"""Formatage et affichage Rich du dashboard Gitea."""

from __future__ import annotations

from datetime import datetime, timezone

from rich.console import Console
from rich.table import Table

from gitea_dashboard.collector import RepoData


def _format_repo_name(repo: RepoData) -> str:
    """Formate le nom du repo avec les indicateurs visuels."""
    indicators = []
    if repo.is_fork:
        indicators.append("[F]")
    if repo.is_archived:
        indicators.append("[A]")
    if repo.is_mirror:
        indicators.append("[M]")

    if indicators:
        return f"{repo.name} {' '.join(indicators)}"
    return repo.name


def _format_relative_date(iso_date: str) -> str:
    """Convertit une date ISO en date relative lisible."""
    try:
        dt = datetime.fromisoformat(iso_date.replace("Z", "+00:00"))
    except (ValueError, AttributeError):
        return ""

    now = datetime.now(timezone.utc)
    delta = now - dt

    days = delta.days
    if days < 0:
        return "dans le futur"
    if days == 0:
        return "aujourd'hui"
    if days == 1:
        return "il y a 1j"
    if days < 30:
        return f"il y a {days}j"
    months = days // 30
    if months < 12:
        return f"il y a {months}m"
    years = days // 365
    return f"il y a {years}a"


def _format_release(release: dict | None) -> str:
    """Formate la release pour l'affichage."""
    if release is None:
        return "\u2014"

    tag = release.get("tag_name", "")
    published = release.get("published_at", "")

    if published:
        relative = _format_relative_date(published)
        if relative:
            return f"{tag} ({relative})"

    return tag


def _colorize_milestone_due(due_on: str | None) -> str:
    """Retourne le style Rich selon la proximite de l'echeance.

    - Rouge : echeance depassee
    - Jaune : echeance dans les 7 prochains jours
    - Vert : echeance dans plus de 7 jours
    - Chaine vide : pas d'echeance definie
    """
    if not due_on:
        return ""
    try:
        dt = datetime.fromisoformat(due_on.replace("Z", "+00:00"))
    except (ValueError, AttributeError):
        return ""

    now = datetime.now(timezone.utc)
    delta = dt - now
    days = delta.days

    if days < 0:
        return "red"
    if days < 7:
        return "yellow"
    return "green"


def sort_repos(repos: list[RepoData], sort_key: str) -> list[RepoData]:
    """Trie la liste des repos selon le critere donne.

    Args:
        repos: Liste des repos a trier.
        sort_key: Critere de tri parmi :
            - "name" : alphabetique par nom (defaut)
            - "issues" : par nombre d'issues ouvertes (decroissant)
            - "release" : par date de derniere release (plus recent d'abord)
            - "activity" : par date du dernier commit (plus recent d'abord)
    """
    if sort_key == "name":
        return sorted(repos, key=lambda r: r.name.lower())
    if sort_key == "issues":
        return sorted(repos, key=lambda r: r.open_issues, reverse=True)
    if sort_key == "release":
        # Repos sans release en dernier (date vide = epoch 0)
        def release_date(r: RepoData) -> str:
            if r.latest_release and r.latest_release.get("published_at"):
                return r.latest_release["published_at"]
            return ""

        return sorted(repos, key=release_date, reverse=True)
    if sort_key == "activity":
        # Repos sans commit en dernier (date vide = epoch 0)
        return sorted(repos, key=lambda r: r.last_commit_date or "", reverse=True)
    return repos


def render_dashboard(
    repos: list[RepoData],
    console: Console | None = None,
    sort_key: str = "name",
) -> None:
    """Affiche le dashboard complet dans le terminal.

    - Tableau principal : nom repo, indicateurs (fork/archive/mirror),
      issues ouvertes, derniere release (tag + date relative)
    - Section milestones : par repo ayant des milestones,
      nom, progression (closed/total), date echeance

    Le parametre console permet l'injection pour les tests.
    """
    if console is None:
        console = Console()

    if not repos:
        console.print("Aucun repo trouve.")
        return

    # Tri des repos
    sorted_repos = sort_repos(repos, sort_key)

    # Tableau principal
    table = Table(title="Gitea Dashboard")
    table.add_column("Repo", style="bold")
    table.add_column("Issues", justify="right")
    table.add_column("Release")
    table.add_column("Dernier commit")

    for repo in sorted_repos:
        name = _format_repo_name(repo)
        issues_str = str(repo.open_issues)
        issues_style = "red" if repo.open_issues > 0 else "green"
        release_str = _format_release(repo.latest_release)
        commit_str = (
            _format_relative_date(repo.last_commit_date) if repo.last_commit_date else "\u2014"
        )

        table.add_row(
            name,
            f"[{issues_style}]{issues_str}[/{issues_style}]",
            release_str,
            commit_str,
        )

    console.print(table)

    # Section milestones — uniquement si au moins un repo en a
    repos_with_milestones = [r for r in sorted_repos if r.milestones]

    if repos_with_milestones:
        console.print()
        console.print("[bold]Milestones[/bold]")

        for repo in repos_with_milestones:
            for ms in repo.milestones:
                title = ms["title"]
                closed = ms["closed_issues"]
                total = ms["open_issues"] + ms["closed_issues"]
                pct = round(closed / total * 100) if total > 0 else 0

                line = f"  {repo.name} / {title} : {closed}/{total} ({pct}%)"

                due_on = ms.get("due_on")
                if due_on:
                    # Extraire juste la date (YYYY-MM-DD)
                    try:
                        dt = datetime.fromisoformat(due_on.replace("Z", "+00:00"))
                        line += f" \u2014 echeance {dt.strftime('%Y-%m-%d')}"
                    except (ValueError, AttributeError):
                        pass

                # Coloration selon la proximite de l'echeance
                style = _colorize_milestone_due(due_on)
                if style:
                    console.print(f"[{style}]{line}[/{style}]")
                else:
                    console.print(line)