package repository

import (
	"context"
	"time"

	"carrotskin/internal/model"

	"gorm.io/gorm"
)

// FriendRepository 好友/屏蔽关系仓储接口
type FriendRepository interface {
	// Create 创建好友/屏蔽关系记录
	Create(ctx context.Context, friend *model.Friend) error
	// FindRelation 查询 requester->target 方向的关系记录
	FindRelation(ctx context.Context, requesterUUID, targetUUID string) (*model.Friend, error)
	// ListAccepted 返回与 uuid 已互为好友的对端 UUID 集合
	// （合并 requester 与 target 两个方向 status=accepted 的记录）
	ListAccepted(ctx context.Context, uuid string) ([]string, error)
	// ListIncoming 返回收到的 pending 请求发起者 UUID 列表
	ListIncoming(ctx context.Context, uuid string) ([]string, error)
	// ListOutgoing 返回已发出的 pending 请求目标 UUID 列表
	ListOutgoing(ctx context.Context, uuid string) ([]string, error)
	// UpdateStatus 更新某条记录的状态
	UpdateStatus(ctx context.Context, id int64, status model.FriendsStatus) error
	// Delete 删除记录（物理删除，用于 remove/decline/revoke/unblock）
	Delete(ctx context.Context, id int64) error
	// ListBlocked 返回 blocker 屏蔽的 target UUID 列表
	ListBlocked(ctx context.Context, blockerUUID string) ([]string, error)
}

// PlayerAttributeRepository 玩家偏好属性仓储接口
type PlayerAttributeRepository interface {
	// Get 读取玩家偏好；不存在时返回 model.DefaultPlayerAttributes 的零值结构，错误为 nil
	Get(ctx context.Context, profileUUID string) (*model.PlayerAttributes, error)
	// Upsert 插入或更新玩家偏好
	Upsert(ctx context.Context, attr *model.PlayerAttributes) error
}

// friendRepository FriendRepository 的 GORM 实现
type friendRepository struct {
	db *gorm.DB
}

// NewFriendRepository 创建 FriendRepository 实例
func NewFriendRepository(db *gorm.DB) FriendRepository {
	return &friendRepository{db: db}
}

func (r *friendRepository) Create(ctx context.Context, friend *model.Friend) error {
	return r.db.WithContext(ctx).Create(friend).Error
}

func (r *friendRepository) FindRelation(ctx context.Context, requesterUUID, targetUUID string) (*model.Friend, error) {
	var f model.Friend
	err := r.db.WithContext(ctx).
		Where("requester_uuid = ? AND target_uuid = ?", requesterUUID, targetUUID).
		First(&f).Error
	return handleNotFoundResult(&f, err)
}

func (r *friendRepository) ListAccepted(ctx context.Context, uuid string) ([]string, error) {
	var records []model.Friend
	// requester 方向
	if err := r.db.WithContext(ctx).
		Select("target_uuid").
		Where("requester_uuid = ? AND status = ?", uuid, model.FriendsStatusAccepted).
		Find(&records).Error; err != nil {
		return nil, err
	}
	result := make([]string, 0, len(records))
	for _, r := range records {
		result = append(result, r.TargetUUID)
	}
	// target 方向
	records = records[:0]
	if err := r.db.WithContext(ctx).
		Select("requester_uuid").
		Where("target_uuid = ? AND status = ?", uuid, model.FriendsStatusAccepted).
		Find(&records).Error; err != nil {
		return nil, err
	}
	for _, r := range records {
		result = append(result, r.RequesterUUID)
	}
	return result, nil
}

func (r *friendRepository) ListIncoming(ctx context.Context, uuid string) ([]string, error) {
	var records []model.Friend
	err := r.db.WithContext(ctx).
		Select("requester_uuid").
		Where("target_uuid = ? AND status = ?", uuid, model.FriendsStatusPending).
		Find(&records).Error
	if err != nil {
		return nil, err
	}
	result := make([]string, 0, len(records))
	for _, r := range records {
		result = append(result, r.RequesterUUID)
	}
	return result, nil
}

