-------------------------------------------------------------------------------
--     - Fugitive.vim extensions library -
-------------------------------------------------------------------------------

-- Generates url for creating PR for current branch
-- Tested only with github.com
-- Works regardless of ssh or https for origin config
-- Hardcoded to use 'origin' remote
local function get_pr_url(...)
	local origin_url = vim.fn['fugitive#RemoteUrl']('origin')
	origin_url = string.gsub(origin_url, '.git$', '')
	origin_url = string.gsub(origin_url, ':', '/')
	origin_url = string.gsub(origin_url, 'git@', 'https://')

	-- Remove prefix if it is available, for some of common git services
	local common_services = {'github.com', 'bitbucket.org', 'gitlab.com'}
	for k,service in pairs(common_services) do
		if (string.find(origin_url, service, 1, true))
			then
			-- Common mechanism for managing multiple SSH keys
			origin_url = string.gsub(origin_url, '://.*' .. service, '://' .. service)
		end
	end

	-- This part probably only works on github
	local pr_url
	if (select('#', ...) == 0)
		then
		pr_url = origin_url .. '/compare/' .. vim.fn.FugitiveHead() .. '?expand=1'
	else
		pr_url = origin_url .. '/compare/' .. select(1, ...) .. '...' .. vim.fn.FugitiveHead() .. '?expand=1'
	end
	return pr_url
end

-------------------------------------------------------------------------------
--    - Public API -
-------------------------------------------------------------------------------

local M = {}

-- Shorcut to push directly to current branch on origin
-- Similar to `ggpush` in fish config
function M.push_origin()
	vim.cmd('Git push origin ' .. vim.fn.FugitiveHead())
end

-- Shorcut to pull directly from current branch on origin
-- Similar to `ggpull` in fish config
function M.pull_origin()
	vim.cmd('Git pull origin ' .. vim.fn.FugitiveHead())
end


-- Prints current branches PR url (not saved to :messages)
-- Makes it easy to use terminal for opening url on click
function M.print_pr_url(...)
	vim.cmd('echo "' .. get_pr_url(...) .. '"')
end

-- Copies current branches PR url to system clipboard
function M.copy_pr_url(...)
	vim.cmd('let @+ = "' .. get_pr_url(...) .. '"')
end

-- Opens current banches PR url in default browser
-- Utilizes netrw browse, meaning it should behave same as netrw
function M.open_new_pr(...)
	vim.fn['netrw#BrowseX'](get_pr_url(...), 0)
end

-- Creates new branch and checks out to it
-- Similar to `gcb` in fish config
function M.create_branch(branch)
	vim.cmd('Git checkout -b ' .. branch)
end

-- Switches to branch
function M.checkout_branch(branch)
	vim.cmd('Git checkout ' .. branch)
end

return M