package args

import (
	"strings"

	"github.com/spf13/pflag"
	"mvdan.cc/sh/v3/syntax"

	"github.com/go-task/task/v3"
	"github.com/go-task/task/v3/taskfile/ast"
)

// Get fetches the remaining arguments after CLI parsing and splits them into
// two groups: the arguments before the double dash (--) and the arguments after
// the double dash.
func Get() ([]string, []string, error) {
	args := pflag.Args()
	doubleDashPos := pflag.CommandLine.ArgsLenAtDash()

	if doubleDashPos == -1 {
		return args, nil, nil
	}

	var quotedCliArgs []string
	for _, arg := range args[doubleDashPos:] {
		quotedCliArg, err := syntax.Quote(arg, syntax.LangBash)
		if err != nil {
			return nil, nil, err
		}
		quotedCliArgs = append(quotedCliArgs, quotedCliArg)
	}

	return args[:doubleDashPos], quotedCliArgs, nil
}

// Parse parses command line argument: tasks and global variables
func Parse(args ...string) ([]*task.Call, *ast.Vars) {
	calls := []*task.Call{}
	globals := ast.NewVars()

	for _, arg := range args {
		if !strings.Contains(arg, "=") {
			calls = append(calls, &task.Call{Task: arg})
			continue
		}

		name, value := splitVar(arg)
		globals.Set(name, ast.Var{Value: value})
	}

	return calls, globals
}

func splitVar(s string) (string, string) {
	pair := strings.SplitN(s, "=", 2)
	return pair[0], pair[1]
}