import {z} from 'zod'

export type CourseBlockCreate = {type: 'paragraph' | 'theorem' | 'definition' | 'example' | 'property' | 'explanation' | 'note' | 'demonstration' | 'illustration' | 'video' | 'interactive', content: string, after_block_id: string | null};

export type CreateApiTeacherCoursesCourseIdUnitsUnitIdBlocksArgs = {course_id: string, unit_id: string, body: CourseBlockCreate};

export type CreateApiTeacherCoursesCourseIdUnitsUnitIdBlocksOptions = {baseUrl: string, OAuth2PasswordBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const courseBlockResponse = z.object({id: z.string(), type: z.enum(["paragraph", "theorem", "definition", "example", "property", "explanation", "note", "demonstration", "illustration", "video", "interactive"]), content: z.string()});

export const courseUnitBlocksResponse = z.object({unit_id: z.string(), blocks: z.array(courseBlockResponse), generated_content: z.string()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Create Course Block
 * 
 * POST /teacher/courses/{course_id}/units/{unit_id}/blocks
 */
export const createApiTeacherCoursesCourseIdUnitsUnitIdBlocks = async (args: CreateApiTeacherCoursesCourseIdUnitsUnitIdBlocksArgs, options: CreateApiTeacherCoursesCourseIdUnitsUnitIdBlocksOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2PasswordBearer} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (OAuth2PasswordBearer !== undefined) headers.set('authorization', `Bearer ${OAuth2PasswordBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/teacher/courses/${encodeURIComponent(String(args.course_id))}/units/${encodeURIComponent(String(args.unit_id))}/blocks${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(courseUnitBlocksResponse, await res.json())
};