package skills

import (
	"context"
	"errors"
	"strings"
	"sync"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/capability/registry"
	"git.yeij.top/AskaEth/Cyrene_v2/pkg/plugins/sdk"
)

func TestRunner_Expand_正常(t *testing.T) {
	t.Parallel()
	r := NewRunner(registry.New(), testLogger())
	wf, err := r.Expand(context.Background(), makeSkill(t, "review"))
	if err != nil {
		t.Fatalf("Expand: %v", err)
	}
	if wf.Name != "review" {
		t.Fatalf("Name = %q, want review", wf.Name)
	}
	if wf.Description != "desc review" {
		t.Fatalf("Description = %q, want desc review", wf.Description)
	}
	if wf.Prompt != "prompt review" {
		t.Fatalf("Prompt = %q, want prompt review", wf.Prompt)
	}
	if len(wf.Steps) != 1 || wf.Steps[0].Name != "s1" {
		t.Fatalf("Steps = %+v, want one step s1", wf.Steps)
	}
	if len(wf.Refs) != 1 || wf.Refs[0].Name != "r1" {
		t.Fatalf("Refs = %+v, want one ref r1", wf.Refs)
	}
	if len(wf.Guardrails) != 1 || wf.Guardrails[0].ID != "g1" {
		t.Fatalf("Guardrails = %+v, want one guardrail g1", wf.Guardrails)
	}
	if wf.Spec.Version != sdk.DefaultSkillVersion || wf.Spec.Invocation != sdk.InvocationBoth || wf.Spec.Context != sdk.ContextInline {
		t.Fatalf("Spec 缺省值 = %+v, want version=1/invocation=both/context=inline", wf.Spec)
	}
}

func TestRunner_Expand_Nil_异常(t *testing.T) {
	t.Parallel()
	r := NewRunner(registry.New(), testLogger())
	if _, err := r.Expand(context.Background(), nil); !errors.Is(err, ErrInvalidSkill) {
		t.Fatalf("Expand(nil) err = %v, want ErrInvalidSkill", err)
	}
}

func TestRunner_Expand_BlankName_异常(t *testing.T) {
	t.Parallel()
	r := NewRunner(registry.New(), testLogger())
	if _, err := r.Expand(context.Background(), mockSkill{name: "   "}); !errors.Is(err, ErrInvalidSkill) {
		t.Fatalf("Expand(blank) err = %v, want ErrInvalidSkill", err)
	}
}

func TestRunner_Expand_ContextCanceled_异常(t *testing.T) {
	t.Parallel()
	r := NewRunner(registry.New(), testLogger())
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	if _, err := r.Expand(ctx, makeSkill(t, "review")); !errors.Is(err, context.Canceled) {
		t.Fatalf("Expand(canceled) err = %v, want context.Canceled", err)
	}
}

func TestRunner_ExpandByName_正常(t *testing.T) {
	t.Parallel()
	reg := registry.New()
	if err := Register(reg, makeSkill(t, "review")); err != nil {
		t.Fatalf("Register: %v", err)
	}
	r := NewRunner(reg, testLogger())
	wf, err := r.ExpandByName(context.Background(), "review")
	if err != nil {
		t.Fatalf("ExpandByName: %v", err)
	}
	if wf.Name != "review" || len(wf.Steps) != 1 {
		t.Fatalf("Workflow = %+v, want review with one step", wf)
	}
}

func TestRunner_ExpandByName_NotSkill_异常(t *testing.T) {
	t.Parallel()
	reg := registry.New()
	// 注册一个 Value 不是 Skill 的能力（直接用裸 API）。
	if err := reg.Register(registry.Capability{Name: "notaskill", Kind: registry.KindTool, Value: "x"}); err != nil {
		t.Fatalf("register tool-cap: %v", err)
	}
	r := NewRunner(reg, testLogger())
	if _, err := r.ExpandByName(context.Background(), "notaskill"); !errors.Is(err, ErrNotFound) {
		t.Fatalf("ExpandByName(non-skill) err = %v, want ErrNotFound", err)
	}
}

func TestRunner_ExpandByName_NotFound_异常(t *testing.T) {
	t.Parallel()
	r := NewRunner(registry.New(), testLogger())
	if _, err := r.ExpandByName(context.Background(), "missing"); !errors.Is(err, registry.ErrNotFound) {
		t.Fatalf("ExpandByName(missing) err = %v, want registry.ErrNotFound", err)
	}
}

func TestRunner_ExpandByName_NilRegistrar_异常(t *testing.T) {
	t.Parallel()
	r := NewRunner(nil, testLogger())
	if _, err := r.ExpandByName(context.Background(), "x"); !errors.Is(err, ErrNilRegistrar) {
		t.Fatalf("ExpandByName(nil reg) err = %v, want ErrNilRegistrar", err)
	}
}

