package openlog

import (
	"fmt"
	"log"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

const (
	CtxReqID   = "open_req_id"
	CtxDebug   = "open_debug"
	CtxBody    = "open_body"
	CtxStart   = "open_start"
	CtxAPIKey  = "open_api_key"
	CtxSide    = "open_side"
	CtxAPIType = "open_api_type"
	CtxAction  = "open_action"
)

const (
	SideClient = "client"
	SideSource = "source"

	APITypeClientV1     = "client_v1"
	APITypeSourceOpenV1 = "source_open_v1"
	APITypeUnknown      = "unknown"

	ActionAuth    = "auth"
	ActionList    = "list"
	ActionCreate  = "create"
	ActionQuery   = "query"
	ActionCancel  = "cancel"
	ActionWallet  = "wallet"
	ActionPush    = "push"
	ActionUnknown = "unknown"
)

// Enabled 是否开启开放接口详细日志
var Enabled bool

func Init(enabled bool) {
	Enabled = enabled
	if enabled {
		log.Printf("[open] 开放接口调试日志已开启 (OPEN_API_DEBUG)")
	}
}

func NewReqID() string {
	return strings.ReplaceAll(uuid.NewString(), "-", "")[:12]
}

func GetReqID(c *gin.Context) string {
	if v, ok := c.Get(CtxReqID); ok {
		if s, ok := v.(string); ok {
			return s
		}
	}
	return "-"
}

func EnsureReqID(c *gin.Context) string {
	if id := GetReqID(c); id != "-" {
		return id
	}
	id := NewReqID()
	c.Set(CtxReqID, id)
	return id
}

func SetScope(c *gin.Context, side, action string) {
	c.Set(CtxSide, side)
	c.Set(CtxAPIType, APITypeFromSide(side))
	c.Set(CtxAction, action)
}

func SetAction(c *gin.Context, action string) {
	c.Set(CtxAction, action)
}

func ScopeFromPath(side, method, path string) (string, string) {
	action := ActionUnknown
	switch side {
	case SideClient:
		action = clientAction(method, path)
	case SideSource:
		action = sourceAction(method, path)
	}
	return side, action
}

func APITypeFromSide(side string) string {
	switch side {
	case SideClient:
		return APITypeClientV1
	case SideSource:
		return APITypeSourceOpenV1
	default:
		return APITypeUnknown
	}
}

func IsDebug(c *gin.Context) bool {
	if !Enabled {
		return false
	}
	if v, ok := c.Get(CtxDebug); ok {
		if b, ok := v.(bool); ok {
			return b
		}
	}
	return Enabled
}

// MaskKey 脱敏 api_key：保留前缀与后 4 位
func MaskKey(key string) string {
	if key == "" {
		return "(empty)"
	}
	if len(key) <= 8 {
		return key[:2] + "***"
	}
	return key[:8] + "***" + key[len(key)-4:]
}

// MaskSign 脱敏签名：只保留前 8 位
func MaskSign(sign string) string {
	if sign == "" {
		return "(empty)"
	}
	if len(sign) <= 8 {
		return sign + "..."
	}
	return sign[:8] + "..."
}

// Truncate 截断过长字符串
func Truncate(s string, max int) string {
	if max <= 0 || len(s) <= max {
		return s
	}
	return s[:max] + fmt.Sprintf("...(%d bytes)", len(s))
}

func Prefix(c *gin.Context) string {
	side, _ := c.Get(CtxSide)
	apiType, _ := c.Get(CtxAPIType)
	action, _ := c.Get(CtxAction)
	sideText, _ := side.(string)
	apiTypeText, _ := apiType.(string)
	actionText, _ := action.(string)
	tag := "open"
	if apiTypeText != "" && apiTypeText != APITypeUnknown {
		tag += "." + apiTypeText
	} else if sideText != "" {
		tag += "." + sideText
	}
	if actionText != "" {
		tag += "." + actionText
	}
	fields := ""
	if apiTypeText != "" {
		fields += fmt.Sprintf(" api_type=%s", apiTypeText)
	}
	if actionText != "" {
		fields += fmt.Sprintf(" action=%s", actionText)
	}
	return fmt.Sprintf("[%s] req_id=%s%s ", tag, GetReqID(c), fields)
}

func Info(c *gin.Context, format string, args ...interface{}) {
	if !IsDebug(c) {
		return
	}
	log.Printf(Prefix(c)+format, args...)
}

func Warn(c *gin.Context, format string, args ...interface{}) {
	// 鉴权失败等也值得在 debug 时打出
	if !Enabled {
		return
	}
	log.Printf(Prefix(c)+format, args...)
}

func Elapsed(c *gin.Context) time.Duration {
	if v, ok := c.Get(CtxStart); ok {
		if t, ok := v.(time.Time); ok {
			return time.Since(t)
		}
	}
	return 0
}

func clientAction(method, path string) string {
	method = strings.ToUpper(method)
	switch {
	case method == "GET" && path == "/api/client/v1/products":
		return ActionList
	case method == "POST" && path == "/api/client/v1/orders":
		return ActionCreate
	case method == "GET" && strings.HasPrefix(path, "/api/client/v1/orders/") && strings.Contains(path, "/delivery"):
		return ActionQuery
	case method == "POST" && strings.HasPrefix(path, "/api/client/v1/orders/") && strings.Contains(path, "/delivery/bind"):
		return ActionCreate
	case method == "POST" && strings.HasPrefix(path, "/api/client/v1/orders/") && strings.Contains(path, "/delivery/submit"):
		return ActionCreate
	case method == "GET" && strings.HasPrefix(path, "/api/client/v1/orders/"):
		return ActionQuery
	case method == "POST" && strings.HasPrefix(path, "/api/client/v1/orders/") && strings.HasSuffix(path, "/cancel"):
		return ActionCancel
	case method == "GET" && path == "/api/client/v1/wallet":
		return ActionWallet
	default:
		return ActionUnknown
	}
}

func sourceAction(method, path string) string {
	method = strings.ToUpper(method)
	switch {
	case method == "GET" && strings.HasPrefix(path, "/api/open/v1/orders/"):
		return ActionQuery
	case method == "POST" && path == "/api/open/v1/orders/ship-notify":
		return ActionPush
	default:
		return ActionUnknown
	}
}