package api

import (
	"context"
	"encoding/json"
	"net/http"
	"strconv"
	"strings"
	"testing"
	"time"

	"gorm.io/gorm"

	"oci-portal/internal/model"
)

// seedGatewayModel 直插启用渠道与模型缓存,绕过云同步。
func seedGatewayModel(t *testing.T, db *gorm.DB, name string) {
	t.Helper()
	ch := &model.AiChannel{Name: "t-" + name, OciConfigID: 1, Region: "r-" + name, Enabled: true, Priority: 1, Weight: 1}
	if err := db.Create(ch).Error; err != nil {
		t.Fatalf("seed channel: %v", err)
	}
	cache := &model.AiModelCache{ChannelID: ch.ID, ModelOcid: "ocid1.." + name, Name: name, Vendor: "v", SyncedAt: time.Now()}
	if err := db.Create(cache).Error; err != nil {
		t.Fatalf("seed model cache: %v", err)
	}
}

func TestAiGatewayKeyModelRestrict(t *testing.T) {
	r, auth, _, db := newTestRouterDB(t)
	token, _, err := auth.Login(context.Background(), "admin", "pass123", "127.0.0.1", "")
	if err != nil {
		t.Fatalf("login: %v", err)
	}

	// 受限密钥:白名单含脏输入,入库应规范化为 2 项(cohere + ghost)
	w := doRequest(t, r, http.MethodPost, "/api/v1/ai-keys", token,
		`{"name":"limited","value":"limited-key-1234","models":[" cohere.command-a-03-2025 ","cohere.command-a-03-2025","","ghost-model"]}`)
	if w.Code != http.StatusCreated {
		t.Fatalf("创建受限密钥 status = %d, body %s", w.Code, w.Body.String())
	}
	var created struct {
		Item model.AiKey `json:"item"`
	}
	if err := json.Unmarshal(w.Body.Bytes(), &created); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if len(created.Item.Models) != 2 || created.Item.Models[0] != "cohere.command-a-03-2025" {
		t.Fatalf("创建后 models 未规范化: %v", created.Item.Models)
	}
	// 不限密钥对照
	w = doRequest(t, r, http.MethodPost, "/api/v1/ai-keys", token, `{"name":"open","value":"open-key-12345"}`)
	if w.Code != http.StatusCreated {
		t.Fatalf("创建不限密钥 status = %d, body %s", w.Code, w.Body.String())
	}

	seedGatewayModel(t, db, "cohere.command-a-03-2025")
	seedGatewayModel(t, db, "meta.llama-3.3-70b-instruct")

	deny := []string{"model_not_found", "无权访问"}
	pass := []string{"未知模型"} // 穿过白名单闸门,由编排层以「未知模型」拒绝(池内无 ghost-model)
	tests := []struct {
		name     string
		key      string
		path     string
		body     string
		wantCode int
		wantSub  []string
	}{
		{"responses 流式同样拦截", "limited-key-1234", "/ai/v1/responses",
			`{"model":"meta.llama-3.3-70b-instruct","stream":true,"input":"hi"}`, 404, deny},
		{"responses 白名单内穿透", "limited-key-1234", "/ai/v1/responses",
			`{"model":"ghost-model","input":"hi"}`, 404, pass},
		{"embeddings 白名单外拦截", "limited-key-1234", "/ai/v1/embeddings",
			`{"model":"meta.llama-3.3-70b-instruct","input":["hi"]}`, 404, deny},
		{"messages 白名单外拦截为 Anthropic 体", "limited-key-1234", "/ai/v1/messages",
			`{"model":"meta.llama-3.3-70b-instruct","max_tokens":16,"messages":[{"role":"user","content":"hi"}]}`, 404,
			[]string{`"type":"error"`, "model_not_found", "无权访问"}},
		{"responses 白名单外拦截", "limited-key-1234", "/ai/v1/responses",
			`{"model":"meta.llama-3.3-70b-instruct","input":"hi"}`, 404, deny},
		{"不限密钥穿透闸门", "open-key-12345", "/ai/v1/responses",
			`{"model":"ghost-model","input":"hi"}`, 404, pass},
		{"chat completions 白名单外拦截", "limited-key-1234", "/ai/v1/chat/completions",
			`{"model":"meta.llama-3.3-70b-instruct","messages":[{"role":"user","content":"hi"}]}`, 404, deny},
		{"chat completions 白名单内穿透", "limited-key-1234", "/ai/v1/chat/completions",
			`{"model":"ghost-model","messages":[{"role":"user","content":"hi"}]}`, 404, pass},
		{"messages 缺 max_tokens 按默认值放行", "open-key-12345", "/ai/v1/messages",
			`{"model":"ghost-model","messages":[{"role":"user","content":"hi"}]}`, 404, pass},
		{"chat completions 缺 messages 拒绝", "open-key-12345", "/ai/v1/chat/completions",
			`{"model":"ghost-model"}`, 400, []string{"invalid_request_error"}},
		{"chat completions 非 function 工具拒绝", "open-key-12345", "/ai/v1/chat/completions",
			`{"model":"ghost-model","messages":[{"role":"user","content":"hi"}],"tools":[{"type":"web_search","function":{}}]}`,
			400, []string{"仅支持 function"}},
		{"chat completions 不支持内容块拒绝", "open-key-12345", "/ai/v1/chat/completions",
			`{"model":"ghost-model","messages":[{"role":"user","content":[{"type":"input_audio"}]}]}`,
			400, []string{"invalid_request_error"}},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := doRequest(t, r, http.MethodPost, tt.path, tt.key, tt.body)
			if w.Code != tt.wantCode {
				t.Fatalf("status = %d, want %d, body %s", w.Code, tt.wantCode, w.Body.String())
			}
			for _, sub := range tt.wantSub {
				if !strings.Contains(w.Body.String(), sub) {
					t.Errorf("body 缺少 %q: %s", sub, w.Body.String())
				}
			}
		})
	}
}

