from __future__ import annotations

import re
from uuid import uuid4

from app.copilot.schemas import (
    AiGenerateImageAction,
    AiGenerateImageArguments,
    AiGenerateVideoAction,
    AiGenerateVideoArguments,
    AnalyticsOverviewAction,
    AnalyticsOverviewArguments,
    AnalyticsSyncAction,
    AnalyticsSyncArguments,
    AssetSelectAction,
    AssetSelectArguments,
    ShareProjectAction,
    ShareProjectArguments,
    CopilotContext,
    CopilotPlan,
    EditorAddClipAction,
    EditorAddClipArguments,
    EditorDeleteClipAction,
    EditorDeleteClipArguments,
    EditorRenderAction,
    EditorRenderArguments,
    EditorSetDurationAction,
    EditorSetDurationArguments,
    EditorSplitClipAction,
    EditorSplitClipArguments,
    ProjectOpenAction,
    ProjectOpenArguments,
    PublishingCancelAction,
    PublishingCancelArguments,
    PublishingPublishAction,
    PublishingPublishArguments,
    PublishingValidateAction,
    PublishingValidateArguments,
    TemplateApplyAction,
    TemplateApplyArguments,
    TemplateCreateProjectAction,
    TemplateCreateProjectArguments,
    TemplateGetAction,
    TemplateGetArguments,
    TemplateSearchAction,
    TemplateSearchArguments,
)


class CopilotPlanner:
    """Closed deterministic planner used until a text tool-calling model exists."""

    def plan(self, request: str, context: CopilotContext) -> CopilotPlan:
        normalized = " ".join(request.strip().split())
        lowered = normalized.casefold()
        action_id = str(uuid4())
        project_id = context.project_id
        selected_asset = context.selected_asset_ids[0] if context.selected_asset_ids else None
        selected_clip = context.selected_clip_ids[0] if context.selected_clip_ids else None
        revision = context.editor_summary.revision if context.editor_summary else None

        unavailable = (
            None
            if "template" in lowered
            else self._requested_unavailable_capability(lowered, context)
        )
        if unavailable:
            return self._blocked(
                normalized,
                f"This request requires {unavailable}, but that capability is not available.",
                unsupported=[unavailable],
            )

        template_id = self._template_id(lowered)
        publishing_post_id = self._template_id(lowered)
        if "analytics" in lowered and re.search(r"\b(sync|refresh|update)\b", lowered):
            action = AnalyticsSyncAction(
                id=action_id,
                type="analytics.sync",
                arguments=AnalyticsSyncArguments(project_id=project_id),
                reason="Queue a durable synchronization through authorized provider adapters.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=False,
                required_permission="analytics:sync",
                required_capability="analytics.sync",
            )
            return self._plan(
                "Sync analytics",
                "Queue an idempotent authoritative analytics synchronization.",
                [action],
            )
        if re.search(r"\b(analytics|performance|performing|insights)\b", lowered):
            metric = next(
                (
                    item
                    for item in (
                        "views",
                        "impressions",
                        "likes",
                        "comments",
                        "shares",
                        "engagement_rate",
                    )
                    if item.replace("_", " ") in lowered
                ),
                "views",
            )
            action = AnalyticsOverviewAction(
                id=action_id,
                type="analytics.overview",
                arguments=AnalyticsOverviewArguments(project_id=project_id, metric=metric),
                reason="Read synchronized provider metrics without inferring unavailable values.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="analytics:read",
                required_capability="analytics.overview",
            )
            return self._plan(
                "Review analytics",
                "Read authoritative analytics and report freshness explicitly.",
                [action],
            )
        if publishing_post_id and re.search(r"\b(validate|check)\b.*\b(publish|post)\b", lowered):
            action = PublishingValidateAction(
                id=action_id,
                type="publishing.validate",
                arguments=PublishingValidateArguments(post_id=publishing_post_id),
                reason="Validate the existing canonical post and every selected provider target.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="social:posts:write",
                required_capability="publishing.validate",
            )
            return self._plan(
                "Validate publishing",
                "Run authoritative per-target publishing validation.",
                [action],
            )
        if publishing_post_id and re.search(r"\b(publish|send)\b", lowered):
            action = PublishingPublishAction(
                id=action_id,
                type="publishing.publish",
                arguments=PublishingPublishArguments(post_id=publishing_post_id),
                reason="Publish the explicitly identified canonical post to its already selected accounts.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=True,
                required_permission="social:posts:publish",
                required_capability="publishing.publish",
            )
            return self._plan(
                "Publish social post",
                "Validate and queue external publishing only after explicit confirmation.",
                [action],
            )
        if publishing_post_id and re.search(r"\bcancel\b.*\b(publish|post)\b", lowered):
            action = PublishingCancelAction(
                id=action_id,
                type="publishing.cancel",
                arguments=PublishingCancelArguments(post_id=publishing_post_id),
                reason="Cancel eligible jobs and request cancellation for in-flight provider work.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=True,
                required_permission="social:posts:write",
                required_capability="publishing.cancel",
            )
            return self._plan(
                "Cancel publishing",
                "Apply truthful cancellation semantics after confirmation.",
                [action],
            )
        if "template" in lowered and re.search(r"\b(find|search|browse)\b", lowered):
            query = re.sub(
                r"(?i)\b(find|search|browse|for|me|a|an|template|templates)\b", " ", normalized
            )
            query = " ".join(query.split()) or normalized
            category = next(
                (
                    item
                    for item in (
                        "business",
                        "marketing",
                        "education",
                        "podcast",
                        "gaming",
                        "news",
                        "social",
                        "youtube",
                        "tiktok",
                        "instagram",
                        "product",
                        "personal",
                    )
                    if item in lowered
                ),
                None,
            )
            action = TemplateSearchAction(
                id=action_id,
                type="template.search",
                arguments=TemplateSearchArguments(query=query, category=category),
                reason="Search the authoritative visible template catalog.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="templates:read",
                required_capability="template.search",
            )
            return self._plan(
                "Search templates",
                "Search the versioned marketplace catalog using the current workspace context.",
                [action],
            )

