//go:build linux

package application

import (
	"testing"

	"gorm.io/gorm"
	"rhemawavetech.com/rhemawave/internal/db"
	"rhemawavetech.com/rhemawave/internal/page"
)

// Regression: The app used to reach READY before audio downloads completed,
// showing "Status: READY" while "0 / 14 Files Downloaded" was still in progress.
// The fix gates READY on downloadsComplete being true.

// TestStateTransitionsToDownloadingAssets verifies that when all config
// prerequisites are met but downloads are not complete, the state transitions
// to DOWNLOADING_ASSETS instead of READY.
func TestStateTransitionsToDownloadingAssets(t *testing.T) {
	// Set up minimal application state
	app := &Application{
		state:    FIRST_RUN,
		DB:       setupTestDB(t),
		running:  true,
	}

	// Simulate: network is up, email and license are set
	networkIsUp = true
	config, err := db.GetConfig(app.DB)
	if err != nil {
		t.Fatal(err)
	}
	config.EmailAddress = "test@example.com"
	config.LicenseKey = "test-key-123"
	app.DB.Save(config)

	// Downloads are NOT complete
	app.downloadsComplete = false

	// Create a minimal router with channels
	downloadDone := make(chan struct{})
	app.PageRouter = &page.Router{
		Context: page.PageCtx{
			DbPtr:        app.DB,
			DownloadDone: downloadDone,
		},
	}

	// Run checkState
	app.checkState()

	// Should be in DOWNLOADING_ASSETS, not READY
	if app.state != DOWNLOADING_ASSETS {
		t.Errorf("state = %v, want DOWNLOADING_ASSETS (downloads not complete)", app.state)
	}
}

// TestStateTransitionsToReadyWhenDownloadsComplete verifies that the state
// transitions to READY only after downloads are complete.
func TestStateTransitionsToReadyWhenDownloadsComplete(t *testing.T) {
	app := &Application{
		state:    FIRST_RUN,
		DB:       setupTestDB(t),
		running:  true,
	}

	networkIsUp = true
	config, err := db.GetConfig(app.DB)
	if err != nil {
		t.Fatal(err)
	}
	config.EmailAddress = "test@example.com"
	config.LicenseKey = "test-key-123"
	app.DB.Save(config)

	// Downloads ARE complete
	app.downloadsComplete = true

	downloadDone := make(chan struct{})
	app.PageRouter = &page.Router{
		Context: page.PageCtx{
			DbPtr:        app.DB,
			DownloadDone: downloadDone,
		},
	}

	app.checkState()

	if app.state != READY {
		t.Errorf("state = %v, want READY", app.state)
	}
}

// Regression: Download failure should prevent the app from reaching READY.
// If downloads fail, the user sees an error and must restart to retry.
func TestDownloadFailurePreventsReady(t *testing.T) {
	app := &Application{
		state:    FIRST_RUN,
		DB:       setupTestDB(t),
		running:  true,
	}

	networkIsUp = true
	config, err := db.GetConfig(app.DB)
	if err != nil {
		t.Fatal(err)
	}
	config.EmailAddress = "test@example.com"
	config.LicenseKey = "test-key-123"
	app.DB.Save(config)

	// Downloads completed but failed
	app.downloadsComplete = false
	app.downloadFailed = true

	downloadDone := make(chan struct{})
	app.PageRouter = &page.Router{
		Context: page.PageCtx{
			DbPtr:        app.DB,
			DownloadDone: downloadDone,
		},
	}

	app.checkState()

	// Should NOT be READY — download failed
	if app.state == READY {
		t.Error("state should not be READY when download has failed")
	}
}

// TestStateStaysReadyOnceSet verifies that once the state reaches READY,
// checkState() is a no-op (doesn't reset or re-navigate).
func TestStateStaysReadyOnceSet(t *testing.T) {
	app := &Application{
		state:    READY,
		DB:       setupTestDB(t),
		running:  true,
	}

	downloadDone := make(chan struct{})
	app.PageRouter = &page.Router{
		Context: page.PageCtx{
			DbPtr:        app.DB,
			DownloadDone: downloadDone,
		},
	}

	app.checkState()

	if app.state != READY {
		t.Errorf("state = %v, want READY (should not change once set)", app.state)
	}
}

// setupTestDB creates a temporary in-memory SQLite database for testing.
func setupTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	d, err := db.Connect(":memory:")
	if err != nil {
		t.Fatal(err)
	}
	if err := db.Migrate(d); err != nil {
		t.Fatal(err)
	}
	// Create default config
	cfg := &db.AppConfig{
		Model:               gorm.Model{ID: 1},
		DataDir:             t.TempDir(),
		AssetsDir:           t.TempDir(),
		SystemLevel:         "BASIC",
		SelectedAudioDevice: "default",
		InitialFontSize:     128,
		StandardFontSize:    32,
		LinePattern:         "fibonacci",
		AudioEnabled:        true,
		SavedVolume:         1.0,
		EmailAddress:        "",
		LicenseKey:          "",
	}
	if err := d.Create(cfg).Error; err != nil {
		t.Fatal(err)
	}
	return d
}