//go:build unit

package service

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/require"

	"github.com/Wei-Shaw/sub2api/internal/pkg/tlsfingerprint"
)

// --- shared test helpers ---

type queuedHTTPUpstream struct {
	responses []*http.Response
	requests  []*http.Request
	tlsFlags  []bool
}

func (u *queuedHTTPUpstream) Do(_ *http.Request, _ string, _ int64, _ int) (*http.Response, error) {
	return nil, fmt.Errorf("unexpected Do call")
}

func (u *queuedHTTPUpstream) DoWithTLS(req *http.Request, _ string, _ int64, _ int, profile *tlsfingerprint.Profile) (*http.Response, error) {
	u.requests = append(u.requests, req)
	u.tlsFlags = append(u.tlsFlags, profile != nil)
	if len(u.responses) == 0 {
		return nil, fmt.Errorf("no mocked response")
	}
	resp := u.responses[0]
	u.responses = u.responses[1:]
	return resp, nil
}

func newJSONResponse(status int, body string) *http.Response {
	return &http.Response{
		StatusCode: status,
		Header:     make(http.Header),
		Body:       io.NopCloser(strings.NewReader(body)),
	}
}

// --- test functions ---

func newTestContext() (*gin.Context, *httptest.ResponseRecorder) {
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/api/v1/admin/accounts/1/test", nil)
	return c, rec
}

type openAIAccountTestRepo struct {
	mockAccountRepoForGemini
	updatedExtra   map[string]any
	rateLimitedID  int64
	rateLimitedAt  *time.Time
	clearedErrorID int64
	setErrorID     int64
	setErrorMsg    string
}

func (r *openAIAccountTestRepo) UpdateExtra(_ context.Context, _ int64, updates map[string]any) error {
	r.updatedExtra = updates
	return nil
}

func (r *openAIAccountTestRepo) SetRateLimited(_ context.Context, id int64, resetAt time.Time) error {
	r.rateLimitedID = id
	r.rateLimitedAt = &resetAt
	return nil
}

func (r *openAIAccountTestRepo) ClearError(_ context.Context, id int64) error {
	r.clearedErrorID = id
	return nil
}

func (r *openAIAccountTestRepo) SetError(_ context.Context, id int64, errorMsg string) error {
	r.setErrorID = id
	r.setErrorMsg = errorMsg
	return nil
}

func TestAccountTestService_OpenAISuccessPersistsSnapshotFromHeaders(t *testing.T) {
	gin.SetMode(gin.TestMode)
	ctx, recorder := newTestContext()

	resp := newJSONResponse(http.StatusOK, "")
	resp.Body = io.NopCloser(strings.NewReader(`data: {"type":"response.completed"}

`))
	resp.Header.Set("x-codex-primary-used-percent", "88")
	resp.Header.Set("x-codex-primary-reset-after-seconds", "604800")
	resp.Header.Set("x-codex-primary-window-minutes", "10080")
	resp.Header.Set("x-codex-secondary-used-percent", "42")
	resp.Header.Set("x-codex-secondary-reset-after-seconds", "18000")
	resp.Header.Set("x-codex-secondary-window-minutes", "300")

	repo := &openAIAccountTestRepo{}
	upstream := &queuedHTTPUpstream{responses: []*http.Response{resp}}
	svc := &AccountTestService{accountRepo: repo, httpUpstream: upstream}
	account := &Account{
		ID:          89,
		Platform:    PlatformOpenAI,
		Type:        AccountTypeOAuth,
		Concurrency: 1,
		Credentials: map[string]any{"access_token": "test-token"},
	}

	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "", "")
	require.NoError(t, err)
	require.NotEmpty(t, repo.updatedExtra)
	require.Equal(t, 42.0, repo.updatedExtra["codex_5h_used_percent"])
	require.Equal(t, 88.0, repo.updatedExtra["codex_7d_used_percent"])
	require.Contains(t, recorder.Body.String(), "test_complete")
}

func TestAccountTestService_OpenAI429PersistsSnapshotAndRateLimitState(t *testing.T) {
	gin.SetMode(gin.TestMode)
	ctx, _ := newTestContext()

	resp := newJSONResponse(http.StatusTooManyRequests, `{"error":{"type":"usage_limit_reached","message":"limit reached","resets_at":1777283883}}`)
	resp.Header.Set("x-codex-primary-used-percent", "100")
	resp.Header.Set("x-codex-primary-reset-after-seconds", "604800")
	resp.Header.Set("x-codex-primary-window-minutes", "10080")
	resp.Header.Set("x-codex-secondary-used-percent", "100")
	resp.Header.Set("x-codex-secondary-reset-after-seconds", "18000")
	resp.Header.Set("x-codex-secondary-window-minutes", "300")

	repo := &openAIAccountTestRepo{}
	upstream := &queuedHTTPUpstream{responses: []*http.Response{resp}}
	svc := &AccountTestService{accountRepo: repo, httpUpstream: upstream}
	account := &Account{
		ID:          88,
		Platform:    PlatformOpenAI,
		Type:        AccountTypeOAuth,
		Status:      StatusError,
		Concurrency: 1,
		Credentials: map[string]any{"access_token": "test-token"},
	}

