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 path = vim.api.nvim_buf_get_name(0)
    if path == "" then
        path = vim.fn.getcwd()
    end
    local _, worktree = repo.resolve(path)
    if not worktree then
        log.warning("not in a git repository")
        return
    end

    local result = vim.system({
        "git",
        "log",
        "--graph",
        "--all",
        "--decorate",
        "--date=short",
        "--format=format:" .. LOG_FORMAT,
    }, { cwd = worktree, text = true }):wait()
    if result.code ~= 0 then
        log.error("git log failed: %s", result.stderr or "")
        return
    end

    local lines = util.split_lines(result.stdout or "")

    vim.cmd("new")
    local buf = vim.api.nvim_get_current_buf()
    vim.bo[buf].buftype = "nofile"
    vim.bo[buf].bufhidden = "hide"
    vim.bo[buf].swapfile = false
    vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
    vim.bo[buf].modifiable = false
    vim.bo[buf].modified = false
    vim.b[buf].git_worktree = worktree
    vim.bo[buf].filetype = "gitlog"
end

return M