import apiClient from './index.js'
import { apiEndpoints as E } from './endpoints.js'
import { paginatedGet } from './paginate.js'
import { apiCall } from './apiError.js'

/**
 * Drop null/undefined keys so an empty UI filter doesn't turn into
 * `?student_id=undefined` over the wire.
 */
const cleanParams = (params) => {
  const out = {}
  for (const [k, v] of Object.entries(params || {})) {
    if (v !== null && v !== undefined) out[k] = v
  }
  return out
}

/* ---------- task CRUD ---------- */

// Get all tasks with optional filters
export const getTasks = (params = {}) => paginatedGet(apiClient, E.TASKS.LIST, cleanParams(params))

// Get task by id
export const getTaskById = (taskId) =>
  apiCall('GET', E.TASKS.DETAIL(taskId), null, 'Failed to fetch task detail')

// Create task (spec 0004: image_* fields removed; new images go through the sub-resource)
export const createTask = (data) => apiCall('POST', E.TASKS.LIST, { data }, 'Failed to create task')

// Update task
export const updateTask = (taskId, data) =>
  apiCall('PATCH', E.TASKS.UPDATE(taskId), { data }, 'Failed to update task')

// Delete task (spec 0004: soft-delete only; image rows are not cascade-soft-deleted)
export const deleteTask = (taskId) =>
  apiCall('DELETE', E.TASKS.DELETE(taskId), null, 'Failed to delete task')

/* ---------- task image sub-resource (spec 0004) ---------- */

/**
 * List every image for a task (paginated; results array is flattened).
 * Each entry: id / mime_type / file_name / key / etag / size_bytes / audit fields.
 */
export const listTaskImages = (taskId, params = {}) =>
  paginatedGet(apiClient, E.TASKS.IMAGES.LIST(taskId), cleanParams(params))

/**
 * Create a task image. Body shape: StdtTaskImagesWrite —
 * required `image_base64`, optional `mime_type` / `file_name`. The backend
 * enforces a soft cap of 20 images per task at POST time.
 */
export const createTaskImage = (taskId, payload) =>
  apiCall('POST', E.TASKS.IMAGES.CREATE(taskId), { data: payload }, 'Failed to create task image')

/**
 * Delete a task image. Soft-delete only — the row stays in the table and the
 * COS object is not removed; a refetch just hides it.
 */
export const deleteTaskImage = (taskId, imageId) =>
  apiCall('DELETE', E.TASKS.IMAGES.DELETE(taskId, imageId), null, 'Failed to delete task image')

/**
 * Fetch a task image's binary content (spec 0004 /content/ endpoint).
 * Must override `responseType: 'blob'` and force a wildcard Accept header;
 * without them DRF's JSON renderer rejects with 406.
 *
 * Returns a Blob.
 */
export const getTaskImageContent = (taskId, imageId) =>
  apiCall(
    'GET',
    E.TASKS.IMAGES.CONTENT(taskId, imageId),
    { config: { responseType: 'blob', headers: { Accept: '*/*' } } },
    'Failed to fetch task image content',
  )