import {z} from 'zod'

export type GetApiApiLearningPlansCatalogArgs = {lang?: (string | null) | undefined, include_reflections?: boolean | undefined, include_premium?: boolean | undefined, include_bodies?: boolean | undefined, include_starter_count?: boolean | undefined, catalog_version?: number | undefined, 'x-user-id'?: (string | null) | undefined};

export type GetApiApiLearningPlansCatalogOptions = {baseUrl: string, HTTPBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const devotionalSegment = z.object({type: z.literal("devotional"), title: z.string(), body: z.string().nullable().optional()});

export const scriptureReference = z.object({book: z.string(), chapter: z.number().int(), verses: z.string()});

export const scriptureSegment = z.object({type: z.literal("scripture"), reference: scriptureReference});

export const multipleChoiceQuestion = z.object({format: z.literal("multiple_choice"), prompt: z.string(), choices: z.array(z.string()), correct_index: z.number().int(), explanation: z.string()});

export const trueFalseQuestion = z.object({format: z.literal("true_false"), prompt: z.string(), correct: z.boolean(), explanation: z.string()});

export const reflectionSegment = z.object({type: z.literal("reflection"), questions: z.array(z.union([multipleChoiceQuestion, trueFalseQuestion])), reflection_prompt: z.string()});

export const planDay = z.object({day_index: z.number().int(), segments: z.array(z.union([devotionalSegment, scriptureSegment, reflectionSegment]))});

export const plan = z.object({key: z.string(), title: z.string(), author: z.string(), duration_days: z.number().int(), topic: z.string(), description: z.string(), premium: z.boolean().nullable().optional(), days: z.array(planDay)});

export const learningPlanCatalog = z.object({plans: z.array(plan), starter_count: z.number().int().nullable().optional()});

export const getApiApiLearningPlansCatalogResponse = z.union([z.array(plan), learningPlanCatalog]);

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
};

/**
 * List Catalog
 * 
 * GET /api/learning-plans/catalog
 */
export const getApiApiLearningPlansCatalog = async (args: GetApiApiLearningPlansCatalogArgs, options: GetApiApiLearningPlansCatalogOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

if (args.lang != null) query.append("lang", String(args.lang))
if (args.include_reflections != null) query.append("include_reflections", String(args.include_reflections))
if (args.include_premium != null) query.append("include_premium", String(args.include_premium))
if (args.include_bodies != null) query.append("include_bodies", String(args.include_bodies))
if (args.include_starter_count != null) query.append("include_starter_count", String(args.include_starter_count))
if (args.catalog_version != null) query.append("catalog_version", String(args.catalog_version))
if (args['x-user-id'] != null) headers.set("x-user-id", String(args['x-user-id']))
if (HTTPBearer !== undefined) headers.set('authorization', `Bearer ${HTTPBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/learning-plans/catalog${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

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

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