import { state } from './cwb_state.js';
import { logError, showToastr, escapeHtml } from './cwb_utils.js';
import { getRequestHeaders } from '/script.js';
import { extensionName } from '../../utils/settings.js';
import { extension_settings, getContext } from "/scripts/extensions.js";

function normalizeApiResponse(responseData) {
    let data = responseData;
    if (typeof data === 'string') {
        try {
            data = JSON.parse(data);
        } catch (e) {
            console.error(`[${extensionName}] API响应JSON解析失败:`, e);
            return { error: { message: 'Invalid JSON response' } };
        }
    }
    if (data && typeof data.data === 'object' && data.data !== null && !Array.isArray(data.data)) {
        if (Object.hasOwn(data.data, 'data')) {
            data = data.data;
        }
    }
    if (data && data.choices && data.choices[0]) {
        return { content: data.choices[0].message?.content?.trim() };
    }
    if (data && data.content) {
        return { content: data.content.trim() };
    }
    if (data && data.data) { 
        return { data: data.data };
    }
    if (data && data.error) {
        return { error: data.error };
    }
    return data;
}


function getCwbApiSettings() {
    const settings = extension_settings[extensionName] || {};
    return {
        apiMode: settings.cwb_api_mode || 'openai_test',
        apiUrl: settings.cwb_api_url?.trim() || '',
        apiKey: settings.cwb_api_key?.trim() || '',
        model: settings.cwb_api_model || '',
        tavernProfile: settings.cwb_tavern_profile || '',
        temperature: settings.cwb_temperature ?? 0.7,
        maxTokens: settings.cwb_max_tokens ?? 65000
    };
}

async function callCwbSillyTavernPreset(messages, options) {
    console.log('[CWB-ST预设] 使用SillyTavern预设调用');

    if (!window.TavernHelper || !window.TavernHelper.triggerSlash) {
        throw new Error('TavernHelper不可用，无法使用SillyTavern预设模式');
    }

    const context = getContext();
    if (!context) {
        throw new Error('无法获取SillyTavern上下文');
    }

    const profileId = options.tavernProfile;
    if (!profileId) {
        throw new Error('未配置SillyTavern预设ID');
    }

    let originalProfile = '';
    let responsePromise;

    try {
        originalProfile = await window.TavernHelper.triggerSlash('/profile');
        console.log(`[CWB-ST预设] 当前配置文件: ${originalProfile}`);

        const targetProfile = context.extensionSettings?.connectionManager?.profiles?.find(p => p.id === profileId);
        if (!targetProfile) {
            throw new Error(`未找到配置文件ID: ${profileId}`);
        }

        const targetProfileName = targetProfile.name;
        console.log(`[CWB-ST预设] 目标配置文件: ${targetProfileName}`);

        const currentProfile = await window.TavernHelper.triggerSlash('/profile');
        if (currentProfile !== targetProfileName) {
            console.log(`[CWB-ST预设] 切换配置文件: ${currentProfile} -> ${targetProfileName}`);
            const escapedProfileName = targetProfileName.replace(/"/g, '\\"');
            await window.TavernHelper.triggerSlash(`/profile await=true "${escapedProfileName}"`);
        }

        if (!context.ConnectionManagerRequestService) {
            throw new Error('ConnectionManagerRequestService不可用');
        }

        console.log(`[CWB-ST预设] 通过配置文件 ${targetProfileName} 发送请求`);
        responsePromise = context.ConnectionManagerRequestService.sendRequest(
            targetProfile.id,
            messages,
            options.maxTokens || 65000
        );

