package repo

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"strings"
	"sync"
	"time"

	"browser.local/platform/domain"

	_ "github.com/go-sql-driver/mysql"
)

const mysqlSnapshotID = "current"

type MySQLStore struct {
	*MemoryStore
	db        *sql.DB
	persistMu sync.Mutex
}

func NewMySQLStore(dsn string) (*MySQLStore, error) {
	dsn = strings.TrimSpace(dsn)
	if dsn == "" {
		return nil, fmt.Errorf("PLATFORM_MYSQL_DSN is required when PLATFORM_STORAGE_BACKEND=mysql")
	}
	db, err := sql.Open("mysql", dsn)
	if err != nil {
		return nil, fmt.Errorf("open mysql metadata store: %w", err)
	}
	store := &MySQLStore{
		MemoryStore: NewMemoryStore(),
		db:          db,
	}
	if err := store.initialize(); err != nil {
		_ = db.Close()
		return nil, err
	}
	if err := store.load(); err != nil {
		_ = db.Close()
		return nil, err
	}
	return store, nil
}

func (store *MySQLStore) Close() error {
	return store.db.Close()
}

func (store *MySQLStore) Users() UserRepository {
	return &persistentRepository[domain.User, domain.UserFilter]{repository: store.MemoryStore.users, persist: store.persist}
}

func (store *MySQLStore) AuthSessions() AuthSessionRepository {
	return &persistentRepository[domain.AuthSessionRecord, domain.AuthSessionFilter]{repository: store.MemoryStore.authSessions, persist: store.persist}
}

func (store *MySQLStore) RunControlSessions() RunControlSessionRepository {
	return &persistentRepository[domain.RunControlSession, struct{}]{repository: store.MemoryStore.runSessions, persist: store.persist}
}

func (store *MySQLStore) AIProviders() AIProviderRepository {
	return &persistentRepository[domain.AIProvider, domain.AIProviderFilter]{repository: store.MemoryStore.aiProviders, persist: store.persist}
}

func (store *MySQLStore) GamePlugins() GamePluginRepository {
	return &persistentRepository[domain.GamePlugin, domain.GamePluginFilter]{repository: store.MemoryStore.gamePlugins, persist: store.persist}
}

func (store *MySQLStore) ServerInstances() ServerInstanceRepository {
	return &persistentRepository[domain.ServerInstance, domain.ServerInstanceFilter]{repository: store.MemoryStore.serverInstances, persist: store.persist}
}

func (store *MySQLStore) RunEndpoints() RunEndpointRepository {
	return &persistentRepository[domain.RunEndpoint, domain.RunEndpointFilter]{repository: store.MemoryStore.runEndpoints, persist: store.persist}
}

func (store *MySQLStore) Jobs() JobRepository {
	return &persistentJobRepository{
		persistentRepository: &persistentRepository[domain.Job, domain.JobFilter]{repository: store.MemoryStore.jobs, persist: store.persist},
		repository:           store.MemoryStore.jobs,
	}
}

func (store *MySQLStore) Artifacts() ArtifactRepository {
	return &persistentRepository[domain.Artifact, domain.ArtifactFilter]{repository: store.MemoryStore.artifacts, persist: store.persist}
}

func (store *MySQLStore) RuntimeBindings() RuntimeBindingRepository {
	return &persistentRepository[domain.RuntimeBinding, domain.RuntimeBindingFilter]{repository: store.MemoryStore.runtimeBindings, persist: store.persist}
}

func (store *MySQLStore) EncryptedComponentKeys() EncryptedComponentKeyRepository {
	return &persistentRepository[domain.EncryptedComponentKey, domain.EncryptedComponentKeyFilter]{repository: store.MemoryStore.componentKeys, persist: store.persist}
}

func (store *MySQLStore) RunDistributions() RunDistributionRepository {
	return &persistentRepository[domain.RunDistribution, domain.RunDistributionFilter]{repository: store.MemoryStore.runDists, persist: store.persist}
}

