"use client"

import { Button } from "@conusai-kit/ui/primitives"

// Adds a version: the browser stores the file through the files module, then asks this module to append
// it over the revision the page read. A version nobody else has overtaken lands; a stale one is refused.

import type { ProjectSlugs } from "@conusai-kit/ui"
import { describeError, useUpload, useWrite } from "@conusai-kit/ui/data"
import { serviceNotice, usePageNavigation } from "@conusai-kit/ui/patterns"
import { Alert, AlertDescription, Field, FieldLabel, Input } from "@conusai-kit/ui/primitives"
import { type FormEvent, type ReactElement, useState } from "react"

export interface VersionFormLabels {
  readonly heading: string
  readonly file: string
  readonly submit: string
  readonly busy: string
  readonly failed: string
  /** The text of each business refusal by problem code (`businessRefusalNotices` of `@conusai-kit/business/refusals`). */
  readonly refusals: Readonly<Record<string, string>>
}

export function VersionForm({
  slugs,
  documentId,
  revision,
  labels,
}: {
  slugs: ProjectSlugs
  documentId: string
  revision: string
  labels: VersionFormLabels
}): ReactElement {
  const navigation = usePageNavigation()
  const upload = useUpload()
  const add = useWrite<Record<string, unknown>, unknown>("archive.version.add")
  const [requestId, setRequestId] = useState(() => crypto.randomUUID())
  const [state, setState] = useState<{ kind: "idle" | "busy" } | { kind: "failed"; detail: string }>({ kind: "idle" })

  const submit = async (event: FormEvent<HTMLFormElement>): Promise<void> => {
    event.preventDefault()
    const file = new FormData(event.currentTarget).get("file")
    if (!(file instanceof File) || file.size === 0) return
    setState({ kind: "busy" })
    try {
      const stored = await upload(slugs, file)
      await add.mutate({ ...slugs, documentId, revision, fileId: stored.fileId, requestId })
      await navigation.refresh()
      setRequestId(crypto.randomUUID())
      setState({ kind: "idle" })
    } catch (error) {
      setState({ kind: "failed", detail: serviceNotice(error, labels.refusals)?.text ?? describeError(error) })
    }
  }

  return (
    <form key={requestId} onSubmit={submit} aria-busy={state.kind === "busy"}>
      <h2>{labels.heading}</h2>
      <Field>
        <FieldLabel>{labels.file}</FieldLabel>
        <Input name="file" type="file" required />
      </Field>
      <Button type="submit" disabled={state.kind === "busy"}>
        {state.kind === "busy" ? labels.busy : labels.submit}
      </Button>
      {state.kind === "failed" ? (
        <Alert variant="destructive">
          <AlertDescription>{labels.failed.replace("{detail}", state.detail)}</AlertDescription>
        </Alert>
      ) : null}
    </form>
  )
}