# Copyright 2025 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Progress and visualization utilities for LangExtract."""
from __future__ import annotations

from typing import Any
import urllib.parse

import tqdm

# ANSI color codes for terminal output
BLUE = "\033[94m"
GREEN = "\033[92m"
CYAN = "\033[96m"
BOLD = "\033[1m"
RESET = "\033[0m"

# Google Blue color for progress bars
GOOGLE_BLUE = "#4285F4"


def create_download_progress_bar(
    total_size: int, url: str, ncols: int = 100, max_url_length: int = 50
) -> tqdm.tqdm:
  """Create a styled progress bar for downloads.

  Args:
    total_size: Total size in bytes.
    url: The URL being downloaded.
    ncols: Number of columns for the progress bar.
    max_url_length: Maximum length to show for the URL.

  Returns:
    A configured tqdm progress bar.
  """
  # Truncate URL if too long, keeping the domain and end
  if len(url) > max_url_length:
    parsed = urllib.parse.urlparse(url)
    domain = parsed.netloc or parsed.hostname or "unknown"

    path_parts = parsed.path.strip("/").split("/")
    filename = path_parts[-1] if path_parts and path_parts[-1] else "file"

    available = max_url_length - len(domain) - len(filename) - 5
    if available > 0:
      url_display = f"{domain}/.../{filename}"
    else:
      url_display = url[: max_url_length - 3] + "..."
  else:
    url_display = url

  return tqdm.tqdm(
      total=total_size,
      unit="B",
      unit_scale=True,
      desc=(
          f"{BLUE}{BOLD}LangExtract{RESET}: Downloading"
          f" {GREEN}{url_display}{RESET}"
      ),
      bar_format=(
          "{desc}: {percentage:3.0f}%|{bar}| {n_fmt}/{total_fmt}"
          " [{elapsed}<{remaining}, {rate_fmt}]"
      ),
      colour=GOOGLE_BLUE,
      ncols=ncols,
  )


def create_extraction_progress_bar(
    iterable: Any, model_info: str | None = None, disable: bool = False
) -> tqdm.tqdm:
  """Create a styled progress bar for extraction.

  Args:
    iterable: The iterable to wrap with progress bar.
    model_info: Optional model information to display (e.g., "gemini-1.5-pro").
    disable: Whether to disable the progress bar.

  Returns:
    A configured tqdm progress bar.
  """
  desc = format_extraction_progress(model_info)

  return tqdm.tqdm(
      iterable,
      desc=desc,
      bar_format="{desc} [{elapsed}]",
      disable=disable,
      dynamic_ncols=True,
  )


def print_download_complete(
    char_count: int, word_count: int, filename: str
) -> None:
  """Print a styled download completion message.

  Args:
    char_count: Number of characters downloaded.
    word_count: Number of words downloaded.
    filename: Name of the downloaded file.
  """
  print(
      f"{GREEN}✓{RESET} Downloaded {BOLD}{char_count:,}{RESET} characters "
      f"({BOLD}{word_count:,}{RESET} words) from {BLUE}{filename}{RESET}",
      flush=True,
  )


def print_extraction_complete() -> None:
  """Print a generic extraction completion message."""
  print(f"{GREEN}✓{RESET} Extraction processing complete", flush=True)


def print_extraction_summary(
    num_extractions: int,
    unique_classes: int,
    elapsed_time: float | None = None,
    chars_processed: int | None = None,
    num_chunks: int | None = None,
) -> None:
  """Print a styled extraction summary with optional performance metrics.

  Args:
    num_extractions: Total number of extractions.
    unique_classes: Number of unique extraction classes.
    elapsed_time: Optional elapsed time in seconds.
    chars_processed: Optional number of characters processed.
    num_chunks: Optional number of chunks processed.
  """
  print(
      f"{GREEN}✓{RESET} Extracted {BOLD}{num_extractions}{RESET} entities "
      f"({BOLD}{unique_classes}{RESET} unique types)",
      flush=True,
  )

  if elapsed_time is not None:
    metrics = []

    # Time
    metrics.append(f"Time: {BOLD}{elapsed_time:.2f}s{RESET}")

    # Speed
    if chars_processed is not None and elapsed_time > 0:
      speed = chars_processed / elapsed_time
      metrics.append(f"Speed: {BOLD}{speed:,.0f}{RESET} chars/sec")

    if num_chunks is not None:
      metrics.append(f"Chunks: {BOLD}{num_chunks}{RESET}")

    for metric in metrics:
      print(f"  {CYAN}•{RESET} {metric}", flush=True)


def create_save_progress_bar(
    output_path: str, disable: bool = False
) -> tqdm.tqdm:
  """Create a progress bar for saving documents.

  Args:
    output_path: The output file path.
    disable: Whether to disable the progress bar.