    } finally {
        try {
            const currentProfileAfterCall = await window.TavernHelper.triggerSlash('/profile');
            if (originalProfile && originalProfile !== currentProfileAfterCall) {
                console.log(`[CWB-ST预设] 恢复原始配置文件: ${currentProfileAfterCall} -> ${originalProfile}`);
                const escapedOriginalProfile = originalProfile.replace(/"/g, '\\"');
                await window.TavernHelper.triggerSlash(`/profile await=true "${escapedOriginalProfile}"`);
            }
        } catch (restoreError) {
            console.error('[CWB-ST预设] 恢复配置文件失败:', restoreError);
        }
    }

    const result = await responsePromise;

    if (!result) {
        throw new Error('未收到API响应');
    }

    const normalizedResult = normalizeApiResponse(result);
    if (normalizedResult.error) {
        throw new Error(normalizedResult.error.message || 'SillyTavern预设API调用失败');
    }

    return normalizedResult.content;
}

async function callCwbOpenAITest(messages, options) {
    // 参数验证
    if (!Array.isArray(messages) || messages.length === 0) {
        throw new Error('消息数组不能为空');
    }
    
    if (!options?.apiUrl?.trim()) {
        throw new Error('API URL 不能为空');
    }

    if (!options?.model?.trim()) {
        throw new Error('模型名称不能为空');
    }

    // 确保所有必需的参数都存在且有效
    const validatedOptions = {
        maxTokens: Math.max(1, parseInt(options.maxTokens ?? 65000)),
        temperature: Math.max(0, Math.min(2, parseFloat(options.temperature ?? 1))),
        top_p: Math.max(0, Math.min(1, parseFloat(options.top_p ?? 1))),
        apiUrl: options.apiUrl.trim(),
        apiKey: (options.apiKey || '').trim(),
        model: options.model.trim()
    };

    // 验证消息格式
    const validatedMessages = messages.map((msg, index) => {
        if (!msg || typeof msg !== 'object') {
            throw new Error(`消息 ${index} 格式无效`);
        }
        if (!msg.role || !['system', 'user', 'assistant'].includes(msg.role)) {
            throw new Error(`消息 ${index} 的角色无效`);
        }
        if (!msg.content || typeof msg.content !== 'string') {
            throw new Error(`消息 ${index} 的内容无效`);
        }
        return {
            role: msg.role,
            content: msg.content.trim()
        };
    });

    const requestBody = {
        chat_completion_source: 'openai',
        custom_prompt_post_processing: 'strict',
        enable_web_search: false,
        frequency_penalty: 0,
        group_names: [],
        include_reasoning: false,
        max_tokens: validatedOptions.maxTokens,
        messages: validatedMessages,
        model: validatedOptions.model,
        presence_penalty: 0.12,
        proxy_password: validatedOptions.apiKey,
        reasoning_effort: 'medium',
        request_images: false,
        reverse_proxy: validatedOptions.apiUrl,
        stream: false,
        temperature: validatedOptions.temperature,
        top_p: validatedOptions.top_p
    };

    try {
        const response = await fetch('/api/backends/chat-completions/generate', {
            method: 'POST',
            headers: { 
                ...getRequestHeaders(), 
                'Content-Type': 'application/json',
                'Accept': 'application/json'
            },
            body: JSON.stringify(requestBody)
        });

        if (!response.ok) {
            let errorText;
            try {
                errorText = await response.text();
            } catch (e) {
                errorText = '无法读取错误响应';
            }
            
            // 根据HTTP状态码提供更具体的错误信息
            let errorMessage = `CWB OpenAI Test API请求失败 (${response.status})`;
            if (response.status === 400) {
                errorMessage += ': 请求格式错误，请检查参数配置';
            } else if (response.status === 401) {
                errorMessage += ': 认证失败，请检查API密钥';
            } else if (response.status === 403) {
                errorMessage += ': 访问被拒绝，请检查权限设置';
            } else if (response.status === 429) {
                errorMessage += ': 请求频率超限，请稍后重试';
            } else if (response.status >= 500) {
                errorMessage += ': 服务器错误，请稍后重试';
            }
            errorMessage += errorText ? ` - ${errorText}` : '';
            
            throw new Error(errorMessage);
        }

        let responseData;
        try {
            responseData = await response.json();
        } catch (e) {
            throw new Error('API返回的响应不是有效的JSON格式');
        }

