package executor

import (
	"context"
	"io"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/router-for-me/CLIProxyAPI/v8/internal/runtime/executor/helps"
	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v8/sdk/cliproxy/auth"
	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v8/sdk/cliproxy/executor"
	sdktranslator "github.com/router-for-me/CLIProxyAPI/v8/sdk/translator"
	"github.com/tidwall/gjson"
)

func TestCodexExecutorCacheHelper_OpenAIChatCompletions_StablePromptCacheKeyFromAPIKey(t *testing.T) {
	recorder := httptest.NewRecorder()
	ginCtx, _ := gin.CreateTestContext(recorder)
	ginCtx.Set("userApiKey", "test-api-key")

	ctx := context.WithValue(context.Background(), "gin", ginCtx)
	executor := &CodexExecutor{}
	rawJSON := []byte(`{"model":"gpt-5.3-codex","stream":true}`)
	req := cliproxyexecutor.Request{
		Model:   "gpt-5.3-codex",
		Payload: []byte(`{"model":"gpt-5.3-codex"}`),
	}
	url := "https://example.com/responses"

	httpReq, _, err := executor.cacheHelper(ctx, sdktranslator.FromString("openai"), url, req, rawJSON)
	if err != nil {
		t.Fatalf("cacheHelper error: %v", err)
	}

	body, errRead := io.ReadAll(httpReq.Body)
	if errRead != nil {
		t.Fatalf("read request body: %v", errRead)
	}

	expectedKey := uuid.NewSHA1(uuid.NameSpaceOID, []byte("cli-proxy-api:codex:prompt-cache:test-api-key")).String()
	gotKey := gjson.GetBytes(body, "prompt_cache_key").String()
	if gotKey != expectedKey {
		t.Fatalf("prompt_cache_key = %q, want %q", gotKey, expectedKey)
	}
	if gotConversation := httpReq.Header.Get("Conversation_id"); gotConversation != "" {
		t.Fatalf("Conversation_id = %q, want empty", gotConversation)
	}
	if gotSession := httpReq.Header["Session-Id"]; len(gotSession) != 1 || gotSession[0] != expectedKey {
		t.Fatalf("Session-Id = %#v, want [%q]", gotSession, expectedKey)
	}
	if gotLegacySession := httpReq.Header.Get("Session_id"); gotLegacySession != "" {
		t.Fatalf("Session_id = %q, want empty", gotLegacySession)
	}

	httpReq2, _, err := executor.cacheHelper(ctx, sdktranslator.FromString("openai"), url, req, rawJSON)
	if err != nil {
		t.Fatalf("cacheHelper error (second call): %v", err)
	}
	body2, errRead2 := io.ReadAll(httpReq2.Body)
	if errRead2 != nil {
		t.Fatalf("read request body (second call): %v", errRead2)
	}
	gotKey2 := gjson.GetBytes(body2, "prompt_cache_key").String()
	if gotKey2 != expectedKey {
		t.Fatalf("prompt_cache_key (second call) = %q, want %q", gotKey2, expectedKey)
	}
}

func TestCodexExecutorCacheHelper_UsesDerivedSessionUUID(t *testing.T) {
	t.Parallel()

	executor := &CodexExecutor{}
	req := cliproxyexecutor.Request{
		Model:    "gpt-5.4",
		Payload:  []byte(`{"model":"gpt-5.4","messages":[{"role":"user","content":"hello"}]}`),
		Metadata: map[string]any{cliproxyexecutor.DerivedSessionIDMetadataKey: "ctx:v1:derived-root"},
	}
	expectedKey := helps.DerivedSessionUUID("codex", req.Metadata)

	httpReq, body, err := executor.cacheHelper(context.Background(), sdktranslator.FormatOpenAI, "https://example.com/responses", req, []byte(`{"model":"gpt-5.4","stream":true}`))
	if err != nil {
		t.Fatalf("cacheHelper error: %v", err)
	}
	if got := gjson.GetBytes(body, "prompt_cache_key").String(); got != expectedKey {
		t.Fatalf("prompt_cache_key = %q, want %q", got, expectedKey)
	}
	if got := httpReq.Header.Get("Session-Id"); got != expectedKey {
		t.Fatalf("Session-Id = %q, want %q", got, expectedKey)
	}
	if _, errParse := uuid.Parse(expectedKey); errParse != nil {
		t.Fatalf("derived prompt cache key %q is not a UUID: %v", expectedKey, errParse)
	}
}

func TestCodexExecutorCacheHelper_ClaudeUsesClaudeCodeSessionID(t *testing.T) {
	executor := &CodexExecutor{}
	ctx := context.Background()
	url := "https://example.com/responses"
	rawJSON := []byte(`{"model":"gpt-5.4","stream":true}`)
	firstReq := cliproxyexecutor.Request{
		Model: "gpt-5.4-claude-cache-session",
		Payload: []byte(`{
			"model":"gpt-5.4",
			"metadata":{"user_id":"{\"device_id\":\"device-a\",\"account_uuid\":\"\",\"session_id\":\"cache-session-1\"}"},
			"messages":[{"role":"user","content":[{"type":"text","text":"first"}]}]
		}`),
	}
	secondReq := cliproxyexecutor.Request{
		Model: "gpt-5.4-claude-cache-session",
		Payload: []byte(`{
			"model":"gpt-5.4",
			"metadata":{"user_id":"{\"device_id\":\"device-b\",\"account_uuid\":\"\",\"session_id\":\"cache-session-1\"}"},
			"messages":[{"role":"user","content":[{"type":"text","text":"next"}]}]
		}`),
	}