// ---- Run / RunSkill：真执行 ----

// TestRunner_RunSkill_线性依赖按序执行 覆盖最基本的执行路径：一步依赖另一步，
// 前序输出按步骤名传给下游，结果按声明序汇报。
func TestRunner_RunSkill_线性依赖按序执行(t *testing.T) {
	t.Parallel()
	skill := mustSkill(t, "brief",
		[]sdk.Step{
			{Name: "collect", Prompt: "收集"},
			{Name: "summarize", Prompt: "汇总", Depends: []string{"collect"}},
		},
		WithSpec(Spec{AllowedTools: []string{"search", "note"}}))
	exec := &recordingExecutor{outputs: map[string]string{"collect": "原料", "summarize": "结论"}}
	res, err := NewRunner(registry.New(), testLogger()).RunSkill(context.Background(), skill, RunOptions{
		Executor:  exec,
		Gate:      NewNameSet([]string{"search", "note", "write"}),
		ToolNames: []string{"search", "note", "write"},
	})
	if err != nil {
		t.Fatalf("RunSkill: %v", err)
	}
	if got := strings.Join(exec.order(), ","); got != "collect,summarize" {
		t.Fatalf("执行顺序 = %q, want collect,summarize", got)
	}
	if got := exec.depsOf("summarize")["collect"]; got != "原料" {
		t.Fatalf("summarize 拿到的 collect 输出 = %q, want 原料", got)
	}
	if got := strings.Join(res.Tools, ","); got != "search,note" {
		t.Fatalf("Tools = %q, want search,note（write 被 allowed-tools 收掉）", got)
	}
	if len(res.Steps) != 2 || res.Steps[0].Name != "collect" || res.Steps[1].Output != "结论" {
		t.Fatalf("Steps = %+v, want collect/summarize 两条", res.Steps)
	}
}

// TestRunner_RunSkill_每步工具面一致且已收缩 断言 executor 看到的 Tools 就是
// 收缩后的结果（执行侧不可能拿到更宽的面）。
func TestRunner_RunSkill_每步工具面一致且已收缩(t *testing.T) {
	t.Parallel()
	skill := mustSkill(t, "s", []sdk.Step{{Name: "one", Prompt: "p"}},
		WithSpec(Spec{AllowedTools: []string{"a"}, DisallowedTools: []string{"a2"}}))
	exec := &recordingExecutor{}
	_, err := NewRunner(registry.New(), testLogger()).RunSkill(context.Background(), skill, RunOptions{
		Executor:  exec,
		Gate:      NewNameSet([]string{"a", "b"}),
		ToolNames: []string{"a", "a2", "b"},
	})
	if err != nil {
		t.Fatalf("RunSkill: %v", err)
	}
	if got := strings.Join(exec.toolsOf("one"), ","); got != "a" {
		t.Fatalf("步骤工具面 = %q, want a", got)
	}
}

func TestRunner_RunSkill_校验失败_异常(t *testing.T) {
	t.Parallel()
	// 依赖成环 ⇒ 执行前就被 Validate 拦下（运行期绝不挂死）。
	skill := mustSkill(t, "cycle", []sdk.Step{
		{Name: "a", Prompt: "p", Depends: []string{"b"}},
		{Name: "b", Prompt: "p", Depends: []string{"a"}},
	})
	_, err := NewRunner(registry.New(), testLogger()).RunSkill(context.Background(), skill, RunOptions{
		Executor: &recordingExecutor{}, Gate: NewNameSet(nil), ToolNames: []string{"x"},
	})
	if !errors.Is(err, ErrStepCycle) {
		t.Fatalf("RunSkill(cycle) err = %v, want ErrStepCycle", err)
	}
}

func TestRunner_RunSkill_缺执行器_异常(t *testing.T) {
	t.Parallel()
	_, err := NewRunner(registry.New(), testLogger()).RunSkill(context.Background(), makeSkill(t, "s"), RunOptions{
		Gate: NewNameSet(nil),
	})
	if !errors.Is(err, ErrNoExecutor) {
		t.Fatalf("RunSkill 无 executor err = %v, want ErrNoExecutor", err)
	}
}

func TestRunner_RunSkill_缺安全闸_异常(t *testing.T) {
	t.Parallel()
	_, err := NewRunner(registry.New(), testLogger()).RunSkill(context.Background(), makeSkill(t, "s"), RunOptions{
		Executor: &recordingExecutor{},
	})
	if !errors.Is(err, ErrNilGate) {
		t.Fatalf("RunSkill 无 gate err = %v, want ErrNilGate", err)
	}
}

func TestRunner_RunSkill_Nil_异常(t *testing.T) {
	t.Parallel()
	_, err := NewRunner(registry.New(), testLogger()).RunSkill(context.Background(), nil, RunOptions{
		Executor: &recordingExecutor{}, Gate: NewNameSet(nil),
	})
	if !errors.Is(err, ErrInvalidSkill) {
		t.Fatalf("RunSkill(nil) err = %v, want ErrInvalidSkill", err)
	}
}

