local export = {}

local m_links = require("Module:links")
local m_utils = require("Module:utilities")

local lang = require("Module:languages").getByCode("goh")

local decl_data = {}

decl_data["a-m"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
	},
}
setmetatable(decl_data["a-m"], {__call = function(self, args, data)
	data.decl_type = "陽性a-詞幹"
	
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]
	
	data.forms["nom_sg"] = {args.alt1 or args[1]}
	data.forms["acc_sg"] = {args.alt1 or args[1]}
	data.forms["gen_sg"] = {a2 .. "es"}
	data.forms["dat_sg"] = {a2 .. "e"}
	data.forms["ins_sg"] = {a2 .. "u"}

	data.forms["nom_pl"] = {a2 .. "a"}
	data.forms["acc_pl"] = {a2 .. "a"}
	data.forms["gen_pl"] = {a2 .. "o"}
	data.forms["dat_pl"] = {a2 .. "um"}
	
	table.insert(data.categories, "古高地德語a-詞幹名詞")
end
})

decl_data["a-n"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
	},
}
setmetatable(decl_data["a-n"], {__call = function(self, args, data)
	decl_data["a-m"](args, data)
	
	data.decl_type = "中性a-詞幹"

	data.forms["nom_pl"] = {args.alt1 or args[1]}
	data.forms["acc_pl"] = {args.alt1 or args[1]}
end
})

decl_data["i-f"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
		["nom_sg"] = {},
		},
}
setmetatable(decl_data["i-f"], {__call = function(self, args, data)
	data.decl_type = "陰性i-詞幹"
	
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]
	
	data.forms["nom_sg"] = {args.nom_sg or args.alt1 or args[1]}
	data.forms["acc_sg"] = {args.nom_sg or args.alt1 or args[1]}
	data.forms["gen_sg"] = {a2 .. "i"}
	data.forms["dat_sg"] = {a2 .. "i"}

	data.forms["nom_pl"] = {a2 .. "i"}
	data.forms["acc_pl"] = {a2 .. "i"}
	data.forms["gen_pl"] = {a2 .. "o"}
	data.forms["dat_pl"] = {a2 .. "en"}
	
	table.insert(data.categories, "古高地德語i-詞幹名詞")
end
})

decl_data["i-m"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
		["nom_sg"] = {},
		},
}
setmetatable(decl_data["i-m"], {__call = function(self, args, data)
	data.decl_type = "陽性i-詞幹"
	
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]

	data.forms["nom_sg"] = {args.nom_sg or args.alt1 or args[1]}
	data.forms["acc_sg"] = {args.nom_sg or args.alt1 or args[1]}
	data.forms["gen_sg"] = {args.alt1 or args[1] .. "es"}
	data.forms["dat_sg"] = {args.alt1 or args[1] .. "e"}
	data.forms["ins_sg"] = {args.alt1 or args[1] .. "u"}

	data.forms["nom_pl"] = {a2 .. "i"}
	data.forms["acc_pl"] = {a2 .. "i"}
	data.forms["gen_pl"] = {a2 .. "o"}
	data.forms["dat_pl"] = {a2 .. "en"}
	
	table.insert(data.categories, "古高地德語i-詞幹名詞")
end
})

decl_data["ja-m"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
	},
}
setmetatable(decl_data["ja-m"], {__call = function(self, args, data)
	data.decl_type = "陽性ja-詞幹"
	
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]
	
	data.forms["nom_sg"] = {(args.alt1 or args[1]) .. "i"}
	data.forms["acc_sg"] = {(args.alt1 or args[1]) .. "i"}
	data.forms["gen_sg"] = {a2 .. "es"}
	data.forms["dat_sg"] = {a2 .. "e"}
	data.forms["ins_sg"] = {a2 .. "u"}

	data.forms["nom_pl"] = {a2 .. "a"}
	data.forms["acc_pl"] = {a2 .. "a"}
	data.forms["gen_pl"] = {a2 .. "o"}
	data.forms["dat_pl"] = {a2 .. "im"}
	