func (store *MySQLStore) ClientManagerDistributions() ClientManagerDistributionRepository {
	return &persistentRepository[domain.ClientManagerDistribution, domain.ClientManagerDistributionFilter]{repository: store.MemoryStore.clientDists, persist: store.persist}
}

func (store *MySQLStore) ClientManagerInstallations() ClientManagerInstallationRepository {
	return &persistentRepository[domain.ClientManagerInstallation, domain.ClientManagerInstallationFilter]{repository: store.MemoryStore.clientInstalls, persist: store.persist}
}

func (store *MySQLStore) ClientManagerSessions() ClientManagerSessionRepository {
	return &persistentRepository[domain.ClientManagerSession, domain.ClientManagerSessionFilter]{repository: store.MemoryStore.clientSessions, persist: store.persist}
}

func (store *MySQLStore) ClientManagerNonces() ClientManagerNonceRepository {
	return &persistentRepository[domain.ClientManagerRegistrationNonce, domain.ClientManagerNonceFilter]{repository: store.MemoryStore.clientNonces, persist: store.persist}
}

func (store *MySQLStore) DependencyStatuses() DependencyStatusRepository {
	return &persistentRepository[domain.DependencyStatus, domain.DependencyStatusFilter]{repository: store.MemoryStore.dependencies, persist: store.persist}
}

func (store *MySQLStore) ClientManagerBuildJobs() ClientManagerBuildJobRepository {
	return &persistentRepository[domain.ClientManagerBuildJob, domain.ClientManagerBuildJobFilter]{repository: store.MemoryStore.buildJobs, persist: store.persist}
}

func (store *MySQLStore) RunUpdateJobs() RunUpdateJobRepository {
	return &persistentRepository[domain.RunUpdateJob, domain.RunUpdateJobFilter]{repository: store.MemoryStore.updateJobs, persist: store.persist}
}

func (store *MySQLStore) LogStreams() LogStreamRepository {
	return &persistentRepository[domain.LogStream, domain.LogStreamFilter]{repository: store.MemoryStore.logStreams, persist: store.persist}
}

func (store *MySQLStore) AuditEvents() AuditEventRepository {
	return &persistentRepository[domain.AuditEvent, domain.AuditEventFilter]{repository: store.MemoryStore.auditEvents, persist: store.persist}
}

func (store *MySQLStore) MetricSamples() MetricSampleRepository {
	return &persistentRepository[domain.MetricSample, domain.MetricSampleFilter]{repository: store.MemoryStore.metricSamples, persist: store.persist}
}

func (store *MySQLStore) Backups() BackupRepository {
	return &persistentRepository[domain.BackupRecord, domain.BackupFilter]{repository: store.MemoryStore.backups, persist: store.persist}
}

func (store *MySQLStore) Alerts() AlertRepository {
	return &persistentRepository[domain.AlertRecord, domain.AlertFilter]{repository: store.MemoryStore.alerts, persist: store.persist}
}

func (store *MySQLStore) PluginLifecycles() PluginLifecycleRepository {
	return &persistentRepository[domain.PluginLifecycleInstallation, domain.PluginLifecycleFilter]{repository: store.MemoryStore.pluginLifecycle, persist: store.persist}
}

func (store *MySQLStore) AIConfigDiffs() AIConfigDiffRepository {
	return &persistentRepository[domain.AIConfigDiffPreview, domain.AIConfigDiffFilter]{repository: store.MemoryStore.aiConfigDiffs, persist: store.persist}
}

func (store *MySQLStore) GameClientBridgeCommands() GameClientBridgeCommandRepository {
	return &persistentGameClientBridgeCommandRepository{
		persistentRepository: &persistentRepository[domain.GameClientBridgeCommand, domain.GameClientBridgeCommandFilter]{repository: store.MemoryStore.bridgeCommands, persist: store.persist},
		repository:           store.MemoryStore.bridgeCommands,
	}
}

func (store *MySQLStore) GameClientBridgeSnapshots() GameClientBridgeSnapshotRepository {
	return &persistentRepository[domain.GameClientBridgeSnapshot, domain.GameClientBridgeSnapshotFilter]{repository: store.MemoryStore.bridgeSnapshots, persist: store.persist}
}

