// Copyright 2026 Arctel.net
// SPDX-License-Identifier: Apache-2.0

package extpoints_test

import (
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"Wavelet/core/extpoints"
)

// fakeSource is an in-memory extpoints.ConfigSource used by configuration engine tests.
type fakeSource struct {
	values map[string]any
	env    map[string]string
}

func newFakeSource() *fakeSource {
	return &fakeSource{values: map[string]any{}, env: map[string]string{}}
}

func (f *fakeSource) Lookup(path string) (any, bool) {
	v, ok := f.values[path]
	return v, ok
}

func (f *fakeSource) LookupEnv(name string) (string, bool) {
	v, ok := f.env[name]
	return v, ok
}

func (f *fakeSource) Describe() string { return "fake" }

// redisConfig mirrors how a plugin declares the configuration it reads.
type redisConfig struct {
	Enabled   bool          `config:"enabled" env:"REDIS_ENABLED" default:"false" autoEnable:"REDIS_ADDR"`
	Addrs     []string      `config:"addrs" env:"REDIS_ADDR"`
	DB        int           `config:"db" env:"REDIS_DB"`
	KeyPrefix string        `config:"key_prefix" env:"REDIS_KEY_PREFIX"`
	Dial      time.Duration `config:"dial_timeout" env:"REDIS_DIAL_TIMEOUT"`
	Ignored   string        `config:"-"`
	private   string
}

func TestDeclareRegistersTaggedLeafKeys(t *testing.T) {
	r := extpoints.NewConfigRegistry(newFakeSource())

	require.NoError(t, r.Declare("cache", extpoints.ConfigBinding{Prefix: "redis", Target: &redisConfig{}}))

	keys := make([]string, 0)
	for _, e := range r.Entries() {
		keys = append(keys, e.Key)
	}
	assert.Equal(t, []string{
		"redis.addrs", "redis.db", "redis.dial_timeout", "redis.enabled", "redis.key_prefix",
	}, keys)
}

func TestDeclareRejectsNonStructPointerTarget(t *testing.T) {
	r := extpoints.NewConfigRegistry(newFakeSource())

	assert.ErrorIs(t, r.Declare("cache", extpoints.ConfigBinding{Prefix: "redis", Target: redisConfig{}}),
		extpoints.ErrConfigTarget)
	assert.ErrorIs(t, r.Declare("cache", extpoints.ConfigBinding{Prefix: "redis", Target: (*redisConfig)(nil)}),
		extpoints.ErrConfigTarget)
}

func TestDeclareAllowsIdenticalDuplicateAndRejectsConflictingMetadata(t *testing.T) {
	r := extpoints.NewConfigRegistry(newFakeSource())
	binding := extpoints.ConfigBinding{Prefix: "redis", Target: &redisConfig{}}
	require.NoError(t, r.Declare("cache", binding))
	require.NoError(t, r.Declare("cache_memory", binding), "identical shared declarations must be allowed")

	type conflictingConfig struct {
		Enabled bool `config:"enabled" env:"REDIS_ON" default:"true"`
	}
	err := r.Declare("driver_http", extpoints.ConfigBinding{Prefix: "redis", Target: &conflictingConfig{}})
	require.ErrorIs(t, err, extpoints.ErrConfigConflict)
	assert.Contains(t, err.Error(), "redis.enabled")
	assert.Contains(t, err.Error(), "cache")
	assert.Contains(t, err.Error(), "driver_http")
}