/** Typed API client for the Virtual Foreman backend. */

import { API_URL } from "./config";

export interface TechStep {
  order: number;
  title: string;
  description: string;
  duration_hours?: number | null;
  required_acts: string[];
  dependencies: number[];
  weather_sensitive: boolean;
}

export interface TechStack {
  source_input: string;
  inferred_summary: string;
  steps: TechStep[];
  required_documents: string[];
  missing_info_prompts: string[];
  model_used: string;
  generated_at: string;
}

export interface InferredWorkResponse {
  tech_stack: TechStack;
  request_id: string;
}

// ----- Blueprint extraction -----

export interface GridAxis {
  label: string;
  order: number;
}

export interface BlueprintDimensions {
  length_m?: number | null;
  width_m?: number | null;
  height_m?: number | null;
  total_area_m2?: number | null;
}

export interface BlueprintSheet {
  sheet_number: string;
  title: string;
  scale?: string | null;
  dimensions?: BlueprintDimensions | null;
  room_labels: string[];
  grid_axes: GridAxis[];
  notes_ru: string[];
}

export interface BlueprintExtraction {
  project_hint: string;
  sheets: BlueprintSheet[];
  inferred_disciplines: string[];
  missing_info_prompts: string[];
  file_name: string;
  file_size_bytes: number;
  mime_type: string;
  model_used: string;
  generated_at: string;
}

export interface BlueprintInferenceResponse {
  extraction: BlueprintExtraction;
  request_id: string;
}

// ----- Projects -----

export interface ProjectPayload {
  contract_no: string;
  object_name: string;
  client: string;
  technical_supervisor: string;
  contractor: string;
  work_producer: string;
  chief_engineer: string;
  start_date?: string;
  end_date_estimated?: string;
}

export interface Project extends ProjectPayload {
  id: string;
  created_at: string;
  persisted?: boolean;
  warning?: string;
}

// ----- Inference history -----

export interface InferenceHistoryRow {
  id: string;
  project_id: string | null;
  request_id: string;
  source_text: string | null;
  payload: unknown;
  model_used: string | null;
  created_at: string;
}

// ----- Document templates -----

export interface DocumentContext {
  [key: string]: unknown;
}

async function postJSON<T>(path: string, body: unknown): Promise<T> {
  const res = await fetch(`${API_URL}${path}`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
  if (!res.ok) {
    const detail = await res.text();
    throw new Error(`API ${path} failed: ${res.status} ${detail}`);
  }
  return (await res.json()) as T;
}

async function getJSON<T>(path: string): Promise<T> {
  const res = await fetch(`${API_URL}${path}`, {
    method: "GET",
    headers: { Accept: "application/json" },
  });
  if (!res.ok) {
    const detail = await res.text();
    throw new Error(`API ${path} failed: ${res.status} ${detail}`);
  }
  return (await res.json()) as T;
}

async function delJSON<T>(path: string): Promise<T> {
  const res = await fetch(`${API_URL}${path}`, {
    method: "DELETE",
    headers: { Accept: "application/json" },
  });
  if (!res.ok) {
    const detail = await res.text();
    throw new Error(`API ${path} failed: ${res.status} ${detail}`);
  }
  return (await res.json()) as T;
}

async function postForm<T>(
  path: string,
  form: FormData,
  opts: { signal?: AbortSignal } = {}
): Promise<T> {
  const res = await fetch(`${API_URL}${path}`, {
    method: "POST",
    body: form,
    signal: opts.signal,
  });
  if (!res.ok) {
    const detail = await res.text();
    throw new Error(`API ${path} failed: ${res.status} ${detail}`);
  }
  return (await res.json()) as T;
}

export async function inferWork(payload: {
  raw_text: string;
  date_from: string;
  date_to: string;
  axes?: string;
  project_id?: string | null;
}): Promise<InferredWorkResponse> {
  return postJSON<InferredWorkResponse>("/work/infer", payload);
}

