// Copyright 2022 Terin Stock.
// SPDX-License-Identifier: MPL-2.0

package cgit

import (
	"fmt"
	"log/slog"
	"net/http"
	"net/http/cgi"
	"path/filepath"

	"go.terinstock.com/cgit-httpd/server"
)

type Options struct {
	CGI        string
	ReposRoot  string
	AssetsDir  string
	ConfigFile string
	Logger     *slog.Logger
}

type Builder struct {
	handler   *cgi.Handler
	register  Register
	assetsDir string
}

type Register interface {
	Register(path string, handler http.Handler)
}

func New(options Options) *Builder {
	return &Builder{
		handler: &cgi.Handler{
			Path: options.CGI,
			Dir:  options.ReposRoot,
			Env: []string{
				fmt.Sprintf("CGIT_CONFIG=%s", options.ConfigFile),
			},
			Logger: slog.NewLogLogger(options.Logger.Handler(), slog.LevelInfo),
		},
		assetsDir: options.AssetsDir,
	}
}

func (b *Builder) WithRegister(r Register) *Builder {
	b.register = r
	return b
}

func (b *Builder) Build() (http.Handler, error) {
	for _, a := range []string{"cgit.css", "cgit.png", "cgit.ico", "robots.txt"} {
		b.register.Register("/"+a, server.FileHandler(filepath.Join(b.assetsDir, a)))
	}
	b.register.Register("/{_:.*}", b.handler)

	return b.handler, nil
}