package api

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strings"

	"git.hatecomputers.club/hatecomputers/hatecomputers.club/database"
	"git.hatecomputers.club/hatecomputers/hatecomputers.club/utils"
)

type HcaptchaArgs struct {
	SiteKey string
}

func validateGuestbookEntry(entry *database.GuestbookEntry) []string {
	errors := []string{}

	if entry.Name == "" {
		errors = append(errors, "name is required")
	}

	if entry.Message == "" {
		errors = append(errors, "message is required")
	}

	messageLength := len(entry.Message)
	if messageLength > 500 {
		errors = append(errors, "message cannot be longer than 500 characters")
	}

	newLines := strings.Count(entry.Message, "\n")
	if newLines > 10 {
		errors = append(errors, "message cannot contain more than 10 new lines")
	}

	return errors
}

func SignGuestbookContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
	return func(success Continuation, failure Continuation) ContinuationChain {
		name := req.FormValue("name")
		message := req.FormValue("message")
		hCaptchaResponse := req.FormValue("h-captcha-response")

		formErrors := FormError{
			Errors: []string{},
		}

		if hCaptchaResponse == "" {
			formErrors.Errors = append(formErrors.Errors, "hCaptcha is required")
		}

		entry := &database.GuestbookEntry{
			ID:      utils.RandomId(),
			Name:    name,
			Message: message,
		}
		formErrors.Errors = append(formErrors.Errors, validateGuestbookEntry(entry)...)

		err := verifyHCaptcha(context.Args.HcaptchaSecret, hCaptchaResponse)
		if err != nil {
			log.Println(err)

			formErrors.Errors = append(formErrors.Errors, "hCaptcha verification failed")
		}
		if len(formErrors.Errors) > 0 {
			(*context.TemplateData)["FormError"] = formErrors
			(*context.TemplateData)["EntryForm"] = entry
			return failure(context, req, resp)
		}

		_, err = database.SaveGuestbookEntry(context.DBConn, entry)
		if err != nil {
			log.Println(err)
			resp.WriteHeader(http.StatusInternalServerError)
			return failure(context, req, resp)
		}

		return success(context, req, resp)
	}
}

func ListGuestbookContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
	return func(success Continuation, failure Continuation) ContinuationChain {
		entries, err := database.GetGuestbookEntries(context.DBConn)
		if err != nil {
			log.Println(err)
			resp.WriteHeader(http.StatusInternalServerError)
			return failure(context, req, resp)
		}

		(*context.TemplateData)["GuestbookEntries"] = entries
		return success(context, req, resp)
	}
}

func HcaptchaArgsContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
	return func(success Continuation, failure Continuation) ContinuationChain {
		(*context.TemplateData)["HcaptchaArgs"] = HcaptchaArgs{
			SiteKey: context.Args.HcaptchaSiteKey,
		}
		log.Println(context.Args.HcaptchaSiteKey)
		return success(context, req, resp)
	}
}

func verifyHCaptcha(secret, response string) error {
	verifyURL := "https://hcaptcha.com/siteverify"
	body := strings.NewReader("secret=" + secret + "&response=" + response)

	req, err := http.NewRequest("POST", verifyURL, body)
	if err != nil {
		return err
	}

	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		return err
	}

	jsonResponse := struct {
		Success bool `json:"success"`
	}{}
	err = json.NewDecoder(resp.Body).Decode(&jsonResponse)
	if err != nil {
		return err
	}

	if !jsonResponse.Success {
		return fmt.Errorf("hcaptcha verification failed")
	}

	defer resp.Body.Close()
	return nil
}