import "./ui_template_workflow_layout.css";
import { ROUTES } from "@config/config_frontend";
import { t } from "./ui_template_locale";
import { createWorkflowOverlays } from "./ui_template_overlay";
import { navigateTo } from "../A00_Common/router";
import { fetchDashboardMe } from "../B01_Dashboard/B01_Dashboard_Api_Fetch";

let dashboardRolePromise: Promise<string> | undefined;

function getDashboardRole(): Promise<string> {
  dashboardRolePromise ??= fetchDashboardMe().then((user) => user.role);
  return dashboardRolePromise;
}

export interface WorkflowStage {
  stage_no: number;
  stage_key: string;
  state: string;
}

export interface WorkflowLayoutOptions {
  title: string;
  steps: string[];
  activeStep: number;
  leftPanel?: HTMLElement;
  mainContent: HTMLElement;
  stages?: WorkflowStage[];
  currentStage?: number;
  routes?: readonly string[];
  onStepClick?: (stepIndex: number, route: string) => void;
}

export interface WorkflowLayoutHandle {
  root: HTMLElement;
  setOptionsOpen: (isOpen: boolean) => void;
  setProgressOpen: (isOpen: boolean) => void;
}

export interface StepBarOptions {
  stages?: WorkflowStage[];
  currentStage?: number;
  routes?: readonly string[];
  compact?: boolean;
  orientation?: "horizontal" | "vertical";
  icons?: readonly string[];
  onStepClick?: (stepIndex: number, route: string) => void;
  /** 목록 최상단에 대시보드 이동 버튼을 단다(진행단계 오버레이 전용). */
  homeButton?: boolean;
}

export const WORKFLOW_STEP_ICONS = ["📁", "🗺️", "🛣️", "📐", "∑", "🏗️", "📄"] as const;

export function createStepBar(
  steps: readonly string[],
  activeStep: number,
  options?: StepBarOptions,
): HTMLElement {
  const bar = document.createElement("div");
  bar.className = "ui-workflow-layout__steps";
  if (options?.compact) bar.classList.add("is-compact");
  if (options?.orientation === "vertical") bar.classList.add("is-vertical");
  // 진행단계 오버레이(세로형) 최상단에 대시보드로 돌아가는 버튼을 둔다(2026-08-04 사용자
  // 지시). 워크플로 단계가 아니라 탈출구라 stage 배지 없이 항상 활성이다.
  if (options?.homeButton) {
    const home = document.createElement("button");
    home.type = "button";
    home.className = "ui-workflow-layout__step is-enabled ui-workflow-layout__step--home";
    const icon = document.createElement("span");
    icon.className = "ui-workflow-layout__step-icon";
    icon.setAttribute("aria-hidden", "true");
    icon.textContent = "🏠";
    const label = document.createElement("span");
    label.className = "ui-workflow-layout__step-label";
    label.textContent = t("Workflow_Step_Dashboard");
    home.append(icon, label);
    home.title = t("Workflow_Step_Dashboard");
    home.addEventListener("click", () => navigateTo(ROUTES.B01_ACCOUNT));
    bar.append(home);
  }
  steps.forEach((step, index) => {
    const button = document.createElement("button");
    button.type = "button";
    button.className = "ui-workflow-layout__step";
    if (index === activeStep) button.classList.add("is-active");
    const iconText = options?.icons?.[index];
    if (iconText) {
      const icon = document.createElement("span");
      icon.className = "ui-workflow-layout__step-icon";
      icon.setAttribute("aria-hidden", "true");
      icon.textContent = iconText;
      const label = document.createElement("span");
      label.className = "ui-workflow-layout__step-label";
      label.textContent = step;
      button.append(icon, label);
    } else {
      button.textContent = step;
    }

    const stage =
      options?.stages?.find((item) => item.stage_no === index) ?? options?.stages?.[index];
    const hasStages = Boolean(options?.stages?.length);
    const isBlockedState = stage?.state === "NOT_STARTED" || stage?.state === "STALE";
    const isEnabled = !hasStages || !isBlockedState || stage?.stage_no === options?.currentStage;
    button.classList.toggle("is-enabled", isEnabled);
    button.disabled = !isEnabled;

    if (index === 1) {
      void getDashboardRole()
        .then((role) => {
          if (role !== "SYSTEM_ADMIN") {
            button.classList.remove("is-enabled");
            button.disabled = true;
            button.title = "시스템 관리자 전용 단계입니다.";
          }
        })
        .catch(() => undefined);
    }

    // state 기반 스타일링 (표시 전용)
    if (stage) {
      const state = stage.state;
      button.classList.add(`state-${state.toLowerCase()}`);
      if (state === "STALE") {
        button.title = t("WF_State_Stale");
      } else if (state === "FAILED") {
        button.title = t("WF_State_Failed");
      } else if (state === "COMPLETE") {
        button.title = t("WF_State_Complete");
      } else if (state === "IN_PROGRESS") {
        button.title = t("WF_State_InProgress");
      } else {
        button.title = t("WF_State_NotStarted");
      }
    }

    if (isEnabled && options?.routes?.[index]) {
      button.addEventListener("click", () => {
        options.onStepClick?.(index, options.routes![index]);
      });
    }

    bar.append(button);
  });
  return bar;
}

export function createWorkflowLayout(options: WorkflowLayoutOptions): WorkflowLayoutHandle {
  const root = document.createElement("div");
  root.className = "ui-workflow-layout";

  const body = document.createElement("div");
  body.className = "ui-workflow-layout__body";

  const main = document.createElement("main");
  main.className = "ui-workflow-layout__main";
  main.append(options.mainContent);
  body.append(main);

  const progressContent = createStepBar(options.steps, options.activeStep, {
    stages: options.stages,
    currentStage: options.currentStage,
    routes: options.routes,
    orientation: "vertical",
    icons: WORKFLOW_STEP_ICONS,
    onStepClick: options.onStepClick,
    homeButton: true,
  });
  const overlays = createWorkflowOverlays({
    title: options.title,
    optionsContent: options.leftPanel,
    progressContent,
    onOptionsOpenChange: (isOpen) => root.classList.toggle("is-options-open", isOpen),
  });

  root.append(body, overlays.root);
  return {
    root,
    setOptionsOpen: overlays.setTitleOpen,
    setProgressOpen: overlays.setProgressOpen,
  };
}