/* =============================================================================
 * B01_Dashboard_UI_Home_Many.ts
 * 홈 4 넘음 부품(PLAN 547-2) — 팀원별 · 단계 분포(4~8) · 요약 숫자 · 막대 · 원 그래프(9 넘음)
 *   그래프 = 인라인 SVG(새 라이브러리 없음) · 색 = 셸 · 테마 변수(CSS 클래스)
 * ========================================================================== */

import { createButton, el } from "@ui/ui_template_elements";
import type { HomeData, ProjectSummary } from "./B01_Dashboard_Api_Home";
import { kindClass, kindLabel, type Go } from "./B01_Dashboard_UI_Home_Cards";
import {
  countBy,
  donutArcs,
  isStale,
  stageBuckets,
  topWithRest,
} from "./logic/B01_Dashboard_Home_Layout";

const SVG = "http://www.w3.org/2000/svg";

function svgNode(tag: string, attrs: Record<string, string | number>): SVGElement {
  const node = document.createElementNS(SVG, tag);
  for (const [k, v] of Object.entries(attrs)) node.setAttribute(k, String(v));
  return node;
}

export function pane(titleText: string, ...children: (HTMLElement | SVGElement)[]): HTMLElement {
  const node = el("div", {
    className: "b01-home__pane",
    children: [el("h3", { className: "b01-home__pane-title", text: titleText })],
  });
  node.append(...children);
  return node;
}

const ownerOf = (card: ProjectSummary): string => card.owner_names[0] ?? "담당 없음";

/** 팀원별 진행 중 개수 */
export function memberPane(cards: ProjectSummary[]): HTMLElement {
  const rows = countBy(cards, ownerOf).map(({ label, count }) =>
    el("div", {
      className: "b01-home__member",
      children: [
        el("span", { className: "b01-home__avatar", text: label.slice(0, 1) }),
        el("span", { text: label }),
        el("span", { className: "b01-home__muted b01-home__push", text: `${count} 개` }),
      ],
    }),
  );
  return pane("팀원별", ...rows);
}

/** 단계 분포 — 시작 전 · 설계 중 · 확정 대기 · 쌓은 막대 */
export function stagePane(cards: ProjectSummary[]): HTMLElement {
  const b = stageBuckets(cards);
  const total = Math.max(1, cards.length);
  const parts: [number, string, string][] = [
    [b.start, "start", "시작 전"],
    [b.working, "working", "설계 중"],
    [b.last, "last", "확정 대기"],
  ];
  const bar = el("div", { className: "b01-home__stack" });
  for (const [n, cls, label] of parts) {
    if (!n) continue;
    const seg = el("i", {
      className: `b01-home__stack--${cls}`,
      attrs: { title: `${label} ${n}` },
    });
    seg.style.width = `${(n / total) * 100}%`;
    bar.append(seg);
  }
  const text = parts.map(([n, , label]) => `${label} ${n}`).join(" · ");
  const stale = cards.filter(isStale).length;
  const legend = el("div", { className: "b01-home__muted", text });
  const children: HTMLElement[] = [bar, legend];
  if (stale)
    children.push(
      el("div", { className: "b01-home__stale", text: `14 일 넘게 그대로 ${stale} 개` }),
    );
  return pane("단계 분포", ...children);
}

function kpi(label: string, value: string, note?: string, warn = false): HTMLElement {
  return el("div", {
    className: "b01-home__kpi",
    children: [
      el("div", { className: "b01-home__muted", text: label }),
      el("b", { className: warn ? "b01-home__alert" : "", text: value }),
      ...(note ? [el("span", { className: "b01-home__muted", text: note })] : []),
    ],
  });
}

