package cmd

import (
	"context"
	"flag"
	"fmt"
	"os"
	"strconv"

	"skraak/tools"
)

// RunClusterCreate creates a new cluster for grouping recordings.
//
// JSON output schema:
//
//	{
//	  "cluster": {
//	    "id": string,                          // Cluster ID (12 characters)
//	    "dataset_id": string,                  // Parent dataset ID
//	    "location_id": string,                 // Parent location ID
//	    "name": string,                        // Cluster name
//	    "description": string,                 // Optional description (nullable)
//	    "created_at": string,                  // Creation timestamp (RFC3339)
//	    "last_modified": string,               // Last modification timestamp (RFC3339)
//	    "active": bool,                        // Whether the cluster is active
//	    "cyclic_recording_pattern_id": string, // Optional pattern ID (nullable)
//	    "sample_rate": int                     // Sample rate in Hz
//	  },
//	  "message": string                         // Success message
//	}
func RunClusterCreate(args []string) error {
	fs := flag.NewFlagSet("cluster create", flag.ExitOnError)
	dbPath := fs.String("db", "", "Path to DuckDB database (required)")
	datasetID := fs.String("dataset", "", "Dataset ID (required)")
	locationID := fs.String("location", "", "Location ID (required)")
	name := fs.String("name", "", "Cluster name (required)")
	sampleRate := fs.String("sample-rate", "", "Sample rate in Hz (required)")
	description := fs.String("description", "", "Cluster description (optional)")

	fs.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: skraak cluster create [options]\n\n")
		fmt.Fprintf(os.Stderr, "Create a new cluster for grouping recordings.\n\n")
		fmt.Fprintf(os.Stderr, "Options:\n")
		fs.PrintDefaults()
		fmt.Fprintf(os.Stderr, "\nExamples:\n")
		fmt.Fprintf(os.Stderr, "  skraak cluster create --db ./db/skraak.duckdb --dataset abc123 --location loc456 --name \"2024-01\" --sample-rate 250000\n")
	}

	if err := fs.Parse(args); err != nil {
		return fmt.Errorf("parsing flags: %w", err)
	}

	if err := checkFlags(fs, "--db", *dbPath, "--dataset", *datasetID, "--location", *locationID, "--name", *name, "--sample-rate", *sampleRate); err != nil {
		return err
	}

	sr, err := strconv.Atoi(*sampleRate)
	if err != nil {
		return fmt.Errorf("invalid sample rate: %w", err)
	}

	defer initEventLog(*dbPath)()

	input := tools.ClusterInput{
		DBPath:      *dbPath,
		DatasetID:   datasetID,
		LocationID:  locationID,
		Name:        name,
		SampleRate:  &sr,
		Description: description,
	}

	output, err := tools.CreateOrUpdateCluster(context.Background(), input)
	if err != nil {
		return fmt.Errorf("creating cluster: %w", err)
	}

	return printJSON(output)
}

// RunClusterUpdate updates an existing cluster.
//
// JSON output schema: same as RunClusterCreate
func RunClusterUpdate(args []string) error {
	fs := flag.NewFlagSet("cluster update", flag.ExitOnError)
	dbPath := fs.String("db", "", "Path to DuckDB database (required)")
	id := fs.String("id", "", "Cluster ID (required)")
	name := fs.String("name", "", "New cluster name (optional)")
	sampleRate := fs.String("sample-rate", "", "New sample rate in Hz (optional)")
	description := fs.String("description", "", "New cluster description (optional)")

	fs.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: skraak cluster update [options]\n\n")
		fmt.Fprintf(os.Stderr, "Update an existing cluster. Only provided fields are updated.\n\n")
		fmt.Fprintf(os.Stderr, "Options:\n")
		fs.PrintDefaults()
		fmt.Fprintf(os.Stderr, "\nExamples:\n")
		fmt.Fprintf(os.Stderr, "  skraak cluster update --db ./db/skraak.duckdb --id clust123 --name \"New Name\"\n")
	}

	if err := fs.Parse(args); err != nil {
		return fmt.Errorf("parsing flags: %w", err)
	}

	if err := checkFlags(fs, "--db", *dbPath, "--id", *id); err != nil {
		return err
	}

	var sr *int
	if *sampleRate != "" {
		srVal, err := strconv.Atoi(*sampleRate)
		if err != nil {
			return fmt.Errorf("invalid sample rate: %w", err)
		}
		sr = &srVal
	}

	defer initEventLog(*dbPath)()

	input := tools.ClusterInput{
		DBPath: *dbPath,
		ID:     id,
	}
	if *name != "" {
		input.Name = name
	}
	if sr != nil {
		input.SampleRate = sr
	}
	if *description != "" {
		input.Description = description
	}

	output, err := tools.CreateOrUpdateCluster(context.Background(), input)
	if err != nil {
		return fmt.Errorf("updating cluster: %w", err)
	}

	return printJSON(output)
}