import { useState } from "react";
import { Link2, X } from "lucide-react";
import { Button, Dialog, i18nMessage } from "@govoplan/core-webui";

import type {
  CampaignAttachmentPreviewFile,
  CampaignAttachmentPreviewResponse
} from "../../../api/campaigns";
import {
  attachmentPreviewLinkableFiles,
  attachmentPreviewMatchedFiles
} from "../utils/attachmentPreview";
import { WorkflowFact } from "./WorkflowNavigation";

export default function AttachmentLinkingPreview({
  preview,
  loading,
  error,
  linking,
  disabled,
  onRefresh,
  onLink
}: {
  preview: CampaignAttachmentPreviewResponse | null;
  loading: boolean;
  error: string;
  linking: boolean;
  disabled: boolean;
  onRefresh: () => void;
  onLink: () => void;
}) {
  const [detailsOpen, setDetailsOpen] = useState(false);
  const matchedFiles = attachmentPreviewMatchedFiles(preview);
  const linkableFiles = attachmentPreviewLinkableFiles(preview);
  const linkedCount =
    preview?.linked_file_count ??
    matchedFiles.filter((file) => file.linked_to_campaign !== false).length;
  const matchedCount = preview?.matched_file_count ?? matchedFiles.length;
  const unlinkedCount = preview?.unlinked_file_count ?? linkableFiles.length;

  return (
    <>
      <div className="review-flow-data-section attachment-linking-preview">
        <div className="attachment-linking-header">
          <div>
            <h3>i18n:govoplan-campaign.attachment_file_links.0be74fd1</h3>
            <p className="muted small-note">
              i18n:govoplan-campaign.preview_includes_already_linked_files_and_access.dfef92af
            </p>
          </div>
          <div className="button-row compact-actions">
            <Button onClick={onRefresh} disabled={loading || linking}>
              {loading
                ? "i18n:govoplan-campaign.refreshing.505dddc9"
                : "i18n:govoplan-campaign.refresh.56e3badc"}
            </Button>
            <Button
              variant="primary"
              onClick={onLink}
              disabled={disabled || loading || linking || unlinkedCount === 0}
            >
              {linking
                ? "i18n:govoplan-campaign.linking.a5f54e0f"
                : i18nMessage(
                    unlinkedCount === 1
                      ? "i18n:govoplan-campaign.link_value_file.4d4ce740"
                      : "i18n:govoplan-campaign.link_value_files.88b7e6a7",
                    { value0: unlinkedCount }
                  )}
            </Button>
          </div>
        </div>
        <div className="review-flow-fact-grid">
          <WorkflowFact
            label="i18n:govoplan-campaign.matched.1bf3ec5b"
            value={
              !loading && matchedFiles.length > 0 ? (
                <button
                  type="button"
                  className="review-flow-fact-detail-button"
                  aria-haspopup="dialog"
                  aria-expanded={detailsOpen}
                  aria-label={i18nMessage(
                    "i18n:govoplan-campaign.view_all_value_matched_attachment_file_links.81e53951",
                    { value0: matchedFiles.length }
                  )}
                  onClick={() => setDetailsOpen(true)}
                >
                  {matchedCount}
                </button>
              ) : loading ? (
                "..."
              ) : (
                matchedCount || "—"
              )
            }
          />
          <WorkflowFact
            label="i18n:govoplan-campaign.linked.a089f600"
            value={loading ? "..." : linkedCount || "—"}
          />
          <WorkflowFact
            label="i18n:govoplan-campaign.need_link.fa4ab530"
            value={loading ? "..." : unlinkedCount || "—"}
          />
          <WorkflowFact
            label="i18n:govoplan-campaign.shared_source.7d4a1bf2"
            value={loading ? "..." : preview?.shared_file_count ?? "—"}
          />
        </div>
        {error && <p className="review-flow-inline-note is-danger">{error}</p>}
        {!error && unlinkedCount > 0 && (
          <p className="review-flow-inline-note is-stale">
            i18n:govoplan-campaign.unlinked_candidate_files_are_not_yet_part_of_the.b8fd5998
          </p>
        )}
        {!error && !loading && matchedFiles.length === 0 && (
          <p className="muted small-note">
            i18n:govoplan-campaign.no_managed_files_matched_the_current_attachment_.dba99f5c
          </p>
        )}
        {matchedFiles.length > 0 && <AttachmentLinkingFileList files={matchedFiles} compact />}
      </div>
      <Dialog
        open={detailsOpen}
        title={i18nMessage(
          "i18n:govoplan-campaign.attachment_file_links_value.ce230e30",
          { value0: matchedFiles.length }
        )}
        className="attachment-linking-detail-modal"
        bodyClassName="attachment-linking-detail-body"
        onClose={() => setDetailsOpen(false)}
        footer={
          <Button variant="primary" onClick={() => setDetailsOpen(false)}>
            i18n:govoplan-campaign.close.bbfa773e
          </Button>
        }
      >
        <p className="muted small-note">
          i18n:govoplan-campaign.all_unique_managed_files_matched_by_the_current_.0214c3e5
        </p>
        <AttachmentLinkingFileList files={matchedFiles} />
      </Dialog>
    </>
  );
}

function AttachmentLinkingFileList({
  files,
  compact = false
}: {
  files: CampaignAttachmentPreviewFile[];
  compact?: boolean;
}) {
  return (
    <ul
      className={`attachment-linking-file-list${compact ? " is-compact" : " is-detail"}`}
      tabIndex={0}
      aria-label={i18nMessage(
        files.length === 1
          ? "i18n:govoplan-campaign.value_matched_attachment_file_link.30a84824"
          : "i18n:govoplan-campaign.value_matched_attachment_file_links.ce509a3a",
        { value0: files.length }
      )}
    >
      {files.map((file, index) => {
        const linked = file.linked_to_campaign !== false;
        const Icon = linked ? Link2 : X;
        return (
          <li
            key={`${file.id || file.display_path || file.filename}:${index}`}
            data-linked={linked ? "true" : "false"}
          >
            <Icon size={15} strokeWidth={2.2} aria-hidden="true" />
            <span>
              <strong>{file.filename || file.display_path}</strong>
              <small>
                {linked
                  ? "i18n:govoplan-campaign.linked_already_part_of_the_campaign_file_snapsho.d037a6bc"
                  : "i18n:govoplan-campaign.unlinked_candidate_match_potentially_missing_unt.2bae9433"}
              </small>
              {file.display_path && file.display_path !== file.filename && (
                <small className="muted">{file.display_path}</small>
              )}
            </span>
          </li>
        );
      })}
    </ul>
  );
}