package model

import (
	"errors"
	"os"
	"strconv"
	"strings"

	"github.com/knadh/koanf/parsers/yaml"
	"github.com/knadh/koanf/providers/env"
	"github.com/knadh/koanf/providers/file"
	"github.com/knadh/koanf/v2"
)

var Languages = map[string]string{
	"zh-CN": "简体中文",
	"zh-TW": "繁體中文",
	"en-US": "English",
	"es-ES": "Español",
}

var Themes = map[string]string{
	"default":       "Default",
	"daynight":      "JackieSung DayNight",
	"mdui":          "Neko Mdui",
	"hotaru":        "Hotaru",
	"angel-kanade":  "AngelKanade",
	"server-status": "ServerStatus",
	"custom":        "Custom(local)",
}

var DashboardThemes = map[string]string{
	"default": "Default",
	"custom":  "Custom(local)",
}

const (
	ConfigTypeGitHub     = "github"
	ConfigTypeGitee      = "gitee"
	ConfigTypeGitlab     = "gitlab"
	ConfigTypeJihulab    = "jihulab"
	ConfigTypeGitea      = "gitea"
	ConfigTypeCloudflare = "cloudflare"
	ConfigTypeOidc       = "oidc"
)

const (
	ConfigCoverAll = iota
	ConfigCoverIgnoreAll
)

// Config 站点配置
type Config struct {
	Debug    bool   // debug模式开关
	Language string // 系统语言，默认 zh-CN
	Site     struct {
		Brand               string // 站点名称
		CookieName          string // 浏览器 Cookie 名称
		Theme               string
		DashboardTheme      string
		CustomCode          string
		CustomCodeDashboard string
		ViewPassword        string // 前台查看密码
	}
	Oauth2 struct {
		Type            string
		Admin           string // 管理员用户名列表
		AdminGroups     string // 管理员用户组列表
		ClientID        string
		ClientSecret    string
		Endpoint        string
		OidcDisplayName string // for OIDC Display Name
		OidcIssuer      string // for OIDC Issuer
		OidcLogoutURL   string // for OIDC Logout URL
		OidcRegisterURL string // for OIDC Register URL
		OidcLoginClaim  string // for OIDC Claim
		OidcGroupClaim  string // for OIDC Group Claim
		OidcScopes      string // for OIDC Scopes
		OidcAutoCreate  bool   // for OIDC Auto Create
		OidcAutoLogin   bool   // for OIDC Auto Login
	}
	HTTPPort      uint
	GRPCPort      uint
	GRPCHost      string
	ProxyGRPCPort uint
	TLS           bool

	EnablePlainIPInNotification     bool // 通知信息IP不打码
	DisableSwitchTemplateInFrontend bool // 前台禁用切换模板功能

	// IP变更提醒
	EnableIPChangeNotification bool
	IPChangeNotificationTag    string
	Cover                      uint8  // 覆盖范围（0:提醒未被 IgnoredIPNotification 包含的所有服务器; 1:仅提醒被 IgnoredIPNotification 包含的服务器;）
	IgnoredIPNotification      string // 特定服务器IP（多个服务器用逗号分隔）

	Location string // 时区，默认为 Asia/Shanghai

	IgnoredIPNotificationServerIDs map[uint64]bool // [ServerID] -> bool(值为true代表当前ServerID在特定服务器列表内）
	MaxTCPPingValue                int32
	AvgPingCount                   int

	DNSServers string

	k        *koanf.Koanf
	filePath string
}

// Read 读取配置文件并应用
func (c *Config) Read(path string) error {
	c.k = koanf.New(".")
	c.filePath = path

	// 先读取环境变量，然后读取配置文件；后者可以覆盖前者，因为哪吒支持在线修改配置

	err := c.k.Load(env.Provider("NZ_", ".", func(s string) string {
		return strings.Replace(strings.ToLower(strings.TrimPrefix(s, "NZ_")), "_", ".", -1)
	}), nil)
	if err != nil {
		return err
	}

	if _, err := os.Stat(path); err == nil {
		err = c.k.Load(file.Provider(path), yaml.Parser())
		if err != nil {
			return err
		}
	}

	err = c.k.Unmarshal("", c)
	if err != nil {
		return err
	}

	if c.Oauth2.Type == "" || c.Oauth2.Admin == "" || c.Oauth2.ClientID == "" || c.Oauth2.ClientSecret == "" {
		return errors.New("missing oauth2 config")
	}

	if c.Site.Brand == "" {
		c.Site.Brand = "NeZha"
	}
	if c.Site.CookieName == "" {
		c.Site.CookieName = "nezha-dashboard"
	}
	if c.Site.Theme == "" {
		c.Site.Theme = "default"
	}
	if c.Site.DashboardTheme == "" {
		c.Site.DashboardTheme = "default"
	}
	if c.Language == "" {
		c.Language = "zh-CN"
	}
	if c.HTTPPort == 0 {
		c.HTTPPort = 80
	}
	if c.GRPCPort == 0 {
		c.GRPCPort = 5555
	}
	if c.EnableIPChangeNotification && c.IPChangeNotificationTag == "" {
		c.IPChangeNotificationTag = "default"
	}
	if c.Location == "" {
		c.Location = "Asia/Shanghai"
	}
	if c.MaxTCPPingValue == 0 {
		c.MaxTCPPingValue = 1000
	}
	if c.AvgPingCount == 0 {
		c.AvgPingCount = 2
	}
	if c.Oauth2.OidcScopes == "" {
		c.Oauth2.OidcScopes = "openid,profile,email"
	}
	if c.Oauth2.OidcLoginClaim == "" {
		c.Oauth2.OidcLoginClaim = "sub"
	}
	if c.Oauth2.OidcDisplayName == "" {
		c.Oauth2.OidcDisplayName = "OIDC"
	}
	if c.Oauth2.OidcGroupClaim == "" {
		c.Oauth2.OidcGroupClaim = "groups"
	}

	c.updateIgnoredIPNotificationID()
	return nil
}

// updateIgnoredIPNotificationID 更新用于判断服务器ID是否属于特定服务器的map
func (c *Config) updateIgnoredIPNotificationID() {
	c.IgnoredIPNotificationServerIDs = make(map[uint64]bool)
	splitedIDs := strings.Split(c.IgnoredIPNotification, ",")
	for i := 0; i < len(splitedIDs); i++ {
		id, _ := strconv.ParseUint(splitedIDs[i], 10, 64)
		if id > 0 {
			c.IgnoredIPNotificationServerIDs[id] = true
		}
	}
}

// Save 保存配置文件
func (c *Config) Save() error {
	c.updateIgnoredIPNotificationID()
	data, err := c.k.Marshal(yaml.Parser())
	if err != nil {
		return err
	}
	return os.WriteFile(c.filePath, data, 0600)
}