package middleware

import (
	"fmt"
	"testing"

	"github.com/QuantumNous/new-api/constant"
	"github.com/QuantumNous/new-api/model"
	"github.com/QuantumNous/new-api/pkg/jsplugin"
	"github.com/QuantumNous/new-api/relaykit/dto"
	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestChannelMatchesExpectedTaskPluginUsesGenericChannelSetting(t *testing.T) {
	channel := &model.Channel{Type: constant.ChannelTypeTaskPlugin}
	channel.SetSetting(dto.ChannelSettings{TaskPluginKey: "generic-alpha"})

	assert.True(t, channelMatchesExpectedTaskPlugin(nil, channel, "generic-alpha"))
	assert.False(t, channelMatchesExpectedTaskPlugin(nil, channel, "generic-beta"))
	assert.False(t, channelMatchesExpectedTaskPlugin(nil, channel, ""))
}

func TestChannelMatchesExpectedTaskPluginUsesPinnedLegacyIndex(t *testing.T) {
	registry := jsplugin.NewRegistry()
	alpha, err := registry.Register(distributorTaskPluginSource("legacy-alpha", constant.ChannelTypeKling), jsplugin.Options{})
	require.NoError(t, err)
	pinnedGeneration := registry.Generation()

	require.NoError(t, registry.Unregister("legacy-alpha"))
	_, err = registry.Register(distributorTaskPluginSource("legacy-beta", constant.ChannelTypeKling), jsplugin.Options{})
	require.NoError(t, err)

	c, _ := gin.CreateTestContext(nil)
	c.Set(jsplugin.ContextKeyPinnedPlugin, jsplugin.PinnedPlugin{
		Generation: pinnedGeneration,
		Plugin:     alpha,
	})
	channel := &model.Channel{Type: constant.ChannelTypeKling}

	assert.True(t, channelMatchesExpectedTaskPlugin(c, channel, "legacy-alpha"))
	assert.False(t, channelMatchesExpectedTaskPlugin(c, channel, "legacy-beta"))
	assert.False(t, channelMatchesExpectedTaskPlugin(c, &model.Channel{Type: constant.ChannelTypeJimeng}, "legacy-alpha"))
}

func TestChannelMatchesExpectedTaskPluginRejectsUnindexedLegacyChannel(t *testing.T) {
	registry := jsplugin.NewRegistry()
	plugin, err := registry.Register(distributorTaskPluginSource("legacy-alpha", constant.ChannelTypeKling), jsplugin.Options{})
	require.NoError(t, err)

	c, _ := gin.CreateTestContext(nil)
	c.Set(jsplugin.ContextKeyPinnedPlugin, jsplugin.PinnedPlugin{
		Generation: registry.Generation(),
		Plugin:     plugin,
	})

	assert.False(t, channelMatchesExpectedTaskPlugin(c, &model.Channel{Type: constant.ChannelTypeJimeng}, "legacy-alpha"))
	assert.False(t, channelMatchesExpectedTaskPlugin(c, &model.Channel{Type: 0}, "legacy-alpha"))
	assert.True(t, channelMatchesExpectedTaskPlugin(c, &model.Channel{Type: constant.ChannelTypeJimeng}, ""))
	assert.False(t, channelMatchesExpectedTaskPlugin(nil, &model.Channel{Type: constant.ChannelTypeKling}, "legacy-alpha"))

	c.Set("expected_task_plugin_key", "legacy-alpha")
	setupErr := SetupContextForSelectedChannel(c, &model.Channel{Type: constant.ChannelTypeJimeng}, "task-model")
	require.NotNil(t, setupErr)
	assert.Contains(t, setupErr.Error(), "does not match")
}

