// SPDX-License-Identifier: EUPL-1.2

package main

import (
	"bytes"
	"flag"

	"dappco.re/go/agent/pkg/agentic"
	"dappco.re/go/core"
	coremcp "forge.lthn.ai/core/mcp/pkg/mcp"
)

type applicationCommandSet struct {
	coreApp *core.Core
}

// args := startupArgs()
// _ = c.Cli().Run("version")
func startupArgs() []string {
	previous := flag.CommandLine
	commandLine := flag.NewFlagSet("core-agent", flag.ContinueOnError)
	commandLine.SetOutput(&bytes.Buffer{})
	commandLine.BoolFunc("quiet", "", func(string) error {
		core.SetLevel(core.LevelError)
		return nil
	})
	commandLine.BoolFunc("q", "", func(string) error {
		core.SetLevel(core.LevelError)
		return nil
	})
	commandLine.BoolFunc("debug", "", func(string) error {
		core.SetLevel(core.LevelDebug)
		return nil
	})
	commandLine.BoolFunc("d", "", func(string) error {
		core.SetLevel(core.LevelDebug)
		return nil
	})

	flag.CommandLine = commandLine
	defer func() {
		flag.CommandLine = previous
	}()

	flag.Parse()
	return applyLogLevel(commandLine.Args())
}

// args := applyLogLevel([]string{"version", "-q"})
// args := applyLogLevel([]string{"--debug", "mcp"})
func applyLogLevel(args []string) []string {
	var cleaned []string
	for _, arg := range args {
		switch arg {
		case "--quiet", "-q":
			core.SetLevel(core.LevelError)
		case "--debug", "-d":
			core.SetLevel(core.LevelDebug)
		default:
			cleaned = append(cleaned, arg)
		}
	}
	return cleaned
}

// c.Command("version", core.Command{Description: "Print version and build info", Action: commands.version})
// c.Command("check", core.Command{Description: "Verify workspace, deps, and config", Action: commands.check})
// c.Command("env", core.Command{Description: "Show all core.Env() keys and values", Action: commands.env})
func registerApplicationCommands(c *core.Core) {
	commands := applicationCommandSet{coreApp: c}

	c.Command("version", core.Command{
		Description: "Print version and build info",
		Action:      commands.version,
	})

	c.Command("check", core.Command{
		Description: "Verify workspace, deps, and config",
		Action:      commands.check,
	})

	c.Command("env", core.Command{
		Description: "Show all core.Env() keys and values",
		Action:      commands.env,
	})

	c.Command("mcp", core.Command{
		Description: "Start the MCP server on stdio",
		Action:      commands.mcp,
	})

	c.Command("serve", core.Command{
		Description: "Start the MCP server over HTTP",
		Action:      commands.serve,
	})
}

func (commands applicationCommandSet) version(_ core.Options) core.Result {
	core.Print(nil, "core-agent %s", commands.coreApp.App().Version)
	core.Print(nil, "  go:       %s", core.Env("GO"))
	core.Print(nil, "  os:       %s/%s", core.Env("OS"), core.Env("ARCH"))
	core.Print(nil, "  home:     %s", agentic.HomeDir())
	core.Print(nil, "  hostname: %s", core.Env("HOSTNAME"))
	core.Print(nil, "  pid:      %s", core.Env("PID"))
	core.Print(nil, "  channel:  %s", updateChannel())
	return core.Result{OK: true}
}

func (commands applicationCommandSet) check(_ core.Options) core.Result {
	fs := commands.coreApp.Fs()
	core.Print(nil, "core-agent %s health check", commands.coreApp.App().Version)
	core.Print(nil, "")
	core.Print(nil, "  binary:    core-agent")

	agentsPath := core.JoinPath(agentic.CoreRoot(), "agents.yaml")
	if fs.IsFile(agentsPath) {
		core.Print(nil, "  agents:    %s (ok)", agentsPath)
	} else {
		core.Print(nil, "  agents:    %s (MISSING)", agentsPath)
	}

	workspaceRoot := agentic.WorkspaceRoot()
	if fs.IsDir(workspaceRoot) {
		statusFiles := agentic.WorkspaceStatusPaths()
		core.Print(nil, "  workspace: %s (%d workspaces)", workspaceRoot, len(statusFiles))
	} else {
		core.Print(nil, "  workspace: %s (MISSING)", workspaceRoot)
	}

	core.Print(nil, "  services:  %d registered", len(commands.coreApp.Services()))
	core.Print(nil, "  actions:   %d registered", len(commands.coreApp.Actions()))
	core.Print(nil, "  commands:  %d registered", len(commands.coreApp.Commands()))
	core.Print(nil, "  env keys:  %d loaded", len(core.EnvKeys()))
	core.Print(nil, "")
	core.Print(nil, "ok")
	return core.Result{OK: true}
}

func (commands applicationCommandSet) env(_ core.Options) core.Result {
	keys := core.EnvKeys()
	for _, key := range keys {
		core.Print(nil, "  %-15s %s", key, core.Env(key))
	}
	return core.Result{OK: true}
}

func (commands applicationCommandSet) mcp(_ core.Options) core.Result {
	service, err := commands.mcpService()
	if err != nil {
		return core.Result{Value: err, OK: false}
	}
	if err := service.ServeStdio(commands.coreApp.Context()); err != nil {
		return core.Result{Value: core.E("main.mcp", "serve mcp stdio", err), OK: false}
	}
	return core.Result{OK: true}
}

func (commands applicationCommandSet) serve(options core.Options) core.Result {
	service, err := commands.mcpService()
	if err != nil {
		return core.Result{Value: err, OK: false}
	}
	if err := service.ServeHTTP(commands.coreApp.Context(), commands.serveAddress(options)); err != nil {
		return core.Result{Value: core.E("main.serve", "serve mcp http", err), OK: false}
	}
	return core.Result{OK: true}
}

func (commands applicationCommandSet) mcpService() (*coremcp.Service, error) {
	if commands.coreApp == nil {
		return nil, core.E("main.mcpService", "core is required", nil)
	}

	result := commands.coreApp.Service("mcp")
	if !result.OK {
		return nil, core.E("main.mcpService", "mcp service not registered", nil)
	}

	service, ok := result.Value.(*coremcp.Service)
	if !ok || service == nil {
		return nil, core.E("main.mcpService", "mcp service has invalid type", nil)
	}

	return service, nil
}

func (commands applicationCommandSet) serveAddress(options core.Options) string {
	address := options.String("addr")
	if address == "" {
		address = options.String("_arg")
	}
	if address == "" {
		address = core.Env("CORE_AGENT_HTTP_ADDR")
	}
	if address == "" {
		address = coremcp.DefaultHTTPAddr
	}
	return address
}