package router

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"

	"go.jolheiser.com/cabinet/internal/static"
	"go.jolheiser.com/cabinet/internal/workspace"

	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/rs/zerolog/log"
)

type Cabinet interface {
	Meta(string) (workspace.Meta, error)
	Read(string) (io.ReadCloser, error)
	Add(io.Reader, workspace.Meta) (string, error)
	Token(string) (workspace.Token, error)
	IsProtected() (bool, error)
}

func New(domain string, c Cabinet, limit *Limit) *chi.Mux {
	m := chi.NewMux()
	m.Use(middleware.StripSlashes)
	m.Use(middleware.Logger)
	m.Use(middleware.Recoverer)

	middleware.DefaultLogger = middleware.RequestLogger(&middleware.DefaultLogFormatter{
		Logger:  &log.Logger,
		NoColor: true,
	})

	s := Store{
		domain: domain,
		c:      c,
	}

	m.Get("/", index(domain))
	m.Mount("/css/", http.StripPrefix("/css/", http.FileServer(http.FS(static.CSS))))

	m.Route("/r", func(r chi.Router) {
		r.Get("/{id}", s.GetRedirect)
		r.With(limit.redirect, tokenMiddleware(c, workspace.TokenRedirect)).Post("/", s.AddRedirect)
	})

	m.Route("/f", func(r chi.Router) {
		r.Get("/{id}", s.GetFile)
		r.With(limit.file, tokenMiddleware(c, workspace.TokenFile)).Post("/", s.AddFile)
	})

	return m
}

func index(domain string) func(w http.ResponseWriter, r *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := static.Index.Execute(w, domain); err != nil {
			log.Err(err).Msg("could not execute index template")
		}
	}
}

type Store struct {
	domain string
	c      Cabinet
}

func (s *Store) AddRedirect(w http.ResponseWriter, r *http.Request) {
	u := r.FormValue("url")
	if u == "" {
		http.Error(w, "Expected a url", http.StatusBadRequest)
		return
	}

	_, err := url.Parse(u)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	id, err := s.c.Add(strings.NewReader(u), workspace.Meta{
		Type: workspace.TypeRedirect,
		Name: u,
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	if _, err := w.Write([]byte(fmt.Sprintf("%s/r/%s", s.domain, id))); err != nil {
		log.Err(err).Msg("could not write response")
	}
}

func (s *Store) GetRedirect(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	meta, err := s.c.Meta(id)
	if err != nil {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}

	if meta.Type != workspace.TypeRedirect {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}

	rc, err := s.c.Read(id)
	if err != nil {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}
	defer rc.Close()

	redirect, err := io.ReadAll(rc)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	http.Redirect(w, r, string(redirect), http.StatusFound)
}

func (s *Store) AddFile(w http.ResponseWriter, r *http.Request) {
	fi, fh, err := r.FormFile("file")
	if err != nil {
		http.Error(w, "Could not open form file", http.StatusBadRequest)
		return
	}
	defer fi.Close()

	id, err := s.c.Add(fi, workspace.Meta{
		Type: workspace.TypeFile,
		Name: fh.Filename,
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	if _, err := w.Write([]byte(fmt.Sprintf("%s/f/%s", s.domain, id))); err != nil {
		log.Err(err).Msg("could not write response")
	}
}

func (s *Store) GetFile(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	meta, err := s.c.Meta(id)
	if err != nil {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}

	if meta.Type != workspace.TypeFile {
		http.Error(w, "could not find file", http.StatusNotFound)
		return
	}

	rc, err := s.c.Read(id)
	if err != nil {
		http.Error(w, "could not read file", http.StatusInternalServerError)
		return
	}
	defer rc.Close()

	w.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, meta.Name))
	if _, err := io.Copy(w, rc); err != nil {
		log.Err(err).Msg("could not write response")
	}
}