var IO = require('./io');
var meteo = require('./meteo');
var stations = require('./stations');
var chalk = require('chalk');

// {
//     station-46011: {
//         id: str
//         name: str
//         lat: str
//         lon: str

//         avg1982: {
//             d: int[365] || null,
//             w: int[52] || null,
//             m: int[12] || null,
//             y: int || null
//         },

//         avg1983: ...
//     },
//
//     {
//          id: str
//          ...
//     }
// }


module.exports = {
    /**
     *
     */
    parse: function(str) {
        var json = {};

        try {
            json = JSON.parse(str);
        } catch(e) {
            IO.error(e);
        }

        return json;
    },

    /**
     *
     */
    getYearlyAverages: function(arr, col) {
        console.log('Yearly averages for column ' + col + '.');

        if (arr.length === undefined) {
            return 0;
        }

        var sum = 0;
        var count = 0;
        var val = 0;

        arr.forEach(function(row) {
            val = parseFloat(row[col]);

            if (val === 999 || val === 0 || val === 99) {
                return;
            }

            sum += val;
            count++;
        });


        var avg = Math.round((sum / count) * 10) / 10 || 0;
        return avg;
    },

    /**
     *
     */
    getMonthlyAverages: function(arr, col) {
        console.log('Monthly averages for column ' + col + '.');

        if (arr.length === undefined) {
            return Array.apply(null, Array(12)).map(Number.prototype.valueOf,0);
        }

        var sum, count;
        var months = [];
        var averages = [];

        for (var i = 0; i < 12; i++) {
            months[i] = [];
        }

        // Assemble all the values for each month.
        arr.forEach(function(row, index) {
            months[row[1] - 1].push(parseFloat(row[col]));
        });

        // Get the average for each collection of values in each day of the year.
        months.forEach(function(values, index) {
            sum = 0;
            count = 0;

            values.map(function(value) {
                if (value === 999 || value === 0 || value === 99) {
                    return;
                }

                sum += parseFloat(value);
                count++;
            });

            averages[index] = Math.round((sum / count) * 10) / 10 || 0;
        });

        return averages;
    },

    /**
     *
     */
    getAllMonthlyAverages: function(station, col) {
        var result = [];

        for (var year = meteo.years.start; year <= meteo.years.end; year++) {
            result.push(
                IO.read(meteo.dirs.json + station + '-' + year + '.json')
                    .then(module.exports.parse)
                    .then(function(arr) {
                        return module.exports.getMonthlyAverages(arr, col);
                    })
            );
        }

        return Promise.all(result);
    },

    /**
     *
     */
    getAllYearlyAverages: function(station, col) {
        var result = [];

        for (var year = meteo.years.start; year <= meteo.years.end; year++) {
            result.push(
                IO.read(meteo.dirs.json + station + '-' + year + '.json')
                    .then(module.exports.parse)
                    .then(function(arr) {
                        return module.exports.getYearlyAverages(arr, col);
                    })
            );
        }

        return Promise.all(result);
    },

    /**
     *
     */
    getAllStations: function(arr) {
        console.log('asdf')

        return null;
    },

    /**
     *
     */
    buildFinalJson: function() {
        var finalResult = {};

        function next(index) {
            if (index === stations.ids.length) {
            // if (index === 1) {
                // IO.write('_stations.json', JSON.stringify(finalResult, null, 4));
                IO.write('_stations.json', JSON.stringify(finalResult));
                return;
            }

            var station = stations.ids[index];

            // Init objects.
            finalResult['s' + station] = {};
            for (var year = meteo.years.start; year <= meteo.years.end; year++) {
                finalResult['s' + station]['WSPD' + year] = {}; // 6
                finalResult['s' + station]['WVHT' + year] = {}; // 8
                finalResult['s' + station]['WPER' + year] = {}; // 9
                finalResult['s' + station]['ATMP' + year] = {}; // 13
                finalResult['s' + station]['WTMP' + year] = {}; // 14
            }

            Promise.resolve()
                // Stations
                .then(IO.read.bind(null, stations.dirs.json + station + '.json'))
                .then(module.exports.parse)
                .then(function(json) {
                    finalResult['s' + station].id = json.id;
                    finalResult['s' + station].name = json.name;
                    finalResult['s' + station].lat = json.lat;
                    finalResult['s' + station].lon = json.lon;
                })

                // Monthly wind speed
                .then(module.exports.getAllMonthlyAverages.bind(null, station, 6))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WSPD' + (meteo.years.start + index)].m = averages;
                    });
                })

                // Yearly wind speed
                .then(module.exports.getAllYearlyAverages.bind(null, station, 6))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WSPD' + (meteo.years.start + index)].y = averages;
                    });
                })

                // Monthly wave height
                .then(module.exports.getAllMonthlyAverages.bind(null, station, 8))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WVHT' + (meteo.years.start + index)].m = averages;
                    });
                })

                // Yearly wave height
                .then(module.exports.getAllYearlyAverages.bind(null, station, 8))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WVHT' + (meteo.years.start + index)].y = averages;
                    });
                })

                // Monthly wave period
                .then(module.exports.getAllMonthlyAverages.bind(null, station, 9))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WPER' + (meteo.years.start + index)].m = averages;
                    });
                })

                // Yearly wave period
                .then(module.exports.getAllYearlyAverages.bind(null, station, 9))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WPER' + (meteo.years.start + index)].y = averages;
                    });
                })

                // Monthly air temp
                .then(module.exports.getAllMonthlyAverages.bind(null, station, 13))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['ATMP' + (meteo.years.start + index)].m = averages;
                    });
                })

                // Yearly air temp
                .then(module.exports.getAllYearlyAverages.bind(null, station, 13))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['ATMP' + (meteo.years.start + index)].y = averages;
                    });
                })

                // Monthly water temp
                .then(module.exports.getAllMonthlyAverages.bind(null, station, 14))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WTMP' + (meteo.years.start + index)].m = averages;
                    });
                })

                // Yearly water temp
                .then(module.exports.getAllYearlyAverages.bind(null, station, 14))
                .then(function(arr) {
                    arr.forEach(function(averages, index) {
                        finalResult['s' + station]['WTMP' + (meteo.years.start + index)].y = averages;
                    });
                })

                .then(next.bind(null, index + 1))
                .catch(IO.error);
        };

        next(0);
    }
};