package routes

import (
	"fmt"
	"math"
	"net/http"
	"proxmoxaas-dashboard/app/common"

	"github.com/gin-gonic/gin"
	"github.com/go-viper/mapstructure/v2"
)

type Account struct {
	Username string
	Pools    map[string]bool
	Nodes    map[string]bool
	VMID     struct {
		Min int
		Max int
	}
	Resources map[string]any
}

type Constraint struct {
	Max   int64
	Used  int64
	Avail int64
}

type Match struct {
	Name  string
	Match string
	Max   int64
	Used  int64
	Avail int64
}

type NumericResource struct {
	Type       string
	Name       string
	Multiplier int64
	Base       int64
	Compact    bool
	Unit       string
	Display    bool
	Global     Constraint
	Nodes      map[string]Constraint
	Total      Constraint
}

type StorageResource struct {
	Type       string
	Name       string
	Multiplier int64
	Base       int64
	Compact    bool
	Unit       string
	Display    bool
	Disks      []string
	Global     Constraint
	Nodes      map[string]Constraint
	Total      Constraint
}

type ListResource struct {
	Type      string
	Whitelist bool
	Display   bool
	Global    []Match
	Nodes     map[string][]Match
	Total     []Match
}

type ResourceChart struct {
	Type    string
	Display bool
	Name    string
	Used    int64
	Max     int64
	Avail   float64
	Prefix  string
	Unit    string
}

func HandleGETAccount(c *gin.Context) {
	auth, err := common.GetAuth(c)
	if err == nil {
		account, err := GetUserAccount(auth)
		if err != nil {
			common.HandleNonFatalError(c, err)
			return
		}

		for k, v := range account.Resources {
			switch t := v.(type) {
			case NumericResource:
				avail, prefix := FormatNumber(t.Total.Avail*t.Multiplier, t.Base)
				account.Resources[k] = ResourceChart{
					Type:    t.Type,
					Display: t.Display,
					Name:    t.Name,
					Used:    t.Total.Used,
					Max:     t.Total.Max,
					Avail:   avail,
					Prefix:  prefix,
					Unit:    t.Unit,
				}
			case StorageResource:
				avail, prefix := FormatNumber(t.Total.Avail*t.Multiplier, t.Base)
				account.Resources[k] = ResourceChart{
					Type:    t.Type,
					Display: t.Display,
					Name:    t.Name,
					Used:    t.Total.Used,
					Max:     t.Total.Max,
					Avail:   avail,
					Prefix:  prefix,
					Unit:    t.Unit,
				}
			case ListResource:
				l := struct {
					Type      string
					Display   bool
					Resources []ResourceChart
				}{
					Type:      t.Type,
					Display:   t.Display,
					Resources: []ResourceChart{},
				}

				for _, r := range t.Total {
					l.Resources = append(l.Resources, ResourceChart{
						Type:    t.Type,
						Display: t.Display,
						Name:    r.Name,
						Used:    r.Used,
						Max:     r.Max,
						Avail:   float64(r.Avail), // usually an int
						Unit:    "",
					})
				}
				account.Resources[k] = l
			}
		}

		c.HTML(http.StatusOK, "html/account.html", gin.H{
			"global":  common.Global,
			"page":    "account",
			"account": account,
		})
	} else {
		c.Redirect(http.StatusFound, "/login") // if user is not authed, redirect user to login page
	}
}

func GetUserAccount(auth common.Auth) (Account, error) {
	account := Account{
		Resources: map[string]any{},
	}

	ctx := common.RequestContext{
		Cookies: map[string]string{
			"username":            auth.Username,
			"PVEAuthCookie":       auth.Token,
			"CSRFPreventionToken": auth.CSRF,
		},
		Body: map[string]any{},
	}

	// get user account basic data
	res, code, err := common.RequestGetAPI("/user/config/cluster", ctx)
	if err != nil {
		return account, err
	}
	if code != 200 {
		return account, fmt.Errorf("request to /user/config/cluster resulted in %+v", res)
	}
	err = mapstructure.Decode(ctx.Body, &account)
	if err != nil {
		return account, err
	} else {
		account.Username = auth.Username
	}

	ctx.Body = map[string]any{}
	// get user resources
	res, code, err = common.RequestGetAPI("/user/dynamic/resources", ctx)
	if err != nil {
		return account, err
	}
	if code != 200 {
		return account, fmt.Errorf("request to /user/dynamic/resources resulted in %+v", res)
	}
	resources := ctx.Body

	ctx.Body = map[string]any{}
	// get resource meta data
	res, code, err = common.RequestGetAPI("/global/config/resources", ctx)
	if err != nil {
		return account, err
	}
	if code != 200 {
		return account, fmt.Errorf("request to /global/config/resources resulted in %+v", res)
	}
	meta := ctx.Body["resources"].(map[string]any)

	// build each resource by its meta type
	for k, v := range meta {
		m := v.(map[string]any)
		t := m["type"].(string)
		r := resources[k].(map[string]any)
		if t == "numeric" {
			n := NumericResource{}
			n.Type = t
			err_m := mapstructure.Decode(m, &n)
			err_r := mapstructure.Decode(r, &n)
			if err_m != nil || err_r != nil {
				return account, fmt.Errorf("%s\n%s", err_m.Error(), err_r.Error())
			}
			account.Resources[k] = n
		} else if t == "storage" {
			n := StorageResource{}
			n.Type = t
			err_m := mapstructure.Decode(m, &n)
			err_r := mapstructure.Decode(r, &n)
			if err_m != nil || err_r != nil {
				return account, fmt.Errorf("%s\n%s", err_m.Error(), err_r.Error())
			}
			account.Resources[k] = n
		} else if t == "list" {
			n := ListResource{}
			n.Type = t
			err_m := mapstructure.Decode(m, &n)
			err_r := mapstructure.Decode(r, &n)
			if err_m != nil || err_r != nil {
				return account, fmt.Errorf("%s\n%s", err_m.Error(), err_r.Error())
			}
			account.Resources[k] = n
		}
	}

	return account, nil
}

func FormatNumber(val int64, base int64) (float64, string) {
	valf := float64(val)
	basef := float64(base)
	steps := 0
	for math.Abs(valf) > basef && steps < 4 {
		valf /= basef
		steps++
	}

	if base == 1000 {
		prefixes := []string{"", "K", "M", "G", "T"}
		return valf, prefixes[steps]
	} else if base == 1024 {
		prefixes := []string{"", "Ki", "Mi", "Gi", "Ti"}
		return valf, prefixes[steps]
	} else {
		return 0, ""
	}
}