#!/bin/bash
# detect-platform.sh - Detect git platform (Gitea or GitHub) for current repo
# Usage: source detect-platform.sh && detect_platform
#        or: ./detect-platform.sh (prints platform name)

detect_platform() {
    local remote_url
    remote_url=$(git remote get-url origin 2>/dev/null)

    if [[ -z "$remote_url" ]]; then
        echo "error: not a git repository or no origin remote" >&2
        return 1
    fi

    # Check for GitHub
    if [[ "$remote_url" == *"github.com"* ]]; then
        PLATFORM="github"
        export PLATFORM
        echo "github"
        return 0
    fi

    # Check for common Gitea indicators
    # Gitea URLs typically don't contain github.com, gitlab.com, bitbucket.org
    if [[ "$remote_url" != *"gitlab.com"* ]] && \
       [[ "$remote_url" != *"bitbucket.org"* ]]; then
        # Assume Gitea for self-hosted repos
        PLATFORM="gitea"
        export PLATFORM
        echo "gitea"
        return 0
    fi

    PLATFORM="unknown"
    export PLATFORM
    echo "unknown"
    return 1
}

get_repo_info() {
    local remote_url
    remote_url=$(git remote get-url origin 2>/dev/null)

    if [[ -z "$remote_url" ]]; then
        echo "error: not a git repository or no origin remote" >&2
        return 1
    fi

    # Extract owner/repo from URL
    # Handles: git@host:owner/repo.git, https://host/owner/repo.git, https://host/owner/repo
    local repo_path
    if [[ "$remote_url" == git@* ]]; then
        repo_path="${remote_url#*:}"
    else
        repo_path="${remote_url#*://}"
        repo_path="${repo_path#*/}"
    fi

    # Remove .git suffix if present
    repo_path="${repo_path%.git}"

    echo "$repo_path"
}

get_repo_owner() {
    local repo_info
    repo_info=$(get_repo_info)
    echo "${repo_info%%/*}"
}

get_repo_name() {
    local repo_info
    repo_info=$(get_repo_info)
    echo "${repo_info##*/}"
}

get_remote_host() {
    local remote_url
    remote_url=$(git remote get-url origin 2>/dev/null || true)
    if [[ -z "$remote_url" ]]; then
        return 1
    fi
    if [[ "$remote_url" =~ ^https?://([^/]+)/ ]]; then
        echo "${BASH_REMATCH[1]}"
        return 0
    fi
    if [[ "$remote_url" =~ ^git@([^:]+): ]]; then
        echo "${BASH_REMATCH[1]}"
        return 0
    fi
    return 1
}

# Resolve a Gitea API token for the given host.
# Priority: Mosaic credential loader → GITEA_TOKEN env → ~/.git-credentials
get_gitea_token() {
    local host="$1"
    local script_dir
    script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
    local cred_loader="$script_dir/../_lib/credentials.sh"

    # 1. Mosaic credential loader (host → service mapping, run in subshell to avoid polluting env)
    if [[ -f "$cred_loader" ]]; then
        local token
        token=$(
            source "$cred_loader"
            case "$host" in
                git.mosaicstack.dev) load_credentials gitea-mosaicstack 2>/dev/null ;;
                git.uscllc.com)      load_credentials gitea-usc 2>/dev/null ;;
                *)
                    for svc in gitea-mosaicstack gitea-usc; do
                        load_credentials "$svc" 2>/dev/null || continue
                        [[ "${GITEA_URL:-}" == *"$host"* ]] && break
                        unset GITEA_TOKEN GITEA_URL
                    done
                    ;;
            esac
            echo "${GITEA_TOKEN:-}"
        )
        if [[ -n "$token" ]]; then
            echo "$token"
            return 0
        fi
    fi

    # 2. GITEA_TOKEN env var (may be set by caller)
    if [[ -n "${GITEA_TOKEN:-}" ]]; then
        echo "$GITEA_TOKEN"
        return 0
    fi

    # 3. ~/.git-credentials file
    local creds="$HOME/.git-credentials"
    if [[ -f "$creds" ]]; then
        local token
        token=$(grep -F "$host" "$creds" 2>/dev/null | sed -n 's#https\?://[^@]*:\([^@/]*\)@.*#\1#p' | head -n 1)
        if [[ -n "$token" ]]; then
            echo "$token"
            return 0
        fi
    fi

    return 1
}

# If script is run directly (not sourced), output the platform
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
    detect_platform
fi