package sneklog

// Predefined log levels.
var (
	INFO  = NewInfoLogLevelWithColors("info", FgWhite, BgNone)
	WARN  = NewWarnLogLevelWithColors("warn", FgHiYellow, BgNone)
	ERROR = NewErrorLogLevelWithColors("error", FgHiRed, BgNone)
	FATAL = NewFatalLogLevelWithColors("fatal", FgRed, BgNone)
	DEBUG = NewDebugLogLevelWithColors("debug", FgGreen, BgNone)
)

// LogLevel describes a logging severity.
type LogLevel struct {
	n uint8
	t string

	fg    FgColor
	fg256 FgColor256
	fgRgb FgColorRGB

	bg    BgColor
	bg256 BgColor256
	bgRgb BgColorRGB

	attrs []Attribute
}

// NewLogLevel creates a log level without predefined colors.
func NewLogLevel(index uint8, name string) LogLevel {
	return NewLogLevelWithColors(index, name, 0, 0)
}

// NewLogLevelWithColors creates a log level with ANSI foreground and background colors.
func NewLogLevelWithColors(index uint8, name string, fg FgColor, bg BgColor) LogLevel {
	return LogLevel{n: index, t: name, fg: fg, bg: bg, attrs: []Attribute{}}
}

// NewInfoLogLevel creates an info-level log level without predefined colors.
func NewInfoLogLevel(name string) LogLevel { return NewLogLevel(0, name) }

// NewInfoLogLevelWithColors creates an info-level log level with ANSI colors.
func NewInfoLogLevelWithColors(name string, fg FgColor, bg BgColor) LogLevel {
	return NewLogLevelWithColors(0, name, fg, bg)
}

// NewWarnLogLevel creates a warn-level log level without predefined colors.
func NewWarnLogLevel(name string) LogLevel { return NewLogLevel(1, name) }

// NewWarnLogLevelWithColors creates a warn-level log level with ANSI colors.
func NewWarnLogLevelWithColors(name string, fg FgColor, bg BgColor) LogLevel {
	return NewLogLevelWithColors(1, name, fg, bg)
}

// NewErrorLogLevel creates an error-level log level without predefined colors.
func NewErrorLogLevel(name string) LogLevel { return NewLogLevel(2, name) }

// NewErrorLogLevelWithColors creates an error-level log level with ANSI colors.
func NewErrorLogLevelWithColors(name string, fg FgColor, bg BgColor) LogLevel {
	return NewLogLevelWithColors(2, name, fg, bg)
}

// NewFatalLogLevel creates a fatal-level log level without predefined colors.
func NewFatalLogLevel(name string) LogLevel { return NewLogLevel(3, name) }

// NewFatalLogLevelWithColors creates a fatal-level log level with ANSI colors.
func NewFatalLogLevelWithColors(name string, fg FgColor, bg BgColor) LogLevel {
	return NewLogLevelWithColors(3, name, fg, bg)
}

// NewDebugLogLevel creates a debug-level log level without predefined colors.
func NewDebugLogLevel(name string) LogLevel { return NewLogLevel(4, name) }

// NewDebugLogLevelWithColors creates a debug-level log level with ANSI colors.
func NewDebugLogLevelWithColors(name string, fg FgColor, bg BgColor) LogLevel {
	return NewLogLevelWithColors(4, name, fg, bg)
}

// GetName returns the lowercase textual representation of the level.
func (l *LogLevel) GetName() string { return l.t }

// SetFgColor sets the ANSI foreground color and clears other foreground color modes.
// Deprecated: use SetForegroundColor. This method will be removed in v3.
func (l *LogLevel) SetFgColor(color FgColor) *LogLevel {
	return l.SetForegroundColor(color)
}

// GetFgColor returns the ANSI foreground color for the level.
// Deprecated: use GetForegroundColor. This method will be removed in v3.
func (l *LogLevel) GetFgColor() FgColor { return l.GetForegroundColor() }

// SetForegroundColor sets the ANSI foreground color and clears other foreground color modes.
func (l *LogLevel) SetForegroundColor(color FgColor) *LogLevel {
	l.fg = color
	l.fg256 = 0
	l.fgRgb = nil
	return l
}

// GetForegroundColor returns the ANSI foreground color for the level.
func (l *LogLevel) GetForegroundColor() FgColor { return l.fg }

// SetForeground256Color sets the 256-color foreground and clears other foreground color modes.
func (l *LogLevel) SetForeground256Color(color FgColor256) *LogLevel {
	l.fg = 0
	l.fg256 = color
	l.fgRgb = nil
	return l
}

