package main

import (
	"context"
	"fmt"
	"log/slog"
	"os"
	"strings"
	"time"

	"github.com/joho/godotenv"
	"github.com/urfave/cli"

	"gitea.stevedudenhoeffer.com/steve/answer/pkg/answer"
	"gitea.stevedudenhoeffer.com/steve/answer/pkg/cache"
	"gitea.stevedudenhoeffer.com/steve/answer/pkg/search"
	gollm "gitea.stevedudenhoeffer.com/steve/go-llm"
)

func getKey(key string, env string) string {
	if key != "" {
		return key
	}

	return os.Getenv(env)
}

func main() {
	ctx := context.Background()
	// Usage: go run cmd/answer.go question...
	// - flags:
	//   --model=[model string such as openai/gpt-4o, anthropic/claude..., google/gemini-1.5.  Default: openai/gpt-4o]
	//   --search-provider=[search provider string such as google, duckduckgo.  Default: google]
	//	 --cache-provider=[cache provider string such as memory, redis, file.  Default: memory]

	var app = cli.App{
		Name:        "answer",
		Usage:       "has an llm search the web for you to answer a question",
		Version:     "0.1",
		Description: "",

		Flags: []cli.Flag{
			&cli.StringFlag{
				Name:  "env-file",
				Value: ".env",
				Usage: "file to read environment variables from",
			},

			&cli.StringFlag{
				Name:  "model",
				Value: "openai/gpt-4o",
				Usage: "model to use for answering the question, syntax: provider/model such as openai/gpt-4o",
			},

			&cli.StringFlag{
				Name:  "llm-key",
				Value: "",
				Usage: "key for the llm model (if empty, will use env var of PROVIDER_API_KEY, such as OPENAI_API_KEY)",
			},

			&cli.StringFlag{
				Name:  "search-provider",
				Value: "duckduckgo",
				Usage: "search provider to use for searching the web",
			},

			&cli.StringFlag{
				Name:  "cache-provider",
				Value: "file",
				Usage: "cache provider to use for caching search results",
			},
		},

		Action: func(c *cli.Context) error {
			// if there is no question to answer, print usage
			if c.NArg() == 0 {
				return cli.ShowAppHelp(c)
			}

			if c.String("env-file") != "" {
				_ = godotenv.Load(c.String("env-file"))
			}

			var question answer.Question

			question.Question = strings.Join(c.Args(), " ")

			switch c.String("cache-provider") {
			case "memory":
				panic("not implemented")

			case "redis":
				panic("not implemented")

			case "file":
				question.Cache = &cache.Directory{
					BaseFolder: "cache",
					MaxLife:    1 * 24 * time.Hour,
				}

			default:
				panic("unknown cache provider")
			}

			if question.Cache == nil {
				panic("cache is nil")
			}
			// wrap the cache in a hasher
			question.Cache = cache.ShaWrapper{
				Cache: question.Cache,
			}

			switch c.String("search-provider") {
			case "google":
				question.Search = search.Google{Cache: question.Cache}

			case "duckduckgo":
				var err error
				question.Search, err = search.NewDuckDuckGo(question.Cache)
				if err != nil {
					panic("failed to create duckduckgo search: " + err.Error())
				}

			default:
				panic("unknown search provider")
			}

			var llm gollm.LLM

			model := c.String("model")

			a := strings.Split(model, "/")

			if len(a) != 2 {
				panic("invalid model, expected: provider/model (such as openai/gpt-4o)")
			}

			switch a[0] {
			case "openai":
				llm = gollm.OpenAI(getKey(c.String("llm-key"), "OPENAI_API_KEY"))

			case "anthropic":
				llm = gollm.Anthropic(getKey(c.String("llm-key"), "ANTHROPI_API_KEY"))

			case "google":
				llm = gollm.Google(getKey(c.String("llm-key"), "GOOGLE_API_KEY"))

			default:
				panic("unknown model provider")
			}

			m, err := llm.ModelVersion(a[1])

			if err != nil {
				panic(err)
			}

			question.Model = m

			answers, err := answer.Answer(ctx, question)

			if err != nil {
				panic(err)
			}

			fmt.Println(fmt.Sprintf("Question: %s\nAnswer: %q", question.Question, answers))

			return nil
		},
	}

	err := app.Run(os.Args)

	if err != nil {
		slog.Error("Error: ", err)
	}
}