package common

import (
	"errors"
	"fmt"
	"os"
	"strconv"
	"strings"
)

type JobVariable struct {
	Key      string `json:"key"`
	Value    string `json:"value"`
	Public   bool   `json:"public"`
	Internal bool   `json:"-"`
	File     bool   `json:"file"`
	Masked   bool   `json:"masked"`
	Raw      bool   `json:"raw"`
}

type JobVariables []JobVariable

func (b JobVariable) String() string {
	return fmt.Sprintf("%s=%s", b.Key, b.Value)
}

func (b JobVariables) PublicOrInternal() (variables JobVariables) {
	for _, variable := range b {
		if variable.Public || variable.Internal {
			variables = append(variables, variable)
		}
	}
	return variables
}

func (b JobVariables) StringList() (variables []string) {
	for _, variable := range b {
		variables = append(variables, variable.String())
	}
	return variables
}

func (b JobVariables) Get(key string) string {
	switch key {
	case "$":
		return key
	case "*", "#", "@", "!", "?", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9":
		return ""
	}
	for i := len(b) - 1; i >= 0; i-- {
		if b[i].Key == key {
			return b[i].Value
		}
	}
	return ""
}

// Bool tries to get the boolean value of a variable
// "true" and "false" strings are parsed as well as numeric values
// where only the value of "1" is considered to be true
func (b JobVariables) Bool(key string) bool {
	value := b.Get(key)
	parsedBool, err := strconv.ParseBool(strings.ToLower(value))
	if err == nil {
		return parsedBool
	}

	parsedInt, err := strconv.ParseInt(value, 10, 32)
	if err == nil {
		return parsedInt == 1
	}

	return false
}

// OverwriteKey overwrites an existing key with a new variable.
func (b JobVariables) OverwriteKey(key string, variable JobVariable) {
	for i, v := range b {
		if v.Key == key {
			b[i] = variable
			return
		}
	}
}

func (b JobVariables) ExpandValue(value string) string {
	return os.Expand(value, b.Get)
}

func (b JobVariables) Expand() JobVariables {
	var variables JobVariables
	for _, variable := range b {
		if !variable.Raw {
			variable.Value = b.ExpandValue(variable.Value)
		}

		variables = append(variables, variable)
	}
	return variables
}

func (b JobVariables) Masked() (masked []string) {
	for _, variable := range b {
		if variable.Masked {
			masked = append(masked, variable.Value)
		}
	}
	return
}

func ParseVariable(text string) (variable JobVariable, err error) {
	keyValue := strings.SplitN(text, "=", 2)
	if len(keyValue) != 2 {
		err = errors.New("missing =")
		return
	}
	variable = JobVariable{
		Key:   keyValue[0],
		Value: keyValue[1],
	}
	return
}
