'use strict';

const plagiarismCheckService = require('../utils/plagiarismCheckService');
const { recordAiQueryLog } = require('../utils/aiUsage');

const toInt = (value, defaultValue = null) => {
   const parsed = Number.parseInt(String(value), 10);
   return Number.isFinite(parsed) ? parsed : defaultValue;
};

const getErrorMessage = (error, fallback) =>
   typeof error === 'string' ? error : (error?.message || fallback);

const normalizeTaskUserId = (ctx) => {
   const body = ctx.request.body || {};
   return toInt(body.userId || body.externalUserId || ctx.state?.externalUserId || ctx.state?.user?.id);
};

module.exports.createTask = async (ctx) => {
   try {
      const data = await plagiarismCheckService.createTask(ctx);
      try {
         await recordAiQueryLog(ctx, {
            userId: normalizeTaskUserId(ctx),
            ipAddress: String(ctx.request.body?.curIp || '').trim() || null,
            feature: '文档查重',
         });
      } catch (error) {
         ctx.logger?.log?.(error);
      }
      ctx.status = 200;
      ctx.body = {
         message: '提交成功',
         data,
      };
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '提交查重任务失败') };
   }
};

module.exports.getTaskDetail = async (ctx) => {
   try {
      const { models } = ctx.app.fs.dc;
      const taskId = toInt(ctx.params.taskId);
      if (!taskId) throw new Error('缺少参数: taskId');
      const task = await models.PlagiarismCheckTasks.findByPk(taskId, {
         include: [
            {
               model: models.PlagiarismCheckFiles,
               required: false,
               include: [
                  {
                     model: models.PlagiarismCheckDocTypes,
                     required: false,
                  },
                  {
                     model: models.PlagiarismCheckFileSummaries,
                     required: false,
                  },
               ],
            },
            {
               model: models.PlagiarismCheckFileSummaries,
               required: false,
            },
         ],
         order: [[models.PlagiarismCheckFiles, 'sortOrder', 'ASC']],
      });
      if (!task) throw new Error('查重任务不存在');
      ctx.status = 200;
      ctx.body = task;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '获取查重任务失败') };
   }
};

module.exports.getFileBlocks = async (ctx) => {
   try {
      const { models } = ctx.app.fs.dc;
      const taskId = toInt(ctx.params.taskId);
      const fileId = toInt(ctx.params.fileId);
      if (!taskId) throw new Error('缺少参数: taskId');
      if (!fileId) throw new Error('缺少参数: fileId');
      const page = Math.max(toInt(ctx.request.query.page, 1), 1);
      const pageSize = Math.min(Math.max(toInt(ctx.request.query.pageSize, 200), 1), 1000);
      const file = await models.PlagiarismCheckFiles.findOne({
         where: { id: fileId, taskId },
         raw: true,
      });
      if (!file) throw new Error('文件不存在或不属于当前任务');
      const result = await models.PlagiarismCheckFileBlocks.findAndCountAll({
         where: { taskId, fileId },
         order: [['blockIndex', 'ASC']],
         offset: (page - 1) * pageSize,
         limit: pageSize,
      });
      ctx.status = 200;
      ctx.body = {
         count: result.count,
         rows: result.rows.map(plagiarismCheckService.buildEditableBlockResponse),
         page,
         pageSize,
      };
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '获取解析块失败') };
   }
};

module.exports.updateFileBlock = async (ctx) => {
   try {
      const taskId = toInt(ctx.params.taskId);
      const fileId = toInt(ctx.params.fileId);
      const blockId = toInt(ctx.params.blockId);
      if (!taskId) throw new Error('缺少参数: taskId');
      if (!fileId) throw new Error('缺少参数: fileId');
      if (!blockId) throw new Error('缺少参数: blockId');

      const body = ctx.request.body || {};
      const result = await plagiarismCheckService.updateBlockContent(ctx, {
         taskId,
         fileId,
         blockId,
         htmlContent: body.htmlContent,
         plainText: body.plainText,
         editSource: body.editSource,
      });
      ctx.status = 200;
      ctx.body = result;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '保存解析块失败') };
   }
};

module.exports.deduplicateFileBlock = async (ctx) => {
   try {
      const taskId = toInt(ctx.params.taskId);
      const fileId = toInt(ctx.params.fileId);
      const blockId = toInt(ctx.params.blockId);
      if (!taskId) throw new Error('缺少参数: taskId');
      if (!fileId) throw new Error('缺少参数: fileId');
      if (!blockId) throw new Error('缺少参数: blockId');

