package main

import (
	"encoding/json"
	"fmt"
	"os"

	"git.algo.com.cn/public/saasapi"
)

// MapConfig 配置
type MapConfig struct {
	Targets map[string]*Target `json:"targets"`
}

// Target 配置
type Target struct {
	WriteByte              *byte   `json:"write_byte"`                 // byte值
	WriteBytePos           uint32  `json:"write_byte_pos"`             // byte写入位置
	WriteUint32            *uint32 `json:"write_uint32"`               // uint32值
	WriteUint32Pos         uint32  `json:"write_uint32_pos"`           // uint32写入位置
	WriteFlag              *bool   `json:"write_flag"`                 // 标志位
	WriteExpire            *uint32 `json:"write_expire"`               // 过期时间
	WriteFlagWithExpirePos uint32  `json:"write_flag_with_expire_pos"` // 标志与过期写入位置

}

// LoadConfigFile 加载配置文件
func LoadMapFile(filename string) (*MapConfig, error) {
	// 打开文件
	f, err := os.Open(filename)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	sc := &MapConfig{}

	err = json.NewDecoder(f).Decode(sc)

	if err != nil {
		return nil, err
	}

	for targetName, targetInfo := range sc.Targets {
		if targetInfo.WriteBytePos >= uint32(saasapi.MAX_U8) {
			err = fmt.Errorf("%v WriteBytePos>MAX_U8 , current %v, MAX %v", targetName, targetInfo.WriteBytePos, uint32(saasapi.MAX_U8)-1)
			break
		}
		if targetInfo.WriteUint32Pos >= uint32(saasapi.MAX_U32) {
			err = fmt.Errorf("%v WriteUint32Pos>MAX_U32 , current %v, MAX %v", targetName, targetInfo.WriteUint32Pos, uint32(saasapi.MAX_U32)-1)
			break
		}
		if targetInfo.WriteFlagWithExpirePos >= uint32(saasapi.MAX_FLAG) {
			err = fmt.Errorf("%v WriteFlagWithExpirePos>MAX_FLAG , current %v, MAX %v", targetName, targetInfo.WriteFlagWithExpirePos, uint32(saasapi.MAX_FLAG)-1)
			break
		}
	}

	return sc, err
}