package main

import (
	"errors"
	"fmt"
	"net/http"
	"strconv"

	"gitea.seeseepuff.be/seeseemelk/mysqlite"
	"github.com/gin-gonic/gin"
)

type App struct {
	db *mysqlite.Db
}

type IndexVM struct {
	AssetCount       int
	BrandCount       int
	TotalRamCapacity int
	Brands           []string
	Types            []string
}

func (a *App) getIndex(c *gin.Context) {
	vm := &IndexVM{}
	var err error
	vm.AssetCount, err = a.GetAssetCount()
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	vm.BrandCount, err = a.GetBrandCount()
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	vm.TotalRamCapacity, err = a.GetTotalRamCapacity()
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	vm.Brands, err = a.GetAllBrands()
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	vm.Types, err = a.GetAllTypes()
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	c.HTML(http.StatusOK, "index", vm)
}

type DeviceVM struct {
	Qr          int
	Name        string
	Brand       string
	Type        string
	Description string
	RamType     string
	RamCapacity int
}

func (a *App) getDevice(c *gin.Context) {
	qr, err := strconv.Atoi(c.Query("id"))
	if err != nil {
		c.AbortWithError(http.StatusBadRequest, err)
		return
	}

	var count int
	err = a.db.Query("SELECT COUNT(*) FROM assets WHERE qr = ?").
		Bind(qr).
		ScanSingle(&count)
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	if count == 0 {
		c.Redirect(http.StatusTemporaryRedirect, "/create?id="+strconv.Itoa(qr))
		return
	}

	vm := &DeviceVM{Qr: qr}
	err = a.db.Query("SELECT name, brand, type, description FROM assets WHERE qr = ?").
		Bind(qr).
		ScanSingle(&vm.Name, &vm.Brand, &vm.Type, &vm.Description)
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	if vm.Type == "ram" {
		err = a.db.Query("SELECT type, capacity FROM info_ram WHERE asset = ?").
			Bind(qr).
			ScanSingle(&vm.RamType, &vm.RamCapacity)
		if err != nil {
			c.AbortWithError(http.StatusInternalServerError, err)
			return
		}
	}

	c.HTML(http.StatusOK, "device", vm)
}

type CreateDeviceVM struct {
	Qr               *int
	Type             string
	Brands           []string
	RamTypes         []string
	AssetName        string
	AssetBrand       string
	AssetDescription string
	RamType          string
	RamCapacity      int
	IsEdit           bool
}

func (a *App) getCreateDevice(c *gin.Context) {
	vm := &CreateDeviceVM{}

	qr := c.Query("id")
	if qr != "" {
		qrInt, err := strconv.Atoi(qr)
		if err != nil {
			c.AbortWithError(http.StatusInternalServerError, fmt.Errorf("invalid qr: %v", err))
			return
		}
		vm.Qr = &qrInt
	}

	brands, err := a.GetAllBrands()
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	types, err := a.GetAllRAMTypes()
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	vm.Type = c.Query("type")
	vm.Brands = brands
	vm.RamTypes = types

	if c.Query("edit") != "" && vm.Qr != nil {
		vm.IsEdit = true
		err = a.db.Query("SELECT name, type, brand, description FROM assets WHERE qr = ?").
			Bind(*vm.Qr).
			ScanSingle(&vm.AssetName, &vm.Type, &vm.AssetBrand, &vm.AssetDescription)
		if err != nil {
			c.AbortWithError(http.StatusInternalServerError, err)
			return
		}
		if vm.Type == "ram" {
			err = a.db.Query("SELECT type, capacity FROM info_ram WHERE asset = ?").
				Bind(*vm.Qr).
				ScanSingle(&vm.RamType, &vm.RamCapacity)
			if err != nil {
				c.AbortWithError(http.StatusInternalServerError, err)
				return
			}
		}
	}

	c.HTML(http.StatusOK, "create_device", vm)
}

func (a *App) postCreateDevice(c *gin.Context) {
	qr, err := strconv.Atoi(c.PostForm("qr"))
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, fmt.Errorf("invalid qr: %v", err))
	}
	assetType := c.PostForm("asset_type")

	if assetType == "ram" {
		err = a.postCreateDeviceRam(c, qr)
	} else {
		c.AbortWithError(http.StatusInternalServerError, fmt.Errorf("invalid type: %s", assetType))
		return
	}

