package hackers_git

import (
	"fmt"
	yaml "gopkg.in/yaml.v2"
	"io/ioutil"
	"os"
	"path"
	"sd_daemon/logger"
	"strconv"
	"strings"
)

func filename2uid(filename string) int32 {
	basename := path.Base(filename)
	parts := strings.SplitN(basename, ".", 2)
	if len(parts) != 2 || parts[1] != "yml" {
		return -1
	}
	uid, err := strconv.ParseInt(parts[0], 10, 32)
	if err != nil {
		return -1
	}
	return int32(uid)
}

var usersGid = name2gid("users")

func parse_user_yaml(filename string) (ret user, err error) {
	ret.passwd.UID = filename2uid(filename)

	if ret.passwd.UID < 0 {
		err = fmt.Errorf("Invalid user filename: %q", filename)
		return
	}
	file, err := os.Open(filename)
	if err != nil {
		return
	}
	contents, err := ioutil.ReadAll(file)
	if err != nil {
		return
	}
	var _data interface{}
	err = yaml.Unmarshal(contents, &_data)
	if err != nil {
		return
	}
	data, isMap := _data.(map[interface{}]interface{})
	errs := []string{}
	if !isMap {
		errs = append(errs, "root node is not a map")
	} else {
		if iface, isSet := data["username"]; !isSet {
			errs = append(errs, "\"username\" is not set")
		} else if str, isTyp := iface.(string); !isTyp {
			errs = append(errs, "\"username\" is not a string")
		} else {
			ret.passwd.Name = str
			ret.passwd.HomeDir = "/home/" + str
		}

		if iface, isSet := data["fullname"]; !isSet {
			errs = append(errs, "\"fullname\" is not set")
		} else if str, isTyp := iface.(string); !isTyp {
			errs = append(errs, "\"fullname\" is not a string")
		} else {
			ret.passwd.GECOS = str
		}

		if iface, isSet := data["shell"]; !isSet {
			errs = append(errs, "\"shell\" is not set")
		} else if str, isTyp := iface.(string); !isTyp {
			errs = append(errs, "\"shell\" is not a string")
		} else {
			ret.passwd.Shell = str
		}

		if iface, isSet := data["groups"]; !isSet {
			ret.groups = make(map[string]bool, 0)
		} else if ary, isTyp := iface.([]interface{}); !isTyp {
			errs = append(errs, "\"groups\" is not an array")
		} else {
			groups := make(map[string]bool, len(ary))
			e := false
			for _, iface := range ary {
				if str, isTyp := iface.(string); !isTyp {
					errs = append(errs, "\"group\" item is not an array")
					e = true
					break
				} else {
					groups[str] = true
				}
			}
			if !e {
				ret.groups = groups
			}
		}
	}
	if len(errs) > 0 {
		err = &yaml.TypeError{Errors: errs}
	}

	ret.passwd.PwHash = "!"
	ret.passwd.GID = usersGid

	return
}

func parse_user_password(filename string) (hash string) {
	hash = "!"
	file, err := os.Open(filename)
	if err != nil {
		logger.Debug("hackers.git: %v", err)
		return
	}
	contents, err := ioutil.ReadAll(file)
	if err != nil {
		logger.Debug("hackers.git: Error while reading: %q: %v", filename, err)
		return
	}
	lines := strings.Split(string(contents), "\n")
	switch len(lines) {
	case 1:
		hash = lines[0]
	case 2:
		if lines[1] == "" {
			hash = lines[0]
		} else {
			logger.Debug("hackers.git: Invalid password format in file: %q", filename)
		}
	default:
		logger.Debug("hackers.git: Invalid password format in file: %q", filename)
	}
	return
}