	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "", "")
	require.Error(t, err)
	require.NotEmpty(t, repo.updatedExtra)
	require.Equal(t, 100.0, repo.updatedExtra["codex_5h_used_percent"])
	require.Equal(t, account.ID, repo.rateLimitedID)
	require.NotNil(t, repo.rateLimitedAt)
	require.Equal(t, account.ID, repo.clearedErrorID)
	require.Equal(t, StatusActive, account.Status)
	require.Empty(t, account.ErrorMessage)
	require.NotNil(t, account.RateLimitResetAt)
}

func TestAccountTestService_OpenAI429BodyOnlyPersistsRateLimitAndClearsStaleError(t *testing.T) {
	gin.SetMode(gin.TestMode)
	ctx, _ := newTestContext()

	resp := newJSONResponse(http.StatusTooManyRequests, `{"error":{"type":"usage_limit_reached","message":"limit reached","resets_at":"1777283883"}}`)

	repo := &openAIAccountTestRepo{}
	upstream := &queuedHTTPUpstream{responses: []*http.Response{resp}}
	svc := &AccountTestService{accountRepo: repo, httpUpstream: upstream}
	account := &Account{
		ID:           77,
		Platform:     PlatformOpenAI,
		Type:         AccountTypeOAuth,
		Status:       StatusError,
		ErrorMessage: "Access forbidden (403): account may be suspended or lack permissions",
		Concurrency:  1,
		Credentials:  map[string]any{"access_token": "test-token"},
	}

	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "", "")
	require.Error(t, err)
	require.Equal(t, account.ID, repo.rateLimitedID)
	require.NotNil(t, repo.rateLimitedAt)
	require.Equal(t, account.ID, repo.clearedErrorID)
	require.Equal(t, StatusActive, account.Status)
	require.Empty(t, account.ErrorMessage)
	require.NotNil(t, account.RateLimitResetAt)
	require.Empty(t, repo.updatedExtra)
}

func TestAccountTestService_OpenAI429ActiveAccountDoesNotClearError(t *testing.T) {
	gin.SetMode(gin.TestMode)
	ctx, _ := newTestContext()

	resp := newJSONResponse(http.StatusTooManyRequests, `{"error":{"type":"usage_limit_reached","message":"limit reached","resets_in_seconds":3600}}`)

	repo := &openAIAccountTestRepo{}
	upstream := &queuedHTTPUpstream{responses: []*http.Response{resp}}
	svc := &AccountTestService{accountRepo: repo, httpUpstream: upstream}
	account := &Account{
		ID:          78,
		Platform:    PlatformOpenAI,
		Type:        AccountTypeOAuth,
		Status:      StatusActive,
		Concurrency: 1,
		Credentials: map[string]any{"access_token": "test-token"},
	}

	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "", "")
	require.Error(t, err)
	require.Equal(t, account.ID, repo.rateLimitedID)
	require.NotNil(t, repo.rateLimitedAt)
	require.Zero(t, repo.clearedErrorID)
	require.Equal(t, StatusActive, account.Status)
	require.NotNil(t, account.RateLimitResetAt)
}

func TestAccountTestService_OpenAI429WithoutResetSignalDoesNotMutateRuntimeState(t *testing.T) {
	gin.SetMode(gin.TestMode)
	ctx, _ := newTestContext()

	resp := newJSONResponse(http.StatusTooManyRequests, `{"error":{"type":"usage_limit_reached","message":"limit reached"}}`)

	repo := &openAIAccountTestRepo{}
	upstream := &queuedHTTPUpstream{responses: []*http.Response{resp}}
	svc := &AccountTestService{accountRepo: repo, httpUpstream: upstream}
	account := &Account{
		ID:           79,
		Platform:     PlatformOpenAI,
		Type:         AccountTypeOAuth,
		Status:       StatusError,
		ErrorMessage: "stale 403",
		Concurrency:  1,
		Credentials:  map[string]any{"access_token": "test-token"},
	}

	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "", "")
	require.Error(t, err)
	require.Zero(t, repo.rateLimitedID)
	require.Nil(t, repo.rateLimitedAt)
	require.Zero(t, repo.clearedErrorID)
	require.Equal(t, StatusError, account.Status)
	require.Equal(t, "stale 403", account.ErrorMessage)
	require.Nil(t, account.RateLimitResetAt)
}

func TestAccountTestService_OpenAI401SetsPermanentErrorOnly(t *testing.T) {
	gin.SetMode(gin.TestMode)
	ctx, _ := newTestContext()

	resp := newJSONResponse(http.StatusUnauthorized, `{"error":"bad token"}`)

	repo := &openAIAccountTestRepo{}
	upstream := &queuedHTTPUpstream{responses: []*http.Response{resp}}
	svc := &AccountTestService{accountRepo: repo, httpUpstream: upstream}
	account := &Account{
		ID:          80,
		Platform:    PlatformOpenAI,
		Type:        AccountTypeOAuth,
		Status:      StatusActive,
		Concurrency: 1,
		Credentials: map[string]any{"access_token": "test-token"},
	}

	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "", "")
	require.Error(t, err)
	require.Equal(t, account.ID, repo.setErrorID)
	require.Contains(t, repo.setErrorMsg, "Authentication failed (401)")
	require.Zero(t, repo.rateLimitedID)
	require.Zero(t, repo.clearedErrorID)
	require.Nil(t, account.RateLimitResetAt)
}