package service

import (
	"context"
	db "server/internal/db/sqlc"
	"server/internal/model/common"
	"server/internal/model/enum"
	"server/internal/model/request"
	"server/internal/pkg/cache"
	"server/internal/pkg/dberr"
	"server/internal/pkg/errs"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
)

type SysRoleService struct {
	queries *db.Queries
	pool    *pgxpool.Pool
	cache   *cache.Caches
}

func NewSysRoleService(queries *db.Queries, pool *pgxpool.Pool, cache *cache.Caches) *SysRoleService {
	return &SysRoleService{
		queries: queries,
		pool:    pool,
		cache:   cache,
	}
}

func (s *SysRoleService) ListPage(ctx context.Context, p *common.Pagination) ([]db.SysRole, int64, error) {
	params := db.ListSysRolesParams{
		Limit:  p.PageSize,
		Offset: (p.Page - 1) * p.PageSize,
	}

	total, err := s.queries.CountSysRoles(ctx)

	if err != nil {
		return nil, 0, err
	}

	list, err := s.queries.ListSysRoles(ctx, params)
	if err != nil {
		return nil, 0, err
	}

	return list, total, nil
}

func (s *SysRoleService) GetRoles(ctx context.Context) ([]db.SysRole, error) {
	return s.queries.GetAllSysRoles(ctx)
}

func (s *SysRoleService) GetRoleMenus(ctx context.Context, id int32) ([]db.GetSysRoleMenusRow, error) {
	_, err := s.queries.GetSysRoleByID(ctx, id)
	if err != nil {
		return nil, dberr.MapNoRows(err, errs.ErrSysRoleNotFound)
	}

	return s.queries.GetSysRoleMenus(ctx, id)
}

func (s *SysRoleService) GetRoleApis(ctx context.Context, id int32) ([]db.GetSysRoleApisRow, error) {
	_, err := s.queries.GetSysRoleByID(ctx, id)
	if err != nil {
		return nil, dberr.MapNoRows(err, errs.ErrSysRoleNotFound)
	}

	return s.queries.GetSysRoleApis(ctx, id)
}

func (s *SysRoleService) Create(ctx context.Context, req request.CreateSysRoleRequest) error {
	params := db.CreateSysRoleParams{
		Name: req.Name,
		Code: req.Code,
	}

	// 清理缓存
	s.cache.ClearAllSysUserCache()

	err := s.queries.CreateSysRole(ctx, params)
	if err != nil {
		return dberr.MapUniqueViolation(err, dberr.SysRoleCodeKey, errs.ErrCodeAlreadyExists)
	}
	return nil
}

func (s *SysRoleService) Update(ctx context.Context, id int32, req request.UpdateSysRoleRequest) error {
	params := db.UpdateSysRoleParams{
		ID:   id,
		Name: req.Name,
	}

	// 清理缓存
	s.cache.ClearAllSysUserCache()

	rows, err := s.queries.UpdateSysRole(ctx, params)
	return dberr.MapRowsAffected(rows, err, errs.ErrSysRoleNotFound)
}

func (s *SysRoleService) SetRoleMenus(ctx context.Context, roleID int32, req request.SetSysRoleMenusRequest) error {
	_, err := s.queries.GetSysRoleByID(ctx, roleID)
	if err != nil {
		return dberr.MapNoRows(err, errs.ErrSysRoleNotFound)
	}

	tx, err := s.pool.BeginTx(ctx, pgx.TxOptions{})
	if err != nil {
		return err
	}

	defer func(ctx context.Context) {
		_ = tx.Rollback(ctx)
	}(ctx)

	q := db.New(tx)

	permissionIds, err := s.queries.GetSysPermissionIdsByMenuIDs(ctx, req.MenuIDs)
	if err != nil {
		return err
	}

	params := make([]db.CreateSysRolePermissionParams, 0, len(permissionIds))
	for _, id := range permissionIds {
		params = append(params, db.CreateSysRolePermissionParams{
			RoleID:       roleID,
			PermissionID: id,
		})
	}

	if err = q.DeleteSysRolePermission(ctx, db.DeleteSysRolePermissionParams{
		RoleID: roleID,
		Type:   int16(enum.PermissionTypeMenu),
	}); err != nil {
		return err
	}

	_, err = q.CreateSysRolePermission(ctx, params)
	if err != nil {
		return err
	}

	if err = tx.Commit(ctx); err != nil {
		return err
	}

	// 清理缓存
	s.cache.ClearAllSysUserCache()

	return err
}

func (s *SysRoleService) SetRoleApis(ctx context.Context, roleID int32, req request.SetSysRoleApisRequest) error {
	_, err := s.queries.GetSysRoleByID(ctx, roleID)
	if err != nil {
		return dberr.MapNoRows(err, errs.ErrSysRoleNotFound)
	}

	tx, err := s.pool.BeginTx(ctx, pgx.TxOptions{})
	if err != nil {
		return err
	}

	defer func(ctx context.Context) {
		_ = tx.Rollback(ctx)
	}(ctx)

	q := db.New(tx)

	permissionIds, err := s.queries.GetSysPermissionIdsByApiIDs(ctx, req.ApiIDs)
	if err != nil {
		return err
	}

	params := make([]db.CreateSysRolePermissionParams, 0, len(permissionIds))
	for _, id := range permissionIds {
		params = append(params, db.CreateSysRolePermissionParams{
			RoleID:       roleID,
			PermissionID: id,
		})
	}

	if err = q.DeleteSysRolePermission(ctx, db.DeleteSysRolePermissionParams{
		RoleID: roleID,
		Type:   int16(enum.PermissionTypeApi),
	}); err != nil {
		return err
	}

	_, err = q.CreateSysRolePermission(ctx, params)
	if err != nil {
		return err
	}

	if err = tx.Commit(ctx); err != nil {
		return err
	}

	// 清理缓存
	s.cache.ClearAllSysUserCache()

	return err
}

func (s *SysRoleService) Delete(ctx context.Context, id int32) error {
	// 清理缓存
	s.cache.ClearAllSysUserCache()
	rows, err := s.queries.DeleteSysRole(ctx, id)
	return dberr.MapRowsAffected(rows, err, errs.ErrSysRoleNotFound)
}