        if "share" in lowered and "project" in lowered and re.search(r"\b(with)\b", lowered):
            # Example parsing for demo purposes
            project_id = "..." # simplified
            user_id = "..." # simplified
            role = "viewer"
            action = ShareProjectAction(
                id=action_id,
                type="project.share",
                arguments=ShareProjectArguments(project_id=project_id, user_id=user_id, role=role),
                reason="Share project with user.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=True,
                required_permission="projects:share",
                required_capability="project.share",
            )
            return self._plan("Share project", "Share project with another user.", [action])

        if template_id and "template" in lowered and re.search(r"\b(open|show|inspect)\b", lowered):
            action = TemplateGetAction(
                id=action_id,
                type="template.get",
                arguments=TemplateGetArguments(template_id=template_id),
                reason="Inspect the selected authoritative template.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="templates:read",
                required_capability="template.get",
            )
            return self._plan("Open template", "Open the selected template.", [action])

        if template_id and "template" in lowered and re.search(r"\b(use|apply)\b", lowered):
            if project_id is None:
                return self._blocked(
                    normalized,
                    "Applying a template requires a selected project.",
                    missing=["project"],
                )
            action = TemplateApplyAction(
                id=action_id,
                type="template.apply",
                arguments=TemplateApplyArguments(
                    template_id=template_id,
                    project_id=project_id,
                    slot_bindings={},
                ),
                reason="Apply the selected versioned template to the current project.",
                requires_confirmation=True,
                destructive=True,
                external_side_effect=False,
                required_permission="templates:apply",
                required_capability="template.apply",
            )
            return self._plan(
                "Apply template",
                "Validate requirements and replace the current authoritative editor state after confirmation.",
                [action],
            )

        if template_id and "template" in lowered and "create project" in lowered:
            name_match = re.search(r'\bnamed\s+["“]?([^"”]+?)["”]?\s*$', normalized, re.IGNORECASE)
            if name_match is None:
                return self._blocked(
                    normalized,
                    "Creating a project from a template requires an explicit project name.",
                    missing=["project name"],
                )
            action = TemplateCreateProjectAction(
                id=action_id,
                type="template.create_project",
                arguments=TemplateCreateProjectArguments(
                    template_id=template_id,
                    project_name=name_match.group(1).strip(),
                    slot_bindings={},
                ),
                reason="Create an editable project from the selected template.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=False,
                required_permission="templates:apply",
                required_capability="template.create_project",
            )
            return self._plan(
                "Create project from template",
                "Validate requirements and create a new editable project after confirmation.",
                [action],
            )

        if re.search(r"\b(open|show)\b.*\bproject\b", lowered):
            if project_id is None:
                return self._blocked(normalized, "Select a project first.", missing=["project"])
            action = ProjectOpenAction(
                id=action_id,
                type="project.open",
                arguments=ProjectOpenArguments(project_id=project_id),
                reason="Open the selected project.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="projects:read",
                required_capability="project.open",
            )
            return self._plan("Open project", "Open the selected project.", [action])

