import { useEffect, useMemo, useState } from "react";
import { track } from "../../lib/analytics";
import { Link, useNavigate, useSearchParams } from "react-router-dom";
import { ChevronRight, ChevronLeft, Check } from "lucide-react";
import { toast } from "sonner";
import type { LineItem, Quote } from "../../lib/types";
import { api, ApiError, looksLikeUuid, nextId } from "../../lib/api";
import {
  useAddMaterial,
  useAddProject,
  useAddSupplier,
  useCreateQuote,
  useMaterials,
  useProjects,
  useQuotes,
  useStoreData,
  useSuppliers,
} from "../../hooks";
import { topicByName } from "../../lib/topics";
import { useAppStore } from "../../store";
import { normalize } from "../../lib/normalize";
import { faNum } from "../../lib/formatters";
import { matchMaterial } from "../../lib/quoteUtils";
import { Header, PageLayout } from "../../components/layout/Header";
import { Stepper } from "./Stepper";
import { Step1TopicSupplier } from "./Step1TopicSupplier";
import { Step2LineItems, type ItemDraft, type MaterialRec } from "./Step2LineItems";
import { Step3Termsheets, effectiveCovered, type TsCardDraft } from "./Step3Termsheets";
import { Step4Projects } from "./Step4Projects";
import { Step5Review } from "./Step5Review";
import { Button } from "../../components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "../../components/ui/dialog";
import { useAuthStore } from "../../store/auth";

const TOTAL_STEPS = 5;

// ویزارد ۵ مرحله‌ای افزودن پیشنهاد جدید
export function WizardPage() {
  useStoreData();
  const navigate = useNavigate();
  const [params] = useSearchParams();

  const quotes = useQuotes();
  const suppliers = useSuppliers();
  const materials = useMaterials();
  const projects = useProjects();
  // سطح limited تدارکات: استعلام فقط برای پروژه‌های عضویت — بدون افزودن پروژه جدید
  const user = useAuthStore((s) => s.user);
  const isLimitedProcurement =
    user?.panels?.procurement === "limited" && user?.role !== "admin";
  const memberProjectNames = useMemo(
    () =>
      projects
        .filter((p) => (user?.member_project_ids ?? []).includes(p.id))
        .map((p) => p.name),
    [projects, user],
  );
  const topics = useAppStore((s) => s.topics);
  const createQuote = useCreateQuote();
  const addSupplier = useAddSupplier();
  const addMaterial = useAddMaterial();
  const addProject = useAddProject();

  // ---------- state ----------
  const [currentStep, setCurrentStep] = useState(1);
  const [highestVisited, setHighestVisited] = useState(1);

  const [selectedTopic, setSelectedTopic] = useState("");
  const [supplierName, setSupplierName] = useState("");
  const [newSup, setNewSup] = useState({ location: "", phone: "", contact: "" });
  const [isOfficial, setIsOfficial] = useState(false);
  const [supplierInvalid, setSupplierInvalid] = useState(false);

  const [items, setItems] = useState<ItemDraft[]>(() => [
    { tempId: "it0", cat: "", brand: "", specs: [], qty: null, unit: "", price: null, total: null },
  ]);
  const [cards, setCards] = useState<TsCardDraft[]>(() => [
    { key: "ts0", milestones: [{ when_iso: null, amount: null }] },
  ]);
  const [coverage, setCoverage] = useState<Record<string, string[]>>({});
  const [assignment, setAssignment] = useState<Record<string, string[]>>({});

  const [quoteDate, setQuoteDate] = useState<string | null>(() => {
    return new Date().toISOString();
  });
  const [expiryDate, setExpiryDate] = useState<string | null>(null);
  const [notes, setNotes] = useState("");
  const [proforma, setProforma] = useState<File | null>(null);
  const [emptyFields, setEmptyFields] = useState<{ label: string; step: number }[]>([]);
  const [confirmOpen, setConfirmOpen] = useState(false);

  // ---------- prefill از لینک‌ها (?topic=&supplier=) ----------
  useEffect(() => {
    const t = params.get("topic");
    if (!t) return;
    const topic = topicByName(t, topics);
    if (!topic) return;
    setSelectedTopic(topic.name);
    const sid = params.get("supplier");
    if (sid) {
      const sup = suppliers.find((s) => s.id === sid);
      if (sup && normalize(sup.topic) === normalize(topic.name)) {
        setSupplierName(sup.name);
        setSupplierInvalid(false);
      }
    }
  }, [params, suppliers, topics]);

