />
        </header>

        <div className="relative">
          <div className="mt-4">
            <RequiredStepsCard
              items={questionListItems}
              progressBySlug={sectionProgressBySlug}
            />
          </div>

          <section className="mt-5 space-y-3">
            {questionListItems.map((item) => (
              <QuestionCard
                key={item.slug}
                item={item}
                progress={sectionProgressBySlug.get(item.slug) ?? null}
                onInfoClick={(section) => setSelectedSection(section)}
              />
            ))}
          </section>
        </div>

        <div
          style={{ paddingBottom: "calc(16px + var(--safe-bottom))" }}
          className="fixed inset-x-0 bottom-0 z-20 mx-auto w-full max-w-[375px] bg-[#F5F5F5]/95 px-[17px] pt-3 backdrop-blur-md"
        >
          <Button
            aria-label={t.questions.findMatches}
            disabled={isStartMatchDisabled}
            isLoading={startMatchMutation.isPending || isSyncing}
            onClick={() => {
              if (hasIncompleteOptionalSections) {
                setIsOptionalInfoSheetOpen(true);
                return;
              }

              handleStartMatch();
            }}
          >
            <span className="flex items-center justify-center gap-2.5">
              <Image
                src="/assets/images/noun-wedding-rings-6540466 1.svg"
                alt=""
                aria-hidden="true"
                width={28}
                height={28}
                className="shrink-0"
              />
              <span className="leading-none font-semibold">
                {t.questions.findingMatch}
              </span>
            </span>
          </Button>
        </div>
      </main>
    </>
  );
}