        if re.search(r"\b(open|select|show)\b.*\basset\b", lowered):
            if selected_asset is None:
                return self._blocked(normalized, "Select an asset first.", missing=["asset"])
            action = AssetSelectAction(
                id=action_id,
                type="asset.select",
                arguments=AssetSelectArguments(asset_id=selected_asset, project_id=project_id),
                reason="Open the selected canonical asset.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="assets:read",
                required_capability="asset.select",
            )
            return self._plan("Open asset", "Open the selected asset.", [action])

        if "generate" in lowered and ("video" in lowered or "animate" in lowered):
            if "ai.generate_video" not in context.available_capabilities:
                return self._blocked(
                    normalized,
                    "Video generation is not currently available.",
                    unsupported=["ai.generate_video"],
                )
            if selected_asset is None:
                return self._blocked(
                    normalized,
                    "Video generation requires a selected source image.",
                    missing=["source image asset"],
                )
            prompt = self._generation_prompt(normalized, "video")
            action = AiGenerateVideoAction(
                id=action_id,
                type="ai.generate_video",
                arguments=AiGenerateVideoArguments(
                    prompt=prompt,
                    project_id=project_id,
                    source_asset_id=selected_asset,
                ),
                reason="Submit a real image-to-video generation job.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=False,
                required_permission="ai:generate",
                required_capability="ai.generate_video",
            )
            return self._plan(
                "Generate video",
                "Generate a video from the selected image using AI Studio.",
                [action],
            )

        if "generate" in lowered and any(
            word in lowered for word in ("image", "thumbnail", "artwork")
        ):
            if "ai.generate_image" not in context.available_capabilities:
                return self._blocked(
                    normalized,
                    "Image generation is not currently available.",
                    unsupported=["ai.generate_image"],
                )
            prompt = self._generation_prompt(normalized, "image")
            action = AiGenerateImageAction(
                id=action_id,
                type="ai.generate_image",
                arguments=AiGenerateImageArguments(
                    prompt=prompt,
                    project_id=project_id,
                    source_asset_id=selected_asset,
                ),
                reason="Submit a real image generation job.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=False,
                required_permission="ai:generate",
                required_capability="ai.generate_image",
            )
            return self._plan(
                "Generate image",
                "Generate an image using the currently available AI Studio model.",
                [action],
            )

        if re.search(r"\b(render|export)\b", lowered):
            if project_id is None or revision is None:
                return self._blocked(
                    normalized,
                    "Rendering requires a project with saved editor state.",
                    missing=["saved editor state"],
                )
            action = EditorRenderAction(
                id=action_id,
                type="editor.render",
                arguments=EditorRenderArguments(project_id=project_id, expected_revision=revision),
                reason="Submit the current authoritative editor revision for rendering.",
                requires_confirmation=True,
                destructive=False,
                external_side_effect=False,
                required_permission="projects:update",
                required_capability="editor.render",
            )
            return self._plan(
                "Render project",
                "Validate and submit the current editor revision to the existing render pipeline.",
                [action],
            )

        split_match = re.search(
            r"\bsplit\b.*?\b(?:at\s+)?(\d+(?:\.\d+)?)\s*(seconds?|secs?|s)\b",
            lowered,
        )
        if split_match:
            missing = self._editor_missing(project_id, revision, selected_clip)
            if missing:
                return self._blocked(
                    normalized, "Select a saved timeline clip first.", missing=missing
                )
            action = EditorSplitClipAction(
                id=action_id,
                type="editor.split_clip",
                arguments=EditorSplitClipArguments(
                    project_id=project_id,
                    clip_id=selected_clip,
                    at_ms=round(float(split_match.group(1)) * 1_000),
                    expected_revision=revision,
                ),
                reason="Split the selected clip at the requested timeline time.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="projects:update",
                required_capability="editor.split_clip",
            )
            return self._plan(
                "Split selected clip",
                "Save a revision-safe split through the authoritative editor service.",
                [action],
            )

