package platform

import (
	"fmt"
	"testing"
)

func TestInferLiveBootKind(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name       string
		fsType     string
		source     string
		deviceType string
		transport  string
		want       string
	}{
		{name: "ram tmpfs", fsType: "tmpfs", source: "/dev/shm/bee-live", want: "ram"},
		{name: "usb disk", source: "/dev/sdb1", deviceType: "disk", transport: "usb", want: "usb"},
		{name: "cdrom rom", source: "/dev/sr0", deviceType: "rom", want: "cdrom"},
		{name: "disk sata", source: "/dev/nvme0n1p1", deviceType: "disk", transport: "nvme", want: "disk"},
		{name: "unknown", source: "overlay", want: "unknown"},
	}
	for _, tc := range tests {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			got := inferLiveBootKind(tc.fsType, tc.source, tc.deviceType, tc.transport)
			if got != tc.want {
				t.Fatalf("inferLiveBootKind(%q,%q,%q,%q)=%q want %q", tc.fsType, tc.source, tc.deviceType, tc.transport, got, tc.want)
			}
		})
	}
}

func TestVerifyInstallToRAMStatus(t *testing.T) {
	t.Parallel()

	dstDir := t.TempDir()

	if err := verifyInstallToRAMStatus(LiveBootSource{InRAM: true, Kind: "ram", Source: "tmpfs"}, dstDir, false, nil); err != nil {
		t.Fatalf("expected success for RAM-backed status, got %v", err)
	}

	err := verifyInstallToRAMStatus(LiveBootSource{InRAM: false, Kind: "usb", Device: "/dev/sdb1"}, dstDir, false, nil)
	if err == nil {
		t.Fatal("expected verification failure when media is still on USB")
	}
	if got := err.Error(); got != "install to RAM verification failed: live medium still mounted from USB (/dev/sdb1) and no squashfs found in "+dstDir {
		t.Fatalf("error=%q", got)
	}
}

func TestDescribeLiveBootSource(t *testing.T) {
	t.Parallel()

	if got := describeLiveBootSource(LiveBootSource{InRAM: true, Kind: "ram"}); got != "RAM" {
		t.Fatalf("got %q want RAM", got)
	}
	if got := describeLiveBootSource(LiveBootSource{Kind: "unknown", Source: "/run/live/medium"}); got != "/run/live/medium" {
		t.Fatalf("got %q want /run/live/medium", got)
	}
}

func TestEvaluateLiveMediaRAMState(t *testing.T) {
	t.Parallel()

	t.Run("in_ram", func(t *testing.T) {
		state := evaluateLiveMediaRAMState(
			LiveBootSource{InRAM: true, Kind: "ram", Source: "tmpfs"},
			false,
			nil,
			nil,
		)
		if state.State != "in_ram" || state.Status != "ok" || state.CanStartCopy {
			t.Fatalf("state=%+v", state)
		}
	})

	t.Run("partial_copy_after_cancel", func(t *testing.T) {
		state := evaluateLiveMediaRAMState(
			LiveBootSource{InRAM: false, Kind: "usb", Device: "/dev/sdb1"},
			false,
			[]string{"/run/live/medium/live/filesystem.squashfs", "/run/live/medium/live/firmware.squashfs"},
			[]string{"/dev/shm/bee-live/filesystem.squashfs"},
		)
		if state.State != "partial" || state.Status != "partial" || !state.CanStartCopy {
			t.Fatalf("state=%+v", state)
		}
		if state.CopyComplete {
			t.Fatalf("CopyComplete=%v want false", state.CopyComplete)
		}
	})

	t.Run("toram_failed", func(t *testing.T) {
		state := evaluateLiveMediaRAMState(
			LiveBootSource{InRAM: false, Kind: "usb", Device: "/dev/sdb1"},
			true,
			nil,
			nil,
		)
		if state.State != "toram_failed" || state.Status != "failed" || !state.CanStartCopy {
			t.Fatalf("state=%+v", state)
		}
	})
}

func TestShouldLogCopyProgress(t *testing.T) {
	t.Parallel()

	total := int64(250 * 1024 * 1024)
	step := int64(100 * 1024 * 1024)

	if shouldLogCopyProgress(step-1, total, 0) {
		t.Fatal("progress logged too early")
	}
	if !shouldLogCopyProgress(step, total, 0) {
		t.Fatal("expected log at first 100MB boundary")
	}
	if shouldLogCopyProgress(step+16*1024*1024, total, step) {
		t.Fatal("progress logged again before next 100MB")
	}
	if !shouldLogCopyProgress(2*step, total, step) {
		t.Fatal("expected log at second 100MB boundary")
	}
	if !shouldLogCopyProgress(total, total, 2*step) {
		t.Fatal("expected final completion log")
	}
}

func TestTryRemountLiveMedium(t *testing.T) {
	t.Parallel()