func (store *MySQLStore) GameClientBridgeSnapshotStreams() GameClientBridgeSnapshotStreamRepository {
	return &persistentRepository[domain.GameClientBridgeSnapshotStream, domain.GameClientBridgeSnapshotStreamFilter]{repository: store.MemoryStore.bridgeStreams, persist: store.persist}
}
func (store *MySQLStore) GamePlayers() GamePlayerRepository {
	return &persistentRepository[domain.GamePlayer, domain.GamePlayerFilter]{repository: store.MemoryStore.gamePlayers, persist: store.persist}
}
func (store *MySQLStore) GamePlayerAliases() GamePlayerAliasRepository {
	return &persistentRepository[domain.GamePlayerAlias, domain.GamePlayerAliasFilter]{repository: store.MemoryStore.gamePlayerAliases, persist: store.persist}
}
func (store *MySQLStore) GamePlayerSessions() GamePlayerSessionRepository {
	return &persistentRepository[domain.GamePlayerSession, domain.GamePlayerSessionFilter]{repository: store.MemoryStore.gamePlayerSessions, persist: store.persist}
}
func (store *MySQLStore) GameAccessAttempts() GameAccessAttemptRepository {
	return &persistentRepository[domain.GameAccessAttempt, domain.GameAccessAttemptFilter]{repository: store.MemoryStore.gameAccessAttempts, persist: store.persist}
}
func (store *MySQLStore) GameSecuritySignals() GameSecuritySignalRepository {
	return &persistentRepository[domain.GameSecuritySignal, domain.GameSecuritySignalFilter]{repository: store.MemoryStore.gameSecuritySignals, persist: store.persist}
}
func (store *MySQLStore) GamePlayerStatePatches() GamePlayerStatePatchRepository {
	return &persistentRepository[domain.GamePlayerStatePatch, domain.GamePlayerStatePatchFilter]{repository: store.MemoryStore.gamePlayerStatePatches, persist: store.persist}
}
func (store *MySQLStore) GameGiftCatalogs() GameGiftCatalogRepository {
	return &persistentRepository[domain.GameGiftCatalog, domain.GameGiftCatalogFilter]{repository: store.MemoryStore.gameGiftCatalogs, persist: store.persist}
}
func (store *MySQLStore) GameGiftRevisions() GameGiftRevisionRepository {
	return &persistentRepository[domain.GameGiftRevision, domain.GameGiftRevisionFilter]{repository: store.MemoryStore.gameGiftRevisions, persist: store.persist}
}
func (store *MySQLStore) GameGiftGrants() GameGiftGrantRepository {
	return &persistentRepository[domain.GameGiftGrant, domain.GameGiftGrantFilter]{repository: store.MemoryStore.gameGiftGrants, persist: store.persist}
}

func (store *MySQLStore) initialize() error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := store.db.PingContext(ctx); err != nil {
		return fmt.Errorf("connect mysql metadata store: %w", err)
	}
	_, err := store.db.ExecContext(ctx, `
CREATE TABLE IF NOT EXISTS platform_metadata_snapshots (
  id VARCHAR(64) PRIMARY KEY,
  snapshot_json JSON NOT NULL,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)`)
	if err != nil {
		return fmt.Errorf("create mysql metadata snapshot table: %w", err)
	}
	return nil
}

func (store *MySQLStore) load() error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	var payload []byte
	err := store.db.QueryRowContext(ctx, "SELECT snapshot_json FROM platform_metadata_snapshots WHERE id = ?", mysqlSnapshotID).Scan(&payload)
	if err != nil {
		if err == sql.ErrNoRows {
			return nil
		}
		return fmt.Errorf("read mysql metadata snapshot: %w", err)
	}
	var snapshot StoreSnapshot
	if err := json.Unmarshal(payload, &snapshot); err != nil {
		return fmt.Errorf("decode mysql metadata snapshot: %w", err)
	}
	store.loadSnapshot(snapshot)
	return nil
}

