package route

import (
	"errors"
	"leech/config"
	"leech/html"
	"leech/thumbnail"
	"net/url"
	"os"
	"path"
	"sort"
	"strings"

	"github.com/gofiber/fiber/v2"
)

func RecursivelyGetSize(completePath string) (int64, error) {
	files, err := os.ReadDir(completePath)
	if err != nil {
		return -1, err
	}
	var sum int64
	for _, f := range files {
		dirEntryInfo, err := f.Info()
		if err != nil {
			return -1, err
		}
		dirEntrySize := dirEntryInfo.Size()
		if f.IsDir() {
			dirEntrySize, err = RecursivelyGetSize(path.Join(completePath, f.Name()))
			if err != nil {
				return -1, err
			}
		}
		sum += dirEntrySize
	}
	return sum, nil
}

func HandleList(c *fiber.Ctx) error {
	encodedReq := c.Path()[1:]
	req, err := url.QueryUnescape(encodedReq)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).SendString(err.Error())
	}
	c.Set(fiber.HeaderContentType, fiber.MIMETextHTML)
	if req == "" {
		keys := make([]string, 0, len(config.Config.ServeDirs))
		for k := range config.Config.ServeDirs {
			keys = append(keys, k)
		}
		sort.Strings(keys)

		entries := make([]html.Entry, 0, len(config.Config.ServeDirs))
		for _, key := range keys {
			dirEntrySize, err := RecursivelyGetSize(config.Config.ServeDirs[key])
			if err != nil {
				return c.Status(fiber.StatusInternalServerError).SendString(err.Error())
			}
			entries = append(entries, html.Entry{
				Name:  key,
				Size:  dirEntrySize,
				IsDir: true,
			})
		}

		return c.SendString(html.FileListPage(req, entries))
	} else {
		pathSlice := strings.Split(req, "/")
		pathBase, ok := config.Config.ServeDirs[pathSlice[0]]
		if ok {
			pathSlice[0] = pathBase
			completePath := path.Join(pathSlice...)
			files, err := os.ReadDir(completePath)
			if err != nil {
				return c.Status(fiber.StatusInternalServerError).SendString(err.Error())
			}
			entries := []html.Entry{}
			for _, f := range files {
				dirEntryInfo, err := f.Info()
				if err != nil {
					return c.Status(fiber.StatusInternalServerError).SendString("Internal server error!")
				}
				dirEntrySize := dirEntryInfo.Size()
				if f.IsDir() {
					dirEntrySize, err = RecursivelyGetSize(path.Join(completePath, f.Name()))
					if err != nil {
						return c.Status(fiber.StatusInternalServerError).SendString(err.Error())
					}
				}
				entries = append(entries, html.Entry{
					Name:  f.Name(),
					Size:  dirEntrySize,
					IsDir: f.IsDir(),
				})
			}
			return c.SendString(html.FileListPage(req, entries))
		} else {
			return c.Status(fiber.StatusNotFound).SendString("Sorry can't find that!")
		}
	}
}

func HandleThumb(c *fiber.Ctx) error {
	encodedReq := c.Path()[1:]
	req, err := url.QueryUnescape(encodedReq)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).SendString(err.Error())
	}
	c.Set(fiber.HeaderContentType, fiber.MIMETextHTML)
	pathSlice := strings.Split(req, "/")
	pathSlice = pathSlice[1:]
	pathBase, ok := config.Config.ServeDirs[pathSlice[0]]
	if ok {
		pathSlice[0] = pathBase
		completePath := path.Join(pathSlice...)
		if file_info, err := os.Stat(completePath); err == nil {
			if file_info.IsDir() {
				return c.Status(fiber.StatusUnauthorized).SendString("Sorry that's a directory!")
			}
			thumbnail.GetThumbnail(c, completePath)
		} else if errors.Is(err, os.ErrNotExist) {
			return c.Status(fiber.StatusNotFound).SendString("Sorry can't find that!")
		} /* else {
			// Schrodinger: file may or may not exist. See err for details.

			// Therefore, do *NOT* use !os.IsNotExist(err) to test for file existence

		} */
	} else {
		return c.Status(fiber.StatusNotFound).SendString("Sorry can't find that!")
	}
	return nil
}