package executor

import (
	"bytes"
	"context"
	"encoding/json"
	"io"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executor"
	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"
	"github.com/tidwall/gjson"
)

func newCodexOpenAIImageTestAuth(serverURL string) *cliproxyauth.Auth {
	return &cliproxyauth.Auth{
		Provider: "codex",
		Attributes: map[string]string{
			"base_url": serverURL,
			"api_key":  "codex-token",
		},
	}
}

func codexOpenAIImageTestOptions(path string, stream bool) cliproxyexecutor.Options {
	return cliproxyexecutor.Options{
		SourceFormat: sdktranslator.FromString(codexOpenAIImageSourceFormat),
		Stream:       stream,
		Metadata: map[string]any{
			cliproxyexecutor.RequestPathMetadataKey: path,
		},
	}
}

func TestCodexExecutorDirectOpenAIImageGenerationUsesImagesEndpoint(t *testing.T) {
	var gotPath string
	var gotAuth string
	var gotAccept string
	var gotBody []byte
	upstreamBody := []byte(`{"created":1713833628,"data":[{"b64_json":"AA=="}],"usage":{"total_tokens":100,"input_tokens":50,"output_tokens":50}}`)
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotPath = r.URL.Path
		gotAuth = r.Header.Get("Authorization")
		gotAccept = r.Header.Get("Accept")
		var errRead error
		gotBody, errRead = io.ReadAll(r.Body)
		if errRead != nil {
			t.Fatalf("read body: %v", errRead)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write(upstreamBody)
	}))
	defer server.Close()

	executor := NewCodexExecutor(&config.Config{})
	resp, errExecute := executor.Execute(context.Background(), newCodexOpenAIImageTestAuth(server.URL), cliproxyexecutor.Request{
		Model:   "codex/gpt-image-1.5",
		Payload: []byte(`{"model":"codex/gpt-image-1.5","prompt":"A cute baby sea otter","n":1,"size":"1024x1024","quality":"high","background":"opaque","output_format":"jpeg","output_compression":70,"moderation":"low","extra":{"preserve":true},"stream":false}`),
	}, codexOpenAIImageTestOptions(codexImagesGenerationsPath, false))
	if errExecute != nil {
		t.Fatalf("Execute() error = %v", errExecute)
	}

	if gotPath != "/images/generations" {
		t.Fatalf("path = %q, want /images/generations", gotPath)
	}
	if gotAuth != "Bearer codex-token" {
		t.Fatalf("Authorization = %q, want Bearer codex-token", gotAuth)
	}
	if gotAccept != "application/json" {
		t.Fatalf("Accept = %q, want application/json", gotAccept)
	}
	if got := gjson.GetBytes(gotBody, "model").String(); got != "gpt-image-1.5" {
		t.Fatalf("model = %q, want gpt-image-1.5; body=%s", got, string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "extra.preserve").Bool(); !got {
		t.Fatalf("extra.preserve missing from body: %s", string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "output_compression").Int(); got != 70 {
		t.Fatalf("output_compression = %d, want 70; body=%s", got, string(gotBody))
	}
	if gjson.GetBytes(gotBody, "stream").Exists() {
		t.Fatalf("stream should be removed for non-stream execution: %s", string(gotBody))
	}
	if !bytes.Equal(resp.Payload, upstreamBody) {
		t.Fatalf("payload = %s, want %s", string(resp.Payload), string(upstreamBody))
	}
}

func TestCodexExecutorDirectOpenAIImageGenerationStreamsImagesEndpoint(t *testing.T) {
	var gotPath string
	var gotAccept string
	var gotBody []byte
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotPath = r.URL.Path
		gotAccept = r.Header.Get("Accept")
		var errRead error
		gotBody, errRead = io.ReadAll(r.Body)
		if errRead != nil {
			t.Fatalf("read body: %v", errRead)
		}
		w.Header().Set("Content-Type", "text/event-stream")
		_, _ = w.Write([]byte("event: image_generation.partial_image\ndata: {\"type\":\"image_generation.partial_image\",\"b64_json\":\"AA==\",\"partial_image_index\":0}\n\n"))
		_, _ = w.Write([]byte("event: image_generation.completed\ndata: {\"type\":\"image_generation.completed\",\"b64_json\":\"BB==\",\"usage\":{\"total_tokens\":10,\"input_tokens\":4,\"output_tokens\":6}}\n\n"))
	}))
	defer server.Close()

