'use strict';

const PermissionCheck = require('../const/account_permission').PermissionCheck;

// 安全、质量巡检共用附件阶段及操作权限规则。
class InspectionAttachment {
    constructor(ctx, type) {
        if (!['safe', 'quality'].includes(type)) throw '无效的巡检类型';
        this.ctx = ctx;
        this.inspectionService = ctx.service[type + 'Inspection'];
        this.auditService = ctx.service[type + 'InspectionAudit'];
        this.attachmentService = ctx.service[type + 'InspectionAtt'];
    }

    getFileStage(file) {
        // 尚未回填的历史数据与数据库迁移后的规则保持一致。
        return file.flow_stage === null || file.flow_stage === undefined || Number(file.flow_stage) === 0 ? 1 : Number(file.flow_stage);
    }

    getUploadStage(inspection) {
        if (inspection.flow_version === 1) return [1, 2, 3].includes(inspection.flow_stage) ? inspection.flow_stage : 0;
        // 旧流程只有上报、整改，完成后的补传归入整改阶段。
        if ([3, 12].includes(inspection.status)) return 2;
        return [1, 2, 5, 6].includes(inspection.status) ? 1 : 0;
    }

    canUpload(inspection, records) {
        if (!inspection || inspection.status === 4 || !this.getUploadStage(inspection)) return false;
        if (inspection.flow_version !== 1) return Boolean(inspection.filePermission);
        // 页面和上传入口沿用中间件已计算的权限；事务内传入最新审批记录后重新校验。
        if (!records && typeof inspection.canUpload === 'boolean') return inspection.canUpload;
        const uid = this.ctx.session.sessionUser.accountId;
        if ([1, 3, 5].includes(inspection.status)) return inspection.uid === uid;
        const current = (records || inspection.auditors || []).filter(record => !record.is_old && record.times === inspection.times
            && record.flow_stage === inspection.flow_stage && record.stage_round === inspection.stage_round);
        if (inspection.flow_stage === 2) {
            current.sort((a, b) => a.audit_order - b.audit_order || a.order - b.order || a.id - b.id);
            const active = current.find(record => [1, 12].includes(record.status));
            return inspection.status === 12 && Boolean(active && active.aid === uid && active.status === 12);
        }
        return [2, 6].includes(inspection.status) && current.some(record => record.aid === uid && record.status === 2);
    }

    canDeleteFile(file, inspection, records) {
        if (!file || !inspection || file.tid !== inspection.tid || file.qiid !== inspection.id) return false;
        if (file.uid !== this.ctx.session.sessionUser.accountId || !this.canUpload(inspection, records)) return false;
        if (this.getFileStage(file) !== this.getUploadStage(inspection)) return false;
        return inspection.status !== 3 || Boolean(file.extra_upload) || PermissionCheck.delFile(this.ctx.session.sessionUser.permission);
    }

    async getFiles(qiid) {
        if (this.ctx.inspection) this.ctx.inspection.canUploadAttachments = this.canUpload(this.ctx.inspection);
        const files = await this.attachmentService.getAllAtt(this.ctx.tender.id, qiid);
        return files.map(file => Object.assign(file, {
            flow_stage: this.getFileStage(file),
            stageName: ['', '上报', '整改', '批复'][this.getFileStage(file)] || '未知阶段',
            canDelete: this.canDeleteFile(file, this.ctx.inspection),
        }));
    }

    async saveFiles(files, flowContext) {
        const transaction = await this.attachmentService.beginTransaction();
        try {
            const { current } = await this.getCurrentContext(transaction, flowContext);
            if (!files.length) throw '请选择附件';
            const payload = files.map(file => Object.assign({}, file, {
                tid: current.tid, qiid: current.id, uid: this.ctx.session.sessionUser.accountId,
                flow_stage: this.getUploadStage(current), extra_upload: current.status === 3,
            }));
            const result = await this.attachmentService.saveFileMsgToDb(payload, transaction);
            await transaction.commit();
            return result;
        } catch (err) {
            await transaction.rollback();
            throw err;
        }
    }

    async deleteFile(id, flowContext) {
        id = Number(id);
        if (!Number.isSafeInteger(id) || id <= 0) throw '无效的附件';
        const transaction = await this.attachmentService.beginTransaction();
        try {
            const { current, records } = await this.getCurrentContext(transaction, flowContext);
            const file = await this.attachmentService.getMaterialFileById(id, transaction);
            if (!this.canDeleteFile(file, current, records)) throw '只能删除本人在当前阶段上传的附件';
            await this.ctx.app.fujianOss.delete(this.ctx.app.config.fujianOssFolder + file.filepath);
            await this.attachmentService.delete(id, transaction);
            await transaction.commit();
        } catch (err) {
            await transaction.rollback();
            throw err;
        }
    }

    async getCurrentContext(transaction, flowContext) {
        const { ctx } = this;
        const rows = await this.inspectionService.getAllDataForUpdate({ id: ctx.inspection.id, tid: ctx.tender.id }, transaction);
        const current = rows[0];
        if (!current) throw '巡检不存在';
        const fields = ['flow_version', 'flow_stage', 'stage_round', 'times', 'status'];
        if (!flowContext || fields.some(key => Number(flowContext[key]) !== Number(current[key]) || Number(ctx.inspection[key]) !== Number(current[key]))) {
            throw '流程已更新，请刷新后操作附件';
        }
        current.filePermission = ctx.inspection.filePermission;
        const records = await this.auditService.getAllDataByCondition({ where: { qiid: current.id, times: current.times, is_old: 0 } }, transaction);
        if (!this.canUpload(current, records)) throw '当前不可操作附件';
        return { current, records };
    }
}

module.exports = InspectionAttachment;