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local QtCore = require 'qtcore'
local QtGui = require 'qtgui'

local Class = QtCore.Class('MyModel', QtCore.QAbstractTableModel) {}

local ROWS = 2
local COLS = 3

function Class:__static_init()
    self:__addsignal('editCompleted(QString)')
end

function Class:__init()
    -- holds text entered into QTableView
    local gridData = {}
    for row = 1,ROWS do
        gridData[row] = {}
        for col = 1,COLS do
            gridData[row][col] = ''
        end
    end
    self.m_gridData = gridData
end

function Class:parent()
    return QtCore.QModelIndex()
end

function Class:rowCount(parent)
    return ROWS
end

function Class:columnCount(parent)
    return COLS
end

function Class:data(index, role)
    local row = index:row()
    local col = index:column()

    local function data()
        if role == QtCore.DisplayRole then
            return self.m_gridData[row + 1][col + 1]
        end
    end

    local val = QtCore.QVariant()
    val:setValue(data())
    return val
end

function Class:setData(index, value, role)
    if role == QtCore.EditRole then
        -- save value from editor to member m_gridData
        self.m_gridData[index:row() + 1][index:column() + 1] = value:toString():toStdString()
        -- for presentation purposes only: build and emit a joined string
        local results = {}
        for _,rows in ipairs(self.m_gridData) do
            for _,val in ipairs(rows) do
                table.insert(results, val)
            end
        end
        results = table.concat(results, ' ')

        self:__emit('editCompleted', results)
        -- self:__emit('editCompleted', QtCore.QString(results))
    end
    return true
end

function Class:flags(index)
    local flags = QtCore.QAbstractTableModel.flags(self, index)
    table.insert(flags, 'ItemIsEditable')
    return flags
end

return Class
