package stone

import "os"
import "bufio"
import "strings"
import "strconv"
import "image/color"
import "path/filepath"

// Config stores configuration parameters. Backends only should honor parameters
// that they can support.
type Config struct {
	colors   [8]color.Color
	padding  int
	center   bool
	fontSize int
	fontName string
}

// Color returns the color value at the specified index.
func (config *Config) Color (index Color) (value color.Color) {
	value = config.colors[index]
	return
}

// Padding specifies how many cell's worth of padding should be on all sides of
// the buffer.
func (config *Config) Padding () (padding int) {
	padding = config.padding
	return
}

// Center returns whether the buffer should be displayed in the center of the
// window like in kitty, or aligned to one corner like in gnome-terminal.
func (config *Config) Center () (center bool) {
	center = config.center
	return
}

// FontSize specifies how big the font should be.
func (config *Config) FontSize () (fontSize int) {
	fontSize = config.fontSize
	return
}

// FontName specifies the name of the font to use.
func (config *Config) FontName () (fontName string) {
	fontName = config.fontName
	return
}

func (config *Config) load () {
	config.colors = [8]color.Color {
		// background
		color.RGBA { R: 0, G: 0, B: 0, A: 0 },
		// foreground
		color.RGBA { R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF },
		// dim
		color.RGBA { R: 0x80, G: 0x80, B: 0x80, A: 0xFF },
		// red
		color.RGBA { R: 0xFF, G: 0x00, B: 0x00, A: 0xFF },
		// yellow
		color.RGBA { R: 0xFF, G: 0xFF, B: 0x00, A: 0xFF },
		// green
		color.RGBA { R: 0x00, G: 0xFF, B: 0x00, A: 0xFF },
		// blue
		color.RGBA { R: 0x00, G: 0x80, B: 0xFF, A: 0xFF },
		// purple
		color.RGBA { R: 0x80, G: 0x40, B: 0xFF, A: 0xFF },
	}
	config.fontName = ""
	config.fontSize = 11
	config.padding = 2

	config.loadFile("/etc/stone/stone.conf")
	homeDirectory, err := os.UserHomeDir()
	if err != nil { return }
	config.loadFile(filepath.Join(homeDirectory, "/.config/stone/stone.conf"))
	
	return
}

func (config *Config) loadFile (path string) {
	file, err := os.Open(path)
	if err != nil { return }

	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		
		if len(line) == 0 {
			continue
		}

		if line[0] == '#' {
			continue
		}
	
		key, value, found := strings.Cut(scanner.Text(), ":")
		if !found {
			println (
				"config: error in file", path +
				": key-value separator missing")
			println(scanner.Text())
			continue
		}
		key   = strings.TrimSpace(key)
		value = strings.TrimSpace(value)

		var valueInt int
		var valueColor color.Color
		var valueBoolean bool
		
		if value == "true" {
			valueBoolean = true
		}

		if value[0] == '#' {
			if len(value) != 7  {
				println (
					"config: error in file", path +
					": malformed color literal")
				continue
			}

			colorInt, err := strconv.ParseUint(value[1:7], 16, 24)
			if err != nil  {
				println (
					"config: error in file", path +
					": malformed color literal")
				continue
			}

			valueColor = color.RGBA {
				R: uint8(colorInt >> 16),
				G: uint8(colorInt >> 8),
				B: uint8(colorInt),
				A: 0xFF,
			}
		} else {
			valueInt, _ = strconv.Atoi(value)
		}

		switch key {
		case "fontNormal":
			config.fontName = value
		case "fontSize":
			config.fontSize = valueInt
		case "padding":
			config.padding = valueInt
		case "center":
			config.center = valueBoolean
		case "colorBackground":
			config.colors[ColorBackground] = valueColor
		case "colorForeground":
			config.colors[ColorForeground] = valueColor
		case "colorDim":
			config.colors[ColorDim] = valueColor
		case "colorRed":
			config.colors[ColorRed] = valueColor
		case "colorYellow":
			config.colors[ColorYellow] = valueColor
		case "colorGreen":
			config.colors[ColorGreen] = valueColor
		case "colorBlue":
			config.colors[ColorBlue] = valueColor
		case "colorPurple":
			config.colors[ColorPurple] = valueColor
		}
	}
}