/* =============================================================================
 * D04_PlanConfirm_UI_Page.ts
 * D04 확정 · 업체 · 내보내기(요구서 345 3-4 · PLAN 531-3) — B05~B09 틀(group_workflow).
 *   본문 = 연도 표(연장 · 시점 · 종점 · 누가 · 확정 · 지정 업체) · 연도마다 업체 여럿
 *     (등록 회사 찾기 = 가입 화면 회사 검색 · 아니면 업체명 + 메일 수기).
 *   좌측 = 확정할 연도 고르기 + [내보내기] [확정] [저장].
 *   조작 = 캐시 `d04-assignees` 즉시 · [저장] = PUT …/plan/assignees(연도 전부 맞춤) → 캐시 비움 ·
 *   [확정] = (캐시 있으면 저장 먼저) POST …/plan/finalize → 잠금판 · [내보내기] = GET …/plan/export zip.
 *   산림청이 아니면(지정 회사 = 보기만) 업체 고침 · 연도 고르기 · [확정] · [저장] 없음 · [내보내기]만.
 * ========================================================================== */

import "./D04_PlanConfirm_UI_Style.css";
import { API_BASE_URL, CURRENT_PROJECT_ID_KEY, ROUTES } from "@config/config_frontend";
import { kstText } from "../common_util/common_util_time_kst";
import {
  createButton,
  createTag,
  el,
  hideLoadingOverlay,
  showConfirmDialog,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import { createPanelCard } from "@ui/ui_template_collapsible";
import { t } from "@ui/ui_template_locale";
import { clearState, readState, writeState } from "../A00_Common/b_page_state";
import { mountGroupStep } from "../A00_Common/group_workflow";
import { fetchSessionUser } from "../A06_Login/A06_Login_Api_Fetch";
import { searchCompanies } from "../A07_Register/A07_Register_Api_Fetch";

interface EndPoint {
  x: number;
  y: number;
  lon: number;
  lat: number;
}

interface YearRow {
  year: number;
  saved: boolean;
  confirmed_at: string | null;
  length_m?: number;
  start_chainage_m?: number;
  end_chainage_m?: number;
  start?: EndPoint;
  end?: EndPoint;
}

interface Assignee {
  year: number;
  company_id: number | null;
  company_name: string | null;
  email: string | null;
  notified_at?: string | null;
  linked_project_id?: string | null;
}

interface Summary {
  name: string;
  years: YearRow[];
  assignees: Assignee[];
}

async function api<T>(path: string, init: RequestInit = {}): Promise<T> {
  const response = await fetch(`${API_BASE_URL}${path}`, {
    credentials: "include",
    headers: init.body ? { "Content-Type": "application/json" } : undefined,
    ...init,
  });
  const data = (await response.json().catch(() => ({}))) as T & { detail?: unknown };
  if (!response.ok) {
    const detail = typeof data.detail === "string" ? data.detail : `HTTP ${response.status}`;
    throw new Error(detail);
  }
  return data;
}

const fmt = (value: number | undefined, digits = 1): string =>
  value === undefined || value === null ? "—" : value.toFixed(digits);
const where = (p?: EndPoint): string => (p ? `${p.lat.toFixed(6)}, ${p.lon.toFixed(6)}` : "—");
/** 같은 업체 — 등록 회사 = id · 수기 = 메일(서버 `_key` 와 같음) */
const sameFirm = (a: Assignee, b: Assignee): boolean =>
  a.year === b.year &&
  (a.company_id !== null
    ? a.company_id === b.company_id
    : b.company_id === null && (a.email ?? "").toLowerCase() === (b.email ?? "").toLowerCase());

export async function renderD04PlanConfirm(root: HTMLElement): Promise<void> {
  const projectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY) ?? "";
  const base = `/projects/${projectId}/plan`;
  const main = el("div", { className: "d04-confirm" });
  const pickList = el("div", { className: "d04-confirm__picks" });
  const pickCard = createPanelCard(t("D04_Panel_Years"), false);
  pickCard.append(pickList);
  const actions = el("div", { className: "ui-sidebar-actions" });
  const panel = el("div", { className: "d04-confirm__panel", children: [pickCard, actions] });
  mountGroupStep(root, ROUTES.D04_PLAN_CONFIRM, { mainContent: main, leftPanel: panel });

