package handlers

import (
	"bytes"
	"encoding/base64"
	"image/png"
	"log"
	"os"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/golang-jwt/jwt/v5"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/pquerna/otp/totp"
	"golang.org/x/crypto/scrypt"
	"nim.jasinco.work/app/internal"
	"nim.jasinco.work/app/nimdb"
)

type NewAdmin struct {
	Name        string `json:"name"`
	Password    string `json:"password"`
	TOTP_Secret string `json:"totp_secret"`
}
type AdminAuth struct {
	Name      string `json:"name"`
	Password  string `json:"password"`
	TOTP_code string `json:"totp_code"`
}

func Admin_create(c *fiber.Ctx) error {
	cfg := new(NewAdmin)
	if err := c.BodyParser(cfg); err != nil {
		return fiber.ErrBadRequest
	}

	hashed, err := scrypt.Key([]byte(cfg.Password), []byte(internal.SALT), 32768, 8, 1, 32)
	if err != nil {
		return c.SendStatus(fiber.StatusInternalServerError)
	}

	err = internal.NIMDB.AdminCreateAccount(c.Context(), nimdb.AdminCreateAccountParams{Username: cfg.Name, Password: base64.StdEncoding.EncodeToString(hashed), Totp: cfg.TOTP_Secret})
	if err != nil {
		log.Println(base64.StdEncoding.EncodeToString(hashed), err)
		return c.SendStatus(fiber.StatusBadRequest)
	}

	return c.SendStatus(fiber.StatusCreated)
}

func Admin_new_totp_code(c *fiber.Ctx) error {
	name := c.Query("name")
	if len(name) == 0 {
		return fiber.ErrBadRequest
	}
	key, err := totp.Generate(totp.GenerateOpts{Issuer: "TCIVS_NIMING", AccountName: name})
	if err != nil {
		return fiber.ErrInternalServerError
	}
	var buf bytes.Buffer
	img, err := key.Image(200, 200)
	png.Encode(&buf, img)
	return c.JSON(fiber.Map{"key": key.Secret(), "img": base64.StdEncoding.EncodeToString(buf.Bytes())})
}

func Admin_Login(c *fiber.Ctx) error {
	cred := new(AdminAuth)

	if err := c.BodyParser(cred); err != nil {
		return fiber.ErrBadRequest
	}
	hashed, err := scrypt.Key([]byte(cred.Password), []byte(internal.SALT), 32768, 8, 1, 32)
	if err != nil {
		return c.SendStatus(fiber.StatusInternalServerError)
	}

	rec, err := internal.NIMDB.AdminLoginGetTOTP(c.Context(), nimdb.AdminLoginGetTOTPParams{Username: cred.Name, Password: base64.StdEncoding.EncodeToString(hashed)})

	if err != nil {
		log.Println(err)
		return c.SendStatus(fiber.StatusUnauthorized)
	}
	if !totp.Validate(cred.TOTP_code, rec.Totp) {
		log.Println(totp.GenerateCode(rec.Totp, time.Now()))
		return c.SendStatus(fiber.StatusUnauthorized)
	}

	claims := jwt.MapClaims{"name": cred.Name, "admin": rec.Super}
	token := jwt.NewWithClaims(jwt.SigningMethodHS512, claims)
	t, err := token.SignedString([]byte(internal.JWT_SECRET))
	if err != nil {
		return c.SendStatus(fiber.StatusInternalServerError)
	}
	cookie := new(fiber.Cookie)
	cookie.Name = "token"
	cookie.Value = t
	cookie.Expires = time.Now().Add(5 * time.Hour)
	c.Cookie(cookie)
	return c.JSON(fiber.Map{"token": t})
}

func Admin_Fetch_Post(c *fiber.Ctx) error {
	user := c.Locals("user").(*jwt.Token)
	claims := user.Claims.(jwt.MapClaims)
	super := claims["admin"].(bool)
	ctx := c.Context()
	if !super {
		rec, err := internal.NIMDB.AdminGetPost(ctx)
		if err != nil {

