package mysql

import (
	"context"
	"encoding/json"
	"git.aiterp.net/lucifer/new-server/models"
	"github.com/jmoiron/sqlx"
)

type eventHandlerRecord struct {
	ID             int             `db:"id"`
	EventName      string          `db:"event_name"`
	OneShot        bool            `db:"one_shot"`
	Priority       int             `db:"priority"`
	TargetKind     string          `db:"target_kind"`
	TargetValue    string          `db:"target_value"`
	From           *string         `db:"from_tod"`
	To             *string         `db:"to_tod"`
	ConditionsJSON json.RawMessage `db:"conditions"`
	ActionsJSON    json.RawMessage `db:"actions"`
}

type EventHandlerRepo struct {
	DBX *sqlx.DB
}

func (r *EventHandlerRepo) FindByID(ctx context.Context, id int) (*models.EventHandler, error) {
	var record eventHandlerRecord
	err := r.DBX.GetContext(ctx, &record, "SELECT * FROM event_handler WHERE id = ?", id)
	if err != nil {
		return nil, dbErr(err)
	}

	return r.populateOne(&record)
}

func (r *EventHandlerRepo) FetchAll(ctx context.Context) ([]models.EventHandler, error) {
	var records []eventHandlerRecord
	err := r.DBX.SelectContext(ctx, &records, "SELECT * FROM event_handler ORDER BY priority DESC, id")
	if err != nil {
		return nil, dbErr(err)
	}

	return r.populate(records)
}

func (r *EventHandlerRepo) Save(ctx context.Context, handler *models.EventHandler) error {
	conditionsJson, err := json.Marshal(handler.Conditions)
	if err != nil {
		return dbErr(err)
	}
	actionsJson, err := json.Marshal(handler.Actions)
	if err != nil {
		return dbErr(err)
	}

	record := eventHandlerRecord{
		ID:             handler.ID,
		EventName:      handler.EventName,
		OneShot:        handler.OneShot,
		Priority:       handler.Priority,
		TargetKind:     string(handler.TargetKind),
		TargetValue:    handler.TargetValue,
		ConditionsJSON: conditionsJson,
		ActionsJSON:    actionsJson,
		From:           handler.From.StringPtr(),
		To:             handler.To.StringPtr(),
	}

	if record.ID == 0 {
		res, err := r.DBX.NamedExecContext(ctx, `
			INSERT INTO event_handler (event_name, one_shot, priority, target_kind, target_value, conditions, from_tod, to_tod, actions)
			VALUES (:event_name, :one_shot, :priority, :target_kind, :target_value, :conditions, :from_tod, :to_tod, :actions);
		`, record)
		if err != nil {
			return dbErr(err)
		}

		id, err := res.LastInsertId()
		if err != nil {
			return dbErr(err)
		}

		handler.ID = int(id)
	} else {
		_, err := r.DBX.NamedExecContext(ctx, `
			UPDATE event_handler SET
				event_name = :event_name,
				one_shot = :one_shot,
				priority = :priority,
				target_kind = :target_kind,
				target_value = :target_value,
				conditions = :conditions,
				from_tod = :from_tod,
				to_tod = :to_tod,
				actions = :actions
			WHERE id = :id
		`, record)
		if err != nil {
			return dbErr(err)
		}
	}

	return nil
}

func (r *EventHandlerRepo) Delete(ctx context.Context, handler *models.EventHandler) error {
	_, err := r.DBX.ExecContext(ctx, "DELETE FROM event_handler WHERE id=?", handler.ID)
	if err != nil {
		return dbErr(err)
	}

	return nil
}

func (r *EventHandlerRepo) populateOne(record *eventHandlerRecord) (*models.EventHandler, error) {
	records, err := r.populate([]eventHandlerRecord{*record})
	if err != nil {
		return nil, err
	}

	return &records[0], nil
}

func (r *EventHandlerRepo) populate(records []eventHandlerRecord) ([]models.EventHandler, error) {
	res := make([]models.EventHandler, 0, len(records))

	for _, record := range records {
		handler := models.EventHandler{
			ID:          record.ID,
			EventName:   record.EventName,
			OneShot:     record.OneShot,
			Priority:    record.Priority,
			TargetKind:  models.ReferenceKind(record.TargetKind),
			TargetValue: record.TargetValue,
			Conditions:  make(map[string]models.EventCondition),
		}

		err := json.Unmarshal(record.ConditionsJSON, &handler.Conditions)
		if err != nil {
			return nil, dbErr(err)
		}
		err = json.Unmarshal(record.ActionsJSON, &handler.Actions)
		if err != nil {
			return nil, dbErr(err)
		}

		handler.From, err = models.ParseTimeOfDayPtr(record.From)
		if err != nil {
			return nil, dbErr(err)
		}
		handler.To, err = models.ParseTimeOfDayPtr(record.To)
		if err != nil {
			return nil, dbErr(err)
		}

		res = append(res, handler)
	}

	return res, nil
}