import {z} from 'zod'

export type GetApiRulesArgs = {prefix?: string | undefined, tags?: Array<string> | undefined, summary?: boolean | undefined, staticDataOnly?: boolean | undefined};

export type GetApiRulesOptions = {baseUrl: string, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const triggerDTO = z.object({id: z.string().optional(), label: z.string().optional(), description: z.string().optional(), configuration: z.record(z.string(), z.object({})).optional(), type: z.string().optional()});

export const conditionDTO = z.object({id: z.string().optional(), label: z.string().optional(), description: z.string().optional(), configuration: z.record(z.string(), z.object({})).optional(), type: z.string().optional(), inputs: z.record(z.string(), z.string()).optional()});

export const actionDTO = z.object({id: z.string().optional(), label: z.string().optional(), description: z.string().optional(), configuration: z.record(z.string(), z.object({})).optional(), type: z.string().optional(), inputs: z.record(z.string(), z.string()).optional()});

export const parameterOptionDTO = z.object({label: z.string().optional(), value: z.string().optional()});

export const filterCriteriaDTO = z.object({value: z.string().optional(), name: z.string().optional()});

export const configDescriptionParameterDTO = z.object({context: z.string().optional(), defaultValue: z.string().optional(), description: z.string().optional(), label: z.string().optional(), name: z.string().optional(), required: z.boolean().optional(), type: z.enum(["TEXT", "INTEGER", "DECIMAL", "BOOLEAN"]).optional(), min: z.number().optional(), max: z.number().optional(), stepsize: z.number().optional(), pattern: z.string().optional(), readOnly: z.boolean().optional(), multiple: z.boolean().optional(), multipleLimit: z.number().int().optional(), groupName: z.string().optional(), advanced: z.boolean().optional(), verify: z.boolean().optional(), limitToOptions: z.boolean().optional(), unit: z.string().optional(), unitLabel: z.string().optional(), options: z.array(parameterOptionDTO).optional(), filterCriteria: z.array(filterCriteriaDTO).optional()});

export const ruleStatusInfo = z.object({status: z.enum(["UNINITIALIZED", "INITIALIZING", "IDLE", "RUNNING"]).optional(), statusDetail: z.enum(["NONE", "HANDLER_MISSING_ERROR", "HANDLER_INITIALIZING_ERROR", "CONFIGURATION_ERROR", "TEMPLATE_MISSING_ERROR", "INVALID_RULE", "DISABLED"]).optional(), description: z.string().optional()});

export const enrichedRuleDTO = z.object({triggers: z.array(triggerDTO).optional(), conditions: z.array(conditionDTO).optional(), actions: z.array(actionDTO).optional(), configuration: z.record(z.string(), z.object({})).optional(), configDescriptions: z.array(configDescriptionParameterDTO).optional(), templateUID: z.string().optional(), uid: z.string().optional(), name: z.string().optional(), tags: z.array(z.string()).optional(), visibility: z.enum(["VISIBLE", "HIDDEN", "EXPERT"]).optional(), description: z.string().optional(), status: ruleStatusInfo.optional(), editable: z.boolean().optional()});

export const getApiRulesResponse = z.array(enrichedRuleDTO);

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 available rules, optionally filtered by tags and/or prefix.
 * 
 * GET /rules
 */
export const getApiRules = async (args: GetApiRulesArgs, options: GetApiRulesOptions) => {
const {baseUrl, fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (args.prefix != null) query.append("prefix", String(args.prefix))
for (const item of args.tags ?? []) query.append("tags", String(item))
if (args.summary != null) query.append("summary", String(args.summary))
if (args.staticDataOnly != null) query.append("staticDataOnly", String(args.staticDataOnly))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

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