package main

import (
	"fmt"
	"path/filepath"
)

func init() {
	register(Check{
		Seq:   200,
		ID:    "20",
		Title: "Tailwind v4 configuration (PostCSS, CSS directives, @config)",
		Run: func(ctx *ScanContext, rep *Reporter) {
			// Check 20: Tailwind v4 configuration
			fmt.Println("\n=== Check 20: Tailwind v4 configuration (PostCSS, CSS directives, @config) ===")
			if len(ctx.frontendTargets) > 0 {
				var twViolations []tailwindViolation
				for _, target := range ctx.frontendTargets {
					if target.pluginRules {
						continue // Plugin frontends don't have their own PostCSS/Tailwind setup
					}
					for _, v := range checkTailwindV4(target.dir) {
						v.file = filepath.Clean(prefixDisplayPath(target.label, v.file))
						twViolations = append(twViolations, v)
					}
				}
				if len(twViolations) > 0 {
					fmt.Printf("  FAIL: %d Tailwind v4 configuration issue(s):\n", len(twViolations))
					for _, v := range twViolations {
						if v.line > 0 {
							fmt.Printf("    %s:%d [%s] %s\n", v.file, v.line, v.rule, v.snippet)
						} else {
							fmt.Printf("    %s [%s] %s\n", v.file, v.rule, v.snippet)
						}
					}
					fmt.Println("\n  Fix:")
					fmt.Println("    postcss-v4-plugin     → use '@tailwindcss/postcss': {} instead of tailwindcss: {}")
					fmt.Println("    postcss-no-autoprefixer → remove autoprefixer (built into Tailwind v4)")
					fmt.Println("    css-v4-import         → replace @tailwind base/components/utilities with @import \"tailwindcss\"")
					fmt.Println("    css-missing-config    → add @config \"../tailwind.config.ts\" to your CSS entry point")
					rep.Fail()
				} else {
					fmt.Println("  OK: Tailwind v4 configuration is correct")
					printPerTargetOKLines(frontendTargetLabels(ctx.frontendTargets))
				}
			} else {
				fmt.Println("  SKIP: no frontend sources found")
			}
		},
	})
}