package doc

import (
	"bytes"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"sort"
	"strings"
	"time"

	"github.com/spf13/cobra"
)

func printOptionsAsciidoc(buf *bytes.Buffer, cmd *cobra.Command, name string) error {
	flags := cmd.NonInheritedFlags()
	flags.SetOutput(buf)
	if flags.HasAvailableFlags() {
		buf.WriteString("== Options\n")
		buf.WriteString("\n")
		buf.WriteString(".Options\n")
		buf.WriteString("[source,text]\n----\n")
		flags.PrintDefaults()
		buf.WriteString("----\n\n")
	}

	parentFlags := cmd.InheritedFlags()
	parentFlags.SetOutput(buf)
	if parentFlags.HasAvailableFlags() {
		buf.WriteString("== Options inherited from parent commands\n\n")
		buf.WriteString(".Parent Options\n")
		buf.WriteString("[source,text]\n----\n")
		parentFlags.PrintDefaults()
		buf.WriteString("----\n\n")
	}
	return nil
}

// GenAsciidoc creates Asciidoc output.
func GenAsciidoc(cmd *cobra.Command, w io.Writer) error {
	return GenAsciidocCustom(cmd, w, func(s string) string { return s })
}

// GenAsciidocCustom creates custom Asciidoc output.
func GenAsciidocCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string) string) error {
	cmd.InitDefaultHelpCmd()
	cmd.InitDefaultHelpFlag()

	buf := new(bytes.Buffer)
	name := cmd.CommandPath()
	splitName := strings.Split(cmd.CommandPath(), " ")

	if len(splitName) < 2 {
		buf.WriteString("= " + name + "\n\n")
	} else {
		buf.WriteString("= " + splitName[0] + ":")
		for index, cmdName := range splitName {
			if index < 1 {
				// Skip the root name.
				continue
			}
			buf.WriteString(" " + cmdName)
		}
		buf.WriteString("\n\n")
	}
	// No point in printing the description if it's empty.
	if len(cmd.Short) > 0 {
		buf.WriteString("[.lead]\n")
		buf.WriteString(cmd.Short + "\n\n")
	}

	if len(cmd.Long) > 0 {
		buf.WriteString("== Synopsis\n\n")
		buf.WriteString(cmd.Long + "\n\n")
	}

	if cmd.Runnable() {
		buf.WriteString(fmt.Sprintf("[source,text]\n"))
		buf.WriteString(fmt.Sprintf("----\n%s\n----\n\n", cmd.UseLine()))
	}

	if len(cmd.Example) > 0 {
		buf.WriteString("== Examples\n\n")
		buf.WriteString(".Examples Options\n")
		buf.WriteString("[source,text]\n")
		buf.WriteString(fmt.Sprintf("----\n%s\n----\n\n", cmd.Example))
	}

	if err := printOptionsAsciidoc(buf, cmd, name); err != nil {
		return err
	}
	if hasSeeAlso(cmd) {
		buf.WriteString(fmt.Sprintf("== SEE ALSO\n\n"))
		if cmd.HasParent() {
			parent := cmd.Parent()
			pname := parent.CommandPath()
			link := pname + ".adoc"
			link = strings.ReplaceAll(link, " ", "_")
			buf.WriteString(fmt.Sprintf("* xref:%s[%s]\t - %s\n", linkHandler(link), pname, parent.Short))
			cmd.VisitParents(func(c *cobra.Command) {
				if c.DisableAutoGenTag {
					cmd.DisableAutoGenTag = c.DisableAutoGenTag
				}
			})
		}

		children := cmd.Commands()
		sort.Sort(byName(children))

		for _, child := range children {
			if !child.IsAvailableCommand() || child.IsAdditionalHelpTopicCommand() {
				continue
			}
			cname := name + " " + child.Name()
			link := cname + ".adoc"
			link = strings.ReplaceAll(link, " ", "_")
			buf.WriteString(fmt.Sprintf("* xref:%s[%s]\t - %s\n", linkHandler(link), cname, child.Short))
		}
		buf.WriteString("\n")
	}
	if !cmd.DisableAutoGenTag {

		buf.WriteString("\n.Last Generated\n")
		buf.WriteString("****\n")
		buf.WriteString("Auto generated by spf13/cobra on " + time.Now().Format("2-Jan-2006") + "\n")
		buf.WriteString("****\n")
	}
	_, err := buf.WriteTo(w)
	return err
}

// GenAsciidocTree will generate a Asciidoc page for this command and all
// descendants in the directory given. The header may be nil.
// This function may not work correctly if your command names have `-` in them.
// If you have `cmd` with two subcmds, `sub` and `sub-third`,
// and `sub` has a subcommand called `third`, it is undefined which
// help output will be in the file `cmd-sub-third.1`.
func GenAsciidocTree(cmd *cobra.Command, dir string) error {
	identity := func(s string) string { return s }
	emptyStr := func(s string) string { return "" }
	return GenAsciidocTreeCustom(cmd, dir, emptyStr, identity)
}

// GenAsciidocTreeCustom is the the same as GenAsciidocTree, but
// with custom filePrepender and linkHandler.
func GenAsciidocTreeCustom(cmd *cobra.Command, dir string, filePrepender, linkHandler func(string) string) error {
	for _, c := range cmd.Commands() {
		if !c.IsAvailableCommand() || c.IsAdditionalHelpTopicCommand() {
			continue
		}
		if err := GenAsciidocTreeCustom(c, dir, filePrepender, linkHandler); err != nil {
			return err
		}
	}

	basename := strings.ReplaceAll(cmd.CommandPath(), " ", "_") + ".adoc"
	filename := filepath.Join(dir, basename)
	f, err := os.Create(filename)
	if err != nil {
		return err
	}
	defer f.Close()

	if _, err := io.WriteString(f, filePrepender(filename)); err != nil {
		return err
	}
	if err := GenAsciidocCustom(cmd, f, linkHandler); err != nil {
		return err
	}
	return nil
}