"""Log viewing API blueprint.

Serves log content to the /logs page via HTMX endpoints through vacuum-walld.
"""

import logging

from flask import Blueprint, render_template_string

from daemon.client import get

logger = logging.getLogger(__name__)
bp = Blueprint("logs", __name__)

_LOG_LINE_TEMPLATE = """\
{% for line in lines %}
<div class="log-line{% if 'ERROR' in line %} log-error{% elif 'WARN' in line %} log-warn{% endif %}">{{ line | e }}</div>
{% endfor %}"""


def _render_log_lines(text: str) -> str:
    """Render raw log text into styled HTML log-line divs.

    Args:
        text: Raw log content with newline-separated lines.

    Returns:
        HTML string with color-coded log-line elements.
    """
    lines = text.rstrip("\n").split("\n") if text.strip() else []
    return render_template_string(_LOG_LINE_TEMPLATE, lines=lines)


@bp.route("/journal")
def journal():
    """GET /api/logs/journal — Return systemd journal log lines.

    Fetches the daemon's journal log content via vacuum-walld and
    renders it as styled HTML log-line elements.

    Returns:
        HTML string containing rendered journal log lines.
    """
    try:
        text = get("/logs/journal")
        return _render_log_lines(text)
    except RuntimeError:
        return _render_log_lines("(error reading journal)\n")


@bp.route("/nginx/access")
def nginx_access():
    """GET /api/logs/nginx/access — Return nginx access log lines.

    Fetches the nginx access log content via vacuum-walld and
    renders it as styled HTML log-line elements.

    Returns:
        HTML string containing rendered access log lines.
    """
    try:
        text = get("/logs/nginx/access")
        return _render_log_lines(text)
    except RuntimeError:
        return _render_log_lines("(log file not found)\n")


@bp.route("/nginx/error")
def nginx_error():
    """GET /api/logs/nginx/error — Return nginx error log lines.

    Fetches the nginx error log content via vacuum-walld and
    renders it as styled HTML log-line elements.

    Returns:
        HTML string containing rendered error log lines.
    """
    try:
        text = get("/logs/nginx/error")
        return _render_log_lines(text)
    except RuntimeError:
        return _render_log_lines("(log file not found)\n")


@bp.route("/dnsmasq")
def dnsmasq():
    """GET /api/logs/dnsmasq — Return dnsmasq log lines.

    Fetches the dnsmasq log content via vacuum-walld and
    renders it as styled HTML log-line elements.

    Returns:
        HTML string containing rendered dnsmasq log lines.
    """
    try:
        text = get("/logs/dnsmasq")
        return _render_log_lines(text)
    except RuntimeError:
        return _render_log_lines("(error reading journal)\n")


@bp.route("/app")
def app_log():
    """GET /api/logs/app — Return application log lines.

    Fetches the application log content via vacuum-walld and
    renders it as styled HTML log-line elements.

    Returns:
        HTML string containing rendered application log lines.
    """
    try:
        text = get("/logs/app")
        return _render_log_lines(text)
    except RuntimeError:
        return _render_log_lines("(log file not found)\n")