package docconv

import (
	"fmt"
	"io"
	"os/exec"
	"strings"
	"time"
)

// ConvertRTF converts RTF files to text.
func ConvertRTF(r io.Reader) (string, map[string]string, error) {
	f, err := NewLocalFile(r)
	if err != nil {
		return "", nil, fmt.Errorf("error creating local file: %v", err)
	}
	defer f.Done()

	var output string
	tmpOutput, err := exec.Command("unrtf", "--nopict", "--text", f.Name()).Output()
	if err != nil {
		return "", nil, fmt.Errorf("unrtf error: %v", err)
	}

	// Step through content looking for meta data and stripping out comments
	meta := make(map[string]string)
	for _, line := range strings.Split(string(tmpOutput), "\n") {
		if parts := strings.SplitN(line, ":", 2); len(parts) > 1 {
			meta[strings.TrimSpace(parts[0])] = strings.TrimSpace(parts[1])
		}
		if !strings.HasPrefix(line, "### ") {
			output += line + "\n"
		}
	}

	// Identify meta data
	if tmp, ok := meta["AUTHOR"]; ok {
		meta["Author"] = tmp
	}
	if tmp, ok := meta["### creation date"]; ok {
		if t, err := time.Parse("02 January 2006 15:04", tmp); err == nil {
			meta["CreatedDate"] = fmt.Sprintf("%d", t.Unix())
		}
	}
	if tmp, ok := meta["### revision date"]; ok {
		if t, err := time.Parse("02 January 2006 15:04", tmp); err == nil {
			meta["ModifiedDate"] = fmt.Sprintf("%d", t.Unix())
		}
	}

	return output, meta, nil
}