// ingestion/internal/extract/docmark_test.go
package extract

import (
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// mcpToolResult mirrors the shape of docmark's JSON-RPC tools/call response.
type mcpToolResult struct {
	JSONRPC string `json:"jsonrpc"`
	ID      int    `json:"id"`
	Result  *struct {
		Content []struct {
			Type string `json:"type"`
			Text string `json:"text"`
		} `json:"content"`
		IsError bool `json:"isError"`
	} `json:"result,omitempty"`
	Error *struct {
		Message string `json:"message"`
	} `json:"error,omitempty"`
}

// writeMCPResponse mirrors docmark's REAL response framing (empirically
// confirmed against the live server): Content-Type: text/event-stream,
// body is SSE-framed ("event: message\r\ndata: {...}\r\n\r\n"), not bare
// JSON -- inherent to MCP Streamable-HTTP, independent of stateless_http.
func writeMCPResponse(w http.ResponseWriter, body mcpToolResult) {
	payload, _ := json.Marshal(body)
	w.Header().Set("Content-Type", "text/event-stream")
	w.WriteHeader(http.StatusOK)
	_, _ = w.Write([]byte("event: message\r\ndata: "))
	_, _ = w.Write(payload)
	_, _ = w.Write([]byte("\r\n\r\n"))
}

func TestExtractViaDocmark_Success(t *testing.T) {
	var gotAuth, gotAccept string
	var gotBody map[string]any
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotAuth = r.Header.Get("Authorization")
		gotAccept = r.Header.Get("Accept")
		b, _ := io.ReadAll(r.Body)
		_ = json.Unmarshal(b, &gotBody)
		writeMCPResponse(w, mcpToolResult{
			JSONRPC: "2.0", ID: 1,
			Result: &struct {
				Content []struct {
					Type string `json:"type"`
					Text string `json:"text"`
				} `json:"content"`
				IsError bool `json:"isError"`
			}{
				Content: []struct {
					Type string `json:"type"`
					Text string `json:"text"`
				}{{Type: "text", Text: "# Converted\n\nhello"}},
			},
		})
	}))
	defer srv.Close()

	t.Setenv("DOCMARK_URL", srv.URL+"/mcp")
	t.Setenv("DOCMARK_BEARER_TOKEN", "test-token-123")

	dir := t.TempDir()
	path := filepath.Join(dir, "doc.docx")
	require.NoError(t, os.WriteFile(path, []byte("fake docx bytes"), 0o644))

	got, err := extractViaDocmark(path)
	require.NoError(t, err)
	assert.Equal(t, "# Converted\n\nhello", got)
	assert.Equal(t, "Bearer test-token-123", gotAuth)
	assert.Contains(t, gotAccept, "application/json")
	params, _ := gotBody["params"].(map[string]any)
	require.NotNil(t, params)
	assert.Equal(t, "convert_to_markdown", params["name"])
	args, _ := params["arguments"].(map[string]any)
	require.NotNil(t, args)
	assert.Equal(t, "doc.docx", args["filename"])
	assert.NotEmpty(t, args["content_base64"])
}

func TestExtractViaDocmark_NotConfigured(t *testing.T) {
	t.Setenv("DOCMARK_URL", "")

	dir := t.TempDir()
	path := filepath.Join(dir, "doc.docx")
	require.NoError(t, os.WriteFile(path, []byte("x"), 0o644))

	_, err := extractViaDocmark(path)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "DOCMARK_URL")
}

func TestExtractViaDocmark_ToolErrorSurfacesMessage(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		writeMCPResponse(w, mcpToolResult{
			JSONRPC: "2.0", ID: 1,
			Result: &struct {
				Content []struct {
					Type string `json:"type"`
					Text string `json:"text"`
				} `json:"content"`
				IsError bool `json:"isError"`
			}{
				Content: []struct {
					Type string `json:"type"`
					Text string `json:"text"`
				}{{Type: "text", Text: "unsupported format for 'doc.docx'"}},
				IsError: true,
			},
		})
	}))
	defer srv.Close()

	t.Setenv("DOCMARK_URL", srv.URL+"/mcp")
	t.Setenv("DOCMARK_BEARER_TOKEN", "tok")

	dir := t.TempDir()
	path := filepath.Join(dir, "doc.docx")
	require.NoError(t, os.WriteFile(path, []byte("x"), 0o644))

	_, err := extractViaDocmark(path)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "unsupported format")
}

func TestExtractViaDocmark_HTTPErrorSurfaces(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte("unauthorized"))
	}))
	defer srv.Close()

	t.Setenv("DOCMARK_URL", srv.URL+"/mcp")
	t.Setenv("DOCMARK_BEARER_TOKEN", "wrong")

	dir := t.TempDir()
	path := filepath.Join(dir, "doc.docx")
	require.NoError(t, os.WriteFile(path, []byte("x"), 0o644))

	_, err := extractViaDocmark(path)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "401")
}

func TestText_RoutesDocxXlsxPptxImagesToDocmark(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		writeMCPResponse(w, mcpToolResult{
			JSONRPC: "2.0", ID: 1,
			Result: &struct {
				Content []struct {
					Type string `json:"type"`
					Text string `json:"text"`
				} `json:"content"`
				IsError bool `json:"isError"`
			}{
				Content: []struct {
					Type string `json:"type"`
					Text string `json:"text"`
				}{{Type: "text", Text: "converted"}},
			},
		})
	}))
	defer srv.Close()
	t.Setenv("DOCMARK_URL", srv.URL+"/mcp")
	t.Setenv("DOCMARK_BEARER_TOKEN", "tok")

	for _, ext := range []string{".docx", ".xlsx", ".pptx", ".png", ".jpg", ".jpeg"} {
		t.Run(ext, func(t *testing.T) {
			dir := t.TempDir()
			path := filepath.Join(dir, "f"+ext)
			require.NoError(t, os.WriteFile(path, []byte("x"), 0o644))
			got, err := Text(path)
			require.NoError(t, err)
			assert.Equal(t, "converted", got)
		})
	}
}