	executor := NewCodexExecutor(&config.Config{})
	stream, errStream := executor.ExecuteStream(context.Background(), newCodexOpenAIImageTestAuth(server.URL), cliproxyexecutor.Request{
		Model:   "gpt-image-2",
		Payload: []byte(`{"model":"gpt-image-2","prompt":"A cute baby sea otter","partial_images":2}`),
	}, codexOpenAIImageTestOptions(codexImagesGenerationsPath, true))
	if errStream != nil {
		t.Fatalf("ExecuteStream() error = %v", errStream)
	}

	var combined bytes.Buffer
	for chunk := range stream.Chunks {
		if chunk.Err != nil {
			t.Fatalf("stream chunk error = %v", chunk.Err)
		}
		combined.Write(chunk.Payload)
	}

	if gotPath != "/images/generations" {
		t.Fatalf("path = %q, want /images/generations", gotPath)
	}
	if gotAccept != "text/event-stream" {
		t.Fatalf("Accept = %q, want text/event-stream", gotAccept)
	}
	if !gjson.GetBytes(gotBody, "stream").Bool() {
		t.Fatalf("stream flag missing from upstream body: %s", string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "partial_images").Int(); got != 2 {
		t.Fatalf("partial_images = %d, want 2; body=%s", got, string(gotBody))
	}
	out := combined.String()
	if !strings.Contains(out, "event: image_generation.partial_image") || !strings.Contains(out, "event: image_generation.completed") {
		t.Fatalf("stream output missing image events: %q", out)
	}
}

func TestCodexExecutorDirectOpenAIImageEditUsesImagesEditEndpointForJSON(t *testing.T) {
	var gotPath string
	var gotBody []byte
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotPath = r.URL.Path
		var errRead error
		gotBody, errRead = io.ReadAll(r.Body)
		if errRead != nil {
			t.Fatalf("read body: %v", errRead)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"created":1713833628,"data":[{"b64_json":"AA=="}],"usage":{"total_tokens":10}}`))
	}))
	defer server.Close()

	executor := NewCodexExecutor(&config.Config{})
	_, errExecute := executor.Execute(context.Background(), newCodexOpenAIImageTestAuth(server.URL), cliproxyexecutor.Request{
		Model:   "gpt-image-2",
		Payload: []byte(`{"model":"gpt-image-2","prompt":"Replace the background","images":[{"file_id":"file-abc123"}],"mask":{"file_id":"file-mask123"},"size":"1024x1024","quality":"high","output_format":"png","output_compression":100,"stream":false}`),
	}, codexOpenAIImageTestOptions(codexImagesEditsPath, false))
	if errExecute != nil {
		t.Fatalf("Execute() error = %v", errExecute)
	}

	if gotPath != "/images/edit" {
		t.Fatalf("path = %q, want /images/edit", gotPath)
	}
	if got := gjson.GetBytes(gotBody, "model").String(); got != "gpt-image-2" {
		t.Fatalf("model = %q, want gpt-image-2; body=%s", got, string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "images.0.file_id").String(); got != "file-abc123" {
		t.Fatalf("images.0.file_id = %q, want file-abc123; body=%s", got, string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "mask.file_id").String(); got != "file-mask123" {
		t.Fatalf("mask.file_id = %q, want file-mask123; body=%s", got, string(gotBody))
	}
	if gjson.GetBytes(gotBody, "stream").Exists() {
		t.Fatalf("stream should be removed for non-stream execution: %s", string(gotBody))
	}
}

