package cmd

import (
	"fmt"
	"sort"
	"strings"

	"forgejo.zerova.net/public/fgj-sid/internal/config"
	"github.com/spf13/cobra"
)

var loginsCmd = &cobra.Command{
	Use:   "logins",
	Short: "Manage configured Forgejo/Gitea logins",
	Long: `Manage configured Forgejo/Gitea logins.

This is a complementary command to 'fgj auth' using the noun vocabulary
familiar to users of tea. Use 'fgj auth login' to add a new login and
'fgj auth logout' to remove one.`,
}

var loginsListCmd = &cobra.Command{
	Use:     "list",
	Aliases: []string{"ls"},
	Short:   "List all configured logins",
	Long:    "List all configured Forgejo/Gitea logins with their hostname, user, protocol, default flag, and match_dirs.",
	RunE:    runLoginsList,
}

var loginsDefaultCmd = &cobra.Command{
	Use:   "default [hostname]",
	Short: "Get or set the default login",
	Long: `Get or set the default login.

With no argument, prints the currently-configured default hostname
(or "no default set" if none is configured).

With a hostname argument, marks that login as the default and unsets
the default flag on all other logins.`,
	Args: cobra.MaximumNArgs(1),
	RunE: runLoginsDefault,
}

func init() {
	rootCmd.AddCommand(loginsCmd)
	loginsCmd.AddCommand(loginsListCmd)
	loginsCmd.AddCommand(loginsDefaultCmd)

	addJSONFlags(loginsListCmd, "Output logins as JSON")
}

// loginEntry is the JSON representation of a configured login.
type loginEntry struct {
	Hostname    string   `json:"hostname"`
	User        string   `json:"user"`
	GitProtocol string   `json:"git_protocol"`
	Default     bool     `json:"default"`
	MatchDirs   []string `json:"match_dirs"`
}

func runLoginsList(cmd *cobra.Command, args []string) error {
	cfg, err := config.Load()
	if err != nil {
		return fmt.Errorf("failed to load config: %w", err)
	}

	hostnames := make([]string, 0, len(cfg.Hosts))
	for hostname := range cfg.Hosts {
		hostnames = append(hostnames, hostname)
	}

	// Sort by config-file order; fall back to alphabetical when Order is
	// equal (e.g., both zero because the config was constructed in-memory
	// rather than loaded from disk).
	sort.Slice(hostnames, func(i, j int) bool {
		a, b := cfg.Hosts[hostnames[i]], cfg.Hosts[hostnames[j]]
		if a.Order != b.Order {
			return a.Order < b.Order
		}
		return hostnames[i] < hostnames[j]
	})

	if wantJSON(cmd) {
		entries := make([]loginEntry, 0, len(hostnames))
		for _, hostname := range hostnames {
			h := cfg.Hosts[hostname]
			dirs := h.MatchDirs
			if dirs == nil {
				dirs = []string{}
			}
			entries = append(entries, loginEntry{
				Hostname:    hostname,
				User:        h.User,
				GitProtocol: h.GitProtocol,
				Default:     h.Default,
				MatchDirs:   dirs,
			})
		}
		return outputJSON(cmd, entries)
	}

	if len(hostnames) == 0 {
		fmt.Fprintln(ios.Out, "No logins configured")
		fmt.Fprintln(ios.Out, "Run 'fgj auth login' to add a login")
		return nil
	}

	tp := ios.NewTablePrinter()
	tp.AddHeader("HOSTNAME", "USER", "PROTOCOL", "DEFAULT", "MATCH_DIRS")
	for _, hostname := range hostnames {
		h := cfg.Hosts[hostname]
		defaultMark := ""
		if h.Default {
			defaultMark = "*"
		}
		tp.AddRow(
			hostname,
			h.User,
			h.GitProtocol,
			defaultMark,
			strings.Join(h.MatchDirs, ", "),
		)
	}
	return tp.Render()
}

func runLoginsDefault(cmd *cobra.Command, args []string) error {
	cfg, err := config.Load()
	if err != nil {
		return fmt.Errorf("failed to load config: %w", err)
	}

	if len(args) == 0 {
		current := cfg.DefaultHost()
		if current == "" {
			fmt.Fprintln(ios.Out, "no default set")
			return nil
		}
		fmt.Fprintln(ios.Out, current)
		return nil
	}

	target := args[0]
	if _, ok := cfg.Hosts[target]; !ok {
		return fmt.Errorf("no configuration found for host %s", target)
	}

	for hostname, h := range cfg.Hosts {
		h.Default = (hostname == target)
		cfg.Hosts[hostname] = h
	}

	if err := cfg.Save(); err != nil {
		return fmt.Errorf("failed to save config: %w", err)
	}

	cs := ios.ColorScheme()
	fmt.Fprintf(ios.Out, "%s Default host set to %s\n", cs.SuccessIcon(), target)
	return nil
}