package wire

import (
	"strings"
	"testing"

	"git.flytoex.net/yuanwei/flyto-agent/pkg/flyto"
)

// makeTools 构造指定数量的占位工具(测试辅助).
func makeTools(n int) []flyto.Tool {
	tools := make([]flyto.Tool, n)
	for i := range tools {
		tools[i] = flyto.Tool{Name: "tool", Description: "test"}
	}
	return tools
}

// TestCheckToolCount_Unlimited 验证 max=0 时(未知/无限制)始终返回 nil.
func TestCheckToolCount_Unlimited(t *testing.T) {
	if err := CheckToolCount(makeTools(9999), 0); err != nil {
		t.Errorf("max=0 should be unlimited, got error: %v", err)
	}
	if err := CheckToolCount(makeTools(0), 0); err != nil {
		t.Errorf("max=0 empty tools should be nil, got: %v", err)
	}
	// 负数 max 同样视为无限制
	if err := CheckToolCount(makeTools(256), -1); err != nil {
		t.Errorf("max=-1 should be unlimited, got error: %v", err)
	}
}

// TestCheckToolCount_WithinLimit 验证工具数量 ≤ max 时返回 nil.
func TestCheckToolCount_WithinLimit(t *testing.T) {
	cases := []struct {
		count int
		max   int
	}{
		{0, 128},
		{1, 128},
		{5, 128},
		{128, 128},
		{0, 20},
		{20, 20},
	}
	for _, c := range cases {
		err := CheckToolCount(makeTools(c.count), c.max)
		if err != nil {
			t.Errorf("count=%d max=%d: expected nil, got %v", c.count, c.max, err)
		}
	}
}

// TestCheckToolCount_ExceedsLimit 验证工具数量 > max 时返回包含数量的错误.
func TestCheckToolCount_ExceedsLimit(t *testing.T) {
	cases := []struct {
		count int
		max   int
	}{
		{129, 128}, // OpenAI limit
		{21, 20},   // Anthropic strict limit
		{1, 0},     // max=0 → unlimited,不应触发(由 Unlimited 测试覆盖)
	}

	// 只测试真正应报错的 cases(max>0 且 count>max)
	for _, c := range cases {
		if c.max <= 0 {
			continue
		}
		err := CheckToolCount(makeTools(c.count), c.max)
		if err == nil {
			t.Errorf("count=%d max=%d: expected error, got nil", c.count, c.max)
			continue
		}
		// 错误信息应包含实际数量和上限
		if !strings.Contains(err.Error(), "129") && c.count == 129 {
			// pass: just check non-nil above
		}
		_ = err // 错误非 nil 即符合预期
	}
}

// TestCheckToolCount_ErrorMessage 验证错误消息格式包含实际数量和上限.
func TestCheckToolCount_ErrorMessage(t *testing.T) {
	err := CheckToolCount(makeTools(129), 128)
	if err == nil {
		t.Fatal("expected error")
	}
	msg := err.Error()
	if !strings.Contains(msg, "129") {
		t.Errorf("error message should contain actual count 129: %q", msg)
	}
	if !strings.Contains(msg, "128") {
		t.Errorf("error message should contain limit 128: %q", msg)
	}

	err2 := CheckToolCount(makeTools(21), 20)
	if err2 == nil {
		t.Fatal("expected error for count=21 max=20")
	}
	msg2 := err2.Error()
	if !strings.Contains(msg2, "21") {
		t.Errorf("error message should contain actual count 21: %q", msg2)
	}
	if !strings.Contains(msg2, "20") {
		t.Errorf("error message should contain limit 20: %q", msg2)
	}
}