package cache

import (
	"sync"

	"github.com/cloudbase/garm/params"
)

var entityCache *EntityCache

func init() {
	ghEntityCache := &EntityCache{
		entities: make(map[string]EntityItem),
	}
	entityCache = ghEntityCache
}

type EntityItem struct {
	Entity    params.GithubEntity
	Pools     map[string]params.Pool
	ScaleSets map[uint]params.ScaleSet
}

type EntityCache struct {
	mux sync.Mutex
	// entity IDs are UUID4s. It is highly unlikely they will collide (🤞).
	entities map[string]EntityItem
}

func (e *EntityCache) GetEntity(entity params.GithubEntity) (EntityItem, bool) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entity.ID]; ok {
		// Updating specific credential details will not update entity cache which
		// uses those credentials.
		// Entity credentials in the cache are only updated if you swap the creds
		// on the entity. We get the updated credentials from the credentials cache.
		creds, ok := GetGithubCredentials(cache.Entity.Credentials.ID)
		if ok {
			cache.Entity.Credentials = creds
		}
		return cache, true
	}
	return EntityItem{}, false
}

func (e *EntityCache) SetEntity(entity params.GithubEntity) {
	e.mux.Lock()
	defer e.mux.Unlock()

	e.entities[entity.ID] = EntityItem{
		Entity: entity,
	}
}

func (e *EntityCache) ReplaceEntityPools(entityID string, pools map[string]params.Pool) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		cache.Pools = pools
		e.entities[entityID] = cache
	}
}

func (e *EntityCache) ReplaceEntityScaleSets(entityID string, scaleSets map[uint]params.ScaleSet) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		cache.ScaleSets = scaleSets
		e.entities[entityID] = cache
	}
}

func (e *EntityCache) DeleteEntity(entityID string) {
	e.mux.Lock()
	defer e.mux.Unlock()
	delete(e.entities, entityID)
}

func (e *EntityCache) SetEntityPool(entityID string, pool params.Pool) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		cache.Pools[pool.ID] = pool
		e.entities[entityID] = cache
	}
}

func (e *EntityCache) SetEntityScaleSet(entityID string, scaleSet params.ScaleSet) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		cache.ScaleSets[scaleSet.ID] = scaleSet
		e.entities[entityID] = cache
	}
}

func (e *EntityCache) DeleteEntityPool(entityID string, poolID string) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		delete(cache.Pools, poolID)
		e.entities[entityID] = cache
	}
}

func (e *EntityCache) DeleteEntityScaleSet(entityID string, scaleSetID uint) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		delete(cache.ScaleSets, scaleSetID)
		e.entities[entityID] = cache
	}
}

func (e *EntityCache) GetEntityPool(entityID string, poolID string) (params.Pool, bool) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		if pool, ok := cache.Pools[poolID]; ok {
			return pool, true
		}
	}
	return params.Pool{}, false
}

func (e *EntityCache) GetEntityScaleSet(entityID string, scaleSetID uint) (params.ScaleSet, bool) {
	e.mux.Lock()
	defer e.mux.Unlock()

	if cache, ok := e.entities[entityID]; ok {
		if scaleSet, ok := cache.ScaleSets[scaleSetID]; ok {
			return scaleSet, true
		}
	}
	return params.ScaleSet{}, false
}

func GetEntity(entity params.GithubEntity) (EntityItem, bool) {
	return entityCache.GetEntity(entity)
}

func SetEntity(entity params.GithubEntity) {
	entityCache.SetEntity(entity)
}

func ReplaceEntityPools(entityID string, pools map[string]params.Pool) {
	entityCache.ReplaceEntityPools(entityID, pools)
}

func ReplaceEntityScaleSets(entityID string, scaleSets map[uint]params.ScaleSet) {
	entityCache.ReplaceEntityScaleSets(entityID, scaleSets)
}

func DeleteEntity(entityID string) {
	entityCache.DeleteEntity(entityID)
}

func SetEntityPool(entityID string, pool params.Pool) {
	entityCache.SetEntityPool(entityID, pool)
}

func SetEntityScaleSet(entityID string, scaleSet params.ScaleSet) {
	entityCache.SetEntityScaleSet(entityID, scaleSet)
}

func DeleteEntityPool(entityID string, poolID string) {
	entityCache.DeleteEntityPool(entityID, poolID)
}

func DeleteEntityScaleSet(entityID string, scaleSetID uint) {
	entityCache.DeleteEntityScaleSet(entityID, scaleSetID)
}

func GetEntityPool(entityID string, poolID string) (params.Pool, bool) {
	return entityCache.GetEntityPool(entityID, poolID)
}

func GetEntityScaleSet(entityID string, scaleSetID uint) (params.ScaleSet, bool) {
	return entityCache.GetEntityScaleSet(entityID, scaleSetID)
}