  let summary: Summary = { name: "", years: [], assignees: [] };
  let editable = false; // 산림청만 고침
  const draft = (): Assignee[] | null =>
    editable ? readState<Assignee[]>("d04-assignees", projectId) : null;
  const current = (): Assignee[] => draft() ?? summary.assignees;
  const edit = (next: Assignee[]): void => {
    writeState("d04-assignees", next, projectId);
    draw();
  };

  async function load(): Promise<void> {
    summary = await api<Summary>(`${base}/summary`);
    draw();
  }

  async function save(): Promise<void> {
    const body = {
      years: summary.years.map((row) => row.year),
      assignees: current().map(({ year, company_id, company_name, email }) => ({
        year,
        company_id,
        company_name,
        email,
      })),
    };
    await api(`${base}/assignees`, { method: "PUT", body: JSON.stringify(body) });
    clearState("d04-assignees", projectId);
  }

  async function locked(work: () => Promise<void>): Promise<void> {
    showLoadingOverlay();
    try {
      await work();
      await load();
    } catch (error) {
      showToast(error instanceof Error ? error.message : String(error), "error");
    } finally {
      hideLoadingOverlay();
    }
  }

  function addForm(year: number): HTMLElement {
    const listId = `d04-companies-${year}`;
    const options = el("datalist", { attrs: { id: listId } });
    const found = new Map<string, number>();
    const firm = el("input", {
      className: "d04-confirm__input",
      attrs: { list: listId, placeholder: t("D04_Company") },
    });
    const mail = el("input", {
      className: "d04-confirm__input",
      attrs: { type: "email", placeholder: t("D04_Email") },
    });
    firm.addEventListener("input", () => {
      const query = firm.value.trim();
      if (!query) return;
      void searchCompanies(query)
        .then((companies) => {
          found.clear();
          options.replaceChildren(
            ...companies.map((company) => {
              found.set(company.name, company.id);
              return el("option", { attrs: { value: company.name } });
            }),
          );
        })
        .catch(() => undefined);
    });
    const add = createButton({
      label: t("D04_Add"),
      variant: "ghost",
      size: "sm",
      onClick: () => {
        const name = firm.value.trim();
        const email = mail.value.trim() || null;
        const companyId = found.get(name) ?? null;
        if (companyId === null && (!name || !email?.includes("@"))) {
          showToast(t("D04_NeedEmail"), "warning");
          return;
        }
        const next: Assignee = { year, company_id: companyId, company_name: name, email };
        const list = current();
        if (list.some((item) => sameFirm(item, next))) return;
        edit([...list, next]);
      },
    });
    return el("div", { className: "d04-confirm__add", children: [firm, mail, add, options] });
  }

  function firmChip(item: Assignee): HTMLElement {
    const label = [item.company_name, item.email].filter(Boolean).join(" · ");
    const remove = createButton({
      label: "×",
      variant: "ghost",
      size: "sm",
      onClick: () => edit(current().filter((other) => other !== item && !sameFirm(other, item))),
    });
    const tags = [
      item.company_id !== null ? createTag("Aislo", "accent") : null,
      item.notified_at ? createTag(t("D04_Sent"), "success") : null,
      item.linked_project_id ? createTag(t("D04_Linked"), "success") : null,
    ].filter((tag): tag is HTMLSpanElement => tag !== null);
    remove.hidden = !editable;
    return el("div", {
      className: "d04-confirm__firm",
      children: [el("span", { text: label }), ...tags, remove],
    });
  }