      const body = ctx.request.body || {};
      const result = await plagiarismCheckService.generateDeduplicatedBlock(ctx, {
         taskId,
         fileId,
         blockId,
         htmlContent: body.htmlContent,
         plainText: body.plainText,
         prompt: body.prompt,
      });
      ctx.status = 200;
      ctx.body = result;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '块内容降重失败') };
   }
};

module.exports.deleteFileBlock = async (ctx) => {
   try {
      const taskId = toInt(ctx.params.taskId);
      const fileId = toInt(ctx.params.fileId);
      const blockId = toInt(ctx.params.blockId);
      if (!taskId) throw new Error('缺少参数: taskId');
      if (!fileId) throw new Error('缺少参数: fileId');
      if (!blockId) throw new Error('缺少参数: blockId');

      await plagiarismCheckService.deleteFileBlock(ctx, {
         taskId,
         fileId,
         blockId,
      });
      ctx.status = 204;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '删除解析块失败') };
   }
};

module.exports.exportTaskFileDocx = async (ctx) => {
   try {
      const taskId = toInt(ctx.params.taskId);
      const fileId = toInt(ctx.params.fileId);
      if (!taskId) throw new Error('缺少参数: taskId');
      if (!fileId) throw new Error('缺少参数: fileId');

      const result = await plagiarismCheckService.exportTaskFileDocx(ctx, {
         taskId,
         fileId,
      });
      ctx.set('Content-Type', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document');
      ctx.set('Content-Disposition', `attachment; filename="${encodeURIComponent(result.fileName)}"`);
      ctx.body = result.buffer;
      ctx.status = 200;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '导出文档失败') };
   }
};

module.exports.updateTaskThreshold = async (ctx) => {
   try {
      const taskId = toInt(ctx.params.taskId);
      if (!taskId) throw new Error('缺少参数: taskId');

      const body = ctx.request.body || {};
      const data = await plagiarismCheckService.updateTaskThreshold(ctx, {
         taskId,
         threshold: body.threshold,
      });
      ctx.status = 200;
      ctx.body = {
         message: '阈值更新成功',
         data,
      };
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '更新查重阈值失败') };
   }
};

module.exports.getTaskMatches = async (ctx) => {
   try {
      const { models, ORM: { Op } } = ctx.app.fs.dc;
      const taskId = toInt(ctx.params.taskId);
      if (!taskId) throw new Error('缺少参数: taskId');
      const page = Math.max(toInt(ctx.request.query.page, 1), 1);
      const pageSize = Math.min(Math.max(toInt(ctx.request.query.pageSize, 200), 1), 1000);
      const where = { taskId };
      const fileId = toInt(ctx.request.query.fileId);
      const leftFileId = toInt(ctx.request.query.leftFileId);
      const rightFileId = toInt(ctx.request.query.rightFileId);
      const matchType = String(ctx.request.query.matchType || '').trim();
      if (fileId) where[Op.or] = [{ leftFileId: fileId }, { rightFileId: fileId }];
      if (leftFileId) where.leftFileId = leftFileId;
      if (rightFileId) where.rightFileId = rightFileId;
      if (matchType) {
         where.matchType = matchType === 'red'
            ? 'same_type'
            : (matchType === 'yellow' ? 'cross_type' : matchType);
      }
      const result = await models.PlagiarismCheckMatches.findAndCountAll({
         where,
         order: [['id', 'ASC']],
         offset: (page - 1) * pageSize,
         limit: pageSize,
      });
      ctx.status = 200;
      ctx.body = {
         count: result.count,
         rows: result.rows,
         page,
         pageSize,
      };
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '获取查重结果失败') };
   }
};

module.exports.getTaskResult = async (ctx) => {
   try {
      const { models } = ctx.app.fs.dc;
      const taskId = toInt(ctx.params.taskId);
      if (!taskId) throw new Error('缺少参数: taskId');
      const task = await models.PlagiarismCheckTasks.findByPk(taskId, { raw: true });
      if (!task) throw new Error('查重任务不存在');
      const files = await models.PlagiarismCheckFiles.findAll({
         where: { taskId },
         order: [['sortOrder', 'ASC'], ['id', 'ASC']],
         raw: true,
      });
      const summaries = await models.PlagiarismCheckFileSummaries.findAll({
         where: { taskId },
         order: [['fileId', 'ASC']],
         raw: true,
      });
      const matches = await models.PlagiarismCheckMatches.findAll({
         where: { taskId },
         order: [['id', 'ASC']],
         raw: true,
      });
      const fileIndexMap = new Map(files.map((file, index) => [Number(file.id), index]));
      const mockMatches = matches.map((match, index) => ({
         id: `m-${index}`,
         dbId: match.id,
         leftFileId: match.leftFileId,
         rightFileId: match.rightFileId,
         leftBlockId: match.leftBlockId,
         rightBlockId: match.rightBlockId,
         leftIdx: fileIndexMap.get(Number(match.leftFileId)) ?? 0,
         rightIdx: fileIndexMap.get(Number(match.rightFileId)) ?? 0,
         leftPara: match.leftBlockIndex,
         rightPara: match.rightBlockIndex,
         len: match.matchLength,
         matchType: match.color,
         matchText: match.matchText,
         leftStart: match.leftStart,
         leftEnd: match.leftEnd,
         rightStart: match.rightStart,
         rightEnd: match.rightEnd,
         leftRawStart: match.leftRawStart,
         leftRawEnd: match.leftRawEnd,
         rightRawStart: match.rightRawStart,
         rightRawEnd: match.rightRawEnd,
      }));
      ctx.status = 200;
      ctx.body = {
         task,
         files,
         summaries,
         matches: mockMatches,
      };
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '获取查重汇总失败') };
   }
};

