package config

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestGenerateAndLoadRoundTrip(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "settings.ini")

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load (generate): %v", err)
	}
	if _, err := os.Stat(path); err != nil {
		t.Fatalf("settings.ini was not written: %v", err)
	}
	if got := cfg.Section("Server").Key("SMTP_PORT").String(); got != "25" {
		t.Errorf("SMTP_PORT = %q, want 25", got)
	}
	if got := cfg.Section("Attachments").Key("attachments_path").String(); got == "" {
		t.Error("Attachments.attachments_path default is missing (the approved bug fix)")
	}

	// Load again against the now-existing file — must not regenerate/overwrite.
	cfg2, err := Load(path)
	if err != nil {
		t.Fatalf("Load (existing): %v", err)
	}
	if got := cfg2.Section("Server").Key("SMTP_PORT").String(); got != "25" {
		t.Errorf("second Load: SMTP_PORT = %q, want 25", got)
	}
}

func TestLoadBackfillsMissingKeysWithoutTouchingExistingValues(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "settings.ini")

	// Simulate an older settings.ini written before [LetsEncryptHTTP] and [TLS]'s
	// *_cert keys existed, with a deliberately non-default value on a key that IS
	// already present — Load must never touch that.
	old := "[Server]\nHOSTNAME = old.example.com\n\n[TLS]\ntls_cert_file = custom/path.crt\n"
	if err := os.WriteFile(path, []byte(old), 0o644); err != nil {
		t.Fatal(err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if got := cfg.Section("Server").Key("HOSTNAME").String(); got != "old.example.com" {
		t.Errorf("existing value clobbered: HOSTNAME = %q", got)
	}
	if got := cfg.Section("TLS").Key("tls_cert_file").String(); got != "custom/path.crt" {
		t.Errorf("existing value clobbered: tls_cert_file = %q", got)
	}
	if got := cfg.Section("TLS").Key("smtp_tls_cert").String(); got != "custom" {
		t.Errorf("smtp_tls_cert not backfilled: got %q, want default %q", got, "custom")
	}
	if !cfg.Section("LetsEncryptHTTP").HasKey("enabled") {
		t.Error("[LetsEncryptHTTP] section was not backfilled")
	}

	// The backfill must be persisted to disk, not just held in memory.
	raw, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(raw), "smtp_tls_cert") {
		t.Error("backfilled key was not saved back to settings.ini")
	}
}

func TestAbsoluteSQLitePath(t *testing.T) {
	cases := []struct{ url, root, want string }{
		{"sqlite:///server_data/db.sqlite", "/app", "/app/server_data/db.sqlite"},
		{"sqlite:////abs/db.sqlite", "/app", "/abs/db.sqlite"},
		{"mysql://x", "/app", "mysql://x"},
	}
	for _, c := range cases {
		if got := AbsoluteSQLitePath(c.url, c.root); got != c.want {
			t.Errorf("AbsoluteSQLitePath(%q, %q) = %q, want %q", c.url, c.root, got, c.want)
		}
	}
}