export async function inferBlueprint(
  file: File,
  project_id?: string | null,
  opts: { signal?: AbortSignal } = {}
): Promise<BlueprintInferenceResponse> {
  const form = new FormData();
  form.append("file", file);
  if (project_id) form.append("project_id", project_id);
  return postForm<BlueprintInferenceResponse>(
    "/work/blueprint",
    form,
    opts
  );
}

export async function createProject(payload: ProjectPayload): Promise<Project> {
  return postJSON<Project>("/projects", payload);
}

export async function listProjects(): Promise<Project[]> {
  return getJSON<Project[]>("/projects");
}

export async function getProject(project_id: string): Promise<Project> {
  return getJSON<Project>(`/projects/${project_id}`);
}

export async function deleteProject(project_id: string): Promise<{ deleted: boolean; id: string }> {
  return delJSON<{ deleted: boolean; id: string }>(`/projects/${project_id}`);
}

export async function listInferenceHistory(project_id?: string): Promise<InferenceHistoryRow[]> {
  const q = project_id ? `?project_id=${encodeURIComponent(project_id)}` : "";
  return getJSON<InferenceHistoryRow[]>(`/inference/history${q}`);
}

/** POST /documents/render — get back a .docx file as Blob. */
export async function renderDocument(
  template_name: string,
  project_id: string,
  context: DocumentContext = {}
): Promise<Blob> {
  const res = await fetch(`${API_URL}/documents/render`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ template_name, project_id, context }),
  });
  if (!res.ok) {
    const detail = await res.text();
    throw new Error(`API /documents/render failed: ${res.status} ${detail}`);
  }
  return res.blob();
}

export async function listDocumentTemplates(): Promise<{ supported: string[] }> {
  return getJSON<{ supported: string[] }>("/documents/templates");
}

// ----- Project documentation (D-light) -----

export interface PageExcerpt {
  page_no: number;
  stamp: string | null;
  title_guess: string | null;
  char_count: number;
  text_preview: string;
}

export interface UploadBlueprintStatus {
  upload_id: string | null;
  file_name: string;
  mime_type: string;
  page_count: number;
  has_native_text: boolean;
  stored_in_supabase: boolean;
  preview_cached: boolean;
  pages: PageExcerpt[];
}

export interface SheetIndexEntry {
  page_no: number;
  stamp: string | null;
  title_guess: string | null;
}

export interface ProjectSummaryTotals {
  sheet_count: number;
  text_pages: number;
  sheets_with_stamp: number;
}

export interface ProjectSummary {
  object_name: string;
  object_address: string | null;
  project_section: string | null;
  totals: ProjectSummaryTotals;
  sheets_index: SheetIndexEntry[];
  spec_summary: string;
  missing_info_prompts: string[];
}

export interface ProjectSummaryResponse {
  upload_id: string;
  model_used: string;
  page_count: number;
  generated_at: string;
  summary: ProjectSummary;
}

export interface PagePreview {
  upload_id: string;
  page_no: number;
  mime: string;
  width: number;
  height: number;
  data_b64: string;
}

/** Phase-1 — ingest a blueprint PDF (or image) and persist all pages. */
export async function uploadBlueprint(
  file: File,
  project_id?: string | null,
  opts: { signal?: AbortSignal } = {}
): Promise<UploadBlueprintStatus> {
  const form = new FormData();
  form.append("file", file);
  if (project_id) form.append("project_id", project_id);
  return postForm<UploadBlueprintStatus>(
    "/uploads/blueprint",
    form,
    opts
  );
}

/** Read the ingest status + per-page record list. */
export async function getBlueprintStatus(
  upload_id: string
): Promise<UploadBlueprintStatus> {
  return getJSON<UploadBlueprintStatus>(
    `/uploads/blueprint/${upload_id}`
  );
}

/** Render page_no of the cached PDF to a PNG (base64). */
export async function getPagePreview(
  upload_id: string,
  page_no: number
): Promise<PagePreview> {
  return getJSON<PagePreview>(
    `/uploads/blueprint/${upload_id}/pages/${page_no}/preview`
  );
}

