package handlers

import (
    "net/http"
    "strings"

    "github.com/dchest/captcha"
    "github.com/gin-gonic/gin"

    "go-dy/internal/config"
    dbpkg "go-dy/internal/db"
    "go-dy/internal/repo"
    "go-dy/internal/resp"
)

func RegisterHandler(cfg config.Config) gin.HandlerFunc {
    return func(c *gin.Context) {
        if !cfg.AllowRegistration {
            resp.Error(c, http.StatusForbidden, "registration disabled")
            return
        }
        name := strings.TrimSpace(c.PostForm("name"))
        password := c.PostForm("password")
        confirm := c.PostForm("confirm_password")
        captchaID := c.PostForm("captcha_id")
        captchaCode := c.PostForm("captcha_code")
        if cfg.RegisterRequireCaptcha {
            if name == "" || password == "" || confirm == "" || captchaID == "" || captchaCode == "" {
                resp.Error(c, http.StatusBadRequest, "missing fields: name/password/confirm/captcha")
                return
            }
        } else {
            if name == "" || password == "" || confirm == "" {
                resp.Error(c, http.StatusBadRequest, "missing fields: name/password/confirm")
                return
            }
        }
        if password != confirm {
            resp.Error(c, http.StatusBadRequest, "passwords do not match")
            return
        }
        if cfg.RegisterRequireCaptcha {
            if !captcha.VerifyString(captchaID, captchaCode) {
                resp.Error(c, http.StatusBadRequest, "invalid captcha")
                return
            }
        }
        db, err := dbpkg.Get(cfg)
        if err != nil {
            resp.Error(c, http.StatusInternalServerError, "database not available")
            return
        }
        existing, err := repo.GetUserByName(db, name)
        if err != nil {
            resp.Error(c, http.StatusInternalServerError, "database error")
            return
        }
        if existing != nil {
            resp.Error(c, http.StatusBadRequest, "user already exists")
            return
        }
        if err := repo.CreateUser(db, name, password); err != nil {
            resp.Error(c, http.StatusInternalServerError, "create user failed")
            return
        }
        resp.OK(c, gin.H{"username": name})
    }
}