//
//  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/json"
	"fmt"
	"io"
	"net/http"
	"ragflow/internal/common"
	"strings"
	"time"
)

type JieKouAIModel struct {
	baseModel BaseModel
}

func NewJieKouAIModel(baseURL map[string]string, urlSuffix URLSuffix) *JieKouAIModel {
	// JieKouAI's methods issue requests without a per-call context deadline, so
	// keep an explicit 120s client-level timeout to bound them. Built on the
	// shared transport via NewDriverHTTPClient.
	client := NewDriverHTTPClient(false)
	client.Timeout = 120 * time.Second
	return &JieKouAIModel{
		baseModel: BaseModel{
			BaseURL:    baseURL,
			URLSuffix:  urlSuffix,
			httpClient: client,
		},
	}
}

func (j *JieKouAIModel) NewInstance(baseURL map[string]string) ModelDriver {
	return NewJieKouAIModel(baseURL, j.baseModel.URLSuffix)
}

func (j *JieKouAIModel) Name() string {
	return "jiekouai"
}

func validateJieKouAIModelName(modelName *string) (string, error) {
	if modelName == nil || strings.TrimSpace(*modelName) == "" {
		return "", fmt.Errorf("model name is required")
	}
	return strings.TrimSpace(*modelName), nil
}

// JieKouAIChatResponse mirrors Jiekou.AI's OpenAI-compatible chat response.
type JieKouAIChatResponse struct {
	ID      string `json:"id"`
	Object  string `json:"object"`
	Created int64  `json:"created"`
	Model   string `json:"model"`
	Choices []struct {
		FinishReason string `json:"finish_reason"`
		Index        int    `json:"index"`
		Logprobs     any    `json:"logprobs"`
		Message      struct {
			Content          string           `json:"content"`
			Reasoning        string           `json:"reasoning"`
			ReasoningContent string           `json:"reasoning_content"`
			Role             string           `json:"role"`
			ToolCalls        []map[string]any `json:"tool_calls"`
		} `json:"message"`
	} `json:"choices"`
	SystemFingerprint string `json:"system_fingerprint"`
	Usage             struct {
		CompletionTokens int `json:"completion_tokens"`
		PromptTokens     int `json:"prompt_tokens"`
		TotalTokens      int `json:"total_tokens"`
	} `json:"usage"`
}

// JieKouAIEmbeddingResponse mirrors Jiekou.AI's embeddings response.
type JieKouAIEmbeddingResponse struct {
	ID     string `json:"id"`
	Object string `json:"object"`
	Model  string `json:"model"`
	Data   []struct {
		Object    string    `json:"object"`
		Embedding []float64 `json:"embedding"`
		Index     int       `json:"index"`
	} `json:"data"`
	Usage struct {
		PromptTokens     int `json:"prompt_tokens"`
		CompletionTokens int `json:"completion_tokens"`
		TotalTokens      int `json:"total_tokens"`
	} `json:"usage"`
}

// JieKouAIRerankResponse mirrors Jiekou.AI's rerank response.
type JieKouAIRerankResponse struct {
	ID      string `json:"id"`
	Model   string `json:"model"`
	Results []struct {
		Index    int `json:"index"`
		Document struct {
			Text string `json:"text"`
		} `json:"document"`
		RelevanceScore float64 `json:"relevance_score"`
	} `json:"results"`
	Usage struct {
		PromptTokens     int `json:"prompt_tokens"`
		CompletionTokens int `json:"completion_tokens"`
		TotalTokens      int `json:"total_tokens"`
	} `json:"usage"`
}

func (j *JieKouAIModel) ChatWithMessages(ctx context.Context, modelName string, messages []Message, apiConfig *APIConfig, chatModelConfig *ChatConfig, modelUsage *common.ModelUsage) (*ChatResponse, error) {
	if err := j.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}
	apiKey := strings.TrimSpace(*apiConfig.ApiKey)
	if modelName = strings.TrimSpace(modelName); modelName == "" {
		return nil, fmt.Errorf("model name is required")
	}
	if len(messages) == 0 {
		return nil, fmt.Errorf("messages is empty")
	}

