package mining

import (
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"os/exec"
	"strings"
)

// Start launches the TT-Miner with the given configuration.
func (m *TTMiner) Start(config *Config) error {
	m.mu.Lock()
	defer m.mu.Unlock()

	if m.Running {
		return errors.New("miner is already running")
	}

	// If the binary path isn't set, run CheckInstallation to find it.
	if m.MinerBinary == "" {
		if _, err := m.CheckInstallation(); err != nil {
			return err // Propagate the detailed error from CheckInstallation
		}
	}

	if m.API != nil && config.HTTPPort != 0 {
		m.API.ListenPort = config.HTTPPort
	} else if m.API != nil && m.API.ListenPort == 0 {
		return errors.New("miner API port not assigned")
	}

	// Build command line arguments for TT-Miner
	args := m.buildArgs(config)

	log.Printf("Executing TT-Miner command: %s %s", m.MinerBinary, strings.Join(args, " "))

	m.cmd = exec.Command(m.MinerBinary, args...)

	// Create stdin pipe for console commands
	stdinPipe, err := m.cmd.StdinPipe()
	if err != nil {
		return fmt.Errorf("failed to create stdin pipe: %w", err)
	}
	m.stdinPipe = stdinPipe

	// Always capture output to LogBuffer
	if m.LogBuffer != nil {
		m.cmd.Stdout = m.LogBuffer
		m.cmd.Stderr = m.LogBuffer
	}
	// Also output to console if requested
	if config.LogOutput {
		m.cmd.Stdout = io.MultiWriter(m.LogBuffer, os.Stdout)
		m.cmd.Stderr = io.MultiWriter(m.LogBuffer, os.Stderr)
	}

	if err := m.cmd.Start(); err != nil {
		return fmt.Errorf("failed to start TT-Miner: %w", err)
	}

	m.Running = true

	// Monitor the process in a goroutine
	go func() {
		err := m.cmd.Wait()
		m.mu.Lock()
		m.Running = false
		m.mu.Unlock()
		if err != nil {
			log.Printf("TT-Miner exited with error: %v", err)
		} else {
			log.Printf("TT-Miner exited normally")
		}
	}()

	return nil
}

// buildArgs constructs the command line arguments for TT-Miner
func (m *TTMiner) buildArgs(config *Config) []string {
	var args []string

	// Pool configuration
	if config.Pool != "" {
		args = append(args, "-P", config.Pool)
	}

	// Wallet/user configuration
	if config.Wallet != "" {
		args = append(args, "-u", config.Wallet)
	}

	// Password
	if config.Password != "" {
		args = append(args, "-p", config.Password)
	} else {
		args = append(args, "-p", "x")
	}

	// Algorithm selection
	if config.Algo != "" {
		args = append(args, "-a", config.Algo)
	}

	// API binding for stats collection
	if m.API != nil && m.API.Enabled {
		args = append(args, "-b", fmt.Sprintf("%s:%d", m.API.ListenHost, m.API.ListenPort))
	}

	// GPU device selection (if specified)
	if config.Devices != "" {
		args = append(args, "-d", config.Devices)
	}

	// Intensity (if specified)
	if config.Intensity > 0 {
		args = append(args, "-i", fmt.Sprintf("%d", config.Intensity))
	}

	// Additional CLI arguments
	addTTMinerCliArgs(config, &args)

	return args
}

// addTTMinerCliArgs adds any additional CLI arguments from config
func addTTMinerCliArgs(config *Config, args *[]string) {
	// Add any extra arguments passed via CLIArgs
	if config.CLIArgs != "" {
		extraArgs := strings.Fields(config.CLIArgs)
		*args = append(*args, extraArgs...)
	}
}