package routers

import (
	"crypto/sha256"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"main/configs"
	"main/models"
	"main/utils"
	"net/http"
	"os"
	"strconv"

	"github.com/gorilla/mux"
)

func init() {
	models_update()
}

func models_update() {
	// 初始化模型路由: 检查本地模型目录是否存在, 不存在则创建
	if _, err := os.Stat("data/models"); err != nil {
		if err := os.MkdirAll("data/models", 0777); err != nil {
			log.Println(err)
		}
	}
	// 检查模型目录中是否存在模型文件, 如果存在且数据库中未记录, 则将模型信息写入数据库
	if files, err := ioutil.ReadDir("data/models"); err == nil {
		for _, file := range files {
			if file.IsDir() {
				continue
			}

			log.Println("检查模型是否存在:", file.Name())

			// 检查文件是否已经存在
			var model models.Model
			if err := configs.ORMDB().Take(&model, "name = ?", file.Name()).Error; err == nil {
				continue
			}

			// 计算文件的 sha256 值
			f, err := os.Open("data/models/" + file.Name())
			if err != nil {
				log.Println(err)
				continue
			}
			defer f.Close()

			hash := sha256.New()
			if _, err := io.Copy(hash, f); err != nil {
				log.Println(err)
				continue
			}

			model.Name = file.Name()
			model.Hash = fmt.Sprintf("%x", hash.Sum(nil))
			model.ModelPath = "data/models/" + file.Name()
			model.Type = "ckp"
			model.Status = "success"
			model.Progress = 100
			model.Tags = []string{"平台模型"}

			log.Println("模型不存在, 添加到数据库:", file.Name())
			configs.ORMDB().Create(&model)
		}
	}
}

// 更新检查本地模型列表
func ModelsUpdate(w http.ResponseWriter, r *http.Request) {
	models_update()
	w.Write([]byte("ok"))
}

// 獲取模型列表
func ModelsGet(w http.ResponseWriter, r *http.Request) {
	var listview models.ListView
	listview.Page = utils.ParamInt(r.URL.Query().Get("page"), 1)
	listview.PageSize = utils.ParamInt(r.URL.Query().Get("pageSize"), 10)

	var model_list []models.Model
	db := configs.ORMDB()

	// 按照 user_id 篩選
	if user_id := utils.ParamInt(r.URL.Query().Get("user_id"), 0); user_id > 0 {
		db = db.Where("user_id = ?", user_id)
	}

	// 按照 star 篩選
	if star := utils.ParamInt(r.URL.Query().Get("star"), 0); star > 0 {
		db = db.Where("stars LIKE ?", "%"+strconv.Itoa(star)+"%")
	}

	// 按照 name 模糊搜索
	if name := r.URL.Query().Get("name"); name != "" {
		db = db.Where("name LIKE ?", "%"+name+"%")
	}

	// 按照 type 篩選
	if model_type := r.URL.Query().Get("type"); model_type != "" {
		db = db.Where("type = ?", model_type)
	}

	// 按照 status 篩選
	if status := r.URL.Query().Get("status"); status != "" {
		db = db.Where("status = ?", status)
	}

	// 按照 tag 篩選
	if tag := r.URL.Query().Get("tag"); tag != "" {
		db = db.Where("tags LIKE ?", "%"+tag+"%")
	}

	db.Offset((listview.Page - 1) * listview.PageSize).Limit(listview.PageSize).Find(&model_list)
	for _, model := range model_list {
		listview.List = append(listview.List, model)
	}
	db.Model(&models.Model{}).Count(&listview.Total)
	listview.Next = listview.Page*listview.PageSize < int(listview.Total)
	listview.WriteJSON(w)
}

// 創建模型(訓練新模型)
func ModelsPost(w http.ResponseWriter, r *http.Request) {
	models.AccountRead(w, r, func(account *models.Account) {
		fmt.Println(account)

