// SPDX-License-Identifier: Apache-2.0

// Copyright 2025 Suyono
//
// 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.

package watcher

import (
	"net/http"

	"gitea.suyono.dev/suyono/caddy-autoreload/autoreload"
	"github.com/caddyserver/caddy/v2"
	"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
	"go.uber.org/zap"
)

type AutoReloadWatcher struct {
	Cert   string `json:"cert,omitempty"`
	app    *autoreload.AutoReload
	logger *zap.Logger
}

func init() {
	caddy.RegisterModule(AutoReloadWatcher{})
	httpcaddyfile.RegisterHandlerDirective("auto_reload", parseCaddyWatcher)
}

func (AutoReloadWatcher) CaddyModule() caddy.ModuleInfo {
	return caddy.ModuleInfo{
		ID: "http.handlers.auto_reload_watcher",
		New: func() caddy.Module {
			return &AutoReloadWatcher{
				app: autoreload.GetAutoReload(),
			}
		},
	}
}

func (w *AutoReloadWatcher) Provision(ctx caddy.Context) error {
	w.logger = ctx.Logger(w)

	// useful for debugging
	w.logger = w.logger.WithOptions(zap.AddCaller())

	if w.app == nil {
		w.app = autoreload.GetAutoReload()
	}

	w.app.AddCertPath(w.Cert)
	w.logger.Debug("added cert into main reloader", zap.String("cert file", w.Cert))

	return nil
}

func (w *AutoReloadWatcher) ServeHTTP(wr http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
	return next.ServeHTTP(wr, r)
}

func parseCaddyWatcher(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
	w := new(AutoReloadWatcher)

	for h.Next() {
		for h.NextBlock(0) {
			switch h.Val() {
			case "cert":
				if !h.NextArg() {
					return nil, h.Err("cert require cert file path as parameter")
				}
				w.Cert = h.Val()

			default:
				return nil, h.Errf("unrecognized subdirective %q", h.Val())
			}
		}
	}

	return w, nil
}