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package config

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

func TestDefault(t *testing.T) {
	c := Default()
	if c.SlotMinutes != 30 || c.GridStart != "07:00" || c.GridEnd != "21:00" || c.Project != "" {
		t.Fatalf("bad defaults: %+v", c)
	}
}

func TestLoadFromMissingFileReturnsDefaults(t *testing.T) {
	c := LoadFrom(filepath.Join(t.TempDir(), "nope.json"))
	if !reflect.DeepEqual(c, Default()) {
		t.Fatalf("missing file should give defaults, got %+v", c)
	}
}

func TestLoadFromMergesAndClampsSlot(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "config.json")
	if err := os.WriteFile(p, []byte(`{"slot_minutes":2,"grid_start":"06:00","project":"ARCHER"}`), 0o644); err != nil {
		t.Fatal(err)
	}
	c := LoadFrom(p)
	if c.SlotMinutes != 5 { // clamped up from 2
		t.Errorf("slot=%d, want 5", c.SlotMinutes)
	}
	if c.GridStart != "06:00" {
		t.Errorf("grid_start=%q, want 06:00", c.GridStart)
	}
	if c.GridEnd != "21:00" { // untouched key keeps default
		t.Errorf("grid_end=%q, want 21:00", c.GridEnd)
	}
	if c.Project != "ARCHER" {
		t.Errorf("project=%q, want ARCHER", c.Project)
	}
}

func TestTrackingDefaults(t *testing.T) {
	c := Default()
	if c.Tracking.PollSecs != 5 || c.Tracking.IdleGraceSecs != 900 || c.Tracking.MinSecs != 15 {
		t.Fatalf("bad tracking defaults: %+v", c.Tracking)
	}
}

func TestLoadFromMergesTracking(t *testing.T) {
	p := filepath.Join(t.TempDir(), "config.json")
	if err := os.WriteFile(p, []byte(`{"tracking":{"poll_secs":10,"min_secs":30}}`), 0o644); err != nil {
		t.Fatal(err)
	}
	c := LoadFrom(p)
	if c.Tracking.PollSecs != 10 {
		t.Errorf("poll_secs=%d, want 10", c.Tracking.PollSecs)
	}
	if c.Tracking.IdleGraceSecs != 900 { // absent key keeps default
		t.Errorf("idle_grace_secs=%d, want 900", c.Tracking.IdleGraceSecs)
	}
	if c.Tracking.MinSecs != 30 {
		t.Errorf("min_secs=%d, want 30", c.Tracking.MinSecs)
	}
}

func TestLoadFromMalformedTrackingFallsBack(t *testing.T) {
	p := filepath.Join(t.TempDir(), "config.json")
	if err := os.WriteFile(p, []byte(`{"tracking":"nope"}`), 0o644); err != nil {
		t.Fatal(err)
	}
	c := LoadFrom(p)
	if c.Tracking != Default().Tracking {
		t.Errorf("malformed tracking should keep defaults, got %+v", c.Tracking)
	}
}

func TestLoadFromMergesCalendars(t *testing.T) {
	p := filepath.Join(t.TempDir(), "config.json")
	if err := os.WriteFile(p, []byte(`{"calendars":{"show":["Work","Focus"],"hide":["Holidays"]}}`), 0o644); err != nil {
		t.Fatal(err)
	}
	c := LoadFrom(p)
	if !reflect.DeepEqual(c.Calendars.Show, []string{"Work", "Focus"}) {
		t.Errorf("show=%v, want [Work Focus]", c.Calendars.Show)
	}
	if !reflect.DeepEqual(c.Calendars.Hide, []string{"Holidays"}) {
		t.Errorf("hide=%v, want [Holidays]", c.Calendars.Hide)
	}
}

func TestCalendarsDefaultEmpty(t *testing.T) {
	c := Default()
	if len(c.Calendars.Show) != 0 || len(c.Calendars.Hide) != 0 {
		t.Errorf("default calendars should be empty (all pass), got %+v", c.Calendars)
	}
}

func TestLoadFromMalformedCalendarsFallsBack(t *testing.T) {
	p := filepath.Join(t.TempDir(), "config.json")
	if err := os.WriteFile(p, []byte(`{"calendars":"nope"}`), 0o644); err != nil {
		t.Fatal(err)
	}
	c := LoadFrom(p)
	if !reflect.DeepEqual(c.Calendars, Default().Calendars) {
		t.Errorf("malformed calendars should keep defaults, got %+v", c.Calendars)
	}
}