import { apiFetch } from "@/core/api";
import { getBackendBaseURL } from "@/core/config";

import type {
  HtmlPageFavorite,
  PublishedScheduledTask,
  ScheduledTask,
  ScheduledTaskDeliveryProfile,
  ScheduledTaskExecutionContext,
  ScheduledTaskResultFileContent,
  ScheduledTaskRun,
  ScheduledTaskRunFileUpdateResponse,
  ScheduledTaskRunHtml,
  ScheduledTaskRunMessagesResponse,
  ScheduledTaskSubscription,
  SchedulerThread,
} from "./types";

const baseUrl = () => `${getBackendBaseURL()}/api/scheduled-tasks`;

async function parseResponse<T>(response: Response): Promise<T> {
  if (!response.ok) {
    const error = await response
      .json()
      .catch(() => ({ detail: "Request failed" }));
    throw new Error(error.detail ?? "Request failed");
  }
  return response.json() as Promise<T>;
}

export async function getSchedulerThread() {
  return parseResponse<SchedulerThread>(await apiFetch(`${baseUrl()}/thread`));
}

export interface ListScheduledTasksParams {
  search?: string;
  tagIds?: string[];
}

export async function listScheduledTasks(params: ListScheduledTasksParams = {}) {
  const qs = new URLSearchParams();
  if (params.search) qs.set("search", params.search);
  for (const id of params.tagIds ?? []) qs.append("tag_ids", id);
  const query = qs.toString();
  return parseResponse<ScheduledTask[]>(
    await apiFetch(`${baseUrl()}${query ? `?${query}` : ""}`),
  );
}

export async function createScheduledTask(data: {
  name: string;
  description?: string | null;
  prompt: string;
  schedule: string;
  timezone?: string | null;
  execution_agent_name?: string | null;
  require_markdown?: boolean;
  execution_context?: ScheduledTaskExecutionContext | null;
}) {
  return parseResponse<ScheduledTask>(
    await apiFetch(baseUrl(), {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }),
  );
}

export async function listScheduledTaskRuns(taskId: string) {
  return parseResponse<ScheduledTaskRun[]>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/runs`),
  );
}

export async function getScheduledTaskRun(runId: string) {
  return parseResponse<ScheduledTaskRun>(
    await apiFetch(`${baseUrl()}/runs/${encodeURIComponent(runId)}`),
  );
}

export async function deleteScheduledTaskRun(runId: string) {
  return parseResponse<{ success: boolean }>(
    await apiFetch(`${baseUrl()}/runs/${encodeURIComponent(runId)}`, {
      method: "DELETE",
    }),
  );
}

/** Agent messages for a run's underlying agent run — used to inspect a stuck/running run. */
export async function getScheduledTaskRunMessages(runId: string) {
  return parseResponse<ScheduledTaskRunMessagesResponse>(
    await apiFetch(`${baseUrl()}/runs/${encodeURIComponent(runId)}/messages`),
  );
}

export function scheduledTaskRunDownloadUrl(runId: string) {
  return `${baseUrl()}/runs/${encodeURIComponent(runId)}/download`;
}

export function scheduledTaskRunFileDownloadUrl(runId: string, fileIndex: number) {
  return `${baseUrl()}/runs/${encodeURIComponent(runId)}/files/${fileIndex}/download`;
}

export async function getScheduledTaskRunFileContent(runId: string, fileIndex: number) {
  return parseResponse<ScheduledTaskResultFileContent>(
    await apiFetch(`${baseUrl()}/runs/${encodeURIComponent(runId)}/files/${fileIndex}`),
  );
}

export async function updateScheduledTaskRunFile(
  runId: string,
  fileIndex: number,
  content: string,
) {
  return parseResponse<ScheduledTaskRunFileUpdateResponse>(
    await apiFetch(`${baseUrl()}/runs/${encodeURIComponent(runId)}/files/${fileIndex}`, {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ content }),
    }),
  );
}

