import {z} from 'zod'

export type GetApiV1GatewayProvidersArgs = {limit?: number | undefined, cursor?: (string | null) | undefined};

export type GetApiV1GatewayProvidersOptions = {baseUrl: string, OAuth2AuthorizationCodeBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const fixedApiKeyProviderRead = z.object({vendor: z.enum(["openai", "anthropic", "doubleword", "google-gla", "groq", "huggingface", "mistral"])});

export const bedrockProviderReadConfig = z.object({api: z.enum(["runtime", "mantle"]), region: z.string().min(3).max(63)});

export const bedrockProviderRead = z.object({vendor: z.literal("bedrock"), config: bedrockProviderReadConfig});

export const azureProviderReadConfig = z.object({endpoint: z.string()});

export const azureProviderRead = z.object({vendor: z.literal("azure"), config: azureProviderReadConfig});

export const googleVertexProviderReadConfig = z.object({endpoint: z.string()});

export const googleVertexProviderRead = z.object({vendor: z.literal("google-vertex"), config: googleVertexProviderReadConfig});

export const gatewayProviderPricingOutput = z.object({required: z.boolean()});

export const gatewayProviderRead = z.object({id: z.string(), slug: z.string(), provider: z.discriminatedUnion("vendor", [fixedApiKeyProviderRead, bedrockProviderRead, azureProviderRead, googleVertexProviderRead]), pricing: gatewayProviderPricingOutput, created_at: z.string()});

export const gatewayProvidersPage = z.object({providers: z.array(gatewayProviderRead), next_cursor: z.string().nullable()});

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 Gateway Providers
 * 
 * GET /v1/gateway/providers/
 */
export const getApiV1GatewayProviders = async (args: GetApiV1GatewayProvidersArgs, options: GetApiV1GatewayProvidersOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2AuthorizationCodeBearer} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (OAuth2AuthorizationCodeBearer !== undefined) headers.set('authorization', `Bearer ${OAuth2AuthorizationCodeBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/gateway/providers/${query.size > 0 ? `?${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(gatewayProvidersPage, await res.json())
};