export const API_URL = process.env.NEXT_PUBLIC_API_URL ?? "http://127.0.0.1:8000";

export type Subject = { id: number; name: string; slug: string; created_at: string };
export type Week = { id: number; subject_id: number; number: number; title?: string | null; created_at: string };
export type Source = {
  id: number;
  week_id: number;
  original_name: string;
  stored_path: string;
  source_type: string;
  status: string;
  file_size?: number | null;
  sha256?: string | null;
  mime_type?: string | null;
  processor?: string | null;
  page_ranges?: string | null;
  processed_at?: string | null;
  document_id?: number | null;
  document_title?: string | null;
  document_markdown_path?: string | null;
  document_created_at?: string | null;
  created_at: string;
};
export type Job = { id: number; status: string; message: string; source_id?: number | null; document_id?: number | null; created_at: string; updated_at: string };
export type DocumentItem = {
  id: number;
  source_id: number;
  title: string;
  markdown_path: string;
  source_original_name?: string | null;
  source_type?: string | null;
  source_status?: string | null;
  source_processor?: string | null;
  source_page_ranges?: string | null;
  created_at: string;
};
export type SettingsStatus = { mistral_configured: boolean; deepgram_configured: boolean; data_dir: string; database_path: string };

async function parseResponse<T>(response: Response): Promise<T> {
  if (!response.ok) {
    const detail = await response.json().catch(() => null);
    throw new Error(detail?.detail || `Error ${response.status}`);
  }
  return response.json() as Promise<T>;
}

export const api = {
  async health() {
    return parseResponse<{ status: string }>(await fetch(`${API_URL}/health`, { cache: "no-store" }));
  },
  async settings() {
    return parseResponse<SettingsStatus>(await fetch(`${API_URL}/settings/status`, { cache: "no-store" }));
  },
  async subjects() {
    return parseResponse<Subject[]>(await fetch(`${API_URL}/subjects`, { cache: "no-store" }));
  },
  async subject(id: number) {
    return parseResponse<Subject>(await fetch(`${API_URL}/subjects/${id}`, { cache: "no-store" }));
  },
  async createSubject(name: string) {
    return parseResponse<Subject>(await fetch(`${API_URL}/subjects`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ name }),
    }));
  },
  async weeks(subjectId: number) {
    return parseResponse<Week[]>(await fetch(`${API_URL}/subjects/${subjectId}/weeks`, { cache: "no-store" }));
  },
  async week(subjectId: number, weekNumber: number) {
    return parseResponse<Week>(await fetch(`${API_URL}/subjects/${subjectId}/weeks/${weekNumber}`, { cache: "no-store" }));
  },
  async createWeek(subjectId: number, number: number, title: string) {
    return parseResponse<Week>(await fetch(`${API_URL}/subjects/${subjectId}/weeks`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ number, title: title || null }),
    }));
  },
  async updateWeek(subjectId: number, currentNumber: number, number: number, title: string) {
    return parseResponse<Week>(await fetch(`${API_URL}/subjects/${subjectId}/weeks/${currentNumber}`, {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ number, title: title || null }),
    }));
  },
  async sources(subjectId: number, weekNumber: number) {
    return parseResponse<Source[]>(await fetch(`${API_URL}/subjects/${subjectId}/weeks/${weekNumber}/sources`, { cache: "no-store" }));
  },
  async jobs(subjectId: number, weekNumber: number) {
    return parseResponse<Job[]>(await fetch(`${API_URL}/subjects/${subjectId}/weeks/${weekNumber}/jobs`, { cache: "no-store" }));
  },
  async documents(subjectId: number, weekNumber: number) {
    return parseResponse<DocumentItem[]>(await fetch(`${API_URL}/subjects/${subjectId}/weeks/${weekNumber}/documents`, { cache: "no-store" }));
  },
  async deleteSource(sourceId: number) {
    return parseResponse<{ status: string }>(await fetch(`${API_URL}/sources/${sourceId}`, { method: "DELETE" }));
  },
  async deleteDocument(documentId: number) {
    return parseResponse<{ status: string }>(await fetch(`${API_URL}/documents/${documentId}`, { method: "DELETE" }));
  },
  async reprocessSource(sourceId: number, useOcr: boolean, pageRanges?: string) {
    const params = new URLSearchParams({ use_ocr: String(useOcr) });
    if (pageRanges?.trim()) params.set("page_ranges", pageRanges.trim());
    return parseResponse<{ source: Source; job: Job }>(await fetch(`${API_URL}/sources/${sourceId}/reprocess?${params.toString()}`, { method: "POST" }));
  },
  async upload(subjectId: number, weekNumber: number, file: File, useOcr: boolean, pageRanges?: string) {
    const form = new FormData();
    form.append("file", file);
    const params = new URLSearchParams({ use_ocr: String(useOcr) });
    if (pageRanges?.trim()) params.set("page_ranges", pageRanges.trim());
    return parseResponse<{ source: Source; job: Job }>(await fetch(`${API_URL}/subjects/${subjectId}/weeks/${weekNumber}/files?${params.toString()}`, {
      method: "POST",
      body: form,
    }));
  },
  async markdown(documentId: number) {
    const response = await fetch(`${API_URL}/documents/${documentId}/markdown`, { cache: "no-store" });
    if (!response.ok) throw new Error(`Error ${response.status}`);
    return response.text();
  },
  async document(documentId: number) {
    return parseResponse<DocumentItem>(await fetch(`${API_URL}/documents/${documentId}`, { cache: "no-store" }));
  },
  async saveMarkdown(documentId: number, content: string) {
    return parseResponse<DocumentItem>(await fetch(`${API_URL}/documents/${documentId}/markdown`, {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ content }),
    }));
  },
  downloadDocumentUrl(documentId: number) {
    return `${API_URL}/documents/${documentId}/download`;
  },
  exportWeekUrl(subjectId: number, weekNumber: number) {
    return `${API_URL}/subjects/${subjectId}/weeks/${weekNumber}/export`;
  },
  exportWeekZipUrl(subjectId: number, weekNumber: number) {
    return `${API_URL}/subjects/${subjectId}/weeks/${weekNumber}/export.zip`;
  },
};