package store

import (
	"context"
	"time"

	"git.gobha.me/xcaliber/chat-switchboard/models"
)

// =========================================
// STORES — Data Access Layer
// =========================================
// Every database operation goes through these interfaces.
// Handlers never touch SQL directly. This makes the DB
// portable (Postgres today, SQLite/MySQL later) and
// handlers testable with in-memory implementations.
// =========================================

// Stores bundles all store interfaces for dependency injection.
type Stores struct {
	Providers     ProviderStore
	Catalog       CatalogStore
	Personas      PersonaStore
	Policies      PolicyStore
	UserSettings  UserModelSettingsStore
	Users         UserStore
	Teams         TeamStore
	Channels      ChannelStore
	Messages      MessageStore
	Audit         AuditStore
	Notes         NoteStore
	GlobalConfig  GlobalConfigStore
	Usage         UsageStore
	Pricing       PricingStore
}

// =========================================
// PROVIDER STORE
// =========================================

type ProviderStore interface {
	Create(ctx context.Context, cfg *models.ProviderConfig) error
	GetByID(ctx context.Context, id string) (*models.ProviderConfig, error)
	Update(ctx context.Context, id string, patch models.ProviderConfigPatch) error
	Delete(ctx context.Context, id string) error

	// Scoped queries
	ListGlobal(ctx context.Context) ([]models.ProviderConfig, error)
	ListForTeam(ctx context.Context, teamID string) ([]models.ProviderConfig, error)
	ListForUser(ctx context.Context, userID string) ([]models.ProviderConfig, error) // personal scope
	ListAccessible(ctx context.Context, userID string) ([]models.ProviderConfig, error) // all user can access

	// Access check
	UserCanAccess(ctx context.Context, userID, configID string) (bool, error)
}

// =========================================
// CATALOG STORE
// =========================================

type CatalogStore interface {
	// Sync from provider API
	UpsertFromSync(ctx context.Context, providerConfigID string, entries []CatalogSyncEntry) (added, updated int, err error)

	// Queries
	GetByID(ctx context.Context, id string) (*models.CatalogEntry, error)
	GetByModelID(ctx context.Context, providerConfigID, modelID string) (*models.CatalogEntry, error)
	GetByModelIDAny(ctx context.Context, modelID string) (*models.CatalogEntry, error) // any provider, most recently synced
	ListVisible(ctx context.Context) ([]models.CatalogEntry, error)
	ListEnabledForProvider(ctx context.Context, providerConfigID string) ([]models.CatalogEntry, error)
	ListForProvider(ctx context.Context, providerConfigID string) ([]models.CatalogEntry, error)
	ListAll(ctx context.Context) ([]models.CatalogEntry, error)       // everything (internal use)
	ListAllGlobal(ctx context.Context) ([]models.CatalogEntry, error) // admin view — global-scope providers only

	// Visibility management
	SetVisibility(ctx context.Context, id string, visibility string) error
	BulkSetVisibility(ctx context.Context, providerConfigID string, visibility string) error
	BulkSetVisibilityAll(ctx context.Context, visibility string) error

	// Delete
	Delete(ctx context.Context, id string) error
	DeleteForProvider(ctx context.Context, providerConfigID string) error
}

// CatalogSyncEntry is the input format from provider FetchModels.
type CatalogSyncEntry struct {
	ModelID      string
	DisplayName  string
	Capabilities models.ModelCapabilities
	Pricing      *models.ModelPricing
}

// =========================================
// PERSONA STORE
// =========================================

type PersonaStore interface {
	Create(ctx context.Context, p *models.Persona) error
	GetByID(ctx context.Context, id string) (*models.Persona, error)
	Update(ctx context.Context, id string, patch models.PersonaPatch) error
	Delete(ctx context.Context, id string) error

	// Scoped queries
	ListForUser(ctx context.Context, userID string) ([]models.Persona, error) // all visible to user
	ListForTeam(ctx context.Context, teamID string) ([]models.Persona, error)
	ListGlobal(ctx context.Context) ([]models.Persona, error)
	ListPersonal(ctx context.Context, userID string) ([]models.Persona, error) // user's own

	// Grants
	SetGrants(ctx context.Context, personaID string, grants []models.Grant) error
	GetGrants(ctx context.Context, personaID string) ([]models.Grant, error)
	GetToolGrants(ctx context.Context, personaID string) ([]string, error)

