local git = require("git")
local log = require("log")
local repo = require("git.repo")
local util = require("util")

local M = {}

local LOG_FORMAT = "%h %ad {%an}%d %s"

function M.show()
    local _, worktree = repo.resolve_cwd()
    if not worktree then
        log.warning("not in a git repository")
        return
    end

    local buf = git.new_scratch()
    vim.b[buf].git_worktree = worktree

    vim.system(
        {
            "git",
            "log",
            "--graph",
            "--all",
            "--decorate",
            "--date=short",
            "--format=format:" .. LOG_FORMAT,
        },
        { cwd = worktree, text = true },
        vim.schedule_wrap(function(result)
            if not vim.api.nvim_buf_is_valid(buf) then
                return
            end
            if result.code ~= 0 then
                log.error("git log failed: %s", vim.trim(result.stderr or ""))
                return
            end
            local lines = util.split_lines(result.stdout or "")
            vim.bo[buf].modifiable = true
            vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
            vim.bo[buf].modifiable = false
            vim.bo[buf].modified = false
            vim.bo[buf].filetype = "gitlog"
        end)
    )
end

return M