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import { z } from 'https://deno.land/x/zod@v3.19.1/mod.ts'
import { EnvironmentError, InputError, InputErrors } from './errors.ts'import { schemaError, toErrorWithMessage } from './errors.ts'import { isListOfSuccess, formatSchemaErrors, mergeObjects } from './utils.ts'import type { DomainFunction, ErrorData, MergeObjs, Result } from './types.ts'import type { Last, List, ListToResultData } from './types.ts'import type { SuccessResult } from './types.ts'
type MakeDomainFunction = <  Schema extends z.ZodTypeAny,  EnvSchema extends z.ZodTypeAny,>(  inputSchema: Schema,  environmentSchema?: EnvSchema,) => <Output>(  handler: (    inputSchema: z.infer<Schema>,    environmentSchema: z.infer<EnvSchema>,  ) => Promise<Output>,) => DomainFunction<Output>
const makeDomainFunction: MakeDomainFunction =  (    inputSchema: z.ZodTypeAny = z.object({}),    environmentSchema: z.ZodTypeAny = z.object({}),  ) =>  (handler) => {    const domainFunction = (async (input, environment = {}) => {      const envResult = await environmentSchema.safeParseAsync(environment)      const result = await inputSchema.safeParseAsync(input)
      try {        if (result.success === true && envResult.success === true) {          return {            success: true,            data: await handler(result.data, envResult.data),            errors: [],            inputErrors: [],            environmentErrors: [],          }        }      } catch (error) {        if (error instanceof InputError) {          return {            success: false,            errors: [],            environmentErrors: [],            inputErrors: [schemaError(error.message, error.path)],          }        }        if (error instanceof EnvironmentError) {          return {            success: false,            errors: [],            environmentErrors: [schemaError(error.message, error.path)],            inputErrors: [],          }        }        if (error instanceof InputErrors) {          return {            success: false,            errors: [],            environmentErrors: [],            inputErrors: error.errors.map((e) =>              schemaError(e.message, e.path),            ),          }        }        return {          success: false,          errors: [toErrorWithMessage(error)],          inputErrors: [],          environmentErrors: [],        }      }      return {        success: false,        errors: [],        inputErrors: result.success          ? []          : formatSchemaErrors(result.error.issues),        environmentErrors: envResult.success          ? []          : formatSchemaErrors(envResult.error.issues),      }    }) as DomainFunction<Awaited<ReturnType<typeof handler>>>    return domainFunction  }
type All = <Fns extends DomainFunction[]>(  ...fns: Fns) => DomainFunction<List.Map<ListToResultData, Fns>>const all: All = (...fns) => {  return async (input, environment) => {    const results = await Promise.all(      fns.map((fn) => (fn as DomainFunction)(input, environment)),    )
    if (!isListOfSuccess(results)) {      return {        success: false,        errors: results.map(({ errors }) => errors).flat(),        inputErrors: results.map(({ inputErrors }) => inputErrors).flat(),        environmentErrors: results          .map(({ environmentErrors }) => environmentErrors)          .flat(),      }    }
    return {      success: true,      data: results.map(({ data }) => data),      inputErrors: [],      environmentErrors: [],      errors: [],    } as SuccessResult<List.Map<ListToResultData, typeof fns>>  }}
type Merge = <Fns extends DomainFunction[]>(  ...fns: Fns) => DomainFunction<MergeObjs<List.Map<ListToResultData, Fns>>>const merge: Merge = (...fns) => {  return async (input, environment) => {    const results = await Promise.all(      fns.map((fn) => (fn as DomainFunction)(input, environment)),    )
    if (!isListOfSuccess(results)) {      return {        success: false,        errors: results.map(({ errors }) => errors).flat(),        inputErrors: results.map(({ inputErrors }) => inputErrors).flat(),        environmentErrors: results          .map(({ environmentErrors }) => environmentErrors)          .flat(),      }    }
    const collectedResults = results.map(({ data }) => data)
    const resultSchema = z.array(z.object({}))    if (!resultSchema.safeParse(collectedResults).success) {      return {        success: false,        errors: [          { message: 'Invalid data format returned from some domainFunction' },        ],        inputErrors: [],        environmentErrors: [],      }    }
    return {      success: true,      data: mergeObjects(collectedResults),      inputErrors: [],      environmentErrors: [],      errors: [],    } as SuccessResult<MergeObjs<List.Map<ListToResultData, typeof fns>>>  }}
type Pipe = <T extends DomainFunction[]>(...fns: T) => Last<T>const pipe: Pipe = (...fns) => {  const [head, ...tail] = fns
  return ((input: unknown, environment?: unknown) => {    return tail.reduce(async (memo, fn) => {      const resolved = await memo      if (resolved.success) {        return fn(resolved.data as unknown, environment)      } else {        return memo      }    }, head(input, environment))  }) as Last<typeof fns>}
type Sequence = <Fns extends DomainFunction[]>(  ...fns: Fns) => DomainFunction<List.Map<ListToResultData, Fns>>const sequence: Sequence = (...fns) => {  return async function (input: unknown, environment?: unknown) {    const results = []    let currResult: undefined | Result<unknown>    for await (const fn of fns as DomainFunction[]) {      const result = await fn(        currResult?.success ? currResult.data : input,        environment,      )      if (!result.success) return result      currResult = result      results.push(result.data)    }
    return {      success: true,      data: results,      inputErrors: [],      environmentErrors: [],      errors: [],    } as SuccessResult<List.Map<ListToResultData, typeof fns>>  }}
type Map = <O, R>(  dfn: DomainFunction<O>,  mapper: (element: O) => R,) => DomainFunction<R>const map: Map = (dfn, mapper) => {  return async (input, environment) => {    const result = await dfn(input, environment)    if (!result.success) return result
    try {      return {        success: true,        data: mapper(result.data),        errors: [],        inputErrors: [],        environmentErrors: [],      }    } catch (error) {      const errors = [toErrorWithMessage(error)]      return {        success: false,        errors,        inputErrors: [],        environmentErrors: [],      }    }  }}
type MapError = <O>(  dfn: DomainFunction<O>,  mapper: (element: ErrorData) => ErrorData,) => DomainFunction<O>const mapError: MapError = (dfn, mapper) => {  return async (input, environment) => {    const result = await dfn(input, environment)    if (result.success) return result
    try {      return { ...mapper(result), success: false }    } catch (error) {      const errors = [toErrorWithMessage(error)]      return {        success: false,        errors,        inputErrors: [],        environmentErrors: [],      }    }  }}
export { makeDomainFunction, all, pipe, sequence, map, mapError, merge }