//
//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

package models

import (
	"bytes"
	"context"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

type FishAudioModel struct {
	baseModel BaseModel
}

func NewFishAudioModel(baseURL map[string]string, urlSuffix URLSuffix) *FishAudioModel {
	return &FishAudioModel{
		baseModel: BaseModel{
			BaseURL:    baseURL,
			URLSuffix:  urlSuffix,
			httpClient: NewDriverHTTPClient(),
		},
	}
}

func (f *FishAudioModel) NewInstance(baseURL map[string]string) ModelDriver {
	return NewFishAudioModel(baseURL, f.baseModel.URLSuffix)
}

func (f *FishAudioModel) Name() string {
	return "fishaudio"
}

func (f *FishAudioModel) ChatWithMessages(modelName string, messages []Message, apiConfig *APIConfig, chatModelConfig *ChatConfig) (*ChatResponse, error) {
	return nil, fmt.Errorf("%s, no such method", f.Name())
}

func (f *FishAudioModel) ChatStreamlyWithSender(modelName string, messages []Message, apiConfig *APIConfig, modelConfig *ChatConfig, sender func(*string, *string) error) error {
	return fmt.Errorf("%s, no such method", f.Name())
}

func (f *FishAudioModel) Embed(modelName *string, texts []string, apiConfig *APIConfig, embeddingConfig *EmbeddingConfig) ([]EmbeddingData, error) {
	return nil, fmt.Errorf("no such method")
}

func (f *FishAudioModel) Rerank(modelName *string, query string, documents []string, apiConfig *APIConfig, rerankConfig *RerankConfig) (*RerankResponse, error) {
	return nil, fmt.Errorf("no such method")
}

// TranscribeAudio transcribe audio
func (f *FishAudioModel) TranscribeAudio(modelName *string, file *string, apiConfig *APIConfig, asrConfig *ASRConfig) (*ASRResponse, error) {
	if err := f.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}

	if file == nil || *file == "" {
		return nil, fmt.Errorf("file is missing")
	}

	resolvedBaseURL, err := f.baseModel.GetBaseURL(apiConfig)
	if err != nil {
		return nil, err
	}
	url := fmt.Sprintf("%s/%s", resolvedBaseURL, f.baseModel.URLSuffix.ASR)

	var body bytes.Buffer
	writer := multipart.NewWriter(&body)

	// audio file
	audioFile, err := os.Open(*file)
	if err != nil {
		return nil, fmt.Errorf("failed to open audio file: %w", err)
	}
	defer audioFile.Close()

	part, err := writer.CreateFormFile("audio", filepath.Base(*file))
	if err != nil {
		return nil, fmt.Errorf("failed to create multipart file: %w", err)
	}

	if _, err = io.Copy(part, audioFile); err != nil {
		return nil, fmt.Errorf("failed to copy audio data: %w", err)
	}

	// extra params
	if asrConfig != nil && asrConfig.Params != nil {
		for key, value := range asrConfig.Params {

			var val string

			switch v := value.(type) {
			case string:
				val = v
			case bool:
				val = strconv.FormatBool(v)
			case int:
				val = strconv.Itoa(v)
			case float64:
				val = strconv.FormatFloat(v, 'f', -1, 64)
			default:
				val = fmt.Sprintf("%v", v)
			}

			if err := writer.WriteField(key, val); err != nil {
				return nil, fmt.Errorf("failed to write field %s: %w", key, err)
			}
		}
	}

	if err := writer.Close(); err != nil {
		return nil, fmt.Errorf("failed to close multipart writer: %w", err)
	}

	// request
	ctx, cancel := context.WithTimeout(context.Background(), longOpCallTimeout)
	defer cancel()

	req, err := http.NewRequestWithContext(ctx, "POST", url, &body)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
	req.Header.Set("Content-Type", writer.FormDataContentType())

	resp, err := f.baseModel.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("FishAudio ASR error: %s - %s", resp.Status, string(respBody))
	}

	// result
	var result struct {
		Text string `json:"text"`
	}

	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
	}

	return &ASRResponse{
		Text: result.Text,
	}, nil
}

func (f *FishAudioModel) TranscribeAudioWithSender(modelName *string, file *string, apiConfig *APIConfig, asrConfig *ASRConfig, sender func(*string, *string) error) error {
	return fmt.Errorf("%s, no such method", f.Name())
}

// AudioSpeech convert text to audio
func (f *FishAudioModel) AudioSpeech(modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig) (*TTSResponse, error) {
	if err := f.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}

	if audioContent == nil || *audioContent == "" {
		return nil, fmt.Errorf("text content is missing")
	}

	resolvedBaseURL, err := f.baseModel.GetBaseURL(apiConfig)
	if err != nil {
		return nil, err
	}
	url := fmt.Sprintf("%s/%s", resolvedBaseURL, f.baseModel.URLSuffix.TTS)

	reqBody := map[string]interface{}{
		"text": *audioContent,
	}

	if ttsConfig != nil && ttsConfig.Params != nil {
		for key, value := range ttsConfig.Params {
			reqBody[key] = value
		}
	}
	if ttsConfig != nil && ttsConfig.Format != "" {
		reqBody["format"] = ttsConfig.Format
	}

	jsonData, err := json.Marshal(reqBody)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), longOpCallTimeout)
	defer cancel()