// GetForeground256Color returns the configured 256-color foreground value.
func (l *LogLevel) GetForeground256Color() FgColor256 { return l.fg256 }

// SetForegroundRGB sets the RGB foreground color and clears other foreground color modes.
func (l *LogLevel) SetForegroundRGB(r, g, b uint8) *LogLevel {
	l.fg = 0
	l.fg256 = 0
	l.fgRgb = FgColorRGB{r, g, b}
	return l
}

// GetForegroundRGB returns the configured RGB foreground value.
func (l *LogLevel) GetForegroundRGB() FgColorRGB { return l.fgRgb }

// SetBgColor sets the ANSI background color and clears other background color modes.
// Deprecated: use SetBackgroundColor. This method will be removed in v3.
func (l *LogLevel) SetBgColor(color BgColor) *LogLevel {
	return l.SetBackgroundColor(color)
}

// GetBgColor returns the ANSI background color for the level.
// Deprecated: use GetBackgroundColor. This method will be removed in v3.
func (l *LogLevel) GetBgColor() BgColor { return l.GetBackgroundColor() }

// SetBackgroundColor sets the ANSI background color and clears other background color modes.
func (l *LogLevel) SetBackgroundColor(color BgColor) *LogLevel {
	l.bg = color
	l.bg256 = 0
	l.bgRgb = nil
	return l
}

// GetBackgroundColor returns the ANSI background color for the level.
func (l *LogLevel) GetBackgroundColor() BgColor { return l.bg }

// SetBackground256Color sets the 256-color background and clears other background color modes.
func (l *LogLevel) SetBackground256Color(color BgColor256) *LogLevel {
	l.bg = 0
	l.bg256 = color
	l.bgRgb = nil
	return l
}

// GetBackground256Color returns the configured 256-color background value.
func (l *LogLevel) GetBackground256Color() BgColor256 { return l.bg256 }

// SetBackgroundRGB sets the RGB background color and clears other background color modes.
func (l *LogLevel) SetBackgroundRGB(r, g, b uint8) *LogLevel {
	l.bg = 0
	l.bg256 = 0
	l.bgRgb = BgColorRGB{r, g, b}
	return l
}

// GetBackgroundRGB returns the configured RGB background value.
func (l *LogLevel) GetBackgroundRGB() BgColorRGB { return l.bgRgb }

// AddAttribute appends an ANSI text attribute to the level.
func (l *LogLevel) AddAttribute(a Attribute) *LogLevel {
	l.attrs = append(l.attrs, a)
	return l
}

// RemoveAttribute removes all matching ANSI text attributes from the level.
func (l *LogLevel) RemoveAttribute(a Attribute) *LogLevel {
	attrs := make([]Attribute, 0)
	for _, attr := range l.attrs {
		if attr != a {
			attrs = append(attrs, attr)
		}
	}
	l.attrs = attrs
	return l
}

// SetAttributes replaces the level attributes with a copy of the provided slice.
func (l *LogLevel) SetAttributes(a []Attribute) *LogLevel {
	attrs := make([]Attribute, len(a))
	copy(attrs, a)
	l.attrs = attrs
	return l
}

// GetAttributes returns a copy of the configured ANSI text attributes.
func (l *LogLevel) GetAttributes() []Attribute {
	attrs := make([]Attribute, len(l.attrs))
	copy(attrs, l.attrs)
	return attrs
}

// SameLevel reports whether two log levels have the same severity index.
func (l *LogLevel) SameLevel(other LogLevel) bool {
	return l.n == other.n
}

// Equal reports whether two log levels have identical configuration.
func (l *LogLevel) Equal(other LogLevel) bool {
	if l.t != other.t || l.n != other.n {
		return false
	}
	if l.fg != other.fg || l.bg != other.bg {
		return false
	}

	if l.fg256 != other.fg256 || l.bg256 != other.bg256 {
		return false
	}

	if len(l.attrs) != len(other.attrs) {
		return false
	}
	for i := range l.attrs {
		if l.attrs[i] != other.attrs[i] {
			return false
		}
	}

	if len(l.fgRgb) != len(other.fgRgb) {
		return false
	}
	for i := range l.fgRgb {
		if l.fgRgb[i] != other.fgRgb[i] {
			return false
		}
	}

	if len(l.bgRgb) != len(other.bgRgb) {
		return false
	}
	for i := range l.bgRgb {
		if l.bgRgb[i] != other.bgRgb[i] {
			return false
		}
	}
	return true
}