# pr-merge.ps1 - Merge pull requests on Gitea or GitHub
# Usage: .\pr-merge.ps1 -Number PR_NUMBER [-Method method] [-DeleteBranch]

[CmdletBinding()]
param(
    [Parameter(Mandatory=$true)]
    [Alias("n")]
    [int]$Number,

    [Alias("m")]
    [ValidateSet("merge", "squash", "rebase")]
    [string]$Method = "merge",

    [Alias("d")]
    [switch]$DeleteBranch,

    [Alias("h")]
    [switch]$Help
)

$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
. "$ScriptDir\detect-platform.ps1"

function Show-Usage {
    @"
Usage: pr-merge.ps1 [OPTIONS]

Merge a pull request on the current repository (Gitea or GitHub).

Options:
    -Number, -n NUMBER      PR number to merge (required)
    -Method, -m METHOD      Merge method: merge, squash, rebase (default: merge)
    -DeleteBranch, -d       Delete the head branch after merge
    -Help, -h               Show this help message

Examples:
    .\pr-merge.ps1 -n 42                    # Merge PR #42
    .\pr-merge.ps1 -n 42 -m squash          # Squash merge
    .\pr-merge.ps1 -n 42 -m rebase -d       # Rebase and delete branch
"@
    exit 1
}

if ($Help) {
    Show-Usage
}

$platform = Get-GitPlatform

switch ($platform) {
    "github" {
        $cmd = @("gh", "pr", "merge", $Number)
        switch ($Method) {
            "merge"  { $cmd += "--merge" }
            "squash" { $cmd += "--squash" }
            "rebase" { $cmd += "--rebase" }
        }
        if ($DeleteBranch) { $cmd += "--delete-branch" }
        & $cmd[0] $cmd[1..($cmd.Length-1)]
    }
    "gitea" {
        $cmd = @("tea", "pr", "merge", $Number)
        switch ($Method) {
            "merge"  { $cmd += @("--style", "merge") }
            "squash" { $cmd += @("--style", "squash") }
            "rebase" { $cmd += @("--style", "rebase") }
        }

        if ($DeleteBranch) {
            Write-Warning "Branch deletion after merge may need to be done separately with tea"
        }

        & $cmd[0] $cmd[1..($cmd.Length-1)]
    }
    default {
        Write-Error "Could not detect git platform"
        exit 1
    }
}

Write-Host "PR #$Number merged successfully"