#!/usr/bin/env python
# coding: utf-8

import os
import re
import base64
import sys
import subprocess
import concurrent.futures
from typing import List, Tuple
from litellm import completion
from tenacity import retry, wait_exponential, stop_after_attempt

OUTPUT_FILE = 'code_review_output.txt'
DEFAULT_MAX_WORKERS = 3

# Function to check if the current directory is a git repository root
def is_git_repository_root(directory: str) -> bool:
    return os.path.isdir(os.path.join(directory, '.git'))

def install_packages_from_file(filename: str):
    try:
        with open(filename, 'r') as f:
            for line in f:
                package_name = line.strip()
                if package_name:
                    subprocess.check_call([sys.executable, '-m', 'pip', 'install', package_name, '--quiet'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
    except Exception as e:
        print("")

def create_system_prompt() -> str:
    encoded_prompt = os.getenv('ENCODED_CODE_REVIEW_SYSTEM_PROMPT', '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')
    decoded_bytes = base64.b64decode(encoded_prompt)
    system_prompt = decoded_bytes.decode('utf-8')
    return system_prompt

def create_gpt_prompt(file_path: str, code: str) -> str:
    encoded_prompt = os.getenv('ENCODED_CODE_REVIEW_USER_PROMPT', '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')
    decoded_bytes = base64.b64decode(encoded_prompt)
    user_prompt = decoded_bytes.decode('utf-8')
    filled_prompt = user_prompt.format(file_path=file_path, code=code)
    return filled_prompt

@retry(wait=wait_exponential(multiplier=2, min=5, max=30), stop=stop_after_attempt(3))
def call_gpt_model(prompt: str) -> str:
    try:
        response = completion(
            model=os.getenv('GPT_MODEL_NAME'),
            messages=[
                {
                    "role": "system",
                    "content": create_system_prompt(),
                },
                {
                    "role": "user",
                    "content": prompt,
                }
            ],
        )
        return response['choices'][0]['message']['content'].strip()
    except Exception as e:
        print(f"An error occurred: {e}")
        raise

def get_pr_diff(directory: str, base_branch: str) -> List[str]:
    try:
        original_dir = os.getcwd()
        os.chdir(directory)
        subprocess.check_call(['git', 'fetch', 'origin', base_branch])
        diff_output = subprocess.check_output(['git', 'diff', f'origin/{base_branch}...HEAD'], text=True)
        return diff_output.splitlines()
    except subprocess.CalledProcessError as e:
        print(f"Error: {e}")
        return []
    finally:
        os.chdir(original_dir)

def extract_code_from_diff(diff_lines: List[str]) -> List[Tuple[str, str]]:
    code_snippets = []
    file_path = ""
    code = ""
    for line in diff_lines:
        if line.startswith('+++ b/'):
            if file_path and code:
                if file_path.endswith(('.js', '.jsx', '.ts', '.tsx')):
                    code_snippets.append((file_path, code))
                code = ""
            file_path = line[6:]
        elif line.startswith('+') and not line.startswith('++'):
            code += line[1:] + '\n'
    if file_path and code:
        if file_path.endswith(('.js', '.jsx', '.ts', '.tsx')):
            code_snippets.append((file_path, code))
    return code_snippets

def generate_review_for_file(file_path: str, code: str) -> str:
    try:
        print("Generating review for file path ", file_path)
        prompt = create_gpt_prompt(file_path, code)
        gpt_response = call_gpt_model(prompt)
        if gpt_response.strip() and "no major issues found" not in gpt_response.lower():
            return gpt_response
    except Exception as e:
        print(f"Failed to generate review for file {file_path}: {e}")
    return ""

def generate_reviews(code_snippets: List[Tuple[str, str]], output_file: str, max_workers) -> List[str]:
    reviews = []
    with concurrent.futures.ThreadPoolExecutor(max_workers=max_workers) as executor:
        future_to_file = {
            executor.submit(generate_review_for_file, file_path, code): (file_path, code)
            for file_path, code in code_snippets
        }

        for future in concurrent.futures.as_completed(future_to_file):
            file_path, code = future_to_file[future]
            try:
                gpt_response = future.result()
                if gpt_response:
                    reviews.append(gpt_response)
                    with open(output_file, 'a') as f:
                        f.write(gpt_response)
                        f.write("\n---*---\n\n")
            except Exception as e:
                print(f"Failed to generate review for file {file_path}: {e}")

    return reviews

def run_analysis(directory, output_file, max_workers):
    review_mode = os.getenv('REVIEW_MODE', 'pr')
    if not is_git_repository_root(directory):
        response = "Failure :: This script must be run at the root of a Git repository."
        with open(output_file, 'a') as f:
            f.write(response)
            f.write("\n---*---\n")
        return

    print("Running in mode : ", review_mode)
    base_branch = os.getenv('BASE_BRANCH', 'master')
    diff_lines = get_pr_diff(directory, base_branch)
    code_snippets = extract_code_from_diff(diff_lines)
    report = generate_reviews(code_snippets, output_file, max_workers)
    print(report)

if __name__ == "__main__":
    if os.path.exists(OUTPUT_FILE):
            os.remove(OUTPUT_FILE)
    if len(sys.argv) != 2:
        response = "Usage: python generic_code_review directory"
        with open(OUTPUT_FILE, 'a') as f:
            f.write(response)
            f.write("\n---*---\n")
    else:
        directory = sys.argv[1]
        install_packages_from_file('requirements.txt')
        run_analysis(directory, OUTPUT_FILE, os.getenv('CODE_CRITIC_MAX_WORKERS', DEFAULT_MAX_WORKERS))