import {z} from 'zod'

export type GetApiJourneysTemplateIdArgs = {templateId: string, version?: string | undefined};

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

export const journeyState = z.enum(["DRAFT", "PUBLISHED"]);

export const journeyConditionAtom = z.array(z.string());

export const journeyConditionGroup = z.object({AND: z.array(journeyConditionAtom).optional(), OR: z.array(journeyConditionAtom).optional()});

export const journeyConditionNestedGroup = z.object({AND: z.array(journeyConditionGroup).optional(), OR: z.array(journeyConditionGroup).optional()});

export const journeyConditionsField = z.union([journeyConditionAtom, journeyConditionGroup, journeyConditionNestedGroup]);

export const journeyApiInvokeTriggerNode = z.object({id: z.string().min(1).optional(), type: z.literal("trigger"), trigger_type: z.literal("api-invoke"), schema: z.record(z.string(), z.unknown()).optional(), conditions: journeyConditionsField.optional()});

export const journeySegmentTriggerNode = z.object({id: z.string().min(1).optional(), type: z.literal("trigger"), trigger_type: z.literal("segment"), request_type: z.enum(["identify", "group", "track"]), event_id: z.string().min(1).optional(), conditions: journeyConditionsField.optional()});

export const journeyExperimentVariant = z.object({id: z.string().min(1), name: z.string().optional(), weight: z.number().gte(0), templateId: z.string().min(1)});

export const journeyExperiment = z.object({id: z.string().min(1).optional(), name: z.string().optional(), bucketingKey: z.string().min(1), variants: z.array(journeyExperimentVariant)});

export const journeySendNode = z.object({id: z.string().min(1).optional(), type: z.literal("send"), message: z.object({template: z.string().min(1).optional(), to: z.object({email_override: z.string().min(1).optional(), phone_number_override: z.string().min(1).optional(), user_id_override: z.string().min(1).optional()}).optional(), context: z.object({tenant_id: z.string().min(1)}).optional(), delay: z.object({until: z.string().min(1), timezone: z.string().min(1).optional()}).optional(), data: z.record(z.string(), z.unknown()).optional()}), experiment: journeyExperiment.optional(), conditions: journeyConditionsField.optional()});

export const journeyDelayDurationNode = z.object({id: z.string().min(1).optional(), type: z.literal("delay"), mode: z.literal("duration"), duration: z.string().min(1), conditions: journeyConditionsField.optional()});

export const journeyDelayUntilNode = z.object({id: z.string().min(1).optional(), type: z.literal("delay"), mode: z.literal("until"), until: z.string().min(1), conditions: journeyConditionsField.optional()});

export const journeyMergeStrategy = z.enum(["overwrite", "soft-merge", "replace", "none"]);

export const journeyFetchGetDeleteNode = z.object({id: z.string().min(1).optional(), type: z.literal("fetch"), method: z.enum(["get", "delete"]), url: z.string().min(1), merge_strategy: journeyMergeStrategy, headers: z.record(z.string(), z.string()).optional(), query_params: z.record(z.string(), z.string()).optional(), response_schema: z.record(z.string(), z.unknown()).optional(), conditions: journeyConditionsField.optional()});

export const journeyFetchPostPutNode = z.object({id: z.string().min(1).optional(), type: z.literal("fetch"), method: z.enum(["post", "put"]), url: z.string().min(1), merge_strategy: journeyMergeStrategy, headers: z.record(z.string(), z.string()).optional(), query_params: z.record(z.string(), z.string()).optional(), response_schema: z.record(z.string(), z.unknown()).optional(), body: z.string().optional(), conditions: journeyConditionsField.optional()});

export const journeyAINode = z.object({id: z.string().min(1).optional(), type: z.literal("ai"), model: z.string().min(1).optional(), user_prompt: z.string().optional(), web_search: z.boolean().optional(), output_schema: z.record(z.string(), z.unknown()), conditions: journeyConditionsField.optional()});

export const journeyThrottleStaticNode = z.object({id: z.string().min(1).optional(), type: z.literal("throttle"), scope: z.enum(["user", "global"]), max_allowed: z.number().int().gte(1), period: z.string().min(1), conditions: journeyConditionsField.optional()});

export const journeyThrottleDynamicNode = z.object({id: z.string().min(1).optional(), type: z.literal("throttle"), scope: z.literal("dynamic"), max_allowed: z.number().int().gte(1), period: z.string().min(1), throttle_key: z.string().min(1), conditions: journeyConditionsField.optional()});

export const journeyBatchNode = z.object({id: z.string().min(1).optional(), type: z.literal("batch"), scope: z.literal("user"), wait_period: z.string().min(1), max_wait_period: z.string().min(1), max_items: z.number().int().gte(1).lte(1000).optional(), retain: z.object({type: z.enum(["first", "last", "highest", "lowest"]), count: z.number().int().gte(0).lte(25), sort_key: z.string().min(1).optional()}), category_key: z.string().min(1).max(256).optional(), conditions: journeyConditionsField.optional()});

export const journeyAddToDigestNode = z.object({id: z.string().min(1).optional(), type: z.literal("add-to-digest"), subscription_topic_id: z.string().min(1), conditions: journeyConditionsField.optional()});

export const journeyExitNode = z.object({id: z.string().min(1).optional(), type: z.literal("exit")});

export const journeyNode: z.ZodType<JourneyNode> = z.union([journeyApiInvokeTriggerNode, journeySegmentTriggerNode, journeySendNode, journeyDelayDurationNode, journeyDelayUntilNode, journeyFetchGetDeleteNode, journeyFetchPostPutNode, journeyAINode, journeyThrottleStaticNode, journeyThrottleDynamicNode, journeyBatchNode, journeyAddToDigestNode, journeyExitNode, z.object({id: z.string().min(1).optional(), type: z.literal("branch"), paths: z.array(z.object({label: z.string().min(1).optional(), conditions: journeyConditionsField, nodes: z.array(z.lazy(() => journeyNode))})), default: z.object({label: z.string().min(1).optional(), nodes: z.array(z.lazy(() => journeyNode))})})]);

export const journeyResponse = z.object({id: z.string(), name: z.string(), state: journeyState, enabled: z.boolean(), nodes: z.array(journeyNode), created: z.number().int().nullable(), creator: z.string().nullable(), updated: z.number().int().nullable(), updater: z.string().nullable(), published: z.number().int().nullable()});

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
};

/**
 * Fetch a journey by id
 * 
 * GET /journeys/{templateId}
 */
export const getApiJourneysTemplateId = async (args: GetApiJourneysTemplateIdArgs, options?: GetApiJourneysTemplateIdOptions) => {
const {baseUrl = "https://api.courier.com", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args.version != null) query.append("version", String(args.version))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/journeys/${encodeURIComponent(String(args.templateId))}${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(journeyResponse, await res.json())
};