package repository

import (
	"backend/pkg/library/errs"
	"backend/pkg/permission/domain/entity"
	"backend/pkg/permission/domain/repository"
	"context"
	"github.com/zeromicro/go-zero/core/stores/redis"
	"strings"
	"time"
)

// Token Repository Implementation

type TokenRepositoryParam struct {
	Redis *redis.Redis
}

type TokenRepository struct {
	Redis *redis.Redis
}

// NewTokenRepository 創建令牌倉庫實例
func NewTokenRepository(param TokenRepositoryParam) repository.TokenRepository {
	return &TokenRepository{
		Redis: param.Redis,
	}
}

func (r *TokenRepository) Create(ctx context.Context, token *entity.Token) error {
	// 驗證數據
	if err := token.Validate(); err != nil {
		return errs.InvalidFormat(err.Error())
	}

	token.CreateTime = time.Now()
	token.UpdateTime = time.Now()

	// 在 Redis 中存儲 access token
	accessKey := "token:access:" + token.AccessToken
	refreshKey := "token:refresh:" + token.RefreshToken

	// 設置過期時間
	expiry := int(time.Until(token.ExpiresAt).Seconds())
	if expiry <= 0 {
		return errs.InvalidFormat("token already expired")
	}

	// 存儲 access token
	err := r.Redis.SetexCtx(ctx, accessKey, token.UID+":"+token.ClientID+":"+token.DeviceID, expiry)
	if err != nil {
		return errs.DatabaseErr(err.Error())
	}

	// 存儲 refresh token (較長的過期時間)
	refreshExpiry := expiry * 7 // refresh token 過期時間是 access token 的 7 倍
	err = r.Redis.SetexCtx(ctx, refreshKey, token.UID+":"+token.ClientID+":"+token.DeviceID, refreshExpiry)
	if err != nil {
		return errs.DatabaseErr(err.Error())
	}

	return nil
}

func (r *TokenRepository) GetByAccessToken(ctx context.Context, accessToken string) (*entity.Token, error) {
	key := "token:access:" + accessToken
	value, err := r.Redis.GetCtx(ctx, key)
	if err != nil {
		if err == redis.Nil {
			return nil, errs.NotFound("access_token")
		}
		return nil, errs.DatabaseErr(err.Error())
	}

	// 解析值
	parts := strings.Split(value, ":")
	if len(parts) != 3 {
		return nil, errs.InvalidFormat("invalid token format")
	}

	return &entity.Token{
		UID:         parts[0],
		ClientID:    parts[1],
		DeviceID:    parts[2],
		AccessToken: accessToken,
	}, nil
}

func (r *TokenRepository) GetByRefreshToken(ctx context.Context, refreshToken string) (*entity.Token, error) {
	key := "token:refresh:" + refreshToken
	value, err := r.Redis.GetCtx(ctx, key)
	if err != nil {
		if err == redis.Nil {
			return nil, errs.NotFound("refresh_token")
		}
		return nil, errs.DatabaseErr(err.Error())
	}

	// 解析值
	parts := strings.Split(value, ":")
	if len(parts) != 3 {
		return nil, errs.InvalidFormat("invalid token format")
	}

	return &entity.Token{
		UID:          parts[0],
		ClientID:     parts[1],
		DeviceID:     parts[2],
		RefreshToken: refreshToken,
	}, nil
}

func (r *TokenRepository) Update(ctx context.Context, token *entity.Token) error {
	// 驗證數據
	if err := token.Validate(); err != nil {
		return errs.InvalidFormat(err.Error())
	}

	token.UpdateTime = time.Now()

	// 重新存儲 access token
	accessKey := "token:access:" + token.AccessToken
	expiry := int(time.Until(token.ExpiresAt).Seconds())
	if expiry <= 0 {
		return errs.InvalidFormat("token already expired")
	}

	err := r.Redis.SetexCtx(ctx, accessKey, token.UID+":"+token.ClientID+":"+token.DeviceID, expiry)
	if err != nil {
		return errs.DatabaseErr(err.Error())
	}

	return nil
}

func (r *TokenRepository) Delete(ctx context.Context, id bson.ObjectID) error {
	// Redis 版本不需要 ObjectID，這裡留空實現
	return nil
}

func (r *TokenRepository) DeleteByUserID(ctx context.Context, uid string) error {
	// 可以實現刪除用戶所有 token 的邏輯
	// 這裡簡化實現
	return nil
}