package main

import (
	"fmt"
	"sort"
	"strings"
)

// hintForColor returns a likely semantic replacement for a hardcoded color snippet.
// This is intentionally approximate and is used only in the consolidated fix block.
func hintForColor(snippet string) string {
	s := strings.ToLower(snippet)

	for _, prefix := range []string{
		"bg-", "text-", "border-", "ring-", "shadow-", "outline-",
		"decoration-", "divide-", "from-", "to-", "via-", "fill-", "stroke-",
		"accent-", "caret-", "placeholder-",
	} {
		_, after, ok := strings.Cut(s, prefix)
		if !ok {
			continue
		}
		twPrefix := prefix[:len(prefix)-1]

		isLowShadeBg := false
		if twPrefix == "bg" || twPrefix == "from" || twPrefix == "to" || twPrefix == "via" {
			for _, low := range []string{"-50", "-100", "-200"} {
				if strings.Contains(after, low) {
					isLowShadeBg = true
					break
				}
			}
		}

		switch {
		case strings.HasPrefix(after, "green") || strings.HasPrefix(after, "emerald") || strings.HasPrefix(after, "lime"):
			if isLowShadeBg {
				return twPrefix + "-success/10"
			}
			return twPrefix + "-success"
		case strings.HasPrefix(after, "red") || strings.HasPrefix(after, "rose"):
			if isLowShadeBg {
				return twPrefix + "-destructive/10"
			}
			return twPrefix + "-destructive"
		case strings.HasPrefix(after, "amber") || strings.HasPrefix(after, "yellow") || strings.HasPrefix(after, "orange"):
			if isLowShadeBg {
				return twPrefix + "-warning/10"
			}
			return twPrefix + "-warning"
		case strings.HasPrefix(after, "blue") || strings.HasPrefix(after, "sky") || strings.HasPrefix(after, "cyan"):
			if isLowShadeBg {
				return twPrefix + "-info/10"
			}
			return twPrefix + "-info"
		case strings.HasPrefix(after, "indigo"):
			return twPrefix + "-primary"
		case strings.HasPrefix(after, "purple") || strings.HasPrefix(after, "violet") || strings.HasPrefix(after, "fuchsia") || strings.HasPrefix(after, "pink") || strings.HasPrefix(after, "teal"):
			return twPrefix + "-accent"
		case strings.HasPrefix(after, "gray") || strings.HasPrefix(after, "slate") || strings.HasPrefix(after, "zinc") || strings.HasPrefix(after, "neutral") || strings.HasPrefix(after, "stone"):
			if twPrefix == "text" {
				return "text-muted-foreground"
			}
			return twPrefix + "-muted"
		}
	}

	if strings.Contains(s, "#") || strings.Contains(s, "rgb") || strings.Contains(s, "hsl") {
		return "hsl(var(--token))"
	}

	return ""
}

func formatColorViolations(scope string, violations []colorViolation) string {
	if len(violations) == 0 {
		return ""
	}

	sorted := append([]colorViolation(nil), violations...)
	sort.Slice(sorted, func(i, j int) bool {
		if sorted[i].file != sorted[j].file {
			return sorted[i].file < sorted[j].file
		}
		if sorted[i].line != sorted[j].line {
			return sorted[i].line < sorted[j].line
		}
		if sorted[i].rule != sorted[j].rule {
			return sorted[i].rule < sorted[j].rule
		}
		return sorted[i].snippet < sorted[j].snippet
	})

	var out strings.Builder
	fmt.Fprintf(&out, "  FAIL: %d hardcoded color(s) in %s:\n", len(sorted), scope)

	currentFile := ""
	for _, v := range sorted {
		if v.file != currentFile {
			fmt.Fprintf(&out, "    %s\n", v.file)
			currentFile = v.file
		}
		if v.line > 0 {
			fmt.Fprintf(&out, "      %d [%s] %s\n", v.line, v.rule, v.snippet)
			continue
		}
		fmt.Fprintf(&out, "      [%s] %s\n", v.rule, v.snippet)
	}

	return strings.TrimRight(out.String(), "\n")
}

func collectColorHints(violationGroups ...[]colorViolation) []string {
	seen := make(map[string]bool)
	var hints []string

	for _, violations := range violationGroups {
		for _, v := range violations {
			hint := hintForColor(v.snippet)
			if hint == "" || seen[hint] {
				continue
			}
			seen[hint] = true
			hints = append(hints, hint)
		}
	}

	sort.Strings(hints)
	if len(hints) > 5 {
		hints = append(hints[:5], "...")
	}

	return hints
}

func printColorFixInstructions(violationGroups ...[]colorViolation) {
	fmt.Println("  Fix:")
	if hints := collectColorHints(violationGroups...); len(hints) > 0 {
		fmt.Printf("    1. Likely replacements for this batch: %s\n", strings.Join(hints, ", "))
		fmt.Println("    2. Replace literals with semantic tokens or CSS vars where needed.")
	} else {
		fmt.Println("    1. Replace literals with semantic tokens or CSS vars.")
	}
	fmt.Println("    3. Tailwind token surface: tools/tailwind-service/input.base.css")
	fmt.Println("    4. Runtime theme variable generation: internal/theme/css.go")
	fmt.Println("    5. Plugin CSS examples: internal/plugins/defaultplugin/assets/style.css")
}