package output

import (
	"encoding/json"
	"fmt"
	"os"
	"strings"

	"github.com/kb-search/kb/internal/config"
)

// IsJSON returns true if the configured output format is "json".
func IsJSON() bool {
	return config.Get().DefaultFormat == "json"
}

// PrintJSON pretty-prints data as JSON to stdout.
func PrintJSON(data interface{}) {
	enc := json.NewEncoder(os.Stdout)
	enc.SetIndent("", "  ")
	_ = enc.Encode(data)
}

// PrintTable prints a simple aligned table with headers and rows.
func PrintTable(headers []string, rows [][]string) {
	if len(headers) == 0 {
		return
	}

	// Calculate column widths
	widths := make([]int, len(headers))
	for i, h := range headers {
		widths[i] = len(h)
	}
	for _, row := range rows {
		for i := 0; i < len(row) && i < len(widths); i++ {
			if len(row[i]) > widths[i] {
				widths[i] = len(row[i])
			}
		}
	}

	// Print header
	for i, h := range headers {
		if i > 0 {
			fmt.Print("  ")
		}
		fmt.Printf("%-*s", widths[i], h)
	}
	fmt.Println()

	// Print separator
	for i, w := range widths {
		if i > 0 {
			fmt.Print("  ")
		}
		fmt.Print(strings.Repeat("-", w))
	}
	fmt.Println()

	// Print rows
	for _, row := range rows {
		for i := 0; i < len(headers); i++ {
			if i > 0 {
				fmt.Print("  ")
			}
			val := ""
			if i < len(row) {
				val = row[i]
			}
			fmt.Printf("%-*s", widths[i], val)
		}
		fmt.Println()
	}
}

// PrintKeyValue prints aligned key-value pairs.
func PrintKeyValue(pairs [][]string) {
	maxKey := 0
	for _, p := range pairs {
		if len(p) >= 2 && len(p[0]) > maxKey {
			maxKey = len(p[0])
		}
	}
	for _, p := range pairs {
		if len(p) >= 2 {
			fmt.Printf("%-*s  %s\n", maxKey, p[0]+":", p[1])
		}
	}
}