package admin

import (
	"fmt"
	"net/http"
	"os"
	"time"

	"arimelody-web/controller"
	"arimelody-web/model"

	"golang.org/x/crypto/bcrypt"
)

func accountHandler(app *model.AppState) http.Handler {
    mux := http.NewServeMux()

    mux.Handle("/password", changePasswordHandler(app))
    mux.Handle("/delete", deleteAccountHandler(app))
    mux.Handle("/", accountIndexHandler(app))

    return mux
}

func accountIndexHandler(app *model.AppState) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        session := r.Context().Value("session").(*model.Session)

        totps, err := controller.GetTOTPsForAccount(app.DB, session.Account.ID)
        if err != nil {
            fmt.Printf("WARN: Failed to fetch TOTPs: %v\n", err)
            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
        }

        type accountResponse struct {
            Session *model.Session
            TOTPs []model.TOTP
        }

        err = pages["account"].Execute(w, accountResponse{
            Session: session,
            TOTPs: totps,
        })
        if err != nil {
            fmt.Printf("WARN: Failed to render admin account page: %v\n", err)
            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
        }
    })
}

func changePasswordHandler(app *model.AppState) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        if r.Method != http.MethodPost {
            http.NotFound(w, r)
            return
        }

        session := r.Context().Value("session").(*model.Session)

        r.ParseForm()

        currentPassword := r.Form.Get("current-password")
        if err := bcrypt.CompareHashAndPassword([]byte(session.Account.Password), []byte(currentPassword)); err != nil {
            controller.SetSessionMessage(app.DB, session, "Incorrect password.")
            http.Redirect(w, r, "/admin/account", http.StatusFound)
            return
        }

        newPassword := r.Form.Get("new-password")

        controller.SetSessionMessage(app.DB, session, fmt.Sprintf("Updating password to <code>%s</code>", newPassword))
        http.Redirect(w, r, "/admin/account", http.StatusFound)
    })
}

func deleteAccountHandler(app *model.AppState) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        if r.Method != http.MethodPost {
            http.NotFound(w, r)
            return
        }

        err := r.ParseForm()
        if err != nil {
            http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
            return
        }

        if !r.Form.Has("password") || !r.Form.Has("totp") {
            http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
            return
        }

        session := r.Context().Value("session").(*model.Session)

        // check password
        if err := bcrypt.CompareHashAndPassword([]byte(session.Account.Password), []byte(r.Form.Get("password"))); err != nil {
            fmt.Printf(
                "[%s] WARN: Account \"%s\" attempted account deletion with incorrect password.\n",
                time.Now().Format("2006-02-01 15:04:05"),
                session.Account.Username,
            )
            controller.SetSessionMessage(app.DB, session, "Incorrect password.")
            http.Redirect(w, r, "/admin/account", http.StatusFound)
            return
        }

        totpMethod, err := controller.CheckTOTPForAccount(app.DB, session.Account.ID, r.Form.Get("totp"))
        if err != nil {
            fmt.Fprintf(os.Stderr, "Failed to fetch account: %v\n", err)
            controller.SetSessionMessage(app.DB, session, "Something went wrong. Please try again.")
            http.Redirect(w, r, "/admin/account", http.StatusFound)
            return
        }
        if totpMethod == nil {
            fmt.Printf(
                "[%s] WARN: Account \"%s\" attempted account deletion with incorrect TOTP.\n",
                time.Now().Format("2006-02-01 15:04:05"),
                session.Account.Username,
            )
            controller.SetSessionMessage(app.DB, session, "Incorrect TOTP.")
            http.Redirect(w, r, "/admin/account", http.StatusFound)
        }

        err = controller.DeleteAccount(app.DB, session.Account.ID)
        if err != nil {
            fmt.Fprintf(os.Stderr, "Failed to delete account: %v\n", err)
            controller.SetSessionMessage(app.DB, session, "Something went wrong. Please try again.")
            http.Redirect(w, r, "/admin/account", http.StatusFound)
            return
        }

        fmt.Printf(
            "[%s] INFO: Account \"%s\" deleted by user request.\n",
            time.Now().Format("2006-02-01 15:04:05"),
            session.Account.Username,
        )

        session.Account = nil
        controller.SetSessionMessage(app.DB, session, "Account deleted successfully.")
        http.Redirect(w, r, "/admin/login", http.StatusFound)
    })
}