import {z} from 'zod'

export type MessageContentPartImageUrl = {detail?: (string | null) | undefined, url: string};

export type MessageContentPart = {text: string, type: string} | {image_url: MessageContentPartImageUrl, type: string};

export type MessageContent = string | Array<MessageContentPart>;

export type ToolCallFunction = {arguments: string, name: string};

export type ToolCall = {function: ToolCallFunction, id: string, type: string};

export type ChatCompletionMessage = {content?: (MessageContent | null) | undefined, name?: (string | null) | undefined, role: 'system'} | {content?: (MessageContent | null) | undefined, name?: (string | null) | undefined, role: 'user'} | {content?: (MessageContent | null) | undefined, name?: (string | null) | undefined, refusal?: (string | null) | undefined, role: 'assistant', tool_calls?: Array<ToolCall> | undefined} | {content?: (MessageContent | null) | undefined, role: 'tool', tool_call_id?: string | undefined};

export type JsonSchemaResponseFormat = {description?: (string | null) | undefined, name: string, schema: unknown, strict?: (boolean | null) | undefined};

export type ResponseFormatType = 'text' | 'json_object' | 'json_schema';

export type ResponseFormat = {json_schema?: (JsonSchemaResponseFormat | null) | undefined, type: ResponseFormatType};

export type StreamOptions = {include_usage?: (boolean | null) | undefined};

export type ToolChoiceLiteral = 'none' | 'auto';

export type ChatCompletionNamedFunction = {name: string};

export type ChatCompletionNamedToolChoiceParam = {function: ChatCompletionNamedFunction, type: string};

export type ToolChoice = ToolChoiceLiteral | ChatCompletionNamedToolChoiceParam;

export type ChatCompletionToolFunctionParam = {description?: (string | null) | undefined, name: string, parameters?: ({[key: string]: unknown} | null) | undefined, strict?: (boolean | null) | undefined};

export type ChatCompletionToolsParam = {function: ChatCompletionToolFunctionParam, type: string};

export type CreateChatCompletionRequest = {frequency_penalty?: (number | null) | undefined, function_call: unknown, functions?: (Array<unknown> | null) | undefined, logit_bias?: ({[key: string]: number} | null) | undefined, max_completion_tokens?: (number | null) | undefined, max_tokens?: (number | null) | undefined, messages: Array<ChatCompletionMessage>, model: string, n?: (number | null) | undefined, parallel_tool_calls?: (boolean | null) | undefined, presence_penalty?: (number | null) | undefined, response_format?: (ResponseFormat | null) | undefined, seed?: (number | null) | undefined, service_tier?: (string | null) | undefined, stop?: (Array<string> | null) | undefined, stream?: (boolean | null) | undefined, stream_options?: (StreamOptions | null) | undefined, temperature?: (number | null) | undefined, tool_choice?: (ToolChoice | null) | undefined, tools?: (Array<ChatCompletionToolsParam> | null) | undefined, top_logprobs?: (number | null) | undefined, top_p?: (number | null) | undefined, user?: (string | null) | undefined};

export type CreateApiV1ChatCompletionsArgs = {body: CreateChatCompletionRequest};

export type CreateApiV1ChatCompletionsOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

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

export const chatCompletionLogProbsContent = z.object({top_logprobs: z.array(chatCompletionLogProb)});

export const chatCompletionLogProbs = z.object({content: z.array(chatCompletionLogProbsContent).nullable().optional()});

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

export const messageContentPart = z.union([z.object({text: z.string(), type: z.string()}), z.object({image_url: messageContentPartImageUrl, type: z.string()})]);

export const messageContent = z.union([z.string(), z.array(messageContentPart)]);

export const toolCallFunction = z.object({arguments: z.string(), name: z.string()});

export const toolCall = z.object({function: toolCallFunction, id: z.string(), type: z.string()});

export const chatCompletionMessage = z.union([z.object({content: messageContent.nullable().optional(), name: z.string().nullable().optional(), role: z.literal("system")}), z.object({content: messageContent.nullable().optional(), name: z.string().nullable().optional(), role: z.literal("user")}), z.object({content: messageContent.nullable().optional(), name: z.string().nullable().optional(), refusal: z.string().nullable().optional(), role: z.literal("assistant"), tool_calls: z.array(toolCall).optional()}), z.object({content: messageContent.nullable().optional(), role: z.literal("tool"), tool_call_id: z.string().optional()})]);

export const chatCompletionChoice = z.object({finish_reason: z.string().nullable().optional(), index: z.number().int(), logprobs: chatCompletionLogProbs.nullable().optional(), message: chatCompletionMessage});

export const promptTokensDetails = z.object({audio_tokens: z.number().int().gte(0), cached_tokens: z.number().int().gte(0)});

export const completionUsage = z.object({completion_tokens: z.number().int(), prompt_tokens: z.number().int(), prompt_tokens_details: promptTokensDetails.nullable().optional(), total_tokens: z.number().int()});

export const chatCompletionResponse = z.object({choices: z.array(chatCompletionChoice), created: z.number().int(), id: z.string(), model: z.string(), object: z.string(), service_tier: z.string().nullable().optional(), system_fingerprint: z.string().nullable().optional(), usage: completionUsage.nullable().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
};

/**
 * Create chat completions
 * 
 * POST /v1/chat/completions
 */
export const createApiV1ChatCompletions = async (args: CreateApiV1ChatCompletionsArgs, options?: CreateApiV1ChatCompletionsOptions) => {
const {baseUrl = "https://api.atoma.network", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/chat/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(chatCompletionResponse, await res.json())
};