#!/bin/bash

# 检查参数个数
if [ $# -ne 4 ]; then
    echo "Usage: $0 <0-2> <0-4095> <0-4095> <0-4095>"
    exit 1
fi

# 赋值参数
# bus 0-/dev/i2c-0	1-/dev/i2c-1
bus=0

# param1 0-第0个LED	1-第1个LED	2-第2个LED
param1=$1

# param2 red
param2=$2
param2=$((4095 - ${param2}))

# param3 green
param3=$3
param3=$((4095 - ${param3}))

# param4 blue
param4=$4
param4=$((4095 - ${param4}))

# 验证第一个参数范围 0-2
if ! [[ "$param1" =~ ^[0-2]$ ]]; then
    echo "Error: First parameter must be 0, 1, or 2"
    exit 1
fi

# 验证后面三个参数范围 0-4095
for i in 2 3 4; do
    val=${!i}
    if ! [[ "$val" =~ ^[0-9]+$ ]] || [ "$val" -lt 0 ] || [ "$val" -gt 4095 ]; then
        echo "Error: Parameter $i must be an integer between 0 and 4095"
        exit 1
    fi
done

# 拆分函数：将 0-4095 的值拆成两个字节（高8位和低8位）
split_into_bytes() {
    local value=$1
    local high_byte=$(( (value >> 8) & 0xFF ))
    local low_byte=$(( value & 0xFF ))
    echo "$high_byte $low_byte"
}

read high1 low1 <<< $(split_into_bytes $param2)
read high2 low2 <<< $(split_into_bytes $param3)
read high3 low3 <<< $(split_into_bytes $param4)

echo "param1:${param1}"
echo "high1:${high1} low1:${low1}"
echo "high1:${high2} low1:${low2}"
echo "high1:${high3} low1:${low3}"


reg_06=$((0x06 + ${param1} * 12))
reg_07=$((0x07 + ${param1} * 12))
reg_08=$((0x08 + ${param1} * 12))
reg_09=$((0x09 + ${param1} * 12))
reg_0a=$((0x0a + ${param1} * 12))
reg_0b=$((0x0b + ${param1} * 12))
reg_0c=$((0x0c + ${param1} * 12))
reg_0d=$((0x0d + ${param1} * 12))
reg_0e=$((0x0e + ${param1} * 12))
reg_0f=$((0x0f + ${param1} * 12))
reg_10=$((0x10 + ${param1} * 12))
reg_11=$((0x11 + ${param1} * 12))

# echo "${reg_06} ${reg_07} ${reg_08} ${reg_09} ${reg_0a} ${reg_0b} ${reg_0c} ${reg_0d} ${reg_0e} ${reg_0f} ${reg_10} ${reg_11} "

i2cset -y ${bus} 0x40 $reg_06 0
i2cset -y ${bus} 0x40 $reg_07 0
i2cset -y ${bus} 0x40 $reg_08 $low1
i2cset -y ${bus} 0x40 $reg_09 $high1
i2cset -y ${bus} 0x40 $reg_0a 0
i2cset -y ${bus} 0x40 $reg_0b 0
i2cset -y ${bus} 0x40 $reg_0c $low2
i2cset -y ${bus} 0x40 $reg_0d $high2
i2cset -y ${bus} 0x40 $reg_0e 0
i2cset -y ${bus} 0x40 $reg_0f 0
i2cset -y ${bus} 0x40 $reg_10 $low3
i2cset -y ${bus} 0x40 $reg_11 $high3