        // 使用标准化响应处理
        const normalizedResponse = normalizeApiResponse(responseData);
        
        if (normalizedResponse.error) {
            throw new Error(normalizedResponse.error.message || 'API返回错误响应');
        }

        if (normalizedResponse.content) {
            return normalizedResponse.content;
        }

        // 兼容直接响应格式
        if (responseData?.choices?.[0]?.message?.content) {
            return responseData.choices[0].message.content.trim();
        }

        throw new Error('API响应格式不正确或未包含有效内容');

    } catch (error) {
        if (error.name === 'TypeError' && error.message.includes('fetch')) {
            throw new Error('网络连接失败，请检查网络状态');
        }
        throw error;
    }
}

export async function callCwbAPI(systemPrompt, userPromptContent, options = {}) {
    const apiSettings = getCwbApiSettings();
    
    const finalOptions = {
        maxTokens: apiSettings.maxTokens,
        temperature: apiSettings.temperature,
        model: apiSettings.model,
        apiUrl: apiSettings.apiUrl,
        apiKey: apiSettings.apiKey,
        apiMode: apiSettings.apiMode,
        tavernProfile: apiSettings.tavernProfile,
        ...options
    };

    if (finalOptions.apiMode !== 'sillytavern_preset') {
        if (!finalOptions.apiUrl || !finalOptions.model || !finalOptions.apiKey) {
            throw new Error('API配置不完整，请检查URL、Key和模型配置');
        }
    } else {
        if (!finalOptions.tavernProfile) {
            throw new Error('未配置SillyTavern预设ID');
        }
    }

    const combinedSystemPrompt = `${state.currentBreakArmorPrompt}\n\n${systemPrompt}`;

    const messages = [
        { role: 'system', content: combinedSystemPrompt },
        { role: 'user', content: userPromptContent },
    ];

    console.groupCollapsed(`[CWB] 统一API调用 @ ${new Date().toLocaleTimeString()}`);
    console.log("【请求参数】:", { 
        mode: finalOptions.apiMode,
        model: finalOptions.model, 
        maxTokens: finalOptions.maxTokens, 
        temperature: finalOptions.temperature,
        messagesCount: messages.length
    });
    console.log("【消息内容】:", messages);

    try {
        let responseContent;

        switch (finalOptions.apiMode) {
            case 'openai_test':
                responseContent = await callCwbOpenAITest(messages, finalOptions);
                break;
            case 'sillytavern_preset':
                responseContent = await callCwbSillyTavernPreset(messages, finalOptions);
                break;
            default:
                throw new Error(`未支持的API模式: ${finalOptions.apiMode}`);
        }

        if (!responseContent) {
            throw new Error('未能获取AI响应内容');
        }

        console.log("【AI回复】:", responseContent);
        console.groupEnd();

        return responseContent.trim();

    } catch (error) {
        console.error(`[CWB] API调用发生错误:`, error);
        console.groupEnd();
        throw error;
    }
}

export async function loadModels($panel) {
    const apiSettings = getCwbApiSettings();
    const $modelSelect = $panel.find('#cwb-api-model');
    const $apiStatus = $panel.find('#cwb-api-status');

    $apiStatus.text('状态: 正在加载模型列表...').css('color', '#61afef');
    showToastr('info', '正在加载模型列表...');

    try {
        let models = [];

        if (apiSettings.apiMode === 'sillytavern_preset') {
            const context = getContext();
            if (!context?.extensionSettings?.connectionManager?.profiles) {
                throw new Error('无法获取SillyTavern配置文件列表');
            }
            
            const targetProfile = context.extensionSettings.connectionManager.profiles.find(p => p.id === apiSettings.tavernProfile);
            if (!targetProfile) {
                throw new Error(`未找到配置文件ID: ${apiSettings.tavernProfile}`);
            }
            
            if (targetProfile.openai_model) {
                models.push({ id: targetProfile.openai_model, name: targetProfile.openai_model });
            }
            
            if (models.length === 0) {
                throw new Error('当前预设未配置模型');
            }
            