	firstHTTPReq, _, err := executor.cacheHelper(ctx, sdktranslator.FromString("claude"), url, firstReq, rawJSON)
	if err != nil {
		t.Fatalf("cacheHelper first error: %v", err)
	}
	secondHTTPReq, _, err := executor.cacheHelper(ctx, sdktranslator.FromString("claude"), url, secondReq, rawJSON)
	if err != nil {
		t.Fatalf("cacheHelper second error: %v", err)
	}

	firstBody, errRead := io.ReadAll(firstHTTPReq.Body)
	if errRead != nil {
		t.Fatalf("read first request body: %v", errRead)
	}
	secondBody, errRead := io.ReadAll(secondHTTPReq.Body)
	if errRead != nil {
		t.Fatalf("read second request body: %v", errRead)
	}
	firstKey := gjson.GetBytes(firstBody, "prompt_cache_key").String()
	secondKey := gjson.GetBytes(secondBody, "prompt_cache_key").String()
	if firstKey == "" {
		t.Fatalf("first prompt_cache_key is empty; body=%s", string(firstBody))
	}
	if secondKey != firstKey {
		t.Fatalf("same Claude Code session_id produced different prompt_cache_key: first=%q second=%q", firstKey, secondKey)
	}
	if gotSession := firstHTTPReq.Header["Session-Id"]; len(gotSession) != 1 || gotSession[0] != firstKey {
		t.Fatalf("first Session-Id = %#v, want [%q]", gotSession, firstKey)
	}
	if gotSession := secondHTTPReq.Header["Session-Id"]; len(gotSession) != 1 || gotSession[0] != firstKey {
		t.Fatalf("second Session-Id = %#v, want [%q]", gotSession, firstKey)
	}
}

func TestCodexExecutorCacheHelper_ClaudeRejectsBareUserID(t *testing.T) {
	executor := &CodexExecutor{}
	req := cliproxyexecutor.Request{
		Model:   "gpt-5.4-claude-cache-bare-user",
		Payload: []byte(`{"model":"gpt-5.4","metadata":{"user_id":"same-user-across-chats"},"messages":[{"role":"user","content":[{"type":"text","text":"first"}]}]}`),
	}

	httpReq, _, err := executor.cacheHelper(context.Background(), sdktranslator.FromString("claude"), "https://example.com/responses", req, []byte(`{"model":"gpt-5.4","stream":true}`))
	if err != nil {
		t.Fatalf("cacheHelper error: %v", err)
	}

	body, errRead := io.ReadAll(httpReq.Body)
	if errRead != nil {
		t.Fatalf("read request body: %v", errRead)
	}
	if got := gjson.GetBytes(body, "prompt_cache_key").String(); got != "" {
		t.Fatalf("bare metadata.user_id must not create prompt_cache_key, got %q; body=%s", got, string(body))
	}
	if got := httpReq.Header["Session-Id"]; len(got) != 0 {
		t.Fatalf("bare metadata.user_id must not create Session-Id, got %#v", got)
	}
	if got := httpReq.Header.Get("Session_id"); got != "" {
		t.Fatalf("bare metadata.user_id must not create Session_id, got %q", got)
	}
}

func TestApplyCodexHeadersUsesAccountHeaderForOAuth(t *testing.T) {
	httpReq := httptest.NewRequest("POST", "https://example.com/responses", nil)
	auth := &cliproxyauth.Auth{
		Provider: "codex",
		Metadata: map[string]any{"account_id": "acct-1"},
	}

	applyCodexHeaders(httpReq, auth, "oauth-token", true, nil)

	if got := httpReq.Header.Get("Chatgpt-Account-Id"); got != "acct-1" {
		t.Fatalf("Chatgpt-Account-Id = %q, want acct-1", got)
	}
}

func TestCodexExecutorCacheHelper_ClaudeUsesSessionHeader(t *testing.T) {
	executor := &CodexExecutor{}
	recorder := httptest.NewRecorder()
	ginCtx, _ := gin.CreateTestContext(recorder)
	ginCtx.Request = httptest.NewRequest(http.MethodPost, "/v1/messages", nil)
	ginCtx.Request.Header.Set(helps.ClaudeCodeSessionHeader, "cache-session-header")
	ctx := context.WithValue(context.Background(), "gin", ginCtx)

