import { Table, TableBody, TableCell, TableHead, TableRow } from "@mui/material";
import { Eye, FileText, Pencil, Search } from "lucide-react";
import type { MouseEvent } from "react";
import { TableLoadingRow } from "@/components/ui/table-state-rows";
import { Text } from "@/components/ui/text";
import { COMPLETION_TEMPLATE_COPY } from "@/domain/completion-templates/constants/completion-template-constants";
import type { CompletionTemplate } from "@/domain/completion-templates/types/completion-template";
import { formatTemplateDate } from "@/domain/completion-templates/utils/format-template-date";
import { CompletionTemplateCreatedBy } from "./completion-template-created-by";

const HEAD_CELL_SX = {
  fontSize: 10.5,
  fontWeight: 700,
  letterSpacing: "0.06em",
  textTransform: "uppercase",
  background: "var(--color-bg-muted)",
  padding: "11px 14px",
  whiteSpace: "nowrap",
} as const;

const BODY_CELL_SX = { fontSize: 13, padding: "8px 12px" } as const;

type CompletionTemplatesTableProps = {
  templates: CompletionTemplate[];
  isLoading: boolean;
  /** The load failed: the page shows the error, so there is no search result to explain. */
  hasError: boolean;
  canEdit: boolean;
  onView: (template: CompletionTemplate) => void;
  onEdit: (template: CompletionTemplate) => void;
};

function RowAction({
  label,
  icon: Icon,
  onClick,
}: {
  label: string;
  icon: typeof Eye;
  onClick: () => void;
}) {
  return (
    <button
      type="button"
      title={label}
      aria-label={label}
      onClick={(event: MouseEvent) => {
        event.stopPropagation();
        onClick();
      }}
      className="flex size-7 items-center justify-center rounded-md text-muted-foreground transition-colors hover:bg-muted hover:text-primary"
    >
      <Icon size={15} />
    </button>
  );
}

function EmptyRow() {
  return (
    <TableRow>
      <TableCell colSpan={4} sx={{ padding: 0, borderBottom: 0 }}>
        <div
          className="flex flex-col items-center justify-center gap-2 text-center"
          style={{ padding: "64px 16px" }}
        >
          <Search size={22} aria-hidden style={{ color: "var(--color-text-muted)" }} />
          <Text variant="body" sx={{ fontSize: 14, fontWeight: 600 }}>
            {COMPLETION_TEMPLATE_COPY.emptySearchTitle}
          </Text>
          <Text variant="description" tone="muted" sx={{ fontSize: 12.5 }}>
            {COMPLETION_TEMPLATE_COPY.emptySearchHint}
          </Text>
        </div>
      </TableCell>
    </TableRow>
  );
}

function TemplateRow({
  template,
  canEdit,
  onView,
  onEdit,
}: Omit<CompletionTemplatesTableProps, "templates" | "isLoading" | "hasError"> & {
  template: CompletionTemplate;
}) {
  return (
    <TableRow hover onClick={() => onView(template)} sx={{ cursor: "pointer", height: 52 }}>
      <TableCell sx={BODY_CELL_SX}>
        <span className="inline-flex items-center gap-2.5">
          <span
            aria-hidden
            className="inline-flex shrink-0 items-center justify-center rounded-full"
            style={{
              width: 28,
              height: 28,
              background: "var(--color-bg-muted)",
              color: "var(--color-primary)",
            }}
          >
            <FileText size={14} />
          </span>
          {template.name}
        </span>
      </TableCell>
      <TableCell sx={{ ...BODY_CELL_SX, color: "text.secondary" }}>
        {formatTemplateDate(template.lastUpdatedAt)}
      </TableCell>
      <TableCell sx={BODY_CELL_SX}>
        <CompletionTemplateCreatedBy name={template.createdByName} />
      </TableCell>
      <TableCell sx={BODY_CELL_SX}>
        <span className="flex items-center gap-1">
          <RowAction label="View details" icon={Eye} onClick={() => onView(template)} />
          {canEdit && <RowAction label="Edit" icon={Pencil} onClick={() => onEdit(template)} />}
        </span>
      </TableCell>
    </TableRow>
  );
}

export function CompletionTemplatesTable({
  templates,
  isLoading,
  hasError,
  canEdit,
  onView,
  onEdit,
}: CompletionTemplatesTableProps) {
  return (
    <Table
      stickyHeader
      size="small"
      aria-label="Completion document templates"
      sx={{ minWidth: 700 }}
    >
      <TableHead>
        <TableRow>
          <TableCell sx={{ ...HEAD_CELL_SX, width: 360 }}>Document Title</TableCell>
          <TableCell sx={{ ...HEAD_CELL_SX, width: 140 }}>Last Updated</TableCell>
          <TableCell sx={{ ...HEAD_CELL_SX, width: 180 }}>Created By</TableCell>
          <TableCell sx={{ ...HEAD_CELL_SX, width: 90 }}>
            <span className="sr-only">Actions</span>
          </TableCell>
        </TableRow>
      </TableHead>
      <TableBody>
        {isLoading && <TableLoadingRow colSpan={4} />}
        {!isLoading && !hasError && templates.length === 0 && <EmptyRow />}
        {templates.map((template) => (
          <TemplateRow
            key={template.id}
            template={template}
            canEdit={canEdit}
            onView={onView}
            onEdit={onEdit}
          />
        ))}
      </TableBody>
    </Table>
  );
}