import {z} from 'zod'

export type TextContentPart = {type: 'text', text: string};

export type FileInputMimeType = 'image/png' | 'image/jpeg' | 'image/gif' | 'image/webp' | 'application/pdf' | 'text/plain';

export type Base64FileSource = {type: 'base64', filename: string, media_type: FileInputMimeType, data: string};

export type FileIdSource = {type: 'file_id', file_id: string};

export type FileContentPart = {type: 'file', source: Base64FileSource | FileIdSource};

export type UserMessageInputItem = {type: 'user_message', content: Array<TextContentPart | FileContentPart>};

export type ClientToolResultItem = {type: 'client_tool_result', tool_call_id: string, result: string, is_error: boolean, error_type?: ('user_rejected' | 'external_server' | 'external_client' | 'customer_auth' | 'client_timeout' | 'unknown' | null) | undefined};

export type ContextualUpdatePlacement = 'in_place' | 'end';

export type ContextualUpdateInputItem = {type: 'contextual_update', text: string, context_id: string, placement?: ContextualUpdatePlacement | undefined};

export type SendConversationMessageStreamRequest = {input: Array<UserMessageInputItem | ClientToolResultItem | ContextualUpdateInputItem>};

export type CreateApiV1ConvaiConversationsConversationIdMessagesStreamArgs = {conversation_id: string, 'xi-api-key'?: (string | null) | undefined, body: SendConversationMessageStreamRequest};

export type CreateApiV1ConvaiConversationsConversationIdMessagesStreamOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const agentOutputStatus = z.enum(["in_progress", "completed", "requires_action", "failed", "timed_out"]);

export const agentOutputError = z.object({type: z.string(), code: z.string(), message: z.string()});

export const clientToolCallRequiredAction = z.object({type: z.literal("client_tool_call").optional(), tool_call_id: z.string(), tool_name: z.string(), parameters: z.record(z.string(), z.unknown())});

export const streamEndedData = z.object({status: agentOutputStatus, error: agentOutputError.nullable().optional(), required_actions: z.array(clientToolCallRequiredAction).optional()});

export const streamEndedEvent = z.object({type: z.literal("stream_ended").optional(), stream_ended_event: streamEndedData});

export const agentChatResponsePartType = z.enum(["start", "delta", "stop"]);

export const agentChatResponsePartClientEventData = z.object({text: z.string(), type: agentChatResponsePartType, event_id: z.number().int(), response_id: z.string()});

export const agentChatResponsePartClientEvent = z.object({text_response_part: agentChatResponsePartClientEventData, type: z.literal("agent_chat_response_part").optional()});

export const agentReasoningResponsePartClientEventData = z.object({text: z.string(), type: agentChatResponsePartType, event_id: z.number().int()});

export const agentReasoningResponsePartClientEvent = z.object({reasoning_response_part: agentReasoningResponsePartClientEventData, type: z.literal("agent_reasoning_response_part").optional()});

export const agentResponseType = z.enum(["text", "voice"]);

export const agentResponseAttachment = z.object({url: z.string(), name: z.string(), mime_type: z.string().nullable().optional()});

export const agentResponseClientEventData = z.object({agent_response: z.string(), event_id: z.number().int(), response_id: z.string(), in_response_to_ids: z.array(z.string()).optional(), response_type: agentResponseType.optional(), attachments: z.array(agentResponseAttachment).optional()});

export const agentResponseClientEvent = z.object({agent_response_event: agentResponseClientEventData, type: z.literal("agent_response").optional()});

export const agentToolRequestClientEventData = z.object({tool_name: z.string(), tool_call_id: z.string(), tool_type: z.string(), event_id: z.number().int(), expects_response: z.boolean(), disable_interruptions: z.boolean(), response_timeout_secs: z.number().int(), execution_mode: z.string()});

export const agentToolRequestStreamedEvent = z.object({agent_tool_request: agentToolRequestClientEventData, type: z.literal("agent_tool_request").optional()});

export const agentToolResponseStatus = z.enum(["success", "error", "blocked", "skipped"]);

export const agentToolResponseClientEventData = z.object({tool_name: z.string(), tool_call_id: z.string(), tool_type: z.string(), is_error: z.boolean(), is_blocked: z.boolean().optional(), event_id: z.number().int(), is_called: z.boolean(), status: agentToolResponseStatus});

export const agentToolResponseStreamedEvent = z.object({agent_tool_response: agentToolResponseClientEventData, type: z.literal("agent_tool_response").optional()});

export const clientToolCallClientEventData = z.object({tool_name: z.string(), tool_call_id: z.string(), parameters: z.record(z.string(), z.unknown()), event_id: z.number().int(), expects_response: z.boolean()});

export const clientToolCallEvent = z.object({type: z.literal("client_tool_call").optional(), client_tool_call: clientToolCallClientEventData});

export const streamEnvelope = z.object({conversation_id: z.string(), turn_id: z.string(), created_at_unix_ms: z.number().int(), event: z.discriminatedUnion("type", [streamEndedEvent, agentChatResponsePartClientEvent, agentReasoningResponsePartClientEvent, agentResponseClientEvent, agentToolRequestStreamedEvent, agentToolResponseStreamedEvent, clientToolCallEvent])});

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
};

/**
 * Send Conversation Message Stream
 * 
 * POST /v1/convai/conversations/{conversation_id}/messages/stream
 */
export const createApiV1ConvaiConversationsConversationIdMessagesStream = async (args: CreateApiV1ConvaiConversationsConversationIdMessagesStreamArgs, options: CreateApiV1ConvaiConversationsConversationIdMessagesStreamOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args['xi-api-key'] != null) headers.set("xi-api-key", String(args['xi-api-key']))

const url = `${baseUrl.replace(/\/+$/, '')}/v1/convai/conversations/${encodeURIComponent(String(args.conversation_id))}/messages/stream${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(streamEnvelope, await res.json())
};