package cmd

import (
	"context"
	"fmt"
	"io"
	"log/slog"
	"os"
	"slices"
	"strings"
	"time"

	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces/params"
	"git.bissendorf.co/bissendorf/unifood/m/v2/core/output"
	"git.bissendorf.co/bissendorf/unifood/m/v2/core/services/jlog"
	"github.com/spf13/cobra"
)

type VerbItem struct {
	Name        interfaces.Verb
	Aliases     []string
	Description string
	RunFn       func(ctx context.Context, config *AppConfig, handler interfaces.ResourceHandler, params params.Container, name string) error
}

var verbs = []VerbItem{
	{
		Name:        interfaces.VerbGet,
		Description: "Retrieve a list of resources",
		RunFn: func(ctx context.Context, config *AppConfig, handler interfaces.ResourceHandler, params params.Container, name string) error {
			h, ok := handler.(interfaces.GetHandler)
			if !ok {
				return fmt.Errorf("resource does not support GET")
			}

			// Get items
			items, err := h.Get(ctx, name, params)
			if err != nil {
				return fmt.Errorf("retrieving item failed: %w", err)
			}
			if config.OutputOrderReverse {
				slices.Reverse(items.Items)
			}

			formatterName := strings.ToLower(config.OutputFormatter)
			formatter, exists := output.Formatters[formatterName]
			if !exists {
				return fmt.Errorf("could not find output formatter '%s'", formatterName)
			}

			// Format and output
			formatted, err := formatter.Format(items)
			if err != nil {
				return fmt.Errorf("failed to format output: %w", err)
			}
			_, err = io.Copy(os.Stdout, formatted)
			if err != nil {
				return fmt.Errorf("failed to write output: %w", err)
			}

			return nil
		},
	},
}

func getVerbs(ctx context.Context, config *AppConfig) (commands []*cobra.Command) {
	for _, v := range verbs {
		verbCommand := &cobra.Command{
			Use:     strings.ToLower(string(v.Name)),
			Aliases: v.Aliases,
			Short:   v.Description,
		}

		// Add all resources that can handle this verb
		for _, r := range availableResources {
			if !slices.Contains(r.Verbs, v.Name) {
				continue
			}

			var params params.Container

			resourceCommand := &cobra.Command{
				Use:     r.Name,
				Aliases: r.Aliases,
				Short:   r.Description,
				Args:    cobra.MaximumNArgs(1),
				Run: func(cmd *cobra.Command, args []string) {
					// Configure log
					var logLevel = slog.LevelWarn
					if config.OutputVerbose {
						logLevel = slog.LevelDebug
					}
					logger := jlog.New(logLevel)
					ctx := jlog.ContextWith(context.Background(), logger)
					ctx, cancel := context.WithTimeout(ctx, time.Duration(config.RequestTimeoutSeconds)*time.Second)
					defer cancel()

					// Print config
					if config.PrintConfig {
						logger.WarnContext(ctx, "Printing app config", slog.Any("config", config), slog.Any("parameters", params.ToMap()))
					}

					var name string
					if len(args) > 0 {
						name = args[0]
					}

					err := v.RunFn(ctx, config, r.Handler, params, name)
					if err != nil {
						logger.ErrorContext(ctx, fmt.Sprintf("%s %s failed", strings.ToUpper(string(v.Name)), r.Name), "error", err.Error())
						os.Exit(1)
					}
				},
			}

			// Register parameters
			for _, param := range r.Handler.GetParametersForVerb(v.Name) {
				resourceCommand.Flags().StringVarP(
					params.Register(param.Name, param.ParseFunc),
					param.Name,
					param.ShortHand,
					param.DefaultFunc(),
					param.Description,
				)
			}

			verbCommand.AddCommand(resourceCommand)
		}

		commands = append(commands, verbCommand)
	}

	return
}