import gradio as gr
from datetime import datetime, timedelta
import google.generativeai as genai
from github import Github, GithubException
import docx
import re

def extract_repo_name(github_url):
    # Use regex to extract the username and repo name from the URL
    match = re.search(r'github\.com/([^/]+)/([^/]+)', github_url)
    if match:
        return f"{match.group(1)}/{match.group(2)}"
    return None

def generate_release_notes(github_url, github_token, gemini_api_key, start_date, end_date):
    try:
        g = Github(github_token)
        
        repo_name = extract_repo_name(github_url)
        if not repo_name:
            return "Error: Invalid GitHub URL format.", None
        
        repo = g.get_repo(repo_name)
        
        start_date = datetime.strptime(start_date, "%Y-%m-%d")
        end_date = datetime.strptime(end_date, "%Y-%m-%d")
        commits = list(repo.get_commits(since=start_date, until=end_date))
        
        commit_messages = [commit.commit.message for commit in commits]
        commit_text = "\n".join(commit_messages)
        
        if not commit_text:
            return "No commits found in the specified date range.", None
        
        genai.configure(api_key=gemini_api_key)
        model = genai.GenerativeModel('gemini-2.5-pro-preview-03-25')
        
        prompt = f"""Based on the following commit messages, generate comprehensive release notes:

        {commit_text}

        Please organize the release notes into sections such as:
        1. New Features
        2. Bug Fixes
        3. Improvements
        4. Breaking Changes (if any)

        Provide a concise summary for each item. Do not include any links, but keep issue numbers if present.
        
        Important formatting instructions:
        - Do not use any Markdown syntax (*, #, `, etc.)
        - Use plain text only
        - For section headers, simply use the text as is (e.g., "New Features:")
        - For list items, use simple numbers or bullet points (•) followed by a space
        - Keep the text structure simple and easy to convert to a Word document format
        """

        response = model.generate_content(prompt)
        release_notes = response.text
        
        doc = docx.Document()
        doc.add_heading('Release Notes', 0)
        
        for line in release_notes.split('\n'):
            if line.strip().endswith(':'):
                doc.add_heading(line.strip(), level=1)
            elif line.strip().startswith('•') or (line.strip() and line.strip()[0].isdigit()):
                doc.add_paragraph(line.strip(), style='List Bullet')
            else:
                doc.add_paragraph(line)
        
        temp_file = "release_notes.docx"
        doc.save(temp_file)
        
        return release_notes, temp_file
    
    except GithubException as e:
        if e.status == 401:
            return "Error: Invalid GitHub token or insufficient permissions.", None
        elif e.status == 404:
            return f"Error: Repository not found. Please check the GitHub URL. Attempted to access: {repo_name}", None
        else:
            return f"GitHub API error: {str(e)}", None
    except Exception as e:
        return f"An error occurred: {str(e)}", None

default_end_date = datetime.now()
default_start_date = default_end_date - timedelta(days=30)

iface = gr.Interface(
    fn=generate_release_notes,
    inputs=[
        gr.Textbox(label="GitHub Repository URL", placeholder="https://github.com/MicroHealthLLC/maiko-assistant"),
        gr.Textbox(label="GitHub Personal Access Token", type="password"),
        gr.Textbox(label="Gemini API Key", type="password"),
        gr.Textbox(
            label="Start Date",
            placeholder="YYYY-MM-DD",
            value=default_start_date.strftime("%Y-%m-%d"),
        ),
        gr.Textbox(
            label="End Date",
            placeholder="YYYY-MM-DD",
            value=default_end_date.strftime("%Y-%m-%d"),
        )
    ],
    outputs=[
        gr.Textbox(label="Generated Release Notes"),
        gr.File(label="Download Release Notes")
    ],
    title="Automated Release Notes Generator",
    description="Generate release notes based on GitHub commits using Gemini AI. Enter start and end dates (YYYY-MM-DD) to define the time range for commits.",
    allow_flagging="never",
    theme="default",
    analytics_enabled=False,
)

iface.launch()