	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}
	c.Redirect(http.StatusSeeOther, "/")
}

func (a *App) postCreateDeviceRam(c *gin.Context, qr int) error {
	var err error
	capacity := 0
	capacityString := c.PostForm("ram_capacity")
	if capacityString != "" {
		capacity, err = strconv.Atoi(c.PostForm("ram_capacity"))
		if err != nil {
			return err
		}
	}
	switch c.PostForm("ram_capacity_unit") {
	case "B":
	case "KB":
		capacity *= 1024
	case "MB":
		capacity *= 1024 * 1024
	case "GB":
		capacity *= 1024 * 1024 * 1024
	default:
		return errors.New("invalid ram_capacity_unit")
	}

	tx, err := a.db.Begin()
	defer tx.MustRollback()
	if err != nil {
		return err
	}

	err = tx.Query("DELETE FROM assets WHERE qr=?").Bind(qr).Exec()
	if err != nil {
		return err
	}

	err = tx.Query("DELETE FROM info_ram WHERE asset=?").Bind(qr).Exec()
	if err != nil {
		return err
	}

	err = tx.Query("INSERT INTO assets (qr, type, brand, name, description) VALUES (?, ?, ?, ?, ?)").
		Bind(qr, c.PostForm("asset_type"), c.PostForm("asset_brand"), c.PostForm("asset_name"), c.PostForm("asset_description")).
		Exec()
	if err != nil {
		return err
	}

	err = tx.Query("INSERT INTO info_ram (asset, type, capacity) VALUES (?, ?, ?)").
		Bind(qr, c.PostForm("ram_type"), capacity).Exec()
	if err != nil {
		return err
	}
	return tx.Commit()
}

type BrowseVM struct {
	Assets []Asset
	HasRam bool
}

type Asset struct {
	Qr          int
	Name        string
	Brand       string
	Type        string
	Description string
	RamType     string
	RamCapacity int
}

func (a *App) getBrowse(c *gin.Context) {
	brands := c.QueryArray("brand")
	types := c.QueryArray("type")

	query := `SELECT assets.qr, assets.name, assets.brand, assets.type, assets.description,
    			info_ram.type, info_ram.capacity
				FROM assets 
				JOIN info_ram ON info_ram.asset = assets.qr
				WHERE 1=1`
	if len(brands) > 0 {
		query += " AND assets.brand IN (" + placeholders(len(brands)) + ")"
	}
	if len(types) > 0 {
		query += " AND assets.type IN (" + placeholders(len(types)) + ")"
	}
	query += "ORDER BY assets.type, assets.brand, assets.name, assets.qr"

	vm := &BrowseVM{}

	var err error
	q := a.db.Query(query).Bind(brands, types)
	for row := range q.Range(&err) {
		var asset Asset
		err := row.Scan(&asset.Qr, &asset.Name, &asset.Brand, &asset.Type, &asset.Description, &asset.RamType, &asset.RamCapacity)
		if err != nil {
			c.AbortWithError(http.StatusInternalServerError, err)
			return
		}
		vm.Assets = append(vm.Assets, asset)
		if asset.Type == "ram" {
			vm.HasRam = true
		}
	}
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	c.HTML(http.StatusOK, "browse", vm)
}

func placeholders(count int) string {
	if count == 0 {
		return ""
	}
	placeholder := "?"
	for count > 1 {
		placeholder += ", ?"
		count--
	}
	return placeholder
}