package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"runtime"
	"strconv"
	"text/template"
	"time"

	"main/models"

	"github.com/gorilla/mux"
)

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())

	r := mux.NewRouter()
	r.Use(middleware)
	r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		t, _ := template.ParseFiles("templates/index.html")
		t.Execute(w, nil)
	})
	r.HandleFunc("/api/models", models_get).Methods("GET")
	r.HandleFunc("/api/models", models_post).Methods("POST")
	r.HandleFunc("/api/models/{id}", models_item_get).Methods("GET")
	r.HandleFunc("/api/models/{id}", models_item_patch).Methods("PATCH")
	r.HandleFunc("/api/models/{id}", models_item_delete).Methods("DELETE")

	r.HandleFunc("/api/images", images_get).Methods("GET")
	r.HandleFunc("/api/images", images_post).Methods("POST")
	r.HandleFunc("/api/images/{id}", images_item_get).Methods("GET")
	r.HandleFunc("/api/images/{id}", images_item_patch).Methods("PATCH")
	r.HandleFunc("/api/images/{id}", images_item_delete).Methods("DELETE")

	r.HandleFunc("/api/tasks", tasks_get).Methods("GET")
	r.HandleFunc("/api/tasks", tasks_post).Methods("POST")
	r.HandleFunc("/api/tasks/{id}", tasks_item_get).Methods("GET")
	r.HandleFunc("/api/tasks/{id}", tasks_item_patch).Methods("PATCH")
	r.HandleFunc("/api/tasks/{id}", tasks_item_delete).Methods("DELETE")

	log.Println("Web Server is running on http://localhost:8080")
	http.ListenAndServe(":8080", r)
}

func models_get(w http.ResponseWriter, r *http.Request) {
	var listview models.ListView
	listview.Page = ParamInt(r.URL.Query().Get("page"), 1)
	listview.PageSize = ParamInt(r.URL.Query().Get("pageSize"), 10)
	listview.List = models.QueryModels(listview.Page, listview.PageSize)
	listview.Total = models.CountModels()
	listview.Next = listview.Page*listview.PageSize < listview.Total
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(listview.ToJSON())
}

func models_post(w http.ResponseWriter, r *http.Request) {
	var model models.Model
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		log.Println(err)
		return
	}
	defer r.Body.Close()
	if err = json.Unmarshal(body, &model); err != nil {
		log.Println(err)
		return
	}
	model.Create()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(model))
}

func models_item_get(w http.ResponseWriter, r *http.Request) {
	model := models.Model{ID: ParamInt(mux.Vars(r)["id"], 0)}
	model.Get()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(model))
}

func models_item_patch(w http.ResponseWriter, r *http.Request) {
	model := models.Model{}
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		log.Println(err)
		return
	}
	defer r.Body.Close()
	if err = json.Unmarshal(body, &model); err != nil {
		log.Println(err)
		return
	}
	model.ID = ParamInt(mux.Vars(r)["id"], 0)
	model.Update()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(model))
}

func models_item_delete(w http.ResponseWriter, r *http.Request) {
	model := models.Model{ID: ParamInt(mux.Vars(r)["id"], 0)}
	model.Delete()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(model))
}

func images_get(w http.ResponseWriter, r *http.Request) {
	var listview models.ListView
	listview.Page = ParamInt(r.URL.Query().Get("page"), 1)
	listview.PageSize = ParamInt(r.URL.Query().Get("pageSize"), 10)
	listview.List = models.QueryImages(listview.Page, listview.PageSize)
	listview.Total = models.CountImages()
	listview.Next = listview.Page*listview.PageSize < listview.Total
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(listview))
}

func images_post(w http.ResponseWriter, r *http.Request) {
	var image models.Image
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		log.Println(err)
		return
	}
	defer r.Body.Close()
	if err = json.Unmarshal(body, &image); err != nil {
		log.Println(err)
		return
	}
	image.Create()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(image))
}

func images_item_get(w http.ResponseWriter, r *http.Request) {
	image := models.Image{ID: ParamInt(mux.Vars(r)["id"], 0)}
	image.Get()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(image))
}

