1 files changed, 100 insertions, 0 deletions
diff --git a/internal/cli/check.go b/internal/cli/check.go
new file mode 100644
index 0000000..1df5137
--- /dev/null
+++ b/internal/cli/check.go
@@ -0,0 +1,100 @@
+package cli
+
+import (
+	"fmt"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+
+	"github.com/hachem-wtf/benson/internal/config"
+	"github.com/hachem-wtf/benson/internal/modrinth"
+)
+
+type compatMod struct {
+	slug     string
+	filename string
+}
+
+type checkResult struct {
+	compatible   []compatMod
+	incompatible []string
+	failed       []string
+}
+
+func runCheck(m *model) tea.Cmd {
+	m.busy = true
+	cfg := m.cfg
+	return tea.Batch(m.spin.Tick, func() tea.Msg {
+		return outputMsg{text: checkReport(cfg)}
+	})
+}
+
+func checkReport(cfg *config.Config) string {
+	client := modrinth.NewClient()
+	var res checkResult
+
+	for _, slug := range cfg.ModrinthMods {
+		versions, err := client.GetVersions(slug)
+		if err != nil {
+			res.failed = append(res.failed, slug)
+			continue
+		}
+
+		match := modrinth.CompatibleVersion(versions, cfg.MinecraftVersion, "fabric")
+		if match == nil {
+			res.incompatible = append(res.incompatible, slug)
+			continue
+		}
+
+		filename := match.VersionNumber
+		if len(match.Files) > 0 {
+			filename = match.Files[0].Filename
+		}
+		res.compatible = append(res.compatible, compatMod{slug: slug, filename: filename})
+	}
+
+	return renderCheck(cfg, res)
+}
+
+func renderCheck(cfg *config.Config, res checkResult) string {
+	rows := []string{
+		headingStyle.Render(fmt.Sprintf("Compatibility · MC %s · Fabric", cfg.MinecraftVersion)),
+		"",
+	}
+
+	if len(res.compatible) > 0 {
+		rows = append(rows, successStyle.Render("Compatible"))
+		for _, c := range res.compatible {
+			rows = append(rows, "  "+successStyle.Render("✓ ")+c.slug+mutedStyle.Render(" → "+c.filename))
+		}
+		rows = append(rows, "")
+	}
+
+	if len(res.incompatible) > 0 {
+		rows = append(rows, errorStyle.Render("No compatible version"))
+		for _, slug := range res.incompatible {
+			rows = append(rows, "  "+errorStyle.Render("✗ ")+slug)
+		}
+		rows = append(rows, "")
+	}
+
+	if len(res.failed) > 0 {
+		rows = append(rows, warnStyle.Render("Failed to check"))
+		for _, slug := range res.failed {
+			rows = append(rows, "  "+warnStyle.Render("! ")+slug)
+		}
+		rows = append(rows, "")
+	}
+
+	total := len(cfg.ModrinthMods)
+	ok := len(res.compatible)
+	rows = append(rows, mutedStyle.Render(fmt.Sprintf("Summary: %d/%d mods compatible", ok, total)))
+
+	if len(res.incompatible) == 0 && len(res.failed) == 0 {
+		rows = append(rows, successStyle.Render("Safe to generate."))
+	} else {
+		rows = append(rows, warnStyle.Render("Not all mods are compatible — generate may have issues."))
+	}
+
+	return lipgloss.JoinVertical(lipgloss.Left, rows...)
+}