package tools_test

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

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

func TestPRMergeSuccess(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, "/api/v1/repos/owner/repo/pulls/7/merge", r.URL.Path)
		w.WriteHeader(http.StatusNoContent)
	}))
	defer srv.Close()

	tool := tools.NewPRMerge(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
	out, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"owner","name":"repo","index":7}`))
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(out, &result))
	assert.Equal(t, true, result["merged"])
}

func TestPRMergeDefaultsToMergeStyle(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.WriteHeader(http.StatusNoContent)
	}))
	defer srv.Close()

	tool := tools.NewPRMerge(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"owner","name":"repo","index":7}`))
	require.NoError(t, err)

	var payload map[string]any
	require.NoError(t, json.Unmarshal(captured, &payload))
	assert.Equal(t, "merge", payload["Do"])
}

func TestPRMergeConflictReturnsError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusConflict)
		_, _ = w.Write([]byte(`{"message":"merge conflict"}`))
	}))
	defer srv.Close()

	tool := tools.NewPRMerge(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"owner","name":"repo","index":7}`))
	require.Error(t, err)
	assert.ErrorIs(t, err, gitea.ErrConflict)
}

// #45: pr_merge advertises the canonical `number` (was `index`); `index` stays
// an accepted alias via the shim.
func TestPRMergeNumberCanonical(t *testing.T) {
	sch := string(tools.NewPRMerge(gitea.NewClient("http://unused", ""), allowlist.New([]string{"owner"})).Descriptor().InputSchema)
	assert.Contains(t, sch, `"number":`, "pr_merge must advertise number")
	assert.NotContains(t, sch, `"index":`, "pr_merge must not advertise index")

	for _, args := range []string{
		`{"owner":"owner","repo":"repo","number":7}`,
		`{"owner":"owner","repo":"repo","index":7}`,
	} {
		var gotPath string
		srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			gotPath = r.URL.Path
			w.WriteHeader(http.StatusNoContent)
		}))
		tool := tools.NewPRMerge(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
		_, err := tool.Call(context.Background(), json.RawMessage(args))
		require.NoError(t, err, args)
		assert.Equal(t, "/api/v1/repos/owner/repo/pulls/7/merge", gotPath, args)
		srv.Close()
	}
}

func TestPRMergeAllowlistRejects(t *testing.T) {
	tool := tools.NewPRMerge(gitea.NewClient("http://unused", ""), allowlist.New([]string{"allowed"}))
	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"evil","name":"repo","index":1}`))
	require.Error(t, err)
}