func images_item_patch(w http.ResponseWriter, r *http.Request) {
	image := models.Image{}
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		log.Println(err)
		return
	}
	defer r.Body.Close()
	if err = json.Unmarshal(body, &image); err != nil {
		log.Println(err)
		return
	}
	image.ID = ParamInt(mux.Vars(r)["id"], 0)
	image.Update()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(image))
}

func images_item_delete(w http.ResponseWriter, r *http.Request) {
	image := models.Image{ID: ParamInt(mux.Vars(r)["id"], 0)}
	image.Delete()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(image))
}

func tasks_get(w http.ResponseWriter, r *http.Request) {
	var listview models.ListView
	listview.Page = ParamInt(r.URL.Query().Get("page"), 1)
	listview.PageSize = ParamInt(r.URL.Query().Get("pageSize"), 10)
	listview.List = models.QueryTasks(listview.Page, listview.PageSize)
	listview.Total = models.CountTasks()
	listview.Next = listview.Page*listview.PageSize < listview.Total
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(listview))
}

func tasks_post(w http.ResponseWriter, r *http.Request) {
	var task models.Task
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		log.Println(err)
		return
	}
	defer r.Body.Close()
	if err = json.Unmarshal(body, &task); err != nil {
		log.Println(err)
		return
	}
	task.Create()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(task))
}

func tasks_item_get(w http.ResponseWriter, r *http.Request) {
	task := models.Task{ID: ParamInt(mux.Vars(r)["id"], 0)}
	task.Get()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(task))
}

func tasks_item_patch(w http.ResponseWriter, r *http.Request) {
	task := models.Task{}
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		log.Println(err)
		return
	}
	defer r.Body.Close()
	if err = json.Unmarshal(body, &task); err != nil {
		log.Println(err)
		return
	}
	task.ID = ParamInt(mux.Vars(r)["id"], 0)
	task.Update()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(task))
}

func tasks_item_delete(w http.ResponseWriter, r *http.Request) {
	task := models.Task{ID: ParamInt(mux.Vars(r)["id"], 0)}
	task.Delete()
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(ToJSON(task))
}

// 中間件, 通用
func middleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer LogComponent(time.Now().UnixNano(), r) // 最后打印日志
		// 處理跨域請求
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With")
		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
		// 處理OPTIONS請求
		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusOK)
			return
		}
		next.ServeHTTP(w, r)
	})
}

func ToJSON(object interface{}) []byte {
	json, err := json.MarshalIndent(object, "", "  ")
	if err != nil {
		log.Println(err)
		return []byte{}
	}
	return json
}

func LogComponent(startTime int64, r *http.Request) {
	ms := (time.Now().UnixNano() - startTime) / 1000000
	color := "\033[1;32m%d\033[0m"
	if ms > 800 {
		color = "\033[1;31m%dms\033[0m" // 紅色加重
	} else if ms > 500 {
		color = "\033[1;33m%dms\033[0m" // 黃色加重
	} else if ms > 300 {
		color = "\033[1;32m%dms\033[0m" // 綠色加重
	} else if ms > 200 {
		color = "\033[1;34m%dms\033[0m" // 藍色加重
	} else if ms > 100 {
		color = "\033[1;35m%dms\033[0m" // 紫色加重
	} else {
		color = "\033[1;36m%dms\033[0m" // 黑色加重
	}
	endTime := fmt.Sprintf(color, ms)
	method := fmt.Sprintf("\033[1;32m%s\033[0m", r.Method) // 綠色加重
	url := fmt.Sprintf("\033[1;34m%s\033[0m", r.URL)       // 藍色加重
	log.Println(method, url, endTime)
}

// 獲取查詢參數(int 類型)
func ParamInt(value string, defaultValue int) int {
	if value == "" {
		return defaultValue
	}
	result, err := strconv.Atoi(value)
	if err != nil {
		return defaultValue
	}
	return result
}

// 獲取查詢參數(string 類型)
func ParamString(value string, defaultValue string) string {
	if value == "" {
		return defaultValue
	}
	return value
}

// 獲取查詢參數(bool 類型)
func ParamBool(value string, defaultValue bool) bool {
	if value == "" {
		return defaultValue
	}
	result, err := strconv.ParseBool(value)
	if err != nil {
		return defaultValue
	}
	return result
}