// Copyright 2019 Yunion
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package middleware

import (
	"time"

	gin "github.com/gin-gonic/gin"

	"yunion.io/x/log"
)

var (
	green   = string([]byte{27, 91, 57, 55, 59, 52, 50, 109})
	white   = string([]byte{27, 91, 57, 48, 59, 52, 55, 109})
	yellow  = string([]byte{27, 91, 57, 55, 59, 52, 51, 109})
	red     = string([]byte{27, 91, 57, 55, 59, 52, 49, 109})
	blue    = string([]byte{27, 91, 57, 55, 59, 52, 52, 109})
	magenta = string([]byte{27, 91, 57, 55, 59, 52, 53, 109})
	cyan    = string([]byte{27, 91, 57, 55, 59, 52, 54, 109})
	reset   = string([]byte{27, 91, 48, 109})
)

// ErrorLogger returns an ErrorLoggerT with parameter gin.ErrorTypeAny
func ErrorLogger() gin.HandlerFunc {
	return ErrorLoggerT(gin.ErrorTypeAny)
}

// ErrorLoggerT returns an ErrorLoggerT middleware with the given
// type gin.ErrorType.
func ErrorLoggerT(typ gin.ErrorType) gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Next()

		if !c.Writer.Written() {
			json := c.Errors.ByType(typ).JSON()
			if json != nil {
				c.JSON(-1, json)
			}
		}
	}
}

// Logger prints a logline for each request and measures the time to
// process for a call. It formats the log entries similar to
// http://godoc.org/github.com/gin-gonic/gin#Logger does.
//
// Example:
//
//	router := gin.New()
//	router.Use(ginglog.Logger())
func Logger() gin.HandlerFunc {
	return func(c *gin.Context) {
		t := time.Now()

		// process request
		c.Next()

		latency := time.Since(t)
		clientIP := c.ClientIP()
		method := c.Request.Method
		statusCode := c.Writer.Status()
		// statusColor := colorForStatus(statusCode)
		// methodColor := colorForMethod(method)
		path := c.Request.URL.Path

		switch {
		case statusCode >= 400 && statusCode <= 499:
			{
				log.Warningf("[GIN] | %3d | %12v | %s | %-7s %s\n%s",
					// statusColor,
					statusCode,
					// reset,
					latency,
					clientIP,
					// methodColor,
					// reset,
					method,
					path,
					c.Errors.String(),
				)
			}
		case statusCode >= 500:
			{
				log.Errorf("[GIN] | %3d | %12v | %s | %-7s %s\n%s",
					// statusColor,
					statusCode,
					// reset,
					latency,
					clientIP,
					// methodColor,
					// reset,
					method,
					path,
					c.Errors.String(),
				)
			}
		default:
			log.V(2).Infof("[GIN] | %3d | %12v | %s | %-7s %s\n%s",
				// statusColor,
				statusCode,
				// reset,
				latency,
				clientIP,
				// methodColor,
				// reset,
				method,
				path,
				c.Errors.String(),
			)
		}

	}
}

func colorForStatus(code int) string {
	switch {
	case code >= 200 && code <= 299:
		return green
	case code >= 300 && code <= 399:
		return white
	case code >= 400 && code <= 499:
		return yellow
	default:
		return red
	}
}

func colorForMethod(method string) string {
	switch {
	case method == "GET":
		return blue
	case method == "POST":
		return cyan
	case method == "PUT":
		return yellow
	case method == "DELETE":
		return red
	case method == "PATCH":
		return green
	case method == "HEAD":
		return magenta
	case method == "OPTIONS":
		return white
	default:
		return reset
	}
}