var fs = require('fs')
  , path = require('path')
  ;

function readModule(name) {
    var filename;
    if ( name.indexOf('.') === 0 ) {
        filename = path.join(path.dirname(module.filename),name+'.js');
    } else {
        var dirname = path.join(path.dirname(module.filename),
                                '../../node_modules',name);
        filename = path.join(dirname,name+'.js');
        var pkgfile = path.join(dirname,'package.json');
        if ( fs.exists(pkgfile) ) {
            var pkg = require(pkgfile);
            if ( pkg.main ) {
                filename = path.join(dirname,pkg.main);
            }
        }
    }
    var src = fs.readFileSync(filename, 'utf8');
    src = src.replace(/require\s*\(\s*(['\"])([^'"]*)(['\"])\s*\)/g,
                      'require($1views/lib/$2$3)');
    return src;
}

module.exports = {

    "schemaInfo": {
        _id: "schemaInfo",
        version: "4",
        viewsVersion: "2"
    },

    "_design/protectPublished": {
        __configAction: "replace",
        language: "javascript",
        validate_doc_update: function(newDoc, oldDoc, userCtx, secObj) {
            if ( oldDoc && oldDoc.publicationDate ) {
                throw({forbidden:'Published documents cannot be modified.'});
            }
        }
    },

    "_design/default": {
        __configAction: "replace",
        language: "javascript",
        views: {
            by_type: {
                map: function(doc){
                    emit(doc.type, 1);
                },
                reduce: function(keys,values){ return sum(values); }
            },
            typeless: {
                map: function(doc){
                    if ( !doc.type ) {
                        emit(doc._id, doc);
                    }
                }
            }
        }
    },

    "_design/questions": {
        __configAction: "replace",
        language: "javascript",
        views: {
            all: {
                map: function(doc){
                    if ( doc.type !== 'Question' ) { return; }
                    if ( doc.categories && doc.categories.length > 0 ) {
                        for ( var i = 0; i < doc.categories.length; i++ ) { 
                            emit([doc.categories[i],doc.topic||"(default)"],1);
                        } 
                    } else { 
                        emit(["(default)","(default)"],1); 
                    } 
                },
                reduce: function(keys,values){ return sum(values); }
            },
            published: {
                map: function(doc){
                    if ( doc.type!=='Question' || !doc.publicationDate ) { return; }
                    if ( doc.categories && doc.categories.length > 0 ) {
                        for ( var i = 0; i < doc.categories.length; i++ ) {
                            emit([doc.categories[i],doc.topic||"(default)"],1);
                        }
                    } else {
                        emit(["(default)","(default)"],1);
                    }
                },
                reduce: function(keys,values){ return sum(values); }
            },
            all_topics: {
                map: function(doc){
                    if( doc.type !== 'Question' ){ return; }
                    emit(doc.topic||"(default)",1);
                },
                reduce: function(key, values, rereduce) { return sum(values); }
            },
            published_topics: {
                map: function(doc){
                    if ( doc.type !== 'Question' || !doc.publicationDate ) { return; }
                    emit(doc.topic||"(default)",1);
                },
                reduce: function(key, values ) { return sum(values); }
            },
            all_variables: {
                map: function(doc) {
                    if ( doc.type !== 'Question' ) { return; }
                    var _ = require('views/lib/underscore');
                    var objF = require('views/lib/object');
                    _.chain(objF.collectFields('subcode',doc.content))
                    .map(function(subcode){
                        return doc.code+subcode;
                    })
                    .each(function(variable){
                        emit(variable,doc._id);
                    });
                }
            },
            published_variables: {
                map: function(doc) {
                    if ( doc.type !== 'Question' || !doc.publicationDate ) { return; }
                    var _ = require('views/lib/underscore');
                    var objF = require('views/lib/object');
                    _.chain(objF.collectFields('subcode',doc.content))
                    .map(function(subcode){
                        return doc.code+subcode;
                    })
                    .each(function(variable){
                        emit(variable,doc._id);
                    });
                }
            },
            all_by_code: {
                map: function(doc){
                    if ( doc.type !== 'Question' ) { return; }
                    emit(doc.code,1);
                },
                reduce: function(key, values) { return sum(values); }
            },
            published_by_code: {
                map: function(doc){
                    if ( doc.type !== 'Question' ||
                         !doc.publicationDate ) { return; }
                    emit(doc.code,1);
                },
                reduce: function(key, values) { return sum(values); }
            },
            lib: {
                underscore: readModule('underscore'),
                object: readModule('../util/object')
            }
        }
    },

    "_design/surveys": {
        __configAction: "replace",
        language: "javascript",
        views: {
            drafts: {
                map: function(doc){
                    if ( doc.type !== 'Survey' ||
                         doc.publicationDate ) { return; }
                    emit(doc._id,doc);
                }
            },
            published: {
                map: function(doc){
                    if ( doc.type !== 'Survey' ||
                         !doc.publicationDate ) { return; }
                    emit(doc._id,doc);
                }
            }
        }
    },

    "_design/surveyRuns": {
        __configAction: "replace",
        language: "javascript",
        views: {
            by_start_date: {
                map: function(doc){
                    if ( doc.type !== 'SurveyRun' ) { return; }
                    emit(doc.startDate||null,1);
                },
                reduce: function(keys,values){ return sum(values); }
            },
            by_end_date: {
                map: function(doc){
                    if ( doc.type !== 'SurveyRun' ) { return; }
                    emit(doc.endDate||{},1);
                },
                reduce: function(keys,values){ return sum(values); }
            }
        }
    },

    "_design/responses": {
        __configAction: "replace",
        language: "javascript",
        views: {
            by_surveyrun: {
                map: function(doc){
                    if ( doc.type !== 'Response' ) { return; }
                    emit(doc.surveyRunId, 1);
                },
                reduce: function(keys,values){ return sum(values); }
            }
        }
    }

};