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// SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

package core

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

	"github.com/golang-jwt/jwt/v5"

	workspace "pocka.jp/x/yamori/proto/go/backend/projections/workspace/v1"

	"pocka.jp/x/yamori/backend/core/projection"
)

const cookieName = "yamori-login-token"

type token string

func (core *Core) LoadTokenFromCookie(header *http.Header) (*token, error) {
	for _, header := range header.Values("Cookie") {
		cookies, err := http.ParseCookie(header)
		if err != nil {
			return nil, err
		}

		for _, cookie := range cookies {
			if cookie.Name == cookieName {
				token := token(cookie.Value)
				return &token, nil
			}
		}
	}

	return nil, nil
}

func DeleteTokenFromCookie(header *http.Header) {
	cookie := http.Cookie{
		Name:     cookieName,
		Value:    "",
		Expires:  time.Now(),
		SameSite: http.SameSiteStrictMode,
		Secure:   true,
		HttpOnly: true,
	}

	header.Add("Set-Cookie", cookie.String())
}

func (core *Core) IssueToken(secret *projection.LoginJwtSecret, user *workspace.Users_User) (*token, error) {
	t := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
		"sub": user.GetId(),
	})

	signed, err := t.SignedString(secret.Projection)
	if err != nil {
		return nil, err
	}

	token := token(signed)
	return &token, nil
}

func (t *token) SaveToCookie(header *http.Header) {
	cookie := http.Cookie{
		Name:     cookieName,
		Value:    string(*t),
		SameSite: http.SameSiteStrictMode,
		Secure:   true,
		HttpOnly: true,
	}

	header.Add("Set-Cookie", cookie.String())
}

func (t *token) Validate(secret *projection.LoginJwtSecret) error {
	_, err := jwt.Parse(string(*t), func(token *jwt.Token) (any, error) {
		return secret.Projection, nil
	}, jwt.WithValidMethods([]string{jwt.SigningMethodHS256.Alg()}))

	return err
}

func (t *token) FindUser(
	secret *projection.LoginJwtSecret,
	users *projection.Users,
) (*workspace.Users_User, error) {
	parsed, err := jwt.Parse(string(*t), func(token *jwt.Token) (any, error) {
		return secret.Projection, nil
	}, jwt.WithValidMethods([]string{jwt.SigningMethodHS256.Alg()}))
	if err != nil {
		return nil, err
	}

	sub, err := parsed.Claims.GetSubject()
	if err != nil {
		return nil, err
	}

	for _, u := range users.Projection.Users {
		if u.GetId() == sub {
			return u, nil
		}
	}

	return nil, fmt.Errorf("No user found for sub=%s", sub)
}