package store

import (
	"database/sql"
	"fmt"
	"gitea.deepak.science/deepak/gogmagog/models"
)

type inMemoryStore struct {
	actions      []*models.Action
	plans        []*models.Plan
	users        []*models.User
	primaryPlans []*models.PrimaryPlan
}

// GetInMemoryStore provides a purely in memory store, for testing purposes only, with no persistence.
func GetInMemoryStore() (models.Store, error) {
	return &inMemoryStore{
		actions: make([]*models.Action, 0),
		plans:   make([]*models.Plan, 0),
		users:   make([]*models.User, 0),
	}, nil
}

func (store *inMemoryStore) SelectActions(userID int) ([]*models.Action, error) {
	ret := make([]*models.Action, 0)
	for _, action := range store.actions {
		if int(action.UserID) == userID {
			ret = append(ret, action)
		}
	}
	return ret, nil
}

func (store *inMemoryStore) SelectActionsByPlanID(plan *models.Plan, userID int) ([]*models.Action, error) {
	ret := make([]*models.Action, 0)
	for _, action := range store.actions {
		if (int(plan.PlanID) == int(action.PlanID)) && (int(action.UserID) == userID) {
			ret = append(ret, action)
		}
	}
	return ret, nil
}

func (store *inMemoryStore) SelectActionByID(id int, userID int) (*models.Action, error) {
	for _, action := range store.actions {
		if id == int(action.ActionID) && (int(action.UserID) == userID) {
			return action, nil
		}
	}
	return nil, sql.ErrNoRows
}

func (store *inMemoryStore) InsertAction(action *models.Action, userID int) (int, error) {
	id := len(store.actions) + 1
	action.ActionID = int64(id)
	action.UserID = int64(userID)
	store.actions = append(store.actions, action)
	return id, nil
}

func (store *inMemoryStore) UpdateAction(action *models.Action, userID int) error {
	currentAction, err := store.SelectActionByID(int(action.ActionID), userID)
	if err != nil {
		return err
	}
	currentAction.ActionDescription = action.ActionDescription
	currentAction.EstimatedChunks = action.EstimatedChunks
	currentAction.CompletedChunks = action.CompletedChunks
	currentAction.PlanID = action.PlanID

	return nil

}

func (store *inMemoryStore) SelectPlans(userID int) ([]*models.Plan, error) {
	ret := make([]*models.Plan, 0)
	for _, plan := range store.plans {
		if int(plan.UserID) == userID {
			ret = append(ret, plan)
		}
	}
	return ret, nil
}

func (store *inMemoryStore) SelectPlanByID(id int, userID int) (*models.Plan, error) {
	for _, plan := range store.plans {
		if id == int(plan.PlanID) && (userID == int(plan.UserID)) {
			return plan, nil
		}
	}
	return nil, sql.ErrNoRows
}

func (store *inMemoryStore) InsertPlan(plan *models.Plan, userID int) (int, error) {
	id := len(store.plans) + 1
	plan.PlanID = int64(id)
	plan.UserID = int64(userID)
	store.plans = append(store.plans, plan)
	return id, nil
}

func (store *inMemoryStore) SelectPrimaryPlan(userID int) (*models.PrimaryPlan, error) {
	for _, primaryPlan := range store.primaryPlans {
		if userID == int(primaryPlan.UserID) {
			return primaryPlan, nil
		}
	}
	return nil, sql.ErrNoRows
}

func (store *inMemoryStore) InsertPrimaryPlan(primaryPlan *models.PrimaryPlan, userID int) error {
	_, err := store.SelectPrimaryPlan(userID)
	if err != sql.ErrNoRows {
		return err
	}
	if err == nil {
		return fmt.Errorf("Can't insert primary plan")
	}

	store.primaryPlans = append(store.primaryPlans, &models.PrimaryPlan{PlanID: int64(primaryPlan.PlanID), UserID: int64(userID)})
	return nil
}

func (store *inMemoryStore) UpdatePrimaryPlan(primaryPlan *models.PrimaryPlan, userID int) error {
	current, err := store.SelectPrimaryPlan(userID)
	if err != nil {
		return err
	}
	current.PlanID = primaryPlan.PlanID
	return nil
}

func (store *inMemoryStore) ConnectionLive() error {
	return nil
}

func (store *inMemoryStore) SelectUserByUsername(username string) (*models.User, error) {
	for _, user := range store.users {
		if username == user.Username {
			return user, nil
		}
	}
	return nil, sql.ErrNoRows
}

// inMemoryStore.InsertUser will not enforce unique usernames, which is ok.
func (store *inMemoryStore) InsertUser(user *models.User) (int, error) {
	id := len(store.users) + 1
	user.UserID = int64(id)
	store.users = append(store.users, user)
	return id, nil
}