  Returns:
    A configured tqdm progress bar.
  """
  filename = output_path.split("/")[-1]
  return tqdm.tqdm(
      desc=(
          f"{BLUE}{BOLD}LangExtract{RESET}: Saving to {GREEN}{filename}{RESET}"
      ),
      unit=" docs",
      disable=disable,
  )


def create_load_progress_bar(
    file_path: str, total_size: int | None = None, disable: bool = False
) -> tqdm.tqdm:
  """Create a progress bar for loading documents.

  Args:
    file_path: The file path being loaded.
    total_size: Optional total file size in bytes.
    disable: Whether to disable the progress bar.

  Returns:
    A configured tqdm progress bar.
  """
  filename = file_path.split("/")[-1]
  if total_size:
    return tqdm.tqdm(
        total=total_size,
        desc=(
            f"{BLUE}{BOLD}LangExtract{RESET}: Loading {GREEN}{filename}{RESET}"
        ),
        unit="B",
        unit_scale=True,
        disable=disable,
    )
  else:
    return tqdm.tqdm(
        desc=(
            f"{BLUE}{BOLD}LangExtract{RESET}: Loading {GREEN}{filename}{RESET}"
        ),
        unit=" docs",
        disable=disable,
    )


def print_save_complete(num_docs: int, file_path: str) -> None:
  """Print a save completion message.

  Args:
    num_docs: Number of documents saved.
    file_path: Path to the saved file.
  """
  filename = file_path.split("/")[-1]
  print(
      f"{GREEN}✓{RESET} Saved {BOLD}{num_docs}{RESET} documents to"
      f" {GREEN}{filename}{RESET}",
      flush=True,
  )


def print_load_complete(num_docs: int, file_path: str) -> None:
  """Print a load completion message.

  Args:
    num_docs: Number of documents loaded.
    file_path: Path to the loaded file.
  """
  filename = file_path.split("/")[-1]
  print(
      f"{GREEN}✓{RESET} Loaded {BOLD}{num_docs}{RESET} documents from"
      f" {GREEN}{filename}{RESET}",
      flush=True,
  )


def get_model_info(language_model: Any) -> str | None:
  """Extract model information from a language model instance.

  Args:
    language_model: A language model instance.

  Returns:
    A string describing the model, or None if not available.
  """
  if hasattr(language_model, "model_id"):
    return language_model.model_id

  if hasattr(language_model, "model_url"):
    return language_model.model_url

  return None


def format_extraction_stats(current_chars: int, processed_chars: int) -> str:
  """Format extraction progress statistics with colors.

  Args:
    current_chars: Number of characters in current batch.
    processed_chars: Total number of characters processed so far.

  Returns:
    Formatted string with colored statistics.
  """
  current_str = f"{GREEN}{current_chars:,}{RESET}"
  processed_str = f"{GREEN}{processed_chars:,}{RESET}"
  return f"current={current_str} chars, processed={processed_str} chars"


def create_extraction_postfix(current_chars: int, processed_chars: int) -> str:
  """Create a formatted postfix string for extraction progress.

  Args:
    current_chars: Number of characters in current batch.
    processed_chars: Total number of characters processed so far.

  Returns:
    Formatted string with statistics.
  """
  current_str = f"{GREEN}{current_chars:,}{RESET}"
  processed_str = f"{GREEN}{processed_chars:,}{RESET}"
  return f"current={current_str} chars, processed={processed_str} chars"


def format_extraction_progress(
    model_info: str | None,
    current_chars: int | None = None,
    processed_chars: int | None = None,
) -> str:
  """Format the complete extraction progress bar description.

  Args:
    model_info: Optional model information (e.g., "gemini-2.0-flash").
    current_chars: Number of characters in current batch (optional).
    processed_chars: Total number of characters processed so far (optional).

  Returns:
    Formatted description string.
  """
  # Base description
  if model_info:
    desc = f"{BLUE}{BOLD}LangExtract{RESET}: model={GREEN}{model_info}{RESET}"
  else:
    desc = f"{BLUE}{BOLD}LangExtract{RESET}: Processing"

  # Add stats if provided
  if current_chars is not None and processed_chars is not None:
    current_str = f"{GREEN}{current_chars:,}{RESET}"
    processed_str = f"{GREEN}{processed_chars:,}{RESET}"
    desc += f", current={current_str} chars, processed={processed_str} chars"

  return desc


def create_pass_progress_bar(
    total_passes: int, disable: bool = False
) -> tqdm.tqdm:
  """Create a progress bar for sequential extraction passes.

  Args:
    total_passes: Total number of sequential passes.
    disable: Whether to disable the progress bar.

  Returns:
    A configured tqdm progress bar.
  """
  desc = f"{BLUE}{BOLD}LangExtract{RESET}: Extraction passes"
  return tqdm.tqdm(
      total=total_passes,
      desc=desc,
      bar_format=(
          "{desc}: {percentage:3.0f}%|{bar}| {n_fmt}/{total_fmt} [{elapsed}]"
      ),
      disable=disable,
      colour=GOOGLE_BLUE,
      ncols=100,
  )