"""Common Rich rendering helpers for CLI command modules."""
from __future__ import annotations

import shutil
from collections.abc import Callable, Mapping, Sequence
from typing import TypeVar, cast

from rich.console import Console
from rich.table import Table
from rich.tree import Tree

Row = object
CellValue = object
Column = tuple[str, Callable[[Row], CellValue]]
T = TypeVar("T")


def item_value(item: Row, name: str, default: T | None = None) -> CellValue | T | None:
  """Read *name* from a dict-like or attribute object."""
  if isinstance(item, Mapping):
    return cast(Mapping[str, CellValue], item).get(name, default)
  return getattr(item, name, default)

def text_value(value: CellValue | None, default: str = "") -> str:
  """Coerce a nullable cell value to display text."""
  return default if value is None else str(value)

def int_value(value: CellValue | None, default: int = 0) -> int:
  """Coerce a cell value to int, falling back when conversion is not possible."""
  try:
    return int(cast(int | str | float | bool, value))
  except (TypeError, ValueError):
    return default

def shorten(value: str | None, limit: int) -> str:
  """Return *value* shortened to *limit* cells-ish, using an ellipsis."""
  value = value or ""
  return value if len(value) <= limit else value[:max(0, limit - 1)] + "…"

def terminal_width(console: Console | None = None, *, fallback: int = 120) -> int:
  """Best-effort terminal width for interactive and redirected output.

  Rich falls back to 80 columns when stdout is redirected. browser-cli output is
  often piped into files for inspection, so also consult ``shutil``/``COLUMNS``
  and prefer the wider value.
  """
  rich_width = (console.width if console is not None else 0) or 0
  shell_width = shutil.get_terminal_size((fallback, 20)).columns
  return max(rich_width, shell_width)

def tree_title_limit(*, console: Console | None = None, show_browser: bool = False, show_urls: bool = False) -> int:
  """Title width for tree labels, reserving space for branches/IDs/metadata."""
  reserve = 48 if show_urls else 32
  if show_browser:
    reserve += 4
  return max(50, terminal_width(console) - reserve)

def tree_url_limit(title_limit: int, *, console: Console | None = None) -> int:
  """URL width for tree labels when URLs are displayed."""
  return max(35, terminal_width(console) - title_limit - 40)

def print_tree(tree: Tree, *, console: Console | None = None) -> None:
  """Render a Rich tree using the detected full terminal width."""
  Console(width=terminal_width(console)).print(tree)

def print_table_rows(
  rows: Sequence[Row],
  columns: Sequence[Column],
  *,
  console: Console,
  empty_message: str,
  show_header: bool = True,
  header_style: str = "bold cyan",
) -> None:
  """Render a small Rich table from arbitrary row objects."""
  if not rows:
    console.print(empty_message)
    return
  table = Table(show_header=show_header, header_style=header_style)
  for header, _getter in columns:
    table.add_column(header)
  for row in rows:
    table.add_row(*[text_value(getter(row)) for _header, getter in columns])
  Console(width=terminal_width(console)).print(table)

def print_browser_grouped_table_rows(
  rows: Sequence[Row],
  columns: Sequence[Column],
  *,
  console: Console,
  empty_message: str,
  browser_getter: Callable[[Row], CellValue | None] = lambda row: item_value(row, "browser"),
  group_getter: Callable[[Row], CellValue | None] = lambda row: item_value(row, "browser_group", item_value(row, "browserGroup")),
  browser_header: str = "Browser",
  show_header: bool = True,
  header_style: str = "bold cyan",
) -> None:
  """Render rows with optional local/remote browser grouping.

  Rows without a browser label are rendered as a normal table. Rows with
  ``browser_group``/``browserGroup`` get a group header (for example ``local``
  or a remote host) and a short indented profile label below it.
  """
  if not rows:
    console.print(empty_message)
    return

  show_browser = any(bool(browser_getter(row)) for row in rows)
  if not show_browser:
    print_table_rows(
      rows,
      columns,
      console=console,
      empty_message=empty_message,
      show_header=show_header,
      header_style=header_style,
    )
    return

  table = Table(show_header=show_header, header_style=header_style)
  table.add_column(browser_header, no_wrap=True)
  for header, _getter in columns:
    table.add_column(header)

  rendered_groups: set[str] = set()
  for row in rows:
    browser = text_value(browser_getter(row))
    group = text_value(group_getter(row))
    if group:
      if group not in rendered_groups:
        table.add_row(f"[bold]{group}[/bold]", *["" for _header, _getter in columns])
        rendered_groups.add(group)
      browser = browser.removeprefix(f"{group}:")
      browser = f"  {browser}"
    table.add_row(browser, *[text_value(getter(row)) for _header, getter in columns])

  Console(width=terminal_width(console)).print(table)