package main

import (
	"context"
	"fmt"
	"strings"

	"github.com/go-kit/log/level"

	sr "tildegit.org/tjp/sliderule"
	"tildegit.org/tjp/sliderule/contrib/cgi"
	"tildegit.org/tjp/sliderule/contrib/fs"
	"tildegit.org/tjp/sliderule/logging"
	"tildegit.org/tjp/sliderule/nex"
	"tildegit.org/tjp/syw"
)

func buildNexServer(server Server, config *Configuration) (sr.Server, error) {
	addr := fmt.Sprintf("%s:%d", server.IP.String(), server.Port)

	baselog := BaseLogger(config)
	info := level.Info(baselog)
	errlog := level.Error(baselog)

	_ = info.Log("msg", "starting nex server", "addr", addr)

	hostname := ""
	if len(server.Hostnames) > 0 {
		hostname = server.Hostnames[0]
	}

	if server.TLS != nil {
		return nex.NewTLSServer(
			context.Background(),
			hostname,
			"tcp",
			addr,
			logging.LogRequests(info)(routes(server)),
			errlog,
			server.TLS,
		)
	} else {
		return nex.NewServer(
			context.Background(),
			hostname,
			"tcp",
			addr,
			logging.LogRequests(info)(routes(server)),
			errlog,
		)
	}
}

func addNexRoute(router *sr.Router, route RouteDirective) {
	switch route.Type {
	case "static":
		addNexStaticRoute(router, route)
	case "cgi":
		buildAndAddRoute(router, route, func(route RouteDirective) sr.Handler {
			return cgi.NexCGIDirectory(route.FsPath, route.URLPath, route.Modifiers.ExecCmd)
		})
	case "git":
		addNexGitRoute(router, route)
	}
}

func addNexStaticRoute(router *sr.Router, route RouteDirective) {
	buildAndAddRoute(router, route, func(route RouteDirective) sr.Handler {
		handlers := []sr.Handler{}

		if route.Modifiers.Exec {
			handlers = append(handlers, cgi.NexCGIDirectory(route.FsPath, route.URLPath, route.Modifiers.ExecCmd))
		}

		handlers = append(handlers, fs.NexFileHandler(route.FsPath, route.URLPath))

		if route.Modifiers.DirDefault != "" {
			handlers = append(
				handlers,
				fs.NexDirectoryDefault(route.FsPath, route.URLPath, route.Modifiers.DirDefault),
			)
		}

		if route.Modifiers.DirList {
			handlers = append(handlers, fs.NexDirectoryListing(route.FsPath, route.URLPath, nil))
		}

		return sr.FallthroughHandler(handlers...)
	})
}

func addNexGitRoute(router *sr.Router, route RouteDirective) {
	buildAndAddRoute(router, route, func(route RouteDirective) sr.Handler {
		subrouter := syw.NexRouter(route.FsPath, route.Modifiers.Templates)
		return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
			reqclone := cloneRequest(request)
			reqclone.Path = strings.TrimPrefix(reqclone.Path, route.URLPath)

			handler, params := subrouter.Match(reqclone)
			if handler == nil {
				return nil
			}
			return handler.Handle(context.WithValue(ctx, sr.RouteParamsKey, params), request)
		})
	})
}