package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"os"
	"strconv"
	"strings"
)

type Config struct {
	Method       string `json:method`
	OutputDir    string `json:outputdir`
	InputDir     string `json:inputdir`
	BaseImage    string `json:baseimage`
	Dimensions   string `json:dimensions`
	OutputWidth  int    `json:output_width`
	OutputHeight int    `json:output_height`
	Grayscale    bool
	Sepia        bool
	Amount       int
	Quiet        bool
}

// loads configuration values from json file
func (c *Config) LoadConfigFromFile(filePath string) {
	file, _ := os.Open("conf.json")
	defer file.Close()
	decoder := json.NewDecoder(file)
	configuration := Config{}
	err := decoder.Decode(&configuration)
	if err != nil {
		fmt.Println("error:", err)
	}
	fmt.Println(configuration.Method)
	fmt.Println(configuration.OutputDir)
}

// Set output file dimensions using string symbol (<width>x<height>)
func (c *Config) SetOutputDimensions() {
	split := strings.Split(c.Dimensions, "x")
	width, _ := strconv.Atoi(split[0])
	height, _ := strconv.Atoi(split[1])
	c.OutputWidth = width
	c.OutputHeight = height
}

func initConfigRegister() {
	// command line arguments
	flag.StringVar(&ConfigRegister.Method, "blending", "darken", "Blending methods : darken, lighten, average, fuckyfun")
	flag.StringVar(&ConfigRegister.OutputDir, "output", "./", "Output directory")
	flag.StringVar(&ConfigRegister.InputDir, "input", "/home/gator/Photos", "Input directory. Where to look the images from")
	flag.StringVar(&ConfigRegister.BaseImage, "base-img", "", "Path to the base image to work with. Random image if not set")
	flag.StringVar(&ConfigRegister.Dimensions, "dimensions", "1280x1024", "Out image dimensions. <width>x<height>")
	flag.BoolVar(&ConfigRegister.Grayscale, "grayscale", false, "Output image in shade of gray (around 50)")
	flag.BoolVar(&ConfigRegister.Sepia, "sepia", false, "Output image with sepia tone")
	flag.IntVar(&ConfigRegister.Amount, "amount", 2, "Number of images to blend together")
	flag.BoolVar(&ConfigRegister.Quiet, "quiet", false, "No progress messages")
	flag.Parse()

	// set output's width and height
	ConfigRegister.SetOutputDimensions()
}

// global register to acccess configuration values
var ConfigRegister Config