package agent

import (
	"context"
	"strings"
	"time"
)

type Option func(*options) error
type llmOptions struct {
	APIURL string
	APIKey string
	Model  string
}

type options struct {
	LLMAPI                                  llmOptions
	character                               Character
	randomIdentityGuidance                  string
	randomIdentity                          bool
	userActions                             Actions
	enableHUD, standaloneJob, showCharacter bool
	debugMode                               bool
	initiateConversations                   bool
	characterfile                           string
	statefile                               string
	context                                 context.Context
	permanentGoal                           string
	periodicRuns                            time.Duration

	// callbacks
	reasoningCallback func(ActionCurrentState) bool
	resultCallback    func(ActionState)
}

func defaultOptions() *options {
	return &options{
		periodicRuns: 15 * time.Minute,
		LLMAPI: llmOptions{
			APIURL: "http://localhost:8080",
			Model:  "echidna",
		},
		character: Character{
			Name:       "John Doe",
			Age:        0,
			Occupation: "Unemployed",
			Hobbies:    []string{},
			MusicTaste: []string{},
		},
	}
}

func newOptions(opts ...Option) (*options, error) {
	options := defaultOptions()
	for _, o := range opts {
		if err := o(options); err != nil {
			return nil, err
		}
	}
	return options, nil
}

var EnableHUD = func(o *options) error {
	o.enableHUD = true
	return nil
}

var EnableInitiateConversations = func(o *options) error {
	o.initiateConversations = true
	return nil
}

var DebugMode = func(o *options) error {
	o.debugMode = true
	return nil
}

// EnableStandaloneJob is an option to enable the agent
// to run jobs in the background automatically
var EnableStandaloneJob = func(o *options) error {
	o.standaloneJob = true
	return nil
}

var EnablePersonality = func(o *options) error {
	o.showCharacter = true
	return nil
}

func WithLLMAPIURL(url string) Option {
	return func(o *options) error {
		o.LLMAPI.APIURL = url
		return nil
	}
}

func WithLLMAPIKey(key string) Option {
	return func(o *options) error {
		o.LLMAPI.APIKey = key
		return nil
	}
}

func WithPermanentGoal(goal string) Option {
	return func(o *options) error {
		o.permanentGoal = goal
		return nil
	}
}

func WithPeriodicRuns(duration string) Option {
	return func(o *options) error {
		t, err := time.ParseDuration(duration)
		if err != nil {
			o.periodicRuns, _ = time.ParseDuration("1m")
		}
		o.periodicRuns = t
		return nil
	}
}

func WithContext(ctx context.Context) Option {
	return func(o *options) error {
		o.context = ctx
		return nil
	}
}

func WithAgentReasoningCallback(cb func(ActionCurrentState) bool) Option {
	return func(o *options) error {
		o.reasoningCallback = cb
		return nil
	}
}

func WithAgentResultCallback(cb func(ActionState)) Option {
	return func(o *options) error {
		o.resultCallback = cb
		return nil
	}
}

func WithModel(model string) Option {
	return func(o *options) error {
		o.LLMAPI.Model = model
		return nil
	}
}

func WithCharacter(c Character) Option {
	return func(o *options) error {
		o.character = c
		return nil
	}
}

func FromFile(path string) Option {
	return func(o *options) error {
		c, err := Load(path)
		if err != nil {
			return err
		}
		o.character = *c
		return nil
	}
}

func WithRandomIdentity(guidance ...string) Option {
	return func(o *options) error {
		o.randomIdentityGuidance = strings.Join(guidance, "")
		o.randomIdentity = true
		o.showCharacter = true
		return nil
	}
}

func WithActions(actions ...Action) Option {
	return func(o *options) error {
		o.userActions = actions
		return nil
	}
}