        } else {
            if (!apiSettings.apiUrl || !apiSettings.apiKey) {
                throw new Error('API URL或Key未配置');
            }
            
            const response = await fetch('/api/backends/chat-completions/status', {
                method: 'POST',
                headers: {
                    ...getRequestHeaders(),
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    reverse_proxy: apiSettings.apiUrl,
                    proxy_password: apiSettings.apiKey,
                    chat_completion_source: 'openai'
                })
            });

            if (!response.ok) {
                const errorText = await response.text();
                throw new Error(`HTTP ${response.status}: ${errorText}`);
            }

            const rawData = await response.json();
            const modelList = Array.isArray(rawData) ? rawData : (rawData.data || rawData.models || []);

            if (!Array.isArray(modelList)) {
                const errorMessage = 'API未返回有效的模型列表数组';
                throw new Error(errorMessage);
            }

            models = modelList
                .map(m => {
                    const modelIdRaw = m.name || m.id || m.model || m;
                    const modelName = String(modelIdRaw).replace(/^models\//, '');
                    return {
                        id: modelName,
                        name: modelName
                    };
                })
                .filter(m => m.id)
                .sort((a, b) => String(a.name).localeCompare(String(b.name)));
        }

        $modelSelect.empty();
        if (models.length > 0) {
            models.forEach(model => {
                $modelSelect.append(jQuery('<option>', { value: model.id, text: model.name }));
            });
            showToastr('success', `成功加载 ${models.length} 个模型！`);
        } else {
            showToastr('warning', 'API未返回任何可用模型。');
        }

    } catch (error) {
        logError('加载模型列表时出错:', error);
        showToastr('error', `加载模型列表失败: ${error.message}`);
    } finally {
        updateApiStatusDisplay($panel);
    }
}

export async function fetchCwbModels() {
    console.log('[CWB] 开始获取模型列表');
    
    const apiSettings = getCwbApiSettings();
    
    try {
        if (apiSettings.apiMode === 'sillytavern_preset') {
            const context = getContext();
            if (!context?.extensionSettings?.connectionManager?.profiles) {
                throw new Error('无法获取SillyTavern配置文件列表');
            }
            
            const targetProfile = context.extensionSettings.connectionManager.profiles.find(p => p.id === apiSettings.tavernProfile);
            if (!targetProfile) {
                throw new Error(`未找到配置文件ID: ${apiSettings.tavernProfile}`);
            }
            
            const models = [];
            if (targetProfile.openai_model) {
                models.push({ id: targetProfile.openai_model, name: targetProfile.openai_model });
            }
            
            if (models.length === 0) {
                throw new Error('当前预设未配置模型');
            }
            
            console.log('[CWB] SillyTavern预设模式获取到模型:', models);
            return models;
            
        } else {
            if (!apiSettings.apiUrl || !apiSettings.apiKey) {
                throw new Error('API URL或Key未配置');
            }
            
            const response = await fetch('/api/backends/chat-completions/status', {
                method: 'POST',
                headers: {
                    ...getRequestHeaders(),
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    reverse_proxy: apiSettings.apiUrl,
                    proxy_password: apiSettings.apiKey,
                    chat_completion_source: 'openai'
                })
            });

            if (!response.ok) {
                throw new Error(`HTTP ${response.status}: ${response.statusText}`);
            }

            const rawData = await response.json();
            const models = Array.isArray(rawData) ? rawData : (rawData.data || rawData.models || []);

            if (!Array.isArray(models)) {
                const errorMessage = 'API未返回有效的模型列表数组';
                throw new Error(errorMessage);
            }

            const formattedModels = models
                .map(m => {
                    const modelIdRaw = m.name || m.id || m.model || m;
                    const modelName = String(modelIdRaw).replace(/^models\//, '');
                    return {
                        id: modelName,
                        name: modelName
                    };
                })
                .filter(m => m.id)
                .sort((a, b) => String(a.name).localeCompare(String(b.name)));

            console.log('[CWB] 全兼容模式获取到模型:', formattedModels);
            return formattedModels;
        }
    } catch (error) {
        console.error('[CWB] 获取模型列表失败:', error);
        throw error;
    }
}