func (r *friendRepository) ListOutgoing(ctx context.Context, uuid string) ([]string, error) {
	var records []model.Friend
	err := r.db.WithContext(ctx).
		Select("target_uuid").
		Where("requester_uuid = ? AND status = ?", uuid, model.FriendsStatusPending).
		Find(&records).Error
	if err != nil {
		return nil, err
	}
	result := make([]string, 0, len(records))
	for _, r := range records {
		result = append(result, r.TargetUUID)
	}
	return result, nil
}

func (r *friendRepository) UpdateStatus(ctx context.Context, id int64, status model.FriendsStatus) error {
	return r.db.WithContext(ctx).Model(&model.Friend{}).
		Where("id = ?", id).
		Update("status", status).Error
}

func (r *friendRepository) Delete(ctx context.Context, id int64) error {
	return r.db.WithContext(ctx).Delete(&model.Friend{}, id).Error
}

func (r *friendRepository) ListBlocked(ctx context.Context, blockerUUID string) ([]string, error) {
	var records []model.Friend
	err := r.db.WithContext(ctx).
		Select("target_uuid").
		Where("requester_uuid = ? AND status = ?", blockerUUID, model.FriendsStatusBlocked).
		Find(&records).Error
	if err != nil {
		return nil, err
	}
	result := make([]string, 0, len(records))
	for _, r := range records {
		result = append(result, r.TargetUUID)
	}
	return result, nil
}

// playerAttributeRepository PlayerAttributeRepository 的 GORM 实现
type playerAttributeRepository struct {
	db *gorm.DB
}

// NewPlayerAttributeRepository 创建 PlayerAttributeRepository 实例
func NewPlayerAttributeRepository(db *gorm.DB) PlayerAttributeRepository {
	return &playerAttributeRepository{db: db}
}

func (r *playerAttributeRepository) Get(ctx context.Context, profileUUID string) (*model.PlayerAttributes, error) {
	var attr model.PlayerAttributes
	err := r.db.WithContext(ctx).
		Where("profile_uuid = ?", profileUUID).
		First(&attr).Error
	if err != nil {
		if IsNotFound(err) {
			// 不存在时返回默认值
			d := model.DefaultPlayerAttributes(profileUUID)
			return &d, nil
		}
		return nil, err
	}
	return &attr, nil
}

func (r *playerAttributeRepository) Upsert(ctx context.Context, attr *model.PlayerAttributes) error {
	now := time.Now()
	attr.UpdatedAt = now
	// 用 map 显式写出所有字段，规避 gorm 对带 default 标签的零值布尔字段在 Create 时被忽略的问题
	fields := map[string]interface{}{
		"friends_enabled":      attr.FriendsEnabled,
		"accept_invites":       attr.AcceptInvites,
		"profanity_filter_on": attr.ProfanityFilterOn,
		"text_communication":  attr.TextCommunication,
		"updated_at":           now,
	}
	// 优先 UPDATE；若影响行数为 0（记录不存在）再 INSERT
	res := r.db.WithContext(ctx).Model(&model.PlayerAttributes{}).
		Where("profile_uuid = ?", attr.ProfileUUID).
		Updates(fields)
	if res.Error != nil {
		return res.Error
	}
	if res.RowsAffected > 0 {
		return nil
	}
	// 不存在 -> 插入；用 map 写入避免零值布尔被 default 覆盖
	createFields := map[string]interface{}{
		"profile_uuid":         attr.ProfileUUID,
		"friends_enabled":      attr.FriendsEnabled,
		"accept_invites":       attr.AcceptInvites,
		"profanity_filter_on": attr.ProfanityFilterOn,
		"text_communication":  attr.TextCommunication,
		"updated_at":           now,
		"created_at":           now,
	}
	if err := r.db.WithContext(ctx).Model(&model.PlayerAttributes{}).Create(createFields).Error; err != nil {
		// 并发情况下可能唯一键冲突，回退为更新一次
		return r.db.WithContext(ctx).Model(&model.PlayerAttributes{}).
			Where("profile_uuid = ?", attr.ProfileUUID).
			Updates(fields).Error
	}
	return nil
}