/* =============================================================================
 * D03_PlanAnalysis_Api.ts
 * D03 분석 화면 서버 요청(PLAN 563-1) — 지형 받기 범위 · 받기 · 진행 ·
 *   사업 전체 지형면 한 벌(`models_plan/` · 격자) · 그은 선 정본(562-2 GET · PUT network · 응답에 D02 시점 · 종점) ·
 *   지도 겹(569 — 지적도 · 도엽 겹 GeoJSON 경위도 · 급경사 그림).
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import { fetchCachedBytes } from "../A00_Common/b_asset_cache";
import { listSurfaceModels } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
import type { GeoJsonCollection } from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
import { type DtmGrid, parseDtmGrid } from "../common_util/common_util_surface_sampler";
import type { PlanLine, PlanPiece, Vertex } from "./logic/D03_PlanAnalysis_Plan";

export interface BasePoint {
  lon: number;
  lat: number;
  x: number;
  y: number;
}

/** D02 정본 — 전체 시점 · 종점(작업 좌표계 m + 경위도). */
export interface PlanBaseView {
  epsg: number | null;
  start: BasePoint | null;
  end: BasePoint | null;
}

export interface PlanJob {
  running: boolean;
  percent: number;
  message: string | null;
  error: string | null;
}

/** 받기 전 범위(561-2) — 상자(작업 좌표계 m · 경위도 네 귀) · 받은 범위 · 도엽 · 칸 수 어림. */
export interface TerrainExtent {
  epsg: number;
  margin_m: number;
  box_m: [number, number, number, number];
  box: Array<[number, number]>;
  have_m: [number, number, number, number] | null;
  have: Array<[number, number]> | null;
  covered: boolean;
  sheets: Array<{ no: string; ring: Array<[number, number]>; stored: boolean }>;
  cells: number;
}

/** 그은 선 서버 꼴(562-2) — 마크 = 조각 경계 · 조각 없는 구역 = 연도 없음. */
export interface ServerNetwork {
  epsg: number;
  lines: PlanLine[];
  marks: Array<{ line: string; at_m: number }>;
  pieces: PlanPiece[];
}

export interface PlanNetworkView {
  /** D02 정본 전체 시점 · 종점. */
  base: PlanBaseView;
  network: ServerNetwork | null;
  derived: {
    lines: Array<{ id: string; length_m: number; stations: number[] }>;
    pieces: Array<PlanPiece & { length_m: number; planned: Vertex[] }>;
  } | null;
  /** 옛 연도 노선을 선으로 바꾼 것인가. */
  legacy: boolean;
  /** 사업연도 시작(있으면). */
  year_start?: number | null;
}

export interface PlanSurface {
  modelId: number;
  grid: DtmGrid;
}

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

const base = (projectId: string): string => `/projects/${projectId}/plan`;

/** 받기 전 범위 — `extra` = 더 덮을 점(그은 꺾임점). */
export const fetchTerrainExtent = (
  projectId: string,
  marginM: number | null,
  extra: Vertex[],
): Promise<TerrainExtent> => {
  const query = new URLSearchParams();
  if (marginM !== null) query.set("margin_m", String(marginM));
  if (extra.length) query.set("extra", JSON.stringify(extra));
  return request(`${base(projectId)}/terrain/extent?${query}`);
};

export const startTerrain = (
  projectId: string,
  marginM: number | null,
  extra: Vertex[],
): Promise<PlanJob> =>
  request(`${base(projectId)}/terrain`, {
    method: "POST",
    body: JSON.stringify({ margin_m: marginM, extra }),
  });

export const fetchPlanProgress = (projectId: string): Promise<{ terrain: PlanJob }> =>
  request(`${base(projectId)}/progress`);

export const fetchPlanNetwork = (projectId: string): Promise<PlanNetworkView> =>
  request(`${base(projectId)}/network`);

export const savePlanNetwork = (
  projectId: string,
  network: ServerNetwork,
): Promise<PlanNetworkView> =>
  request(`${base(projectId)}/network`, { method: "PUT", body: JSON.stringify(network) });

/** 사업 전체 지형면 — 모델 행 경로 `…/models_plan/…` · 격자 = 평활본 · 없으면 null. */
export async function fetchPlanSurface(projectId: string): Promise<PlanSurface | null> {
  const { models } = await listSurfaceModels(projectId);
  const model = models.find((entry) => /models_plan\//.test(entry.model_file_path ?? ""));
  if (!model) return null;
  const stamp = String(model.generation_params?.file_stamp ?? "");
  const url =
    `${API_BASE_URL}/projects/${projectId}/surface/models/${model.id}/grid` +
    `?smooth=true&sig=${encodeURIComponent(stamp)}`;
  return { modelId: model.id, grid: parseDtmGrid(await fetchCachedBytes(projectId, url)) };
}

/** 지도 겹 그림(569-1) — 작업 좌표계 m 상자(칸 가장자리) · data URL(위 = 북) · 단계 색 · 넓이 비율. */
export interface PlanRaster {
  box_m: [number, number, number, number];
  image: string;
  bands: Array<{ min_deg: number; max_deg: number; color: string; ratio: number }>;
}

export const fetchPlanCadastral = (projectId: string): Promise<GeoJsonCollection> =>
  request(`${base(projectId)}/layers/cadastral`);

/** 도엽 겹(`도로중심선` 등) — 없으면 서버가 받은 도엽에서 풀어 냄. */
export const fetchPlanSheetLayer = (projectId: string, key: string): Promise<GeoJsonCollection> =>
  request(`${base(projectId)}/layers/sheet?key=${encodeURIComponent(key)}`);

export const fetchPlanRaster = (projectId: string, kind: "slope"): Promise<PlanRaster> =>
  request(`${base(projectId)}/layers/raster?kind=${kind}`);