package cmd

import (
	"encoding/json"
	"errors"
	"fmt"
	"log"
	urllib "net/url"
	"os"
	"strings"

	"github.com/jedib0t/go-pretty/v6/table"
	cobra "github.com/spf13/cobra"

	"github.com/lapwat/papeer/book"
)

type ListOptions struct {
	// url string

	output string

	Selector    []string
	depth       int
	limit       int
	offset      int
	reverse     bool
	delay       int
	threads     int
	include     bool
	useLinkName bool
}

var listOpts *ListOptions

func init() {
	listOpts = &ListOptions{}

	listCmd.Flags().StringVarP(&listOpts.output, "output", "o", "table", "file format [table, json]")

	// common with get command
	listCmd.Flags().StringSliceVarP(&listOpts.Selector, "selector", "s", []string{}, "table of contents CSS selector")
	listCmd.Flags().IntVarP(&listOpts.depth, "depth", "d", 0, "scraping depth")
	listCmd.Flags().IntVarP(&listOpts.limit, "limit", "l", -1, "limit number of chapters, use with depth/selector")
	listCmd.Flags().IntVarP(&listOpts.offset, "offset", "", 0, "skip first chapters, use with depth/selector")
	listCmd.Flags().BoolVarP(&listOpts.reverse, "reverse", "r", false, "reverse chapter order")
	listCmd.Flags().IntVarP(&listOpts.delay, "delay", "", -1, "time in milliseconds to wait before downloading next chapter, use with depth/selector")
	listCmd.Flags().IntVarP(&listOpts.threads, "threads", "t", -1, "download concurrency, use with depth/selector")
	listCmd.Flags().BoolVarP(&listOpts.include, "include", "i", false, "include URL as first chapter, use with depth/selector")
	listCmd.Flags().BoolVarP(&listOpts.useLinkName, "use-link-name", "", false, "use link name for chapter title")

	rootCmd.AddCommand(listCmd)
}

var listCmd = &cobra.Command{
	Use:     "list URL",
	Aliases: []string{"ls"},
	Short:   "Print URL table of contents",
	Example: "papeer list https://12factor.net/ -s 'section.concrete>article>h2>a'",
	Args: func(cmd *cobra.Command, args []string) error {
		if len(args) < 1 {
			return errors.New("requires an URL argument")
		}

		// check provided output is in list
		outputEnum := map[string]bool{
			"table": true,
			"json":  true,
		}
		if outputEnum[listOpts.output] != true {
			return fmt.Errorf("invalid output specified: %s", listOpts.output)
		}

		return nil
	},
	Run: func(cmd *cobra.Command, args []string) {
		if len(listOpts.Selector) == 0 {
			listOpts.Selector = []string{""}
		}

		base, err := urllib.Parse(args[0])
		if err != nil {
			log.Fatal(err)
		}

		links, path, home, err := book.GetLinks(base, listOpts.Selector[0], listOpts.limit, listOpts.offset, listOpts.reverse, listOpts.include)
		if err != nil {
			log.Fatal(err)
		}

		switch listOpts.output {

		// render as table
		case "table":
			t := table.NewWriter()
			t.SetOutputMirror(os.Stdout)
			t.Style().Options.DrawBorder = false
			t.Style().Options.SeparateColumns = false
			t.Style().Options.SeparateHeader = false

			t.SetTitle(home.Name())

			// format selector path
			pathArray := strings.Split(path, "<")
			// reverse path
			for i, j := 0, len(pathArray)-1; i < j; i, j = i+1, j-1 {
				pathArray[i], pathArray[j] = pathArray[j], pathArray[i]
			}
			pathFormatted := strings.Join(pathArray, ">")

			t.AppendHeader(table.Row{"#", "Name", fmt.Sprintf("Url [%s]", pathFormatted)})

			for index, link := range links {
				u, err := base.Parse(link.Href)
				if err != nil {
					log.Fatal(err)
				}

				t.AppendRow([]interface{}{index + 1, link.Text, u.String()})
			}

			t.Render()

		// render as json
		case "json":
			book := make(map[string]interface{})
			book["name"] = home.Name()
			book["chapters"] = links

			bookJson, err := json.Marshal(book)
			if err != nil {
				log.Fatal(err)
			}

			fmt.Println(string(bookJson))
		}

	},
}