	firstReq := cliproxyexecutor.Request{
		Model:   "gpt-5.4-claude-cache-header",
		Payload: []byte(`{"model":"gpt-5.4","messages":[{"role":"user","content":[{"type":"text","text":"first"}]}]}`),
	}
	secondReq := cliproxyexecutor.Request{
		Model:   "gpt-5.4-claude-cache-header",
		Payload: []byte(`{"model":"gpt-5.4","messages":[{"role":"user","content":[{"type":"text","text":"next"}]}]}`),
	}
	rawJSON := []byte(`{"model":"gpt-5.4","stream":true}`)
	url := "https://example.com/responses"

	firstHTTPReq, _, err := executor.cacheHelper(ctx, sdktranslator.FromString("claude"), url, firstReq, rawJSON)
	if err != nil {
		t.Fatalf("cacheHelper first error: %v", err)
	}
	secondHTTPReq, _, err := executor.cacheHelper(ctx, sdktranslator.FromString("claude"), url, secondReq, rawJSON)
	if err != nil {
		t.Fatalf("cacheHelper second error: %v", err)
	}

	firstBody, errRead := io.ReadAll(firstHTTPReq.Body)
	if errRead != nil {
		t.Fatalf("read first request body: %v", errRead)
	}
	secondBody, errRead := io.ReadAll(secondHTTPReq.Body)
	if errRead != nil {
		t.Fatalf("read second request body: %v", errRead)
	}
	firstKey := gjson.GetBytes(firstBody, "prompt_cache_key").String()
	secondKey := gjson.GetBytes(secondBody, "prompt_cache_key").String()
	if firstKey == "" {
		t.Fatalf("first prompt_cache_key is empty; body=%s", string(firstBody))
	}
	if secondKey != firstKey {
		t.Fatalf("same Claude Code session header produced different prompt_cache_key: first=%q second=%q", firstKey, secondKey)
	}
}

func TestCodexExecutorCacheHelper_ClaudeAgentScopeUsesResolvedModelAcrossHTTPAndWebsocket(t *testing.T) {
	executor := &CodexExecutor{}
	url := "https://example.com/responses"
	req := cliproxyexecutor.Request{
		Model:   "requested-alias-high",
		Payload: []byte(`{"model":"requested-alias","messages":[{"role":"user","content":"hello"}]}`),
	}
	rootHeaders := http.Header{}
	rootHeaders.Set(helps.ClaudeCodeSessionHeader, "resolved-model-session")
	childHeaders := rootHeaders.Clone()
	childHeaders.Set(helps.ClaudeCodeAgentHeader, "agent-a")
	rawJSON := []byte(`{"model":"gpt-5.4","stream":true}`)

	rootRequest, _, errRoot := executor.cacheHelper(context.Background(), sdktranslator.FromString("claude"), url, req, rawJSON, rootHeaders)
	if errRoot != nil {
		t.Fatalf("root cacheHelper error: %v", errRoot)
	}
	rootBody, errReadRoot := io.ReadAll(rootRequest.Body)
	if errReadRoot != nil {
		t.Fatalf("read root body: %v", errReadRoot)
	}
	rootKey := gjson.GetBytes(rootBody, "prompt_cache_key").String()

	childRequest, _, errChild := executor.cacheHelper(context.Background(), sdktranslator.FromString("claude"), url, req, rawJSON, childHeaders)
	if errChild != nil {
		t.Fatalf("child cacheHelper error: %v", errChild)
	}
	childBody, errReadChild := io.ReadAll(childRequest.Body)
	if errReadChild != nil {
		t.Fatalf("read child body: %v", errReadChild)
	}
	childKey := gjson.GetBytes(childBody, "prompt_cache_key").String()
	if rootKey == "" || childKey == "" || rootKey == childKey {
		t.Fatalf("agent prompt keys are not isolated: root=%q child=%q", rootKey, childKey)
	}

	aliasReq := req
	aliasReq.Model = "another-local-alias-low"
	aliasRequest, _, errAlias := executor.cacheHelper(context.Background(), sdktranslator.FromString("claude"), url, aliasReq, rawJSON, childHeaders)
	if errAlias != nil {
		t.Fatalf("alias cacheHelper error: %v", errAlias)
	}
	aliasBody, errReadAlias := io.ReadAll(aliasRequest.Body)
	if errReadAlias != nil {
		t.Fatalf("read alias body: %v", errReadAlias)
	}
	if aliasKey := gjson.GetBytes(aliasBody, "prompt_cache_key").String(); aliasKey != childKey {
		t.Fatalf("resolved model key fragmented by request alias: first=%q alias=%q", childKey, aliasKey)
	}

	websocketBody, _, errWebsocket := applyCodexPromptCacheHeadersWithContext(context.Background(), sdktranslator.FromString("claude"), aliasReq, rawJSON, childHeaders)
	if errWebsocket != nil {
		t.Fatalf("websocket prompt cache error: %v", errWebsocket)
	}
	if websocketKey := gjson.GetBytes(websocketBody, "prompt_cache_key").String(); websocketKey != childKey {
		t.Fatalf("HTTP/WebSocket prompt keys differ: http=%q websocket=%q", childKey, websocketKey)
	}
}