/** 가로 막대 — 회사별(시스템 관리자) · 담당별(그 밖) · 앞 4 + 그 밖 */
function barChart(rows: { label: string; count: number; rest?: number }[]): SVGElement {
  const shown = topWithRest(rows, 5);
  const max = Math.max(1, ...shown.map((r) => r.count));
  const rowH = 22;
  const svg = svgNode("svg", {
    class: "b01-home__bars",
    viewBox: `0 0 320 ${shown.length * rowH}`,
    width: "100%",
    preserveAspectRatio: "xMinYMin meet",
    role: "img",
  });
  shown.forEach((r, i) => {
    const y = i * rowH;
    const label = r.rest ? `그 밖 ${r.rest} 곳` : r.label;
    const width = (r.count / max) * 180;
    const text = svgNode("text", { x: 0, y: y + 14 });
    text.textContent = label.length > 9 ? `${label.slice(0, 9)}…` : label;
    const count = svgNode("text", { x: 96 + width, y: y + 14 });
    count.textContent = String(r.count);
    svg.append(
      text,
      svgNode("rect", { x: 90, y: y + 4, width, height: 12, rx: 3, class: r.rest ? "rest" : "" }),
      count,
    );
  });
  return svg;
}

/** 원 그래프 — 종류별 · 가운데 = 합 */
function kindDonut(cards: ProjectSummary[]): HTMLElement {
  const kinds = countBy(cards, (c) => c.kind);
  const arcs = donutArcs(kinds.map((k) => k.count));
  const svg = svgNode("svg", {
    class: "b01-home__donut",
    viewBox: "0 0 42 42",
    width: 96,
    height: 96,
  });
  kinds.forEach((k, i) => {
    svg.append(
      svgNode("circle", {
        cx: 21,
        cy: 21,
        r: 15.9155,
        class: kindClass(k.label),
        "stroke-dasharray": arcs[i].dash,
        "stroke-dashoffset": arcs[i].offset,
      }),
    );
  });
  const sum = svgNode("text", { x: 21, y: 24, "text-anchor": "middle" });
  sum.textContent = String(cards.length);
  svg.append(sum);
  const legend = el("div", {
    className: "b01-home__legend",
    children: kinds.map((k) =>
      el("span", {
        children: [
          el("i", { className: `b01-home__swatch ${kindClass(k.label)}` }),
          `${kindLabel(k.label)} ${k.count}`,
        ],
      }),
    ),
  });
  return el("div", {
    className: "b01-home__donut-row",
    children: [svg as unknown as HTMLElement, legend],
  });
}

/** 9 넘음 — 요약 숫자 · 회사별(담당별) 막대 · 종류 원 · 단계 분포 · [모든 프로젝트 ›] */
export function manyView(data: HomeData, go: Go): HTMLElement {
  const cards = data.projects;
  const sys = data.system;
  const pending = data.todos.join_requests ?? 0;
  const kpis = el("div", { className: "b01-home__kpis" });
  if (sys) kpis.append(kpi("회사", String(sys.companies)), kpi("사용자", String(sys.users)));
  kpis.append(kpi("진행 중 프로젝트", String(cards.length), `전체 ${data.project_total}`));
  if (data.todos.join_requests !== undefined)
    kpis.append(
      kpi("처리 대기", String(pending), pending ? `가입 ${pending}` : undefined, pending > 0),
    );
  if (sys) {
    const s = sys.server;
    const disk = s.disk ?? 0;
    kpis.append(
      kpi(
        "서버",
        `디스크 ${Math.round(disk)}%`,
        `CPU ${Math.round(s.cpu ?? 0)} · 메모리 ${Math.round(s.memory ?? 0)}`,
        disk >= 85,
      ),
    );
  }
  const rows = sys
    ? countBy(cards, (c) => sys.company_names[String(c.company_id)] ?? "회사 없음")
    : countBy(cards, (c) => c.owner_names[0] ?? "담당 없음");
  const all = createButton({ label: "모든 프로젝트 ›", onClick: () => go("projects") });
  return el("div", {
    className: "b01-home__many",
    children: [
      kpis,
      el("div", {
        className: "b01-home__split",
        children: [
          pane(sys ? "회사별 진행 중" : "담당별 진행 중", barChart(rows)),
          pane("종류", kindDonut(cards)),
        ],
      }),
      stagePane(cards),
      el("div", { className: "b01-home__actions", children: [all] }),
    ],
  });
}