if vim.g.loaded_git then
    return
end
vim.g.loaded_git = 1

local DEFAULT_HIGHLIGHTS = {
    GitIgnored = "Comment",
    GitSha = "Identifier",
    GitStaged = "Constant",
    GitUnmerged = "Todo",
    GitUnpulled = "Removed",
    GitUnpushed = "Added",
    GitUnstaged = "Changed",
    GitUntracked = "Added",

    GitStagedAdded = "GitStaged",
    GitStagedCopied = "GitStaged",
    GitStagedDeleted = "GitStaged",
    GitStagedModified = "GitStaged",
    GitStagedRenamed = "GitStaged",
    GitStagedTypeChanged = "GitStaged",

    GitUnstagedAdded = "GitUnstaged",
    GitUnstagedCopied = "GitUnstaged",
    GitUnstagedDeleted = "Removed",
    GitUnstagedModified = "GitUnstaged",
    GitUnstagedRenamed = "GitStaged",
    GitUnstagedTypeChanged = "GitUnstaged",

    GitUnmergedAddedByThem = "GitUnmerged",
    GitUnmergedAddedByUs = "GitUnmerged",
    GitUnmergedBothAdded = "GitUnmerged",
    GitUnmergedBothDeleted = "GitUnmerged",
    GitUnmergedBothModified = "GitUnmerged",
    GitUnmergedDeletedByThem = "GitUnmerged",
    GitUnmergedDeletedByUs = "GitUnmerged",
}
for name, link in pairs(DEFAULT_HIGHLIGHTS) do
    vim.api.nvim_set_hl(0, name, { link = link, default = true })
end

local group = vim.api.nvim_create_augroup("ow.git", { clear = true })

vim.api.nvim_create_autocmd({ "BufReadPost", "BufNewFile" }, {
    group = group,
    callback = function(args)
        require("git.core.repo").track(args.buf)
    end,
})
vim.api.nvim_create_autocmd({ "BufWritePost", "FileChangedShellPost" }, {
    group = group,
    callback = function(args)
        require("git.core.repo").refresh(args.buf)
    end,
})
vim.api.nvim_create_autocmd({ "ShellCmdPost", "TermLeave", "FocusGained" }, {
    group = group,
    callback = function()
        require("git.core.repo").refresh_all()
    end,
})
vim.api.nvim_create_autocmd({ "BufDelete", "BufWipeout" }, {
    group = group,
    callback = function(args)
        require("git.core.repo").unbind(args.buf)
    end,
})
vim.api.nvim_create_autocmd("VimLeavePre", {
    group = group,
    callback = function()
        require("git.core.repo").stop_all()
    end,
})
vim.api.nvim_create_autocmd({ "VimEnter", "DirChanged", "TabEnter" }, {
    group = group,
    callback = function()
        require("git.core.repo").update_cwd_repo()
    end,
})
vim.api.nvim_create_autocmd("TabClosed", {
    group = group,
    callback = function(args)
        local tab = tonumber(args.file) --[[@as integer?]]
        if tab then
            require("git.core.repo").release_tab(tab)
        end
    end,
})

vim.api.nvim_create_autocmd("BufReadCmd", {
    pattern = "git://*",
    group = group,
    callback = function(args)
        require("git.object").read_uri(args.buf)
    end,
})
vim.api.nvim_create_autocmd("BufReadCmd", {
    pattern = "gitlog://*",
    group = group,
    callback = function(args)
        require("git.log_view").read_uri(args.buf)
    end,
})
vim.api.nvim_create_autocmd("BufReadCmd", {
    pattern = "gitstatus://*",
    group = group,
    callback = function(args)
        require("git.status_view").read_uri(args.buf)
    end,
})

vim.api.nvim_create_user_command("G", function(opts)
    local cmd = require("git.cmd")
    cmd.run(cmd.parse_args(opts.args), { bang = opts.bang })
end, {
    nargs = "*",
    bang = true,
    complete = function(...)
        return require("git.cmd").complete(...)
    end,
})

vim.api.nvim_create_user_command("Grefresh", function()
    require("git.core.repo").refresh_all()
end, { desc = "Refresh git status for all repos" })

vim.api.nvim_create_user_command("Glog", function(opts)
    require("git.log_view").run_glog(opts)
end, {
    nargs = "*",
    complete = function(...)
        return require("git.log_view").complete_glog(...)
    end,
    desc = "Show git log",
})

