Module:AmericanBahai

local module = {}

-- Define a list of issues which have two pages stitched together
-- [0202] = 8 means Volume 2 Issue 2 pages 8 and 9 are combined
local pdfDoublePage_map = {
    [0202] = 8,
    [0203] = 8,
    [0204] = 6,
    [0808] = 4,
    [1006] = 10,
    [1011] = 10,
    [1404] = 14,
    [1512] = 14,
    [3002] = 16,
    [3102] = 16,
    [3501] = 18,
}
	
-- Define a list of issues where the PDF page and publication page are different
-- For example starting in volume 35 there is a front page which requires offseting by 1
pdfOffset_map = {
    [351] = 1,
}

local publicationDate_map = {
    [1] = "1970",
    [2] = "1971",
    [3] = "1972",
    [4] = "1973",
    [5] = "1974",
    [6] = "1975",
    [7] = "1976",
    [8] = "1977",
    [9] = "1978",
    [10] = "1979",
    [11] = "1980",
    [12] = "1981",
    [13] = "1982",
    [14] = "1983",
    [15] = "1984",
    [16] = "1985",
    [17] = "1986",
    [18] = "1987",
    [19] = "1988",
    [20] = "1989",
    [21] = "1990",
    [22] = "1991",
    [23] = "1992",
    [24] = "1993",
    [25] = "1994",
    [26] = "1995",
    [27] = "1996",
    [28] = "1997",
    [29] = "1998",
    [30] = "1999",
    [31] = "2000",
    [32] = "2001",
}

-- Define a table mapping special titles to other text
local specialInfo_map = {
	["The_American_Bahá’í_February_1978_Extra"] = { title = "Extra!", date = "February, 1978" },
    ["The_American_Bahá’í_March_1978_Extra"] = { title = "Extra!", date = "March, 1978" },
    ["The_American_Bahá’í_August_1978_Special"] = { title = "Special Issue", date = "August, 1978" },
    ["The_American_Bahá’í_September_1978_Special"] = { title = "Special Teaching Edition", date = "September, 1978" },
    ["The_American_Bahá’í_October_1978_Special"] = { title = "Special Teaching Edition", date = "October, 1978" },
    ["The_American_Bahá’í_February_1979_Special"] = { title = "Special Issue", date = "February, 1979" },
    ["The_American_Bahá’í_March_1979_Extra"] = { title = "Extra!", date = "March, 1979" },
    ["The_American_Bahá’í_December_1985_Special"] = { title = "Special issue!", date = "December, 1985" },
    ["The_American_Bahá’í_Vol22_No11-Special"] = { title = "Bahá’í World Congress Special Edition", date = "November, 1991" },
    ["The_American_Bahá’í_Vol23_No13a"] = { title = "The Right of God, Huqúqu’lláh, Special Edition", date = "September 8, 1992" },
}

-- Function to retrieve text based on the provided title
function module.getSpecialInfoTitle(frame)
    local key = frame.args[1]
    local info = specialInfo_map[key]
    if info then
        return info.title
    else
        return "Title not found for key: " .. key
    end
end

function module.getSpecialInfoDate(frame)
    local key = frame.args[1]
    local info = specialInfo_map[key]
    if info then
        return info.date
    else
        return "Date not found for key: " .. key
    end
end

-- Accept the input as the volume number, issue number, and return date published
function module.publicationDate(frame)
    local volNumber = tonumber(frame.args[1])
    return publicationDate_map[volNumber]
end

-- Accept the input as the volume number, issue number, and return date published
function module.publicationDate(frame)
    local volNumber = tonumber(frame.args[1])
    return publicationDate_map[volNumber]
end

-- Accept the input as volume number, issue number, and page number
function module.pdfOffset(frame)
    local volumeNumber = tonumber(frame.args[1]) or 0
    local issueNumber = tonumber(frame.args[2]) or 0
    local pageNumber = tonumber(frame.args[3]) or 0 -- The actual publication page number

    -- Get the double-page offset if specified in pdfDoublePage_map
    local doublePageKey = string.format("%02d%02d", volumeNumber, issueNumber)
    local doublePageValue = pdfDoublePage_map[tonumber(doublePageKey)] or 0

    -- Check if there is an entry in pdfOffset_map (the base offset for PDF vs publication pages)
    local offsetMapKey = string.format("%02d%02d", volumeNumber, issueNumber)
    local offsetMapValue = pdfOffset_map[tonumber(offsetMapKey)] or 0

    -- If there's a double-page defined
    if doublePageValue > 0 then
        -- If the page number is before or equal to the double page (no offset needed yet)
        if pageNumber <= doublePageValue then
            return offsetMapValue -- Return the base offset
        else
            -- If the page is after the double page, subtract 1 to account for the double-page loss
            return offsetMapValue - 1 -- Shift by -1 due to the double page
        end
    else
        -- No double-page scenario, just return the base offset
        return offsetMapValue
    end
end

return module