-- Tab mappings ---
vim.keymap.set("n", "tn", vim.cmd.tabnew)
vim.keymap.set("n", "tq", vim.cmd.tabclose)

-- Clipboard
if vim.env.TMUX and vim.fn.executable("tmux") then
    vim.keymap.set(
        { "n", "x" },
        "<leader>y",
        "\"+y:call system('tmux load-buffer -w -', @+)<CR>"
    )
else
    vim.keymap.set({ "n", "x" }, "<leader>y", '"+y')
end
vim.keymap.set({ "n", "x" }, "<leader>p", '"+p')
vim.keymap.set({ "n", "x" }, "<leader>P", '"+P')
vim.keymap.set({ "n", "x" }, "<leader>+", ":call setreg('+', @\")<CR>")

-- Exit insert mode in terminal using <ESC>
vim.keymap.set("t", "<Esc>", "<C-\\><C-n>")

-- Feed ESC in terminal mode using <C-\>
vim.keymap.set("t", "<C-\\>", function()
    vim.api.nvim_feedkeys(
        vim.api.nvim_replace_termcodes("<Esc>", true, false, true),
        "n",
        false
    )
end)

-- Enable <C-w> window commands in terminal mode
vim.keymap.set("t", "<C-w>", "<C-\\><C-n><C-w>")

-- Use :diffput/get instead of normal one to allow staging visual selection
vim.keymap.set({ "n", "x" }, "<leader>dp", ":diffput<CR>")
vim.keymap.set({ "n", "x" }, "<leader>do", ":diffget<CR>")

local close_pum = function()
    if vim.fn.pumvisible() ~= 0 then
        return "<cmd>pclose<cr>"
    end

    for _, winid in pairs(vim.api.nvim_tabpage_list_wins(0)) do
        if vim.api.nvim_win_get_config(winid).relative ~= "" then
            return "<cmd>fclose<cr>"
        end
    end
end

vim.keymap.set({ "n", "i" }, "<C-c>", function()
    return close_pum()
end, { expr = true })

---@param force boolean
local function delete_buffer(force)
    local buffers =
        vim.split(vim.fn.execute("buffers t"), "\n", { trimempty = true })
    if #buffers < 2 then
        return
    end

    local current = tonumber(buffers[1]:match("^%s*(%d+)"))
    local previous = tonumber(buffers[2]:match("^%s*(%d+)"))

    if not current or not previous then
        return
    end

    if not force and vim.bo[current].modified then
        vim.api.nvim_echo(
            { { "Buffer has unsaved changes", "ErrorMsg" } },
            false,
            {}
        )
        return
    end

    vim.api.nvim_set_current_buf(previous)
    vim.api.nvim_buf_delete(current, { force = force })
end

vim.keymap.set("n", "<C-q>", function()
    delete_buffer(false)
end)
vim.keymap.set("n", "<M-q>", function()
    delete_buffer(true)
end)
vim.keymap.set("n", "<C-Space>", ":b#<CR>")

-- Allow (de)indenting without deselecting
vim.keymap.set({ "x" }, "<", "<gv")
vim.keymap.set({ "x" }, ">", ">gv")

-- Remove default mappings
vim.keymap.set("", "<C-LeftMouse>", "")
vim.keymap.set("n", "gr", "<Nop>")

-- Remove right-click menu items
vim.cmd.aunmenu({ "PopUp.-1-" })
vim.cmd.aunmenu({ "PopUp.How-to\\ disable\\ mouse" })

-- Insert-mode Emacs bindings
vim.keymap.set("i", "<C-f>", "<Right>")
vim.keymap.set("i", "<C-b>", "<Left>")
vim.keymap.set("i", "<C-a>", "<C-o>^")
vim.keymap.set("i", "<C-e>", "<C-o>$")
-- vim.keymap.set('i', '<C-d>', '<C-o>x') -- Overrides de-indent
vim.keymap.set("i", "<M-f>", "<C-o>w")
vim.keymap.set("i", "<M-b>", "<C-o>b")
vim.keymap.set("i", "<M-d>", "<C-o>dw")
vim.keymap.set("i", "<M-BS>", "<C-o>db")