// 简单的测试连接函数 - 基于 JqyhApi.js 模式
export async function testCwbConnection() {
    console.log('[CWB] 开始API连接测试');
    
    const apiSettings = getCwbApiSettings();
    
    if (!apiSettings.apiUrl || !apiSettings.apiKey || !apiSettings.model) {
        showToastr('error', 'API配置不完整，请检查URL、Key和模型', 'CWB API连接测试失败');
        return false;
    }

    try {
        showToastr('info', '正在发送测试消息"你好！"...', 'CWB API连接测试');
        
        const response = await callCwbAPI('你是一个有用的AI助手。', '你好！');
        
        if (response && response.trim()) {
            console.log('[CWB] 测试消息响应:', response);
            showToastr('success', `连接测试成功！AI回复: "${response.substring(0, 50)}${response.length > 50 ? '...' : ''}"`, 'CWB API连接测试成功');
            return true;
        } else {
            throw new Error('API未返回有效响应');
        }
        
    } catch (error) {
        console.error('[CWB] 连接测试失败:', error);
        showToastr('error', `连接测试失败: ${error.message}`, 'CWB API连接测试失败');
        return false;
    }
}

export async function fetchModelsAndConnect($panel) {
    const apiSettings = getCwbApiSettings();
    const $modelSelect = $panel.find('#cwb-api-model');
    const $apiStatus = $panel.find('#cwb-api-status');

    if (apiSettings.apiMode === 'sillytavern_preset') {
        if (!apiSettings.tavernProfile) {
            showToastr('warning', '请先选择SillyTavern预设。');
            $apiStatus.text('状态: 请先选择SillyTavern预设').css('color', 'orange');
            return;
        }
    } else {
        const apiUrl = $panel.find('#cwb-api-url').val().trim();
        if (!apiUrl) {
            showToastr('warning', '请输入API基础URL。');
            $apiStatus.text('状态:请输入API基础URL').css('color', 'orange');
            return;
        }
    }

    $apiStatus.text('状态: 正在加载模型列表...').css('color', '#61afef');
    showToastr('info', '正在加载模型列表...');

    try {
        const models = await fetchCwbModels();
        
        $modelSelect.empty();
        if (models.length > 0) {
            models.forEach(model => {
                $modelSelect.append(jQuery('<option>', { value: model.id, text: model.name }));
            });
            showToastr('success', `成功加载 ${models.length} 个模型！`);
        } else {
            showToastr('warning', 'API未返回任何可用模型。');
        }

    } catch (error) {
        logError('加载模型列表时出错:', error);
        showToastr('error', `加载模型列表失败: ${error.message}`);
    } finally {
        updateApiStatusDisplay($panel);
    }
}


export function updateApiStatusDisplay($panel) {
    if (!$panel) return;
    const $apiStatus = $panel.find('#cwb-api-status');
    const apiSettings = getCwbApiSettings();
    