function filenameFromContentDisposition(header: string | null): string | null {
  if (!header) return null;
  const star = /filename\*=(?:UTF-8'')?([^;]+)/i.exec(header);
  if (star) {
    const raw = star[1].replace(/["']/g, "").trim();
    try {
      return decodeURIComponent(raw);
    } catch {
      return raw;
    }
  }
  const plain = /filename="?([^";\n]+)"?/i.exec(header);
  return plain ? plain[1].trim() : null;
}

async function downloadResponse(response: Response, fallbackFilename: string) {
  if (!response.ok) {
    const error = await response
      .json()
      .catch(() => ({ detail: "Download failed" }));
    const detail = error.detail;
    if (typeof detail === "string") throw new Error(detail);
    if (
      detail &&
      typeof detail === "object" &&
      "message" in detail &&
      typeof detail.message === "string"
    ) {
      throw new Error(detail.message);
    }
    throw new Error("Download failed");
  }
  const blob = await response.blob();
  const contentType = response.headers.get("Content-Type") ?? blob.type;
  const fallbackByType =
    contentType.includes("application/zip") || contentType.includes("application/x-zip-compressed")
      ? fallbackFilename.replace(/\.[^.]+$/, ".zip")
      : fallbackFilename;
  const filename =
    filenameFromContentDisposition(response.headers.get("Content-Disposition")) ??
    fallbackByType;
  const url = URL.createObjectURL(blob);
  const anchor = document.createElement("a");
  anchor.href = url;
  anchor.download = filename;
  anchor.rel = "noopener";
  document.body.appendChild(anchor);
  anchor.click();
  anchor.remove();
  window.setTimeout(() => URL.revokeObjectURL(url), 30_000);
}

export async function downloadScheduledTaskRun(runId: string) {
  await downloadResponse(
    await apiFetch(scheduledTaskRunDownloadUrl(runId)),
    "scheduled-task-result.zip",
  );
}

export async function downloadScheduledTaskRunFile(runId: string, fileIndex: number) {
  await downloadResponse(
    await apiFetch(scheduledTaskRunFileDownloadUrl(runId, fileIndex)),
    "scheduled-task-file",
  );
}

export async function getScheduledTaskDeliveryProfile() {
  return parseResponse<ScheduledTaskDeliveryProfile>(
    await apiFetch(`${baseUrl()}/delivery-profile`),
  );
}

export async function updateScheduledTaskDeliveryProfile(data: {
  element_user_id?: string | null;
}) {
  return parseResponse<ScheduledTaskDeliveryProfile>(
    await apiFetch(`${baseUrl()}/delivery-profile`, {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }),
  );
}

export async function updateScheduledTask(
  taskId: string,
  data: Partial<{
    name: string;
    description: string | null;
    prompt: string;
    schedule: string;
    timezone: string;
    enabled: boolean;
    execution_agent_name: string | null;
    require_markdown: boolean;
    execution_context: ScheduledTaskExecutionContext | null;
  }>,
) {
  return parseResponse<ScheduledTask>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}`, {
      method: "PATCH",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }),
  );
}

export async function deleteScheduledTask(taskId: string) {
  return parseResponse<{ success: boolean }>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}`, {
      method: "DELETE",
    }),
  );
}

export async function pauseScheduledTask(taskId: string) {
  return parseResponse<ScheduledTask>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/pause`, {
      method: "POST",
    }),
  );
}

export async function resumeScheduledTask(taskId: string) {
  return parseResponse<ScheduledTask>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/resume`, {
      method: "POST",
    }),
  );
}

export async function triggerScheduledTask(taskId: string) {
  return parseResponse<{ success: boolean; task: ScheduledTask }>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/trigger`, {
      method: "POST",
    }),
  );
}

export async function listPublishedScheduledTasks(params: { limit?: number; offset?: number } = {}) {
  const query = new URLSearchParams();
  if (params.limit != null) query.set("limit", String(params.limit));
  if (params.offset != null) query.set("offset", String(params.offset));
  const suffix = query.toString();
  return parseResponse<PublishedScheduledTask[]>(
    await apiFetch(`${baseUrl()}/published${suffix ? `?${suffix}` : ""}`),
  );
}

export async function publishScheduledTask(taskId: string) {
  return parseResponse<ScheduledTask>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/publish`, {
      method: "POST",
    }),
  );
}