			return c.SendStatus(fiber.StatusInternalServerError)
		}
		type recwithimg struct {
			Id       int32       `json:"id"`
			Content  string      `json:"content"`
			Signing  pgtype.Text `json:"signing"`
			Post_at  time.Time   `json:"post_at"`
			Enclosue []string    `json:"enclosure"`
		}
		rec_with_img := make([]recwithimg, len(rec))
		for id, k := range rec {
			rec_with_img[id] = recwithimg{Id: k.ID, Content: k.Content, Signing: k.Signing, Post_at: k.PostAt.Time}
			imgrec, err := internal.NIMDB.AdminGetMedia(ctx, pgtype.Int4{Int32: k.ID, Valid: true})
			if err != nil {
				return c.SendStatus(fiber.StatusInternalServerError)
			}
			rec_with_img[id].Enclosue = imgrec
		}
		return c.JSON(rec_with_img)
	} else {

		rec, err := internal.NIMDB.SuperAdminGetPost(ctx)
		if err != nil {

			return c.SendStatus(fiber.StatusInternalServerError)
		}
		type recwithimg struct {
			Id       int32           `json:"id"`
			Content  string          `json:"content"`
			Signing  pgtype.Text     `json:"signing"`
			Post_at  time.Time       `json:"post_at"`
			Enclosue []string        `json:"enclosure"`
			Phase    nimdb.PostPhase `json:"phase"`
		}
		rec_with_img := make([]recwithimg, len(rec))
		for id, k := range rec {
			rec_with_img[id] = recwithimg{Id: k.ID, Content: k.Content, Signing: k.Signing, Post_at: k.PostAt.Time, Phase: k.Phase}
			imgrec, err := internal.NIMDB.AdminGetMedia(ctx, pgtype.Int4{Int32: k.ID, Valid: true})
			if err != nil {
				return c.SendStatus(fiber.StatusInternalServerError)
			}
			rec_with_img[id].Enclosue = imgrec
		}
		return c.JSON(rec_with_img)
	}

}

type Verify struct {
	Id    int32 `json:"post"`
	Check bool  `json:"check"`
}

func AdminVerify(c *fiber.Ctx) error {
	user := c.Locals("user").(*jwt.Token)
	claims := user.Claims.(jwt.MapClaims)
	super := claims["admin"].(bool)
	ctx := c.Context()
	tx, err := internal.POOL.Begin(ctx)
	defer tx.Rollback(ctx)
	if err != nil {
		return c.SendStatus(fiber.StatusInternalServerError)
	}
	qtx := internal.NIMDB.WithTx(tx)
	post_verify := new(Verify)
	log.Println(string(c.Body()))
	if err = c.BodyParser(post_verify); err != nil {
		return c.SendStatus(fiber.StatusBadRequest)
	}

	if !super {
		if post_verify.Check {
			_, err = qtx.AdminVerify(ctx, nimdb.AdminVerifyParams{ID: post_verify.Id, Phase: nimdb.PostPhaseOk})

		} else {
			_, err = qtx.AdminVerify(ctx, nimdb.AdminVerifyParams{ID: post_verify.Id, Phase: nimdb.PostPhaseRejected})
		}
		if err != nil {
			log.Println(err.Error())
			return c.SendStatus(fiber.StatusBadRequest)
		}
	} else {
		if post_verify.Check {
			_, err = qtx.SuperAdminVerify(ctx, nimdb.SuperAdminVerifyParams{ID: post_verify.Id, Phase: nimdb.PostPhaseOk})

		} else {
			_, err = qtx.SuperAdminVerify(ctx, nimdb.SuperAdminVerifyParams{ID: post_verify.Id, Phase: nimdb.PostPhaseAdminRejected})
		}
		if err != nil {
			log.Println(err.Error())
			return c.SendStatus(fiber.StatusBadRequest)
		}

	}

	err = qtx.AdminUpdateImage(ctx, pgtype.Int4{Int32: post_verify.Id, Valid: true})
	if err != nil {
		return c.SendStatus(fiber.StatusInternalServerError)
	}

	return tx.Commit(ctx)

}