-- Command-mode Emacs bindings
vim.keymap.set("c", "<C-f>", "<Right>")
vim.keymap.set("c", "<C-b>", "<Left>")
vim.keymap.set("c", "<C-a>", "<Home>")
vim.keymap.set("c", "<C-e>", "<End>")
vim.keymap.set("c", "<C-d>", "<Delete>")
vim.keymap.set("c", "<C-n>", "<Down>")
vim.keymap.set("c", "<C-p>", "<Up>")
vim.keymap.set("c", "<M-f>", "<C-Right>")
vim.keymap.set("c", "<M-b>", "<C-Left>")
vim.keymap.set("c", "<M-d>", "<C-Right><C-w>")
vim.keymap.set("c", "<M-BS>", "<C-w>")

vim.keymap.set("n", "<leader>ve", function()
    if vim.o.virtualedit == "all" then
        vim.o.virtualedit = "block"
    else
        vim.o.virtualedit = "all"
    end
end)

-- Replace all occurrences of word
vim.keymap.set("n", "<Leader>r", function()
    local word = vim.fn.expand("<cword>")
    local replacement = vim.fn.input('Replace "' .. word .. '" by? ')
    if replacement ~= "" then
        local cursor_pos = vim.api.nvim_win_get_cursor(0)
        vim.cmd(":%s/\\<" .. word .. "\\>/" .. replacement .. "/g")
        vim.api.nvim_win_set_cursor(0, cursor_pos)
    end
end)

vim.keymap.set("n", "]c", ":cn<CR>")
vim.keymap.set("n", "[c", ":cp<CR>")

-- Default bindings that are good to know:
-- insert mode:
--  <C-T>           - indent, see :h i_CTRL-T
--  <C-D>           - un-indent, see :h i_CTRL-D
-- normal mode:
--  H/M/L           - Jump to highest/middle/lowest line in window.
--  <count?><C-E>   - scroll window down <count> lines, see :h CTRL-E
--  <count?><C-Y>   - scroll window up <count> lines, see :h CTRL-Y
--  <C-A>           - Increment
--  <C-X>           - Decrement
--  <C-w>H          - Move window to the left
--  <C-w>J          - Move window down
--  <C-w>K          - Move window up
--  <C-w>L          - Move window to the right
--  gq{motion}      - format word-wrap of the line that {motion} moves over
--  {Visual}gq      - format word-wrap of the visually selected area
--  gqq             - format word-wrap of the current line
-- commands:
--  :make           - execute makeprg with given args, and put the output in
--                    quickfix list
--  :grep           - execute grepprg with given args, and put the results in
--                    quickfix list
--  :cex {expr}     - Create a quickfix list using the result of {expr} and
--                    jump to the first error. For example:
--                    :cex system('make')
--  :cgete {expr}   - same as :cex but don't jump to the first error
--  :copen          - open quickfix list
--  :cdo {cmd}      - execute {cmd} in each valid entry in the quickfix list.
--                    works like this:
--                      :cfirst
--                      :{cmd}
--                      :cnext
--                      :{cmd}
--                      etc.
--  :cfdo {cmd}     - same as :cdo but on each file in quickfix list
--  :cn             - go to the next error in quickfix list that includes a file name
--  :cp             - go to the previous error in quickfix list that includes a file name
--  :cc [num]       - go to the specified error in quickfix list
--  @:              - repeat last command
--  :s/foo/bar/     - substitute the first match of foo with bar in the current line
--  :s/foo/bar/g    - same as above but for all matches in the current line
--  :%s/foo/bar/g   - same as above, but for all lines in buffer
--  :%s/foo/bar/gc  - same as above but asking for confirmation on each match
--  :lua << EOF     - run a lua snippet using lua-heredoc syntax
--  local tbl = {1, 2, 3}
--  for k, v in ipairs(tbl) do
--    print(v)
--  end
--  EOF
--  :diffsplit <other-file> - open diff split