import {z} from 'zod'

export type GetApiApiV1GraphArgs = {space_uuid?: string | undefined, space_id?: string | undefined, limit?: number | undefined, offset?: (number | null) | undefined};

export type GetApiApiV1GraphOptions = {baseUrl: string, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const graphNode = z.object({id: z.string(), name: z.string(), entity_type: z.string().nullable(), edge_count: z.number().int(), created_at: z.string().nullable(), updated_at: z.string().nullable()});

export const graphEdge = z.object({id: z.string(), source_entity_id: z.string(), target_entity_id: z.string(), relation_type: z.string(), confidence: z.number(), valid_from: z.string().nullable(), recorded_at: z.string()});

export const graphViewportResponse = z.object({nodes: z.array(graphNode), edges: z.array(graphEdge), total_nodes: z.number().int().gte(0), total_edges: z.number().int().gte(0)});

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
};

/**
 * Get graph viewport
 * 
 * GET /api/v1/graph
 */
export const getApiApiV1Graph = async (args: GetApiApiV1GraphArgs, options: GetApiApiV1GraphOptions) => {
const {baseUrl, fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.space_uuid != null) query.append("space_uuid", String(args.space_uuid))
if (args.space_id != null) query.append("space_id", String(args.space_id))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.offset != null) query.append("offset", String(args.offset))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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