package biz

import (
	"context"
	"time"

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

// Defining the `App` business logic.
type App struct {
	Trans  *util.Trans
	AppDAL *dal.App
}

// Query apps from the data access object based on the provided parameters and options.
func (a *App) Query(ctx context.Context, params schema.AppQueryParam) (*schema.AppQueryResult, error) {
	params.Pagination = true

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

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

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

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

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

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

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

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

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

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