#!/usr/bin/env python3
from __future__ import annotations

import json
import os
import subprocess
import sys
from pathlib import Path
from typing import Any

SCRIPT_DIR = Path(__file__).resolve().parent
GENERATE_SCRIPT = SCRIPT_DIR / "generate_table.py"
ENV_PATH = Path.home() / ".openclaw" / ".env"


class SendTableError(RuntimeError):
    pass


def load_env_file(path: Path) -> dict[str, str]:
    values: dict[str, str] = {}
    if not path.exists():
        return values

    for raw_line in path.read_text(encoding="utf-8").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        values[key.strip()] = value.strip().strip('"').strip("'")
    return values


def resolve_credentials(bot_token: str | None, chat_id: str | None) -> tuple[str, str]:
    env_values = load_env_file(ENV_PATH)
    token = bot_token or os.environ.get("BOT_TOKEN") or env_values.get("BOT_TOKEN")
    chat = chat_id or os.environ.get("CHAT_ID") or env_values.get("CHAT_ID")

    if not token:
        raise SendTableError("BOT_TOKEN is required (arg or ~/.openclaw/.env)")
    if not chat:
        raise SendTableError("CHAT_ID is required (arg or ~/.openclaw/.env)")

    return token, chat


def parse_args(argv: list[str]) -> tuple[str, dict[str, Any], str | None, str | None]:
    if len(argv) < 2:
        raise SendTableError("Usage: ./send_table.py TITLE JSON [BOT_TOKEN] [CHAT_ID]")

    title = argv[0]
    raw_json = argv[1]
    bot_token = argv[2] if len(argv) >= 3 else None
    chat_id = argv[3] if len(argv) >= 4 else None

    try:
        payload = json.loads(raw_json)
    except json.JSONDecodeError as exc:
        raise SendTableError(f"Invalid JSON: {exc}") from exc

    if not isinstance(payload, dict):
        raise SendTableError("JSON payload must be an object")

    payload["title"] = title
    return title, payload, bot_token, chat_id


def generate_png(payload: dict[str, Any]) -> Path:
    result = subprocess.run(
        [sys.executable, str(GENERATE_SCRIPT)],
        input=json.dumps(payload, ensure_ascii=False),
        text=True,
        capture_output=True,
        check=False,
    )

    if result.returncode != 0:
        raise SendTableError(result.stderr.strip() or "generate_table.py failed")

    output = result.stdout.strip()
    if not output:
        raise SendTableError("generate_table.py did not return output path")

    path = Path(output)
    if not path.exists():
        raise SendTableError(f"Generated file not found: {path}")

    return path


def send_photo(bot_token: str, chat_id: str, title: str, image_path: Path) -> int:
    caption = title[:1024]
    url = f"https://api.telegram.org/bot{bot_token}/sendPhoto"
    command = [
        "curl",
        "--silent",
        "--show-error",
        "--fail",
        "-X",
        "POST",
        url,
        "-F",
        f"chat_id={chat_id}",
        "-F",
        f"caption={caption}",
        "-F",
        f"photo=@{image_path}",
    ]
    result = subprocess.run(command, text=True, capture_output=True, check=False)

    if result.returncode != 0:
        raise SendTableError(result.stderr.strip() or "curl sendPhoto failed")

    try:
        response = json.loads(result.stdout)
    except json.JSONDecodeError as exc:
        raise SendTableError(f"Telegram API returned invalid JSON: {exc}") from exc

    if not response.get("ok"):
        raise SendTableError(f"Telegram API error: {response}")

    message_id = response.get("result", {}).get("message_id")
    if message_id is None:
        raise SendTableError("Telegram response missing message_id")

    return int(message_id)


def main() -> int:
    try:
        title, payload, bot_token, chat_id = parse_args(sys.argv[1:])
        token, chat = resolve_credentials(bot_token, chat_id)
        image_path = generate_png(payload)
        message_id = send_photo(token, chat, title, image_path)
    except SendTableError as exc:
        print(str(exc), file=sys.stderr)
        return 1
    except Exception as exc:  # pragma: no cover - defensive CLI handling
        print(f"Unexpected error: {exc}", file=sys.stderr)
        return 1

    print(message_id)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())