package generation

import (
	"chat/auth"
	"chat/globals"
	"chat/utils"
	"fmt"
	"strings"

	"github.com/gin-gonic/gin"
)

type WebsocketGenerationForm struct {
	Token  string `json:"token" binding:"required"`
	Prompt string `json:"prompt" binding:"required"`
	Model  string `json:"model" binding:"required"`
}

func ProjectTarDownloadAPI(c *gin.Context) {
	hash := strings.TrimSpace(c.Query("hash"))
	c.Writer.Header().Add("Content-Disposition", "attachment; filename=code.tar.gz")
	c.File(fmt.Sprintf("storage/generation/%s.tar.gz", hash))
}

func ProjectZipDownloadAPI(c *gin.Context) {
	hash := strings.TrimSpace(c.Query("hash"))
	c.Writer.Header().Add("Content-Disposition", "attachment; filename=code.zip")
	c.File(fmt.Sprintf("storage/generation/%s.zip", hash))
}

func GenerateAPI(c *gin.Context) {
	var conn *utils.WebSocket
	if conn = utils.NewWebsocket(c, false); conn == nil {
		return
	}
	defer conn.DeferClose()

	form, err := utils.ReadForm[WebsocketGenerationForm](conn)
	if err != nil {
		return
	}

	user := auth.ParseToken(c, form.Token)

	db := utils.GetDBFromContext(c)
	cache := utils.GetCacheFromContext(c)

	if !auth.HitGroups(db, user, globals.GenerationPermissionGroup) {
		conn.Send(globals.GenerationSegmentResponse{
			Message: "permission denied",
			Quota:   0,
			End:     true,
		})
		return
	}

	check, plan := auth.CanEnableModelWithSubscription(db, cache, user, form.Model, []globals.Message{})
	if check != nil {
		conn.Send(globals.GenerationSegmentResponse{
			Message: check.Error(),
			Quota:   0,
			End:     true,
		})
		return
	}

	var instance *utils.Buffer
	hash, err := CreateGenerationWithCache(
		auth.GetGroup(db, user),
		form.Model,
		form.Prompt,
		func(buffer *utils.Buffer, data string) {
			instance = buffer
			conn.Send(globals.GenerationSegmentResponse{
				End:     false,
				Message: data,
				Quota:   buffer.GetQuota(),
			})
		},
	)

	if instance != nil && !plan && instance.GetQuota() > 0 && user != nil {
		user.UseQuota(db, instance.GetQuota())
	}

	if err != nil {
		auth.RevertSubscriptionUsage(db, cache, user, form.Model)
		conn.Send(globals.GenerationSegmentResponse{
			End:   true,
			Error: err.Error(),
			Quota: instance.GetQuota(),
		})
		return
	}

	conn.Send(globals.GenerationSegmentResponse{
		End:   true,
		Hash:  hash,
		Quota: instance.GetQuota(),
	})
}