	// Access check
	UserCanAccess(ctx context.Context, userID, personaID string) (bool, error)
}

// =========================================
// POLICY STORE
// =========================================

type PolicyStore interface {
	Get(ctx context.Context, key string) (string, error)
	GetBool(ctx context.Context, key string) (bool, error)
	Set(ctx context.Context, key, value string, updatedBy string) error
	GetAll(ctx context.Context) (map[string]string, error)
}

// =========================================
// USER MODEL SETTINGS STORE
// =========================================

type UserModelSettingsStore interface {
	GetForUser(ctx context.Context, userID string) ([]models.UserModelSetting, error)
	GetHiddenModelIDs(ctx context.Context, userID string) (map[string]bool, error)
	Set(ctx context.Context, userID, modelID string, patch models.UserModelSettingPatch) error
	BulkSetHidden(ctx context.Context, userID string, modelIDs []string, hidden bool) error
}

// =========================================
// USER STORE
// =========================================

type UserStore interface {
	Create(ctx context.Context, u *models.User) error
	GetByID(ctx context.Context, id string) (*models.User, error)
	GetByUsername(ctx context.Context, username string) (*models.User, error)
	GetByEmail(ctx context.Context, email string) (*models.User, error)
	GetByLogin(ctx context.Context, login string) (*models.User, error) // username or email
	Update(ctx context.Context, id string, fields map[string]interface{}) error
	Delete(ctx context.Context, id string) error
	List(ctx context.Context, opts ListOptions) ([]models.User, int, error)
	UpdateLastLogin(ctx context.Context, id string) error
	SetActive(ctx context.Context, id string, active bool) error

	// Refresh tokens
	CreateRefreshToken(ctx context.Context, userID, tokenHash string, expiresAt time.Time) error
	GetRefreshToken(ctx context.Context, tokenHash string) (userID string, err error)
	RevokeRefreshToken(ctx context.Context, tokenHash string) error
	RevokeAllRefreshTokens(ctx context.Context, userID string) error
	CleanExpiredTokens(ctx context.Context) error
}

// =========================================
// TEAM STORE
// =========================================

type TeamStore interface {
	Create(ctx context.Context, t *models.Team) error
	GetByID(ctx context.Context, id string) (*models.Team, error)
	Update(ctx context.Context, id string, fields map[string]interface{}) error
	Delete(ctx context.Context, id string) error
	List(ctx context.Context) ([]models.Team, error)

	// Members
	AddMember(ctx context.Context, teamID, userID, role string) error
	RemoveMember(ctx context.Context, teamID, userID string) error
	UpdateMemberRole(ctx context.Context, teamID, userID, role string) error
	ListMembers(ctx context.Context, teamID string) ([]models.TeamMember, error)
	GetMember(ctx context.Context, teamID, userID string) (*models.TeamMember, error)
	GetUserTeamIDs(ctx context.Context, userID string) ([]string, error)
	IsTeamAdmin(ctx context.Context, teamID, userID string) (bool, error)
	IsMember(ctx context.Context, teamID, userID string) (bool, error)
}

// =========================================
// CHANNEL STORE
// =========================================

type ChannelStore interface {
	Create(ctx context.Context, ch *models.Channel) error
	GetByID(ctx context.Context, id string) (*models.Channel, error)
	Update(ctx context.Context, id string, fields map[string]interface{}) error
	Delete(ctx context.Context, id string) error
	ListForUser(ctx context.Context, userID string, opts ListOptions) ([]models.Channel, int, error)
	Search(ctx context.Context, userID, query string, opts ListOptions) ([]models.Channel, int, error)

	// Cursor management (conversation forking)
	GetCursor(ctx context.Context, channelID, userID string) (*models.ChannelCursor, error)
	SetCursor(ctx context.Context, channelID, userID, leafID string) error

	// Channel models
	SetModel(ctx context.Context, cm *models.ChannelModel) error
	GetModels(ctx context.Context, channelID string) ([]models.ChannelModel, error)

	// Ownership check
	UserOwns(ctx context.Context, channelID, userID string) (bool, error)
}

// =========================================
// MESSAGE STORE
// =========================================

type MessageStore interface {
	Create(ctx context.Context, m *models.Message) error
	GetByID(ctx context.Context, id string) (*models.Message, error)
	Update(ctx context.Context, id string, fields map[string]interface{}) error
	Delete(ctx context.Context, id string) error // soft delete
	ListForChannel(ctx context.Context, channelID string, opts ListOptions) ([]models.Message, error)