  // ---------- اعتبارسنجی قبل از ترک هر مرحله ----------
  const completedSteps = useMemo(() => {
    const s = new Set<number>();
    if (selectedTopic && supplierName.trim()) s.add(1);
    if (items.length > 0 && items.some((it) => it.qty != null && it.qty !== 0 && it.price != null && it.price !== 0)) s.add(2);
    if (
      cards.length > 0 &&
      cards.some((card) => (card.milestones || []).some((m) => m.when_iso || (m.amount != null && m.amount !== 0)))
    ) {
      s.add(3);
    }
    if (items.length > 0 && items.every((it) => (assignment[it.tempId] || []).length > 0)) s.add(4);
    if (highestVisited >= 5) s.add(5);
    return s;
  }, [selectedTopic, supplierName, items, cards, coverage, assignment, highestVisited]);

  const goToStep = (n: number) => {
    setCurrentStep(n);
    setHighestVisited((h) => Math.max(h, n));
    track("wizard_step", { step: n, direction: n > currentStep ? "forward" : "back" });
    window.scrollTo({ top: 0, behavior: "smooth" });
  };

  const next = () => {
    goToStep(currentStep + 1);
  };

  const rememberMaterial = (_rec: MaterialRec) => {};

  // ---------- پروژه‌ها ----------
  const projectNames = useMemo(() => {
    const names = new Set<string>(
      isLimitedProcurement
        ? memberProjectNames
        : projects.map((p) => p.name),
    );
    quotes.forEach((q) => {
      if (q.project) names.add(q.project);
      (q.projects || []).forEach((n) => names.add(n));
    });
    return [...names];
  }, [projects, quotes, isLimitedProcurement, memberProjectNames]);

  const assign = (tempId: string, proj: string) => {
    setAssignment((a) => {
      const cur = a[tempId] || [];
      if (cur.includes(proj)) return a;
      return { ...a, [tempId]: [...cur, proj] };
    });
  };

  const unassign = (tempId: string, proj: string) => {
    setAssignment((a) => {
      const cur = (a[tempId] || []).filter((p) => p !== proj);
      const next = { ...a };
      if (cur.length) next[tempId] = cur;
      else delete next[tempId];
      return next;
    });
  };

  // ---------- خلاصه مرحله ۵ ----------
  const review = useMemo(() => {
    let grandTotal = 0;
    items.forEach((it) => {
      const t = it.total;
      if (t) grandTotal += t;
    });
    const projSet = new Set<string>();
    items.forEach((it) => (assignment[it.tempId] || []).forEach((p) => projSet.add(p)));
    const coveredTempIds = new Set<string>();
    cards.forEach((card) =>
      effectiveCovered(cards, coverage, items, card.key).forEach((tid) => coveredTempIds.add(tid)),
    );
    const orphanCount = items.filter((it) => !coveredTempIds.has(it.tempId)).length;
    return {
      supplierName: supplierName.trim() || "—",
      topicName: selectedTopic || "—",
      projects: [...projSet],
      itemCount: items.length,
      tsCount: cards.length,
      grandTotal,
      isOfficial,
      orphanCount,
    };
  }, [items, assignment, cards, coverage, supplierName, selectedTopic, isOfficial]);

  // ---------- ذخیره ----------
  const doSave = async () => {
    const resolveErrorTarget = (err: unknown): { step: number; field?: string } => {
      let field = "";
      let msg = "";
      if (err instanceof ApiError) {
        field = err.field || "";
        msg = err.message || "";
      } else if (err instanceof Error) {
        msg = err.message || "";
        if ("field" in err && typeof (err as any).field === "string") {
          field = (err as any).field;
        }
      }

      const combined = `${field} ${msg}`.toLowerCase();

      if (/supplier|تأمین|تامین/i.test(combined)) return { step: 1, field: "supplier_id" };
      if (/line_item|material|canonical_unit|unit_id|quantity|متریال|واحد|قلم|تعداد/i.test(combined)) {
        return { step: 2, field: field || "line_items" };
      }
      if (/termsheet|item_termsheet|schedule_step|due_date|milestone|ترم|پرداخت|پوشش|سررسید/i.test(combined)) {
        return { step: 3, field: field || "termsheets" };
      }
      if (/project|پروژه/i.test(combined)) return { step: 4, field: "project" };
      if (/expiry_date|تاریخ انقضا/i.test(combined)) return { step: 5, field: "expiry_date" };
      if (/quote_date|تاریخ پیشنهاد/i.test(combined)) return { step: 5, field: "quote_date" };
      if (/proforma|پیش‌فاکتور/i.test(combined)) return { step: 5, field: "proforma" };
      if (/notes|یادداشت/i.test(combined)) return { step: 5, field: "notes" };

