local SUPPORTED_KEYS = {
    { on = "0" },
    { on = "1" },
    { on = "2" },
    { on = "3" },
    { on = "4" },
    { on = "5" },
    { on = "6" },
    { on = "7" },
    { on = "8" },
    { on = "9" },
    { on = "A" },
    { on = "B" },
    { on = "C" },
    { on = "D" },
    { on = "E" },
    { on = "F" },
    { on = "G" },
    { on = "H" },
    { on = "I" },
    { on = "J" },
    { on = "K" },
    { on = "L" },
    { on = "M" },
    { on = "N" },
    { on = "O" },
    { on = "P" },
    { on = "Q" },
    { on = "R" },
    { on = "S" },
    { on = "T" },
    { on = "U" },
    { on = "V" },
    { on = "W" },
    { on = "X" },
    { on = "Y" },
    { on = "Z" },
    { on = "a" },
    { on = "b" },
    { on = "c" },
    { on = "d" },
    { on = "e" },
    { on = "f" },
    { on = "g" },
    { on = "h" },
    { on = "i" },
    { on = "j" },
    { on = "k" },
    { on = "l" },
    { on = "m" },
    { on = "n" },
    { on = "o" },
    { on = "p" },
    { on = "q" },
    { on = "r" },
    { on = "s" },
    { on = "t" },
    { on = "u" },
    { on = "v" },
    { on = "w" },
    { on = "x" },
    { on = "y" },
    { on = "z" },
}

local _notify = ya.sync(function(state, message)
    ya.notify({
        title = state.notify.title,
        content = message,
        timeout = state.notify.timeout,
        level = state.notify.level,
    })
end)

local _get_default_projects = ya.sync(function(state)
    return {
        list = {},
        last = nil,
    }
end)

local _save_state = ya.sync(function(state, projects)
    state.projects = projects
    ps.pub_static(10, "projects", projects)
end)

local _load_state = ya.sync(function(state)
    ps.sub_remote("projects", function(body)
        if not state.projects and body then
            state.projects = _get_default_projects()

            for _, value in pairs(body.list) do
                state.projects.list[#state.projects.list + 1] = value
            end

            state.projects.last = body.last
        end
    end)
end)

local _get_projects = ya.sync(function(state)
    return not state.projects and _get_default_projects() or state.projects
end)

local _get_real_idx = ya.sync(function(state, idx)
    for real_idx, value in pairs(_get_projects().list) do
        if value.on == SUPPORTED_KEYS[idx].on then
            return tonumber(real_idx)
        end
    end

    return nil
end)

local _get_current_project = ya.sync(function(state)
    local tabs = cx.tabs

    -- TODO: add more tab properties
    local project = {
        active_idx = tonumber(tabs.idx),
        tabs = {},
    }

    for index, tab in ipairs(tabs) do
        project.tabs[#project.tabs + 1] = {
            idx = index,
            cwd = tostring(tab.current.cwd),
        }
    end

    return project
end)

local save_project = ya.sync(function(state, idx, desc)
    local projects = _get_projects()

    local real_idx = _get_real_idx(idx)
    if not real_idx then
        real_idx = #projects.list + 1
    end

    local project = _get_current_project()
    projects.list[real_idx] = {
        on = SUPPORTED_KEYS[idx].on,
        desc = desc,
        project = project,
    }

    if state.last.update_after_save then
        projects.last = project
    end

    _save_state(projects)

    if state.notify.enable then
        local message = string.format("Project saved to %s", state.projects.list[real_idx].on)
        _notify(message)
    end
end)

local load_project = ya.sync(function(state, project, desc)
    -- TODO: add more tab properties to restore

    for _ = 1, #cx.tabs - 1 do
        ya.manager_emit("tab_close", { 0 })
    end

    local sorted_tabs = {}
    for _, tab in pairs(project.tabs) do
        sorted_tabs[tonumber(tab.idx)] = tab
    end
    for _, tab in pairs(sorted_tabs) do
        ya.manager_emit("tab_create", { tab.cwd })
    end

    ya.manager_emit("tab_close", { 0 })
    ya.manager_emit("tab_switch", { project.active_idx - 1 })

    if state.last.update_after_load then
        local projects = _get_projects()
        projects.last = project
        _save_state(projects)
    end

    if state.notify.enable then
        local message
        if desc then
            message = string.format([["%s" loaded]], desc)
        else
            message = string.format([[Last project loaded]], desc)
        end
        _notify(message)
    end
end)

local delete_all_projects = ya.sync(function(state)
    _save_state(nil)

    if state.notify.enable then
        local message = "All projects deleted"
        _notify(message)
    end
end)

local delete_project = ya.sync(function(state, idx)
    local projects = _get_projects()

    local message = string.format([["%s" deleted]], tostring(projects.list[idx].desc))

    table.remove(projects.list, idx)
    _save_state(projects)

    if state.notify.enable then
        _notify(message)
    end
end)

local save_last_and_quit = ya.sync(function(state)
    local projects = _get_projects()
    projects.last = _get_current_project()

    _save_state(projects)

    ya.manager_emit("quit", {})
end)

return {
    entry = function(_, args)
        local action = args[1]
        if not action then
            return
        end

        if action == "save" then
            local idx = ya.which({ cands = SUPPORTED_KEYS, silent = false })
            if not idx then
                return
            end

            local default_desc = string.format("Project %s", SUPPORTED_KEYS[idx].on)
            local value, event = ya.input({
                title = "Project name:",
                value = default_desc,
                position = { "center", w = 40 },
            })
            if event ~= 1 then
                return
            end

            local desc
            if value ~= "" then
                desc = value
            else
                desc = default_desc
            end

            save_project(idx, desc)
            return
        end

        if action == "delete_all" then
            delete_all_projects()
            return
        end

        if action == "quit" then
            save_last_and_quit()
            return
        end

        local projects = _get_projects()

        if action == "load_last" then
            local last_project = projects.last
            if last_project then
                load_project(last_project)
            end
            return
        end

        local list = projects.list

        local selected_idx = ya.which({ cands = list, silent = false })
        if not selected_idx then
            return
        end

        if action == "load" then
            local selected = list[selected_idx]
            load_project(selected.project, selected.desc)
        elseif action == "delete" then
            delete_project(selected_idx)
        end
    end,
    setup = function(state, args)
        state.last = {
            update_after_save = true,
            update_after_load = true,
        }
        if type(args.last) == "table" then
            if type(args.last.update_after_save) == "boolean" then
                state.last.update_after_save = args.last.update_after_save
            end
            if type(args.last.update_after_load) == "boolean" then
                state.last.update_after_load = args.last.update_after_load
            end
        end

        state.notify = {
            enable = true,
            title = "Projects",
            timeout = 3,
            level = "info",
        }
        if type(args.notify) == "table" then
            if type(args.notify.enable) == "boolean" then
                state.notify.enable = args.notify.enable
            end
            if type(args.notify.title) == "string" then
                state.notify.title = args.notify.title
            end
            if type(args.notify.timeout) == "number" then
                state.notify.timeout = args.notify.timeout
            end
            if type(args.notify.level) == "string" then
                state.notify.level = args.notify.level
            end
        end

        _load_state()
    end,
}