	table.insert(data.categories, "古高地德語ja-詞幹名詞")
end
})

decl_data["ja-n"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
	},
}
setmetatable(decl_data["ja-n"], {__call = function(self, args, data)
	decl_data["ja-m"](args, data)
	
	data.decl_type = "中性ja-詞幹"

	data.forms["nom_pl"] = {(args.alt1 or args[1]) .. "i"}
	data.forms["acc_pl"] = {(args.alt1 or args[1]) .. "i"}
end
})

decl_data["n-m"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
	},
}
setmetatable(decl_data["n-m"], {__call = function(self, args, data)
	data.decl_type = "陽性n-詞幹"
	
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]
	
	data.forms["nom_sg"] = {args.alt1 or args[1] .. "o"}
	data.forms["acc_sg"] = {args.alt1 or args[1] .. "on"}
	data.forms["gen_sg"] = {a2 .. "en"}
	data.forms["dat_sg"] = {a2 .. "en"}

	data.forms["nom_pl"] = {a2 .. "on"}
	data.forms["acc_pl"] = {a2 .. "on"}
	data.forms["gen_pl"] = {a2 .. "ōno"}
	data.forms["dat_pl"] = {a2 .. "ōm"}
	
	table.insert(data.categories, "古高地德語n-詞幹名詞")
end
})

decl_data["n-n"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
	},
}
setmetatable(decl_data["n-n"], {__call = function(self, args, data)
	data.decl_type = "中性n-詞幹"
	
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]
	
	data.forms["nom_sg"] = {args.alt1 or args[1] .. "a"}
	data.forms["acc_sg"] = {args.alt1 or args[1] .. "a"}
	data.forms["gen_sg"] = {a2 .. "en"}
	data.forms["dat_sg"] = {a2 .. "en"}

	data.forms["nom_pl"] = {a2 .. "un"}
	data.forms["acc_pl"] = {a2 .. "un"}
	data.forms["gen_pl"] = {a2 .. "ōno"}
	data.forms["dat_pl"] = {a2 .. "ōm"}
	
	table.insert(data.categories, "古高地德語n-詞幹名詞")
end
})

decl_data["n-f"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
		},
}
setmetatable(decl_data["n-f"], {__call = function(self, args, data)
	decl_data["n-n"](args, data)
	
	data.decl_type = "陰性n-詞幹"
	
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]

	data.forms["acc_sg"] = {args.alt1 or args[1] .. "ūn"}
	data.forms["gen_sg"] = {a2 .. "ūn"}
	data.forms["dat_sg"] = {a2 .. "ūn"}
end
})

decl_data["o-f"] = {
	params = {
		[1] = {},
		["alt1"] = {},
		},
}
setmetatable(decl_data["o-f"], {__call = function(self, args, data)
	data.decl_type = "ō-詞幹"
	
	local a1 = args.alt1 or args[1]
	
	data.forms["nom_sg"] = {a1 .. "a"}
	data.forms["acc_sg"] = {a1 .. "a"}
	data.forms["gen_sg"] = {a1 .. "a"}
	data.forms["dat_sg"] = {a1 .. "u"}

	data.forms["nom_pl"] = {a1 .. "ā"}
	data.forms["acc_pl"] = {a1 .. "ā"}
	data.forms["gen_pl"] = {a1 .. "ōno"}
	data.forms["dat_pl"] = {a1 .. "ōm"}

	table.insert(data.categories, "古高地德語ō-詞幹名詞")
end
})

decl_data["wa-m"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
		["nomsg"] = {},
	},
}
setmetatable(decl_data["wa-m"], {__call = function(self, args, data)
	data.decl_type = "陽性wa-詞幹"
	
	local ns = args.nomsg or args.alt1 or args[1]
	local a2 = args.alt2 or args[2] or args.alt1 or args[1]
	
	data.forms["nom_sg"] = {ns}
	data.forms["acc_sg"] = {ns}
	data.forms["gen_sg"] = {a2 .. "wes"}
	data.forms["dat_sg"] = {a2 .. "we"}

