#
#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#

import base64
import json
import re
import aiosmtplib
from email.mime.text import MIMEText
from email.header import Header
from common import settings
from quart import render_template_string
from api.utils.email_templates import EMAIL_TEMPLATES
from selenium import webdriver
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.common.by import By
from selenium.webdriver.support.expected_conditions import staleness_of
from selenium.webdriver.support.ui import WebDriverWait
from webdriver_manager.chrome import ChromeDriverManager


OTP_LENGTH = 4
OTP_TTL_SECONDS = 5 * 60  # valid for 5 minutes
ATTEMPT_LIMIT = 5  # maximum attempts
ATTEMPT_LOCK_SECONDS = 30 * 60  # lock for 30 minutes
RESEND_COOLDOWN_SECONDS = 60  # cooldown for 1 minute


from api.utils.file_response import (  # noqa: F401
    CONTENT_TYPE_MAP,
    FORCE_ATTACHMENT_CONTENT_TYPES,
    FORCE_ATTACHMENT_EXTENSIONS,
    agent_attachment_preview_path,
    apply_download_file_response_headers,
    apply_preview_file_response_headers,
    resolve_attachment_content_type,
    sanitize_content_disposition_filename,
    should_force_attachment,
)


def apply_safe_file_response_headers(response, content_type: str | None, ext: str | None = None):
    if content_type:
        response.headers.set("Content-Type", content_type)
    force_attachment = should_force_attachment(ext, content_type)
    if force_attachment:
        response.headers.set("X-Content-Type-Options", "nosniff")
        response.headers.set("Content-Disposition", "attachment")
    return response


def html2pdf(
    source: str,
    timeout: int = 2,
    install_driver: bool = True,
    print_options: dict = {},
):
    result = __get_pdf_from_html(source, timeout, install_driver, print_options)
    return result


def __send_devtools(driver, cmd, params={}):
    resource = "/session/%s/chromium/send_command_and_get_result" % driver.session_id
    url = driver.command_executor._url + resource
    body = json.dumps({"cmd": cmd, "params": params})
    response = driver.command_executor._request("POST", url, body)

    if not response:
        raise Exception(response.get("value"))

    return response.get("value")


def __get_pdf_from_html(path: str, timeout: int, install_driver: bool, print_options: dict):
    webdriver_options = Options()
    webdriver_prefs = {}
    webdriver_options.add_argument("--headless")
    webdriver_options.add_argument("--disable-gpu")
    webdriver_options.add_argument("--no-sandbox")
    webdriver_options.add_argument("--disable-dev-shm-usage")
    webdriver_options.experimental_options["prefs"] = webdriver_prefs

    webdriver_prefs["profile.default_content_settings"] = {"images": 2}

    if install_driver:
        service = Service(ChromeDriverManager().install())
        driver = webdriver.Chrome(service=service, options=webdriver_options)
    else:
        driver = webdriver.Chrome(options=webdriver_options)

    driver.get(path)

    try:
        WebDriverWait(driver, timeout).until(staleness_of(driver.find_element(by=By.TAG_NAME, value="html")))
    except TimeoutException:
        pass

    try:
        calculated_print_options = {
            "landscape": False,
            "displayHeaderFooter": False,
            "printBackground": True,
            "preferCSSPageSize": True,
        }
        calculated_print_options.update(print_options)
        result = __send_devtools(driver, "Page.printToPDF", calculated_print_options)
        return base64.b64decode(result["data"])
    finally:
        driver.quit()


def is_valid_url(url: str) -> bool:
    if not re.match(r"(https?)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]", url):
        return False
    from common.ssrf_guard import assert_url_is_safe

    try:
        assert_url_is_safe(url)
        return True
    except ValueError:
        return False


def safe_json_parse(data: str | dict) -> dict:
    if isinstance(data, dict):
        return data
    try:
        return json.loads(data) if data else {}
    except (json.JSONDecodeError, TypeError):
        return {}


def get_float(req: dict, key: str, default: float | int = 10.0) -> float:
    try:
        parsed = float(req.get(key, default))
        return parsed if parsed > 0 else default
    except (TypeError, ValueError):
        return default


async def send_email_html(to_email: str, subject: str, template_key: str, **context):
    body = await render_template_string(EMAIL_TEMPLATES.get(template_key), **context)
    msg = MIMEText(body, "plain", "utf-8")
    msg["Subject"] = Header(subject, "utf-8")
    msg["From"] = f"{settings.MAIL_DEFAULT_SENDER[0]} <{settings.MAIL_DEFAULT_SENDER[1]}>"
    msg["To"] = to_email

    smtp = aiosmtplib.SMTP(
        hostname=settings.MAIL_SERVER,
        port=settings.MAIL_PORT,
        use_tls=True,
        timeout=10,
    )

    await smtp.connect()
    await smtp.login(settings.MAIL_USERNAME, settings.MAIL_PASSWORD)
    await smtp.send_message(msg)
    await smtp.quit()


async def send_invite_email(to_email, invite_url, tenant_id, inviter):
    # Reuse the generic HTML sender with 'invite' template
    await send_email_html(
        to_email=to_email,
        subject="RAGFlow Invitation",
        template_key="invite",
        email=to_email,
        invite_url=invite_url,
        tenant_id=tenant_id,
        inviter=inviter,
    )


def otp_keys(email: str):
    email = (email or "").strip().lower()
    return (
        f"otp:{email}",
        f"otp_attempts:{email}",
        f"otp_last_sent:{email}",
        f"otp_lock:{email}",
    )


def hash_code(code: str, salt: bytes) -> str:
    import hashlib
    import hmac

    return hmac.new(salt, (code or "").encode("utf-8"), hashlib.sha256).hexdigest()


def captcha_key(email: str) -> str:
    return f"captcha:{email}"
