package config

import "testing"

func clearEnv(t *testing.T) {
	t.Helper()
	keys := []string{
		"DATABASE_URL", "HTTP_PORT", "BASE_URL", "SESSION_SECRET", "UPLOAD_DIR",
		"MAX_UPLOAD_MB", "MEILI_URL", "MEILI_KEY", "SMTP_HOST", "SMTP_PORT",
		"SMTP_USER", "SMTP_PASS", "SMTP_FROM", "GITHUB_CLIENT_ID", "GITHUB_CLIENT_SECRET",
		"GITEA_URL", "GITEA_CLIENT_ID", "GITEA_CLIENT_SECRET", "CULL_AFTER_DAYS", "LOG_LEVEL",
	}
	for _, k := range keys {
		t.Setenv(k, "")
	}
}

func validRequired(t *testing.T) {
	t.Helper()
	t.Setenv("DATABASE_URL", "postgres://localhost/solopm")
	t.Setenv("BASE_URL", "http://localhost:8080")
	t.Setenv("SESSION_SECRET", "01234567890123456789012345678901")
}

func TestLoad_MissingRequired(t *testing.T) {
	clearEnv(t)
	_, err := Load()
	if err == nil {
		t.Fatal("expected error for missing required vars, got nil")
	}
}

func TestLoad_ShortSessionSecret(t *testing.T) {
	clearEnv(t)
	t.Setenv("DATABASE_URL", "postgres://localhost/solopm")
	t.Setenv("BASE_URL", "http://localhost:8080")
	t.Setenv("SESSION_SECRET", "tooshort")
	_, err := Load()
	if err == nil {
		t.Fatal("expected error for short SESSION_SECRET, got nil")
	}
}

func TestLoad_Defaults(t *testing.T) {
	clearEnv(t)
	validRequired(t)
	c, err := Load()
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if c.HTTPPort != "8080" {
		t.Errorf("HTTPPort = %q, want 8080", c.HTTPPort)
	}
	if c.UploadDir != "./uploads" {
		t.Errorf("UploadDir = %q, want ./uploads", c.UploadDir)
	}
	if c.MaxUploadMB != 25 {
		t.Errorf("MaxUploadMB = %d, want 25", c.MaxUploadMB)
	}
	if c.CullAfterDays != 30 {
		t.Errorf("CullAfterDays = %d, want 30", c.CullAfterDays)
	}
	if c.LogLevel != "info" {
		t.Errorf("LogLevel = %q, want info", c.LogLevel)
	}
	if c.SearchEnabled() {
		t.Error("SearchEnabled() = true, want false when MEILI_URL/KEY unset")
	}
	if c.EmailEnabled() {
		t.Error("EmailEnabled() = true, want false when SMTP_HOST unset")
	}
}

func TestLoad_SearchEnabled(t *testing.T) {
	clearEnv(t)
	validRequired(t)
	t.Setenv("MEILI_URL", "http://meilisearch:7700")
	t.Setenv("MEILI_KEY", "key")
	c, err := Load()
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if !c.SearchEnabled() {
		t.Error("SearchEnabled() = false, want true when MEILI_URL/KEY set")
	}
}

func TestLoad_InvalidInt(t *testing.T) {
	clearEnv(t)
	validRequired(t)
	t.Setenv("MAX_UPLOAD_MB", "not-a-number")
	_, err := Load()
	if err == nil {
		t.Fatal("expected error for non-integer MAX_UPLOAD_MB, got nil")
	}
}