func (store *MySQLStore) persist() error {
	store.persistMu.Lock()
	defer store.persistMu.Unlock()

	snapshot := store.snapshot()
	payload, err := json.Marshal(snapshot)
	if err != nil {
		return fmt.Errorf("encode mysql metadata snapshot: %w", err)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	_, err = store.db.ExecContext(ctx, `
INSERT INTO platform_metadata_snapshots (id, snapshot_json)
VALUES (?, ?)
ON DUPLICATE KEY UPDATE snapshot_json = ?, updated_at = CURRENT_TIMESTAMP`, mysqlSnapshotID, string(payload), string(payload))
	if err != nil {
		return fmt.Errorf("write mysql metadata snapshot: %w", err)
	}
	return nil
}

func (store *MySQLStore) snapshot() StoreSnapshot {
	return StoreSnapshot{
		Users:                      snapshotRepository(store.MemoryStore.users),
		AuthSessions:               snapshotRepository(store.MemoryStore.authSessions),
		RunControlSessions:         snapshotRepository(store.MemoryStore.runSessions),
		AIProviders:                snapshotRepository(store.MemoryStore.aiProviders),
		GamePlugins:                snapshotRepository(store.MemoryStore.gamePlugins),
		ServerInstances:            snapshotRepository(store.MemoryStore.serverInstances),
		RunEndpoints:               snapshotRepository(store.MemoryStore.runEndpoints),
		Jobs:                       snapshotRepository(store.MemoryStore.jobs.memoryRepository),
		Artifacts:                  snapshotRepository(store.MemoryStore.artifacts),
		RuntimeBindings:            snapshotRepository(store.MemoryStore.runtimeBindings),
		EncryptedComponentKeys:     snapshotRepository(store.MemoryStore.componentKeys),
		RunDistributions:           snapshotRepository(store.MemoryStore.runDists),
		ClientManagerDistributions: snapshotRepository(store.MemoryStore.clientDists),
		ClientManagerInstallations: snapshotRepository(store.MemoryStore.clientInstalls),
		ClientManagerSessions:      snapshotRepository(store.MemoryStore.clientSessions),
		ClientManagerNonces:        snapshotRepository(store.MemoryStore.clientNonces),
		DependencyStatuses:         snapshotRepository(store.MemoryStore.dependencies),
		ClientManagerBuildJobs:     snapshotRepository(store.MemoryStore.buildJobs),
		RunUpdateJobs:              snapshotRepository(store.MemoryStore.updateJobs),
		LogStreams:                 snapshotRepository(store.MemoryStore.logStreams),
		AuditEvents:                snapshotRepository(store.MemoryStore.auditEvents),
		MetricSamples:              snapshotRepository(store.MemoryStore.metricSamples),
		Backups:                    snapshotRepository(store.MemoryStore.backups),
		Alerts:                     snapshotRepository(store.MemoryStore.alerts),
		PluginLifecycles:           snapshotRepository(store.MemoryStore.pluginLifecycle),
		AIConfigDiffs:              snapshotRepository(store.MemoryStore.aiConfigDiffs),
		GameClientBridgeCommands:   snapshotRepository(store.MemoryStore.bridgeCommands.memoryRepository),
		GameClientBridgeSnapshots:  snapshotRepository(store.MemoryStore.bridgeSnapshots.memoryRepository),
		GameClientBridgeStreams:    snapshotRepository(store.MemoryStore.bridgeStreams),
		GamePlayers:                snapshotRepository(store.MemoryStore.gamePlayers), GamePlayerAliases: snapshotRepository(store.MemoryStore.gamePlayerAliases), GamePlayerSessions: snapshotRepository(store.MemoryStore.gamePlayerSessions), GameAccessAttempts: snapshotRepository(store.MemoryStore.gameAccessAttempts), GameSecuritySignals: snapshotRepository(store.MemoryStore.gameSecuritySignals), GamePlayerStatePatches: snapshotRepository(store.MemoryStore.gamePlayerStatePatches), GameGiftCatalogs: snapshotRepository(store.MemoryStore.gameGiftCatalogs), GameGiftRevisions: snapshotRepository(store.MemoryStore.gameGiftRevisions), GameGiftGrants: snapshotRepository(store.MemoryStore.gameGiftGrants),
	}
}

