import {z} from 'zod'

export type GetApiModelsOptions = {baseUrl?: string | undefined, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const modelCapabilities = z.object({completion_chat: z.boolean().optional(), function_calling: z.boolean().optional(), vision: z.boolean().optional(), fine_tuning: z.boolean().optional(), completion_fim: z.boolean().optional()});

export const baseModelCard = z.object({capabilities: modelCapabilities, aliases: z.array(z.string()).optional(), max_context_length: z.number().int().optional(), created: z.number().int().optional(), name: z.string().nullable().optional(), default_model_temperature: z.number().nullable().optional(), description: z.string().nullable().optional(), owned_by: z.string().optional(), id: z.string(), deprecation: z.string().nullable().optional(), type: z.literal("base").optional(), object: z.string().optional()});

export const fTModelCard = z.object({capabilities: modelCapabilities, aliases: z.array(z.string()).optional(), created: z.number().int().optional(), description: z.string().nullable().optional(), owned_by: z.string().optional(), deprecation: z.string().nullable().optional(), type: z.literal("fine-tuned").optional(), archived: z.boolean().optional(), max_context_length: z.number().int().optional(), root: z.string(), name: z.string().nullable().optional(), default_model_temperature: z.number().nullable().optional(), id: z.string(), job: z.string(), object: z.string().optional()});

export const modelList = z.object({data: z.array(z.discriminatedUnion("type", [baseModelCard, fTModelCard])).optional(), object: z.string().optional()});

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 Models
 * 
 * GET /models
 */
export const getApiModels = async (options?: GetApiModelsOptions) => {
const {baseUrl = "https://api.mistral.ai/v1", fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

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

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