  function draw(): void {
    const list = current();
    const head = el("tr", {
      children: [
        "D04_Col_Year",
        "D04_Col_Length",
        "D04_Col_Start",
        "D04_Col_End",
        "D04_Col_Chainage",
        "D04_Col_Confirmed",
        "D04_Col_Assignees",
      ].map((key) => el("th", { text: t(key as Parameters<typeof t>[0]) })),
    });
    const rows = summary.years.map((row) => {
      const firms = list.filter((item) => item.year === row.year).map(firmChip);
      const chain = row.saved
        ? `${fmt(row.start_chainage_m)} ~ ${fmt(row.end_chainage_m)}`
        : t("D04_NotSaved");
      return el("tr", {
        attrs: { "data-year": String(row.year) },
        children: [
          el("td", { text: String(row.year) }),
          el("td", { text: fmt(row.length_m), attrs: { "data-num": "" } }),
          el("td", { text: where(row.start) }),
          el("td", { text: where(row.end) }),
          el("td", { text: chain }),
          el("td", { text: kstText(row.confirmed_at) }),
          el("td", { children: editable ? [...firms, addForm(row.year)] : firms }),
        ],
      });
    });
    const table = el("table", {
      className: "d04-confirm__table",
      children: [el("thead", { children: [head] }), el("tbody", { children: rows })],
    });
    const notes = draft()
      ? [el("p", { className: "d04-confirm__dirty", text: t("D04_Dirty") })]
      : [];
    main.replaceChildren(el("h2", { text: summary.name }), ...notes, table);

    pickList.replaceChildren(
      ...summary.years
        .filter((row) => row.saved)
        .map((row) => {
          const box = el("input", { attrs: { type: "checkbox", value: String(row.year) } });
          box.checked = !row.confirmed_at;
          return el("label", { className: "d04-confirm__pick", children: [box, ` ${row.year}`] });
        }),
    );
  }

  const exportButton = createButton({
    label: t("D04_Export"),
    variant: "ghost",
    onClick: () =>
      void (async () => {
        showLoadingOverlay();
        try {
          const response = await fetch(`${API_BASE_URL}${base}/export`, {
            credentials: "include",
          });
          if (!response.ok) throw new Error(`HTTP ${response.status}`);
          const link = el("a", {
            attrs: {
              href: URL.createObjectURL(await response.blob()),
              download: `${summary.name}_예정노선.zip`,
            },
          });
          link.click();
          URL.revokeObjectURL(link.href);
        } catch (error) {
          showToast(error instanceof Error ? error.message : String(error), "error");
        } finally {
          hideLoadingOverlay();
        }
      })(),
  });
  const finalizeButton = createButton({
    label: t("D04_Finalize"),
    variant: "filled",
    onClick: () =>
      void (async () => {
        const years = [...pickList.querySelectorAll<HTMLInputElement>("input:checked")].map((box) =>
          Number(box.value),
        );
        if (!years.length) {
          showToast(t("D04_FinalizePick"), "warning");
          return;
        }
        if (!(await showConfirmDialog(t("D04_FinalizeAsk"), t("D04_Finalize")))) return;
        await locked(async () => {
          if (draft()) await save();
          const result = await api<{ notifications: { state: string }[] }>(`${base}/finalize`, {
            method: "POST",
            body: JSON.stringify({ years }),
          });
          const counts = new Map<string, number>();
          for (const item of result.notifications) {
            counts.set(item.state, (counts.get(item.state) ?? 0) + 1);
          }
          const text = [...counts].map(([state, n]) => `${state} ${n}`).join(" · ");
          showToast(`${t("D04_Finalized")} ${text || "0"}`, "success");
        });
      })(),
  });
  const saveButton = createButton({
    label: t("D04_Save"),
    variant: "filled",
    onClick: () =>
      void locked(async () => {
        await save();
        showToast(t("D04_Saved"), "success");
      }),
  });
  actions.append(exportButton, finalizeButton, saveButton);

  try {
    editable = !!(await fetchSessionUser())?.is_forest_service;
    pickCard.hidden = finalizeButton.hidden = saveButton.hidden = !editable;
    await load();
  } catch (error) {
    showToast(error instanceof Error ? error.message : String(error), "error");
  }
}