package cmd

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

	"google.golang.org/api/option"
	"google.golang.org/api/sheets/v4"

	"github.com/steipete/gogcli/internal/ui"
)

func TestSheetsInsertCmd(t *testing.T) {
	origNew := newSheetsService
	t.Cleanup(func() { newSheetsService = origNew })

	var gotInsert *sheets.InsertDimensionRequest

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		path := strings.TrimPrefix(r.URL.Path, "/sheets/v4")
		path = strings.TrimPrefix(path, "/v4")
		switch {
		case strings.HasPrefix(path, "/spreadsheets/s1") && r.Method == http.MethodGet:
			w.Header().Set("Content-Type", "application/json")
			_ = json.NewEncoder(w).Encode(map[string]any{
				"spreadsheetId": "s1",
				"sheets": []map[string]any{
					{"properties": map[string]any{"sheetId": 7, "title": "Data"}},
				},
			})
			return
		case strings.Contains(path, "/spreadsheets/s1:batchUpdate") && r.Method == http.MethodPost:
			var req sheets.BatchUpdateSpreadsheetRequest
			if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
				t.Fatalf("decode batchUpdate: %v", err)
			}
			if len(req.Requests) != 1 || req.Requests[0].InsertDimension == nil {
				t.Fatalf("expected insertDimension request, got %#v", req.Requests)
			}
			gotInsert = req.Requests[0].InsertDimension
			w.Header().Set("Content-Type", "application/json")
			_ = json.NewEncoder(w).Encode(map[string]any{})
			return
		default:
			http.NotFound(w, r)
			return
		}
	}))
	defer srv.Close()

	svc, err := sheets.NewService(context.Background(),
		option.WithoutAuthentication(),
		option.WithHTTPClient(srv.Client()),
		option.WithEndpoint(srv.URL+"/"),
	)
	if err != nil {
		t.Fatalf("NewService: %v", err)
	}
	newSheetsService = func(context.Context, string) (*sheets.Service, error) { return svc, nil }

	flags := &RootFlags{Account: "a@b.com"}
	u, uiErr := ui.New(ui.Options{Stdout: io.Discard, Stderr: io.Discard, Color: "never"})
	if uiErr != nil {
		t.Fatalf("ui.New: %v", uiErr)
	}
	ctx := ui.WithUI(context.Background(), u)

	t.Run("insert rows before", func(t *testing.T) {
		gotInsert = nil
		cmd := &SheetsInsertCmd{}
		if err := runKong(t, cmd, []string{
			"s1", "Data", "rows", "2", "--count", "3",
		}, ctx, flags); err != nil {
			t.Fatalf("insert rows: %v", err)
		}

		if gotInsert == nil {
			t.Fatal("expected insertDimension request")
		}
		if gotInsert.Range.SheetId != 7 {
			t.Fatalf("unexpected sheet id: %d", gotInsert.Range.SheetId)
		}
		if gotInsert.Range.Dimension != "ROWS" {
			t.Fatalf("unexpected dimension: %s", gotInsert.Range.Dimension)
		}
		// startRow=2 → startIndex=1, endIndex=1+3=4
		if gotInsert.Range.StartIndex != 1 {
			t.Fatalf("unexpected startIndex: %d, want 1", gotInsert.Range.StartIndex)
		}
		if gotInsert.Range.EndIndex != 4 {
			t.Fatalf("unexpected endIndex: %d, want 4", gotInsert.Range.EndIndex)
		}
		if gotInsert.InheritFromBefore {
			t.Fatal("expected inheritFromBefore=false")
		}
	})

	t.Run("insert rows after", func(t *testing.T) {
		gotInsert = nil
		cmd := &SheetsInsertCmd{}
		if err := runKong(t, cmd, []string{
			"s1", "Data", "rows", "2", "--count", "1", "--after",
		}, ctx, flags); err != nil {
			t.Fatalf("insert rows: %v", err)
		}

		if gotInsert == nil {
			t.Fatal("expected insertDimension request")
		}
		// startRow=2 --after → startIndex=2, endIndex=3
		if gotInsert.Range.StartIndex != 2 {
			t.Fatalf("unexpected startIndex: %d, want 2", gotInsert.Range.StartIndex)
		}
		if gotInsert.Range.EndIndex != 3 {
			t.Fatalf("unexpected endIndex: %d, want 3", gotInsert.Range.EndIndex)
		}
		if !gotInsert.InheritFromBefore {
			t.Fatal("expected inheritFromBefore=true")
		}
	})

	t.Run("insert cols before", func(t *testing.T) {
		gotInsert = nil
		cmd := &SheetsInsertCmd{}
		if err := runKong(t, cmd, []string{
			"s1", "Data", "cols", "3", "--count", "2",
		}, ctx, flags); err != nil {
			t.Fatalf("insert cols: %v", err)
		}

		if gotInsert == nil {
			t.Fatal("expected insertDimension request")
		}
		if gotInsert.Range.Dimension != "COLUMNS" {
			t.Fatalf("unexpected dimension: %s", gotInsert.Range.Dimension)
		}
		// startCol=3 → startIndex=2, endIndex=2+2=4
		if gotInsert.Range.StartIndex != 2 {
			t.Fatalf("unexpected startIndex: %d, want 2", gotInsert.Range.StartIndex)
		}
		if gotInsert.Range.EndIndex != 4 {
			t.Fatalf("unexpected endIndex: %d, want 4", gotInsert.Range.EndIndex)
		}
	})

	t.Run("insert cols after", func(t *testing.T) {
		gotInsert = nil
		cmd := &SheetsInsertCmd{}
		if err := runKong(t, cmd, []string{
			"s1", "Data", "cols", "3", "--count", "1", "--after",
		}, ctx, flags); err != nil {
			t.Fatalf("insert cols: %v", err)
		}

		if gotInsert == nil {
			t.Fatal("expected insertDimension request")
		}
		// startCol=3 --after → startIndex=3, endIndex=4
		if gotInsert.Range.StartIndex != 3 {
			t.Fatalf("unexpected startIndex: %d, want 3", gotInsert.Range.StartIndex)
		}
		if gotInsert.Range.EndIndex != 4 {
			t.Fatalf("unexpected endIndex: %d, want 4", gotInsert.Range.EndIndex)
		}
		if !gotInsert.InheritFromBefore {
			t.Fatal("expected inheritFromBefore=true")
		}
	})

	t.Run("invalid dimension", func(t *testing.T) {
		cmd := &SheetsInsertCmd{}
		err := runKong(t, cmd, []string{
			"s1", "Data", "sheets", "1",
		}, ctx, flags)
		if err == nil {
			t.Fatal("expected error for invalid dimension")
		}
		if !strings.Contains(err.Error(), "dimension must be rows or cols") {
			t.Fatalf("unexpected error: %v", err)
		}
	})
}