import { authFetch } from "./client";
import { invalidateApiCache } from "./cache";

export interface TimeEntryProjectDetails {
  id: string;
  name: string;
  is_deleted: boolean;
  client_name: string | null;
}

export interface TimeEntryTagDetails {
  id: string;
  name: string;
  color: string;
  is_deleted: boolean;
}

export interface TimeEntry {
  id: string;
  workspace: string;
  user: string;
  project: string | null;
  project_details: TimeEntryProjectDetails | null;
  description: string;
  start_time: string;
  start_time_ms: number;
  end_time: string | null;
  end_time_ms: number | null;
  server_now_ms: number;
  duration: string | null;
  tags: string[];
  tag_details: TimeEntryTagDetails[];
  is_billable: boolean;
  hourly_rate: string | null;
  currency: string;
  created_at: string;
  updated_at: string;
}

export interface TimeEntryGroupDay {
  key: string;
  date: string;
  total_ms: number;
  entries: TimeEntry[];
}

export interface TimeEntryGroupWeek {
  key: string;
  week_start: string;
  week_end: string;
  total_ms: number;
  days: TimeEntryGroupDay[];
}

interface GroupedTimeEntryResponse {
  items_per_page: number;
  current_page_items_count: number;
  total_items: number;
  offset: number;
  next_offset: number | null;
  has_more: boolean;
  server_now_ms: number;
  server_now: string;
  groups: TimeEntryGroupWeek[];
}

export interface TimeEntryPayload {
  workspace_id?: string;
  project_id?: string | null;
  description?: string;
  start_time?: string;
  end_time?: string | null;
  tags?: string[];
  is_billable?: boolean;
}

export interface TimeEntryListParams {
  limit?: number;
  offset?: number;
  search?: string;
  status?: "running" | "ended" | "all";
  project?: string;
  client?: string;
  tags?: string[];
  started_after?: string;
  started_before?: string;
}

export const getTimeEntries = async (
  workspaceId: string,
  params: TimeEntryListParams = {},
): Promise<GroupedTimeEntryResponse> => {
  const query = new URLSearchParams({ workspace: workspaceId });

  if (params.limit !== undefined) query.append("limit", String(params.limit));
  if (params.offset !== undefined) query.append("offset", String(params.offset));
  if (params.search) query.append("search", params.search);
  if (params.status) query.append("status", params.status);
  if (params.project) query.append("project", params.project);
  if (params.client) query.append("client", params.client);
  if (params.started_after) query.append("started_after", params.started_after);
  if (params.started_before) query.append("started_before", params.started_before);
  if (params.tags?.length) {
    params.tags.forEach((tagId) => query.append("tags", tagId));
  }

  const response = await authFetch(`/api/time-entries/?${query.toString()}`);
  if (!response.ok) throw new Error("Failed to fetch time entries");
  return response.json();
};

export const createTimeEntry = async (payload: TimeEntryPayload) => {
  const response = await authFetch("/api/time-entries/", {
    method: "POST",
    body: JSON.stringify(payload),
  });
  if (!response.ok) throw new Error("Failed to create time entry");
  const data = await response.json();
  invalidateApiCache(["reports"]);
  return data;
};

export const updateTimeEntry = async (id: string, payload: TimeEntryPayload) => {
  const response = await authFetch(`/api/time-entries/${id}/`, {
    method: "PATCH",
    body: JSON.stringify(payload),
  });
  if (!response.ok) throw new Error("Failed to update time entry");
  const data = await response.json();
  invalidateApiCache(["reports"]);
  return data;
};

export const stopTimeEntry = async (id: string, endTime?: string) => {
  const response = await authFetch(`/api/time-entries/${id}/stop/`, {
    method: "POST",
    body: JSON.stringify(endTime ? { end_time: endTime } : {}),
  });
  if (!response.ok) throw new Error("Failed to stop time entry");
  const data = await response.json();
  invalidateApiCache(["reports"]);
  return data;
};

export const deleteTimeEntry = async (id: string) => {
  const response = await authFetch(`/api/time-entries/${id}/`, {
    method: "DELETE",
  });
  if (!response.ok) throw new Error("Failed to delete time entry");
  invalidateApiCache(["reports"]);
};