import {z} from 'zod'

export type FiHookEvent = {hook_event_name: 'UserPromptSubmit' | 'PreToolUse' | 'PostToolUse' | 'Stop', session_id: string, transcript_path: string, cwd?: (string | null) | undefined, permission_mode?: (string | null) | undefined, prompt?: (string | null) | undefined, tool_name?: (string | null) | undefined, tool_input?: ({[key: string]: unknown} | null) | undefined, tool_response: unknown, tool_use_id?: (string | null) | undefined, stop_hook_active?: (boolean | null) | undefined, last_assistant_message?: (string | null) | undefined};

export type CreateApiV4FiHookArgs = {authorization?: (string | null) | undefined, body: FiHookEvent};

export type CreateApiV4FiHookOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const fiHookResponse = z.object({ok: z.boolean(), panels_written: z.number().int().optional(), note: z.string().nullable().optional()});

export const responseMeta = z.object({requestId: z.string().optional(), timestamp: z.string().optional(), durationMs: z.number().int().nullable().optional()});

export const successResponseFiHookResponse = z.object({success: z.literal(true), data: fiHookResponse, meta: responseMeta.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
};

/**
 * Claude Code hook event from a Fi sandbox
 * 
 * POST /v4/fi/hook
 */
export const createApiV4FiHook = async (args: CreateApiV4FiHookArgs, options: CreateApiV4FiHookOptions) => {
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.authorization != null) headers.set("authorization", String(args.authorization))

const url = `${baseUrl.replace(/\/+$/, '')}/v4/fi/hook${query.size > 0 ? `?${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(successResponseFiHookResponse, await res.json())
};