    if (apiSettings.apiMode === 'sillytavern_preset') {
        if (apiSettings.tavernProfile) {
            $apiStatus.html(
                `模式: <span style="color:lightgreen;">SillyTavern预设</span><br>预设ID: <span style="color:lightgreen;">${escapeHtml(apiSettings.tavernProfile)}</span>`
            );
        } else {
            $apiStatus.html(
                `模式: SillyTavern预设 - <span style="color:orange;">请选择预设</span>`
            );
        }
    } else {
        if (apiSettings.apiUrl && apiSettings.model) {
            $apiStatus.html(
                `模式: <span style="color:lightgreen;">全兼容</span><br>URL: <span style="color:lightgreen;word-break:break-all;">${escapeHtml(apiSettings.apiUrl)}</span><br>模型: <span style="color:lightgreen;">${escapeHtml(apiSettings.model)}</span>`
            );
        } else if (apiSettings.apiUrl) {
            $apiStatus.html(
                `模式: 全兼容<br>URL: ${escapeHtml(apiSettings.apiUrl)} - <span style="color:orange;">请加载并选择模型</span>`
            );
        } else {
            $apiStatus.html(
                `模式: 全兼容 - <span style="color:#ffcc80;">请配置API URL</span>`
            );
        }
    }
}

export async function callCustomOpenAI(systemPrompt, userPromptContent) {
    const apiSettings = getCwbApiSettings();

    if (apiSettings.apiMode === 'sillytavern_preset') {
        const combinedSystemPrompt = `${state.currentBreakArmorPrompt}\n\n${systemPrompt}`;
        const messages = [
            { role: 'system', content: combinedSystemPrompt },
            { role: 'user', content: userPromptContent },
        ];
        return await callCwbSillyTavernPreset(messages, { tavernProfile: apiSettings.tavernProfile, maxTokens: 65000 });
    } else {
        if (!state.customApiConfig.url || !state.customApiConfig.model) {
            throw new Error('API URL/Model未配置。');
        }

        const combinedSystemPrompt = `${state.currentBreakArmorPrompt}\n\n${systemPrompt}`;

        const requestBody = {
            messages: [
                { role: 'system', content: combinedSystemPrompt },
                { role: 'user', content: userPromptContent },
            ],
            model: state.customApiConfig.model,
            temperature: 1,
            frequency_penalty: 0,
            presence_penalty: 0.12,
            top_p: 1,
            max_tokens: 65000,
            stream: false,
            chat_completion_source: 'openai',
            group_names: [],
            include_reasoning: false,
            reasoning_effort: 'medium',
            enable_web_search: false,
            request_images: false,
            custom_prompt_post_processing: 'strict',
            reverse_proxy: state.customApiConfig.url,
            proxy_password: state.customApiConfig.apiKey,
        };

        const fullApiUrl = '/api/backends/chat-completions/generate';
        const headers = { ...getRequestHeaders(), 'Content-Type': 'application/json' };
        const body = JSON.stringify(requestBody);

        console.groupCollapsed(`[CWB] API Call @ ${new Date().toLocaleTimeString()}`);
        console.log('Request URL:', fullApiUrl);
        console.log('Request Headers:', headers);
        console.log('Request Body:', requestBody);

        try {
            const response = await fetch(fullApiUrl, {
                method: 'POST',
                headers: headers,
                body: body,
            });

            if (!response.ok) {
                const errTxt = await response.text();
                console.error('API Error Response:', errTxt);
                throw new Error(`API请求失败: ${response.status} ${errTxt}`);
            }
            const data = await response.json();
            console.log('API Full Response:', data);
            
            if (data.choices && data.choices[0]?.message?.content) {
                console.log('Extracted Content:', data.choices[0].message.content.trim());
                console.groupEnd();
                return data.choices[0].message.content.trim();
            }
            
            throw new Error('API响应格式不正确。');

        } catch (error) {
            console.error('API Call Failed:', error);
            throw error;
        } finally {
            if (console.groupEnd) { 
                 console.groupEnd();
            }
        }
    }
}
export class CWBApiService {
    static async callAPI(systemPrompt, userPromptContent, options = {}) {
        return await callCwbAPI(systemPrompt, userPromptContent, options);
    }

    static getSettings() {
        return getCwbApiSettings();
    }

    static async loadModels($panel) {
        return await loadModels($panel);
    }
}