/** Phase-2 text-only — run the LLM over all extracted pages. */
export async function extractProjectText(
  upload_id: string
): Promise<ProjectSummaryResponse> {
  return postJSON<ProjectSummaryResponse>(
    `/uploads/blueprint/${upload_id}/extract-text`,
    {}
  );
}

/** Phase-2 vision — VLM only on the selected pages. */
export async function extractProjectSheets(
  upload_id: string,
  pages: number[]
): Promise<ProjectSummaryResponse> {
  return postJSON<ProjectSummaryResponse>(
    `/uploads/blueprint/${upload_id}/extract-sheets`,
    { pages }
  );
}

// ===== v2.0 — Project-aware blueprint aggregation =====

export interface UploadRow {
  upload_id: string;
  file_name: string;
  mime_type: string;
  sha256: string;
  page_count: number;
  has_native_text: boolean;
  status: string;
  created_at: string | null;
}

export interface UploadsListResponse {
  project_id: string;
  uploads_count: number;
  uploads: UploadRow[];
  generated_at: string;
}

export interface AggregatedPage {
  upload_id: string;
  upload_file_name: string;
  page_no: number;
  char_count: number;
  stamp: string | null;
  title_guess: string | null;
  is_empty: boolean;
  section_guess: string | null;
  text_preview: string;
}

export interface UploadSummary {
  upload_id: string;
  file_name: string;
  mime_type: string;
  sha256: string;
  page_count: number;
  total_chars: number;
  section_floor: string | null;
  sections: string[];
}

export interface DokumentatsiyaResponse {
  project_id: string;
  aggregate_sha256: string;
  total_uploads: number;
  total_pages: number;
  total_chars: number;
  overall_project_section: string | null;
  upload_summaries: UploadSummary[];
  pages: AggregatedPage[];
  cached_summary: ProjectSummary | null;
  cached_summary_model: string | null;
  generated_at: string;
}

export interface ExtractAllResponse {
  upload_id: string;       // field reuse — UI sees project_id here
  model_used: string;
  page_count: number;
  generated_at: string;
  summary: ProjectSummary;
}

export interface SheetExtractPair {
  upload_id: string | null;
  page_no: number;
}

/** GET /projects/{id}/uploads. */
export async function listProjectUploads(project_id: string): Promise<UploadsListResponse> {
  return getJSON<UploadsListResponse>(`/projects/${project_id}/uploads`);
}

/** GET /projects/{id}/dokumentatsiya. */
export async function projectDokumentatsiya(project_id: string): Promise<DokumentatsiyaResponse> {
  return getJSON<DokumentatsiyaResponse>(`/projects/${project_id}/dokumentatsiya`);
}

/** POST /projects/{id}/extract-all. */
export async function extractProjectAll(
  project_id: string,
  opts: { force?: boolean; max_chars?: number } = {}
): Promise<ExtractAllResponse> {
  const qs = new URLSearchParams();
  if (opts.force) qs.set("force", "true");
  if (typeof opts.max_chars === "number") qs.set("max_chars", String(opts.max_chars));
  const path = `/projects/${project_id}/extract-all${qs.toString() ? `?${qs}` : ""}`;
  return postJSON<ExtractAllResponse>(path, {});
}

/** POST /projects/{id}/extract-sheets. */
export async function extractProjectSheetsV2(
  project_id: string,
  pairs: SheetExtractPair[]
): Promise<ExtractAllResponse> {
  return postJSON<ExtractAllResponse>(
    `/projects/${project_id}/extract-sheets`,
    { pages: pairs }
  );
}

/** POST /uploads/blueprint (project-scoped upload). */
export async function uploadBlueprintV2(
  file: File,
  project_id: string,
  opts: { signal?: AbortSignal } = {}
): Promise<UploadBlueprintStatus> {
  const form = new FormData();
  form.append("file", file);
  form.append("project_id", project_id);
  return postForm<UploadBlueprintStatus>("/uploads/blueprint", form, opts);
}