import {z} from 'zod'

export type GetApiPotsPotIdGraphArgs = {pot_id: string, max_nodes?: number | undefined, include_content?: boolean | undefined};

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

export const graphNode = z.object({id: z.string(), title: z.string().max(80).nullable().optional(), content: z.string().nullable().optional(), pot_score: z.number().gte(0).lte(1), original_pot_score: z.number().nullable().optional(), level: z.string(), node_type: z.string(), document_id: z.string().nullable().optional(), provenance_type: z.string().nullable().optional(), tags: z.array(z.string()).optional(), created_at: z.string().nullable().optional()});

export const graphEdge = z.object({id: z.string(), from_id: z.string(), to_id: z.string(), type: z.string(), weight: z.number().gte(0).lte(1), confidence: z.number().gte(0).lte(1).optional(), rationale: z.string().optional(), created_at: z.string().nullable().optional()});

export const graphDocument = z.object({id: z.string(), filename: z.string(), type: z.string(), facts_count: z.number().int().optional(), created_at: z.string().nullable().optional()});

export const graphStats = z.object({total_nodes: z.number().int().optional(), total_edges: z.number().int().optional(), by_level: z.record(z.string(), z.number().int()).optional(), by_edge_type: z.record(z.string(), z.number().int()).optional(), contradictions_count: z.number().int().optional(), avg_pot_score: z.number().optional(), propagation_applied: z.boolean().optional()});

export const potGraphResponse = z.object({pot_id: z.string(), pot_name: z.string(), nodes: z.array(graphNode), edges: z.array(graphEdge), documents: z.array(graphDocument), stats: graphStats});

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 full POT knowledge graph for visualization
 * 
 * GET /pots/{pot_id}/graph
 */
export const getApiPotsPotIdGraph = async (args: GetApiPotsPotIdGraphArgs, options: GetApiPotsPotIdGraphOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.max_nodes != null) query.append("max_nodes", String(args.max_nodes))
if (args.include_content != null) query.append("include_content", String(args.include_content))

const url = `${baseUrl.replace(/\/+$/, '')}/pots/${encodeURIComponent(String(args.pot_id))}/graph${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(potGraphResponse, await res.json())
};