package cmd

import (
	"github.com/spf13/cobra"
)

func init() {
	// File extension hints for positional args

	convertCmd.ValidArgsFunction = completeMarkdownFiles
	embedCmd.ValidArgsFunction = completeMarkdownFiles
	fmtCmd.ValidArgsFunction = completeXMLFiles
	extractCmd.ValidArgsFunction = completeXMLFiles
	pullCmd.ValidArgsFunction = cobra.NoFileCompletions
	pushCmd.ValidArgsFunction = completePushArgs

	// Flag file completions
	_ = convertCmd.RegisterFlagCompletionFunc("output", completeXMLFilesFlag)
	_ = embedCmd.RegisterFlagCompletionFunc("output", completeXMLFilesFlag)
	_ = embedCmd.RegisterFlagCompletionFunc("template", completeXMLFilesFlag)
	_ = extractCmd.RegisterFlagCompletionFunc("output", completeMarkdownFilesFlag)
	_ = fmtCmd.RegisterFlagCompletionFunc("output", completeXMLFilesFlag)
	_ = pullCmd.RegisterFlagCompletionFunc("output", completeMarkdownFilesFlag)

	// Marker flag completions
	for _, cmd := range []*cobra.Command{embedCmd, extractCmd, pushCmd} {
		_ = cmd.RegisterFlagCompletionFunc("marker-start", cobra.NoFileCompletions)
		_ = cmd.RegisterFlagCompletionFunc("marker-end", cobra.NoFileCompletions)
	}
}

func completeMarkdownFiles(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return []string{"md"}, cobra.ShellCompDirectiveFilterFileExt
}

func completeXMLFiles(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return []string{"xml"}, cobra.ShellCompDirectiveFilterFileExt
}

func completePushArgs(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	if len(args) == 0 {
		// First arg is URL — no file completion
		return nil, cobra.ShellCompDirectiveNoFileComp
	}
	// Second arg is input file
	return []string{"md"}, cobra.ShellCompDirectiveFilterFileExt
}

func completeMarkdownFilesFlag(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return []string{"md"}, cobra.ShellCompDirectiveFilterFileExt
}

func completeXMLFilesFlag(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return []string{"xml"}, cobra.ShellCompDirectiveFilterFileExt
}