	// Tree operations
	GetChildren(ctx context.Context, parentID string) ([]models.Message, error)
	GetSiblings(ctx context.Context, messageID string) ([]models.Message, error)
	GetPathToRoot(ctx context.Context, messageID string) ([]models.Message, error)
	GetNextSiblingIndex(ctx context.Context, parentID string) (int, error)

	// Count
	CountForChannel(ctx context.Context, channelID string) (int, error)
}

// =========================================
// AUDIT STORE
// =========================================

type AuditStore interface {
	Log(ctx context.Context, entry *models.AuditEntry) error
	List(ctx context.Context, opts AuditListOptions) ([]models.AuditEntry, int, error)
}

type AuditListOptions struct {
	ListOptions
	ActorID      string
	Action       string
	ResourceType string
	ResourceID   string
	Since        *time.Time
	Until        *time.Time
}

// =========================================
// NOTE STORE
// =========================================

type NoteStore interface {
	Create(ctx context.Context, n *models.Note) error
	GetByID(ctx context.Context, id string) (*models.Note, error)
	Update(ctx context.Context, id string, fields map[string]interface{}) error
	Delete(ctx context.Context, id string) error
	ListForUser(ctx context.Context, userID string, opts NoteListOptions) ([]models.Note, int, error)
	Search(ctx context.Context, userID, query string, opts ListOptions) ([]models.Note, int, error)
	BulkDelete(ctx context.Context, ids []string, userID string) (int, error)
}

type NoteListOptions struct {
	ListOptions
	FolderPath string
	Tag        string
	TeamID     string
}

// =========================================
// GLOBAL CONFIG STORE
// =========================================

type GlobalConfigStore interface {
	Get(ctx context.Context, key string) (models.JSONMap, error)
	Set(ctx context.Context, key string, value models.JSONMap, updatedBy string) error
	GetAll(ctx context.Context) (map[string]models.JSONMap, error)
}

// =========================================
// USAGE STORE
// =========================================

type UsageStore interface {
	Log(ctx context.Context, entry *models.UsageEntry) error
	QueryByUser(ctx context.Context, userID string, opts UsageQueryOptions) ([]models.UsageAggregate, error)
	QueryByUserPersonal(ctx context.Context, userID string, opts UsageQueryOptions) ([]models.UsageAggregate, error)
	QueryByTeam(ctx context.Context, teamID string, opts UsageQueryOptions) ([]models.UsageAggregate, error)
	QueryByTeamProviders(ctx context.Context, teamID string, opts UsageQueryOptions) ([]models.UsageAggregate, error)
	QueryByModel(ctx context.Context, opts UsageQueryOptions) ([]models.UsageAggregate, error)
	GetTotals(ctx context.Context, opts UsageQueryOptions) (*models.UsageTotals, error)
	GetTeamProviderTotals(ctx context.Context, teamID string, opts UsageQueryOptions) (*models.UsageTotals, error)
	GetPersonalTotals(ctx context.Context, userID string, opts UsageQueryOptions) (*models.UsageTotals, error)
}

type UsageQueryOptions struct {
	Since       *time.Time
	Until       *time.Time
	GroupBy     string // "day", "model", "user", "provider"
	ExcludeBYOK bool   // true for admin views — filters provider_scope != 'personal'
	Limit       int
}

// =========================================
// PRICING STORE
// =========================================

type PricingStore interface {
	GetForModel(ctx context.Context, providerConfigID, modelID string) (*models.PricingEntry, error)
	Upsert(ctx context.Context, entry *models.PricingEntry) error
	UpsertFromCatalog(ctx context.Context, providerConfigID, modelID string, pricing *models.ModelPricing) error
	List(ctx context.Context) ([]models.PricingEntry, error)
	Delete(ctx context.Context, providerConfigID, modelID string) error
}

// =========================================
// SHARED TYPES
// =========================================

// ListOptions provides standard pagination/sort for list queries.
type ListOptions struct {
	Limit  int
	Offset int
	Sort   string // column name
	Order  string // "asc" or "desc"
}

// DefaultListOptions returns sensible defaults.
func DefaultListOptions() ListOptions {
	return ListOptions{
		Limit: 50,
		Order: "desc",
	}
}