func TestSharedEndpointRebindsToSelectedLegacyProvider(t *testing.T) {
	registry := jsplugin.NewRegistry()
	_, err := registry.Register(distributorEndpointPluginSource("gemini-shared", constant.ChannelTypeGemini), jsplugin.Options{})
	require.NoError(t, err)
	_, err = registry.Register(distributorEndpointPluginSource("vertex-shared", constant.ChannelTypeVertexAi), jsplugin.Options{})
	require.NoError(t, err)
	candidates := registry.Generation().LookupEndpointCandidates("POST", "/v1/responses", "task-model")
	require.Len(t, candidates, 2)

	c, _ := gin.CreateTestContext(nil)
	c.Set(jsplugin.ContextKeyPinnedPlugin, jsplugin.PinnedPlugin{Generation: registry.Generation(), Plugin: candidates[0].Plugin})
	c.Set(jsplugin.ContextKeyPinnedEndpoint, jsplugin.PinnedEndpoint{
		Generation: registry.Generation(),
		Plugin:     candidates[0].Plugin,
		Protocol:   candidates[0].Protocol,
		Operation:  candidates[0].Operation,
		Model:      "task-model",
		Candidates: candidates,
	})
	c.Set("expected_task_plugin_key", candidates[0].Plugin.Meta.Key)

	geminiChannel := &model.Channel{Id: 1, Type: constant.ChannelTypeGemini}
	vertexChannel := &model.Channel{Id: 2, Type: constant.ChannelTypeVertexAi}
	assert.True(t, channelMatchesExpectedTaskPlugin(c, geminiChannel, candidates[0].Plugin.Meta.Key))
	assert.True(t, channelMatchesExpectedTaskPlugin(c, vertexChannel, candidates[0].Plugin.Meta.Key))
	assert.False(t, channelMatchesExpectedTaskPlugin(c, &model.Channel{Type: constant.ChannelTypeKling}, candidates[0].Plugin.Meta.Key))

	require.Nil(t, SetupContextForSelectedChannel(c, vertexChannel, "task-model"))
	pinnedValue, exists := c.Get(jsplugin.ContextKeyPinnedEndpoint)
	require.True(t, exists)
	pinned, ok := pinnedValue.(jsplugin.PinnedEndpoint)
	require.True(t, ok)
	assert.Equal(t, "vertex-shared", pinned.Plugin.Meta.Key)
	assert.Equal(t, "vertex-shared", c.GetString("expected_task_plugin_key"))
	assert.Equal(t, "vertex-shared", c.GetString("task_plugin_key"))
	assert.True(t, channelMatchesExpectedTaskPlugin(c, geminiChannel, "vertex-shared"), "a retry may select another declared provider")
}

func distributorTaskPluginSource(key string, channelType int) string {
	return fmt.Sprintf(`
export const meta = {
  apiVersion: 1,
  key: %q,
  name: %q,
  version: "1.0.0",
  author: {name: "Test"},
  channelTypes: [%d],
  models: ["task-model"],
  fetchMode: "per_task",
};
export function buildSubmitRequest() { return {}; }
export function parseSubmitResponse() { return {taskId: "task"}; }
export function buildQueryRequest() { return {}; }
export function parseTaskResult() { return {status: "SUCCESS"}; }
`, key, key, channelType)
}

func distributorEndpointPluginSource(key string, channelType int) string {
	return fmt.Sprintf(`
export const meta = {
  apiVersion: 1,
  key: %q,
  name: %q,
  version: "1.0.0",
  author: {name: "Test"},
  channelTypes: [%d],
  models: ["task-model"],
  fetchMode: "per_task",
  protocols: [{name: "openai_responses", supports: ["stream", "sync", "background"]}],
};
export function buildSubmitRequest() { return {}; }
export function parseSubmitResponse() { return {taskId: "task"}; }
export function buildQueryRequest() { return {}; }
export function parseTaskResult() { return {status: "SUCCESS"}; }
export const protocols = {openai_responses: {
  decodeRequest: function(ctx) { return {kind: "submit", model: "task-model", requestBody: ctx.body.value}; },
  renderEvents: function() { return {events: [], state: null, done: false}; },
  renderFinal: function() { return {output: []}; },
}};
`, key, key, channelType)
}