module.exports.rerunTaskCheck = async (ctx) => {
   try {
      const taskId = toInt(ctx.params.taskId);
      if (!taskId) throw new Error('缺少参数: taskId');
      const result = await plagiarismCheckService.runPlagiarismCheck(ctx, taskId);
      ctx.status = 200;
      ctx.body = {
         message: '查重完成',
         data: result,
      };
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '重新查重失败') };
   }
};

module.exports.getDocTypes = async (ctx) => {
   try {
      const { models } = ctx.app.fs.dc;
      const includeDisabled = String(ctx.request.query.includeDisabled || '') === 'true';
      const where = includeDisabled ? {} : { enabled: true };
      const rows = await models.PlagiarismCheckDocTypes.findAll({
         where,
         order: [['sortOrder', 'ASC'], ['id', 'ASC']],
      });
      ctx.status = 200;
      ctx.body = rows;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '获取文档类型失败') };
   }
};

module.exports.createDocType = async (ctx) => {
   try {
      const { models } = ctx.app.fs.dc;
      const body = ctx.request.body || {};
      const typeCode = String(body.typeCode || '').trim();
      const typeName = String(body.typeName || '').trim();
      if (!typeCode) throw new Error('缺少参数: typeCode');
      if (!typeName) throw new Error('缺少参数: typeName');
      const created = await models.PlagiarismCheckDocTypes.create({
         typeCode,
         typeName,
         sortOrder: toInt(body.sortOrder, 0),
         enabled: body.enabled === undefined ? true : Boolean(body.enabled),
         updatedAt: new Date(),
      }, { returning: true });
      ctx.status = 200;
      ctx.body = created;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '创建文档类型失败') };
   }
};

module.exports.updateDocType = async (ctx) => {
   try {
      const { models } = ctx.app.fs.dc;
      const docTypeId = toInt(ctx.params.docTypeId);
      if (!docTypeId) throw new Error('缺少参数: docTypeId');
      const body = ctx.request.body || {};
      const payload = { updatedAt: new Date() };
      if (body.typeCode !== undefined) payload.typeCode = String(body.typeCode || '').trim();
      if (body.typeName !== undefined) payload.typeName = String(body.typeName || '').trim();
      if (body.sortOrder !== undefined) payload.sortOrder = toInt(body.sortOrder, 0);
      if (body.enabled !== undefined) payload.enabled = Boolean(body.enabled);
      if (payload.typeCode === '') throw new Error('typeCode 不能为空');
      if (payload.typeName === '') throw new Error('typeName 不能为空');
      const [count] = await models.PlagiarismCheckDocTypes.update(payload, {
         where: { id: docTypeId },
      });
      if (!count) throw new Error('文档类型不存在');
      ctx.status = 204;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '更新文档类型失败') };
   }
};

module.exports.deleteDocType = async (ctx) => {
   try {
      const { models } = ctx.app.fs.dc;
      const docTypeId = toInt(ctx.params.docTypeId);
      if (!docTypeId) throw new Error('缺少参数: docTypeId');
      const usingCount = await models.PlagiarismCheckFiles.count({
         where: { docTypeId },
      });
      if (usingCount > 0) {
         await models.PlagiarismCheckDocTypes.update({
            enabled: false,
            updatedAt: new Date(),
         }, { where: { id: docTypeId } });
         ctx.status = 204;
         return;
      }
      await models.PlagiarismCheckDocTypes.destroy({ where: { id: docTypeId } });
      ctx.status = 204;
   } catch (error) {
      ctx.logger?.log?.(error);
      ctx.status = 400;
      ctx.body = { message: getErrorMessage(error, '删除文档类型失败') };
   }
};