package cmd

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

	"skraak/db"
	"skraak/tools"
)

// RunDataset handles the "dataset" subcommand
func RunDataset(args []string) {
	if len(args) < 1 {
		printDatasetUsage()
		os.Exit(1)
	}

	switch args[0] {
	case "create":
		RunDatasetCreate(args[1:])
	case "update":
		RunDatasetUpdate(args[1:])
	default:
		fmt.Fprintf(os.Stderr, "Unknown dataset subcommand: %s\n\n", args[0])
		printDatasetUsage()
		os.Exit(1)
	}
}

func printDatasetUsage() {
	fmt.Fprintf(os.Stderr, "Usage: skraak dataset <subcommand> [options]\n\n")
	fmt.Fprintf(os.Stderr, "Subcommands:\n")
	fmt.Fprintf(os.Stderr, "  create    Create a new dataset (type defaults to 'structured')\n")
	fmt.Fprintf(os.Stderr, "  update    Update an existing dataset\n")
	fmt.Fprintf(os.Stderr, "\nExamples:\n")
	fmt.Fprintf(os.Stderr, "  skraak dataset create --db ./db/skraak.duckdb --name \"Test Dataset\"\n")
	fmt.Fprintf(os.Stderr, "  skraak dataset create --db ./db/skraak.duckdb --name \"Training Data\" --type train\n")
	fmt.Fprintf(os.Stderr, "  skraak dataset update --db ./db/skraak.duckdb --id abc123 --name \"Updated Name\"\n")
}

func RunDatasetCreate(args []string) {
	fs := flag.NewFlagSet("create dataset", flag.ExitOnError)
	dbPath := fs.String("db", "", "Path to DuckDB database (required)")
	name := fs.String("name", "", "Dataset name (required)")
	dsType := fs.String("type", "structured", "Dataset type: structured (default), unstructured, test, train")
	description := fs.String("description", "", "Dataset description (optional)")

	fs.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: skraak create dataset [options]\n\n")
		fmt.Fprintf(os.Stderr, "Create a new dataset.\n\n")
		fmt.Fprintf(os.Stderr, "Options:\n")
		fs.PrintDefaults()
		fmt.Fprintf(os.Stderr, "\nExamples:\n")
		fmt.Fprintf(os.Stderr, "  skraak create dataset --db ./db/skraak.duckdb --name \"My Dataset\"\n")
		fmt.Fprintf(os.Stderr, "  skraak create dataset --db ./db/skraak.duckdb --name \"Training Data\" --type train --description \"For ML training\"\n")
	}

	if err := fs.Parse(args); err != nil {
		os.Exit(1)
	}

	// Validate required flags
	missing := []string{}
	if *dbPath == "" {
		missing = append(missing, "--db")
	}
	if *name == "" {
		missing = append(missing, "--name")
	}
	if len(missing) > 0 {
		fmt.Fprintf(os.Stderr, "Error: missing required flags: %v\n\n", missing)
		fs.Usage()
		os.Exit(1)
	}

	tools.SetDBPath(*dbPath)

	// Initialize event log
	eventLogPath := *dbPath + ".events.jsonl"
	db.SetEventLogConfig(db.EventLogConfig{
		Enabled: true,
		Path:    eventLogPath,
	})
	defer db.CloseEventLog()

	input := tools.DatasetInput{
		Name:        name,
		Type:        dsType,
		Description: description,
	}

	output, err := tools.CreateOrUpdateDataset(context.Background(), input)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}

	printJSON(output)
}

func RunDatasetUpdate(args []string) {
	fs := flag.NewFlagSet("update dataset", flag.ExitOnError)
	dbPath := fs.String("db", "", "Path to DuckDB database (required)")
	id := fs.String("id", "", "Dataset ID (required)")
	name := fs.String("name", "", "New dataset name")
	dsType := fs.String("type", "", "New dataset type: structured, unstructured, test, train")
	description := fs.String("description", "", "New dataset description")

	fs.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: skraak update dataset [options]\n\n")
		fmt.Fprintf(os.Stderr, "Update an existing dataset. 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 update dataset --db ./db/skraak.duckdb --id abc123 --name \"Updated Name\"\n")
		fmt.Fprintf(os.Stderr, "  skraak update dataset --db ./db/skraak.duckdb --id abc123 --type train\n")
	}

	if err := fs.Parse(args); err != nil {
		os.Exit(1)
	}

	// Validate required flags
	missing := []string{}
	if *dbPath == "" {
		missing = append(missing, "--db")
	}
	if *id == "" {
		missing = append(missing, "--id")
	}
	if len(missing) > 0 {
		fmt.Fprintf(os.Stderr, "Error: missing required flags: %v\n\n", missing)
		fs.Usage()
		os.Exit(1)
	}

	tools.SetDBPath(*dbPath)

	// Initialize event log
	eventLogPath := *dbPath + ".events.jsonl"
	db.SetEventLogConfig(db.EventLogConfig{
		Enabled: true,
		Path:    eventLogPath,
	})
	defer db.CloseEventLog()

	// Build input - only set fields that were provided (non-empty)
	input := tools.DatasetInput{
		ID: id,
	}
	if *name != "" {
		input.Name = name
	}
	if *dsType != "" {
		input.Type = dsType
	}
	if *description != "" {
		input.Description = description
	}

	output, err := tools.CreateOrUpdateDataset(context.Background(), input)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}

	printJSON(output)
}