func TestAiGatewayModelsFilteredByKey(t *testing.T) {
	r, auth, _, db := newTestRouterDB(t)
	token, _, err := auth.Login(context.Background(), "admin", "pass123", "127.0.0.1", "")
	if err != nil {
		t.Fatalf("login: %v", err)
	}
	seedGatewayModel(t, db, "cohere.command-a-03-2025")
	seedGatewayModel(t, db, "meta.llama-3.3-70b-instruct")
	w := doRequest(t, r, http.MethodPost, "/api/v1/ai-keys", token,
		`{"name":"limited","value":"limited-key-1234","models":["cohere.command-a-03-2025"]}`)
	if w.Code != http.StatusCreated {
		t.Fatalf("创建密钥 status = %d", w.Code)
	}
	w = doRequest(t, r, http.MethodPost, "/api/v1/ai-keys", token, `{"name":"open","value":"open-key-12345"}`)
	if w.Code != http.StatusCreated {
		t.Fatalf("创建密钥 status = %d", w.Code)
	}

	tests := []struct {
		name    string
		key     string
		want    []string
		notWant []string
	}{
		{"受限密钥仅见交集", "limited-key-1234", []string{"cohere.command-a-03-2025"}, []string{"meta.llama-3.3-70b-instruct"}},
		{"不限密钥全量可见", "open-key-12345", []string{"cohere.command-a-03-2025", "meta.llama-3.3-70b-instruct"}, nil},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := doRequest(t, r, http.MethodGet, "/ai/v1/models", tt.key, "")
			if w.Code != http.StatusOK {
				t.Fatalf("status = %d, body %s", w.Code, w.Body.String())
			}
			for _, sub := range tt.want {
				if !strings.Contains(w.Body.String(), sub) {
					t.Errorf("应包含 %q: %s", sub, w.Body.String())
				}
			}
			for _, sub := range tt.notWant {
				if strings.Contains(w.Body.String(), sub) {
					t.Errorf("不应包含 %q: %s", sub, w.Body.String())
				}
			}
		})
	}
}

func TestAiKeyModelsUpdateRoundTrip(t *testing.T) {
	r, auth, _, _ := newTestRouterDB(t)
	token, _, err := auth.Login(context.Background(), "admin", "pass123", "127.0.0.1", "")
	if err != nil {
		t.Fatalf("login: %v", err)
	}
	w := doRequest(t, r, http.MethodPost, "/api/v1/ai-keys", token, `{"name":"k","value":"round-key-1234"}`)
	if w.Code != http.StatusCreated {
		t.Fatalf("创建 status = %d", w.Code)
	}
	var created struct {
		Item model.AiKey `json:"item"`
	}
	_ = json.Unmarshal(w.Body.Bytes(), &created)
	id := created.Item.ID

	listModels := func() []string {
		w := doRequest(t, r, http.MethodGet, "/api/v1/ai-keys", token, "")
		var resp struct {
			Items []model.AiKey `json:"items"`
		}
		_ = json.Unmarshal(w.Body.Bytes(), &resp)
		for _, k := range resp.Items {
			if k.ID == id {
				return k.Models
			}
		}
		t.Fatalf("密钥 %d 不在列表中", id)
		return nil
	}

	tests := []struct {
		name string
		body string
		want []string
	}{
		{"设置白名单", `{"models":[" a-model ","a-model","b-model"]}`, []string{"a-model", "b-model"}},
		{"不传 models 保持不变", `{"name":"k2"}`, []string{"a-model", "b-model"}},
		{"空数组清空恢复不限", `{"models":[]}`, nil},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := doRequest(t, r, http.MethodPut, "/api/v1/ai-keys/"+strconv.Itoa(int(id)), token, tt.body)
			if w.Code != http.StatusNoContent {
				t.Fatalf("update status = %d, body %s", w.Code, w.Body.String())
			}
			got := listModels()
			if len(got) != len(tt.want) {
				t.Fatalf("models = %v, want %v", got, tt.want)
			}
			for i := range tt.want {
				if got[i] != tt.want[i] {
					t.Fatalf("models = %v, want %v", got, tt.want)
				}
			}
		})
	}
}