package main

import (
	"context"
	"fmt"
	"log/slog"
	"os"
	"text/tabwriter"
	"time"

	"github.com/urfave/cli/v3"
	tlog "tangled.org/core/log"
	"tangled.org/core/spindle"
	"tangled.org/core/spindle/db"
	"tangled.org/core/spindle/mill"
)

func main() {
	cmd := &cli.Command{
		Name:  "spindle",
		Usage: "spindle continuous integration runner",
		Commands: []*cli.Command{
			Command(),
			millCommand(),
		},
		DefaultCommand: "run",
	}

	logger := tlog.New("spindle")
	slog.SetDefault(logger)

	ctx := context.Background()
	ctx = tlog.IntoContext(ctx, logger)

	if err := cmd.Run(ctx, os.Args); err != nil {
		logger.Error(err.Error())
		os.Exit(-1)
	}
}

func Command() *cli.Command {
	return &cli.Command{
		Name:  "run",
		Usage: "run the spindle server",
		Action: func(ctx context.Context, cmd *cli.Command) error {
			return spindle.Run(ctx)
		},
	}
}

// millCommand groups mill-host administration. Executors allowed to join the
// mill are managed under `mill executor`.
func millCommand() *cli.Command {
	dbFlag := &cli.StringFlag{
		Name:    "db",
		Usage:   "path to the spindle sqlite db",
		Value:   "spindle.db",
		Sources: cli.EnvVars("SPINDLE_SERVER_DB_PATH"),
	}
	openDB := func(ctx context.Context, cmd *cli.Command) (*db.DB, error) {
		return db.Make(ctx, cmd.String("db"))
	}
	return &cli.Command{
		Name:  "mill",
		Usage: "mill host administration",
		Commands: []*cli.Command{
			{
				Name:  "executor",
				Usage: "manage executors allowed to join this mill",
				Commands: []*cli.Command{
					{
						Name:      "add",
						Usage:     "register an executor and print its token",
						ArgsUsage: "<name>",
						Flags: []cli.Flag{
							dbFlag,
							&cli.DurationFlag{
								Name:  "ttl",
								Usage: "token lifetime (e.g. 720h); omit for no expiry",
							},
						},
						Action: func(ctx context.Context, cmd *cli.Command) error {
							name := cmd.Args().First()
							if name == "" {
								return fmt.Errorf("usage: spindle mill executor add <name>")
							}
							d, err := openDB(ctx, cmd)
							if err != nil {
								return err
							}
							token, err := mill.GenerateToken()
							if err != nil {
								return err
							}
							var expiresAt *time.Time
							if ttl := cmd.Duration("ttl"); ttl > 0 {
								exp := time.Now().UTC().Add(ttl)
								expiresAt = &exp
							}
							if err := d.AddExecutorToken(name, mill.HashToken(token), expiresAt); err != nil {
								return fmt.Errorf("registering executor %q: %w", name, err)
							}
							fmt.Println(token)
							return nil
						},
					},
					{
						Name:  "list",
						Usage: "list registered executors",
						Flags: []cli.Flag{dbFlag},
						Action: func(ctx context.Context, cmd *cli.Command) error {
							d, err := openDB(ctx, cmd)
							if err != nil {
								return err
							}
							tokens, err := d.ListExecutorTokens()
							if err != nil {
								return err
							}
							w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
							fmt.Fprintln(w, "NAME\tCREATED\tEXPIRES")
							for _, t := range tokens {
								expires := "never"
								if t.ExpiresAt != nil {
									expires = t.ExpiresAt.Format(time.RFC3339)
									if time.Now().After(*t.ExpiresAt) {
										expires += " (expired)"
									}
								}
								fmt.Fprintf(w, "%s\t%s\t%s\n", t.Name, t.CreatedAt, expires)
							}
							return w.Flush()
						},
					},
					{
						Name:      "revoke",
						Usage:     "revoke an executor's token",
						ArgsUsage: "<name>",
						Flags:     []cli.Flag{dbFlag},
						Action: func(ctx context.Context, cmd *cli.Command) error {
							name := cmd.Args().First()
							if name == "" {
								return fmt.Errorf("usage: spindle mill executor revoke <name>")
							}
							d, err := openDB(ctx, cmd)
							if err != nil {
								return err
							}
							ok, err := d.RevokeExecutorToken(name)
							if err != nil {
								return err
							}
							if !ok {
								return fmt.Errorf("no such executor identity %q", name)
							}
							return nil
						},
					},
				},
			},
		},
	}
}
