package biz

import (
	"context"
	"time"

	"gitlab.guxuan.icu/jinshan_community/internal/mods/common/dal"
	"gitlab.guxuan.icu/jinshan_community/internal/mods/common/schema"
	"gitlab.guxuan.icu/jinshan_community/pkg/errors"
	"gitlab.guxuan.icu/jinshan_community/pkg/util"
)

// Defining the `Help` business logic.
type Help struct {
	Trans   *util.Trans
	HelpDAL *dal.Help
}

// Query helps from the data access object based on the provided parameters and options.
func (a *Help) Query(ctx context.Context, params schema.HelpQueryParam) (*schema.HelpQueryResult, error) {
	params.Pagination = true

	result, err := a.HelpDAL.Query(ctx, params, schema.HelpQueryOptions{
		QueryOptions: util.QueryOptions{
			OrderFields: []util.OrderByParam{
				{Field: "created_at", Direction: util.DESC},
			},
		},
	})
	if err != nil {
		return nil, err
	}
	return result, nil
}

// Get the specified help from the data access object.
func (a *Help) Get(ctx context.Context, id string) (*schema.Help, error) {
	help, err := a.HelpDAL.Get(ctx, id)
	if err != nil {
		return nil, err
	} else if help == nil {
		return nil, errors.NotFound("", "Help not found")
	}
	return help, nil
}

// Create a new help in the data access object.
func (a *Help) Create(ctx context.Context, formItem *schema.HelpForm) (*schema.Help, error) {
	help := &schema.Help{}

	if err := formItem.FillTo(help); err != nil {
		return nil, err
	}

	err := a.Trans.Exec(ctx, func(ctx context.Context) error {
		if err := a.HelpDAL.Create(ctx, help); err != nil {
			return err
		}
		return nil
	})
	if err != nil {
		return nil, err
	}
	return help, nil
}

// Update the specified help in the data access object.
func (a *Help) Update(ctx context.Context, id string, formItem *schema.HelpForm) error {
	help, err := a.HelpDAL.Get(ctx, id)
	if err != nil {
		return err
	} else if help == nil {
		return errors.NotFound("", "Help not found")
	}

	if err := formItem.FillTo(help); err != nil {
		return err
	}
	help.UpdatedAt = time.Now()

	return a.Trans.Exec(ctx, func(ctx context.Context) error {
		if err := a.HelpDAL.Update(ctx, help); err != nil {
			return err
		}
		return nil
	})
}

// Delete the specified help from the data access object.
func (a *Help) Delete(ctx context.Context, id string) error {
	exists, err := a.HelpDAL.Exists(ctx, id)
	if err != nil {
		return err
	} else if !exists {
		return errors.NotFound("", "Help not found")
	}

	return a.Trans.Exec(ctx, func(ctx context.Context) error {
		if err := a.HelpDAL.Delete(ctx, id); err != nil {
			return err
		}
		return nil
	})
}