	orig := runRemountMedium
	t.Cleanup(func() {
		runRemountMedium = orig
	})

	t.Run("success", func(t *testing.T) {
		runRemountMedium = func() ([]byte, error) {
			return []byte("[10:57:31] Mounted /dev/sr1 on /run/live/medium\n"), nil
		}
		var logs []string
		if err := tryRemountLiveMedium(func(msg string) { logs = append(logs, msg) }); err != nil {
			t.Fatalf("tryRemountLiveMedium() error = %v", err)
		}
		if len(logs) != 1 || logs[0] != "bee-remount-medium: [10:57:31] Mounted /dev/sr1 on /run/live/medium" {
			t.Fatalf("logs=%v", logs)
		}
	})

	t.Run("failure", func(t *testing.T) {
		runRemountMedium = func() ([]byte, error) {
			return []byte("must be run as root\n"), fmt.Errorf("exit status 1")
		}
		var logs []string
		err := tryRemountLiveMedium(func(msg string) { logs = append(logs, msg) })
		if err == nil {
			t.Fatal("expected error")
		}
		if len(logs) != 1 || logs[0] != "bee-remount-medium: must be run as root" {
			t.Fatalf("logs=%v", logs)
		}
	})
}

func TestEnsureLiveMediumAvailableRemountsSource(t *testing.T) {
	t.Parallel()

	origGlob := liveMediumSquashfsGlob
	origRemount := runRemountMedium
	t.Cleanup(func() {
		liveMediumSquashfsGlob = origGlob
		runRemountMedium = origRemount
	})

	callCount := 0
	liveMediumSquashfsGlob = func() ([]string, error) {
		callCount++
		if callCount == 1 {
			return nil, nil
		}
		return []string{"/run/live/medium/live/filesystem.squashfs"}, nil
	}
	runRemountMedium = func() ([]byte, error) {
		return []byte("Mounted /dev/sr1 on /run/live/medium\n"), nil
	}

	var logs []string
	files, ok := ensureLiveMediumAvailable(func(msg string) { logs = append(logs, msg) })
	if !ok {
		t.Fatal("expected live medium to become available after remount")
	}
	if callCount < 2 {
		t.Fatalf("liveMediumSquashfsGlob called %d times, want at least 2", callCount)
	}
	if len(files) != 1 || files[0] != "/run/live/medium/live/filesystem.squashfs" {
		t.Fatalf("files=%v", files)
	}
	found := false
	for _, msg := range logs {
		if msg == "Live medium restored after remount scan." {
			found = true
			break
		}
	}
	if !found {
		t.Fatalf("expected remount success log, logs=%v", logs)
	}
}

func TestDetachInstallMedium(t *testing.T) {
	t.Parallel()

	origUmount := umountLiveMedium
	origEject := ejectDevice
	t.Cleanup(func() {
		umountLiveMedium = origUmount
		ejectDevice = origEject
	})

	t.Run("success", func(t *testing.T) {
		var umountCalled bool
		var ejected string
		umountLiveMedium = func() error {
			umountCalled = true
			return nil
		}
		ejectDevice = func(device string) error {
			ejected = device
			return nil
		}
		var logs []string
		detachInstallMedium(LiveBootSource{Kind: "cdrom", Device: "/dev/sr1"}, func(msg string) { logs = append(logs, msg) })
		if !umountCalled {
			t.Fatal("expected umountLiveMedium to be called")
		}
		if ejected != "/dev/sr1" {
			t.Fatalf("ejected=%q want /dev/sr1", ejected)
		}
		if len(logs) < 3 {
			t.Fatalf("logs=%v", logs)
		}
	})

	t.Run("no device", func(t *testing.T) {
		umountLiveMedium = func() error { return nil }
		ejectDevice = func(device string) error {
			t.Fatalf("unexpected eject for %q", device)
			return nil
		}
		var logs []string
		detachInstallMedium(LiveBootSource{Kind: "ram", Source: "tmpfs"}, func(msg string) { logs = append(logs, msg) })
		found := false
		for _, msg := range logs {
			if msg == "No block device identified for eject; skipping media eject." {
				found = true
				break
			}
		}
		if !found {
			t.Fatalf("logs=%v", logs)
		}
	})

	t.Run("eject failure is warning only", func(t *testing.T) {
		umountLiveMedium = func() error { return nil }
		ejectDevice = func(device string) error { return fmt.Errorf("exit status 1") }
		var logs []string
		detachInstallMedium(LiveBootSource{Kind: "usb", Device: "/dev/sdb1"}, func(msg string) { logs = append(logs, msg) })
		found := false
		for _, msg := range logs {
			if msg == "Warning: could not eject /dev/sdb1: exit status 1" {
				found = true
				break
			}
		}
		if !found {
			t.Fatalf("logs=%v", logs)
		}
	})
}