import os
import sys
import re
import json
import requests

# --- Read inputs from environment ---
platform = os.environ.get("PLATFORM", "github").lower()
token = os.environ.get("TOKEN")
owner = os.environ.get("REPO_OWNER", os.environ.get("GITHUB_REPOSITORY_OWNER"))
repo = os.environ.get("REPO_NAME", os.environ.get("GITHUB_REPOSITORY"))
pr_index = os.environ.get("PR_INDEX")
api_url = os.environ.get("API_URL", os.environ.get("GITHUB_API_URL"))
plan_file = os.environ.get("PLAN_FILE")
diff_text = os.environ.get("DIFF")  # still supported
comment_template = os.environ.get("COMMENT_TEMPLATE", "Auto-comment: changed line -> {line}")

if not token or not pr_index:
    print("TOKEN and PR_INDEX are required.", file=sys.stderr)
    sys.exit(1)

# --- Load large content from file if provided ---
content_text = None
if plan_file and os.path.exists(plan_file):
    with open(plan_file, "r", encoding="utf-8") as f:
        content_text = f.read()
elif diff_text:
    content_text = diff_text

# --- Prepare comment body ---
if not content_text:
    body = comment_template.replace("{line}", "").replace("{lines}", "")
else:
    body = comment_template.replace("{lines}", content_text).replace("{line}", "")

# --- Select API endpoint ---
if platform == "github":
    url = f"https://api.github.com/repos/{owner}/{repo}/issues/{pr_index}/comments"
elif platform == "gitea":
    if not api_url:
        print("Gitea API URL required for Gitea platform", file=sys.stderr)
        sys.exit(1)
    url = f"{api_url}/repos/{owner}/{repo}/pulls/{pr_index}/comments"
else:
    print(f"Unsupported platform: {platform}", file=sys.stderr)
    sys.exit(1)

# --- Post comment ---
headers = {"Authorization": f"token {token}", "Content-Type": "application/json"}
payload = {"body": body}
resp = requests.post(url, headers=headers, json=payload)

if resp.status_code in (200, 201):
    print("Comment posted successfully!")
    sys.exit(0)
else:
    print(f"Failed to post comment: {resp.status_code}", file=sys.stderr)
    print(resp.text, file=sys.stderr)
    sys.exit(1)