package e2e

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

// TestSyncForceOverwritesLocallyModified pins the --force escape hatch:
// locally modified managed items are overwritten with the repository
// version, upstream-deleted modified items are removed, and unmanaged
// local items are never touched.
func TestSyncForceOverwritesLocallyModified(t *testing.T) {
	h := newHarness(t)
	env := newSyncEnv(t, h)
	buildWorkRepo(t, h, env.workRepo)
	env.writeConfig(t, env.workRepo, "")
	env.run(t)

	// local drift on a managed item + upstream change to the same item
	deployed := filepath.Join(env.home, ".config/opencode/commands/deploy.md")
	os.WriteFile(deployed, []byte("---\nname: Deploy\n---\nlocal drift\n"), 0o644)
	upstream := filepath.Join(env.workRepo, "commands/deploy.md")
	os.WriteFile(upstream, []byte("---\nname: Deploy\ndescription: updated\n---\nnew body\n"), 0o644)

	// an unmanaged local item that must survive --force untouched
	unmanaged := filepath.Join(env.home, ".config/opencode/commands/mine.md")
	os.MkdirAll(filepath.Dir(unmanaged), 0o755)
	os.WriteFile(unmanaged, []byte("---\nname: Mine\n---\nprecious\n"), 0o644)

	h.git(t, env.workRepo, "add", "-A")
	h.git(t, env.workRepo, "commit", "-m", "update deploy command")

	out, err := env.run(t)
	if err != nil {
		t.Fatalf("sync failed: %v\n%s", err, out)
	}
	if !contains(out, "skipped (local modifications kept): 1") {
		t.Errorf("default sync must keep the local modification:\n%s", out)
	}

	out, err = env.run(t, "--force")
	if err != nil {
		t.Fatalf("sync --force failed: %v\n%s", err, out)
	}
	if !contains(out, "updated:  1") {
		t.Errorf("force must update the locally modified item:\n%s", out)
	}
	if got := readFile(t, deployed); !contains(got, "new body") {
		t.Error("force must overwrite the local drift with the repository version")
	}
	if got := readFile(t, unmanaged); !contains(got, "precious") {
		t.Error("force must never touch unmanaged local items")
	}

	// upstream deletion of a locally modified item: force removes it
	os.WriteFile(deployed, []byte("---\nname: Deploy\n---\nmore drift\n"), 0o644)
	os.Remove(upstream)
	h.git(t, env.workRepo, "add", "-A")
	h.git(t, env.workRepo, "commit", "-m", "delete deploy command")

	out, err = env.run(t)
	if err != nil {
		t.Fatalf("sync failed: %v\n%s", err, out)
	}
	if !contains(out, "skipped (local modifications kept): 1") {
		t.Errorf("default sync must keep the modified item after upstream deletion:\n%s", out)
	}
	if _, err := os.Stat(deployed); err != nil {
		t.Fatal("item must still exist before force")
	}

	out, err = env.run(t, "--force")
	if err != nil {
		t.Fatalf("sync --force failed: %v\n%s", err, out)
	}
	if !contains(out, "removed:  1") {
		t.Errorf("force must remove the locally modified item after upstream deletion:\n%s", out)
	}
	if _, err := os.Stat(deployed); !os.IsNotExist(err) {
		t.Error("forced removal must delete the deployed file")
	}
}