package handlers

import (
	"fmt"
	"net/http"
	"strings"

	"veola/internal/auth"
	"veola/internal/models"
	"veola/templates"
)

func (a *App) renderSettingsWithUserMsg(w http.ResponseWriter, r *http.Request, msg, errMsg string) {
	d, err := a.settingsData(r)
	if err != nil {
		a.serverError(w, r, err)
		return
	}
	d.UserMsg = msg
	d.UserError = errMsg
	render(w, r, templates.Settings(d))
}

func (a *App) PostCreateUser(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		http.Error(w, "bad form", http.StatusBadRequest)
		return
	}
	username := strings.TrimSpace(r.PostFormValue("username"))
	password := r.PostFormValue("password")
	role := strings.TrimSpace(r.PostFormValue("role"))
	if role != string(models.RoleAdmin) {
		role = string(models.RoleUser)
	}

	switch {
	case username == "":
		a.renderSettingsWithUserMsg(w, r, "", "Username is required")
		return
	case len(password) < auth.MinPasswordLen:
		a.renderSettingsWithUserMsg(w, r, "", fmt.Sprintf("Password must be at least %d characters", auth.MinPasswordLen))
		return
	}
	existing, _ := a.Store.GetUserByUsername(r.Context(), username)
	if existing != nil {
		a.renderSettingsWithUserMsg(w, r, "", "User already exists")
		return
	}
	hash, err := auth.HashPassword(password)
	if err != nil {
		a.renderSettingsWithUserMsg(w, r, "", "hash error")
		return
	}
	if _, err := a.Store.CreateUser(r.Context(), username, hash, models.Role(role)); err != nil {
		a.renderSettingsWithUserMsg(w, r, "", err.Error())
		return
	}
	a.renderSettingsWithUserMsg(w, r, "Created user "+username, "")
}

func (a *App) PostDeleteUser(w http.ResponseWriter, r *http.Request) {
	id := intParam(r, "id")
	cur := auth.CurrentUserFromRequest(r)
	if cur != nil && cur.ID == id {
		a.renderSettingsWithUserMsg(w, r, "", "You cannot delete your own account")
		return
	}
	if err := a.Store.DeleteUser(r.Context(), id); err != nil {
		a.renderSettingsWithUserMsg(w, r, "", err.Error())
		return
	}
	a.renderSettingsWithUserMsg(w, r, "User removed", "")
}

func (a *App) PostResetPassword(w http.ResponseWriter, r *http.Request) {
	id := intParam(r, "id")
	if err := r.ParseForm(); err != nil {
		http.Error(w, "bad form", http.StatusBadRequest)
		return
	}
	next := r.PostFormValue("new_password")
	if len(next) < auth.MinPasswordLen {
		a.renderSettingsWithUserMsg(w, r, "", fmt.Sprintf("Password must be at least %d characters", auth.MinPasswordLen))
		return
	}
	u, err := a.Store.GetUserByID(r.Context(), id)
	if err != nil || u == nil {
		a.renderSettingsWithUserMsg(w, r, "", "User not found")
		return
	}
	hash, err := auth.HashPassword(next)
	if err != nil {
		a.renderSettingsWithUserMsg(w, r, "", "hash error")
		return
	}
	if err := a.Store.UpdateUserPassword(r.Context(), id, hash); err != nil {
		a.renderSettingsWithUserMsg(w, r, "", err.Error())
		return
	}
	a.renderSettingsWithUserMsg(w, r, "Password reset for "+u.Username, "")
}