      return { step: 5, field };
    };

    const sectionError = (stepOrTarget: number | { step: number; field?: string }, title: string, err: unknown) => {
      const target = typeof stepOrTarget === "number" ? { step: stepOrTarget } : stepOrTarget;
      const msg = err instanceof Error ? err.message : "خطای ناشناخته";
      toast.error(`${title}: ${msg}`, {
        duration: 8000,
        action: {
          label: "رفع خطا",
          onClick: () => {
            goToStep(target.step);
            setTimeout(() => {
              const targetAttr = target.field ? `[data-field="${target.field}"]` : "";
              const el = (targetAttr ? document.querySelector(targetAttr) : null) ||
                document.querySelector(`[data-step="${target.step}"]`);
              if (el instanceof HTMLElement) {
                el.scrollIntoView({ behavior: "smooth", block: "center" });
                const input = el.querySelector("input, textarea, select") as HTMLElement | null;
                if (input) input.focus();
                else el.focus?.();
                el.classList.add("ring-2", "ring-red-500", "rounded-xl");
                setTimeout(() => el.classList.remove("ring-2", "ring-red-500", "rounded-xl"), 3500);
              }
            }, 150);
          },
        },
      });
    };

    const name = supplierName.trim();
    let supplierId = "";
    if (name) {
      const exist = suppliers.find((s) => normalize(s.name) === normalize(name));
      if (exist) {
        supplierId = exist.id;
      } else {
        try {
          const created = await addSupplier.mutateAsync({
            id: nextId("s", suppliers),
            topic: selectedTopic,
            categories: [],
            name,
            location: newSup.location.trim(),
            phone: newSup.phone.trim(),
            contact: newSup.contact.trim(),
          });
          supplierId = created.id;
        } catch (err) {
          sectionError(1, "خطا در بخش تأمین‌کننده", err);
          return;
        }
      }
    }

    const collected: { li: LineItem; tempId: string }[] = [];
    for (const it of items) {
      const cat = it.cat.trim();
      const brand = it.brand.trim();
      const specs = it.specs;
      const unit = it.unit.trim();
      const qty = it.qty;
      const price = it.price;
      const total = it.total;
      if (!cat && !brand && qty == null && price == null) continue;

      const wantName = (cat || brand || specs.join(" ") || "").trim() || "کالای جدید";
      let material = materials.find((m) => looksLikeUuid(m.id) && normalize(m.name) === normalize(wantName));
      if (!material) {
        const matched = matchMaterial(
          materials.filter((m) => looksLikeUuid(m.id)),
          cat,
          brand,
          specs,
        );
        if (matched) material = matched;
      }
      let materialId: string;
      if (material && looksLikeUuid(material.id)) {
        materialId = material.id;
      } else {
        try {
          const created = await addMaterial.mutateAsync({
            id: nextId("m", materials),
            name: wantName,
            topic: selectedTopic,
            brand,
            specs,
            base_unit: unit || "عدد",
          });
          materialId = created.id;
        } catch (err) {
          sectionError(2, "خطا در بخش اقلام (متریال)", err);
          return;
        }
      }

      collected.push({
        li: {
          id: "li-" + (collected.length + 1),
          material_id: materialId,
          quantity: qty,
          unit,
          unit_price: price,
          total_price: total,
          termsheet_ids: [],
          accepted_ts_id: null,
          rejected: false,
          arrived_date: null,
        },
        tempId: it.tempId,
      });
    }

    const lineItems = collected.map((c) => c.li);

    const termsheets = cards
      .map((card, i) => ({
        id: "new-ts-" + (i + 1),
        label: "گزینه " + faNum(i + 1),
        milestones: card.milestones.filter((m) => m.when_iso || m.amount != null),
        status: "offered" as const,
      }))
      .filter((t) => t.milestones.length);

    collected.forEach(({ li, tempId }) => {
      const ids = cards
        .map((card, i) =>
          effectiveCovered(cards, coverage, items, card.key).includes(tempId) ? "new-ts-" + (i + 1) : "",
        )
        .filter(Boolean);
      const valid = ids.filter((tid) => termsheets.some((t) => t.id === tid));
      li.termsheet_ids = valid.length ? valid : termsheets.length ? [termsheets[0].id] : [];
    });