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

	// Build request body
	reqBody := buildRequestBody(chatModelConfig, modelName, messages, false)

	if chatModelConfig != nil {
		// For zai-org/glm-4.5: https://docs.jiekou.ai/docs/models/reference-llm-create-chat-completion
		if chatModelConfig.Thinking != nil {
			reqBody["enable_thinking"] = *chatModelConfig.Thinking
		}
	}

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

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

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, 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", apiKey))
	req.Header.Set("Accept", "application/json")

	resp, err := j.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: %w", err)
	}

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

	return parseChatCompletionResponse(body, chatModelConfig, modelUsage, func(body []byte, chatConfig *ChatConfig) (chatResponseParts, error) {
		var result JieKouAIChatResponse
		if err := json.Unmarshal(body, &result); err != nil {
			return chatResponseParts{}, fmt.Errorf("failed to parse response: %w", err)
		}
		if len(result.Choices) == 0 {
			return chatResponseParts{}, fmt.Errorf("no choices in response")
		}

		choice := result.Choices[0]
		if choice.Message.Content == "" && len(choice.Message.ToolCalls) == 0 {
			return chatResponseParts{}, fmt.Errorf("response contains neither content nor tool calls")
		}
		reasonContent := ""
		if chatConfig != nil && chatConfig.Thinking != nil && *chatConfig.Thinking {
			reasonContent = choice.Message.ReasoningContent
			if reasonContent == "" {
				reasonContent = choice.Message.Reasoning
			}
			reasonContent = strings.TrimPrefix(reasonContent, "\n")
		}
		return chatResponseParts{
			RequestID:     result.ID,
			Content:       &choice.Message.Content,
			ReasonContent: &reasonContent,
			ToolCalls:     choice.Message.ToolCalls,
			Usage: &TokenUsage{
				PromptTokens:     result.Usage.PromptTokens,
				CompletionTokens: result.Usage.CompletionTokens,
				TotalTokens:      result.Usage.TotalTokens,
			},
		}, nil
	})
}

func (j *JieKouAIModel) ChatStreamlyWithSender(ctx context.Context, modelName string, messages []Message, apiConfig *APIConfig, modelConfig *ChatConfig, modelUsage *common.ModelUsage, sender func(*string, *string) error) error {
	if err := j.baseModel.APIConfigCheck(apiConfig); err != nil {
		return err
	}
	apiKey := strings.TrimSpace(*apiConfig.ApiKey)
	if modelName = strings.TrimSpace(modelName); modelName == "" {
		return fmt.Errorf("model name is required")
	}
	if sender == nil {
		return fmt.Errorf("sender is required")
	}
	if len(messages) == 0 {
		return fmt.Errorf("messages is empty")
	}
	if modelConfig != nil {
		modelConfig.ToolCallsResult = nil
		modelConfig.UsageResult = nil
	}

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

	// Build request body with streaming enabled
	reqBody := buildRequestBody(modelConfig, modelName, messages, true)
	reqBody["stream_options"] = map[string]any{"include_usage": true}

	if modelConfig != nil {
		if modelConfig.Thinking != nil {
			reqBody["enable_thinking"] = *modelConfig.Thinking
		}
	}

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

	ctx, cancel := context.WithTimeout(ctx, streamCallTimeout)
	defer cancel()

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, 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", apiKey))
	req.Header.Set("Accept", "text/event-stream")

	resp, err := j.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 {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	sawTerminal := false
	accumulatedToolCalls := make(map[int]map[string]any)
	done, err := ParseSSEStream[map[string]any](resp.Body, func(event map[string]any) error {
		common.Info(fmt.Sprintf("%v", event))

		tokenUsage, found, usageErr := decodeOpenAICompatibleStreamUsage(event)
		if usageErr != nil {
			return usageErr
		}
		if found {
			applyStreamUsage(modelConfig, modelUsage, tokenUsage)
		}
		choices, ok := event["choices"].([]any)
		if !ok || len(choices) == 0 {
			return nil
		}