export async function unpublishScheduledTask(taskId: string) {
  return parseResponse<ScheduledTask>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/unpublish`, {
      method: "POST",
    }),
  );
}

export async function subscribeScheduledTask(taskId: string, notifyElement: boolean) {
  return parseResponse<ScheduledTaskSubscription>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/subscribe`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ notify_element: notifyElement }),
    }),
  );
}

export async function updateScheduledTaskSubscription(taskId: string, notifyElement: boolean) {
  return parseResponse<ScheduledTaskSubscription>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/subscribe`, {
      method: "PATCH",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ notify_element: notifyElement }),
    }),
  );
}

export async function unsubscribeScheduledTask(taskId: string) {
  return parseResponse<{ success: boolean }>(
    await apiFetch(`${baseUrl()}/${encodeURIComponent(taskId)}/subscribe`, {
      method: "DELETE",
    }),
  );
}

// --- Admin (cross-user management) ---

/** List every scheduled task across all users. Admin-only endpoint. */
export async function listAllScheduledTasks(search?: string) {
  const qs = new URLSearchParams();
  if (search) qs.set("search", search);
  const query = qs.toString();
  return parseResponse<ScheduledTask[]>(
    await apiFetch(`${baseUrl()}/admin/all${query ? `?${query}` : ""}`),
  );
}

/** List runs for any task regardless of owner. Admin-only endpoint. */
export async function adminListScheduledTaskRuns(taskId: string) {
  return parseResponse<ScheduledTaskRun[]>(
    await apiFetch(`${baseUrl()}/admin/${encodeURIComponent(taskId)}/runs`),
  );
}

/** Update any task regardless of owner. Admin-only endpoint. */
export async function adminUpdateScheduledTask(
  taskId: string,
  data: Partial<{
    name: string;
    description: string | null;
    prompt: string;
    schedule: string;
    timezone: string;
    enabled: boolean;
    execution_agent_name: string | null;
    require_markdown: boolean;
  }>,
) {
  return parseResponse<ScheduledTask>(
    await apiFetch(`${baseUrl()}/admin/${encodeURIComponent(taskId)}`, {
      method: "PATCH",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }),
  );
}

/** Delete any task regardless of owner. Admin-only endpoint. */
export async function adminDeleteScheduledTask(taskId: string) {
  return parseResponse<{ success: boolean }>(
    await apiFetch(`${baseUrl()}/admin/${encodeURIComponent(taskId)}`, {
      method: "DELETE",
    }),
  );
}

/** Trigger an immediate run of any task regardless of owner. Admin-only. */
export async function adminTriggerScheduledTask(taskId: string) {
  return parseResponse<{ success: boolean; task: ScheduledTask }>(
    await apiFetch(`${baseUrl()}/admin/${encodeURIComponent(taskId)}/trigger`, {
      method: "POST",
    }),
  );
}

// --- HTML page tasks ---

/** Fetch the generated HTML document for an ``html_page`` run. */
export async function getScheduledTaskRunHtml(runId: string) {
  return parseResponse<ScheduledTaskRunHtml>(
    await apiFetch(`${baseUrl()}/runs/${encodeURIComponent(runId)}/html`),
  );
}

const favoritesUrl = () => `${getBackendBaseURL()}/api/html-page-favorites`;

export async function listHtmlPageFavorites() {
  return parseResponse<HtmlPageFavorite[]>(await apiFetch(favoritesUrl()));
}

export async function getHtmlPageFavorite(favoriteId: string) {
  return parseResponse<HtmlPageFavorite>(
    await apiFetch(`${favoritesUrl()}/${encodeURIComponent(favoriteId)}`),
  );
}

export async function createHtmlPageFavorite(data: {
  page_id: string;
  title?: string | null;
  description?: string | null;
  tags?: string[];
}) {
  return parseResponse<HtmlPageFavorite>(
    await apiFetch(favoritesUrl(), {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }),
  );
}

export async function deleteHtmlPageFavorite(favoriteId: string) {
  return parseResponse<{ success: boolean }>(
    await apiFetch(`${favoritesUrl()}/${encodeURIComponent(favoriteId)}`, {
      method: "DELETE",
    }),
  );
}