	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(jsonData))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
	req.Header.Set("model", *modelName)

	resp, err := f.baseModel.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("%s - %s", resp.Status, string(body))
	}

	return &TTSResponse{Audio: body}, nil
}

func (f *FishAudioModel) AudioSpeechWithSender(modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig, sender func(*string, *string) error) error {
	if err := f.baseModel.APIConfigCheck(apiConfig); err != nil {
		return err
	}

	if audioContent == nil || *audioContent == "" {
		return fmt.Errorf("text content is missing")
	}

	resolvedBaseURL, err := f.baseModel.GetBaseURL(apiConfig)
	if err != nil {
		return err
	}
	url := fmt.Sprintf("%s/%s/%s", resolvedBaseURL, f.baseModel.URLSuffix.TTS, "stream/with-timestamp")

	reqBody := map[string]interface{}{
		"text": *audioContent,
	}

	if ttsConfig != nil && ttsConfig.Params != nil {
		for key, value := range ttsConfig.Params {
			reqBody[key] = value
		}
	}
	if ttsConfig != nil && ttsConfig.Format != "" {
		reqBody["format"] = ttsConfig.Format
	}

	jsonData, err := json.Marshal(reqBody)
	if err != nil {
		return fmt.Errorf("failed to marshal request: %w", err)
	}

	// Build Request
	ctx, cancel := context.WithTimeout(context.Background(), streamCallTimeout)
	defer cancel()

	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(jsonData))
	if err != nil {
		return fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
	req.Header.Set("model", *modelName)

	resp, err := f.baseModel.httpClient.Do(req)
	if err != nil {
		return fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		buf := make([]byte, 1024)
		n, _ := resp.Body.Read(buf)
		return fmt.Errorf("FishAudio stream API error: %d - %s", resp.StatusCode, string(buf[:n]))
	}

	if _, err := ParseSSEStream[struct {
		AudioBase64 string `json:"audio_base64"`
	}](resp.Body, func(event struct {
		AudioBase64 string `json:"audio_base64"`
	}) error {
		if event.AudioBase64 != "" {
			audioBytes, err := base64.StdEncoding.DecodeString(event.AudioBase64)
			if err == nil && len(audioBytes) > 0 {
				chunk := string(audioBytes)
				if errSend := sender(&chunk, nil); errSend != nil {
					return errSend
				}
			}
		}
		return nil
	}); err != nil {
		return fmt.Errorf("failed to scan response body: %w", err)
	}

	return nil
}

// OCRFile OCR file
func (f *FishAudioModel) OCRFile(modelName *string, content []byte, url *string, apiConfig *APIConfig, ocrConfig *OCRConfig) (*OCRFileResponse, error) {
	return nil, fmt.Errorf("%s, no such method", f.Name())
}

// ParseFile parse file
func (f *FishAudioModel) ParseFile(modelName *string, content []byte, url *string, apiConfig *APIConfig, parseFileConfig *ParseFileConfig) (*ParseFileResponse, error) {
	return nil, fmt.Errorf("%s, no such method", f.Name())
}

func (f *FishAudioModel) ListModels(apiConfig *APIConfig) ([]ListModelResponse, error) {
	if err := f.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}

	resolvedBaseURL, err := f.baseModel.GetBaseURL(apiConfig)
	if err != nil {
		return nil, err
	}
	url := fmt.Sprintf("%s/%s", resolvedBaseURL, f.baseModel.URLSuffix.Models)

	ctx, cancel := context.WithTimeout(context.Background(), nonStreamCallTimeout)
	defer cancel()

	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))

	resp, err := f.baseModel.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("Fish Audio API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	var result struct {
		Items []struct {
			ID    string `json:"_id"`
			Title string `json:"title"`
		} `json:"items"`
	}

	if err := json.Unmarshal(body, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	models := make([]ListModelResponse, 0, len(result.Items))
	for _, item := range result.Items {
		models = append(models, ListModelResponse{
			Name: item.Title,
		})
	}

	return models, nil
}

func (f *FishAudioModel) Balance(apiConfig *APIConfig) (map[string]interface{}, error) {
	if err := f.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}

	baseURL, err := f.baseModel.GetBaseURL(apiConfig)
	if err != nil {
		return nil, err
	}

	url := fmt.Sprintf("%s/wallet/self/api-credit", strings.TrimSuffix(baseURL, "/"))

	ctx, cancel := context.WithTimeout(context.Background(), nonStreamCallTimeout)
	defer cancel()

	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))

	resp, err := f.baseModel.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("Fish Audio balance API error: status %d, body: %s", resp.StatusCode, string(body))
	}

	var result map[string]interface{}
	if err := json.Unmarshal(body, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return result, nil
}

func (f *FishAudioModel) CheckConnection(apiConfig *APIConfig) error {
	_, err := f.ListModels(apiConfig)
	return err
}

func (f *FishAudioModel) ListTasks(apiConfig *APIConfig) ([]ListTaskStatus, error) {
	return nil, fmt.Errorf("%s, no such method", f.Name())
}

func (f *FishAudioModel) ShowTask(taskID string, apiConfig *APIConfig) (*TaskResponse, error) {
	return nil, fmt.Errorf("%s, no such method", f.Name())
}