from flask import Blueprint, flash, jsonify, redirect, render_template, request, url_for
from flask_login import login_required

from app.guides import GUIDES
from app.models import ApplyLog, Profile, Setting, SystemState
from app.models import utcnow
from app.services.applier import (
    APPLY_MODE_FINAL,
    APPLY_MODE_TEST,
    apply_profile,
    confirm_apply,
    emergency_restore_last_apply,
    restore_initial,
    rollback_apply,
)
from app.services.backup import get_latest_apply_backup, list_backups, restore_backup

apply_bp = Blueprint("apply", __name__, url_prefix="/apply")


@apply_bp.route("/")
@login_required
def index():
    profiles = Profile.query.order_by(Profile.name).all()
    state = SystemState.query.first()
    pending = None
    if state and state.pending_apply_log_id:
        pending = ApplyLog.query.get(state.pending_apply_log_id)

    test_minutes = int(Setting.get("test_rollback_minutes", "2") or "2")
    recent_logs = ApplyLog.query.order_by(ApplyLog.started_at.desc()).limit(10).all()
    return render_template(
        "apply/index.html",
        profiles=profiles,
        pending=pending,
        recent_logs=recent_logs,
        test_minutes=test_minutes,
        guide=GUIDES.get("profiles", {}),
    )


def _handle_apply(profile_id: int, mode: str):
    profile = Profile.query.get_or_404(profile_id)
    state = SystemState.query.first()
    if state and state.pending_apply_log_id:
        flash("یک تست در انتظار تأیید است. ابتدا آن را تأیید یا rollback کنید.", "warning")
        return redirect(url_for("apply.status", log_id=state.pending_apply_log_id))

    log = apply_profile(profile, mode=mode)
    if log.status == "failed":
        flash("اعمال پروفایل با خطا مواجه شد. تنظیمات قبلی خودکار بازگردانده شد.", "danger")
    elif mode == APPLY_MODE_FINAL:
        flash("پروفایل به‌صورت نهایی اعمال و ثبت شد.", "success")
        return redirect(url_for("main.dashboard"))
    else:
        test_minutes = log.get_details().get("rollback_minutes", 2)
        flash(
            f"تست موقت اعمال شد. {test_minutes} دقیقه برای بررسی دارید — در صورت عدم تأیید، rollback خودکار انجام می‌شود.",
            "warning",
        )
    return redirect(url_for("apply.status", log_id=log.id))


@apply_bp.route("/profile/<int:profile_id>/test", methods=["POST"])
@login_required
def apply_test(profile_id):
    return _handle_apply(profile_id, APPLY_MODE_TEST)


@apply_bp.route("/profile/<int:profile_id>/final", methods=["POST"])
@login_required
def apply_final(profile_id):
    return _handle_apply(profile_id, APPLY_MODE_FINAL)


@apply_bp.route("/status/<int:log_id>")
@login_required
def status(log_id):
    log = ApplyLog.query.get_or_404(log_id)
    details = log.get_details()
    remaining_seconds = 0
    if log.rollback_at and not log.confirmed:
        remaining_seconds = max(0, int((log.rollback_at - utcnow()).total_seconds()))
    return render_template(
        "apply/status.html",
        log=log,
        details=details,
        remaining_seconds=remaining_seconds,
        apply_mode=details.get("mode", APPLY_MODE_TEST),
    )


@apply_bp.route("/confirm/<int:log_id>", methods=["POST"])
@login_required
def confirm(log_id):
    confirm_apply(log_id)
    flash("تست موفق بود — تغییرات به‌صورت نهایی ثبت شد.", "success")
    return redirect(url_for("main.dashboard"))


@apply_bp.route("/rollback/<int:log_id>", methods=["POST"])
@login_required
def rollback(log_id):
    result = rollback_apply(log_id)
    if result.get("success"):
        flash("تنظیمات قبلی بازگردانده شد.", "info")
    else:
        flash(result.get("error", "خطا در rollback"), "danger")
    return redirect(url_for("main.dashboard"))


@apply_bp.route("/api/pending/<int:log_id>")
@login_required
def pending_api(log_id):
    log = ApplyLog.query.get_or_404(log_id)
    remaining = 0
    if log.rollback_at and not log.confirmed:
        remaining = max(0, int((log.rollback_at - utcnow()).total_seconds()))
    return jsonify(
        {
            "status": log.status,
            "confirmed": log.confirmed,
            "remaining_seconds": remaining,
        }
    )


restore_bp = Blueprint("restore", __name__, url_prefix="/restore")


@restore_bp.route("/")
@login_required
def index():
    backups = list_backups()
    state = SystemState.query.first()
    latest_apply = get_latest_apply_backup()
    return render_template(
        "restore/index.html",
        backups=backups,
        state=state,
        latest_apply_backup=str(latest_apply) if latest_apply else None,
        guide=GUIDES.get("restore", {}),
    )


@restore_bp.route("/emergency", methods=["POST"])
@login_required
def emergency_restore_view():
    result = emergency_restore_last_apply()
    if result.get("success"):
        flash(f"بازگردانی فوری انجام شد از: {result.get('backup_path', '')}", "success")
    else:
        flash(result.get("error", "خطا در بازگردانی"), "danger")
    return redirect(url_for("restore.index"))


@restore_bp.route("/initial", methods=["POST"])
@login_required
def restore_initial_view():
    result = restore_initial()
    if result.get("success"):
        flash("تنظیمات اولیه بازگردانده شد.", "success")
    else:
        flash(result.get("error", "خطا"), "danger")
    return redirect(url_for("restore.index"))


@restore_bp.route("/backup", methods=["POST"])
@login_required
def restore_backup_view():
    path = request.form.get("backup_path", "").strip()
    if not path:
        flash("مسیر backup انتخاب نشده.", "danger")
        return redirect(url_for("restore.index"))
    result = restore_backup(path)
    if result.get("success"):
        flash("backup بازگردانده شد.", "success")
    else:
        flash(result.get("error", "خطا"), "danger")
    return redirect(url_for("restore.index"))


settings_bp = Blueprint("settings", __name__, url_prefix="/settings")


@settings_bp.route("/", methods=["GET", "POST"])
@login_required
def index():
    if request.method == "POST":
        for key in (
            "auto_switch_dns",
            "auto_switch_apt",
            "auto_switch_docker",
            "auto_switch_github",
            "auto_switch_pip",
            "auto_switch_npm",
        ):
            Setting.set(key, "true" if request.form.get(key) == "on" else "false")

        Setting.set("rollback_minutes", request.form.get("rollback_minutes", "15"))
        Setting.set("test_rollback_minutes", request.form.get("test_rollback_minutes", "2"))
        Setting.set("auto_test_interval_minutes", request.form.get("auto_test_interval_minutes", "30"))
        Setting.set("max_switches_per_day", request.form.get("max_switches_per_day", "3"))
        Setting.set(
            "rollback_on_all_fail",
            "true" if request.form.get("rollback_on_all_fail") == "on" else "false",
        )
        flash("تنظیمات ذخیره شد.", "success")
        return redirect(url_for("settings.index"))

    settings = {key: Setting.get(key) for key in (
        "auto_switch_dns", "auto_switch_apt", "auto_switch_docker",
        "auto_switch_github", "auto_switch_pip", "auto_switch_npm",
        "rollback_minutes", "test_rollback_minutes", "auto_test_interval_minutes",
        "max_switches_per_day", "rollback_on_all_fail",
    )}
    return render_template("settings/index.html", settings=settings, guide=GUIDES.get("settings", {}))