package postgres

import (
	"context"
	"database/sql"
	"fmt"
	"time"

	"github.com/google/uuid"
	"github.com/ocdp/cluster-service/internal/domain/entity"
	"github.com/ocdp/cluster-service/internal/domain/repository"
)

// UserRepository PostgreSQL 用户仓储实现
type UserRepository struct {
	db *DB
}

// NewUserRepository 创建 PostgreSQL 用户仓储
func NewUserRepository(db *DB) repository.UserRepository {
	return &UserRepository{db: db}
}

// Create 创建用户
func (r *UserRepository) Create(ctx context.Context, user *entity.User) error {
	if user.ID == "" {
		user.ID = uuid.New().String()
	}

	query := `
		INSERT INTO users (id, username, password_hash, email, role, workspace_id, is_active, must_change_password, revoked_after, created_at, updated_at)
		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
	`

	_, err := r.db.conn.ExecContext(ctx, query,
		user.ID,
		user.Username,
		user.PasswordHash,
		user.Email,
		user.Role,
		user.WorkspaceID,
		user.IsActive,
		user.MustChangePassword,
		user.RevokedAfter,
		user.CreatedAt,
		user.UpdatedAt,
	)

	if err != nil {
		return fmt.Errorf("failed to create user: %w", err)
	}

	return nil
}

// GetByID 根据 ID 获取用户
func (r *UserRepository) GetByID(ctx context.Context, id string) (*entity.User, error) {
	query := `
		SELECT id, username, password_hash, email, role, workspace_id, is_active, must_change_password, revoked_after, created_at, updated_at
		FROM users
		WHERE id = $1
	`

	user := &entity.User{}
	err := r.db.conn.QueryRowContext(ctx, query, id).Scan(
		&user.ID,
		&user.Username,
		&user.PasswordHash,
		&user.Email,
		&user.Role,
		&user.WorkspaceID,
		&user.IsActive,
		&user.MustChangePassword,
		&user.RevokedAfter,
		&user.CreatedAt,
		&user.UpdatedAt,
	)

	if err == sql.ErrNoRows {
		return nil, entity.ErrUserNotFound
	}
	if err != nil {
		return nil, fmt.Errorf("failed to get user: %w", err)
	}

	return user, nil
}

// GetByUsername 根据用户名获取用户
func (r *UserRepository) GetByUsername(ctx context.Context, username string) (*entity.User, error) {
	query := `
		SELECT id, username, password_hash, email, role, workspace_id, is_active, must_change_password, revoked_after, created_at, updated_at
		FROM users
		WHERE username = $1
	`

	user := &entity.User{}
	err := r.db.conn.QueryRowContext(ctx, query, username).Scan(
		&user.ID,
		&user.Username,
		&user.PasswordHash,
		&user.Email,
		&user.Role,
		&user.WorkspaceID,
		&user.IsActive,
		&user.MustChangePassword,
		&user.RevokedAfter,
		&user.CreatedAt,
		&user.UpdatedAt,
	)

	if err == sql.ErrNoRows {
		return nil, entity.ErrUserNotFound
	}
	if err != nil {
		return nil, fmt.Errorf("failed to get user: %w", err)
	}

	return user, nil
}

// Update 更新用户
func (r *UserRepository) Update(ctx context.Context, user *entity.User) error {
	user.UpdatedAt = time.Now()

	query := `
		UPDATE users
		SET username = $1, password_hash = $2, email = $3, role = $4, workspace_id = $5,
		    is_active = $6, must_change_password = $7, revoked_after = $8, updated_at = $9
		WHERE id = $10
	`

	result, err := r.db.conn.ExecContext(ctx, query,
		user.Username,
		user.PasswordHash,
		user.Email,
		user.Role,
		user.WorkspaceID,
		user.IsActive,
		user.MustChangePassword,
		user.RevokedAfter,
		user.UpdatedAt,
		user.ID,
	)

	if err != nil {
		return fmt.Errorf("failed to update user: %w", err)
	}

	rows, err := result.RowsAffected()
	if err != nil {
		return fmt.Errorf("failed to get affected rows: %w", err)
	}

	if rows == 0 {
		return entity.ErrUserNotFound
	}

	return nil
}

// Delete 删除用户
func (r *UserRepository) Delete(ctx context.Context, id string) error {
	query := `DELETE FROM users WHERE id = $1`

	result, err := r.db.conn.ExecContext(ctx, query, id)
	if err != nil {
		return fmt.Errorf("failed to delete user: %w", err)
	}

	rows, err := result.RowsAffected()
	if err != nil {
		return fmt.Errorf("failed to get affected rows: %w", err)
	}

	if rows == 0 {
		return entity.ErrUserNotFound
	}

	return nil
}

// List 列出所有用户
func (r *UserRepository) List(ctx context.Context) ([]*entity.User, error) {
	query := `
		SELECT id, username, password_hash, email, role, workspace_id, is_active, must_change_password, revoked_after, created_at, updated_at
		FROM users
		ORDER BY created_at DESC
	`

	rows, err := r.db.conn.QueryContext(ctx, query)
	if err != nil {
		return nil, fmt.Errorf("failed to list users: %w", err)
	}
	defer rows.Close()

	users := make([]*entity.User, 0)
	for rows.Next() {
		user := &entity.User{}
		err := rows.Scan(
			&user.ID,
			&user.Username,
			&user.PasswordHash,
			&user.Email,
			&user.Role,
			&user.WorkspaceID,
			&user.IsActive,
			&user.MustChangePassword,
			&user.RevokedAfter,
			&user.CreatedAt,
			&user.UpdatedAt,
		)
		if err != nil {
			return nil, fmt.Errorf("failed to scan user: %w", err)
		}
		users = append(users, user)
	}

	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("rows iteration error: %w", err)
	}

	return users, nil
}