// TestRunner_Run_按注册表找技能 覆盖 Run 的按名查找路径（含找不到的两种情形）。
func TestRunner_Run_按注册表找技能(t *testing.T) {
	t.Parallel()
	reg := registry.New()
	skill := mustSkill(t, "brief", []sdk.Step{{Name: "one", Prompt: "p"}})
	if err := Register(reg, skill); err != nil {
		t.Fatalf("Register: %v", err)
	}
	r := NewRunner(reg, testLogger())
	res, err := r.Run(context.Background(), "brief", RunOptions{
		Executor: &recordingExecutor{}, Gate: NewNameSet([]string{"t"}), ToolNames: []string{"t"},
	})
	if err != nil {
		t.Fatalf("Run: %v", err)
	}
	if res.Skill != "brief" || len(res.Steps) != 1 {
		t.Fatalf("RunResult = %+v, want brief with one step", res)
	}

	if _, err := r.Run(context.Background(), "missing", RunOptions{
		Executor: &recordingExecutor{}, Gate: NewNameSet([]string{"t"}), ToolNames: []string{"t"},
	}); !errors.Is(err, registry.ErrNotFound) {
		t.Fatalf("Run(missing) err = %v, want registry.ErrNotFound", err)
	}
	if _, err := NewRunner(nil, testLogger()).Run(context.Background(), "brief", RunOptions{
		Executor: &recordingExecutor{}, Gate: NewNameSet([]string{"t"}),
	}); !errors.Is(err, ErrNilRegistrar) {
		t.Fatalf("Run(nil reg) err = %v, want ErrNilRegistrar", err)
	}
}

// TestRunner_RunSkill_工具面取自注册表 断言 ToolNames 缺省时从注册表 KindTool 读，
// 且技能声明的工具名必须真实存在于注册表 —— 不存在的名字不会凭空出现。
func TestRunner_RunSkill_工具面取自注册表(t *testing.T) {
	t.Parallel()
	reg := registry.New()
	for _, name := range []string{"alpha", "beta"} {
		sdkTool := stubTool{name: name}
		if err := reg.RegisterTool(sdkTool); err != nil {
			t.Fatalf("RegisterTool(%s): %v", name, err)
		}
	}
	skill := mustSkill(t, "s", []sdk.Step{{Name: "one", Prompt: "p"}},
		WithSpec(Spec{AllowedTools: []string{"alpha", "ghost"}}))
	exec := &recordingExecutor{}
	res, err := NewRunner(reg, testLogger()).RunSkill(context.Background(), skill, RunOptions{
		Executor: exec, Gate: NewNameSet([]string{"alpha", "beta"}),
	})
	if err != nil {
		t.Fatalf("RunSkill: %v", err)
	}
	if got := strings.Join(res.Tools, ","); got != "alpha" {
		t.Fatalf("Tools = %q, want alpha（beta 被技能收掉，ghost 不在注册表里）", got)
	}
}

// stubTool 是注册表测试用的最小 sdk.Tool。
type stubTool struct{ name string }

func (s stubTool) Name() string                                  { return s.name }
func (s stubTool) Description() string                           { return "stub " + s.name }
func (s stubTool) Parameters() (map[string]any, error)           { return map[string]any{"type": "object"}, nil }
func (s stubTool) Execute(_ context.Context, _ any) (any, error) { return nil, nil }

// mustSkill 构造一个技能，失败即 fatal。
func mustSkill(t *testing.T, name string, steps []sdk.Step, opts ...Option) *Skill {
	t.Helper()
	skill, err := New(name, "desc "+name, "base prompt", steps, nil, nil, opts...)
	if err != nil {
		t.Fatalf("New(%s): %v", name, err)
	}
	return skill
}

// recordingExecutor 记录每一步的执行顺序与入参，并可按步骤名定制输出/错误。
type recordingExecutor struct {
	mu      sync.Mutex
	steps   []string
	deps    map[string]map[string]string
	tools   map[string][]string
	outputs map[string]string
	errs    map[string]error
}

func (e *recordingExecutor) ExecuteStep(_ context.Context, req StepRequest) (StepResult, error) {
	e.mu.Lock()
	defer e.mu.Unlock()
	if e.deps == nil {
		e.deps = make(map[string]map[string]string)
	}
	if e.tools == nil {
		e.tools = make(map[string][]string)
	}
	e.steps = append(e.steps, req.Step.Name)
	e.deps[req.Step.Name] = req.Depends
	e.tools[req.Step.Name] = append([]string(nil), req.Tools...)
	if err := e.errs[req.Step.Name]; err != nil {
		return StepResult{}, err
	}
	return StepResult{Output: e.outputs[req.Step.Name]}, nil
}

func (e *recordingExecutor) order() []string {
	e.mu.Lock()
	defer e.mu.Unlock()
	return append([]string(nil), e.steps...)
}

func (e *recordingExecutor) depsOf(step string) map[string]string {
	e.mu.Lock()
	defer e.mu.Unlock()
	return e.deps[step]
}

func (e *recordingExecutor) toolsOf(step string) []string {
	e.mu.Lock()
	defer e.mu.Unlock()
	return append([]string(nil), e.tools[step]...)
}