"""GitHub operations — read, write, list files in the agent's repo."""
import base64
from datetime import datetime, timezone
from github import Github, GithubException
import config


def _client():
    return Github(config.GITHUB_TOKEN)


def _repo():
    return _client().get_repo(config.GITHUB_REPO)


# ── List ──────────────────────────────────────────────────────────────────────

def list_files(folder: str) -> list[str]:
    """Return a list of file paths inside `folder`."""
    try:
        contents = _repo().get_contents(folder)
        return [c.path for c in contents]
    except GithubException as e:
        return [f"ERROR: {e.data.get('message', str(e))}"]


# ── Read ──────────────────────────────────────────────────────────────────────

def read_file(path: str) -> str:
    """Return decoded text content of `path`."""
    try:
        file = _repo().get_contents(path)
        return base64.b64decode(file.content).decode("utf-8")
    except GithubException as e:
        return f"ERROR: {e.data.get('message', str(e))}"


# ── Write / Update ────────────────────────────────────────────────────────────

def write_file(path: str, content: str, message: str = "") -> str:
    """Create or update `path` with `content`. Returns commit SHA."""
    repo = _repo()
    commit_msg = message or f"savvy: update {path}"
    try:
        existing = repo.get_contents(path)
        result = repo.update_file(path, commit_msg, content, existing.sha)
    except GithubException:
        # File doesn't exist yet
        result = repo.create_file(path, commit_msg, content)
    return result["commit"].sha


# ── Convenience helpers ───────────────────────────────────────────────────────

def save_memory(chat_id: int | str, user_msg: str, agent_reply: str) -> str:
    """Append a conversation turn to memory/{chat_id}.md"""
    ts   = datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M:%S UTC")
    path = f"{config.MEMORY_PATH}/{chat_id}.md"

    existing = read_file(path)
    if existing.startswith("ERROR"):
        existing = f"# Memory — chat {chat_id}\n\n"

    block = f"\n---\n**{ts}**\n\n**User:** {user_msg}\n\n**Savvy:** {agent_reply}\n"
    write_file(path, existing + block, f"memory: chat {chat_id}")
    return path


def save_research(query: str, result: str) -> str:
    """Save a web search result to research/ with timestamp in filename."""
    ts       = datetime.now(timezone.utc).strftime("%Y-%m-%d_%H-%M-%S")
    safe_q   = query[:60].replace(" ", "_").replace("/", "-")
    path     = f"{config.RESEARCH_PATH}/{ts}_{safe_q}.md"
    content  = f"# Research: {query}\n\n_Saved: {ts} UTC_\n\n{result}\n"
    write_file(path, content, f"research: {query[:60]}")
    return path