package api

import (
	"github.com/gin-gonic/gin"
	"github.com/go-playground/validator/v10"
	"qoobing.com/gomod/log"
	"qoobing.com/gomod/str"
)

var (
	validate              = validator.New()
	requestLogidGetter    = defaultLogidGetter
	errCodeUnknownError   = -10000
	errCodeUnimplementApi = -20401
)

type Engine struct {
	*gin.Engine
}

type BaseWithEnoOutput struct {
	Eno int    `json:"eno"`
	Err string `json:"err"`
}

type BaseWithCodeOutput struct {
	Code int    `json:"code"`
	Msg  string `json:"msg"`
}

type BaseWithErrCodeOutput struct {
	ErrCode int    `json:"errCode"`
	ErrMsg  string `json:"errMsg"`
}

func NewEngine() *Engine {
	gin.SetMode(gin.ReleaseMode)
	e := gin.New()
	e.Use(middlewareMyApiEngine())
	return &Engine{e}
}

func (e *Engine) POST(uri string, handler HandlerFunc) {
	e.Engine.POST(uri, handlerWrapper(handler))
}

// middlewareMyApiEngine myapi engine middleware
func middlewareMyApiEngine() gin.HandlerFunc {
	return func(c *gin.Context) {
		// Step 1. set logid
		id := requestLogidGetter(c)
		log.SetLogid(id)
		defer log.Cleanup()

		// Step 2. init *api.Context
		cc := New(c)
		c.Set("cc", cc)

		// Step 3. do request
		c.Next()
	}
}

// defaultLogidGetter get logid from "X-Request-Id" or create a new one.
func defaultLogidGetter(c *gin.Context) (logid string) {
	if logid = c.Request.Header.Get("X-Request-Id"); logid != "" {
		return logid
	}
	if logid = str.GetRandomNumString(13); logid != "" {
		return logid
	}
	panic("unreachable code")
}

func InitErrCodes(errcodes map[string]int) {
	if code, ok := errcodes["ErrCodeUnknownError"]; ok {
		errCodeUnknownError = code
	}
	if code, ok := errcodes["ErrCodeUnimplementApi"]; ok {
		errCodeUnknownError = code
	}
}