func (store *MySQLStore) loadSnapshot(snapshot StoreSnapshot) {
	loadRepository(store.MemoryStore.users, snapshot.Users)
	loadRepository(store.MemoryStore.authSessions, snapshot.AuthSessions)
	loadRepository(store.MemoryStore.runSessions, snapshot.RunControlSessions)
	loadRepository(store.MemoryStore.aiProviders, snapshot.AIProviders)
	loadRepository(store.MemoryStore.gamePlugins, snapshot.GamePlugins)
	loadRepository(store.MemoryStore.serverInstances, snapshot.ServerInstances)
	loadRepository(store.MemoryStore.runEndpoints, snapshot.RunEndpoints)
	loadRepository(store.MemoryStore.jobs.memoryRepository, snapshot.Jobs)
	loadRepository(store.MemoryStore.artifacts, snapshot.Artifacts)
	loadRepository(store.MemoryStore.runtimeBindings, snapshot.RuntimeBindings)
	loadRepository(store.MemoryStore.componentKeys, snapshot.EncryptedComponentKeys)
	loadRepository(store.MemoryStore.runDists, snapshot.RunDistributions)
	loadRepository(store.MemoryStore.clientDists, snapshot.ClientManagerDistributions)
	loadRepository(store.MemoryStore.clientInstalls, snapshot.ClientManagerInstallations)
	loadRepository(store.MemoryStore.clientSessions, snapshot.ClientManagerSessions)
	loadRepository(store.MemoryStore.clientNonces, snapshot.ClientManagerNonces)
	loadRepository(store.MemoryStore.dependencies, snapshot.DependencyStatuses)
	loadRepository(store.MemoryStore.buildJobs, snapshot.ClientManagerBuildJobs)
	loadRepository(store.MemoryStore.updateJobs, snapshot.RunUpdateJobs)
	loadRepository(store.MemoryStore.logStreams, snapshot.LogStreams)
	loadRepository(store.MemoryStore.auditEvents, snapshot.AuditEvents)
	loadRepository(store.MemoryStore.metricSamples, snapshot.MetricSamples)
	loadRepository(store.MemoryStore.backups, snapshot.Backups)
	loadRepository(store.MemoryStore.alerts, snapshot.Alerts)
	loadRepository(store.MemoryStore.pluginLifecycle, snapshot.PluginLifecycles)
	loadRepository(store.MemoryStore.aiConfigDiffs, snapshot.AIConfigDiffs)
	loadRepository(store.MemoryStore.bridgeCommands.memoryRepository, snapshot.GameClientBridgeCommands)
	loadRepository(store.MemoryStore.bridgeSnapshots.memoryRepository, snapshot.GameClientBridgeSnapshots)
	loadRepository(store.MemoryStore.bridgeStreams, snapshot.GameClientBridgeStreams)
	loadRepository(store.MemoryStore.gamePlayers, snapshot.GamePlayers)
	loadRepository(store.MemoryStore.gamePlayerAliases, snapshot.GamePlayerAliases)
	loadRepository(store.MemoryStore.gamePlayerSessions, snapshot.GamePlayerSessions)
	loadRepository(store.MemoryStore.gameAccessAttempts, snapshot.GameAccessAttempts)
	loadRepository(store.MemoryStore.gameSecuritySignals, snapshot.GameSecuritySignals)
	loadRepository(store.MemoryStore.gamePlayerStatePatches, snapshot.GamePlayerStatePatches)
	loadRepository(store.MemoryStore.gameGiftCatalogs, snapshot.GameGiftCatalogs)
	loadRepository(store.MemoryStore.gameGiftRevisions, snapshot.GameGiftRevisions)
	loadRepository(store.MemoryStore.gameGiftGrants, snapshot.GameGiftGrants)
}