package tools_test

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

	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/tools"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestIssueEditTool(t *testing.T) {
	var captured []byte
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, http.MethodPatch, r.Method)
		assert.Equal(t, "/api/v1/repos/mathias/infra/issues/26", r.URL.Path)
		var err error
		captured, err = io.ReadAll(r.Body)
		require.NoError(t, err)
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"number":26,"title":"new","state":"open","html_url":"http://gitea.example.com/mathias/infra/issues/26"}`))
	}))
	defer srv.Close()

	tool := tools.NewIssueEdit(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"mathias"}))
	out, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"mathias","name":"infra","number":26,"title":"new","body":"updated body"}`))
	require.NoError(t, err)

	var payload map[string]any
	require.NoError(t, json.Unmarshal(captured, &payload))
	assert.Equal(t, "new", payload["title"])
	assert.Equal(t, "updated body", payload["body"])

	assert.Contains(t, string(out), `"number":26`)
}

// Body must be sent verbatim — no identity footer appended (keeps edits idempotent).
func TestIssueEditTool_BodyVerbatim(t *testing.T) {
	var captured []byte
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var err error
		captured, err = io.ReadAll(r.Body)
		require.NoError(t, err)
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"number":26,"state":"open"}`))
	}))
	defer srv.Close()

	tool := tools.NewIssueEdit(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"mathias"}))
	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"mathias","name":"infra","number":26,"body":"exact text"}`))
	require.NoError(t, err)

	var payload map[string]any
	require.NoError(t, json.Unmarshal(captured, &payload))
	assert.Equal(t, "exact text", payload["body"], "body must be unchanged — no footer")
	_, hasTitle := payload["title"]
	assert.False(t, hasTitle, "title must be omitted when not provided")
}

func TestIssueEditTool_RequiresAField(t *testing.T) {
	tool := tools.NewIssueEdit(gitea.NewClient("http://unused", ""), allowlist.New([]string{"mathias"}))
	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"mathias","name":"infra","number":26}`))
	require.Error(t, err)
	assert.ErrorIs(t, err, gitea.ErrValidation)
}

func TestIssueEditTool_NotFound(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNotFound)
		_, _ = w.Write([]byte(`{"message":"issue not found"}`))
	}))
	defer srv.Close()

	tool := tools.NewIssueEdit(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"mathias"}))
	title := "x"
	body, _ := json.Marshal(map[string]any{"owner": "mathias", "name": "infra", "number": 999, "title": title})
	_, err := tool.Call(context.Background(), body)
	require.Error(t, err)
}

func TestIssueEditAllowlistRejects(t *testing.T) {
	tool := tools.NewIssueEdit(gitea.NewClient("http://unused", ""), allowlist.New([]string{"mathias"}))
	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"evil","name":"x","number":1,"title":"y"}`))
	require.Error(t, err)
}