package main

import (
	"fmt"
	"strings"

	"github.com/chzyer/readline"
	"github.com/fatih/color"
)

// Color helpers
var (
	cyan    = color.New(color.FgCyan).SprintFunc()
	green   = color.New(color.FgGreen).SprintFunc()
	yellow  = color.New(color.FgYellow).SprintFunc()
	red     = color.New(color.FgRed).SprintFunc()
	magenta = color.New(color.FgMagenta).SprintFunc()
)

// parseCommand parses command line respecting quotes
func parseCommand(line string) []string {
	var parts []string
	var current strings.Builder
	var quoteChar rune = 0 // Use a rune to store the active quote character (' or ")

	for _, ch := range line {
		switch {
		// If we see a quote character
		case ch == '\'' || ch == '"':
			if quoteChar == 0 {
				// Not currently inside a quoted string, so start one
				quoteChar = ch
			} else if quoteChar == ch {
				// Inside a quoted string and found the matching quote, so end it
				quoteChar = 0
			} else {
				// Inside a quoted string but found the *other* type of quote, treat it as a literal character
				current.WriteRune(ch)
			}
		// If we see a space or tab and are NOT inside a quoted string
		case (ch == ' ' || ch == '\t') && quoteChar == 0:
			if current.Len() > 0 {
				parts = append(parts, current.String())
				current.Reset()
			}
		// Any other character
		default:
			current.WriteRune(ch)
		}
	}

	// Add the last part if it exists
	if current.Len() > 0 {
		parts = append(parts, current.String())
	}

	return parts
}

// printJSONError displays a user-friendly JSON parsing error with helpful hints
func printJSONError(input string, err error) {
	fmt.Println(red("❌ Invalid JSON:"), err)
	fmt.Println()

	// Show what was received
	if len(input) > 100 {
		fmt.Println(yellow("Received:"), input[:100]+"...")
	} else {
		fmt.Println(yellow("Received:"), input)
	}
	fmt.Println()

	// Provide helpful hints based on common errors
	errMsg := err.Error()

	if strings.Contains(errMsg, "looking for beginning of") ||
		strings.Contains(errMsg, "invalid character") {
		fmt.Println(cyan("💡 Tip:"), "JSON with spaces needs quotes:")
		fmt.Println(green("  ✓ Correct:"), "put key '{\"hello\":\"world\"}'")
		fmt.Println(green("  ✓ Correct:"), "put key '{\"a\":1,\"b\":2}'")
		fmt.Println(green("  ✓ Compact:"), "put key {\"a\":1,\"b\":2}  (no spaces)")
		fmt.Println(red("  ✗ Wrong:  "), "put key {\"a\": 1, \"b\": 2}  (spaces without quotes)")
	} else if strings.Contains(errMsg, "unexpected end of JSON") {
		fmt.Println(cyan("💡 Tip:"), "JSON appears incomplete or cut off")
		fmt.Println(green("  Check:"), "Are all brackets/braces matched? {}, []")
		fmt.Println(green("  Check:"), "Did spaces split your JSON into multiple arguments?")
	} else {
		fmt.Println(cyan("💡 Tip:"), "Wrap JSON in quotes for complex values:")
		fmt.Println(green("  Single quotes:"), "put key '{\"your\":\"json\"}'")
		fmt.Println(green("  Double quotes:"), "put key \"{\\\"your\\\":\\\"json\\\"}\"")
	}
}

// Auto-completion setup
var completer = readline.NewPrefixCompleter(
	readline.PcItem("connect"),
	readline.PcItem("auth"),
	readline.PcItem("profile",
		readline.PcItem("add"),
		readline.PcItem("use"),
		readline.PcItem("remove"),
	),
	readline.PcItem("get"),
	readline.PcItem("put"),
	readline.PcItem("delete"),
	readline.PcItem("meta",
		readline.PcItem("get"),
		readline.PcItem("set",
			readline.PcItem("--owner"),
			readline.PcItem("--group"),
			readline.PcItem("--permissions"),
		),
	),
	readline.PcItem("members"),
	readline.PcItem("health"),
	readline.PcItem("user",
		readline.PcItem("get"),
		readline.PcItem("create"),
	),
	readline.PcItem("help"),
	readline.PcItem("exit"),
	readline.PcItem("quit"),
	readline.PcItem("clear"),
)