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package config

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

func TestDefaultHasSaneValues(t *testing.T) {
	d := Default()
	if d.DailySubdir != "Daily" {
		t.Errorf("DailySubdir = %q, want Daily", d.DailySubdir)
	}
	if d.DailyFormat != "2006-01-02" {
		t.Errorf("DailyFormat = %q, want 2006-01-02", d.DailyFormat)
	}
	if d.GlamourStyle != "" {
		t.Errorf("GlamourStyle default = %q, want empty (theme drives it)", d.GlamourStyle)
	}
	if d.Theme != "auto" {
		t.Errorf("Theme = %q, want auto", d.Theme)
	}
	if d.VaultDir == "" {
		t.Error("VaultDir should not be empty")
	}
}

func TestLoadFromFileMissingReturnsDefaults(t *testing.T) {
	cfg, err := loadFromFile(filepath.Join(t.TempDir(), "nope.toml"))
	if err != nil {
		t.Fatalf("missing file should not error, got %v", err)
	}
	if cfg.DailyFormat != "2006-01-02" {
		t.Errorf("DailyFormat = %q, want default", cfg.DailyFormat)
	}
}

func TestLoadFromFileOverlays(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	body := `vault_dir = "/tmp/vault"
daily_subdir = "journal"
daily_format = "20060102"
`
	if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := loadFromFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.VaultDir != "/tmp/vault" {
		t.Errorf("VaultDir = %q", cfg.VaultDir)
	}
	if cfg.DailySubdir != "journal" {
		t.Errorf("DailySubdir = %q", cfg.DailySubdir)
	}
	if cfg.DailyFormat != "20060102" {
		t.Errorf("DailyFormat = %q", cfg.DailyFormat)
	}
	// unset key keeps default
	if cfg.GlamourStyle != "" {
		t.Errorf("GlamourStyle = %q, want default empty", cfg.GlamourStyle)
	}
}

func TestLoadFromFileOverlaysTheme(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	if err := os.WriteFile(path, []byte("theme = \"charm\"\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := loadFromFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Theme != "charm" {
		t.Errorf("Theme = %q, want charm", cfg.Theme)
	}
}

func TestLoadFromFileMalformedErrors(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "bad.toml")
	if err := os.WriteFile(path, []byte("vault_dir = = ="), 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := loadFromFile(path); err == nil {
		t.Error("malformed config should return an error")
	}
}

func TestDailyPath(t *testing.T) {
	c := Config{VaultDir: "/v", DailySubdir: "Daily", DailyFormat: "2006-01-02"}
	got := c.DailyPath(time.Date(2026, 6, 27, 0, 0, 0, 0, time.UTC))
	want := filepath.Join("/v", "Daily", "2026-06-27.md")
	if got != want {
		t.Errorf("DailyPath = %q, want %q", got, want)
	}
}

func TestInboxDirDefaultsEmptyAndOverlays(t *testing.T) {
	if d := Default(); d.InboxDir != "" {
		t.Errorf("InboxDir default = %q, want empty (vault root)", d.InboxDir)
	}
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	if err := os.WriteFile(path, []byte("inbox_dir = \"Inbox\"\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := loadFromFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.InboxDir != "Inbox" {
		t.Errorf("InboxDir = %q, want Inbox", cfg.InboxDir)
	}
}

func TestInboxRootResolves(t *testing.T) {
	c := Config{VaultDir: "/v"}
	if got := c.InboxRoot(); got != "/v" {
		t.Errorf("empty InboxDir → %q, want /v (vault root)", got)
	}
	c.InboxDir = "Inbox"
	if got := c.InboxRoot(); got != filepath.Join("/v", "Inbox") {
		t.Errorf("relative InboxDir → %q, want /v/Inbox", got)
	}
	c.InboxDir = "/abs/inbox"
	if got := c.InboxRoot(); got != "/abs/inbox" {
		t.Errorf("absolute InboxDir → %q, want /abs/inbox", got)
	}
}

func TestDefaultVaultUsesEnvThenCwd(t *testing.T) {
	t.Setenv("GLINT_VAULT", "/explicit/vault")
	if d := Default(); d.VaultDir != "/explicit/vault" {
		t.Errorf("with GLINT_VAULT set: VaultDir = %q, want /explicit/vault", d.VaultDir)
	}
	t.Setenv("GLINT_VAULT", "")
	wd, _ := os.Getwd()
	if d := Default(); d.VaultDir != wd {
		t.Errorf("without GLINT_VAULT: VaultDir = %q, want cwd %q", d.VaultDir, wd)
	}
}