package main

import (
	"net/http"
	"net/http/httptest"
	"slices"
	"strconv"
	"testing"

	"hakurei.app/internal/info"
	"hakurei.app/internal/rosa"
)

// prefix is prepended to every API path.
const prefix = "/api/" + ApiVersion + "/"

func TestAPIInfo(t *testing.T) {
	t.Parallel()

	w := httptest.NewRecorder()
	handleInfo(w, httptest.NewRequestWithContext(
		t.Context(),
		http.MethodGet,
		prefix+"info",
		nil,
	))

	resp := w.Result()
	checkStatus(t, resp, http.StatusOK)
	checkAPIHeader(t, w.Header())

	checkPayload(t, resp, struct {
		Count          int    `json:"count"`
		HakureiVersion string `json:"hakurei_version"`
	}{int(rosa.PresetUnexportedStart), info.Version()})
}

func TestAPIGet(t *testing.T) {
	t.Parallel()
	const target = prefix + "get"

	index := newIndex(t)
	newRequest := func(suffix string) *httptest.ResponseRecorder {
		w := httptest.NewRecorder()
		index.handleGet(w, httptest.NewRequestWithContext(
			t.Context(),
			http.MethodGet,
			target+suffix,
			nil,
		))
		return w
	}

	checkValidate := func(t *testing.T, suffix string, vmin, vmax int, wantErr string) {
		t.Run("invalid", func(t *testing.T) {
			t.Parallel()

			w := newRequest("?" + suffix + "=invalid")
			resp := w.Result()
			checkError(t, resp, wantErr, http.StatusBadRequest)
		})

		t.Run("min", func(t *testing.T) {
			t.Parallel()

			w := newRequest("?" + suffix + "=" + strconv.Itoa(vmin-1))
			resp := w.Result()
			checkError(t, resp, wantErr, http.StatusBadRequest)

			w = newRequest("?" + suffix + "=" + strconv.Itoa(vmin))
			resp = w.Result()
			checkStatus(t, resp, http.StatusOK)
		})

		t.Run("max", func(t *testing.T) {
			t.Parallel()

			w := newRequest("?" + suffix + "=" + strconv.Itoa(vmax+1))
			resp := w.Result()
			checkError(t, resp, wantErr, http.StatusBadRequest)

			w = newRequest("?" + suffix + "=" + strconv.Itoa(vmax))
			resp = w.Result()
			checkStatus(t, resp, http.StatusOK)
		})
	}

	t.Run("limit", func(t *testing.T) {
		t.Parallel()
		checkValidate(
			t, "index=0&sort=0&limit", 1, 100,
			"limit must be an integer between 1 and 100",
		)
	})

	t.Run("index", func(t *testing.T) {
		t.Parallel()
		checkValidate(
			t, "limit=1&sort=0&index", 0, int(rosa.PresetUnexportedStart-1),
			"index must be an integer between 0 and "+strconv.Itoa(int(rosa.PresetUnexportedStart-1)),
		)
	})

	t.Run("sort", func(t *testing.T) {
		t.Parallel()
		checkValidate(
			t, "index=0&limit=1&sort", 0, int(sortOrderEnd),
			"sort must be an integer between 0 and "+strconv.Itoa(int(sortOrderEnd)),
		)
	})

	checkWithSuffix := func(name, suffix string, want []*metadata) {
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			w := newRequest(suffix)
			resp := w.Result()
			checkStatus(t, resp, http.StatusOK)
			checkAPIHeader(t, w.Header())
			checkPayloadFunc(t, resp, func(got *struct {
				Count  int         `json:"count"`
				Values []*metadata `json:"values"`
			}) bool {
				return got.Count == len(want) &&
					slices.EqualFunc(got.Values, want, func(a, b *metadata) bool {
						return (a.Version == b.Version ||
							a.Version == rosa.Unversioned ||
							b.Version == rosa.Unversioned) &&
							a.HasReport == b.HasReport &&
							a.Name == b.Name &&
							a.Description == b.Description &&
							a.Website == b.Website
					})
			})

		})
	}

	checkWithSuffix("declarationAscending", "?limit=2&index=0&sort=0", []*metadata{
		{
			Metadata: rosa.GetMetadata(0),
			Version:  rosa.Std.Version(0),
		},
		{
			Metadata: rosa.GetMetadata(1),
			Version:  rosa.Std.Version(1),
		},
	})
	checkWithSuffix("declarationAscending offset", "?limit=3&index=5&sort=0", []*metadata{
		{
			Metadata: rosa.GetMetadata(5),
			Version:  rosa.Std.Version(5),
		},
		{
			Metadata: rosa.GetMetadata(6),
			Version:  rosa.Std.Version(6),
		},
		{
			Metadata: rosa.GetMetadata(7),
			Version:  rosa.Std.Version(7),
		},
	})
	checkWithSuffix("declarationDescending", "?limit=3&index=0&sort=1", []*metadata{
		{
			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 1),
			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 1),
		},
		{
			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 2),
			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 2),
		},
		{
			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 3),
			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 3),
		},
	})
	checkWithSuffix("declarationDescending offset", "?limit=1&index=37&sort=1", []*metadata{
		{
			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 38),
			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 38),
		},
	})
}