package skills

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

func TestInstallUninstallIdempotent(t *testing.T) {
	project := t.TempDir()

	if err := Install(project, "fd-engineering"); err != nil {
		t.Fatalf("install: %v", err)
	}
	// 幂等：重复安装不报错。
	if err := Install(project, "fd-engineering"); err != nil {
		t.Fatalf("reinstall: %v", err)
	}
	if !IsInstalled(project, "fd-engineering") {
		t.Fatal("expected installed after Install")
	}
	if _, err := os.Stat(filepath.Join(project, ".cursor", "skills", "fd-engineering", "SKILL.md")); err != nil {
		t.Fatalf("SKILL.md missing: %v", err)
	}
	if _, err := os.Stat(filepath.Join(project, ".cursor", "skills", "fd-engineering", "references", "execute.md")); err != nil {
		t.Fatalf("references missing: %v", err)
	}

	// 命令文件应分发到 .cursor/commands/。
	commandPath := filepath.Join(project, ".cursor", "commands", "FD-commit.md")
	if _, err := os.Stat(commandPath); err != nil {
		t.Fatalf("command file missing: %v", err)
	}
	// 命令模板不应进入 skill 目录。
	if _, err := os.Stat(filepath.Join(project, ".cursor", "skills", "fd-engineering", "commands")); !os.IsNotExist(err) {
		t.Fatal("commands template must not be copied into skill dir")
	}

	if err := Uninstall(project, "fd-engineering"); err != nil {
		t.Fatalf("uninstall: %v", err)
	}
	if _, err := os.Stat(commandPath); !os.IsNotExist(err) {
		t.Fatalf("command file should be removed: %v", err)
	}
	if IsInstalled(project, "fd-engineering") {
		t.Fatal("expected not installed after Uninstall")
	}
}

func TestInstallRefreshesBuiltinAndRetiredFiles(t *testing.T) {
	project := t.TempDir()
	if err := Install(project, "fd-engineering"); err != nil {
		t.Fatalf("install: %v", err)
	}

	target := filepath.Join(project, ".cursor", "skills", "fd-engineering")
	skillPath := filepath.Join(target, "SKILL.md")
	if err := os.WriteFile(skillPath, []byte("old skill\n"), 0o644); err != nil {
		t.Fatalf("write stale skill: %v", err)
	}
	workflowPath := filepath.Join(target, "references", "workflow.md")
	if err := os.Remove(workflowPath); err != nil {
		t.Fatalf("remove workflow: %v", err)
	}
	for _, name := range []string{"native-tools.md", "mode-switch.md"} {
		path := filepath.Join(target, "references", name)
		if err := os.WriteFile(path, []byte("retired\n"), 0o644); err != nil {
			t.Fatalf("write retired reference: %v", err)
		}
	}
	customPath := filepath.Join(target, "references", "custom.md")
	if err := os.WriteFile(customPath, []byte("user-owned\n"), 0o644); err != nil {
		t.Fatalf("write custom reference: %v", err)
	}

	if err := Install(project, "fd-engineering"); err != nil {
		t.Fatalf("refresh install: %v", err)
	}
	got, err := os.ReadFile(skillPath)
	if err != nil {
		t.Fatalf("read refreshed skill: %v", err)
	}
	want, err := builtinFS.ReadFile("builtin/fd-engineering/SKILL.md")
	if err != nil {
		t.Fatalf("read embedded skill: %v", err)
	}
	if string(got) != string(want) {
		t.Fatal("existing skill was not refreshed from builtin content")
	}
	if _, err := os.Stat(workflowPath); err != nil {
		t.Fatalf("missing workflow was not restored: %v", err)
	}
	for _, name := range []string{"native-tools.md", "mode-switch.md"} {
		if _, err := os.Stat(filepath.Join(target, "references", name)); !os.IsNotExist(err) {
			t.Fatalf("retired reference %s was not removed", name)
		}
	}
	if _, err := os.Stat(customPath); err != nil {
		t.Fatalf("user-owned reference must survive refresh: %v", err)
	}
}

func TestUninstallKeepsUserCommands(t *testing.T) {
	project := t.TempDir()
	if err := Install(project, "fd-engineering"); err != nil {
		t.Fatalf("install: %v", err)
	}
	// 用户自建命令不受影响。
	userCommand := filepath.Join(project, ".cursor", "commands", "my-own.md")
	if err := os.WriteFile(userCommand, []byte("# own\n"), 0o644); err != nil {
		t.Fatalf("write user command: %v", err)
	}
	if err := Uninstall(project, "fd-engineering"); err != nil {
		t.Fatalf("uninstall: %v", err)
	}
	if _, err := os.Stat(userCommand); err != nil {
		t.Fatalf("user command must survive: %v", err)
	}
}

func TestInstallRejectsUnknownSkillAndBadProject(t *testing.T) {
	if err := Install(t.TempDir(), "not-exist"); err == nil {
		t.Fatal("expected error for unknown skill")
	}
	if err := Install(filepath.Join(t.TempDir(), "missing"), "fd-engineering"); err == nil {
		t.Fatal("expected error for missing project dir")
	}
	// 路径穿越防护。
	if err := Install(t.TempDir(), "../evil"); err == nil {
		t.Fatal("expected error for path traversal")
	}
}

func TestListExposesCommands(t *testing.T) {
	list := List()
	if len(list) == 0 {
		t.Fatal("expected builtin skills")
	}
	var found *Skill
	for i := range list {
		if list[i].Name == "fd-engineering" {
			found = &list[i]
		}
	}
	if found == nil {
		t.Fatal("fd-engineering not listed")
	}
	if len(found.Commands) == 0 {
		t.Fatal("expected commands to be listed")
	}
	if found.Commands[0].Description == "" {
		t.Fatal("expected command description parsed from frontmatter")
	}
}