local function complete_rev(...)
    return require("git.cmd").complete_rev(...)
end

local DIFF_DIRECTIONS = { "vertical", "horizontal" }

local function default_vertical()
    return vim.tbl_contains(vim.opt.diffopt:get(), "vertical")
end

vim.api.nvim_create_user_command("Gdiffsplit", function(opts)
    local fargs = opts.fargs
    local vertical = default_vertical()
    local rev_idx = 1
    if fargs[1] == "vertical" then
        vertical = true
        rev_idx = 2
    elseif fargs[1] == "horizontal" then
        vertical = false
        rev_idx = 2
    end
    require("git.diff").split({ rev = fargs[rev_idx], vertical = vertical })
end, {
    nargs = "*",
    complete = function(arg_lead, cmd_line, _)
        local rest = cmd_line:gsub("^%s*%S+%s*", "", 1)
        local trailing_space = rest == "" or rest:sub(-1):match("%s") ~= nil
        local tokens = vim.split(vim.trim(rest), "%s+", { trimempty = true })
        local prior = trailing_space and tokens
            or vim.list_slice(tokens, 1, #tokens - 1)
        local results = {}
        if #prior == 0 then
            for _, d in ipairs(DIFF_DIRECTIONS) do
                if vim.startswith(d, arg_lead) then
                    table.insert(results, d)
                end
            end
        end
        local first_is_direction = prior[1] == "vertical"
            or prior[1] == "horizontal"
        if #prior == 0 or (#prior == 1 and first_is_direction) then
            vim.list_extend(results, complete_rev(arg_lead))
        end
        return results
    end,
    desc = "Open a diff split",
})
vim.api.nvim_create_user_command("Gedit", function(opts)
    vim.cmd.edit({
        args = { require("git.object").URI_PREFIX .. opts.args },
        magic = { file = false },
    })
end, {
    nargs = 1,
    complete = complete_rev,
    desc = "Edit a git object (<rev>)",
})

vim.api.nvim_create_user_command("Gstatus", function(opts)
    require("git.status_view").open({
        placement = opts.fargs[1] --[[@as ow.Git.StatusView.Placement]]
            or "split",
    })
end, {
    nargs = "?",
    complete = function()
        return require("git.status_view").PLACEMENTS
    end,
    desc = "Open git status view",
})

vim.keymap.set("n", "<Plug>(git-edit)", function()
    local rev = vim.fn.input("Edit git object: ")
    if rev == "" then
        return
    end
    vim.cmd.edit({
        args = { require("git.object").URI_PREFIX .. rev },
        magic = { file = false },
    })
end, { silent = true, desc = "Edit a git object" })

vim.keymap.set("n", "<Plug>(git-diff-vertical)", function()
    require("git.diff").split({ vertical = true })
end, { silent = true, desc = "Diff against index (vertical)" })
vim.keymap.set("n", "<Plug>(git-diff-horizontal)", function()
    require("git.diff").split({ vertical = false })
end, { silent = true, desc = "Diff against index (horizontal)" })
vim.keymap.set("n", "<Plug>(git-diff-vertical-head)", function()
    require("git.diff").split({ rev = "HEAD", vertical = true })
end, { silent = true, desc = "Diff against HEAD (vertical)" })
vim.keymap.set("n", "<Plug>(git-diff-horizontal-head)", function()
    require("git.diff").split({ rev = "HEAD", vertical = false })
end, { silent = true, desc = "Diff against HEAD (horizontal)" })

vim.keymap.set("n", "<Plug>(git-status-toggle)", function()
    require("git.status_view").toggle()
end, { silent = true, desc = "Toggle git status sidebar" })

vim.keymap.set("n", "<Plug>(git-log)", function()
    require("git.log_view").open({ max_count = 1000 })
end, { silent = true, desc = "Open git log" })

vim.keymap.set("n", "<Plug>(git-commit)", function()
    require("git.commit").commit()
end, { silent = true, desc = "Start a git commit" })
vim.keymap.set("n", "<Plug>(git-commit-amend)", function()
    require("git.commit").commit({ args = { "--amend" } })
end, { silent = true, desc = "Amend the last git commit" })

if vim.g.git_statusline ~= false then
    vim.api.nvim_create_autocmd("BufWinEnter", {
        group = group,
        once = true,
        callback = function()
            require("git.statusline")
        end,
    })
end