package main

import (
	"context"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"git.golem15.com/golem15/summercms/bonfire"
	"git.golem15.com/golem15/summercms/internal/build"
)

func delegateCommand(name, description string) bonfire.Command {
	return bonfire.Command{
		Name:        name,
		Description: description,
		Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
			argv := []string{name}
			argv = append(argv, in.Args()...)
			return runAppBinary(ctx, argv, out)
		},
	}
}

func delegateRollbackCommand() bonfire.Command {
	return bonfire.Command{
		Name:        "migrate:rollback",
		Description: "Roll back the last migration of a plugin in the app binary",
		Flags: []bonfire.Flag{{
			Name:        "plugin",
			Description: "Plugin ID whose last migration to roll back",
		}},
		Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
			argv := []string{"migrate:rollback"}
			if plugin, ok := in.Flag("plugin"); ok && plugin != "" {
				argv = append(argv, "--plugin", plugin)
			}
			argv = append(argv, in.Args()...)
			return runAppBinary(ctx, argv, out)
		},
	}
}

func runAppBinary(ctx context.Context, argv []string, out bonfire.Output) error {
	if len(argv) == 0 {
		return fmt.Errorf("summer: missing app command")
	}
	dir, err := os.Getwd()
	if err != nil {
		return err
	}
	appDir, err := build.FindAppDir(dir)
	if err != nil {
		return err
	}
	m, err := build.LoadManifest(filepath.Join(appDir, "summer.yaml"))
	if err != nil {
		return err
	}
	bin := filepath.Join(appDir, "bin", m.Binary)
	if _, err := os.Stat(bin); err != nil {
		if err := build.App(ctx, appDir, out); err != nil {
			return err
		}
	}
	self, err := os.Executable()
	if err == nil {
		if same, _ := sameFile(self, bin); same {
			return fmt.Errorf("summer: refusing to recurse into %s", bin)
		}
	}
	cmd := exec.CommandContext(ctx, bin, argv...)
	cmd.Dir = appDir
	cmd.Stdout = out
	cmd.Stderr = out
	cmd.Stdin = os.Stdin
	cmd.Env = os.Environ()
	if err := cmd.Run(); err != nil {
		return fmt.Errorf("summer: %s: %w", strings.Join(argv, " "), err)
	}
	return nil
}

func sameFile(a, b string) (bool, error) {
	ai, err := os.Stat(a)
	if err != nil {
		return false, err
	}
	bi, err := os.Stat(b)
	if err != nil {
		return false, err
	}
	return os.SameFile(ai, bi), nil
}