		// 創建模型
		var model models.Model
		body, err := ioutil.ReadAll(r.Body)
		if err != nil {
			w.WriteHeader(http.StatusBadRequest)
			w.Write([]byte(err.Error()))
			return
		}
		defer r.Body.Close()

		if err = json.Unmarshal(body, &model); err != nil {
			w.WriteHeader(http.StatusBadRequest)
			w.Write([]byte(err.Error()))
			return
		}

		if model.Name == "" {
			model.Name = utils.RandomString(8)
		}

		if model.Type == "" {
			w.WriteHeader(http.StatusBadRequest)
			w.Write([]byte("模型類型不能為空(recommend|lora|ckp|hyper|ti)"))
			return
		}

		if model.TriggerWords == "" {
			w.WriteHeader(http.StatusBadRequest)
			w.Write([]byte("觸發詞不能為空"))
			return
		}

		if model.BaseModel == "" {
			w.WriteHeader(http.StatusBadRequest)
			w.Write([]byte("基礎模型不能為空(SD1.5|SD2)"))
			return
		}

		if model.Epochs <= 0 {
			w.WriteHeader(http.StatusBadRequest)
			w.Write([]byte("訓練輪數不能小於0"))
			return
		}

		if model.Tags == nil {
			model.Tags = []string{}
		}

		model.UserID = account.ID
		model.Status = "initial"

		if err := configs.ORMDB().Create(&model).Error; err != nil {
			log.Println(err)
			return
		}

		// 直接提交訓練任務
		// go model.Train()

		// 返回創建的模型
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		w.Write(utils.ToJSON(model))
	})
}

// 獲取模型詳情
func ModelItemGet(w http.ResponseWriter, r *http.Request) {
	var model = models.Model{ID: utils.ParamInt(mux.Vars(r)["id"], 0)}
	if err := configs.ORMDB().Take(&model, utils.ParamInt(mux.Vars(r)["id"], 0)).Error; err != nil {
		w.WriteHeader(http.StatusNotFound)
		w.Write([]byte(err.Error()))
		return
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(utils.ToJSON(model))
}

// 更新模型
func ModelItemPatch(w http.ResponseWriter, r *http.Request) {
	var model = models.Model{ID: utils.ParamInt(mux.Vars(r)["id"], 0)}
	if err := configs.ORMDB().Take(&model, utils.ParamInt(mux.Vars(r)["id"], 0)).Error; err != nil {
		w.WriteHeader(http.StatusNotFound)
		w.Write([]byte(err.Error()))
		return
	}

	// 取出更新数据
	var model_new 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_new); err != nil {
		log.Println(err)
		return
	}

	// 字段不爲空且不等於原始數據時更新
	if model_new.Name != "" && model_new.Name != model.Name {
		model.Name = model_new.Name
	}
	if model_new.Type != "" && model_new.Type != model.Type {
		model.Type = model_new.Type
	}
	if model_new.Status != "" && model_new.Status != model.Status {
		model.Status = model_new.Status
		// 如果狀態被改變爲 ready, 將模型發送到訓練隊列
		if model.Status == "ready" {
			model.Status = "training"
			//go model.Train()
		}
	}
	if model_new.Image != "" && model_new.Image != model.Image {
		model.Image = model_new.Image
	}
	if model_new.TriggerWords != "" && model_new.TriggerWords != model.TriggerWords {
		model.TriggerWords = model_new.TriggerWords
	}
	if model_new.BaseModel != "" && model_new.BaseModel != model.BaseModel {
		model.BaseModel = model_new.BaseModel
	}
	if model_new.ModelPath != "" && model_new.ModelPath != model.ModelPath {
		model.ModelPath = model_new.ModelPath
	}
	if model_new.Hash != "" && model_new.Hash != model.Hash {
		model.Hash = model_new.Hash
	}
	if model_new.Epochs != 0 && model_new.Epochs != model.Epochs {
		model.Epochs = model_new.Epochs
	}
	if model_new.Progress != 0 && model_new.Progress != model.Progress {
		model.Progress = model_new.Progress
	}
	if model_new.Tags != nil && len(model_new.Tags) != len(model.Tags) {
		model.Tags = model_new.Tags
	}

	// 執行更新
	if err := configs.ORMDB().Save(&model).Error; err != nil {
		log.Println(err)
		return
	}

	// 返回更新後的數據
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(utils.ToJSON(model))
}

// 刪除模型
func ModelItemDelete(w http.ResponseWriter, r *http.Request) {
	var model = models.Model{ID: utils.ParamInt(mux.Vars(r)["id"], 0)}
	if err := configs.ORMDB().Take(&model, utils.ParamInt(mux.Vars(r)["id"], 0)); err != nil {
		w.WriteHeader(http.StatusNotFound)
		return
	}
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.Write(utils.ToJSON(model))
}