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local capabilities = require("cmake.capabilities")
local scan = require("plenary.scandir")
local utils = require("cmake.utils")

local query_path_suffix = { ".cmake", "api", "v1", "query", "client-cmake", "query.json" }
local reply_dir_suffix = { ".cmake", "api", "v1", "reply" }

local FileApi = {}

---@class CMakeFileApi
---@field targets CMakeFileApiTarget[]
---@field current_executable_target? number Index for current executable target
---
---@class CMakeFileApiTarget
---@field id string Unique tagret id
---@field name string Target name
---@field type "EXECUTABLE"|"STATIC_LIBRARY"|"SHARED_LIBRARY"|"MODULE_LIBRARY"|"OBJECT_LIBRARY"|"INTERFACE_LIBRARY"|"UTILITY" Target type
---@field path string|nil Path to executable associated with target

function FileApi.create(path, callback)
	local query = vim.fs.joinpath(path, unpack(query_path_suffix))
	utils.file_exists(query, function(exists)
		if not exists then
			if capabilities.json.fileApi then
				vim.schedule(function()
					vim.fn.mkdir(vim.fs.dirname(query), "p")
					utils.write_file(query, vim.json.encode(capabilities.json.fileApi), callback)
				end)
			else
				vim.notify("Bad fileApi ", vim.log.levels.ERROR)
			end
		else
			callback()
		end
	end)
end

function FileApi.read_reply(path, callback)
	local reply_dir = vim.fs.joinpath(path, unpack(reply_dir_suffix))
	utils.file_exists(reply_dir, function(exists)
		if not exists then
			return
		end
		local ret = { targets = {} }
		--TODO: replace with uv scandir
		scan.scan_dir_async(reply_dir, {
			search_pattern = "index*",
			on_exit = function(results)
				if #results == 0 then
					return
				end
				utils.read_file(results[1], function(index_data)
					local index = vim.json.decode(index_data)
					for _, object in ipairs(index.objects) do
						if object.kind == "codemodel" then
							utils.read_file(vim.fs.joinpath(reply_dir, object.jsonFile), function(codemodel_data)
								local codemodel = vim.json.decode(codemodel_data)
								for _, target in ipairs(codemodel.configurations[1].targets) do
									local work = vim.uv.new_work(utils.read_file_sync, function(target_data)
										local target_json = vim.json.decode(target_data)
										---@type CMakeTarget
										local _target = {
											id = target_json.id,
											name = target_json.name,
											type = target_json.type,
											path = nil,
										}
										if target_json.artifacts then
											--NOTE: add_library(<name> OBJECT ...) could contain more than ohe object in artifacts
											-- so maybe in future it will be useful to handle not only first one. Current behaviour
											-- aims to get path for only EXECUTABLE targets
											_target.path = target_json.artifacts[1].path
										end
										callback(_target)
									end)
									vim.uv.queue_work(work, vim.fs.joinpath(reply_dir, target.jsonFile))
								end
							end)
						end
					end
				end)
			end,
		})
		return ret
	end)
end

function FileApi.query_exists(path, callback)
	utils.file_exists(vim.fs.joinpath(path, unpack(query_path_suffix)), function(query_exists)
		callback(query_exists)
	end)
end

function FileApi.exists(path, callback)
	FileApi.query_exists(path, function(query_exists)
		if not query_exists then
			callback(false)
		else
			utils.file_exists(vim.fs.joinpath(path, unpack(reply_dir_suffix)), function(reply_exists)
				callback(reply_exists)
			end)
		end
	end)
end

return FileApi