import {z} from 'zod'

export type GetApiV1RulesRuleIdArgs = {rule_id: string};

export type GetApiV1RulesRuleIdOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const ruleType = z.enum(["permission", "prohibition", "obligation", "recommendation"]);

export const ruleConstraint = z.object({condition_type: z.string(), field: z.string(), operator: z.string(), value: z.union([z.string(), z.number().int(), z.number(), z.boolean(), z.array(z.string())])});

export const severity = z.enum(["info", "low", "medium", "high", "critical"]);

export const ruleConsequence = z.object({action: z.string().optional(), severity: severity.optional(), message: z.string().nullable().optional()});

export const sourceLocation = z.object({section: z.string().nullable().optional(), paragraph: z.number().int().nullable().optional(), char_start: z.number().int().nullable().optional(), char_end: z.number().int().nullable().optional(), source_text: z.string().nullable().optional()});

export const ruleProvenance = z.object({extracted_by: z.enum(["llm", "manual"]).optional(), model_used: z.string().nullable().optional(), confidence_score: z.number().nullable().optional(), source_location: sourceLocation.nullable().optional()});

export const policyCategory = z.enum(["privacy", "ethics", "security", "compliance", "operational", "brand", "custom"]);

export const ruleStatus = z.enum(["draft", "approved", "rejected", "modified"]);

export const policyRule = z.object({id: z.string(), policy_id: z.string(), rule_id: z.string(), rule_type: ruleType, action: z.string(), target: z.string().nullable().optional(), assignee: z.string().nullable().optional(), constraints: z.union([z.array(ruleConstraint), z.array(z.record(z.string(), z.unknown()))]).optional(), constraint_logic: z.string().optional(), consequence: z.union([ruleConsequence, z.record(z.string(), z.unknown())]), natural_language: z.string(), provenance: z.union([ruleProvenance, z.record(z.string(), z.unknown())]).nullable().optional(), category: policyCategory.nullable().optional(), tags: z.array(z.string()).nullable().optional(), status: ruleStatus.optional(), reviewed_by: z.string().nullable().optional(), reviewed_at: z.number().int().nullable().optional(), review_notes: z.string().nullable().optional(), created_at: z.number().int(), updated_at: z.number().int()});

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 Rule
 * 
 * GET /v1/rules/{rule_id}
 */
export const getApiV1RulesRuleId = async (args: GetApiV1RulesRuleIdArgs, options: GetApiV1RulesRuleIdOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/rules/${encodeURIComponent(String(args.rule_id))}${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(policyRule, await res.json())
};