package cmd

import (
	"fmt"
	"slices"
	"strings"

	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
	"git.mlow.ca/mlow/lmcli/pkg/util"
	"github.com/spf13/cobra"
)

func RootCmd(ctx *lmcli.Context) *cobra.Command {
	var root = &cobra.Command{
		Use:           "lmcli <command> [flags]",
		Long:          `lmcli - Large Language Model CLI`,
		SilenceErrors: true,
		SilenceUsage:  true,
		Run: func(cmd *cobra.Command, args []string) {
			cmd.Usage()
		},
	}

	root.AddCommand(
		ChatCmd(ctx),
		ContinueCmd(ctx),
		CloneCmd(ctx),
		EditCmd(ctx),
		ListCmd(ctx),
		NewCmd(ctx),
		PromptCmd(ctx),
		RenameCmd(ctx),
		ReplyCmd(ctx),
		RetryCmd(ctx),
		RemoveCmd(ctx),
		ViewCmd(ctx),
	)

	return root
}

func applyGenerationFlags(ctx *lmcli.Context, cmd *cobra.Command) {
	f := cmd.Flags()

	// -m, --model
	f.StringVarP(
		ctx.Config.Defaults.Model, "model", "m",
		*ctx.Config.Defaults.Model, "Which model to generate a response with",
	)
	cmd.RegisterFlagCompletionFunc("model", func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
		return ctx.GetModels(), cobra.ShellCompDirectiveDefault
	})

	// -a, --agent
	f.StringVarP(&ctx.Config.Defaults.Agent, "agent", "a", ctx.Config.Defaults.Agent, "Which agent to interact with")
	cmd.RegisterFlagCompletionFunc("agent", func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
		return ctx.GetAgents(), cobra.ShellCompDirectiveDefault
	})

	// --max-length
	f.IntVar(ctx.Config.Defaults.MaxTokens, "max-length", *ctx.Config.Defaults.MaxTokens, "Maximum response tokens")
	// --temperature
	f.Float32VarP(ctx.Config.Defaults.Temperature, "temperature", "t", *ctx.Config.Defaults.Temperature, "Sampling temperature")

	// --system-prompt
	f.StringVar(&ctx.Config.Defaults.SystemPrompt, "system-prompt", ctx.Config.Defaults.SystemPrompt, "System prompt")
	// --system-prompt-file
	f.StringVar(&ctx.Config.Defaults.SystemPromptFile, "system-prompt-file", ctx.Config.Defaults.SystemPromptFile, "A path to a file containing the system prompt")
	cmd.MarkFlagsMutuallyExclusive("system-prompt", "system-prompt-file")
}

func validateGenerationFlags(ctx *lmcli.Context, cmd *cobra.Command) error {
	f := cmd.Flags()
	model, err := f.GetString("model")
	if err != nil {
		return fmt.Errorf("Error parsing --model: %w", err)
	}
	if model != "" && !slices.Contains(ctx.GetModels(), model) {
		return fmt.Errorf("Unknown model: %s", model)
	}

	agent, err := f.GetString("agent")
	if err != nil {
		return fmt.Errorf("Error parsing --agent: %w", err)
	}
	if agent != "" && agent != "none"  && !slices.Contains(ctx.GetAgents(), agent) {
		return fmt.Errorf("Unknown agent: %s", agent)
	}
	return nil
}

// inputFromArgsOrEditor returns either the provided input from the args slice
// (joined with spaces), or if len(args) is 0, opens an editor and returns
// whatever input was provided there. placeholder is a string which populates
// the editor and gets stripped from the final output.
func inputFromArgsOrEditor(args []string, placeholder string, existingMessage string) (message string) {
	var err error
	if len(args) == 0 {
		message, err = util.InputFromEditor(placeholder, "message.*.md", existingMessage)
		if err != nil {
			lmcli.Fatal("Failed to get input: %v\n", err)
		}
	} else {
		message = strings.Join(args, " ")
	}
	message = strings.Trim(message, " \t\n")
	return
}