		choice, ok := choices[0].(map[string]any)
		if !ok {
			return nil
		}
		if finishReason, ok := choice["finish_reason"].(string); ok && finishReason != "" {
			sawTerminal = true
		}
		delta, ok := choice["delta"].(map[string]any)
		if !ok {
			return nil
		}

		accumulateToolCallDeltas(delta, accumulatedToolCalls)

		reasoningContent, ok := delta["reasoning_content"].(string)
		if ok && reasoningContent != "" {
			if err := sender(nil, &reasoningContent); err != nil {
				return err
			}
		}

		content, ok := delta["content"].(string)
		if ok && content != "" {
			if err := sender(&content, nil); err != nil {
				return err
			}
		}

		return nil
	})
	if err != nil {
		return fmt.Errorf("failed to scan response body: %w", err)
	}
	if !done && !sawTerminal {
		return fmt.Errorf("jiekouai: stream ended before [DONE] or finish_reason")
	}
	setSortedToolCallsResult(modelConfig, accumulatedToolCalls)

	// Send [DONE] marker for OpenAI compatibility
	endOfStream := "[DONE]"
	if err = sender(&endOfStream, nil); err != nil {
		return err
	}

	return nil
}

func (j *JieKouAIModel) Embed(ctx context.Context, modelName *string, texts []string, apiConfig *APIConfig, embeddingConfig *EmbeddingConfig, modelUsage *common.ModelUsage) ([]EmbeddingData, error) {
	if err := j.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}

	if len(texts) == 0 {
		return []EmbeddingData{}, fmt.Errorf("texts is empty")
	}
	model, err := validateJieKouAIModelName(modelName)
	if err != nil {
		return nil, err
	}
	apiKey := strings.TrimSpace(*apiConfig.ApiKey)

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

	reqBody := map[string]interface{}{
		"model": model,
		"input": texts,
	}

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

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

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, 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", apiKey))

	resp, err := j.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("API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	var parsedResponse JieKouAIEmbeddingResponse

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

	if len(parsedResponse.Data) == 0 {
		return nil, fmt.Errorf("failed to parse response")
	}
	recordResponseUsage(modelUsage, parsedResponse.ID, &TokenUsage{
		PromptTokens:     parsedResponse.Usage.PromptTokens,
		CompletionTokens: parsedResponse.Usage.CompletionTokens,
		TotalTokens:      parsedResponse.Usage.TotalTokens,
	}, "embedding")

	var embeddings []EmbeddingData
	for _, embedding := range parsedResponse.Data {
		embeddings = append(embeddings, EmbeddingData{
			Embedding: embedding.Embedding,
			Index:     embedding.Index,
		})
	}

	return embeddings, nil
}

func (j *JieKouAIModel) Rerank(ctx context.Context, modelName *string, query string, documents []string, apiConfig *APIConfig, rerankConfig *RerankConfig, modelUsage *common.ModelUsage) (*RerankResponse, error) {
	if err := j.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}

	if len(documents) == 0 {
		return &RerankResponse{}, nil
	}
	if strings.TrimSpace(query) == "" {
		return nil, fmt.Errorf("query is required")
	}
	model, err := validateJieKouAIModelName(modelName)
	if err != nil {
		return nil, err
	}
	apiKey := strings.TrimSpace(*apiConfig.ApiKey)

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

	reqBody := map[string]interface{}{
		"model":     model,
		"query":     strings.TrimSpace(query),
		"documents": documents,
	}
	if rerankConfig != nil && rerankConfig.TopN != 0 {
		reqBody["top_n"] = rerankConfig.TopN
	}

