package cli

import (
	"encoding/json"
	"fmt"
	"io"
	"path/filepath"
	"runtime"
	"strings"
	"time"

	"git.eeqj.de/sneak/secret/internal/vault"
	"github.com/dustin/go-humanize"
	"github.com/fatih/color"
	"github.com/spf13/afero"
	"github.com/spf13/cobra"
)

// Version info - these are set at build time
var ( //nolint:gochecknoglobals // Set at build time
	Version   = "dev"     //nolint:gochecknoglobals // Set at build time
	GitCommit = "unknown" //nolint:gochecknoglobals // Set at build time
)

// InfoOutput represents the system information for JSON output
type InfoOutput struct {
	Version       string    `json:"version"`
	GitCommit     string    `json:"gitCommit"`
	Author        string    `json:"author"`
	License       string    `json:"license"`
	GoVersion     string    `json:"goVersion"`
	DataDirectory string    `json:"dataDirectory"`
	CurrentVault  string    `json:"currentVault"`
	NumVaults     int       `json:"numVaults"`
	NumSecrets    int       `json:"numSecrets"`
	TotalSize     int64     `json:"totalSizeBytes"`
	OldestSecret  time.Time `json:"oldestSecret,omitempty"`
	LatestSecret  time.Time `json:"latestSecret,omitempty"`
}

// newInfoCmd returns the info command
func newInfoCmd() *cobra.Command {
	cli := NewCLIInstance()

	var jsonOutput bool

	cmd := &cobra.Command{
		Use:   "info",
		Short: "Display system information",
		Long:  "Display information about the secret system including version, vault statistics, and storage usage",
		RunE: func(cmd *cobra.Command, _ []string) error {
			return cli.Info(cmd, jsonOutput)
		},
	}

	cmd.Flags().BoolVar(&jsonOutput, "json", false, "Output in JSON format")

	return cmd
}

// Info displays system information
func (cli *Instance) Info(cmd *cobra.Command, jsonOutput bool) error {
	info := InfoOutput{
		Version:       Version,
		GitCommit:     GitCommit,
		Author:        "Jeffrey Paul <sneak@sneak.berlin>",
		License:       "WTFPL",
		GoVersion:     runtime.Version(),
		DataDirectory: cli.stateDir,
	}

	// Get current vault
	currentVault, err := vault.GetCurrentVault(cli.fs, cli.stateDir)
	if err == nil {
		info.CurrentVault = currentVault.Name
	}

	// Count vaults
	vaultsDir := filepath.Join(cli.stateDir, "vaults.d")
	vaultEntries, err := afero.ReadDir(cli.fs, vaultsDir)
	if err == nil {
		for _, entry := range vaultEntries {
			if entry.IsDir() {
				info.NumVaults++
			}
		}
	}

	// Gather statistics from all vaults
	if info.NumVaults > 0 {
		totalSecrets, totalSize, oldestTime, latestTime, _ := gatherVaultStats(cli.fs, vaultsDir)
		info.NumSecrets = totalSecrets
		info.TotalSize = totalSize
		if !oldestTime.IsZero() {
			info.OldestSecret = oldestTime
		}
		if !latestTime.IsZero() {
			info.LatestSecret = latestTime
		}
	}

	if jsonOutput {
		encoder := json.NewEncoder(cmd.OutOrStdout())
		encoder.SetIndent("", "  ")

		return encoder.Encode(info)
	}

	// Pretty print with colors and emoji
	return prettyPrintInfo(cmd.OutOrStdout(), info)
}

// prettyPrintInfo formats and prints the info in a pretty format
func prettyPrintInfo(w io.Writer, info InfoOutput) error {
	const separatorLength = 40

	bold := color.New(color.Bold)
	green := color.New(color.FgGreen)
	cyan := color.New(color.FgCyan)
	yellow := color.New(color.FgYellow)
	magenta := color.New(color.FgMagenta)

	_, _ = fmt.Fprintln(w)
	_, _ = bold.Fprintln(w, "🔐 Secret System Information")
	_, _ = fmt.Fprintln(w, strings.Repeat("─", separatorLength))

	_, _ = fmt.Fprintf(w, "📦 Version:          %s\n", green.Sprint(info.Version))
	_, _ = fmt.Fprintf(w, "🔧 Git Commit:       %s\n", cyan.Sprint(info.GitCommit))
	_, _ = fmt.Fprintf(w, "👤 Author:           %s\n", cyan.Sprint(info.Author))
	_, _ = fmt.Fprintf(w, "📜 License:          %s\n", cyan.Sprint(info.License))
	_, _ = fmt.Fprintf(w, "🐹 Go Version:       %s\n", cyan.Sprint(info.GoVersion))
	_, _ = fmt.Fprintf(w, "📁 Data Directory:   %s\n", yellow.Sprint(info.DataDirectory))

	if info.CurrentVault != "" {
		_, _ = fmt.Fprintf(w, "🗄️  Current Vault:    %s\n", magenta.Sprint(info.CurrentVault))
	} else {
		_, _ = fmt.Fprintf(w, "🗄️  Current Vault:    %s\n", color.RedString("(none)"))
	}

	_, _ = fmt.Fprintln(w, strings.Repeat("─", separatorLength))

	_, _ = fmt.Fprintf(w, "🗂️  Vaults:           %s\n", bold.Sprint(info.NumVaults))
	_, _ = fmt.Fprintf(w, "🔑 Secrets:          %s\n", bold.Sprint(info.NumSecrets))
	if info.TotalSize >= 0 {
		//nolint:gosec // TotalSize is always >= 0
		_, _ = fmt.Fprintf(w, "💾 Total Size:       %s\n", bold.Sprint(humanize.Bytes(uint64(info.TotalSize))))
	} else {
		_, _ = fmt.Fprintf(w, "💾 Total Size:       %s\n", bold.Sprint("0 B"))
	}

	if !info.OldestSecret.IsZero() {
		_, _ = fmt.Fprintf(w, "🕰️  Oldest Secret:    %s\n", info.OldestSecret.Format("2006-01-02 15:04:05"))
	}
	if !info.LatestSecret.IsZero() {
		_, _ = fmt.Fprintf(w, "✨ Latest Secret:    %s\n", info.LatestSecret.Format("2006-01-02 15:04:05"))
	}

	_, _ = fmt.Fprintln(w)

	return nil
}