// Package database provides database abstraction for storing NixOS options.
package database

import (
	"context"
	"time"
)

// Revision represents an indexed nixpkgs revision.
type Revision struct {
	ID          int64
	GitHash     string
	ChannelName string
	CommitDate  time.Time
	IndexedAt   time.Time
	OptionCount int
}

// Option represents a NixOS configuration option.
type Option struct {
	ID           int64
	RevisionID   int64
	Name         string
	ParentPath   string
	Type         string
	DefaultValue string // JSON text
	Example      string // JSON text
	Description  string
	ReadOnly     bool
}

// Declaration represents a file where an option is declared.
type Declaration struct {
	ID       int64
	OptionID int64
	FilePath string
	Line     int
}

// File represents a cached file from nixpkgs.
type File struct {
	ID         int64
	RevisionID int64
	FilePath   string
	Extension  string
	Content    string
	ByteSize   int
	LineCount  int
}

// DeclarationWithMetadata includes declaration info plus file metadata.
type DeclarationWithMetadata struct {
	Declaration
	ByteSize  int  // File size in bytes, 0 if file not indexed
	LineCount int  // Number of lines, 0 if file not indexed
	HasFile   bool // True if file is indexed
}

// FileRange specifies a range of lines to return from a file.
type FileRange struct {
	Offset int // Line offset (0-based)
	Limit  int // Maximum lines to return (0 = default 250)
}

// FileResult contains a file with range metadata.
type FileResult struct {
	*File
	TotalLines int // Total lines in the file
	StartLine  int // First line returned (1-based)
	EndLine    int // Last line returned (1-based)
}

// SearchFilters contains optional filters for option search.
type SearchFilters struct {
	Type       string
	Namespace  string
	HasDefault *bool
	Limit      int
	Offset     int
}

// Store defines the interface for database operations.
type Store interface {
	// Schema operations
	Initialize(ctx context.Context) error
	Close() error

	// Revision operations
	CreateRevision(ctx context.Context, rev *Revision) error
	GetRevision(ctx context.Context, gitHash string) (*Revision, error)
	GetRevisionByChannel(ctx context.Context, channel string) (*Revision, error)
	ListRevisions(ctx context.Context) ([]*Revision, error)
	DeleteRevision(ctx context.Context, id int64) error
	UpdateRevisionOptionCount(ctx context.Context, id int64, count int) error

	// Option operations
	CreateOption(ctx context.Context, opt *Option) error
	CreateOptionsBatch(ctx context.Context, opts []*Option) error
	GetOption(ctx context.Context, revisionID int64, name string) (*Option, error)
	GetChildren(ctx context.Context, revisionID int64, parentPath string) ([]*Option, error)
	SearchOptions(ctx context.Context, revisionID int64, query string, filters SearchFilters) ([]*Option, error)

	// Declaration operations
	CreateDeclaration(ctx context.Context, decl *Declaration) error
	CreateDeclarationsBatch(ctx context.Context, decls []*Declaration) error
	GetDeclarations(ctx context.Context, optionID int64) ([]*Declaration, error)
	GetDeclarationsWithMetadata(ctx context.Context, revisionID, optionID int64) ([]*DeclarationWithMetadata, error)

	// File operations
	CreateFile(ctx context.Context, file *File) error
	CreateFilesBatch(ctx context.Context, files []*File) error
	GetFile(ctx context.Context, revisionID int64, path string) (*File, error)
	GetFileWithRange(ctx context.Context, revisionID int64, path string, r FileRange) (*FileResult, error)
}