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

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

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, 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", apiKey))

	resp, err := j.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("API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	var rerankResp JieKouAIRerankResponse

	if err = json.Unmarshal(body, &rerankResp); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}
	recordResponseUsage(modelUsage, rerankResp.ID, &TokenUsage{
		PromptTokens:     rerankResp.Usage.PromptTokens,
		CompletionTokens: rerankResp.Usage.CompletionTokens,
		TotalTokens:      rerankResp.Usage.TotalTokens,
	}, "rerank")

	var rerankResponse RerankResponse
	for _, result := range rerankResp.Results {
		rerankResult := RerankResult{
			Index:          result.Index,
			RelevanceScore: result.RelevanceScore,
		}
		rerankResponse.Data = append(rerankResponse.Data, rerankResult)
	}

	return &rerankResponse, nil
}

func (j *JieKouAIModel) TranscribeAudio(ctx context.Context, modelName *string, file *string, apiConfig *APIConfig, asrConfig *ASRConfig, modelUsage *common.ModelUsage) (*ASRResponse, error) {
	return nil, fmt.Errorf("%s, no such method", j.Name())
}

func (j *JieKouAIModel) TranscribeAudioWithSender(ctx context.Context, modelName *string, file *string, apiConfig *APIConfig, asrConfig *ASRConfig, modelUsage *common.ModelUsage, sender func(*string, *string) error) error {
	return fmt.Errorf("%s, no such method", j.Name())
}

func (j *JieKouAIModel) AudioSpeech(ctx context.Context, modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig, modelUsage *common.ModelUsage) (*TTSResponse, error) {
	return nil, fmt.Errorf("%s, no such method", j.Name())
}

func (j *JieKouAIModel) AudioSpeechWithSender(ctx context.Context, modelName *string, audioContent *string, apiConfig *APIConfig, ttsConfig *TTSConfig, modelUsage *common.ModelUsage, sender func(*string, *string) error) error {
	return fmt.Errorf("%s, no such method", j.Name())
}

func (j *JieKouAIModel) OCRFile(ctx context.Context, modelName *string, content []byte, url *string, apiConfig *APIConfig, ocrConfig *OCRConfig, modelUsage *common.ModelUsage) (*OCRFileResponse, error) {
	return nil, fmt.Errorf("%s, no such method", j.Name())
}

func (j *JieKouAIModel) ParseFile(ctx context.Context, modelName *string, content []byte, url *string, apiConfig *APIConfig, parseFileConfig *ParseFileConfig, modelUsage *common.ModelUsage) (*ParseFileResponse, error) {
	return nil, fmt.Errorf("%s, no such method", j.Name())
}

func (j *JieKouAIModel) ListModels(ctx context.Context, apiConfig *APIConfig) ([]ListModelResponse, error) {
	if err := j.baseModel.APIConfigCheck(apiConfig); err != nil {
		return nil, err
	}
	apiKey := strings.TrimSpace(*apiConfig.ApiKey)

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

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

	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", apiKey))
	req.Header.Set("Accept", "application/json")

	resp, err := j.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("API request failed with status %d: %s", resp.StatusCode, string(body))
	}

	var result struct {
		Data []ModelListItem `json:"data"`
	}
	if err = json.Unmarshal(body, &result); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}
	if result.Data == nil {
		return nil, fmt.Errorf("models response missing data")
	}

	for idx, model := range result.Data {
		model.ID = strings.TrimSpace(model.ID)
		if model.ID == "" {
			return nil, fmt.Errorf("models response contains empty id")
		}
		result.Data[idx] = model
	}

	return ParseListModel(ModelList{Models: result.Data}), nil
}

func (j *JieKouAIModel) Balance(ctx context.Context, apiConfig *APIConfig) (map[string]interface{}, error) {
	return nil, fmt.Errorf("%s, no such method", j.Name())
}

func (j *JieKouAIModel) CheckConnection(ctx context.Context, apiConfig *APIConfig) error {
	_, err := j.ListModels(ctx, apiConfig)
	return err
}

func (j *JieKouAIModel) ListTasks(ctx context.Context, apiConfig *APIConfig) ([]ListTaskStatus, error) {
	return nil, fmt.Errorf("%s no such method", j.Name())
}

func (j *JieKouAIModel) ShowTask(ctx context.Context, taskID string, apiConfig *APIConfig) (*TaskResponse, error) {
	return nil, fmt.Errorf("%s no such method", j.Name())
}
