package service

import (
	"encoding/json"
	"strings"
	"testing"

	"oci-portal/internal/aiwire"
)

func respReq(t *testing.T, raw string) aiwire.RespRequest {
	t.Helper()
	var req aiwire.RespRequest
	if err := json.Unmarshal([]byte(raw), &req); err != nil {
		t.Fatalf("unmarshal req: %v", err)
	}
	return req
}

func deref(p *int) int {
	if p == nil {
		return 0
	}
	return *p
}

func TestRespPassthroughValidate(t *testing.T) {
	prev := "resp_1"
	bg := true
	tests := []struct {
		name    string
		req     aiwire.RespRequest
		wantErr bool
	}{
		{"合法", aiwire.RespRequest{Model: "m", Tools: []aiwire.RespTool{{Type: "web_search"}}}, false},
		{"混用function", aiwire.RespRequest{Model: "m", Tools: []aiwire.RespTool{{Type: "web_search"}, {Type: "function", Name: "f"}}}, false},
		{"缺model", aiwire.RespRequest{Tools: []aiwire.RespTool{{Type: "web_search"}}}, true},
		{"服务端工具流式放行", aiwire.RespRequest{Model: "m", Stream: true, Tools: []aiwire.RespTool{{Type: "web_search"}}}, false},
		{"无工具流式放行", aiwire.RespRequest{Model: "m", Stream: true}, false},
		{"function工具流式放行", aiwire.RespRequest{Model: "m", Stream: true, Tools: []aiwire.RespTool{{Type: "function", Name: "f"}}}, false},
		{"code_interpreter放行", aiwire.RespRequest{Model: "m", Tools: []aiwire.RespTool{{Type: "code_interpreter"}}}, false},
		{"mcp流式放行", aiwire.RespRequest{Model: "m", Stream: true, Tools: []aiwire.RespTool{{Type: "mcp"}}}, false},
		{"有状态拒绝", aiwire.RespRequest{Model: "m", PreviousResponseID: prev}, true},
		{"background拒绝", aiwire.RespRequest{Model: "m", Background: &bg}, true},
		{"未知工具拒绝", aiwire.RespRequest{Model: "m", Tools: []aiwire.RespTool{{Type: "web_search"}, {Type: "file_search"}}}, true},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			err := RespPassthroughValidate(test.req)
			if (err != nil) != test.wantErr {
				t.Fatalf("err = %v, wantErr %v", err, test.wantErr)
			}
		})
	}
}

func TestRespPassthroughBody(t *testing.T) {
	raw := []byte(`{"model":"m","input":"hi","stream":true,"store":true,"max_output_tokens":128,"custom_field":{"a":1.5}}`)
	out, err := RespPassthroughBody(raw)
	if err != nil {
		t.Fatalf("RespPassthroughBody: %v", err)
	}
	var body map[string]any
	if err := json.Unmarshal(out, &body); err != nil {
		t.Fatalf("unmarshal out: %v", err)
	}
	if body["store"] != false {
		t.Errorf("store 应强制 false, got %v", body["store"])
	}
	if body["stream"] != true {
		t.Errorf("stream 应原样保留, got %v", body["stream"])
	}
	if string(out) == "" || !strings.Contains(string(out), `"max_output_tokens":128`) {
		t.Errorf("数值字段应保真: %s", out)
	}
	if !strings.Contains(string(out), `"custom_field"`) {
		t.Errorf("未知字段应保留: %s", out)
	}
	if _, err := RespPassthroughBody([]byte("not-json")); err == nil {
		t.Error("非法 JSON 应报错")
	}
}

func TestRespPassthroughUsage(t *testing.T) {
	tests := []struct {
		name           string
		payload        string
		wantNil        bool
		prompt, cached int
	}{
		{"完整", `{"usage":{"input_tokens":9,"output_tokens":3,"total_tokens":12,"input_tokens_details":{"cached_tokens":5}}}`, false, 9, 5},
		{"无细分", `{"usage":{"input_tokens":9,"output_tokens":3,"total_tokens":12}}`, false, 9, 0},
		{"无usage", `{"id":"resp_1"}`, true, 0, 0},
		{"非法JSON", `xx`, true, 0, 0},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			usage := RespPassthroughUsage([]byte(test.payload))
			if (usage == nil) != test.wantNil {
				t.Fatalf("usage = %v, wantNil %v", usage, test.wantNil)
			}
			if usage == nil {
				return
			}
			if usage.PromptTokens != test.prompt || usage.CachedTokens() != test.cached {
				t.Fatalf("prompt=%d cached=%d, want %d/%d", usage.PromptTokens, usage.CachedTokens(), test.prompt, test.cached)
			}
		})
	}
}

// TestRespStreamCompletedUsage 断言流式 usage 只从 completed 事件提取。
func TestRespStreamCompletedUsage(t *testing.T) {
	completed := []byte(`{"type":"response.completed","response":{"usage":{"input_tokens":10,"output_tokens":5,"total_tokens":15,"input_tokens_details":{"cached_tokens":4}}}}`)
	if u := RespStreamCompletedUsage(completed); u == nil || u.PromptTokens != 10 || u.CompletionTokens != 5 ||
		u.PromptTokensDetails == nil || u.PromptTokensDetails.CachedTokens != 4 {
		t.Fatalf("completed 事件 usage 解析失败: %+v", u)
	}
	for _, data := range []string{
		`{"type":"response.output_text.delta","delta":"hi"}`,
		`{"type":"response.completed"}`,
		`not-json`,
	} {
		if u := RespStreamCompletedUsage([]byte(data)); u != nil {
			t.Fatalf("非 completed 或缺 response 应返回 nil: %s", data)
		}
	}
}