"""Module for gradio interfaces."""

import os
from pathlib import Path
import gradio as gr

from translator.content import (
    fill_scaffold,
    get_content,
    get_full_prompt,
    llm_translate,
    preprocess_content,
)
from translator.retriever import report

# GitHub PR Agent import
try:
    from pr_generator.agent import GitHubPRAgent

    GITHUB_PR_AVAILABLE = True
except ImportError as e:
    print(f"⚠️ GitHub PR Agent is not available: {e}")
    GITHUB_PR_AVAILABLE = False

# GitHub configuration - must be provided by user or environment variables


def report_translation_target_files(
    translate_lang: str, top_k: int = 1
) -> tuple[str, list[list[str]]]:
    """Return the top-k files that need translation.

    Args:
        translate_lang: Target language to translate
        top_k: Number of top-first files to return for translation. (Default 1)
    """
    status_report, filepath_list = report(translate_lang, top_k)
    return status_report, [[file] for file in filepath_list]


def translate_docs(lang: str, file_path: str) -> tuple[str, str]:
    """Translate documentation."""
    # step 1. Get content from file path
    content = get_content(file_path)
    to_translate = preprocess_content(content)

    # step 2. Prepare prompt with docs content
    if lang == "ko":
        translation_lang = "Korean"
    to_translate_with_prompt = get_full_prompt(translation_lang, to_translate)

    # step 3. Translate with LLM
    # TODO: MCP clilent 넘길 부분
    callback_result, translated_content = llm_translate(to_translate_with_prompt)

    # step 4. Add scaffold to translation result
    translated_doc = fill_scaffold(content, to_translate, translated_content)

    return callback_result, translated_doc


def translate_docs_interactive(
    translate_lang: str, selected_files: list[list[str]]
) -> tuple[str, str, str]:
    """Interactive translation function that processes files one by one.

    Args:
        translate_lang: Target language to translate
        selected_files: List of file paths to translate
    """
    # Extract file paths from the dataframe format
    file_paths = [row[0] for row in selected_files if row and len(row) > 0]
    if not file_paths:
        return (
            "No files selected for translation.",
            gr.update(visible=False),
            gr.update(visible=False),
            gr.update(visible=False),
            [],
            0,
        )

    # Start with the first file
    current_file = file_paths[0]

    status = f"✅ Translation completed: `{current_file}` → `{translate_lang}`\n\n"
    callback_result, translated_content = translate_docs(translate_lang, current_file)
    status += f"💰 Used token and cost: \n```\n{callback_result}\n```"

    if len(file_paths) > 1:
        status += f"\n### 📝 Note: Currently, only the first file has been translated.\n> The remaining {len(file_paths) - 1} files have not been processed yet, as the system is in its beta version"

    return status, translated_content


def generate_github_pr(
    target_language: str,
    filepath: str,
    translated_content: str = None,
    github_config: dict = None,
) -> str:
    """Generate a GitHub PR for translated documentation.

    Args:
        target_language: Target language for translation (e.g., "ko")
        filepath: Original file path (e.g., "docs/source/en/accelerator_selection.md")
        translated_content: Translated content (if None, read from file)
        github_config: GitHub configuration dictionary

    Returns:
        PR creation result message
    """
    if not GITHUB_PR_AVAILABLE:
        return "❌ GitHub PR Agent is not available. Please install required libraries."

    if not github_config:
        return "❌ GitHub configuration not provided."

    # Validate required configuration
    required_fields = ["token", "owner", "repo_name", "reference_pr_url"]
    missing_fields = [
        field for field in required_fields if not github_config.get(field)
    ]

    if missing_fields:
        return f"❌ Missing required configuration: {', '.join(missing_fields)}. Please provide these values."

    # Set token in environment for the agent.
    os.environ["GITHUB_TOKEN"] = github_config["token"]

    try:
        # Read translated content from file if not provided
        if translated_content is None:
            translation_file_path = (
                Path(__file__).resolve().parent.parent
                / f"translation_result/{filepath}"
            )
            if not translation_file_path.exists():
                return f"❌ Translation file not found: {translation_file_path}"

            with open(translation_file_path, "r", encoding="utf-8") as f:
                translated_content = f.read()

        if not translated_content or not translated_content.strip():
            return "❌ Translated content is empty."

        # Execute GitHub PR Agent
        print(f"🚀 Starting GitHub PR creation...")
        print(f"   📁 File: {filepath}")
        print(f"   🌍 Language: {target_language}")
        print(f"   📊 Reference PR: {github_config['reference_pr_url']}")
        print(
            f"   🏠 Repository: {github_config['owner']}/{github_config['repo_name']}"
        )

        agent = GitHubPRAgent()
        result = agent.run_translation_pr_workflow(
            reference_pr_url=github_config["reference_pr_url"],
            target_language=target_language,
            filepath=filepath,
            translated_doc=translated_content,
            owner=github_config["owner"],
            repo_name=github_config["repo_name"],
            base_branch=github_config.get("base_branch", "main"),
        )

        # Process result
        if result["status"] == "success":
            return f"""✅ **GitHub PR Creation Successful!**

🔗 **PR URL:** {result["pr_url"]}
🌿 **Branch:** {result["branch"]}
📁 **File:** {result["file_path"]}

{result["message"]}"""

        elif result["status"] == "partial_success":
            return f"""⚠️ **Partial Success**

🌿 **Branch:** {result["branch"]}
📁 **File:** {result["file_path"]}

{result["message"]}

**Error Details:**
{result.get("error_details", "Unknown error")}"""

        else:
            return f"""❌ **GitHub PR Creation Failed**

**Error Message:**
{result["message"]}"""

    except Exception as e:
        error_msg = f"❌ Unexpected error occurred during PR creation: {str(e)}"
        print(error_msg)
        return error_msg


# Backward compatibility function (replaces old mock function)
def mock_generate_PR():
    """Backward compatibility function - returns warning message only"""
    return (
        "⚠️ mock_generate_PR() is deprecated. Please use generate_github_pr() instead."
    )