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

local M = {}

local LOG_FORMAT = "%h %ad {%an}%d %s"
local DEFAULT_MAX_COUNT = 1000

---@class ow.Git.LogOpts
---@field max_count integer?  cap on commits to show. Nil uses the default, <= 0 means "all"

---@param opts ow.Git.LogOpts?
function M.open(opts)
    opts = opts or {}
    local max_count = opts.max_count
    if max_count == nil then
        max_count = DEFAULT_MAX_COUNT
    end

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

    local cmd = {
        "git",
        "log",
        "--graph",
        "--all",
        "--decorate",
        "--date=short",
        "--format=format:" .. LOG_FORMAT,
    }
    if max_count > 0 then
        table.insert(cmd, "--max-count=" .. max_count)
    end

    local stdout = util.exec(cmd, { cwd = worktree })
    if not stdout then
        return
    end

    -- `hide` keeps the log around when the user navigates into a commit
    -- via `<CR>` (which replaces the current buffer); `<C-^>` jumps back.
    local buf = util.new_scratch({ bufhidden = "hide" })
    vim.b[buf].git_worktree = worktree
    vim.bo[buf].modifiable = true
    vim.api.nvim_buf_set_lines(buf, 0, -1, false, util.split_lines(stdout))
    vim.bo[buf].modifiable = false
    vim.bo[buf].modified = false
    vim.bo[buf].filetype = "gitlog"
end

return M