        if re.search(r"\b(delete|remove)\b.*\b(selected\s+)?clip\b", lowered):
            missing = self._editor_missing(project_id, revision, selected_clip)
            if missing:
                return self._blocked(
                    normalized, "Select a saved timeline clip first.", missing=missing
                )
            action = EditorDeleteClipAction(
                id=action_id,
                type="editor.delete_clip",
                arguments=EditorDeleteClipArguments(
                    project_id=project_id,
                    clip_id=selected_clip,
                    expected_revision=revision,
                ),
                reason="Remove the selected clip from the authoritative timeline.",
                requires_confirmation=True,
                destructive=True,
                external_side_effect=False,
                required_permission="projects:update",
                required_capability="editor.delete_clip",
            )
            return self._plan(
                "Delete selected clip",
                "Delete the selected clip after explicit confirmation.",
                [action],
            )

        duration_match = re.search(
            r"\b(?:last|duration|make)\b.*?(\d+(?:\.\d+)?)\s*(seconds?|secs?|s)\b",
            lowered,
        )
        if duration_match and ("clip" in lowered or "image" in lowered):
            missing = self._editor_missing(project_id, revision, selected_clip)
            if missing:
                return self._blocked(
                    normalized, "Select a saved timeline clip first.", missing=missing
                )
            action = EditorSetDurationAction(
                id=action_id,
                type="editor.set_duration",
                arguments=EditorSetDurationArguments(
                    project_id=project_id,
                    clip_id=selected_clip,
                    duration_ms=round(float(duration_match.group(1)) * 1_000),
                    expected_revision=revision,
                ),
                reason="Set the selected clip duration.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="projects:update",
                required_capability="editor.set_duration",
            )
            return self._plan(
                "Update clip duration",
                "Save the requested duration through the authoritative editor service.",
                [action],
            )

        if re.search(r"\badd\b.*\b(asset|image|video|audio)\b.*\b(timeline|editor)\b", lowered):
            if project_id is None or revision is None or selected_asset is None:
                return self._blocked(
                    normalized,
                    "Adding media requires a project, saved editor state, and selected asset.",
                    missing=["project", "saved editor state", "asset"],
                )
            action = EditorAddClipAction(
                id=action_id,
                type="editor.add_clip",
                arguments=EditorAddClipArguments(
                    project_id=project_id,
                    asset_id=selected_asset,
                    expected_revision=revision,
                ),
                reason="Add the selected canonical asset to the timeline.",
                requires_confirmation=False,
                destructive=False,
                external_side_effect=False,
                required_permission="projects:update",
                required_capability="editor.add_clip",
            )
            return self._plan(
                "Add asset to timeline",
                "Insert the selected project asset through the authoritative editor service.",
                [action],
            )

        return self._blocked(
            normalized,
            "This request does not map to a currently registered Copilot action.",
            unsupported=["natural-language intent"],
        )

    @staticmethod
    def _editor_missing(project_id, revision, selected_clip) -> list[str]:
        missing = []
        if project_id is None:
            missing.append("project")
        if revision is None:
            missing.append("saved editor state")
        if selected_clip is None:
            missing.append("selected clip")
        return missing

    @staticmethod
    def _generation_prompt(request: str, media_word: str) -> str:
        stripped = re.sub(
            rf"(?i)^\s*(please\s+)?generate\s+(an?\s+)?{media_word}\s*(of|for|with|:)?\s*",
            "",
            request,
        ).strip()
        return stripped or request

    @staticmethod
    def _template_id(request: str) -> str | None:
        match = re.search(
            r"\b[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}\b",
            request,
            re.IGNORECASE,
        )
        return match.group(0) if match else None

    @staticmethod
    def _requested_unavailable_capability(request: str, context: CopilotContext) -> str | None:
        requested = {
            "transcrib": "ai.transcribe",
            "upscal": "ai.upscale",
            "remove background": "ai.remove_background",
            "voice": "ai.generate_voice",
            "music": "ai.generate_music",
            "caption": "ai.transcribe",
            "tiktok": "ai.transcribe",
            "highlight": "ai.analyze",
        }
        for fragment, capability in requested.items():
            if fragment in request and capability not in context.available_capabilities:
                return capability
        return None

    @staticmethod
    def _plan(intent: str, explanation: str, actions: list) -> CopilotPlan:
        return CopilotPlan(
            intent=intent,
            explanation=explanation,
            actions=actions,
            executable=True,
            requires_confirmation=any(action.requires_confirmation for action in actions),
        )

    @staticmethod
    def _blocked(
        intent: str,
        explanation: str,
        *,
        missing: list[str] | None = None,
        unsupported: list[str] | None = None,
    ) -> CopilotPlan:
        return CopilotPlan(
            intent=intent[:200],
            explanation=explanation,
            actions=[],
            missing_information=missing or [],
            unsupported_capabilities=unsupported or [],
            executable=False,
            requires_confirmation=False,
        )