	data.forms["nom_pl"] = {(args.alt1 or args[1]) .. "wa"}
	data.forms["acc_pl"] = {(args.alt1 or args[1]) .. "wa"}
	data.forms["gen_pl"] = {a2 .. "wo"}
	data.forms["dat_pl"] = {a2 .. "wum"}
	
	table.insert(data.categories, "古高地德語wa-詞幹名詞")
end
})

decl_data["wa-n"] = {
	params = {
		[1] = {},
		[2] = {},
		["alt1"] = {},
		["alt2"] = {},
		["nomsg"] = {},
		},
}
setmetatable(decl_data["wa-n"], {__call = function(self, args, data)
	decl_data["wa-m"](args, data)
	
	data.decl_type = "中性wa-詞幹"
	
	local ns = args.nomsg or args.alt1 or args[1]

	data.forms["nom_pl"] = {ns}
	data.forms["acc_pl"] = {ns}
end
})

-- The main entry point.
-- This is the only function that can be invoked from a template.
function export.show(frame)

	local parent_args = frame:getParent().args
	local decl_type = (frame.args["decl"] or parent_args["decl"]) or "a-m"

	if not decl_data[decl_type] then
		error("Unknown declension '" .. decl_type .. "'")
	end
	
	local data = {forms = {}, categories = {}}
	
	data.head = parent_args["head"] or nil

	local args = require("Module:parameters").process(parent_args, decl_data[decl_type].params, true)
	
	-- Override for templates
	if not args[1] then
		setmetatable(args, {__index = function(self, key)
			return "{{{" .. key .. "}}}"
		end
		})
	end
	
	-- Generate the forms
	if parent_args.irr then
		table.insert(data.categories, "古高地德語不規則名詞")
		if decl_data.irregular[parent_args.irr] then
			decl_data.irregular[parent_args.irr](data)
		else
			decl_data[decl_type](args, data)
		end
	else
		decl_data[decl_type](args, data)
	end

	-- Make the table
	return make_table(data)
end

function make_table(data)
	local function show_form(form)
		if not form then
			return "—"
		end
		
		local ret = {}
		
		for key, subform in ipairs(form) do
			if mw.title.getCurrentTitle().nsText == "Reconstruction" and subform ~= "—" then
				subform = "*" .. subform
			end
			table.insert(ret, m_links.full_link({lang = lang, term = subform}))
		end
			
		return table.concat(ret, ", ")
	end
	
	local function repl(param)
		if param == "decl_type" then
			return data.decl_type
		else
			return show_form(data.forms[param])
		end
	end

	local wikicode = [=[<div class="NavFrame" style="width:30em">
<div class="NavHead" style="">{{{nom_sg}}} 的變格({{{decl_type}}})</div>
<div class="NavContent">

{| style="background:#F5FFFA;text-align:center;width:30em" class="inflection-table"
|-
! style="background:#F5FFFA" | 格
! style="background:#93C572; width: 37.5%" | 單數
! style="background:#93C572; width: 37.5%" | 複數
|-
! style="background:#90EE90" | 主格
| {{{nom_sg}}}
| {{{nom_pl}}}
|-
! style="background:#90EE90" | 賓格
| {{{acc_sg}}}
| {{{acc_pl}}}
|-
! style="background:#90EE90" | 屬格
| {{{gen_sg}}}
| {{{gen_pl}}}
|-
! style="background:#90EE90" | 與格
| {{{dat_sg}}}
| {{{dat_pl}}}
]=]

if data.forms.ins_sg or data.forms.ins_pl then
	wikicode = wikicode .. [=[|-
! style="background:#90EE90" | 工具格
| {{{ins_sg}}}
| {{{ins_pl}}}
]=]
end
	wikicode = wikicode .. "|}</div></div>"

	return (mw.ustring.gsub(wikicode, "{{{([a-z0-9_]+)}}}", repl)) .. m_utils.format_categories(data.categories, lang)
end

return export