package cmd

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

	"skraak/tools"
)

// RunLocationCreate creates a new location with GPS coordinates.
//
// JSON output schema:
//
//	{
//	  "location": {
//	    "id": string,            // Location ID (12 characters)
//	    "dataset_id": string,    // Parent dataset ID
//	    "name": string,          // Location name
//	    "latitude": float,       // Latitude in decimal degrees
//	    "longitude": float,      // Longitude in decimal degrees
//	    "description": string,   // Optional description (nullable)
//	    "created_at": string,    // Creation timestamp (RFC3339)
//	    "last_modified": string, // Last modification timestamp (RFC3339)
//	    "active": bool,          // Whether the location is active
//	    "timezone_id": string    // IANA timezone ID
//	  },
//	  "message": string           // Success message
//	}
func RunLocationCreate(args []string) error {
	fs := flag.NewFlagSet("location create", flag.ExitOnError)
	dbPath := fs.String("db", "", "Path to DuckDB database (required)")
	datasetID := fs.String("dataset", "", "Dataset ID (required)")
	name := fs.String("name", "", "Location name (required)")
	lat := fs.String("lat", "", "Latitude in decimal degrees (required)")
	lon := fs.String("lon", "", "Longitude in decimal degrees (required)")
	tz := fs.String("timezone", "", "IANA timezone ID (required, e.g. Pacific/Auckland)")
	description := fs.String("description", "", "Location description (optional)")

	fs.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: skraak location create [options]\n\n")
		fmt.Fprintf(os.Stderr, "Create a new location with GPS coordinates.\n\n")
		fmt.Fprintf(os.Stderr, "Options:\n")
		fs.PrintDefaults()
		fmt.Fprintf(os.Stderr, "\nExamples:\n")
		fmt.Fprintf(os.Stderr, "  skraak location create --db ./db/skraak.duckdb --dataset abc123 --name \"Site A\" --lat -36.85 --lon 174.76 --timezone Pacific/Auckland\n")
	}

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

	if err := checkFlags(fs, "--db", *dbPath, "--dataset", *datasetID, "--name", *name, "--lat", *lat, "--lon", *lon, "--timezone", *tz); err != nil {
		return err
	}

	latitude, err := strconv.ParseFloat(*lat, 64)
	if err != nil {
		return fmt.Errorf("invalid latitude: %w", err)
	}
	longitude, err := strconv.ParseFloat(*lon, 64)
	if err != nil {
		return fmt.Errorf("invalid longitude: %w", err)
	}

	defer initEventLog(*dbPath)()

	input := tools.LocationInput{
		DBPath:      *dbPath,
		DatasetID:   datasetID,
		Name:        name,
		Latitude:    &latitude,
		Longitude:   &longitude,
		TimezoneID:  tz,
		Description: description,
	}

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

	return printJSON(output)
}

// RunLocationUpdate updates an existing location.
//
// JSON output schema: same as RunLocationCreate
func RunLocationUpdate(args []string) error {
	fs := flag.NewFlagSet("location update", flag.ExitOnError)
	dbPath := fs.String("db", "", "Path to DuckDB database (required)")
	id := fs.String("id", "", "Location ID (required)")
	name := fs.String("name", "", "New location name (optional)")
	lat := fs.String("lat", "", "New latitude (optional)")
	lon := fs.String("lon", "", "New longitude (optional)")
	tz := fs.String("timezone", "", "New IANA timezone ID (optional)")
	description := fs.String("description", "", "New location description (optional)")

	fs.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: skraak location update [options]\n\n")
		fmt.Fprintf(os.Stderr, "Update an existing location. 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 location update --db ./db/skraak.duckdb --id loc123 --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
	}

	defer initEventLog(*dbPath)()

	input, err := parseLocationUpdateInput(dbPath, id, name, lat, lon, tz, description)
	if err != nil {
		return err
	}

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

	return printJSON(output)
}

// parseLocationUpdateInput builds a LocationInput from parsed flags, handling optional float parsing.
func parseLocationUpdateInput(dbPath, id, name, lat, lon, tz, description *string) (tools.LocationInput, error) {
	var latitude, longitude *float64
	if *lat != "" {
		latVal, err := strconv.ParseFloat(*lat, 64)
		if err != nil {
			return tools.LocationInput{}, fmt.Errorf("invalid latitude: %w", err)
		}
		latitude = &latVal
	}
	if *lon != "" {
		lonVal, err := strconv.ParseFloat(*lon, 64)
		if err != nil {
			return tools.LocationInput{}, fmt.Errorf("invalid longitude: %w", err)
		}
		longitude = &lonVal
	}

	input := tools.LocationInput{
		DBPath: *dbPath,
		ID:     id,
	}
	if *name != "" {
		input.Name = name
	}
	if latitude != nil {
		input.Latitude = latitude
	}
	if longitude != nil {
		input.Longitude = longitude
	}
	if *tz != "" {
		input.TimezoneID = tz
	}
	if *description != "" {
		input.Description = description
	}
	return input, nil
}