    const projSet = new Set<string>();
    collected.forEach(({ li, tempId }) => {
      const list = assignment[tempId] || [];
      li.projects = list.map((p) => ({ id: "", name: p }));
      list.forEach((p) => projSet.add(p));
    });
    const projectsList = [...projSet];

    const quoteIso = quoteDate || new Date().toISOString();
    const quote: Quote = {
      id: nextId("q", quotes),
      supplier_id: supplierId,
      project: projectsList[0] || "",
      projects: projectsList,
      quote_date: quoteIso,
      expiry_date: expiryDate,
      accepted_date: null,
      arrived_date: null,
      status: "offered",
      is_official: isOfficial,
      proformas: [],
      invoices: [],
      events: [{ type: "offered", occurred_at: quoteIso }],
      notes: notes.trim(),
      line_items: lineItems,
      termsheets,
    };

    try {
      const created = await createQuote.mutateAsync(quote);
      if (proforma) {
        try {
          await api.files.upload(created.id, "proforma", proforma);
        } catch (err) {
          toast.error(`خطا در آپلود پیش‌فاکتور: ${err instanceof Error ? err.message : "خطای ناشناخته"}`, {
            action: { label: "رفع خطا", onClick: () => goToStep(5) },
          });
        }
      }
      toast.success("پیشنهاد ذخیره شد.");
      track("quote_submitted", { quote_id: created.id, items: lineItems.length });
      navigate("/");
    } catch (e) {
      const target = resolveErrorTarget(e);
      sectionError(target, "خطا در ثبت پیشنهاد", e);
    }
  };

  const save = () => {
    const incomplete: { label: string; step: number }[] = [];
    if (!completedSteps.has(1)) incomplete.push({ label: "تأمین‌کننده", step: 1 });
    if (!completedSteps.has(2)) incomplete.push({ label: "اقلام", step: 2 });
    if (!completedSteps.has(3)) incomplete.push({ label: "شرایط پرداخت", step: 3 });
    if (!completedSteps.has(4)) incomplete.push({ label: "پروژه", step: 4 });
    if (incomplete.length > 0) {
      setEmptyFields(incomplete);
      setConfirmOpen(true);
      return;
    }
    void doSave();
  };

  return (
    <div className="min-h-screen pb-10">
      <Header
        title="افزودن پیشنهاد جدید"
        sub="اطلاعات را از تماس با تأمین‌کننده وارد کنید"
        backTo="/"
        backLabel="بازگشت به دفتر"
      />
      <PageLayout>
        {/* نوار مراحل استپر */}
        <Stepper current={currentStep} highestVisited={highestVisited} completedSteps={completedSteps} onGoto={goToStep} />

        {/* محتوای مراحل با پدینگ ریسپانسیو و بهینه برای موبایل */}
        {currentStep === 1 && (
          <div data-step="1" className="rounded-xl border border-line bg-panel p-3.5 sm:p-5 shadow-xs">
            <Step1TopicSupplier
              selectedTopic={selectedTopic}
              onTopicSelect={(t) => {
                setSelectedTopic(t);
                setSupplierName("");
                setNewSup({ location: "", phone: "", contact: "" });
                setIsOfficial(false);
                setSupplierInvalid(false);
              }}
              supplierName={supplierName}
              onSupplierName={(v) => {
                setSupplierName(v);
                setSupplierInvalid(false);
              }}
              newSup={newSup}
              onNewSup={(p) => setNewSup((s) => ({ ...s, ...p }))}
              isOfficial={isOfficial}
              onOfficial={setIsOfficial}
              invalid={supplierInvalid}
            />
          </div>
        )}
        {currentStep === 2 && (
          <div data-step="2" className="rounded-xl border border-line bg-panel p-3.5 sm:p-5 shadow-xs">
            <Step2LineItems items={items} onItemsChange={setItems} selectedTopic={selectedTopic} onRemember={rememberMaterial} />
          </div>
        )}
        {currentStep === 3 && (
          <div data-step="3" className="rounded-xl border border-line bg-panel p-3.5 sm:p-5 shadow-xs">
            <Step3Termsheets
              cards={cards}
              onCardsChange={setCards}
              items={items}
              coverage={coverage}
              onCoverageChange={(key, ids) => setCoverage((c) => ({ ...c, [key]: ids }))}
            />
          </div>
        )}
        {currentStep === 4 && (
          <div data-step="4" className="rounded-xl border border-line bg-panel p-3.5 sm:p-5 shadow-xs">
            <Step4Projects
              items={items}
              projects={projectNames}
              assignment={assignment}
              onAssign={assign}
              onUnassign={unassign}
              canAddProject={!isLimitedProcurement}
              onAddProject={(name) => {
                void addProject.mutateAsync({ id: nextId("p", projects), name });
              }}
            />
          </div>
        )}
        {currentStep === 5 && (
          <div data-step="5" className="rounded-xl border border-line bg-panel p-3.5 sm:p-5 shadow-xs">
            <Step5Review
              quoteDate={quoteDate}
              onQuoteDate={setQuoteDate}
              expiryDate={expiryDate}
              onExpiryDate={setExpiryDate}
              notes={notes}
              onNotes={setNotes}
              proforma={proforma}
              onProforma={setProforma}
              summary={review}
            />
          </div>
        )}

