package config

import (
	"os"
	"testing"

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

func TestLoad(t *testing.T) {
	// Create a temporary config file for testing
	tmpFile, err := os.CreateTemp("", "config_test_*.yaml")
	require.NoError(t, err)
	defer os.Remove(tmpFile.Name())

	// Write test config content
	configContent := `
arbitrum:
  rpc_endpoint: "${ARBITRUM_RPC_ENDPOINT}"
  ws_endpoint: "${ARBITRUM_WS_ENDPOINT}"
  chain_id: 42161
  rate_limit:
    requests_per_second: 5
    max_concurrent: 3
    burst: 10

bot:
  enabled: true
  polling_interval: 3
  min_profit_threshold: 10.0
  gas_price_multiplier: 1.2
  max_workers: 3
  channel_buffer_size: 50
  rpc_timeout: 30

uniswap:
  factory_address: "0x1F98431c8aD98523631AE4a59f267346ea31F984"
  position_manager_address: "0xC36442b4a4522E871399CD717aBDD847Ab11FE88"
  fee_tiers:
    - 500
    - 3000
    - 10000
  cache:
    enabled: true
    expiration: 300
    max_size: 10000

log:
  level: "debug"
  format: "text"
  file: "logs/mev-bot.log"

database:
  file: "mev-bot.db"
  max_open_connections: 10
  max_idle_connections: 5
`
	_, err = tmpFile.Write([]byte(configContent))
	require.NoError(t, err)
	err = tmpFile.Close()
	require.NoError(t, err)

	// Set environment variables for test
	os.Setenv("ARBITRUM_RPC_ENDPOINT", "wss://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57")
	os.Setenv("ARBITRUM_WS_ENDPOINT", "wss://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57")
	defer func() {
		os.Unsetenv("ARBITRUM_RPC_ENDPOINT")
		os.Unsetenv("ARBITRUM_WS_ENDPOINT")
	}()

	// Test loading the config
	cfg, err := Load(tmpFile.Name())
	require.NoError(t, err)

	// Verify the loaded config
	assert.Equal(t, "wss://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57", cfg.Arbitrum.RPCEndpoint)
	assert.Equal(t, "wss://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57", cfg.Arbitrum.WSEndpoint)
	assert.Equal(t, int64(42161), cfg.Arbitrum.ChainID)
	assert.Equal(t, 5, cfg.Arbitrum.RateLimit.RequestsPerSecond)
	assert.True(t, cfg.Bot.Enabled)
	assert.Equal(t, 3, cfg.Bot.PollingInterval)
	assert.Equal(t, 10.0, cfg.Bot.MinProfitThreshold)
	assert.Equal(t, "0x1F98431c8aD98523631AE4a59f267346ea31F984", cfg.Uniswap.FactoryAddress)
	assert.Len(t, cfg.Uniswap.FeeTiers, 3)
	assert.Equal(t, true, cfg.Uniswap.Cache.Enabled)
	assert.Equal(t, "debug", cfg.Log.Level)
	assert.Equal(t, "logs/mev-bot.log", cfg.Log.File)
	assert.Equal(t, "mev-bot.db", cfg.Database.File)
}

func TestLoadWithInvalidFile(t *testing.T) {
	// Test loading a non-existent config file
	_, err := Load("/non/existent/file.yaml")
	assert.Error(t, err)
}

func TestOverrideWithEnv(t *testing.T) {
	// Create a temporary config file for testing
	tmpFile, err := os.CreateTemp("", "config_test_*.yaml")
	require.NoError(t, err)
	defer os.Remove(tmpFile.Name())

	// Write test config content
	configContent := `
arbitrum:
  rpc_endpoint: "https://arb1.arbitrum.io/rpc"
  rate_limit:
    requests_per_second: 10
    max_concurrent: 5

bot:
  max_workers: 10
  channel_buffer_size: 100
`
	_, err = tmpFile.Write([]byte(configContent))
	require.NoError(t, err)
	err = tmpFile.Close()
	require.NoError(t, err)

	// Set environment variables to override config
	os.Setenv("ARBITRUM_RPC_ENDPOINT", "https://override.arbitrum.io/rpc")
	os.Setenv("RPC_REQUESTS_PER_SECOND", "20")
	os.Setenv("BOT_MAX_WORKERS", "20")
	defer func() {
		os.Unsetenv("ARBITRUM_RPC_ENDPOINT")
		os.Unsetenv("RPC_REQUESTS_PER_SECOND")
		os.Unsetenv("BOT_MAX_WORKERS")
	}()

	// Load the config
	cfg, err := Load(tmpFile.Name())
	require.NoError(t, err)

	// Verify the overridden values
	assert.Equal(t, "https://override.arbitrum.io/rpc", cfg.Arbitrum.RPCEndpoint)
	assert.Equal(t, 20, cfg.Arbitrum.RateLimit.RequestsPerSecond)
	assert.Equal(t, 20, cfg.Bot.MaxWorkers)
}