func TestCodexExecutorDirectOpenAIImageEditUsesImagesEditEndpointForMultipart(t *testing.T) {
	var body bytes.Buffer
	writer := multipart.NewWriter(&body)
	if errWrite := writer.WriteField("model", "codex/gpt-image-1.5"); errWrite != nil {
		t.Fatalf("write model field: %v", errWrite)
	}
	if errWrite := writer.WriteField("prompt", "Create a lovely gift basket"); errWrite != nil {
		t.Fatalf("write prompt field: %v", errWrite)
	}
	if errWrite := writer.WriteField("output_format", "webp"); errWrite != nil {
		t.Fatalf("write output_format field: %v", errWrite)
	}
	if errWrite := writer.WriteField("n", "2"); errWrite != nil {
		t.Fatalf("write n field: %v", errWrite)
	}
	if errWrite := writer.WriteField("stream", "false"); errWrite != nil {
		t.Fatalf("write stream field: %v", errWrite)
	}
	imagePart, errCreate := writer.CreateFormFile("image[]", "source.png")
	if errCreate != nil {
		t.Fatalf("create image field: %v", errCreate)
	}
	if _, errWrite := imagePart.Write([]byte("png-data")); errWrite != nil {
		t.Fatalf("write image data: %v", errWrite)
	}
	maskPart, errCreateMask := writer.CreateFormFile("mask", "mask.png")
	if errCreateMask != nil {
		t.Fatalf("create mask field: %v", errCreateMask)
	}
	if _, errWrite := maskPart.Write([]byte("mask-data")); errWrite != nil {
		t.Fatalf("write mask data: %v", errWrite)
	}
	if errClose := writer.Close(); errClose != nil {
		t.Fatalf("close multipart writer: %v", errClose)
	}

	var gotPath string
	var gotContentType string
	var gotBody []byte
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotPath = r.URL.Path
		gotContentType = r.Header.Get("Content-Type")
		var errRead error
		gotBody, errRead = io.ReadAll(r.Body)
		if errRead != nil {
			t.Fatalf("read body: %v", errRead)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"created":1713833628,"data":[{"b64_json":"AA=="}]}`))
	}))
	defer server.Close()

	opts := codexOpenAIImageTestOptions(codexImagesEditsPath, false)
	opts.Headers = http.Header{"Content-Type": []string{writer.FormDataContentType()}}
	executor := NewCodexExecutor(&config.Config{})
	_, errExecute := executor.Execute(context.Background(), newCodexOpenAIImageTestAuth(server.URL), cliproxyexecutor.Request{
		Model:   "codex/gpt-image-1.5",
		Payload: body.Bytes(),
	}, opts)
	if errExecute != nil {
		t.Fatalf("Execute() error = %v", errExecute)
	}

	if gotPath != "/images/edit" {
		t.Fatalf("path = %q, want /images/edit", gotPath)
	}
	if !strings.HasPrefix(gotContentType, "application/json") {
		t.Fatalf("Content-Type = %q, want application/json", gotContentType)
	}
	if !json.Valid(gotBody) {
		t.Fatalf("body is not valid JSON: %s", string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "model").String(); got != "gpt-image-1.5" {
		t.Fatalf("model = %q, want gpt-image-1.5; body=%s", got, string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "prompt").String(); got != "Create a lovely gift basket" {
		t.Fatalf("prompt = %q", got)
	}
	if got := gjson.GetBytes(gotBody, "output_format").String(); got != "webp" {
		t.Fatalf("output_format = %q, want webp; body=%s", got, string(gotBody))
	}
	if got := gjson.GetBytes(gotBody, "n").Int(); got != 2 {
		t.Fatalf("n = %d, want 2; body=%s", got, string(gotBody))
	}
	if gjson.GetBytes(gotBody, "stream").Exists() {
		t.Fatalf("stream should be removed for non-stream execution: %s", string(gotBody))
	}
	imageURL := gjson.GetBytes(gotBody, "images.0.image_url").String()
	if !strings.Contains(imageURL, ";base64,cG5nLWRhdGE=") {
		t.Fatalf("images.0.image_url = %q, want png-data data URL; body=%s", imageURL, string(gotBody))
	}
	maskURL := gjson.GetBytes(gotBody, "mask.image_url").String()
	if !strings.Contains(maskURL, ";base64,bWFzay1kYXRh") {
		t.Fatalf("mask.image_url = %q, want mask-data data URL; body=%s", maskURL, string(gotBody))
	}
}