package openai

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	config "github.com/go-skynet/LocalAI/api/config"
	options "github.com/go-skynet/LocalAI/api/options"
	model "github.com/go-skynet/LocalAI/pkg/model"
	"github.com/gofiber/fiber/v2"
	"github.com/rs/zerolog/log"
)

func readInput(c *fiber.Ctx, o *options.Option, randomModel bool) (string, *OpenAIRequest, error) {
	loader := o.Loader
	input := new(OpenAIRequest)
	ctx, cancel := context.WithCancel(o.Context)
	input.Context = ctx
	input.Cancel = cancel
	// Get input data from the request body
	if err := c.BodyParser(input); err != nil {
		return "", nil, err
	}

	modelFile := input.Model

	if c.Params("model") != "" {
		modelFile = c.Params("model")
	}

	received, _ := json.Marshal(input)

	log.Debug().Msgf("Request received: %s", string(received))

	// Set model from bearer token, if available
	bearer := strings.TrimLeft(c.Get("authorization"), "Bearer ")
	bearerExists := bearer != "" && loader.ExistsInModelPath(bearer)

	// If no model was specified, take the first available
	if modelFile == "" && !bearerExists && randomModel {
		models, _ := loader.ListModels()
		if len(models) > 0 {
			modelFile = models[0]
			log.Debug().Msgf("No model specified, using: %s", modelFile)
		} else {
			log.Debug().Msgf("No model specified, returning error")
			return "", nil, fmt.Errorf("no model specified")
		}
	}

	// If a model is found in bearer token takes precedence
	if bearerExists {
		log.Debug().Msgf("Using model from bearer token: %s", bearer)
		modelFile = bearer
	}
	return modelFile, input, nil
}

func updateConfig(config *config.Config, input *OpenAIRequest) {
	if input.Echo {
		config.Echo = input.Echo
	}
	if input.TopK != 0 {
		config.TopK = input.TopK
	}
	if input.TopP != 0 {
		config.TopP = input.TopP
	}

	if input.NegativePromptScale != 0 {
		config.NegativePromptScale = input.NegativePromptScale
	}

	if input.NegativePrompt != "" {
		config.NegativePrompt = input.NegativePrompt
	}

	if input.RopeFreqBase != 0 {
		config.RopeFreqBase = input.RopeFreqBase
	}

	if input.RopeFreqScale != 0 {
		config.RopeFreqScale = input.RopeFreqScale
	}

	if input.Grammar != "" {
		config.Grammar = input.Grammar
	}

	if input.Temperature != 0 {
		config.Temperature = input.Temperature
	}

	if input.Maxtokens != 0 {
		config.Maxtokens = input.Maxtokens
	}

	switch stop := input.Stop.(type) {
	case string:
		if stop != "" {
			config.StopWords = append(config.StopWords, stop)
		}
	case []interface{}:
		for _, pp := range stop {
			if s, ok := pp.(string); ok {
				config.StopWords = append(config.StopWords, s)
			}
		}
	}

	if input.RepeatPenalty != 0 {
		config.RepeatPenalty = input.RepeatPenalty
	}

	if input.Keep != 0 {
		config.Keep = input.Keep
	}

	if input.Batch != 0 {
		config.Batch = input.Batch
	}

	if input.F16 {
		config.F16 = input.F16
	}

	if input.IgnoreEOS {
		config.IgnoreEOS = input.IgnoreEOS
	}

	if input.Seed != 0 {
		config.Seed = input.Seed
	}

	if input.Mirostat != 0 {
		config.Mirostat = input.Mirostat
	}

	if input.MirostatETA != 0 {
		config.MirostatETA = input.MirostatETA
	}

	if input.MirostatTAU != 0 {
		config.MirostatTAU = input.MirostatTAU
	}

	if input.TypicalP != 0 {
		config.TypicalP = input.TypicalP
	}

	switch inputs := input.Input.(type) {
	case string:
		if inputs != "" {
			config.InputStrings = append(config.InputStrings, inputs)
		}
	case []interface{}:
		for _, pp := range inputs {
			switch i := pp.(type) {
			case string:
				config.InputStrings = append(config.InputStrings, i)
			case []interface{}:
				tokens := []int{}
				for _, ii := range i {
					tokens = append(tokens, int(ii.(float64)))
				}
				config.InputToken = append(config.InputToken, tokens)
			}
		}
	}

	// Can be either a string or an object
	switch fnc := input.FunctionCall.(type) {
	case string:
		if fnc != "" {
			config.SetFunctionCallString(fnc)
		}
	case map[string]interface{}:
		var name string
		n, exists := fnc["name"]
		if exists {
			nn, e := n.(string)
			if e {
				name = nn
			}
		}
		config.SetFunctionCallNameString(name)
	}

	switch p := input.Prompt.(type) {
	case string:
		config.PromptStrings = append(config.PromptStrings, p)
	case []interface{}:
		for _, pp := range p {
			if s, ok := pp.(string); ok {
				config.PromptStrings = append(config.PromptStrings, s)
			}
		}
	}
}

func readConfig(modelFile string, input *OpenAIRequest, cm *config.ConfigLoader, loader *model.ModelLoader, debug bool, threads, ctx int, f16 bool) (*config.Config, *OpenAIRequest, error) {
	// Load a config file if present after the model name
	modelConfig := filepath.Join(loader.ModelPath, modelFile+".yaml")

	var cfg *config.Config

	defaults := func() {
		cfg = config.DefaultConfig(modelFile)
		cfg.ContextSize = ctx
		cfg.Threads = threads
		cfg.F16 = f16
		cfg.Debug = debug
	}

	cfgExisting, exists := cm.GetConfig(modelFile)
	if !exists {
		if _, err := os.Stat(modelConfig); err == nil {
			if err := cm.LoadConfig(modelConfig); err != nil {
				return nil, nil, fmt.Errorf("failed loading model config (%s) %s", modelConfig, err.Error())
			}
			cfgExisting, exists = cm.GetConfig(modelFile)
			if exists {
				cfg = &cfgExisting
			} else {
				defaults()
			}
		} else {
			defaults()
		}
	} else {
		cfg = &cfgExisting
	}

	// Set the parameters for the language model prediction
	updateConfig(cfg, input)

	// Don't allow 0 as setting
	if cfg.Threads == 0 {
		if threads != 0 {
			cfg.Threads = threads
		} else {
			cfg.Threads = 4
		}
	}

	// Enforce debug flag if passed from CLI
	if debug {
		cfg.Debug = true
	}

	return cfg, input, nil
}