from flask import render_template, request, redirect, url_for, flash
from flask_login import login_required, current_user

from app.config import EMAIL_SERVERS_WITH_PRIORITY, EMAIL_SERVERS, DKIM_DNS_VALUE
from app.dashboard.base import dashboard_bp
from app.dns_utils import (
    get_mx_domains,
    get_spf_domain,
    get_dkim_record,
    get_txt_record,
)
from app.extensions import db
from app.models import CustomDomain, GenEmail


@dashboard_bp.route("/domains/<int:custom_domain_id>/dns", methods=["GET", "POST"])
@login_required
def domain_detail_dns(custom_domain_id):
    # only premium user can see custom domain
    if not current_user.is_premium():
        flash("Only premium user can add custom domains", "warning")
        return redirect(url_for("dashboard.index"))

    custom_domain = CustomDomain.get(custom_domain_id)
    if not custom_domain or custom_domain.user_id != current_user.id:
        flash("You cannot see this page", "warning")
        return redirect(url_for("dashboard.index"))

    mx_ok = spf_ok = dkim_ok = True
    mx_errors = spf_errors = dkim_errors = []

    if request.method == "POST":
        if request.form.get("form-name") == "check-mx":
            mx_domains = get_mx_domains(custom_domain.domain)

            if mx_domains != EMAIL_SERVERS:
                mx_ok = False
                mx_errors = get_mx_domains(custom_domain.domain, keep_priority=True)
            else:
                flash(
                    "Your domain is verified. Now it can be used to create custom alias",
                    "success",
                )
                custom_domain.verified = True
                db.session.commit()
                return redirect(
                    url_for(
                        "dashboard.domain_detail", custom_domain_id=custom_domain.id
                    )
                )
        elif request.form.get("form-name") == "check-spf":
            spf_domains = get_spf_domain(custom_domain.domain)
            for email_server in EMAIL_SERVERS:
                email_server = email_server[:-1]  # remove the trailing .
                if email_server not in spf_domains:
                    flash(
                        f"{email_server} is not included in your SPF record.", "warning"
                    )
                    spf_ok = False

            if spf_ok:
                custom_domain.spf_verified = True
                db.session.commit()
                flash("The SPF is setup correctly", "success")
                return redirect(
                    url_for(
                        "dashboard.domain_detail", custom_domain_id=custom_domain.id
                    )
                )
            else:
                spf_errors = get_txt_record(custom_domain.domain)

        elif request.form.get("form-name") == "check-dkim":
            dkim_record = get_dkim_record(custom_domain.domain)
            correct_dkim_record = f"v=DKIM1; k=rsa; p={DKIM_DNS_VALUE}"
            if dkim_record == correct_dkim_record:
                flash("The DKIM is setup correctly.", "success")
                custom_domain.dkim_verified = True
                db.session.commit()

                return redirect(
                    url_for(
                        "dashboard.domain_detail", custom_domain_id=custom_domain.id
                    )
                )
            else:
                dkim_ok = False
                dkim_errors = get_txt_record(f"dkim._domainkey.{custom_domain.domain}")

        elif request.form.get("form-name") == "delete":
            name = custom_domain.domain
            CustomDomain.delete(custom_domain_id)
            db.session.commit()
            flash(f"Domain {name} has been deleted", "success")

            return redirect(url_for("dashboard.custom_domain"))

    spf_include_records = []
    for priority, email_server in EMAIL_SERVERS_WITH_PRIORITY:
        spf_include_records.append(f"include:{email_server[:-1]}")

    spf_record = f"v=spf1 {' '.join(spf_include_records)} -all"

    dkim_record = f"v=DKIM1; k=rsa; p={DKIM_DNS_VALUE}"

    return render_template("dashboard/domain_detail/dns.html", **locals())


@dashboard_bp.route("/domains/<int:custom_domain_id>/info", methods=["GET", "POST"])
@login_required
def domain_detail(custom_domain_id):
    # only premium user can see custom domain
    if not current_user.is_premium():
        flash("Only premium user can add custom domains", "warning")
        return redirect(url_for("dashboard.index"))

    custom_domain = CustomDomain.get(custom_domain_id)
    if not custom_domain or custom_domain.user_id != current_user.id:
        flash("You cannot see this page", "warning")
        return redirect(url_for("dashboard.index"))

    nb_alias = GenEmail.filter_by(custom_domain_id=custom_domain.id).count()

    return render_template("dashboard/domain_detail/info.html", **locals())