package appcli

import (
	"context"
	"errors"

	"gitea.auvem.com/go-toolkit/app"
	"github.com/urfave/cli/v3"
)

// DepFn is a function type that returns a slice of dependencies.
type DepFn func(*app.Lifecycle, *cli.Command) ([]*app.Module, error)

// DepList is a convenience function that returns a DepFn that uses a
// predefined list of dependecies.
func DepList(deps ...*app.Module) DepFn {
	return func(_ *app.Lifecycle, _ *cli.Command) ([]*app.Module, error) {
		if len(deps) == 0 {
			return nil, errors.New("no dependencies provided")
		}
		return deps, nil
	}
}

// NewCommand creates a new CLI command with the specified configuration and
// and dependencies. Returns a standard *cli.Command that can be used directly
// with urfave/cli/v3 types. If any dependencies are provided, the Before method
// is overriden to ensure that all dependencies are satisfied before the command
// is executed. Requires an app.Lifecycle to be present in the context when the
// command is executed.
func NewCommand(cmdcfg *cli.Command, depfn DepFn) *cli.Command {
	if depfn == nil {
		return cmdcfg
	}

	// Override the Before method to handle dependencies
	originalBefore := cmdcfg.Before
	cmdcfg.Before = func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
		if originalBefore != nil {
			var err error
			ctx, err = originalBefore(ctx, cmd)
			if err != nil {
				return ctx, err
			}
		}

		lifecycle := app.LifecycleFromContext(ctx)
		if lifecycle == nil {
			return ctx, errors.New("lifecycle not found in context, cannot run command with dependencies")
		}

		deps, err := depfn(lifecycle, cmd)
		if err != nil {
			return ctx, err
		}

		if err := lifecycle.Require(deps...); err != nil {
			return ctx, err
		}
		return ctx, nil
	}

	return cmdcfg
}

// RootCommandOpts defines the options for creating a root command.
type RootCommandOpts struct {
	// Command is the base command configuration.
	Command *cli.Command

	// DepFn is a function that returns the modules that this command depends
	// on. Note: All root dependencies will be inherited by all subcommands.
	DepFn DepFn
}

// NewRootCommand creates a new root CLI command with the specified configuration.
// Override Before and After to take over app.Lifecycle setup and teardown. Adds
// a verbose flag. See NewCommand for more details on how dependencies are handled.
// Requires an app.Lifecycle to be present in the context when the command is executed.
func NewRootCommand(rootcfg *RootCommandOpts) *cli.Command {
	cmdcfg := rootcfg.Command

	cmdcfg.Flags = append(cmdcfg.Flags, &cli.BoolFlag{
		Name:    "verbose",
		Aliases: []string{"v"},
		Usage:   "Enable verbose output",
	})

	// Override the before method to handle logger and lifecycle
	originalBefore := cmdcfg.Before
	cmdcfg.Before = func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
		if originalBefore != nil {
			var err error
			ctx, err = originalBefore(ctx, cmd)
			if err != nil {
				return ctx, err
			}
		}

		lifecycle := app.LifecycleFromContext(ctx)
		if lifecycle == nil {
			return ctx, errors.New("lifecycle not found in context, run root command")
		}

		if err := lifecycle.Setup(); err != nil {
			return ctx, err
		}

		return ctx, nil
	}

	// Override the After method to handle cleanup if needed
	originalAfter := cmdcfg.After
	cmdcfg.After = func(ctx context.Context, cmd *cli.Command) error {
		if originalAfter != nil {
			if err := originalAfter(ctx, cmd); err != nil {
				return err
			}
		}

		lifecycle := app.LifecycleFromContext(ctx)
		if lifecycle == nil {
			return errors.New("lifecycle not found in context, cannot clean up root command")
		}

		if err := lifecycle.Teardown(); err != nil {
			return err
		}

		return nil
	}

	return NewCommand(cmdcfg, rootcfg.DepFn)
}

// VerboseFromCommand checks if the verbose flag is set in the command context.
func VerboseFromCommand(cmd *cli.Command) bool {
	if cmd == nil {
		return false
	}

	return cmd.Bool("verbose")
}