import {z} from 'zod'

export type RuleCondition = {field: string, op: string, value: unknown};

export type RuleConditionGroup = {op?: string | undefined, conditions: Array<RuleCondition>};

export type RuleAction = {op: string, value: unknown};

export type RulePreviewRequest = {conditions_op?: string | undefined, conditions: Array<RuleConditionGroup | RuleCondition>, actions?: Array<RuleAction> | undefined, is_active?: boolean | undefined, apply_to_existing?: boolean | undefined, overwrite_existing_categories?: boolean | undefined, limit?: number | undefined, offset?: number | undefined};

export type CreateApiApiRulesPreviewArgs = {'X-Workspace-Id'?: (string | null) | undefined, body: RulePreviewRequest};

export type CreateApiApiRulesPreviewOptions = {baseUrl: string, OAuth2PasswordBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const rulePreviewItem = z.object({id: z.string(), date: z.string(), description: z.string(), amount: z.number(), currency: z.string(), type: z.string(), current_category_id: z.string().nullable().optional(), current_category_name: z.string().nullable().optional(), new_category_id: z.string().nullable().optional(), new_category_name: z.string().nullable().optional(), will_change: z.boolean()});

export const rulePreviewResponse = z.object({matched: z.number().int(), will_change: z.number().int(), will_apply: z.boolean(), sample: z.array(rulePreviewItem), offset: z.number().int().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
};

/**
 * Preview Rule
 * 
 * POST /api/rules/preview
 */
export const createApiApiRulesPreview = async (args: CreateApiApiRulesPreviewArgs, options: CreateApiApiRulesPreviewOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2PasswordBearer} = options ?? {}

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

if (args['X-Workspace-Id'] != null) headers.set("X-Workspace-Id", String(args['X-Workspace-Id']))
if (OAuth2PasswordBearer !== undefined) headers.set('authorization', `Bearer ${OAuth2PasswordBearer}`)

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