import { Box } from "@mui/material";
import { Plus } from "lucide-react";
import { useState } from "react";
import { Button } from "@/components/ui/button";
import { PageHeader } from "@/components/ui/page-header";
import { QueryErrorPanel } from "@/components/ui/query-error-panel";
import { SearchInput } from "@/components/ui/search-input";
import { Text } from "@/components/ui/text";
import {
  COMPLETION_TEMPLATE_COPY,
  templateCountLabel,
} from "@/domain/completion-templates/constants/completion-template-constants";
import type { CompletionTemplate } from "@/domain/completion-templates/types/completion-template";
import { useCompletionTemplates } from "@/domain/completion-templates/use-cases/use-completion-templates";
import { useDebounce } from "@/hooks/use-debounce";
import { CompletionTemplateDialog } from "./_components/completion-template-dialog";
import { CompletionTemplatesTable } from "./_components/completion-templates-table";
import type { CompletionTemplateDialogMode } from "./_components/use-completion-template-dialog";
import { useCompletionTemplatePermissions } from "./_components/use-completion-template-permissions";

type OpenDialog = { template: CompletionTemplate | null; mode: CompletionTemplateDialogMode };

export default function CompletionDocsPage() {
  const permissions = useCompletionTemplatePermissions();
  const [search, setSearch] = useState("");
  const debouncedSearch = useDebounce(search, 250);
  const all = useCompletionTemplates();
  const filtered = useCompletionTemplates(debouncedSearch);
  const [dialog, setDialog] = useState<OpenDialog | null>(null);
  const templates = filtered.data ?? [];

  return (
    <Box className="flex h-full flex-col overflow-hidden p-2.5">
      <PageHeader
        surface
        title={COMPLETION_TEMPLATE_COPY.pageTitle}
        subtitle={templateCountLabel(all.data?.length ?? 0)}
        actions={
          <div className="flex items-center gap-2">
            <SearchInput
              value={search}
              onChange={setSearch}
              placeholder={COMPLETION_TEMPLATE_COPY.searchPlaceholder}
              aria-label="Search document title"
              className="w-56"
            />
            {permissions.canCreate && (
              <Button
                onClick={() => setDialog({ template: null, mode: "create" })}
                className="gap-1.5"
              >
                <Plus size={13} /> {COMPLETION_TEMPLATE_COPY.addTemplate}
              </Button>
            )}
          </div>
        }
      />

      {filtered.error !== null && (
        <QueryErrorPanel
          className="mt-3 shrink-0"
          compact
          message={filtered.error.message || "Failed to load templates."}
          onRetry={() => void filtered.refetch()}
        />
      )}

      <div
        className="mt-4 min-h-0 flex-1 overflow-auto rounded-lg border border-border"
        style={{ background: "var(--card)" }}
      >
        <CompletionTemplatesTable
          templates={templates}
          isLoading={filtered.isPending}
          hasError={filtered.error !== null}
          canEdit={permissions.canEdit}
          onView={(template) => setDialog({ template, mode: "view" })}
          onEdit={(template) => setDialog({ template, mode: "edit" })}
        />
      </div>
      <div className="shrink-0 px-4 py-2">
        <Text variant="caption" tone="muted" sx={{ fontSize: 11 }}>
          {templateCountLabel(templates.length)}
        </Text>
      </div>

      {dialog !== null && (
        <CompletionTemplateDialog
          key={dialog.template?.id ?? "new"}
          template={dialog.template}
          initialMode={dialog.mode}
          permissions={permissions}
          onClose={() => setDialog(null)}
          onSaved={(template) => setDialog({ template, mode: "view" })}
        />
      )}
    </Box>
  );
}