        {/* پاورقی کنترل مراحل */}
        <div className="mt-4 flex items-center justify-between rounded-xl border border-line bg-panel p-3 sm:p-3.5 shadow-xs">
          <div>
            {currentStep > 1 && (
              <button
                type="button"
                onClick={() => goToStep(currentStep - 1)}
                className="inline-flex items-center gap-1 px-3 sm:px-4 py-2 rounded-xl border border-slate-200 dark:border-zinc-700 bg-white dark:bg-zinc-800 text-slate-700 dark:text-zinc-200 hover:bg-slate-50 text-xs sm:text-sm font-medium transition-colors shadow-2xs"
              >
                <ChevronRight className="h-4 w-4" />
                <span>قبلی</span>
              </button>
            )}
          </div>

          <div className="flex items-center gap-2 sm:gap-3">
            <Link
              to="/"
              className="inline-flex items-center justify-center px-3 sm:px-4 py-2 rounded-xl text-xs sm:text-sm font-medium text-slate-500 hover:text-slate-700 no-underline"
            >
              انصراف
            </Link>

            {currentStep < TOTAL_STEPS && (
              <button
                type="button"
                onClick={next}
                className="inline-flex items-center gap-1 px-4 sm:px-6 py-2 rounded-xl bg-blue-600 hover:bg-blue-700 active:bg-blue-800 text-white text-xs sm:text-sm font-semibold shadow-xs transition-all"
              >
                <span>بعدی</span>
                <ChevronLeft className="h-4 w-4" />
              </button>
            )}

            {currentStep === TOTAL_STEPS && (
              <button
                type="button"
                onClick={() => void save()}
                className="inline-flex items-center gap-1 px-4 sm:px-6 py-2 rounded-xl bg-emerald-600 hover:bg-emerald-700 active:bg-emerald-800 text-white text-xs sm:text-sm font-semibold shadow-xs transition-all"
              >
                <span>ذخیره پیشنهاد</span>
                <Check className="h-4 w-4" />
              </button>
            )}
          </div>
        </div>

        {/* دیالوگ فیلدهای خالی */}
        <Dialog open={confirmOpen} onOpenChange={setConfirmOpen}>
          <DialogContent>
            <DialogHeader>
              <DialogTitle>فیلدهای خالی</DialogTitle>
            </DialogHeader>
            <div className="text-[13.5px] leading-7 text-gray-700">
              هنوز تعدادی از فیلدها خالی هستند. آیا مطمئنید که می‌خواهید ادامه دهید؟
            </div>
            <div className="flex flex-wrap gap-x-3 gap-y-1 text-[13px]">
              {emptyFields.map((f) => (
                <button
                  key={f.step}
                  type="button"
                  className="cursor-pointer text-blue-600 underline underline-offset-2 hover:text-blue-800"
                  onClick={() => {
                    setConfirmOpen(false);
                    goToStep(f.step);
                  }}
                >
                  {f.label}
                </button>
              ))}
            </div>
            <DialogFooter className="sm:justify-between">
              <Button
                variant="green"
                onClick={() => {
                  setConfirmOpen(false);
                  void doSave();
                }}
              >
                ذخیره کردن
              </Button>
              <Button
                className="bg-red text-white hover:brightness-95"
                onClick={() => {
                  setConfirmOpen(false);
                  goToStep(emptyFields[0]?.step ?? 1);
                }}
              >
                تکمیل فیلدها
              </Button>
            </DialogFooter>
          </DialogContent>
        </Dialog>
      </PageLayout>
    </div>
  );
}