import {z} from 'zod'

export type FIMCompletionRequest = {model: string, temperature?: (number | null) | undefined, top_p?: (number | null) | undefined, max_tokens?: (number | null) | undefined, stream?: boolean | undefined, stop?: (string | Array<string> | null) | undefined, random_seed?: (number | null) | undefined, metadata?: ({[key: string]: unknown} | null) | undefined, prompt: string, suffix?: (string | null) | undefined, min_tokens?: (number | null) | undefined, prompt_cache_key?: (string | null) | undefined};

export type CreateApiV1FimCompletionsArgs = {body: FIMCompletionRequest};

export type CreateApiV1FimCompletionsOptions = {baseUrl?: string | undefined, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const usageInfo = z.object({prompt_tokens: z.number().int(), completion_tokens: z.number().int(), total_tokens: z.number().int(), prompt_audio_seconds: z.number().int().nullable().optional(), service_tier: z.string().nullable().optional()});

export const textChunk = z.object({type: z.literal("text").optional(), text: z.string()});

export const imageDetail = z.enum(["low", "auto", "high"]);

export const imageURL = z.object({url: z.string(), detail: imageDetail.nullable().optional()});

export const imageURLChunk = z.object({type: z.literal("image_url").optional(), image_url: z.union([imageURL, z.string()])});

export const documentURLChunk = z.object({type: z.literal("document_url").optional(), document_url: z.string(), document_name: z.string().nullable().optional()});

export const referenceChunk = z.object({type: z.literal("reference").optional(), reference_ids: z.array(z.union([z.number().int(), z.string()]))});

export const fileChunk = z.object({type: z.literal("file").optional(), file_id: z.string()});

export const builtInConnectors = z.enum(["web_search", "web_search_premium", "code_interpreter", "image_generation", "document_library", "mistral_mcp"]);

export const toolReferenceChunk = z.object({type: z.literal("tool_reference").optional(), tool: z.union([builtInConnectors, z.string()]), title: z.string(), url: z.string().nullable().optional(), favicon: z.string().nullable().optional(), description: z.string().nullable().optional()});

export const thinkChunk = z.object({type: z.literal("thinking").optional(), thinking: z.array(z.union([textChunk, toolReferenceChunk, referenceChunk])), signature: z.string().nullable().optional(), closed: z.boolean().optional()});

export const audioChunk = z.object({type: z.literal("input_audio").optional(), input_audio: z.union([z.string(), z.string()])});

export const resourceChunk = z.object({type: z.literal("resource").optional(), uri: z.string(), content: z.discriminatedUnion("type", [textChunk, imageURLChunk])});

export const resourceLinkChunk = z.object({type: z.literal("resource_link").optional(), uri: z.string(), metadata: z.record(z.string(), z.union([z.string(), z.number().int(), z.number(), z.boolean()])).nullable().optional()});

export const contentChunk = z.discriminatedUnion("type", [textChunk, imageURLChunk, documentURLChunk, referenceChunk, fileChunk, thinkChunk, audioChunk, resourceChunk, resourceLinkChunk]);

export const toolTypes = z.literal("function");

export const functionCall = z.object({name: z.string(), arguments: z.union([z.record(z.string(), z.unknown()), z.string()])});

export const toolCall = z.object({id: z.string().optional(), type: toolTypes.optional(), function: functionCall, index: z.number().int().optional()});

export const assistantMessage = z.object({role: z.literal("assistant").optional(), content: z.union([z.string(), z.array(contentChunk)]).nullable().optional(), tool_calls: z.array(toolCall).nullable().optional(), prefix: z.boolean().optional()});

export const deltaMessage = z.object({role: z.string().nullable().optional(), content: z.union([z.string(), z.array(contentChunk)]).nullable().optional(), tool_calls: z.array(toolCall).nullable().optional(), tool_call_id: z.string().nullable().optional(), index: z.number().int().gte(0).nullable().optional(), metadata: z.record(z.string(), z.unknown()).nullable().optional()});

export const chatCompletionResponseTokenLogprobs = z.object({token: z.string(), logprob: z.number(), bytes: z.array(z.number().int()), token_id: z.number().int()});

export const chatCompletionResponseTokenLogprobsTopK = z.object({token: z.string(), logprob: z.number(), bytes: z.array(z.number().int()), token_id: z.number().int(), top_logprobs: z.array(chatCompletionResponseTokenLogprobs).nullable().optional()});

export const chatCompletionResponseChoiceLogprobs = z.object({content: z.array(chatCompletionResponseTokenLogprobsTopK)});

export const chatCompletionChoice = z.object({index: z.number().int(), message: assistantMessage.optional(), messages: z.array(deltaMessage).optional(), finish_reason: z.enum(["stop", "length", "model_length", "error", "tool_calls"]), logprobs: chatCompletionResponseChoiceLogprobs.nullable().optional(), prompt_logprobs: chatCompletionResponseChoiceLogprobs.nullable().optional()});

export const fIMCompletionResponse = z.object({id: z.string(), object: z.string(), model: z.string(), usage: usageInfo, created: z.number().int(), choices: z.array(chatCompletionChoice)});

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
};

/**
 * Fim Completion
 * 
 * POST /v1/fim/completions
 */
export const createApiV1FimCompletions = async (args: CreateApiV1FimCompletionsArgs, options?: CreateApiV1FimCompletionsOptions) => {
const {baseUrl = "https://api.mistral.ai", fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

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

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