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

def generate_release_notes(github_repo, github_token, gemini_api_key, start_date, end_date):
    try:
        g = Github(github_token)
        
        repo = g.get_repo(github_repo)
        
        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, 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:
        - The output should be plain text without any markdown or "-" for post processing
        - Use section titles followed by a colon (e.g., "New Features:")
        - Start each item on a new line
        - Be sure to briefly explain the why and benefits of the change for average users that are non-technical
        """

        response = model.generate_content(prompt)
        release_notes = response.text
        
        # Create DOCX file
        doc = docx.Document()
        doc.add_heading('Release Notes', 0)
        
        current_section = None
        for line in release_notes.split('\n'):
            line = line.strip()
            if line.endswith(':'):
                doc.add_heading(line, level=1)
                current_section = None
            elif line:
                if current_section is None:
                    current_section = doc.add_paragraph().style
                    current_section.name = 'List Bullet'
                doc.add_paragraph(line, style=current_section)
        
        with tempfile.NamedTemporaryFile(delete=False, suffix='.docx') as temp_docx:
            doc.save(temp_docx.name)
            docx_path = temp_docx.name

        # Create Markdown file
        markdown_content = "# Release Notes\n\n"
        for line in release_notes.split('\n'):
            line = line.strip()
            if line.endswith(':'):
                markdown_content += f"\n## {line}\n\n"
            elif line:
                markdown_content += f"- {line}\n"

        with tempfile.NamedTemporaryFile(delete=False, suffix='.md', mode='w', encoding='utf-8') as temp_md:
            temp_md.write(markdown_content)
            md_path = temp_md.name
        
        return release_notes, docx_path, md_path
    
    except GithubException as e:
        if e.status == 401:
            return "Error: Invalid GitHub token or insufficient permissions.", None, None
        elif e.status == 404:
            return f"Error: Repository not found. Please check the GitHub repository name. Attempted to access: {github_repo}", None, None
        else:
            return f"GitHub API error: {str(e)}", None, None
    except Exception as e:
        return f"An error occurred: {str(e)}", None, 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 Name", placeholder="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 (DOCX)"),
        gr.File(label="Download Release Notes (Markdown)")
    ],
    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()