package main

import (
	"fmt"
	"strings"

	"github.com/spf13/cobra"
	intrgb "netdome.biz/paul/qmk-rgb/internal/rgb"
)

func NewColorCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "color <hex>|rgb:<hex>|hsv:<h>,<s>,<v>",
		Short: "Set RGB color",
		Long: "Set the color of the selected zones from one of three notations:\n" +
			"  ff0000          six digit hex, hue and saturation only\n" +
			"  rgb:ff0000      the same, written out\n" +
			"  hsv:0,255,255   hue, saturation and value, each 0-255\n" +
			"\n" +
			"The hex notations say nothing about brightness, so they leave it alone.\n" +
			"The keyboard has no value register for a color: the value of an hsv:\n" +
			"notation is written to the brightness of the same zones, and the\n" +
			"brightness the keyboard ended up holding is reported.\n" +
			"\n" +
			"Every notation is read back, so a color the keyboard rounded or refused\n" +
			"is reported instead of being claimed as set.",
		Args: cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			spec, err := intrgb.ParseColorSpec(args[0])
			if err != nil {
				return err
			}

			proto, target, channels, err := openTarget()
			if err != nil {
				return err
			}
			defer proto.Close()

			colors, err := setColorVerified(proto, channels, target.Display, spec.H, spec.S)
			if err != nil {
				return fmt.Errorf("set color: %w", err)
			}

			if !spec.HasValue() {
				printColorResult(cmd, colors, nil)
				return nil
			}

			brightness, err := setBrightnessVerified(proto, channels, target.Display, spec.V)
			if err != nil {
				return fmt.Errorf("set brightness from %s: %w", args[0], err)
			}

			printColorResult(cmd, colors, brightness)
			return nil
		},
	}
}

// printColorResult states the color every zone actually holds. The brightness
// results are nil for a notation that did not write one, and then no brightness
// is mentioned: the command must not imply it set something it left alone.
func printColorResult(cmd *cobra.Command, colors []colorResult, brightness []zoneResult) {
	request := ""
	if len(colors) > 0 {
		request = fmt.Sprintf("hue %d sat %d", colors[0].RequestedHue, colors[0].RequestedSaturation)
		if len(brightness) > 0 {
			request += fmt.Sprintf(" brightness %d", brightness[0].Requested)
		}
	}

	if !anyColorMismatch(colors) && !anyMismatch(brightness) {
		fmt.Fprintf(cmd.OutOrStdout(), "Color set to %s\n", request)
		return
	}

	var b strings.Builder
	b.WriteString("Color")
	for i, c := range colors {
		fmt.Fprintf(&b, " %s hue %d sat %d", c.Name, c.Hue, c.Saturation)
		if i < len(brightness) {
			fmt.Fprintf(&b, " brightness %d", brightness[i].Applied)
		}
	}
	fmt.Fprintf(&b, " (requested %s)", request)
	fmt.Fprintln(cmd.OutOrStdout(), b.String())
}

// anyColorMismatch reports whether any zone stored another color.
func anyColorMismatch(results []colorResult) bool {
	for _, r := range results {
		if r.Mismatch() {
			return true
		}
	}
	return false
}